WO2016161558A1

WO2016161558A1 - Network device, user equipment and downlink data transmission method

Info

Publication number: WO2016161558A1
Application number: PCT/CN2015/075997
Authority: WO
Inventors: 常俊仁; 冯淑兰; 张兴炜
Original assignee: 华为技术有限公司
Priority date: 2015-04-07
Filing date: 2015-04-07
Publication date: 2016-10-13
Also published as: CN107211394A; CN107211394B

Abstract

The present invention relates to a wireless communication technology, and in particular, to a network device, a user equipment (UE) and a downlink data transmission method, which are used to solve the problem of over-large delay of some data packets transmitted on an unlicensed spectrum in a license assisted access (LAA) system. In the network device provided by embodiments of the present invention, a transceiving module is configured to initially transmit, by means of a hybrid automatic repeat request (HARQ) process Y of an unlicensed cell (U-cell), downlink data to a user equipment (UE); a processing module is configured to determine that the downlink data is repeated by means of a licensed cell (L-cell); and the transceiving module is further configured to repeat, by means of the L-cell, the downlink data to the UE. Thus, the problem of over-large delay of some data packets transmitted on an unlicensed spectrum caused by shortage of resources on the unlicensed spectrum is avoided.

Description

Network device, user equipment, and downlink data transmission method

Technical field

The present invention relates to wireless communication technologies, and in particular, to a network device, a user equipment, and a downlink data transmission method.

Background technique

Spectrum management is a spectrum planning method established to effectively utilize radio frequencies. At present, in the spectrum management, a part of the spectrum is licensed to a certain mobile communication system, such as a Universal Mobility Telecommunications Service (UMTS) or a Long Term Evolution (LTE) system. For the "licensed spectrum", the carrier corresponding to the licensed spectrum is also commonly referred to as the "licensed carrier".

In addition, some spectrums are allocated for use by unauthorized wireless communication devices, such as Wireless Fidelity (WiFi) devices. Different wireless communication devices can share the use of the frequency resource. This spectrum is called "unlicensed spectrum", and the carrier corresponding to the unlicensed spectrum is usually called "unlicensed carrier". At present, the unlicensed spectrum mainly includes: 2.4 GHz to 2.4835 GHz, and 5.725 GHz to 5.850 GHz.

At present, the frequency band utilization rate of the unlicensed spectrum is relatively low, and the user's service demand for the mobile communication system is increasing. Therefore, more spectrum resources are needed in the mobile communication system to meet the user's service requirements. For example: mobile communication system operators want to be able to deploy Third Generation Partnership Project ^{(3 rd Generation Partner Project, 3GPP} ) mobile communication system network network specifications, such as LTE systems in the unlicensed spectrum, and thus licensed spectrum Combined to provide services to users.

Generally, an LTE system that uses an unlicensed spectrum is called an LTE-Unlicensed (LTE-U) or (Unlicensed LTE, U-LTE) system; or an authorized carrier-assisted access (License Assisted Access, LAA) system.

At present, the flow chart of the downlink HARQ process in the LTE system is shown in FIG. 1 . First, the LTE system The base station eNodeB (eNB) transmits the downlink data on the physical downlink shared channel (PDSCH) in the subframe 3, and the user equipment (User Equipment, UE) listens to the downlink data. Decoding, if the decoding fails, in the subframe 7, the NACK information is fed back to the eNB on the PUCCH; the eNB demodulates and processes the NACK information in the PUCCH, and then schedules the retransmission data according to the downlink resource allocation situation. The scheduling time is not specified, and the eNB may schedule according to the situation. Here, it is assumed that the eNB retransmits on the PDSCH in the subframe 9. If the UE successfully decodes, the ACK is sent in the subframe 2 of the next radio frame; thus, one downlink data transmission is performed. ended.

Currently, the initial transmission or retransmission of a Cell's HARQ process is performed on the HARQ entity corresponding to the Cell. If this method is also adopted in the LAA system, since the resources on the unlicensed spectrum are sometimes absent, the delay of some data packets transmitted on the unlicensed spectrum may be too large.

Summary of the invention

The embodiments of the present invention provide a network device, a user equipment, and a downlink data transmission method, which are used to solve the problem that a part of a data packet transmitted on an unlicensed spectrum is excessively delayed in an LAA system.

In a first aspect, an embodiment of the present invention provides a network device, including:

a transceiver module, configured to perform initial transmission of downlink data to the user equipment UE by using a hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

a processing module, configured to determine that the retransmission mode of the downlink data is retransmission by using an authorized cell L-Cell;

The transceiver module is further configured to: perform retransmission of the downlink data to the UE by using the L-Cell.

In conjunction with the first aspect, in a first possible implementation, the transceiver module is further configured to:

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell transmission configuration information to the UE before performing retransmission of the downlink data to the UE, where the cross-HARQ entity/cross-cell transmission configuration information is used for And indicating that the downlink data of the UE is retransmitted by using an L-Cell.

In combination with the first aspect, in a second possible implementation manner,

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset.

In combination with the first aspect, in a third possible implementation,

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, and the L-Cell is a primary cell PCell that communicates with the UE.

With reference to any one of the first possible implementation of the first aspect to the third possible implementation, in a fourth possible implementation, the transceiver module is further configured to:

After performing initial transmission of downlink data to the UE through the HARQ process Y of the U-Cell, transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE, the cross-HARQ entity/ Trans-cell retransmission scheduling signaling is used to instruct the UE to receive retransmission of the downlink data from the L-Cell;

The transceiver module is specifically configured to:

Retransmitting the downlink data to the UE on the downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

Retransmitted indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.

In conjunction with the fourth or fifth possible implementation of the first aspect, in a sixth possible implementation, the transceiver module is further configured to:

Transmitting the cross-carrier scheduling signaling to the UE by using the U-Cell, before the initial transmission of the downlink data to the UE by the HARQ process Y of the U-Cell, where the cross-carrier scheduling signaling is used to indicate the Receiving, by the UE, an initial transmission of the downlink data from a HARQ process Y on the U-Cell;

The transceiver module is specifically configured to: perform initial transmission of the downlink data to the UE on a downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling.

With reference to the sixth possible implementation manner of the foregoing aspect, in a seventh possible implementation, the cross-carrier scheduling signaling includes:

Initial transmission indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.

With reference to the first aspect, or any one of the first possible implementation to the seventh possible implementation of the first aspect, in an eighth possible implementation,

The transceiver module is further configured to: after the transceiver module performs retransmission of the downlink data to the UE by using the L-Cell,

Before determining that the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, the feedback information for the retransmission of the downlink data sent by the UE is not received;

After determining that the timing synchronization timer TAT of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, waiting for receiving the weight of the downlink data sent by the UE Feedback information.

In a second aspect, an embodiment of the present invention provides a network device, including:

a transceiver module, configured to perform downlink data transmission to the user equipment UE by using a hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

a processing module, configured to determine, on the U-Cell, that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data, and determining to perform the downlink data to the UE by using an authorized cell L-Cell Transmission

In combination with the second aspect, in a first possible implementation manner,

The processing module is specifically configured to: determine, by using the L-Cell, initial transmission and retransmission of the downlink data to the UE

The transceiver module is specifically configured to: perform initial transmission and retransmission of the downlink data to the UE by using the L-Cell.

In conjunction with the first possible implementation of the second aspect, in a second possible implementation, the transceiver module is specifically configured to:

Performing initial transmission and retransmission of the downlink data to the UE through the HARQ process Y of the U-Cell.

In conjunction with the first or second possible implementation of the second aspect, in a third possible implementation,

The transceiver module is further configured to: before performing initial transmission and retransmission of the downlink data to the UE by using an L-Cell,

Transmitting, by the UE, cross-HARQ entity/cross-cell transmission configuration information, where the cross-HARQ entity/cross-cell transmission configuration information is used to indicate that the UE has no or lack of scheduling for the UE transmission on the U-Cell When the downlink resource of the downlink data is available, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data.

In conjunction with the first or second possible implementation of the second aspect, in a fourth possible implementation,

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission method is preset.

In conjunction with the first or second possible implementation of the second aspect, in a fifth possible implementation,

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission mode is preset, and the L-Cell is a primary cell PCell that communicates with the UE.

With reference to any one of the third to fifth possible implementation manners of the second aspect, in a sixth possible implementation, the transceiver module is further configured to: determine, by the processing module, that the authorized cell L -Cell, after the initial transmission and retransmission of the downlink data to the UE, before the initial transmission and retransmission of the downlink data by the transceiver module to the UE by using the L-Cell

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, sending a first resource status indication message to the UE, where the first resource status indication message is used to indicate The UE:

There is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell; or

After the first effective time length, there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.

With reference to the sixth possible implementation of the second aspect, in a seventh possible implementation, the transceiver module is further configured to:

And when the U-Cell is configured to send the second downlink resource status indication message to the UE, where the second resource status indication message is used to indicate that the UE is configured to transmit the downlink data. UE:

An available downlink resource for scheduling the UE to transmit the downlink data exists on the U-Cell; or

Within the second effective time length, there are available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.

In combination with the second aspect, in an eighth possible implementation,

The transceiver module is specifically configured to: when retransmitting the downlink data to the UE by using the L-Cell:

Retransmitting the downlink data to the UE by using the L-Cell.

In conjunction with the eighth possible implementation of the second aspect, in a ninth possible implementation, the transceiver module is specifically configured to:

Retransmitting the downlink data to the UE by using the HARQ process X of the L-Cell.

With reference to the ninth possible implementation of the second aspect, in a tenth possible implementation, the transceiver module is further configured to: perform the downlink data to the UE by using an HARQ process X of the L-Cell Before the retransmission,

And transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, where the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE has no or lack of scheduling on the U-Cell. When the UE transmits the available downlink resources of the downlink data, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.

With reference to the ninth possible implementation manner of the second aspect, in an eleventh possible implementation manner,

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink The transmission method of data retransmission is preset.

In conjunction with the ninth possible implementation of the second aspect, in a twelfth possible implementation,

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink The transmission mode of retransmission of data is preset; the L-Cell is a primary cell PCell that communicates with the UE.

With reference to any one of the tenth to twelfth possible implementation manners of the second aspect, in the thirteenth possible implementation manner, the transceiver module is further configured to: in the HARQ process Y through the U-Cell After transmitting downlink data to the UE,

Transmitting the HARQ entity/cross-cell retransmission scheduling signaling to the UE by using the L-Cell, where the cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the HARQ process X is used to indicate that the UE performs the retransmission transmission mode of the downlink data according to the HARQ process X of the L-Cell instead of the HARQ process Y of the U-Cell, and the cross The retransmission data of the downlink data scheduled by the HARQ entity/cross-cell retransmission scheduling signaling is merged with the downlink data on the HARQ process Y of the U-Cell;

The transceiver module is specifically configured to perform retransmission of the downlink data to the UE on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.

In conjunction with the eighth possible implementation of the second aspect, in the fourteenth possible implementation manner,

The transceiver module is further configured to: before the retransmission of the downlink data to the UE by using the L-Cell,

And transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, where the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE: the L-Cell replaces the U-Cell Retransmission of downlink data.

In conjunction with the eighth possible implementation of the second aspect, in the fifteenth possible implementation manner,

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. default.

With reference to the eighth possible implementation of the second aspect, in the sixteenth possible implementation manner,

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. Preset; the L-Cell is a primary cell PCell that communicates with the UE.

In combination with any one of the fourteenth to sixteenth possible implementations of the second aspect, in the seventeenth possible implementation,

The transceiver module is further configured to: after the downlink data transmission to the UE by using the HARQ process Y of the U-Cell:

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE, where the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to indicate that the UE is from the L-Cell Receiving retransmission of the downlink data;

In conjunction with the seventeenth possible implementation of the second aspect, in the eighteenth possible implementation,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE from Retransmitting the downlink data on a cell using an unlicensed spectrum that communicates with the UE on a cell that uses the licensed spectrum that is communicated by the UE;

The identifier of the U-Cell;

The identifier of the HARQ process Y.

In conjunction with any one of the fourteenth to eighteenth possible implementations of the second aspect, in a nineteenth possible implementation,

The identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are independently allocated.

In conjunction with the eighth possible implementation of the second aspect, in a twentieth possible implementation,

Sending U-Cell configuration information to the UE, where the U-Cell configuration information includes:

The HARQ process identifier that the UE can use on the U-Cell; or

a range of HARQ process identifiers that the UE can use on the U-Cell; or

The initial HARQ process identifier in the HARQ process identifier that the UE can use on the U-Cell.

With the twentieth possible implementation of the second aspect, in the twenty-first possible implementation, the transceiver module is further configured to: perform downlink data to the UE in the HARQ process Y through the U-Cell. After transmission,

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the HARQ process Y;

In conjunction with the twentieth or twenty-one possible implementations of the second aspect, in a twenty-second possible implementation,

The identifier of the HARQ process of the L-Cell is different from the identifier of the HARQ process of the U-Cell.

With reference to any one of the eighth to the twenty-second possible implementation manners of the second aspect, in the twenty-third possible implementation manner,

The transceiver module is further configured to:

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, sending, to the UE, first indication information, where the first indication information is used to indicate the UE:

The UE needs to receive retransmission of the downlink data of the HARQ process Y of the U-Cell from a cell using the licensed spectrum that communicates with the UE; or

The UE needs to receive retransmission of the downlink data of all HARQ processes on the U-Cell from a cell using the licensed spectrum that communicates with the UE; or

The UE needs to receive retransmission of the downlink data of the designated HARQ process on the U-Cell from a cell using the licensed spectrum that communicates with the UE.

With reference to any one of the eighth to the twenty-second possible implementation manners of the second aspect, in the twenty-fourth possible implementation manner,

The transceiver module is further configured to send the first indication information to the UE, where the first indication information is used to indicate the UE:

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of the HARQ process Y; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of all HARQ processes on; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of the specified HARQ process.

In combination with the twenty-third or twenty-four possible implementation manners of the second aspect, in the twenty-fifth possible implementation manner,

If the first indication information is used to indicate that the UE needs to receive a retransmission of the downlink data of a specified HARQ process on the U-Cell from a cell that uses a licensed spectrum that communicates with the UE. ,then

The first indication information includes: identifier information of the specified HARQ process.

In combination with any one of the twenty-third to twenty-fifth possible implementations of the second aspect, In the twenty-sixth possible implementation manner,

The transceiver module is further configured to:

When the U-Cell has an available downlink resource for scheduling the UE to transmit the downlink data, the second indication information is sent to the UE, where the second indication information is used to indicate the UE: The U-Cell receives the downlink data of the HARQ process Y; or

Transmitting, to the UE, second indication information, where the second indication information is used to indicate that the UE: when there is available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, The U-Cell receives the downlink data of the HARQ process Y.

With reference to any one of the eighth to the twenty-sixth possible implementation manners of the second aspect, in the twenty-seventh possible implementation manner,

The transceiver module is further configured to: after performing the retransmission of the downlink data to the UE by using the L-Cell,

In a third aspect, an embodiment of the present invention provides a user equipment UE, including:

a transceiver module, configured to receive initial transmission of downlink data sent by the network device through the hybrid automatic repeat request of the unlicensed cell U-Cell, the HARQ process Y;

The transceiver module is further configured to: receive retransmission of the downlink data by the network device by using the L-Cell.

In combination with the third aspect, in a first possible implementation manner,

The transceiver module is further configured to: before receiving the retransmission of the downlink data by the network device by using the L-Cell, receiving a cross-HARQ entity/cross-cell transmission sent by the network device Configuration information;

The processing module is specifically configured to: according to the cross-HARQ entity/cross-cell transmission configuration information received by the transceiver module, determine that the retransmission mode of the downlink data is retransmission by using an L-Cell.

In combination with the third aspect, in a second possible implementation manner,

In combination with the third aspect, in a third possible implementation manner,

With reference to any one of the first to third possible implementation manners of the third aspect, in a fourth possible implementation manner,

The transceiver module is further configured to: after receiving the initial transmission of the downlink data sent by the network device by the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell retransmission sent by the network device by using the L-Cell Scheduling signaling;

The processing module is further configured to: determine, according to the cross-HARQ entity/cross-cell retransmission scheduling signaling received by the transceiver module, to receive retransmission of the downlink data from the L-Cell;

The transceiver module is specifically configured to: receive retransmission of the downlink data on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.

In conjunction with the fourth possible implementation of the third aspect, in a fifth possible implementation manner,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

Retransmitted indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.

In conjunction with the fourth or fifth possible implementation of the third aspect, in a sixth possible implementation,

The transceiver module is further configured to: before receiving the initial transmission of the downlink data sent by the network device by the HARQ process Y of the U-Cell, receive the cross-carrier scheduling signaling sent by the network device by using the U-Cell;

The processing module is further configured to: determine, according to the received cross-carrier scheduling signaling, an initial transmission that receives the downlink data from a HARQ process Y on the U-Cell;

The transceiver module is specifically configured to: receive initial transmission of the downlink data on a downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling.

In conjunction with the sixth possible implementation of the third aspect, in a seventh possible implementation,

The cross-carrier scheduling signaling includes:

Initial transmission indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.

With reference to the third aspect, or any one of the first to seventh possible implementation manners of the third aspect, in an eighth possible implementation manner,

The processing module is further configured to: after the transceiver module receives the retransmission of the downlink data by the network device by using the L-Cell, determine timing synchronization of a time advance group TAG where the U-Cell is located Whether the timer TAT has timed out, and whether the TAT of the TAG where the L-Cell is located has timed out;

The transceiver module is further configured to: after the processing module determines that the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located expires, if the processing module determines the TAT of the TAG where the L-Cell is located If there is no timeout, the feedback information for the retransmission of the downlink data is sent to the network device.

With reference to any one of the fourth to seventh possible implementation manners of the third aspect, in a ninth possible implementation manner,

The processing module is further configured to:

Merging the retransmitted data of the downlink data received by the transceiver module with data in a cache of the HARQ process Y of the U-Cell; or

And synthesizing data in the cache of the HARQ process Y of the U-Cell of the UE with data of retransmission of the downlink data received by the transceiver module.

With reference to the ninth possible implementation manner of the third aspect, in a tenth possible implementation manner,

The processing module is further configured to: before combining the retransmitted data of the downlink data received by the transceiver module,

Establishing, by the transceiver module, the HARQ process for the U-Cell of the L-Cell when the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device by using the L-Cell is received by the network device a first buffer of Y, or a first buffer corresponding to the L-Cell corresponding to a HARQ process for transmitting a retransmission of the downlink data;

After the transceiver module receives the retransmitted data of the downlink data, buffering the retransmitted data received by the transceiver module into the established first cache;

The processing module is specifically configured to: merge data in a cache of the HARQ process Y of the U-Cell of the UE with retransmitted data buffered in the first cache.

With reference to the ninth possible implementation manner of the third aspect, in an eleventh possible implementation manner,

When the downlink data corresponding to the HARQ process Y of the U-Cell is received by the HARQ entity corresponding to the L-Cell, establishing a first cache of the L-Cell for the HARQ process Y, or for And the L-Cell corresponding to the first buffer of the HARQ process for transmitting the retransmission of the downlink data, and buffering, by the transceiver module, the data of the HARQ process Y of the U-Cell to the In the first cache;

The processing module is specifically configured to: when the transceiver module receives the retransmitted retransmission data of the HARQ process Y sent by the network device by using the L-Cell, the processing module receives and caches the retransmitted data. The data of the HARQ process Y of the U-Cell in the first cache is merged with the received retransmitted retransmission data.

With reference to any one of the ninth to eleventh possible implementation manners of the third aspect, in a twelfth possible implementation manner,

The processing module is further configured to:

After merging data in the cache of the HARQ process Y of the U-Cell of the UE with data of retransmission of the downlink data received by the transceiver module, clearing the The data in the cache of the HARQ process Y corresponding to the U-Cell.

In a fourth aspect, the embodiment of the present invention provides a user equipment UE, including:

a transceiver module, configured to receive downlink data transmission by the hybrid automatic retransmission request HARQ process Y of the network device through the unlicensed cell U-Cell;

The processing module determines that the U-Cell does not have or lacks available downlink resources for scheduling the current user equipment UE to transmit the downlink data, and determines that the downlink that is performed by the network equipment is received by the authorized cell L-Cell. Transmission of data;

The transceiver module is further configured to: receive the downlink data transmission that is re-executed by the network device by using the L-Cell.

In combination with the fourth aspect, in a first possible implementation manner,

The processing module is specifically configured to: determine, by using the L-Cell, the initial transmission and retransmission of the downlink data by the network device;

The transceiver module is specifically configured to: receive initial transmission and retransmission of the downlink data by the network device by using the L-Cell.

In combination with the fourth aspect, in a second possible implementation manner,

The transceiver module is specifically configured to:

Receiving initial transmission and retransmission of the downlink data by the network device through the HARQ process Y of the U-Cell.

In conjunction with the first or second possible implementation of the fourth aspect, in a third possible implementation,

The transceiver module is further configured to: before receiving the initial transmission and retransmission of the downlink data by the network device by using the HARQ process Y of the U-Cell, receiving a cross-HARQ entity/span sent by the network device Cell transmission configuration information;

The processing module is further configured to: determine, according to the cross-HARQ entity/cross-cell transmission configuration information, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, The L-Cell replaces the U-Cell for initial transmission and retransmission of the downlink data.

In conjunction with the first or second possible implementation of the fourth aspect, in a fourth possible implementation In the way,

In conjunction with the first or second possible implementation of the fourth aspect, in a fifth possible implementation,

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission mode is preset, and the L-Cell is a primary cell PCell that communicates with the current UE.

With reference to any one of the third to fifth possible implementation manners of the fourth aspect, in a sixth possible implementation manner,

The transceiver module is further configured to: after the processing module determines that the initial transmission and retransmission of the downlink data by the network device is received by the L-Cell, the transceiver module receives the network device Before the initial transmission and retransmission of the downlink data by the L-Cell,

Receiving, by the network device, a first resource status indication message, where the first resource status indication message is used to indicate that the UE is not configured on the U-Cell to schedule the UE to transmit the downlink data. Available downlink resources;

The processing module is further configured to:

After receiving the first resource status indication message, the transceiver module determines that an initial transmission and retransmission of the downlink data needs to be received from a cell that uses the licensed spectrum that communicates with the UE; or

After the receiving, by the transceiver module, the first resource status indication message, start the first timer, if the U-Cell is still absent or lacking for scheduling the UE before the first timer expires Transmitting the available downlink resources of the downlink data, determining that an initial transmission and retransmission of the downlink data needs to be received from a cell that uses the licensed spectrum that communicates with the UE.

With reference to any one of the third to fifth possible implementation manners of the fourth aspect, in a seventh possible implementation manner,

The transceiver module is further configured to: receive a first resource status indication message sent by the network device, The first resource status indication message is used to indicate that after the first valid time length, there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell;

The processing module is further configured to:

Determining, after the first valid time length after receiving the first resource status indication message, that the transceiver module needs to receive initial transmission and weight of the downlink data from a cell that uses the licensed spectrum that communicates with the UE. Pass; or

After the first valid time length after the first resource status indication message is received by the transceiver module, the first timer is started, and if the first timer expires, if the U-Cell is still not available or In the absence of available downlink resources for scheduling the UE to transmit the downlink data, it is determined that an initial transmission and retransmission of the downlink data needs to be received from a cell using the licensed spectrum that communicates with the UE.

With reference to the sixth or seventh possible implementation manner of the fourth aspect, in an eighth possible implementation manner,

The processing module is further configured to: after determining initial transmission and retransmission of the downlink data on a cell that needs to use a licensed spectrum that communicates with the UE,

Clearing the cache of the HARQ process Y on the U-Cell.

With reference to any one of the sixth to eighth possible implementation manners of the fourth aspect, in a ninth possible implementation manner,

The transceiver module is further configured to:

Receiving a second resource status indication message sent by the network device, where the second resource status indication message is used to indicate that the UE has an available downlink for scheduling the UE to transmit the downlink data on the U-Cell. Resource

The processing module is further configured to:

After receiving, by the transceiver module, the second resource status indication message, determining that the downlink data needs to be received from the U-Cell; or

After the transceiver module receives the second resource status indication message, the second timer is started, and after the second timer expires, if the U-Cell still exists for scheduling the UE to transmit the The available downlink resources of the downlink data determine that the downlink data needs to be received from the U-Cell.

With reference to any one of the sixth to eighth possible implementation manners of the fourth aspect, in a tenth possible implementation manner,

The transceiver module is further configured to:

Receiving, by the network device, a second resource status indication message, where the second resource status indication message is used to indicate that, within the second valid time length, the U-Cell is configured to schedule the current UE to transmit the Available downlink resources for downlink data;

The processing module is further configured to:

After the transceiver module receives the second resource status indication message, if it is determined that the second effective time length is greater than a preset resource effective time length threshold, determining that the downlink data needs to be received from the U-Cell .

With reference to the fourth aspect, in an eleventh possible implementation manner,

The transceiver module is specifically configured to:

Receiving retransmission of the downlink data by the network device through the L-Cell.

With reference to the eleventh possible implementation manner of the fourth aspect, in a twelfth possible implementation manner,

The transceiver module is specifically configured to:

Receiving retransmission of the downlink data by the network device through the HARQ process X of the L-Cell.

In conjunction with the twelfth possible implementation of the fourth aspect, in a thirteenth possible implementation manner,

The transceiver module is further configured to: before receiving the retransmission of the downlink data by the network device by using the HARQ process X of the L-Cell, receiving a cross-HARQ entity/cross-cell retransmission sent by the network device Configuration information;

The processing module is further configured to: when determining, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, The HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.

In conjunction with the twelfth possible implementation of the fourth aspect, in the fourteenth possible implementation manner,

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink data. The transmission method of retransmission is preset.

In conjunction with the twelfth possible implementation of the fourth aspect, in the fifteenth possible implementation manner,

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink data. The transmission mode of the retransmission is preset; the L-Cell is the primary cell PCell that communicates with the current UE.

With reference to any one of the thirteenth to fifteenth possible implementation manners of the fourth aspect, in the sixteenth possible implementation manner,

The transceiver module is further configured to: after receiving the downlink data transmission by the network device through the HARQ process Y of the U-Cell,

Receiving, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, where the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process X;

With reference to the eleventh possible implementation manner of the fourth aspect, in the seventeenth possible implementation manner,

The transceiver module is further configured to: receive configuration information that is sent by the network device and is sent across a HARQ entity/cross-cell retransmission;

The processing module is further configured to: determine, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell And the L-Cell replaces the U-Cell to perform retransmission of the downlink data.

With reference to the eleventh possible implementation manner of the fourth aspect, in the eighteenth possible implementation manner,

With reference to the eleventh possible implementation manner of the fourth aspect, in the nineteenth possible implementation manner,

In combination with any one of the seventeenth to nineteenth possible implementations of the fourth aspect, in a twentieth possible implementation,

The transceiver module is further configured to: after the receiving network device transmits the downlink data by using the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell weight sent by the network device by using the L-Cell Transmission scheduling signaling;

In conjunction with the twentieth possible implementation of the fourth aspect, in the twenty-first possible implementation manner,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the current UE from the current and the current information. Retransmitting downlink data on a cell using an unlicensed spectrum that communicates with the current UE on a cell that uses the licensed spectrum for UE communication;

The identifier of the U-Cell;

The identifier of the HARQ process Y.

In combination with any of the seventeenth to twenty-first possible implementations of the fourth aspect, In the twenty-second possible implementation,

With reference to the eleventh possible implementation manner of the fourth aspect, in the twenty-third possible implementation manner,

The transceiver module is further configured to: before receiving the retransmission of the downlink data by the network device by using the L-Cell,

Receiving the U-Cell configuration information sent by the network device, where the U-Cell configuration information includes:

The HARQ process identifier that the UE can use on the U-Cell; or

a range of HARQ process identifiers that the UE can use on the U-Cell; or

In conjunction with the twenty-third possible implementation of the fourth aspect, in the twenty-fourth possible implementation manner,

The transceiver module is further configured to: after receiving the downlink data transmission by the network device through the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell retransmission scheduling sent by the network device by using the L-Cell Signaling, the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process Y;

The processing module is further configured to: determine, according to the received U-Cell configuration information, that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE to receive the downlink from the L-Cell Retransmission of data;

In conjunction with the twenty-third or twenty-four possible implementations of the fourth aspect, in the twenty-fifth possible implementation,

With reference to any one of the eleventh to twenty-fifth possible implementation manners of the fourth aspect, in the twenty-sixth possible implementation manner,

The transceiver module is further configured to: receive, by the network device, first indication information that is sent when the U-Cell has no or lack of available downlink resources for scheduling the UE to transmit the downlink data, where the first The indication information is used to indicate that the UE has no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell;

The processing module is further configured to: after the transceiver module receives the first indication information, determine:

Retrieving the downlink data of the HARQ process Y of the U-Cell from a cell using the licensed spectrum in communication with the current UE; or receiving the U from a cell using the licensed spectrum in communication with the current UE Retransmission of all HARQ processes on the Cell; or retransmission of the designated HARQ process on the U-Cell from the cell using the licensed spectrum in communication with the current UE.

With reference to any one of the eleventh to twenty-fifth possible implementation manners of the fourth aspect, in the twenty-seventh possible implementation manner,

The transceiver module is further configured to: receive, by the network device, first indication information;

The processing module is further configured to: determine, according to the first indication information:

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive the HARQ process Y of the U-Cell from the cell that uses the licensed spectrum that communicates with the current UE. Retransmission of the downlink data; or

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive all HARQ processes on the U-Cell from the cell using the licensed spectrum that communicates with the current UE. Retransmission of the downlink data; or

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive the specified HARQ process on the U-Cell from the cell using the licensed spectrum that communicates with the current UE. The downlink data is retransmitted.

Combining the twenty-sixth or twenty-seventh possible implementations of the fourth aspect, in the twenty-eighth Possible implementations,

And if the processing module determines that retransmission of the downlink data of the designated HARQ process on the U-Cell needs to be received from a cell that uses the licensed spectrum that is in communication with the current UE,

In conjunction with any one of the twenty-sixth to twenty-eighth possible implementations of the fourth aspect, in a twenty-ninth possible implementation,

The transceiver module is further configured to receive the second indication information that is sent by the network device, where the second indication information is used to indicate that there is an available downlink on the U-Cell for scheduling the current UE to transmit the downlink data. Receiving, after receiving the second indication information, the downlink data of the HARQ process Y from the U-Cell; or

The transceiver module is further configured to receive the second indication information that is sent by the network device, and determine, by the processing module, that the current UE is configured to transmit the downlink on the U-Cell according to the second indication information. The downlink data of the HARQ process Y is received from the U-Cell when the downlink resource of the data is available.

With reference to any one of the eleventh to twenty-ninth possible implementation manners of the fourth aspect, in a thirtieth possible implementation manner,

The transceiver module is further configured to: after receiving the downlink data transmission that is re-executed by the network device by using the L-Cell, a timing synchronization timer TAT of the group TAG at a time when the U-Cell is located After the timeout, if the TAT of the TAG where the L-Cell is located does not time out, the feedback information of the retransmission of the downlink data of the HARQ process Y is sent to the network device.

With reference to the sixteenth, twentieth, twentieth, or twenty-fourth possible implementation manners of the fourth aspect, in the thirtieth possible implementation manner,

The processing module is further configured to:

Transmitting, by the transceiver module, the retransmitted data of the downlink data to the HARQ entity corresponding to the U-Cell of the UE, and the data in the cache of the HARQ process Y of the U-Cell Merger; or

And the data in the cache of the HARQ process Y of the U-Cell of the UE, The retransmitted data of the downlink data received by the transceiver module is combined.

With reference to the thirty-first possible implementation manner of the fourth aspect, in the thirty-second possible implementation manner,

The processing module is further configured to: send data in a cache of the HARQ process Y of the U-Cell of the UE to a HARQ entity corresponding to the L-Cell of the UE, and receive Before the data of the retransmission of the downlink data is merged,

After receiving, by the transceiver module, the retransmitted data of the downlink data, buffering the received retransmitted data into the established first cache;

In conjunction with the thirtieth possible implementation of the fourth aspect, in the thirty-third possible implementation manner,

The processing module is further configured to: before the re-transmitted data of the downlink data received by the transceiver module, the HARQ entity corresponding to the L-Cell receives the U-Cell Establishing the first buffer of the L-Cell for the HARQ process Y or the HARQ process for transmitting the retransmission of the downlink data corresponding to the L-Cell when the downlink data of the HARQ process Y is a first cache, and buffering the received data of the HARQ process Y of the U-Cell into the first cache;

In combination with any of the thirty-first through thirty-third possible implementations of the fourth aspect, In the thirty-fourth possible implementation,

The processing module is further configured to:

After combining the data in the cache of the HARQ process Y of the U-Cell of the UE with the retransmitted data of the downlink data received by the transceiver module, clearing the U- of the current UE The data in the cache of the HARQ process Y corresponding to the Cell.

In a fifth aspect, an embodiment of the present invention provides a method for transmitting downlink data, including:

Performing initial transmission of downlink data to the user equipment UE by the hybrid automatic repeat request HARQ process Y of the unlicensed cell U-Cell;

Determining that the retransmission mode of the downlink data is retransmission by using an authorized cell L-Cell;

Retransmitting the downlink data to the UE by using the L-Cell.

With reference to the fifth aspect, in a first possible implementation, before the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

Transmitting the cross-HARQ entity/cross-cell transmission configuration information to the UE, the cross-HARQ entity/cross-cell transmission configuration information is used to indicate that the retransmission mode of the downlink data of the UE is retransmitted by the L-Cell.

In combination with the fifth aspect, in a second possible implementation manner,

In combination with the fifth aspect, in a third possible implementation manner,

With reference to any one of the first possible implementation manner of the fifth aspect to the third possible implementation manner, in the fourth possible implementation manner, in the HARQ process Y through the U-Cell, to the UE After the initial transmission of the downlink data, it also includes:

Retransmitting the downlink data to the UE by using the L-Cell, including:

With reference to the fourth possible implementation manner of the fifth aspect, in a fifth possible implementation manner,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

Retransmitted indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.

With reference to the fourth or fifth possible implementation manner of the fifth aspect, in the sixth possible implementation manner, before the initial transmission of downlink data to the UE by using the HARQ process Y of the U-Cell, include:

Transmitting the cross-carrier scheduling signaling to the UE by using the U-Cell, where the cross-carrier scheduling signaling is used to instruct the UE to receive the initial transmission of the downlink data from the HARQ process Y on the U-Cell ;

Performing the initial transmission of the downlink data to the UE by using the HARQ process Y of the U-Cell, including: performing, on the downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling, to the UE The initial transmission of downlink data.

With reference to the sixth possible implementation manner of the fifth aspect, in the seventh possible implementation, the cross-carrier scheduling signaling includes:

Initial transmission indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.

With reference to the fifth aspect, or any one of the first possible implementation manner of the fifth aspect to the seventh possible implementation manner, in an eighth possible implementation manner,

After the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

After determining that the timing synchronization timer TAT of the time advance group TAG of the U-Cell is timed out, if the TAT of the TAG where the L-Cell is located does not time out, waiting for the retransmission of the downlink data sent by the UE Feedback information.

In a sixth aspect, an embodiment of the present invention provides a method for transmitting downlink data, including:

Transmitting the HARQ process Y by the hybrid automatic repeat request of the unlicensed cell U-Cell, and transmitting the downlink data to the user equipment UE;

Determining, on the U-Cell, that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data, and determining to retransmit the downlink data to the UE by using the authorized cell L-Cell;

And transmitting, by the L-Cell, the downlink data to the UE.

In combination with the sixth aspect, in a first possible implementation manner,

Determining, by the L-Cell, re-transmitting the downlink data to the UE, including: determining, by using the L-Cell, performing initial transmission and retransmission of the downlink data to the UE;

Retransmitting the downlink data to the UE by using the L-Cell, including:

Performing initial transmission and retransmission of the downlink data to the UE by using the L-Cell.

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner, the performing the downlink data transmission to the UE by using the HARQ process Y of the U-Cell includes:

In conjunction with the first or second possible implementation of the sixth aspect, in a third possible implementation,

Before the initial transmission and retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

In conjunction with the first or second possible implementation of the sixth aspect, in a fourth possible implementation,

In conjunction with the first or second possible implementation of the sixth aspect, in a fifth possible implementation,

With reference to any one of the third to fifth possible implementation manners of the sixth aspect, in a sixth possible implementation manner,

After the determining, by the authorized cell L-Cell, performing initial transmission and retransmission of the downlink data to the UE, performing initial transmission of the downlink data to the UE by using the L-Cell Before retransmission, it also includes:

With reference to the sixth possible implementation manner of the sixth aspect, in a seventh possible implementation manner, the method further includes:

In conjunction with the sixth aspect, in an eighth possible implementation,

Retransmitting the downlink data to the UE by using the L-Cell, including:

Retransmitting the downlink data to the UE by using the L-Cell.

With the eighth possible implementation of the sixth aspect, in the ninth possible implementation manner, the retransmission of the downlink data to the UE by using the L-Cell includes:

With reference to the ninth possible implementation manner of the sixth aspect, in the tenth possible implementation manner, before performing the retransmission of the downlink data to the UE by using the HARQ process X of the L-Cell, include:

With reference to the ninth possible implementation manner of the sixth aspect, in an eleventh possible implementation manner,

In conjunction with the ninth possible implementation of the sixth aspect, in a twelfth possible implementation manner,

In combination with any of the tenth to twelfth possible implementations of the sixth aspect, in the thirteenth Possible implementations,

After the downlink data transmission to the UE by the HARQ process Y of the U-Cell, the method further includes:

The identifier of the HARQ process X is used to indicate that the UE performs the retransmission transmission mode of the downlink data according to the HARQ process X of the L-Cell instead of the HARQ process Y of the U-Cell, and the cross The retransmission data of the downlink data scheduled by the HARQ entity/cross-cell retransmission scheduling signaling is merged with the downlink data on the HARQ process Y on the U-Cell;

Retransmitting the downlink data to the UE by using the HARQ process X of the L-Cell, including: on the L-Cell of the cross-HARQ entity/cross-cell retransmission scheduling signaling scheduling Retransmitting the downlink data to the UE on the downlink resource.

In conjunction with the eighth possible implementation of the sixth aspect, in the fourteenth possible implementation manner,

Before performing the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

And transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, where the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE has no or lack of scheduling on the U-Cell. When the UE transmits the available downlink resources of the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data.

With reference to the eighth possible implementation manner of the sixth aspect, in the fifteenth possible implementation manner,

In conjunction with the eighth possible implementation of the sixth aspect, in the sixteenth possible implementation manner,

With reference to any one of the fourteenth to sixteenth possible implementation manners of the sixth aspect, in the seventeenth possible implementation manner,

Performing, by the L-Cell, the retransmission of the downlink data to the UE, including: on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling Retransmitting the downlink data to the UE.

In conjunction with the seventeenth possible implementation of the sixth aspect, in the eighteenth possible implementation,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the U-Cell;

The identifier of the HARQ process Y.

In conjunction with any one of the fourteenth to eighteenth possible implementations of the sixth aspect, in a nineteenth possible implementation,

With reference to the eighth possible implementation manner of the sixth aspect, in a twentieth possible implementation manner,

The HARQ process identifier that the UE can use on the U-Cell; or

a range of HARQ process identifiers that the UE can use on the U-Cell; or

With the twentieth possible implementation of the sixth aspect, in the twenty-first possible implementation manner, after the transmitting the downlink data to the UE by using the HARQ process Y of the U-Cell, the method further includes:

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the HARQ process Y, indicating that the UE determines, according to the received U-Cell configuration information, that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE from the L-Cell. Receiving retransmission of the downlink data;

Performing, by the L-Cell, the retransmission of the downlink data to the UE, where the downlink resource on the L-Cell of the cross-HARQ entity/cross-cell retransmission scheduling signaling scheduling is performed, Performing retransmission of the downlink data to the UE.

In conjunction with the twentieth or twenty-one possible implementations of the sixth aspect, in a twenty-second possible implementation,

With reference to any one of the eighth to the twenty-second possible implementation manners of the sixth aspect, in the twenty-third possible implementation manner,

Also includes:

When the U-Cell has no or no available downlink resources for scheduling the UE to transmit the downlink data, the first indication information is sent to the UE, where the first indication information is used to indicate the UE:

With reference to any one of the eighth to the twenty-second possible implementation manners of the sixth aspect, in the twenty-fourth possible implementation manner,

The method further includes: sending, to the UE, first indication information, where the first indication information is used to indicate the UE:

In conjunction with the twenty-third or twenty-four possible implementation manners of the sixth aspect, in the twenty-fifth possible implementation manner,

With reference to any one of the twenty-third to twenty-fifth possible implementation manners of the sixth aspect, in the twenty-sixth possible implementation manner,

Also includes:

There is an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell. Transmitting, to the UE, second indication information, where the second indication information is used to indicate that the UE: receives the downlink data of the HARQ process Y from the U-Cell; or

With reference to any one of the eighth to the twenty-sixth possible implementation manners of the sixth aspect, in the twenty-seventh possible implementation manner,

A seventh aspect of the present invention provides a downlink data transmission method, including:

Receiving an initial transmission of downlink data sent by the network device through the hybrid automatic repeat request of the unlicensed cell U-Cell to the HARQ process Y;

In combination with the seventh aspect, in a first possible implementation manner,

Before the receiving, by the network device, the retransmission of the downlink data by using the L-Cell, the method further includes:

Receiving the cross-HARQ entity/cross-cell transmission configuration information sent by the network device, and determining, according to the received cross-HARQ entity/cross-cell transmission configuration information, that the retransmission mode of the downlink data is retransmitted by the L-Cell.

In combination with the seventh aspect, in a second possible implementation manner,

In combination with the seventh aspect, in a third possible implementation manner,

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, and the L-Cell is a primary cell PCell that communicates with the current UE.

With reference to any one of the first to third possible implementation manners of the seventh aspect, in a fourth possible implementation manner,

After the initial transmission of the downlink data sent by the receiving network device by the HARQ process Y of the U-Cell, the method further includes:

Receiving, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, determining, according to the received cross-HARQ entity/cross-cell retransmission scheduling signaling, from the L-Cell Receiving retransmission of the downlink data;

Receiving, by the network device, retransmission of the downlink data by using the L-Cell, including: downlink resources on the L-Cell scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling Receiving a retransmission of the downlink data.

With reference to the fourth possible implementation manner of the seventh aspect, in a fifth possible implementation manner,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

Retransmitted indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.

With reference to the fourth or fifth possible implementation manner of the seventh aspect, in a sixth possible implementation manner,

Before the initial transmission of the downlink data sent by the receiving network device by the HARQ process Y of the U-Cell, the method further includes:

Receiving, by the network device, the cross-carrier scheduling signaling sent by the U-Cell, and determining, according to the received cross-carrier scheduling signaling, the initial transmission of the downlink data from the HARQ process Y on the U-Cell ;

The initial transmission of the downlink data sent by the receiving network device by the HARQ process Y of the U-Cell includes: receiving, on the downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling The initial transmission of the downlink data.

With reference to the sixth possible implementation manner of the seventh aspect, in a seventh possible implementation manner,

The cross-carrier scheduling signaling includes:

Initial transmission indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.

With reference to the seventh aspect, or any one of the first to seventh possible implementation manners of the seventh aspect, in an eighth possible implementation manner,

After the retransmission of the downlink data that is performed by the network device by using the L-Cell, the method further includes:

After the timing synchronization timer TAT of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, the retransmission of the downlink data is sent to the network device. Feedback information.

With reference to any one of the fourth to seventh possible implementation manners of the seventh aspect, in a ninth possible implementation manner, the method further includes:

And transmitting the retransmitted data of the downlink data to the HARQ entity corresponding to the U-Cell of the current UE, and merging with the data in the cache of the HARQ process Y of the U-Cell; or

And transmitting the data in the cache of the HARQ process Y of the U-Cell of the current UE to the HARQ entity corresponding to the L-Cell of the current UE, and combining the data of the retransmission of the received downlink data.

With reference to the ninth possible implementation manner of the seventh aspect, in a tenth possible implementation manner,

Before the data of the retransmitted data of the received downlink data is combined, the method further includes:

Establishing, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, the first of the L-Cell's HARQ process Y for the U-Cell Caching, or a first buffer for the HARQ process for transmitting the retransmission of the downlink data corresponding to the L-Cell;

After receiving the retransmitted data of the downlink data, buffering the received retransmitted data into the established first cache;

The merging with the retransmitted data of the received downlink data includes: merging with the retransmitted data received and buffered into the first cache.

With reference to the ninth possible implementation manner of the seventh aspect, in an eleventh possible implementation manner,

When the downlink data corresponding to the HARQ process Y of the U-Cell is received by the HARQ entity corresponding to the L-Cell, establishing a first cache of the L-Cell for the HARQ process Y, or for a first buffer of the HARQ process for transmitting the retransmitted downlink data corresponding to the L-Cell, and buffering the received data of the HARQ process Y of the U-Cell to the first cache in;

The combining with the received retransmitted retransmission data includes: receiving, when receiving the retransmitted retransmission data of the HARQ process Y sent by the network device by using the L-Cell, receiving And the data of the HARQ process Y of the U-Cell buffered in the first cache is merged with the received retransmitted retransmission data.

With reference to any one of the ninth to eleventh possible implementation manners of the seventh aspect, in a twelfth possible implementation manner,

After the data in the cache of the HARQ process Y of the U-Cell of the current UE is sent to the HARQ entity corresponding to the L-Cell of the current UE, the method further includes:

Clearing data in the cache of the HARQ process Y corresponding to the U-Cell of the current UE.

In an eighth aspect, an embodiment of the present invention provides a method for transmitting downlink data, including:

Receiving, by the network device, the downlink data transmission by the hybrid automatic retransmission requesting HARQ process Y by the unlicensed cell U-Cell;

Determining, on the U-Cell, that there is no or lack of available downlink resources for scheduling the current user equipment UE to transmit the downlink data, and determining, by using the authorized cell L-Cell, receiving the downlink data transmission that is re-executed by the network device. ;

Receiving, by the network device, the downlink data transmission by the L-Cell.

In combination with the eighth aspect, in a first possible implementation manner,

Determining, by the L-Cell, receiving the downlink data transmission that is performed by the network device, including: determining, by using the L-Cell, receiving initial transmission and retransmission of the downlink data by the network device ;

Receiving, by the network device, the transmission of the downlink data that is performed by the L-Cell, including:

Receiving initial transmission and retransmission of the downlink data by the network device through the L-Cell.

In combination with the eighth aspect, in a second possible implementation manner,

The downlink data transmission performed by the receiving network device by the HARQ process Y of the U-Cell includes:

In conjunction with the first or second possible implementation of the eighth aspect, in a third possible implementation,

Before the receiving, by the network device, the initial transmission and retransmission of the downlink data by using the HARQ process Y of the U-Cell, the method further includes:

Receiving cross-HARQ entity/cross-cell transmission configuration information sent by the network device, determining, according to the cross-HARQ entity/cross-cell transmission configuration information, that there is no or lack of scheduling on the U-Cell for scheduling the current UE to transmit the downlink When the downlink resource of the data is available, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data.

In conjunction with the first or second possible implementation of the eighth aspect, in a fourth possible implementation,

When the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission transmission of the downlink data. The way is preset.

In combination with the first or second possible implementation of the eighth aspect, in a fifth possible implementation In the way,

When the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission transmission of the downlink data. The mode is preset, and the L-Cell is a primary cell PCell that communicates with the current UE.

With reference to any one of the third to fifth possible implementation manners of the eighth aspect, in a sixth possible implementation manner,

Receiving, by the L-Cell, after receiving the initial transmission and retransmission of the downlink data by the network device, the receiving, by the network device, the downlink data by using the L-Cell Before the initial transmission and retransmission, it also includes:

Receiving, by the network device, a first resource status indication message, where the first resource status indication message is used to indicate that the current UE has no or lack of available on the U-Cell for scheduling the current UE to transmit the downlink data. Downstream resources:

After receiving the first resource status indication message, determining that an initial transmission and retransmission of the downlink data needs to be received from a cell that uses the licensed spectrum that is in communication with the current UE; or

After receiving the first resource status indication message, the first timer is started, and if the first timer expires, if the U-Cell still has no or lack of the downlink data for scheduling the current UE transmission. The available downlink resources determine that an initial transmission and retransmission of the downlink data needs to be received from a cell that uses the licensed spectrum in communication with the current UE.

With reference to any one of the third to fifth possible implementation manners of the eighth aspect, in a seventh possible implementation manner,

The method further includes: receiving a first resource status indication message sent by the network device, where the first resource status indication message is used to indicate that after the first effective time length, there is no or lack of the U-Cell for scheduling the current Transmitting, by the UE, the available downlink resources of the downlink data;

Determining, after receiving the first valid time length after receiving the first resource status indication message, requesting initial transmission and retransmission of the downlink data from a cell using the licensed spectrum that communicates with the current UE; or

After the first valid time length after receiving the first resource status indication message, start the first a timer, before the first timer expires, if there is still or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, determining that a usage authorization to communicate with the current UE is determined On the cell of the spectrum, the initial transmission and retransmission of the downlink data are received.

With reference to the sixth or seventh possible implementation manner of the eighth aspect, in an eighth possible implementation manner,

After the initial transmission and the retransmission of the downlink data are received on the cell that needs to be used from the licensed spectrum that is in communication with the current UE, the method further includes:

Clearing the cache of the HARQ process Y on the U-Cell.

With reference to any one of the sixth to the eighth possible implementation manners of the eighth aspect, in a ninth possible implementation manner, the method further includes:

Receiving, by the network device, a second resource status indication message, where the second resource status indication message is used to indicate that the current UE: the U-Cell has an available downlink resource for scheduling the current UE to transmit the downlink data;

After receiving the second resource status indication message, determining that the downlink data needs to be received from the U-Cell; or

After the second resource status indication message is received, the second timer is started. After the second timer expires, if the U-Cell still has an available downlink for scheduling the current UE to transmit the downlink data. The resource determines that the downlink data needs to be received from the U-Cell.

With reference to any one of the sixth to the eighth possible implementation manners of the eighth aspect, in a tenth possible implementation manner, the method further includes:

After the second resource status indication message is received, if it is determined that the second valid time length is greater than a preset resource effective time length threshold, it is determined that the downlink data needs to be received from the U-Cell.

With reference to the eighth aspect, in an eleventh possible implementation manner,

Receiving, by the network device, the downlink data transmission that is performed by the L-Cell, including:

With reference to the eleventh possible implementation manner of the eighth aspect, in a twelfth possible implementation manner,

Receiving, by the network device, the retransmission of the downlink data by using the L-Cell, including:

In conjunction with the twelfth possible implementation of the eighth aspect, in a thirteenth possible implementation manner,

Before the receiving, by the network device, the retransmission of the downlink data by using the HARQ process X of the L-Cell, the method further includes:

Receiving configuration information of the cross-HARQ entity/cross-cell retransmission sent by the network device, determining, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, that there is no or lack of scheduling for the current UE on the U-Cell When the available downlink resources of the downlink data are transmitted, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.

In conjunction with the twelfth possible implementation of the eighth aspect, in the fourteenth possible implementation manner,

With reference to the twelfth possible implementation manner of the eighth aspect, in the fifteenth possible implementation manner,

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink data. The transmission mode of the retransmission is preset; the L-Cell is connected to the current UE. The primary cell PCell of the letter.

With reference to any one of the thirteenth to fifteenth possible implementation manners of the eighth aspect, in the sixteenth possible implementation manner,

After the transmission of the downlink data by the receiving network device through the HARQ process Y of the U-Cell, the method further includes:

Retransmitting the downlink data by the network device by using the HARQ process X of the L-Cell, including: the L-Cell scheduled in the cross-HARQ entity/cross-cell retransmission scheduling signaling On the downlink resource, the retransmission of the downlink data is received.

With reference to the eleventh possible implementation manner of the eighth aspect, in the seventeenth possible implementation manner,

Receiving, by the network device, configuration information for transmitting a cross-HARQ entity/cross-cell retransmission, determining, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, that there is no or lack of scheduling on the U-Cell for scheduling current When the UE transmits the available downlink resources of the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data.

With reference to the eleventh possible implementation manner of the eighth aspect, in the eighteenth possible implementation manner,

When the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. Set.

With reference to the eleventh possible implementation manner of the eighth aspect, in the nineteenth possible implementation manner,

There is no or lack of available on the U-Cell for scheduling the current UE to transmit the downlink data. When the downlink resource is used, the transmission mode in which the L-Cell replaces the U-Cell to perform retransmission of the downlink data is preset; the L-Cell is a primary cell PCell that communicates with the current UE.

With reference to any one of the seventeenth to the nineteenth possible implementation manners of the eighth aspect, in the twentieth possible implementation manner,

Receiving cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device by using the L-Cell;

With reference to the twentieth possible implementation manner of the eighth aspect, in the twenty-first possible implementation manner,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the U-Cell;

The identifier of the HARQ process Y.

With reference to any one of the seventeenth to twenty-first possible implementation manners of the eighth aspect, in the twenty-second possible implementation manner,

With reference to the eleventh possible implementation manner of the eighth aspect, in the twenty-third possible implementation manner,

Receiving, by the network device, retransmission of the downlink data by using the L-Cell Before, it also includes:

The HARQ process identifier that the current UE can use on the U-Cell; or

The range of HARQ process identifiers that the current UE can use on the U-Cell; or

The starting HARQ process identifier of the current HARQ process identifier that the UE can use on the U-Cell.

In conjunction with the twenty-third possible implementation of the eighth aspect, in the twenty-fourth possible implementation manner,

Receiving, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, where the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process Y;

Determining, according to the received U-Cell configuration information, that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule retransmission of the downlink data by the current UE from the L-Cell;

In conjunction with the twenty-third or twenty-four possible implementations of the eighth aspect, in the twenty-fifth possible implementation,

With reference to any one of the eleventh to the twenty-fith possible implementation manners of the eighth aspect, in the twenty-sixth possible implementation manner, the method further includes:

Receiving, by the network device, the first indication information that is sent when the U-Cell does not have any available downlink resources for scheduling the current UE to transmit the downlink data, where the first indication information is used to indicate that the current UE: No or lack of the U-Cell for scheduling the current UE to transmit the downlink number Available downstream resources;

After receiving the first indication information, determining that retransmission of the downlink data of the HARQ process Y of the U-Cell needs to be received from a cell that uses the licensed spectrum that is in communication with the current UE; or needs to be from the current UE Receiving retransmission of all HARQ processes on the U-Cell on a cell using the licensed spectrum; or receiving a weight of a specified HARQ process on the U-Cell from a cell using the licensed spectrum in communication with the current UE pass.

With reference to any one of the eleventh to the twenty-fith possible implementation manners of the eighth aspect, in the twenty-seventh possible implementation manner,

Receiving, by the network device, sending the first indication information;

Determining according to the first indication information:

With reference to the twenty-sixth or twenty-seventh possible implementation manners of the eighth aspect, in the twenty-eighth possible implementation manner,

If it is determined that the retransmission of the downlink data of the designated HARQ process on the U-Cell needs to be received from the cell using the licensed spectrum that communicates with the current UE, then

With reference to any one of the twenty-sixth to twenty-eighth possible implementation manners of the eighth aspect, in the twenty-ninth possible implementation manner, the method further includes:

Receiving, by the network device, second indication information, where the second indication information is used to indicate: There is an available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell; and after receiving the second indication information, receiving the downlink of the HARQ process Y from the U-Cell Data; or

Receiving the second indication information that is sent by the network device, and determining, according to the second indication information, that when the U-Cell has available downlink resources for scheduling the current UE to transmit the downlink data, the U- The downlink data of the HARQ process Y is received on the Cell.

With reference to any one of the eleventh to twenty-ninth possible implementation manners of the eighth aspect, in a thirtieth possible implementation manner,

After the receiving, by the network device, the downlink data transmission that is performed by the L-Cell, the method further includes:

After the timing synchronization timer TAT of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, the downlink for the HARQ process Y is sent to the network device. Feedback information for retransmission of data.

With reference to the sixteenth, twentieth, twentieth, or twenty-fourth possible implementation manners of the eighth aspect, in the thirty-first possible implementation manner, the method further includes:

With reference to the thirtieth possible implementation manner of the eighth aspect, in the thirty-second possible implementation manner,

Establishing, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, the first of the L-Cell's HARQ process Y for the U-Cell Caching, or for the HARQ process corresponding to the L-Cell for transmitting the retransmission of the downlink data First cache;

In conjunction with the thirtieth possible implementation of the eighth aspect, in the thirty-third possible implementation manner,

With reference to any one of the thirty-first to thirty-third possible implementation manners of the eighth aspect, in a thirty-fourth possible implementation manner,

In the embodiment of the present invention, a network device, such as a base station, transmits downlink data to a UE by using an unlicensed cell U-Cell of an unlicensed spectrum, and retransmits the downlink data to the UE by using an authorized cell L-Cell of the licensed spectrum. Or retransmitting the downlink data to the UE, thereby avoiding the problem that the delay of a part of the data packets transmitted on the unlicensed spectrum is too large when there is no resource on the unlicensed spectrum.

DRAWINGS

1 is a timing diagram of a downlink HARQ process in an LTE system;

2 is a schematic structural diagram of a wireless communication system 20 according to an embodiment of the present invention;

3A to 3D are schematic diagrams of an LAA scenario;

4 is a schematic diagram of carrier aggregation;

FIG. 5 is a schematic diagram of a manner in which a user equipment communicates with a network device according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of first indication information sent by a base station according to an embodiment of the present invention;

Figure 7 is a flow chart of the first embodiment;

Figure 8 is a flow chart of the second embodiment;

Figure 9 is a flow chart of the third embodiment;

Figure 10 is a flow chart of the fourth embodiment;

Figure 11 is a flow chart of the fifth embodiment;

FIG. 12 is a schematic structural diagram of a first network device according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a second network device according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of a third network device according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of a fourth network device according to an embodiment of the present disclosure;

FIG. 16 is a schematic structural diagram of a first user equipment according to an embodiment of the present disclosure;

FIG. 17 is a schematic structural diagram of a second user equipment according to an embodiment of the present disclosure;

FIG. 18 is a schematic structural diagram of a third user equipment according to an embodiment of the present disclosure;

FIG. 19 is a schematic structural diagram of a fourth user equipment according to an embodiment of the present disclosure;

FIG. 20 is a flowchart of a first downlink data transmission method according to an embodiment of the present invention;

FIG. 21 is a flowchart of a second downlink data transmission method according to an embodiment of the present invention;

FIG. 22 is a flowchart of a third downlink data transmission method according to an embodiment of the present invention;

FIG. 23 is a flowchart of a fourth downlink data transmission method according to an embodiment of the present invention.

detailed description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, the wireless communication system provided by the embodiment of the present invention is introduced, and then the network device and the user equipment provided by the embodiment of the present invention are introduced respectively. Finally, two downlink data transmission methods provided by the embodiments of the present invention are introduced.

FIG. 2 is a schematic structural diagram of a wireless communication system 20 according to an embodiment of the present invention. As shown in FIG. 2, the wireless communication system 20 includes: a network device 201 and a user device 202, where

The network device 201 is configured to perform downlink data transmission to the user equipment 202 through the HARQ process Y of the unlicensed cell U-Cell, and retransmit the downlink data or perform retransmission of the downlink data by using the authorized cell L-Cell. ;

The user equipment 202 is configured to receive the downlink data that is sent by the network device 201 through the HARQ process Y of the U-Cell; and receive the downlink data that the network device 201 retransmits through the L-Cell, or receive the retransmission of the downlink data. ;

The U-Cell is a cell that uses an unlicensed spectrum, and the L-Cell is a cell that uses an authorized spectrum.

In the embodiment of the present invention, the communication system that the wireless communication system 20 can adopt includes, but is not limited to, the following communication standards:

Global System of Mobile communication (GSM), Code Division Multiple Access (CDMA) IS-95, Code Division Multiple Access (CDMA) 2000, Time Division Synchronous Code Division Multiple Access (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA), wideband code division Wideband Code Division Multiple Access (WCDMA), Time Division Duplexing-Long Term Evolution (TDD LTE), Frequency Division Duplexing-Long Term Evolution (FDD LTE) , Long Term Evolution-Advanced (LTE-advanced), Personal Handy-phone System (PHS), Wireless Fidelity (WiFi) specified by the 802.11 series of protocols.

The network device 201 may include a base station, or a base station, and a radio resource management device for controlling the base station.

For example, for an LTE system such as TDD LTE, FDD LTE or LTE-A, the network device 201 in the wireless communication system 20 may be an evolved Node B (eNodeB); for the TD-SCDMA system or the WCDMA system, the wireless communication system 20 The network device 201 may include: a Node B (NodeB), or a NodeB and a Radio Network Controller (RNC); for the GSM system, the network device 201 in the wireless communication system 20 may include a base transceiver station (Base) Transceiver Station, BTS), or include BTS and Base Station Controller (BSC).

In the embodiment of the present invention, the network device 201 communicates with the user equipment 202 through the U-Cell and/or the L-Cell, and performs downlink data transmission to the user equipment 202. The scenario in which the communication between the network device 201 and the user device 202 in the embodiment of the present invention may include, but is not limited to, the following four scenarios:

scene one

As shown in FIG. 3A, an authorized carrier F1 is deployed on a macro cell, an unlicensed carrier F3 is deployed on a small cell, and then a macro cell and a small cell are connected through an ideal transmission network. . In this way, the unlicensed carrier F3 of the small cell can be aggregated and used in a manner such as Carrier Aggregation (CA), with the assistance of the macro cell F1 carrier.

Scene two

As shown in FIG. 3B, an authorized carrier F2 and an unlicensed carrier F3 are respectively deployed on the small cell. Thus, with the assistance of the authorized carrier F2, the unlicensed carrier F3 can also be aggregated such as a carrier. Convergence and other methods are used.

Scene 3 and Scene 4

In scenario 3 as shown in FIG. 3C and scenario 4 shown in FIG. 3D, similarly, the unlicensed carrier F3 may be aggregated together as a user equipment in a manner such as carrier aggregation with the assistance of the authorized carrier F1 or F2. 202 provides services.

Taking the LTE system as an example, in 3GPP LTE Release 10 and Release 11, carrier aggregation technology has been adopted as a method of expanding system bandwidth. In order to meet the requirements of the International Mobile Telecom System-Advanced (IMT-Advanced) and support high-speed data rates, carrier aggregation is introduced. The main idea of carrier aggregation is to combine multiple component carriers (CCs). Converged into a larger bandwidth carrier to support high-speed data rates. As shown in Figure 4 below, the following line (base station transmission, user equipment reception) is taken as an example. The downlink bandwidth of the system can be aggregated by five 20 MHz carriers. In carrier aggregation, one CC is also called a cell.

In the embodiment of the present invention, a cell that uses an authorized spectrum is referred to as an L-Cell, and a cell that uses an unlicensed spectrum is referred to as a U-Cell. On the U-Cell, the wireless communication system 20 still needs to compete with other systems, such as the Wifi system, so resources are not continuously effective on the U-Cell. After competing for resources, the user equipment 202 can use a certain time, for example, 5 ms, but after 5 ms, there may be a certain time, for example, 10 ms, the user equipment 202 cannot obtain the resources of the U-Cell again.

Hereinafter, an embodiment of the present invention will be described in detail by taking the transmission mode shown in FIG. 5 as an example.

In FIG. 5, the network device 201, where the eNB in the LTE system is taken as an example, configures the L-Cell and the U-Cell for the user equipment 202 to perform data transmission, where the L-Cell is located in the macro base station, ie, the eNB, and the U-Cell Located in a small cell. The macro base station and the small cell are connected by an ideal backhaul. The transmission delay between the ideal transmission network, that is, the macro base station and the small cell, is negligible.

Among them, L-Cell is responsible for assisting U-Cell in data transmission. The UE acquires scheduling information of the eNB's resources for the U-Cell from the L-Cell, and then uses the resources scheduled on the U-Cell for data transmission. Same The UE may also use the resources on the L-Cell for data transmission according to the scheduling of the L-Cell by the eNB.

In the embodiment of the present invention, a HARQ process Y of a U-Cell may be replaced by an L-Cell HARQ process X instead of an initial transmission and/or retransmission; or a U-Cell HARQ process Y may also be an L- Multiple HARQ processes of the Cell, such as: X ₁ , X ₂ , ..., X _{n are} used to replace the initial transmission and/or retransmission; or, alternatively, a plurality of HARQ processes of a U-Cell Y ₁ , Y ₂ , ..., Y _m may be replaced by a plurality of HARQ processes X ₁ , X ₂ , ..., X _{n of} one L-Cell, in turn, in place of initial transmission and/or retransmission, where m, n are positive integers.

In the following description, an HARQ process X is used as a HARQ process Y to replace the initial transmission and/or retransmission as an example. The other cases are the same, and are not described here.

In the embodiment of the present invention, on the user equipment 202, the HARQ process X of the L-Cell and the HARQ process Y of the U-Cell may use the same or different caches to buffer the downlink data sent by the network device 201.

In the embodiment of the present invention, the downlink data of the HARQ process Y may be any Redundancy Version (RV) of the downlink data.

For ease of understanding, the LTE system is taken as an example to describe the related concepts of the HARQ process. In the LTE system, different cells (Cells) respectively establish independent Hybrid Automatic Repeat ReQuest (HARQ) entities, and the HARQ processes on mutually independent HARQ entities are also independent of each other. The HARQ function is implemented at the MAC layer and has the following features:

- Multi-process stop-wait mode;

- transmission/retransmission for transport blocks (TB);

- In the downlink direction, that is, the direction in which the network device such as the base station transmits data to the user equipment (User Equipment, UE), has the following features:

- adopting asynchronous adaptive HARQ mode, that is, retransmission does not occur at a fixed time relative to the initial transmission, and its modulation mode or coding mode can be flexibly changed;

- carrying the HARQ process number by the signaling of the Physical Downlink Control CHannel (PDCCH), and indicating whether it is an initial transmission or a retransmission;

- The acknowledgment (Negative ACK), the ACK/NACK, used to feed back the downlink transmission or the retransmission, is on the physical uplink control channel (Physical Uplink Control CHannel, PUCCH) or the physical uplink shared channel (Pystic Uplink Shared CHannel). , PUSCH) is sent.

Hereinafter, an embodiment of the present invention will be described in detail by taking an LTE system as an example. In the LTE system, the network device 201 is an eNB, and the user equipment 202 is a UE. The signaling that the network device 201 schedules the UE to perform downlink data transmission is PDCCH scheduling signaling.

In the following description, the five implementations listed in Table 1 are separately described. For each implementation, an embodiment is illustrated.

The specific implementations of the first embodiment to the fifth embodiment are different, and the features of the five embodiments and the corresponding drawings are summarized in Table 1.

Table 1

Hereinafter, each implementation manner will be described in detail.

Implementation one

The HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell for retransmission of downlink data.

In the implementation manner 1, the eNB performs resource competition on the unlicensed carrier, and when the resource is contending, the UE may allocate resources for data transmission on the U-Cell. Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling signaling to the UE, where the scheduling signaling is used to perform data transmission for the UE to schedule resources on the U-Cell.

The eNB may determine that the downlink data is retransmitted to the UE through the HARQ process X of the L-Cell when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell.

For example, the eNB sends the configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, instructing the UE to: when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process of the L-Cell is X. Substituting the HARQ process Y of the U-Cell for retransmission of the downlink data; the UE determines, according to the received cross-HARQ entity/cross-cell transmission configuration information, that there is no or lack of U-Cell for scheduling the transmission of the downlink data by itself. When the downlink resource is available, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.

For example, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the retransmission of the downlink data. Presupposed;

When the transmission mode of the retransmission is preset, optionally, the L-Cell may be a primary cell that communicates with the UE. PCell.

The eNB may be absent or lacking available downlink resources for scheduling the UE to transmit the downlink data when the following conditions are met:

There is no resource on the U-Cell for scheduling any HARQ process of the UE; or

There is no resource on the U-Cell for scheduling the HARQ process X of the UE; or

The U-Cell lacks resources for scheduling any one HARQ process of the UE, for example, the available duration of the resource is less than a preset resource available duration threshold; or

The U-Cell lacks resources for scheduling the HARQ X process of the UE. For example, the available duration of the resource is less than the preset resource available duration threshold.

Optionally, after the downlink data is transmitted to the UE by using the HARQ process Y of the U-Cell, the method further includes:

The eNB sends, by using the L-Cell, a cross-HARQ entity/cross-cell retransmission scheduling signaling, such as PDCCH scheduling signaling, to the UE, where the signaling includes:

ID of the HARQ process X;

The identifier of the HARQ process is used to indicate that the UE performs the retransmission transmission mode of the downlink data according to the HARQ process X of the L-Cell instead of the HARQ process Y of the U-Cell, and the cross-HARQ entity/cross-cell retransmission scheduling signaling is performed. The retransmitted data of the scheduled downlink data is merged with the downlink data on the HARQ process Y.

The eNB performs retransmission of the downlink data to the UE on the downlink resource that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling, for example, the downlink physical resource. The UE receives the retransmission of the downlink data on the downlink resource scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.

Optionally, the UE determines the corresponding HARQ process X according to the identifier of the HARQ process X in the cross-HARQ entity/cross-cell retransmission scheduling signaling; and performs the HARQ process Y according to the L-Cell instead of the HARQ process Y of the U-Cell. The transmission mode of the retransmission of the downlink data determines that the HARQ process X corresponds to the HARQ process Y. Optionally, in the first implementation manner, the HARQ process X is not used to transmit data of the HARQ process, and is only used to replace the retransmission. The UE will retransmit the retransmission data of the downlink data on the HARQ process X scheduled by the scheduling scheduling signaling across the HARQ entity/cross-cell, and the determined HARQ The downlink data on process Y is merged.

Optionally, the eNB may send the first indication information to the UE when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, where the first indication information is used to indicate the UE:

The UE needs to receive retransmission of the downlink data of the U-Cell's HARQ process Y from the cell using the licensed spectrum communicated with the UE; or the UE needs to receive all of the U-Cell from the cell using the licensed spectrum communicated with the UE Retransmission of downlink data of the HARQ process; or the UE needs to receive retransmission of downlink data of the designated HARQ process on the U-Cell from the cell using the licensed spectrum that communicates with the UE.

Alternatively, the eNB may send the first indication information to the UE. Optionally, the eNB may send the first indication information when the U-Cell is configured for the UE, where the first indication information is used to indicate the UE:

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the weight of the downlink data of the HARQ process Y of the U-Cell from the cell using the licensed spectrum that communicates with the UE. Pass; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the downlink data of all HARQ processes on the U-Cell from the cell using the licensed spectrum that communicates with the UE. Pass; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the downlink data of the specified HARQ process on the U-Cell from the cell using the licensed spectrum that communicates with the UE. Optionally, the first indication information may further include: identifier information that specifies a HARQ process.

For example, an octet Oct1 as shown in FIG. 6 may be included in the first indication information:

In the Oct1, H1-H7 respectively represent the first to eighth HARQ processes, and then the corresponding bit is set to "0" to indicate that the HARQ process does not perform cross-HARQ entity/cross-cell retransmission, and the corresponding bit is set to "1" to indicate the The HARQ process performs cross-HARQ entity/cross-cell retransmission.

Optionally, the eNB may also have an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, such as: there is a resource for scheduling each HARQ process of the UE, or there is a HARQ process for scheduling the UE. When the resource of Y is sent to the UE, the second indication information, the second indication letter The information is used to indicate that the UE receives the downlink data of the HARQ process Y from the U-Cell; or

The eNB sends the second indication information to the UE, where the second indication information is used to indicate that the UE receives the downlink data of the HARQ process Y from the U-Cell when there is an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell. .

Optionally, the second indication information indicates that the downlink data that the UE receives the HARQ process Y from the U-Cell may include: initial transmission and/or retransmission of the downlink data.

Optionally, after receiving the retransmission data of the downlink data of the HARQ process Y by the HARQ process X of the L-Cell, the UE combines the received retransmission data with the downlink data previously transmitted on the U-Cell.

The UE may have received the retransmission data of the downlink data on the U-Cell before receiving the retransmission data of the downlink data by the HARQ process X of the L-Cell. Generally, the UE receives the retransmission. After the data is combined with the data of the HARQ process Y on the U-Cell, the merged data is cached. Therefore, after receiving the retransmitted data through the L-Cell, a possible situation is that it will be received. The retransmitted data is merged with the cached data that may have been merged before.

Specifically, the UE can adopt the following processing methods:

Processing method one

The UE sends the received retransmission data to the HARQ entity corresponding to the U-Cell of the UE (where one cell corresponds to one HARQ entity on the UE), and merges with the data in the cache of the HARQ process Y of the U-Cell;

Processing method 2

The UE sends the data in the buffer of the HARQ process Y of its own U-Cell to the HARQ entity of its own L-Cell, and merges with the retransmitted data of the received retransmission; optionally, the U-Cell of its own After the data in the cache of the HARQ process Y is sent to the HARQ entity of the L-Cell, the UE may also clear the data in the cache of the HARQ process Y of its own U-Cell.

Optionally, for processing mode 2, the UE may establish a first cache of the HARQ process X for the L-Cell when receiving the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the eNB through the L-Cell; After retransmitting the retransmitted data, the received retransmitted retransmitted data is cached to the established first cache. The UE may merge the retransmitted retransmission data received and buffered into the first buffer when merging with the received retransmitted retransmission data; or

The UE may establish a first buffer of the HARQ process X for the L-Cell when the HARQ entity of the L-Cell receives the data of the HARQ process Y of the U-Cell, and obtain the data of the HARQ process Y of the received U-Cell. Caching into the first cache; receiving data and receiving the HARQ process Y of the U-Cell in the first cache when receiving the retransmitted data of the retransmission of the HARQ process Y transmitted by the eNB through the L-Cell The retransmission data to the retransmission is merged.

Optionally, after performing the retransmission of the downlink data of the HARQ process Y to the UE by using the HARQ process X of the L-Cell, the method further includes:

The eNB determines that the Timing Alignment Timer (TAT) of the Timing Advance Group (TAG) of the U-Cell is not received, and does not receive the retransmission of the downlink data for the HARQ process Y sent by the UE. Feedback information; and

After determining the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, if the TAT of the TAG where the L-Cell is located does not time out, the UE waits for feedback information of the retransmission of the downlink data for the HARQ process Y. .

After the timing synchronization timer TAT of the TAG of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, the UE still sends the retransmission of the downlink data for the HARQ process Y to the network device. Feedback.

The TAG is composed of one or more serving cells that can share the same timing advance (TA) value, that is, all cells in one TAG can use the same TA value.

In the current LTE system, when a Timing Advance Group (TAG) Timing Alignment Timer (TAT) times out, the HARQ entity of the cell in the TAG will not feed back the ACK to the physical layer. /NACK, which is feedback information for receiving data.

In the embodiment of the present invention, the downlink data is retransmitted by the HARQ process X of the L-Cell instead of the HARQ process Y of the U-Cell. If the current LTE system is used, the UE is in the U-Cell. After the TAT of the TAG is timed out, the feedback information of the retransmission of the HARQ process Y is not fed back to the eNB. At this time, if the TAT of the TAG where the L-Cell is located does not time out, the eNB cannot receive the L-Cell. The HARQ process X replaces the feedback information of the downlink data retransmitted by the HARQ process Y of the U-Cell.

Therefore, in the embodiment of the present invention, after the time synchronization timer TAT of the time advance group TAG of the U-Cell is timed out, if the TAT of the TAG where the L-Cell is located does not time out, the UE still sends the HARQ process to the network device. The feedback information of the retransmission of the downlink data of Y to ensure that the eNB can receive the feedback information.

With the implementation manner 1, the data retransmission can be implemented across the HARQ entity/cross-cell, thereby ensuring the continuity of the service transmitted on the U-Cell, thereby ensuring a good user experience.

A specific example of implementation mode 1 can be found in the following first embodiment.

Implementation 2

In the second implementation manner, the L-Cell replaces the U-Cell to perform retransmission of the downlink data, and the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are independently allocated, that is, the HARQ entity of the U-Cell and the HARQ entity. The HARQ process number of the HARQ process of the HARQ entity of the L-Cell may be the same.

In the implementation manner 2, the eNB performs resource competition on the unlicensed carrier, and when the resource is contending, the UE may allocate resources for data transmission on the U-Cell. Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling signaling to the UE, where the scheduling signaling is used to perform data transmission for the UE to schedule resources on the U-Cell.

The eNB may determine to perform retransmission of the downlink data to the UE by using the L-Cell when it is determined that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell.

For example, the eNB sends the configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, and indicates to the UE that the L-Cell replaces the U-Cell when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell. Performing retransmission of the downlink data; the UE according to the received cross-HARQ entity/ The configuration information is transmitted across the cell, and it is determined that when the U-Cell does not have or lacks available downlink resources for scheduling the transmission of the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data.

For example, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the L-Cell replaces the U-Cell to perform the retransmission of the downlink data by using a preset manner;

When the transmission mode of the retransmission is preset, optionally, the L-Cell may be a primary cell PCell that communicates with the UE.

Similar to the implementation manner 1, in the second implementation manner, the eNB may perform the HARQ process to the UE through the HARQ process X of the L-Cell when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell. Retransmission of the downlink data of Y. For the condition that the eNB determines that there is no or no available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, reference may be made to the corresponding description in the first implementation manner, and details are not described herein again.

Different from the first implementation manner, in the implementation manner 2, the specific HARQ process X and the HARQ process Y are not specified, and only which L-Cell is used for the HARQ process of the U-Cell for downlink data retransmission.

Similar to the implementation manner 1, in the implementation manner 2, the eNB may also send the cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE through the L-Cell, for example, PDCCH scheduling signaling, but different from the implementation manner In the implementation manner 2, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the eNB is used to indicate that the UE: receives the retransmission of the downlink data of the U-Cell HARQ process Y from the L-Cell.

Specifically, the cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

An indication of retransmission across a HARQ entity/cross-cell,

The cross-HARQ entity/cross-cell retransmission indication information is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE to use the communication with the UE from the cell that uses the licensed spectrum that communicates with the UE. Retransmission of downlink data on a cell of an unlicensed spectrum;

U-Cell logo;

ID of the HARQ process Y.

Downlink resources of the eNB on the L-Cell of the scheduling of the cross-HARQ entity/cross-cell retransmission scheduling signaling The retransmission of the downlink data is performed to the UE. The UE receives the retransmission of the downlink data on the downlink resource scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.

The UE may determine, according to the indication information of the cross-HARQ entity/cross-cell retransmission, that the retransmission scheduling signaling is used to schedule the UE to use the unlicensed communication with the UE from the cell that uses the licensed spectrum that communicates with the UE. Retransmission of downlink data on a cell of the spectrum;

Based on the identifier of the U-Cell and the identifier of the HARQ process Y, the UE can determine which HARQ process of the U-Cell is retransmitted for the retransmission, so that after receiving the retransmitted retransmission data, Merged with the data of the corresponding U-Cell HARQ process.

Optionally, in implementation manner 2, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the eNB may further include at least one of the following information:

The identifier of the HARQ process X of L-Cell;

The retransmission indication information is used to indicate that the scheduling signaling is used to schedule retransmission.

Similar to the implementation manner 1, in the second implementation manner, the eNB may also send the first indication information and the second indication information to the UE, and the content and the sending manner of the two types of information, and the processing manner of the UE, refer to the implementation manner 1, repeating It will not be repeated here.

For example, after the UE receives the retransmission data of the retransmission of the HARQ process Y through the HARQ process X of the L-Cell, the processing mode and the merging mode of the retransmission data of the HARQ process Y are also referred to.

Optionally, the eNB receives the feedback information about the retransmission of the downlink data of the HARQ process Y sent by the UE according to the TAT of the TAG where the U-Cell is located, and the TAT of the TAG where the L-Cell is located, and the UE sends the feedback. For the way of information, you can also refer to the implementation method 1, and the repetition will not be repeated.

The second method can implement the data retransmission across the HARQ entity/cross-cell, thereby ensuring the continuity of the service transmitted on the U-Cell, thereby ensuring a good user experience.

A specific example of implementation 2 can be found in the second embodiment below.

Implementation mode three

In the third implementation manner, the L-Cell replaces the U-Cell to perform downlink data retransmission, and the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are jointly allocated, and a resource pool sharing a HARQ process number is shared. That is, the HARQ process number of the HARQ process on the HARQ entity of the U-Cell and the HARQ entity of the L-Cell is different.

In the third implementation manner, the eNB performs resource competition on the unlicensed carrier. When the resource is contending for resources, the UE may allocate resources for data transmission on the U-Cell. Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling signaling to the UE, where the scheduling signaling is used to perform data transmission for the UE to schedule resources on the U-Cell.

Similar to the

implementation manners

1 and 2, in the third implementation manner, the eNB may perform the downlink data to the UE through the L-Cell when there is no or lack of available downlink resources for scheduling the UE to transmit downlink data on the U-Cell. Retransmission. For the condition that the eNB determines that there is no or no available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, reference may be made to the corresponding description in the first implementation manner, and details are not described herein again.

Different from the

implementation manners

1 and 2, in the implementation manner 3, before the eNB performs the retransmission of the downlink data to the UE by using the L-Cell, the eNB does not send the cross-HARQ entity/cross-cell retransmission to the UE. The configuration information is sent, but the U-Cell configuration information is sent. The U-Cell configuration information includes:

The HARQ process identifier that the UE can use on the U-Cell; or

The range of HARQ process identifiers that the UE can use on the U-Cell; or

The starting HARQ process identifier in the HARQ process identifier that the UE can use on the U-Cell.

The above information is used to indicate the range of the identity of the HARQ process that the U-Cell can use.

Similar to the

implementation manners

1 and 2, in the implementation manner 3, the eNB may also send the cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE through the L-Cell, for example, PDCCH scheduling signaling, but the implementation manner is implemented. Different from the implementation manner 2, in the implementation manner 3, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the eNB includes:

ID of the HARQ process Y,

The UE is instructed to determine, according to the received U-Cell configuration information, cross-HARQ entity/cross-cell retransmission scheduling signaling for scheduling retransmission of downlink data of the HARQ process Y received by the UE from the L-Cell.

In the third embodiment, the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are jointly allocated, and the identifier of the HARQ process of the U-Cell available to the UE is notified in advance through the U-Cell configuration information. Therefore, after receiving the scheduling signaling, the UE determines, according to the identifier of the HARQ process Y in the scheduling signaling, that the scheduling signaling is used to schedule downlink transmission on the U-Cell.

Optionally, the scheduling signaling may further include retransmission indication information, where the retransmission indication information is used to indicate that the scheduling signaling is used for scheduling retransmission, or may be pre-agreed in the downlink data of the HARQ process on the U-Cell. Only the retransmission will be performed on the L-Cell, and the initial transmission will not be performed at the L-Cell.

Therefore the UE can determine that the scheduling signaling is used to schedule retransmissions. The UE receives the retransmission data according to the scheduling signaling, and combines the retransmission data with the previously transmitted data of the HARQ process Y indicated in the scheduling signaling.

Optionally, the identifier of the L-Cell may also be included in the scheduling signaling.

Similar to the

implementation manners

1 and 2, in the implementation manner 3, the eNB may also send the first indication information and the second indication information to the UE, and the content and the sending manner of the two types of information, and the processing manner of the UE may be implemented. The first method, the repetition will not be repeated.

In the third implementation manner, data retransmission can be implemented across the HARQ entity/cross-cell, thereby ensuring the continuity of the service transmitted on the U-Cell, thereby ensuring a good user experience.

A specific example of implementation mode 3 can be found in the third embodiment below.

Implementation four

In the fourth implementation mode, the L-Cell replaces the U-Cell for initial transmission and retransmission of downlink data.

Different from the implementation modes 1-3, in the implementation manners 1-3, the L-Cell only replaces the U-Cell for downlink data retransmission. In the implementation manner 4, whether the downlink data is performed on the U-Cell or not In the initial transmission, the initial transmission and retransmission of the downlink data are re-executed on the L-Cell.

In the fourth implementation manner, the eNB performs resource competition on the unlicensed carrier. When the resource is contending for resources, the UE may allocate resources for data transmission on the U-Cell. Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling signaling to the UE, where the scheduling signaling is used to perform data transmission for the UE to schedule resources on the U-Cell.

For example, the eNB sends the configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, and indicates to the UE that the L-Cell replaces the U-Cell when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell. Performing initial transmission and retransmission of the downlink data. The UE determines, according to the received cross-HARQ entity/cross-cell transmission configuration information, that there is no or lack of available downlink resources for scheduling the transmission of the downlink data on the U-Cell. The L-Cell replaces the U-Cell for initial transmission and retransmission of the downlink data.

For example, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the L-Cell replaces the U-Cell to perform the initial transmission and retransmission transmission mode of the downlink data is preset;

When the transmission mode of the initial transmission and the retransmission is preset, optionally, the L-Cell may be a primary cell PCell that communicates with the UE.

In the fourth implementation manner, the eNB may send the first resource status indication message to the UE when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, where the first resource status indication message is used. Instructing the UE:

There is no or lack of available downlink resources for scheduling UE to transmit the downlink data on the U-Cell; UE After receiving the first resource status indication message, determining that an initial transmission and retransmission of the downlink data needs to be received from a cell using the licensed spectrum that communicates with itself; or

After receiving the first resource status indication message, the UE starts the first timer. Before the first timer expires, if the U-Cell still has no or lacks available downlink resources for scheduling the UE to transmit the downlink data, it is determined. The initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum that communicates with itself.

Or, in the fourth implementation manner, the eNB may send the first resource status indication message to the UE when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data. The indication message is used to indicate that the UE does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data after the first valid time length;

After receiving the first resource status indication message, the UE determines that after the first valid time length after receiving the message, the UE needs to receive the initial transmission and weight of the downlink data from the cell that uses the licensed spectrum that communicates with itself. Pass; or

After receiving the first valid time length of the first resource status indication message, the UE starts the first timer. Before the first timer expires, if the U-Cell still has no or lacks for scheduling the UE to transmit the downlink data. The available downlink resources determine that the initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum that communicates with itself.

Optionally, after determining, by the UE, that the initial transmission and the retransmission of the downlink data are received from the cell that uses the licensed spectrum that is in communication with the current UE, the UE may clear the cache of the HARQ process Y on the U-Cell.

For the condition that the eNB determines that there is no or no available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, refer to the implementation manner 1 and no further details are provided herein.

Optionally, when there are available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, for example, there are resources for scheduling each HARQ process of the UE, or resources for scheduling the HARQ process Y of the UE. The eNB may send a second resource status indication message to the UE, where the second resource status indication message is used to indicate that the UE has an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell;

After receiving the second resource status indication message, the UE determines that the downlink data needs to be received from the U-Cell; or the UE starts the second timer after receiving the second resource status indication message, after the second timer expires If the U-Cell still has available downlink resources for scheduling the UE to transmit the downlink data, it is determined that the downlink data needs to be received from the U-Cell.

Or, when there is an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, the eNB sends a second resource status indication message to the UE, where the second resource status indication message is used to indicate the UE: Within the valid time length, there are available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.

After receiving the second resource status indication message, if the second valid time length is greater than the preset resource effective time length threshold, the UE determines that the downlink data needs to be received from the U-Cell.

Optionally, in the specification, the first resource status indication information and the second resource status indication information may be transmitted in one of the following messages:

Radio Resource Control (RRC) message;

Medium Access Control (MAC) Control Element (CE) message;

Physical layer control messages.

Implementation five

In the fifth implementation manner, the U-Cell performs only the initial transmission of the downlink data, and the L-Cell performs the retransmission of the downlink data.

Optionally, the eNB may determine to perform retransmission of the downlink data through the L-Cell direction before performing retransmission of the downlink data to the UE.

For example, the eNB sends the configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, and indicates to the UE that the retransmission mode of the downlink data is retransmission by the L-Cell.

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset; in this case, the L-Cell may be the primary cell PCell that communicates with the UE.

Optionally, in implementation manner 5, the eNB may send cross-carrier scheduling signaling, such as PDCCH scheduling signaling, to the UE, by using the U-Cell, to instruct the UE to receive the initial transmission of the downlink data from the U-Cell.

The PDCCH scheduling signaling may include:

Initial transmission indication information;

U-Cell logo; and

ID of the HARQ process Y. The UE receives the cross-carrier scheduling signaling sent by the eNB through the L-Cell, and determines the initial transmission of the downlink data that receives the HARQ process Y from the U-Cell according to the received cross-carrier scheduling signaling.

The eNB performs initial transmission of the downlink data to the UE on the downlink resource of the U-Cell scheduled by the cross-carrier scheduling signaling, and the UE receives the downlink resource sent by the eNB on the received downlink resource scheduled by the cross-carrier scheduling signaling. The initial transmission of downlink data.

Optionally, the eNB may also send, by using an L-Cell, a cross-HARQ entity/cross-cell retransmission scheduling signaling, such as PDCCH scheduling signaling, to instruct the UE to receive the HARQ process Y on the U-Cell from the L-Cell. The retransmission of the downlink data.

The cross-HARQ entity/cross-cell retransmission scheduling signaling may include:

Retransmitted indication information;

U-Cell logo; and

ID of the HARQ process Y.

The UE receives the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the eNB through the L-Cell, and determines to receive the HARQ process on the U-Cell from the L-Cell according to the received cross-HARQ entity/cross-cell retransmission scheduling signaling. Retransmission of the downlink data of Y.

The eNB performs retransmission of the downlink data to the UE on the downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling, and the UE performs scheduling signaling scheduling in the cross-HARQ entity/cross-cell retransmission. On the downlink resource on the L-Cell, the retransmission of the downlink data is received.

In the fifth implementation manner, data retransmission can be implemented across the HARQ entity/cross-cell, thereby ensuring the continuity of the service transmitted on the U-Cell, thereby ensuring a good user experience.

A specific example of implementation mode 5 can be found in the fifth embodiment below.

In order to better understand and distinguish the five implementation methods, the following five aspects are compared for comparison.

First, the eNB downlink scheduling mode

The eNB downlink scheduling mode is as shown in Table 2 below.

Table 2

Second, scheduling signaling

The manner in which the scheduling signaling is sent, and the processing of the UE can be seen in Table 3 below.

table 3

Third, the corresponding relationship of alternative transmission

The correspondence of the alternative transmission can be seen in Table 4 below.

Table 4

Fourth, the instructions

In the embodiment of the present invention, the indication information is used to indicate the available resources on the U-Cell. For the content and the transmission mode, refer to Table 5 below.

table 5

Five, technical effects

The five implementation manners provided by the embodiments of the present invention can implement data transmission across the HARQ entity/cross-cell, and ensure continuity of services transmitted on the U-Cell, thereby ensuring a good user experience.

The method 1 to 3, and the implementation manner 5, the retransmission of the downlink data of the U-Cell by using the L-Cell, the UE combines the retransmitted data with the received downlink data that is previously transmitted, and implements Correct reception of downlink data.

In the implementation manner 5, the fixed configuration is performed on the U-Cell for initial transmission of downlink data, and the downlink data is retransmitted on the L-Cell, and the implementation manner is simpler.

In the implementation method 4, whether the initial transmission of the downlink data is performed on the U-Cell, the initial transmission and the retransmission of the downlink data are re-executed in the L-Cell, and the reliability of the data transmission is more ensured, but the loss is certain. Transmission efficiency.

In addition, in the foregoing five implementation manners, the identifiers of the HARQ process X and the HARQ process Y may be the same in other implementation manners except for the implementation manner 3.

In the following, the above five implementation manners are exemplified by the first embodiment to the fifth embodiment.

[Embodiment 1]

As shown in FIG. 7, the first embodiment includes the following steps:

S701: The UE receives configuration information of cross-HARQ entity/cross-cell retransmission sent by the eNB, where the configuration information includes identifiers of one or more L-Cells for re-HARQ entity/cross-cell retransmission for the U-Cell, and U -Cell's HARQ process Y, the identifier of the HARQ process X used to replace the U-Cell for retransmission on the L-Cell. On the UE, the HARQ process X can use the same cache as the corresponding HARQ process Y on the U-Cell.

Specifically, a U-Cell HARQ process Y can be replaced by an L-Cell HARQ process X. Alternatively, a U-Cell HARQ process Y may be replaced by multiple HARQ processes of an L-Cell, such as X ₁ , X ₂ ... X _n . Or a plurality of HARQ processes Y ₁ , Y ₂ ... Y _{m of} one U-Cell may be alternately retransmitted by a plurality of HARQ processes X ₁ , X ₂ , ... X _{n of} one L-Cell, wherein m and n is a positive integer.

In the following, the replacement transmission of a U-Cell HARQ process Y by an L-Cell HARQ process X will be described as an example.

S702: The eNB performs resource competition on the unlicensed carrier, and allocates resources for the UE to perform data transmission on the U-Cell when competing for resources. Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling information to the UE, where the scheduling information is used to schedule data transmission on the U-Cell for the UE, for example, MAC protocol data. Protocol Data Unit (PDU).

S703: The eNB sends the activation/indication information of the cross-HARQ entity/cross-cell retransmission, that is, the foregoing first indication information, to the UE when there is no resource transmission on the U-Cell for the HARQ process Y of the UE.

The indication information may specifically include a HARQ process number (an identifier of a HARQ process) for performing cross-HARQ entity/cross-cell retransmission, such as: HARQ process Y. Alternatively, the HARQ process number Y that needs to be retransmitted across the HARQ entity/cross-cell may not be explicitly indicated. In this case, the UE has only one HARQ process on the U-CELL, and then the UE starts from the HARQ process X of the L-Cell. Obtain the retransmitted data packet on the U-Cell HARQ process Y.

Alternatively, it is also possible that all current U-Cell HARQ processes perform cross-HARQ entity/cross-cell retransmission. Specifically, which process needs to be retransmitted across the HARQ entity/cross-cell, it can be specifically indicated by the following indication information. For example, referring to FIG. 6, the activation/indication information of the cross-HARQ entity/cross-cell retransmission can be designed as follows: H1-H7 respectively represent the 1st to 8th HARQ processes, and then the corresponding bit is set to "0" to indicate that the HARQ process is not Perform cross-HARQ entity/cross-cell retransmission, and the corresponding bit is set to "1" to indicate that the HARQ process performs cross-HARQ entity/cross-cell retransmission.

S703: Alternatively, when receiving the configuration information of the cross-HARQ entity/cross-cell retransmission in step S701, the UE may always listen to the HARQ process X of the L-Cell to obtain the weight on the HARQ process Y of the U-Cell. Pass

S704: The UE receives the PDCCH scheduling signaling that is sent by the eNB on the L-Cell, or is the MAC layer signaling, that is, the foregoing cross-HARQ entity/cross-cell retransmission scheduling signaling. Here, taking the PDCCH scheduling signaling as an example, The PDCCH scheduling signaling includes the following information:

■ configured in step S701 as a U-Cell instead of the retransmitted L-Cell HARQ process number X;

The UE combines the data on the corresponding HARQ process X with the data of the HARQ process Y of the U-Cell according to the HARQ process X indicated in the PDCCH scheduling signaling.

Specifically, the merging mode may be that the UE receives the data from the HARQ entity of the L-Cell and submits the data to the HARQ entity corresponding to the U-Cell for HARQ merging. Alternatively, the UE may determine that the cross-HARQ entity needs to be performed according to step S701. The data of the HARQ entity on the U-Cell is forwarded to the HARQ entity corresponding to the L-Cell, and the data is cached on the configured L-Cell to replace the cache corresponding to the retransmitted HARQ process. Then, when the data retransmitted on the corresponding HARQ process X is received, HARQ merge is performed with the currently cached data.

S705: With respect to step S703, when the eNB competes for a new resource on the U-Cell, the eNB may send, to the UE, deactivation/cancellation information across the HARQ entity/cross-cell retransmission, that is, the foregoing second indication information, to The UE is instructed to stop data processing across the HARQ entity/cross-cell transmission, and the data is continuously received from the HARQ process of the U-Cell.

In Figs. 7 to 11, the steps shown by broken lines are optional steps.

Further, in the process of data transmission on the U-Cell, if the TAT of the TAG where the U-Cell is located expires, but if the data on the HARQ process of the U-Cell is being replaced by the L-Cell, then Under the following conditions, the UE's HARQ entity should still report the ACK/NACK information on the corresponding HARQ process to the physical layer:

■ The TAG of the TAG of the U-Cell expires. However, the associated TAT of the TAG where the L-Cell is replaced by the retransmission does not time out.

[Embodiment 2]

In the second embodiment, the HARQ processes of the U-Cell and the L-Cell are independent of each other, that is, the HARQ processes of the U-Cell and the L-Cell are independently assigned numbers, that is, the HARQ entity of the U-Cell and the HARQ corresponding to the L-Cell. The same HARQ process number can appear in the HARQ process on the entity.

As shown in FIG. 8, the second embodiment includes the following steps:

S801: The UE receives configuration information of the cross-HARQ entity/cross-cell retransmission sent by the eNB, where the configuration information includes information of one or more L-Cells for the U-Cell to retransmit the HARQ entity/cross-Cell. Specifically, each U-Cell may correspond to one or more L-Cells as a cell for its replacement transmission.

S802: The eNB performs resource competition on the unlicensed carrier, and allocates resources for the UE to perform data transmission on the U-Cell when competing for resources. Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling information to the UE, where the scheduling information is used to perform data transmission for the UE to schedule resources on the U-Cell.

S803: The eNB sends the indication/activation information of the cross-HARQ entity/cross-cell retransmission to the UE when the UE does not have the resource scheduling on the U-Cell for data transmission on the one or more HARQ processes of the U-Cell, and the UE starts from the L. - The HARQ process of the Cell obtains a packet for retransmission in place of the U-Cell HARQ process.

S803': Alternatively, when receiving the configuration information retransmitted by the HARQ entity/cross-cell in step S801, the UE may always listen to the L-Cell to obtain a data packet that is retransmitted instead of the U-Cell HARQ process;

S804: The UE receives PDCCH scheduling signaling sent by the eNB on the L-Cell, where the PDCCH scheduling signaling includes the following information:

■ Whether it is an indication of retransmission across a HARQ entity/cross-cell;

■ U-Cell identification information;

■ The HARQ process number on the original U-Cell;

And optionally including at least one of the following information:

■ the HARQ process number on the L-Cell of the currently scheduled data packet;

■Retransmitting instructions

Further, for the cross-HARQ entity/cross-cell replacement for the retransmitted data packet, the UE will receive the HARQ entity from the L-Cell and submit the data packet to the corresponding HARQ entity of the U-Cell for merging.

Specifically, the UE determines, according to the PDCCH scheduling signaling, that the PDCCH scheduling signaling scheduling is The retransmission of the data on the HARQ process Y of the U-Cell, the UE receives the corresponding retransmission data based on the PDCCH scheduling signaling, and delivers the received data to the HARQ entity corresponding to the U-Cell, and then HARQ with the U-Cell. The data in the cache of process Y is HARQ merged.

Alternatively, the buffered data corresponding to the HARQ process Y of the U-Cell may be delivered to the HARQ entity corresponding to the L-Cell, and then the data of the retransmission on the HARQ process Y received from the L-Cell is in the L- Cell merges. Specifically, before the merging, the UE needs to first establish a buffer for the HARQ process Y in the L-Cell when receiving the retransmission of the HARQ process Y scheduled by the PDCCH scheduling signaling. Alternatively, when the HARQ entity of the L-Cell receives the data packet for the HARQ process Y submitted by the HARQ entity from the U-Cell, the cache is first established in the L-Cell for the HARQ process Y. Optionally, the HARQ process Y may be cleared in the buffer of the U-Cell at this time, and when the retransmission data packet is received from the L-Cell according to the PDCCH scheduling signaling, the buffered data and the received retransmission data are performed. merge.

S805: With respect to step S803, when the eNB competes for new resources on the U-Cell, the eNB may send deactivation/cancellation information across the HARQ entity/cross-cell retransmission to the UE to instruct the UE to stop transmitting across the HARQ entity. The data is processed to return to receive data from the U-Cell HARQ process.

Further, in the process of performing data transmission on the U-Cell, if the TAT of the TAG where the U-Cell is located expires, but if the data on the HARQ process of the U-Cell is being replaced by the L-Cell, then Under the following conditions, the UE's HARQ entity should still report the ACK/NACK information on the corresponding HARQ process to the physical layer:

[Embodiment 3]

In the third embodiment, the U-Cell and the L-Cell share a resource pool of the HARQ process ID, that is, the HARQ process numbers of the U-Cell and the L-Cell are uniformly numbered, and the HARQ entity of the U-Cell and the HARQ corresponding to the L-Cell The same HARQ process number does not appear between HARQ processes on the entity.

As shown in FIG. 9, the third embodiment includes the following steps:

S901: The UE receives the U-Cell configuration information sent by the eNB, where the U-Cell configuration information includes a HARQ process ID that can be used by the U-Cell, or a range of HARQ process numbers that can be used, or an initial HARQ process that should be used. number.

For example, for the LTE FDD system, the value of the HARQ process ID that can be used by the L-Cell can be: 0-7. The value of the HARQ process ID that can be used by the U-Cell can be 8-15.

For the LTE TDD system, the value of the HARQ process ID that can be used by the L-Cell can be: 0-15. The value of the HARQ process ID that can be used by the U-Cell can be 16-31.

S902: The eNB performs resource competition on the unlicensed carrier, and allocates resources for the UE to perform data transmission on the U-Cell when competing for resources. Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling information to the UE, where the scheduling information is used to perform data transmission for the UE to schedule resources on the U-Cell.

S903: When the eNB does not have a resource scheduling UE on the U-Cell, the eNB sends the indication/activation information of the retransmission of the HARQ entity/cross-cell to the UE, and the UE starts to obtain the HARQ process of the U-Cell instead of the HARQ process of the L-Cell. Retransmitted packets.

S903': Alternatively, when receiving the configuration information retransmitted by the HARQ entity/cross-cell in step S901, the UE may always listen to the L-Cell to obtain a data packet that is retransmitted instead of the U-Cell HARQ process;

S904: The UE receives PDCCH scheduling signaling sent by the eNB on the L-Cell, where the PDCCH scheduling signaling includes the following information:

■ The HARQ process number of the scheduled data on the U-Cell;

And optionally also includes:

■Retransmitting instructions

Further, for the retransmission of the data packet across the HARQ entity/cross-cell, the UE will receive the data packet from the HARQ entity of the L-Cell and submit the corresponding HARQ entity to the U-Cell for merging. Specifically, the UE determines, according to the PDCCH scheduling signaling, the retransmission of the data in the HARQ process Y of the U-Cell scheduled by the PDCCH signaling, and the UE receives the corresponding retransmission data based on the PDCCH scheduling information, and submits the received data. Go to the HARQ entity corresponding to U-Cell and then enter HARQ with U-Cell The data in the cache of the program Y is HARQ merged; or

It is also possible to deliver the buffered data corresponding to the HARQ process Y of the U-Cell to the HARQ entity corresponding to the L-Cell, and then perform the data with the retransmission on the HARQ process Y received from the L-Cell in the L-Cell. Consolidate. Specifically, before the merging, the UE needs to first establish a buffer for the HARQ process Y in the L-Cell when receiving the retransmission of the PDCCH scheduled HARQ process Y. Alternatively, when the HARQ entity of the L-Cell receives the data packet for the HARQ process Y submitted by the HARQ entity of the U-Cell, first establishes a buffer for the HARQ process Y in the L-Cell, optionally, the The HARQ process Y is cleared in the buffer of the U-Cell. When the retransmission data packet is received from the L-Cell according to the PDCCH scheduling signaling, the buffered data and the received retransmission data are combined.

S905: With respect to step S903, when the eNB competes for a new resource on the U-Cell, the eNB may send deactivation/cancellation information across the HARQ entity/cross-cell retransmission to the UE to indicate that the UE stops performing the cross-HARQ entity/ Data processing across the cell transmissions to return to continue receiving data from the U-Cell's HARQ process.

Further, in the process of performing data transmission on the U-Cell, if the TAT of the TAG where the U-Cell is located times out, but if the data on the HARQ process of the U-Cell is being replaced by the L-Cell, then Under the following conditions, the UE's HARQ entity should still report the ACK/NACK information on the corresponding HARQ process to the physical layer:

[Embodiment 4]

As shown in FIG. 10, the fourth embodiment includes the following steps:

S1001: The UE receives cross-HARQ entity/cross-Cell transmission configuration information sent by the eNB, where the cross-HARQ entity/cross-cell transmission configuration information indicates that the UE receives a new one from the L-Cell when determining that the U-Cell resource is lacking or no resource is available. data.

This step is optional. Alternatively, the UE may receive new data from the L-Cell by default when the U-Cell resource is lacking or there is no resource available. Here, the lack of U-Cell resources may mean that there is a lack of resources in a certain process of U-Cell, or a lack of resources in all U-Cell processes.

S1002: The eNB performs resource contention on the unlicensed carrier, and allocates resources for the UE to perform data transmission on the U-Cell when competing for resources. Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling information to the UE, where the scheduling information is used to perform data transmission for the UE to schedule resources on the U-Cell.

S1003: The eNB sends a U-Cell resource status indication message, that is, the foregoing first resource status indication message, to the UE, when the U-Cell contends for the resource or the contending resource is to be exhausted, the eNB includes: Lack of resources or resources on the U-Cell.

Specifically, the U-Cell resource status indication message may be an RRC message, a MAC Control Element message, or physical layer control signaling, such as PDCCH signaling.

After receiving the U-Cell resource status indication message, the UE determines that it needs to continue to receive new data packets from the L-Cell, and then clears the buffer corresponding to the current U-Cell HARQ process. Alternatively, after receiving the U-Cell resource status indication message, the UE first starts the timer T1. If there is still no resource on the U-Cell before the timer T1 expires, after the timer T1 times out, the current U- is cleared. The cache corresponding to the HARQ process of the Cell.

Optionally, after clearing the buffer of the corresponding HARQ process, the UE may further release the HARQ process.

Alternatively, the foregoing U-Cell resource status indication message may indicate the effective time length of the resource when the eNB competes for resources on the U-Cell, and then the UE determines, according to the valid time length, that there is no valid resource on the current U-Cell. When it is determined, it is determined that the new data packet needs to be continuously received from the L-Cell, and then the buffer corresponding to the current U-Cell HARQ process is cleared. Or, when the UE determines that there is no valid resource on the current U-Cell, the timer T2 is started. If there is still no resource on the U-Cell before the timer T2 expires, the current U-Cell is cleared after the T2 timer expires. The corresponding HARQ process cache.

S1004: When there is no available resource on the U-Cell, the eNB uses the resources on the L-Cell to send the data that needs to be sent on the U-Cell to the UE on the L-Cell. Originally needed in U-Cell The data sent on the data includes: data that has not been successfully transmitted to the UE after the initial transmission or a certain number of repeated transmissions of the U-Cell, and data that has not been transmitted on the U-Cell. The UE then re-receives from the L-Cell the data that was originally required to be received from the U-Cell. The re-receiving may be: the UE receives the data originally received from the U-Cell through the new HARQ process on the L-Cell, or the UE still uses the same HARQ process number from the original U-Cell from the L-Cell. Receive data on the HARQ process.

S1005: The eNB continues to contend for resources on the unlicensed carrier. When the eNB contends to the new resource, the eNB sends a U-Cell resource status indication message, that is, the foregoing second resource status indication message, to indicate the new U-Cell. The length of time available on the resource.

After receiving the U-Cell resource status indication message, the UE determines to start monitoring the scheduling information of the U-Cell, and receives data from the U-Cell; or

After receiving the U-Cell resource status indication message, the UE determines the length of the available resource. When the determined length of the available resource is greater than a certain threshold, the UE determines to start monitoring the scheduling information of the U-Cell. - receiving data on the Cell; or

After receiving the U-Cell resource status indication message, the UE starts the timer T3. After the timer T3 times out, if there are still resources available on the U-Cell, the UE starts to monitor the scheduling information of the U-Cell, from the U-Cell. Receive data on.

[Embodiment 5]

As shown in FIG. 11, Embodiment 5 includes the following steps:

S1101: The UE receives configuration information of an inter-HARQ entity/cross-cell retransmission sent by the eNB, where the configuration information includes information of one or more L-Cells that perform retransmission by the HARQ entity/cross-cell for the U-Cell.

Specifically, each U-Cell may be configured with one L-Cell as its alternate transmission cell. Further, the configuration information may indicate that the UE receives the initial transmission of data only on the HARQ process of the U-Cell, and receives the retransmission corresponding to the HARQ process from the L-Cell.

Alternatively, in addition to using the configuration information in step S1101, the relationship between the L-Cell and the U-Cell may also be agreed by a certain rule. For example, you can choose the primary cell (PCell) as the replacement for U-Cell. The cell is transmitted on its behalf, and is not specifically configured through configuration information.

Further, it may also be agreed that the UE receives the initial transmission of data only on the HARQ process of the U-Cell, and receives the retransmission of the corresponding HARQ process from the L-Cell.

S1102: The eNB performs resource contention on the unlicensed carrier, and allocates resources for the UE to perform data transmission on the U-Cell when competing for resources.

Specifically, when the eNB contends to the resources on the U-Cell, the L-Cell may send scheduling information to the UE, where the scheduling information is used to perform data transmission for the UE to schedule resources on the U-Cell.

S1103: The UE monitors PDCCH scheduling signaling sent by the eNB, receives corresponding scheduling information, and receives initial transmission of the corresponding data packet from the HARQ process Y of the U-Cell, and then receives data for the HARQ process Y from the L-Cell. Retransmission of the package.

Specifically, the PDCCH scheduling signaling includes the following information:

■ New Data Indication (NDI);

■ U-Cell identification information;

■ HARQ process number Y;

When the PDCCH scheduling signaling received by the UE from the eNB includes the foregoing information, if the value of the NDI indicates the initial transmission, the UE determines that the PDCCH scheduling signaling is cross-carrier scheduling signaling, and the UE receives the HARQ process Y from the U-Cell. New data packet;

When the PDCCH scheduling signaling received by the UE from the eNB includes the foregoing information, if the value of the NDI indicates retransmission, the UE determines that the PDCCH scheduling signaling is cross-HARQ entity retransmission/cross-cell retransmission scheduling signaling, then the UE The retransmitted data packet of the HARQ process Y is received from the L-Cell.

Further, for the retransmission of the data packet across the HARQ entity/cross-cell, the UE will forward the data packet received from the HARQ entity of the L-Cell to the HARQ entity corresponding to the U-Cell for merging. Specifically, the UE determines, according to the PDCCH scheduling signaling, the retransmission of the data in the HARQ process Y of the U-Cell scheduled by the PDCCH scheduling signaling, and the UE receives the corresponding retransmission data according to the scheduling information in the PDCCH scheduling information, and Delivering the received data to the HARQ entity corresponding to the U-Cell and then performing HARQ combining with the data in the cache of the HARQ process Y of the U-Cell; or

The UE may also deliver the cached data corresponding to the HARQ process Y of the U-Cell to the corresponding L-Cell. The HARQ entity is then combined with the retransmitted data on the HARQ process Y received from the L-Cell at the L-Cell.

Specifically, before the merging, the UE needs to first establish a buffer for the HARQ process Y on the L-Cell when receiving the PDCCH scheduling signaling and scheduling the retransmission of the HARQ process Y. Alternatively, when the HARQ entity of the L-Cell receives the data packet for the HARQ process Y submitted by the HARQ entity of the U-Cell, first establishes a buffer for the HARQ process Y in the L-Cell, optionally, the The cache of the HARQ process Y is cleared on the U-Cell. When the retransmission data packet is received from the L-Cell according to the PDCCH scheduling signaling, the buffered data and the received retransmission data are combined.

The wireless communication system provided by the embodiment of the present invention is described above, and is illustrated by the first embodiment to the fifth embodiment. Based on the same inventive concept, the embodiment of the present invention further provides a network device, a user equipment, and a method for transmitting downlink data. Since the principle of solving the problem is similar to the wireless communication system provided by the embodiment of the present invention, the implementation may refer to the implementation of the system, and the repeated description is not repeated.

FIG. 12 is a schematic structural diagram of a first network device according to an embodiment of the present invention. As shown in FIG. 12, the network device includes:

The transceiver module 1201 is configured to perform an initial transmission of downlink data to the user equipment UE by using a hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

The processing module 1202 is configured to determine that the retransmission mode of the downlink data is retransmission by using the authorized cell L-Cell;

The transceiver module 1201 is further configured to: perform retransmission of the downlink data to the UE by using the L-Cell.

Optionally, the transceiver module 1201 is further configured to:

Sending a cross-HARQ to the UE before performing retransmission of the downlink data to the UE through the L-Cell The entity/trans-cell transmission configuration information, and the cross-HARQ entity/cross-cell transmission configuration information is used to indicate that the UE retransmits the downlink data by using the L-Cell.

Optionally, the retransmission mode of the downlink data that is retransmitted by the L-Cell is preset.

Optionally, the retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, and the L-Cell is a primary cell PCell that communicates with the UE.

Optionally, the transceiver module 1201 is further configured to:

After performing initial transmission of downlink data to the UE through the HARQ process Y of the U-Cell, the inter-HARQ entity/cross-cell retransmission scheduling signaling is transmitted to the UE through the L-Cell, and the scheduling message is retransmitted across the HARQ entity/cross-cell. Re-transmission for instructing the UE to receive the downlink data from the L-Cell;

The transceiver module 1201 is specifically configured to:

The downlink data is retransmitted to the UE on the downlink resource on the L-Cell that is scheduled by the HARQ entity/cross-cell retransmission scheduling signaling.

Optionally, the cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

Retransmitted indication information;

U-Cell logo; and

ID of the HARQ process Y.

Optionally, the transceiver module 1201 is further configured to:

Before the initial transmission of downlink data to the UE by the HARQ process Y of the U-Cell, the cross-carrier scheduling signaling is sent to the UE through the U-Cell, and the cross-carrier scheduling signaling is used to indicate the HARQ of the UE from the U-Cell. Process Y receives the initial transmission of the downlink data;

The transceiver module 1201 is specifically configured to: perform initial transmission of the downlink data to the UE on the downlink resource on the U-Cell that is scheduled by the cross-carrier scheduling signaling.

Optionally, the cross-carrier scheduling signaling includes:

Initial transmission indication information;

U-Cell logo; and

ID of the HARQ process Y.

Optionally, the transceiver module 1201 is further configured to: go to the UE through the L-Cell at the transceiver module 1201. After the retransmission of the downlink data,

Determining, before the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, not receiving feedback information about the retransmission of the downlink data sent by the UE;

After determining the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, if the TAT of the TAG where the L-Cell is located does not time out, it waits to receive feedback information about the retransmission of the downlink data sent by the UE.

For other optional implementation details of the network device, reference may be made to the foregoing network device 201, and the repeated description is omitted.

FIG. 13 is a schematic structural diagram of a second network device according to an embodiment of the present invention. As shown in FIG. 13, the network device includes:

The transceiver 1301 is configured to perform an initial transmission of downlink data to the user equipment UE by using a hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

The processor 1302 is configured to determine that the retransmission mode of the downlink data is retransmission by using the authorized cell L-Cell;

The transceiver 1301 is further configured to: perform retransmission of the downlink data to the UE by using the L-Cell.

For other optional implementations of the transceiver 1301, reference may be made to the transceiver module 1201. Other optional implementation manners of the processor 1302 may refer to the processing module 1202. Other optional implementation details of the network device may be repeated by referring to the foregoing network device 201. It will not be repeated here.

FIG. 14 is a schematic structural diagram of a third network device according to an embodiment of the present invention. As shown in FIG. 14, the network device includes:

The transceiver module 1401 is configured to perform the downlink data transmission to the user equipment UE by using the hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

The processing module 1402 is configured to determine that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, and determine that the downlink data is retransmitted to the UE by using the authorized cell L-Cell;

The transceiver module 1401 is further configured to: retransmit the downlink data to the UE by using the L-Cell.

Optionally, the processing module 1402 is specifically configured to: determine, by using the L-Cell, perform the downlink to the UE. Initial transmission and retransmission of data

The transceiver module 1401 is specifically configured to: perform initial transmission and retransmission of the downlink data to the UE by using the L-Cell.

Optionally, the transceiver module 1401 is specifically configured to:

The initial transmission and retransmission of the downlink data are performed to the UE through the HARQ process Y of the U-Cell.

Optionally, the transceiver module 1401 is further configured to: before performing initial transmission and retransmission of the downlink data to the UE by using the L-Cell,

Transmitting the cross-HARQ entity/cross-cell transmission configuration information to the UE, and transmitting the configuration information across the HARQ entity/cross-cell to indicate that the UE does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, -Cell replaces the U-Cell for initial transmission and retransmission of the downlink data.

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. .

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The L-Cell is a primary cell PCell that communicates with the UE.

Optionally, the transceiver module 1401 is further configured to: after the processing module 1402 determines to perform initial transmission and retransmission of the downlink data to the UE by using the authorized cell L-Cell, the transceiver module 1401 performs the downlink to the UE by using the L-Cell. Before the initial transmission and retransmission of data,

When there is no or no available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, the first resource status indication message is sent to the UE, where the first resource status indication message is used to indicate the UE:

After the first effective time length, there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell.

Optionally, the transceiver module 1401 is further configured to:

When there is an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, the UE is present to the UE. Sending a second resource status indication message, where the second resource status indication message is used to indicate the UE:

There are available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data; or

Optionally, when the transceiver module 1401 retransmits the downlink data to the UE by using the L-Cell, the transceiver module 1401 is specifically configured to:

The downlink data is retransmitted to the UE through the L-Cell.

Optionally, the transceiver module 1401 is specifically configured to:

The downlink data is retransmitted to the UE through the HARQ process X of the L-Cell.

Optionally, the transceiver module 1401 is further configured to: before performing the retransmission of the downlink data to the UE by using the HARQ process X of the L-Cell,

Transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, and the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE has no or lack of available downlink for scheduling the UE to transmit the downlink data on the U-Cell. When the resource is used, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.

Optionally, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the retransmission transmission of the downlink data. The way is preset.

Optionally, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the retransmission transmission of the downlink data. The mode is preset; the L-Cell is the primary cell PCell that communicates with the UE.

Optionally, the transceiver module 1401 is further configured to: after performing downlink data transmission to the UE by using the HARQ process Y of the U-Cell,

The cross-HARQ entity/cross-cell retransmission scheduling signaling is sent to the UE by using the L-Cell, and the cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the HARQ process X is used to instruct the UE to perform the retransmission transmission mode of the downlink data according to the HARQ process X of the L-Cell instead of the HARQ process Y of the U-Cell, and the cross-HARQ entity Retransmission data of the downlink data scheduled by the cross-cell retransmission scheduling signaling is merged with the downlink data on the HARQ process Y of the U-Cell;

The transceiver module 1401 is specifically configured to perform retransmission of the downlink data to the UE on the downlink resource on the L-Cell that is scheduled by the HARQ entity/cross-cell retransmission scheduling signaling.

Optionally, the transceiver module 1401 is further configured to: before performing the retransmission of the downlink data to the UE by using the L-Cell,

The configuration information of the cross-HARQ entity/cross-cell retransmission is sent to the UE, and the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE: the L-Cell replaces the U-Cell to perform retransmission of the downlink data.

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform the retransmission of the downlink data by using a preset manner.

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform the retransmission of the downlink data, and the transmission mode is preset; The Cell is the primary cell PCell that communicates with the UE.

Optionally, the transceiver module 1401 is further configured to: after transmitting the downlink data to the UE by using the HARQ process Y of the U-Cell:

Transmitting the HARQ entity/cross-cell retransmission scheduling signaling to the UE by using the L-Cell, and the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to instruct the UE to receive the retransmission of the downlink data from the L-Cell;

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE to use the licensed spectrum from the UE to communicate with the UE. Retransmitting the downlink data on the cell using the unlicensed spectrum in communication with the UE;

U-Cell logo;

ID of the HARQ process Y.

Optionally, the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are independent. Assigned.

Optionally,

The transceiver module 1401 is further configured to: before performing the retransmission of the downlink data to the UE by using the L-Cell,

The U-Cell configuration information is sent to the UE, and the U-Cell configuration information includes:

The HARQ process identifier that the UE can use on the U-Cell; or

The range of HARQ process identifiers that the UE can use on the U-Cell; or

Transmitting HARQ entity/cross-cell retransmission scheduling signaling to the UE through the L-Cell,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

ID of the HARQ process Y;

Optionally, the identifier of the HARQ process of the L-Cell is different from the identifier of the HARQ process of the U-Cell.

Optionally, the transceiver module 1401 is further configured to:

The UE needs to receive the retransmission of the downlink data of the HARQ process Y of the U-Cell from the cell using the licensed spectrum that communicates with the UE; or

The UE needs to receive retransmission of the downlink data of all HARQ processes on the U-Cell from the cell using the licensed spectrum that communicates with the UE; or

The UE needs to receive retransmission of the downlink data of the designated HARQ process on the U-Cell from the cell using the licensed spectrum that communicates with the UE.

Optionally, the transceiver module 1401 is further configured to send the first indication information to the UE, where the first indication information is used to indicate the UE:

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the retransmission of the downlink data of the HARQ process Y of the U-Cell from the cell using the licensed spectrum that communicates with the UE. ;or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the weight of the downlink data of all HARQ processes on the U-Cell from the cell using the licensed spectrum that communicates with the UE. Pass; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the weight of the downlink data of the designated HARQ process on the U-Cell from the cell using the licensed spectrum that communicates with the UE. pass.

Optionally, if the first indication information is used to indicate that the UE needs to receive the retransmission of the downlink data of the specified HARQ process on the U-Cell from the cell that uses the licensed spectrum that is in communication with the UE,

The first indication information includes: identifier information that specifies a HARQ process.

Optionally, the transceiver module 1401 is further configured to:

When there is an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, the second indication information is sent to the UE, where the second indication information is used to: receive the downlink data of the HARQ process Y from the U-Cell; or

The second indication information is sent to the UE, where the second indication information is used to indicate that the UE receives the downlink data of the HARQ process Y from the U-Cell when there is an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell.

Optionally, the transceiver module 1401 is further configured to: after performing the retransmission of the downlink data to the UE by using the L-Cell,

For other optional implementation details of the network device, reference may be made to the foregoing network device 201, and the repetition is not Let me repeat.

FIG. 15 is a schematic structural diagram of a fourth network device according to an embodiment of the present invention. As shown in FIG. 15, the network device includes:

The transceiver 1501 is configured to perform downlink data transmission to the user equipment UE by using a hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

The processor 1502 is configured to determine that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, and determine to retransmit the downlink data to the UE by using the authorized cell L-Cell;

The transceiver 1501 is further configured to: retransmit the downlink data to the UE by using the L-Cell.

For other optional implementations of the transceiver 1501, reference may be made to the transceiver module 1401. Other possible implementations of the processor 1502 may refer to the processing module 1402. For other optional implementation details of the network device, reference may be made to the foregoing network device 201, where it is repeated. No longer.

FIG. 16 is a schematic structural diagram of a first user equipment according to an embodiment of the present invention. As shown in FIG. 16, the user equipment includes:

The transceiver module 1601 is configured to receive initial transmission of downlink data sent by the network device through the hybrid automatic repeat request of the unlicensed cell U-Cell, the HARQ process Y;

The processing module 1602 is configured to determine that the retransmission mode of the downlink data is retransmission by using the authorized cell L-Cell;

The transceiver module 1601 is further configured to: receive retransmission of the downlink data by the network device by using the L-Cell.

Optionally, the transceiver module 1601 is further configured to: before receiving the retransmission of the downlink data by the network device by using the L-Cell, receive the cross-HARQ entity/cross-cell transmission configuration information sent by the network device;

The processing module 1602 is specifically configured to: according to the cross-HARQ entity/cross-cell transmission configuration information received by the transceiver module 1601, determine that the retransmission mode of the downlink data is retransmission by using the L-Cell.

Optionally, the retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, L-Cell The primary cell PCell that is in communication with the UE.

Optionally, the transceiver module 1601 is further configured to: after receiving the initial transmission of the downlink data sent by the network device by the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell retransmission scheduling sent by the network device by using the L-Cell. Signaling

The processing module 1602 is further configured to: determine, according to the cross-HARQ entity/cross-cell retransmission scheduling signaling received by the transceiver module 1601, the retransmission of the downlink data received from the L-Cell;

The transceiver module 1601 is specifically configured to: receive retransmission of the downlink data on a downlink resource on the L-Cell that is scheduled by the HARQ entity/cross-cell retransmission scheduling signaling.

Retransmitted indication information;

U-Cell logo; and

ID of the HARQ process Y.

Optionally, the transceiver module 1601 is further configured to: before receiving the initial transmission of the downlink data sent by the network device by the HARQ process Y of the U-Cell, receive the cross-carrier scheduling signaling sent by the network device by using the U-Cell;

The processing module 1602 is further configured to: determine, according to the received cross-carrier scheduling signaling, an initial transmission that receives the downlink data from the HARQ process Y on the U-Cell;

The transceiver module 1601 is specifically configured to: receive initial transmission of the downlink data on a downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling.

Optionally, the cross-carrier scheduling signaling includes:

Initial transmission indication information;

U-Cell logo; and

ID of the HARQ process Y.

Optionally, the processing module 1602 is further configured to: after the transceiver module 1601 receives the retransmission of the downlink data by the network device by using the L-Cell, determine whether the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located is timed out. And whether the TAT of the TAG where the L-Cell is located times out;

The transceiver module 1601 is further configured to: at the processing module 1602, determine a time advance group in which the U-Cell is located. After the timing synchronization timer TAT of the TAG expires, if the processing module 1602 determines that the TAT of the TAG where the L-Cell is located has not timed out, the feedback information for the retransmission of the downlink data is sent to the network device.

Optionally, the processing module 1602 is further configured to:

Combining the retransmitted data of the downlink data received by the transceiver module 1601 with the data in the cache of the HARQ process Y of the U-Cell; or

The data in the buffer of the HARQ process Y of the U-Cell of the UE is combined with the data of the retransmission of the downlink data received by the transceiver module 1601.

Optionally, the processing module 1602 is further configured to: before combining the retransmitted data of the downlink data received by the transceiver module 1601,

When the transceiver module 1601 receives the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device through the L-Cell, the first buffer of the HARQ process Y for the U-Cell of the L-Cell is established, or for the L-Cell Corresponding a first cache of the HARQ process for transmitting the retransmitted downlink data;

After receiving the retransmitted data of the downlink data, the transceiver module 1601 buffers the retransmitted data received by the transceiver module 1601 into the established first cache.

The processing module 1602 is specifically configured to: merge the data in the cache of the HARQ process Y of the U-Cell of the UE with the retransmitted data buffered into the first cache.

When the downlink data of the HARQ process Y of the U-Cell is received by the HARQ entity corresponding to the L-Cell, the first buffer of the L-Cell for the HARQ process Y is established, or the downlink data corresponding to the L-Cell is used for transmitting the downlink data. The first cache of the retransmitted HARQ process, and buffering the data of the U-Cell HARQ process Y received by the transceiver module 1601 into the first cache;

The processing module 1602 is specifically configured to: when the transceiver module 1601 receives the retransmitted retransmission data of the HARQ process Y sent by the network device through the L-Cell, the HARQ process Y of the U-Cell received and cached in the first cache The data is combined with the retransmitted data of the received retransmission.

Optionally, the processing module 1602 is further configured to:

The data in the cache of the HARQ process Y of the U-Cell of the UE, and the transceiver module 1601 After the retransmitted data of the received downlink data is combined, the data in the cache of the HARQ process Y corresponding to the U-Cell of the UE is cleared.

For other optional implementation details of the UE, reference may be made to the foregoing user equipment 202, and the repeated description is omitted.

FIG. 17 is a schematic structural diagram of a second user equipment according to an embodiment of the present invention. As shown in FIG. 17, the user equipment includes:

The transceiver 1701 is configured to receive, by the network device, an initial transmission of downlink data that is sent by the hybrid automatic repeat request of the unlicensed cell U-Cell, the HARQ process Y;

The processor 1702 is configured to determine that the retransmission mode of the downlink data is retransmission by using the authorized cell L-Cell;

The transceiver 1701 is further configured to: receive retransmission of the downlink data by the network device by using the L-Cell.

For other optional implementations of the transceiver 1701, reference may be made to the transceiver module 1601. Other optional implementations of the processor 1702 may refer to the processing module 1602. For other optional implementation details of the UE, refer to the foregoing user equipment 202, and repeat I won't go into details here.

FIG. 18 is a schematic structural diagram of a third user equipment according to an embodiment of the present invention. As shown in FIG. 18, the user equipment includes:

The transceiver module 1801 is configured to receive downlink data transmission by the hybrid automatic retransmission request HARQ process Y of the network device by the unlicensed cell U-Cell;

The processing module 1802 determines that there is no or lack of available downlink resources for scheduling the current user equipment UE to transmit the downlink data on the U-Cell, and determines that the downlink data transmission by the network equipment is performed by the authorized cell L-Cell;

The transceiver module 1801 is further configured to: receive the downlink data transmission that is re-executed by the network device by using the L-Cell.

Optionally, the processing module 1802 is specifically configured to: determine, by the L-Cell, the initial transmission and retransmission of the downlink data by the receiving network device;

The transceiver module 1801 is specifically configured to: receive initial transmission and retransmission of the downlink data by the network device through the L-Cell.

Optionally, the transceiver module 1801 is specifically configured to:

The initial transmission and retransmission of the downlink data by the network device through the HARQ process Y of the U-Cell.

Optionally, the transceiver module 1801 is further configured to: receive the cross-HARQ entity/cross-cell transmission configuration information sent by the network device, before receiving, by the network device, the initial transmission and the retransmission of the downlink data by the HARQ process Y of the U-Cell. ;

The processing module 1802 is further configured to: when the U-Cell has no or lack of available downlink resources for scheduling the UE to transmit the downlink data, according to the cross-HARQ entity/cross-cell transmission configuration information, the L-Cell replaces the U-Cell to perform the Initial transmission and retransmission of downlink data.

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The L-Cell is a primary cell PCell that communicates with the current UE.

Optionally, the transceiver module 1801 is further configured to: after the processing module 1802 determines initial transmission and retransmission of the downlink data by the L-Cell receiving network device, the transceiver module 1801 receives the downlink performed by the network device by using the L-Cell. Before the initial transmission and retransmission of data,

Receiving, by the network device, a first resource status indication message, where the first resource status indication message is used to indicate that the UE has no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell;

The processing module 1802 is further configured to:

After receiving the first resource status indication message, the transceiver module 1801 determines that the initial transmission and retransmission of the downlink data needs to be received from the cell that uses the licensed spectrum that communicates with the UE; or

After receiving the first resource status indication message, the transceiver module 1801 starts the first timer. If the U-Cell still does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data before the first timer expires, Determining that it is required to receive the next from the cell using the licensed spectrum that communicates with the UE. Initial transmission and retransmission of line data.

Optionally, the transceiver module 1801 is further configured to: receive a first resource status indication message sent by the network device, where the first resource status indication message is used to indicate that after the first effective time length, there is no or lack of U-Cell for Scheduling the UE to transmit available downlink resources of the downlink data;

The processing module 1802 is further configured to:

Determining, after receiving the first valid time length after receiving the first resource status indication message, the transceiver module 1801 needs to receive initial transmission and retransmission of the downlink data from a cell that uses the licensed spectrum that communicates with the UE; or

After the first valid time length after the first resource status indication message is received by the transceiver module 1801, the first timer is started. Before the first timer expires, if the U-Cell still has no or lacks for scheduling the UE transmission, The available downlink resources of the downlink data determine that the initial transmission and retransmission of the downlink data need to be received from the cell that uses the licensed spectrum that communicates with the UE.

Optionally, the processing module 1802 is further configured to: after determining initial transmission and retransmission of the downlink data, on the cell that needs to use the licensed spectrum that communicates with the UE,

Clear the cache of the HARQ process Y on the U-Cell.

Optionally, the transceiver module 1801 is further configured to:

And receiving, by the network device, a second resource status indication message, where the second resource status indication message is used to indicate that the UE has an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell;

The processing module 1802 is further configured to:

After receiving the second resource status indication message, the transceiver module 1801 determines that the downlink data needs to be received from the U-Cell; or

After receiving the second resource status indication message, the transceiver module 1801 starts the second timer. After the second timer expires, if the U-Cell still has available downlink resources for scheduling the UE to transmit the downlink data, it is determined that the The downlink data is received from the U-Cell.

Optionally, the transceiver module 1801 is further configured to:

And receiving, by the network device, a second resource status indication message, where the second resource status indication message is used to indicate that, within the second valid time length, the U-Cell is configured to schedule the current UE to transmit the next Available downlink resources for row data;

The processing module 1802 is further configured to:

After the transceiver module 1801 receives the second resource status indication message, if it is determined that the second effective time length is greater than the preset resource effective time length threshold, it is determined that the downlink data needs to be received from the U-Cell.

Optionally, the transceiver module 1801 is specifically configured to:

Optionally, the transceiver module 1801 is further configured to: before receiving the retransmission of the downlink data by the network device by the HARQ process X of the L-Cell, receive configuration information of the cross-HARQ entity/cross-cell retransmission sent by the network device;

The processing module 1802 is further configured to: determine, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, that the HARQ process X of the L-Cell is replaced when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell. The HARQ process Y of the U-Cell performs retransmission of the downlink data.

Optionally, when there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data. The transmission method is preset.

Optionally, when there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data. The transmission mode is preset; the L-Cell is the primary cell PCell that communicates with the current UE.

Optionally, the transceiver module 1801 is further configured to: after receiving the downlink data transmission by the network device through the HARQ process Y of the U-Cell,

The cross-HARQ entity/cross-cell retransmission scheduling signaling is sent by the network device through the L-Cell, and the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process X;

The transceiver module 1801 is specifically configured to: receive retransmission of the downlink data on a downlink resource on the L-Cell that is scheduled by the HARQ entity/cross-cell retransmission scheduling signaling.

Optionally, the transceiver module 1801 is further configured to: receive, by the network device, configuration information that is sent across the HARQ entity/cross-cell retransmission;

The processing module 1802 is further configured to: according to the configuration information of the cross-HARQ entity/cross-cell retransmission, determine that the L-Cell replaces the U-Cell when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell. Perform retransmission of the downlink data.

Optionally, the transceiver module 1801 is further configured to: after receiving the downlink data transmission by the network device through the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell retransmission scheduling message sent by the network device by using the L-Cell. make;

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the current UE to communicate with the current UE. Retransmitting downlink data on a cell using an unlicensed spectrum that communicates with the current UE on the cell that grants the spectrum;

U-Cell logo;

ID of the HARQ process Y.

Optionally, the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are independently allocated.

Optionally, the transceiver module 1801 is further configured to: before receiving the retransmission of the downlink data by the network device through the L-Cell,

Receive U-Cell configuration information sent by the network device. The U-Cell configuration information includes:

The HARQ process identifier that the UE can use on the U-Cell; or

The range of HARQ process identifiers that the UE can use on the U-Cell; or

Optionally, the transceiver module 1801 is further configured to: after receiving the downlink data transmission by the network device through the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell retransmission scheduling message sent by the network device by using the L-Cell. The cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process Y;

The processing module 1802 is further configured to: determine, according to the received U-Cell configuration information, that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE to receive the retransmission of the downlink data from the L-Cell;

Optionally, the transceiver module 1801 is further configured to: receive, by the network device, first indication information that is sent when the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, where the first indication information is used to indicate the UE. : There is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell;

The processing module 1802 is further configured to: after the transceiver module 1801 receives the first indication information, determine:

Retransmission of the downlink data of the HARQ process Y of the U-Cell needs to be received from the cell using the licensed spectrum in communication with the current UE; or all of the U-Cell needs to be received from the cell using the licensed spectrum in communication with the current UE Retransmission of the HARQ process; or retransmission of the designated HARQ process on the U-Cell from the cell using the licensed spectrum in communication with the current UE.

Optionally, the transceiver module 1801 is further configured to: receive, by the network device, the first indication information;

The processing module 1802 is further configured to: determine, according to the first indication information:

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the downlink data of the HARQ process Y of the U-Cell needs to be received from the cell using the licensed spectrum that communicates with the current UE. Pass; or

There is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell. At the time of the source, it is required to receive retransmission of the downlink data of all HARQ processes on the U-Cell from the cell using the licensed spectrum that communicates with the current UE; or

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the downlink data of the designated HARQ process on the U-Cell needs to be received from the cell using the licensed spectrum that communicates with the current UE. pass.

Optionally, if the processing module 1802 determines that the retransmission of the downlink data of the designated HARQ process on the U-Cell needs to be received from the cell that uses the licensed spectrum that is in communication with the current UE,

Optionally, the transceiver module 1801 is further configured to receive the second indication information that is sent by the network device, where the second indication information is used to indicate that the available downlink resources for scheduling the current UE to transmit the downlink data exist on the U-Cell; Receiving the downlink data of the HARQ process Y from the U-Cell after the second indication information; or

The transceiver module 1801 is further configured to receive the second indication information that is sent by the network device, and determine, by the processing module 1802, that the U-Cell has available downlink resources for scheduling the current UE to transmit the downlink data, according to the second indication information, from the U. - The downlink data of the HARQ process Y is received on the Cell.

Optionally, the transceiver module 1801 is further configured to: after receiving the downlink data transmission performed by the network device through the L-Cell, after the timing synchronization timer TAT of the group advance time group of the U-Cell expires, if If the TAT of the TAG where the L-Cell is located does not time out, the feedback information of the retransmission of the downlink data of the HARQ process Y is sent to the network device.

Optionally, the processing module 1802 is further configured to:

Transmitting, by the transceiver module 1801, the retransmitted data of the downlink data to the HARQ entity corresponding to the U-Cell of the UE, and combining the data in the cache of the HARQ process Y of the U-Cell; or

The data in the buffer of the HARQ process Y of the U-Cell of the UE is combined with the data of the retransmission of the downlink data received by the transceiver module 1801.

Optionally, the processing module 1802 is further configured to: send the data in the buffer of the HARQ process Y of the U-Cell of the UE to the HARQ entity corresponding to the L-Cell of the UE, and retransmit the received downlink data. Before the data is merged,

When the transceiver module 1801 receives the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device through the L-Cell, the first cache of the HARQ process Y for the U-Cell of the L-Cell is established, or for the L-Cell Corresponding a first cache of the HARQ process for transmitting the retransmitted downlink data;

After receiving the retransmitted data of the downlink data, the transceiver module 1801 buffers the received retransmitted data into the established first cache.

The processing module 1802 is specifically configured to: merge the data in the cache of the HARQ process Y of the U-Cell of the UE with the retransmitted data buffered into the first cache.

Optionally, the processing module 1802 is further configured to: before the re-transmitted data of the downlink data received by the transceiver module 1801, the HARQ entity corresponding to the L-Cell receives the downlink data of the HARQ process Y of the U-Cell. Establishing a first buffer of the L-Cell for the HARQ process Y, or a first buffer for the HARQ process for transmitting the retransmission of the downlink data corresponding to the L-Cell, and receiving the received HARQ of the U-Cell The data of process Y is cached into the first cache;

The processing module 1802 is specifically configured to: when the transceiver module 1801 receives the retransmitted data of the retransmission of the HARQ process Y sent by the network device through the L-Cell, the HARQ process Y of the U-Cell received and buffered in the first cache The data is combined with the retransmitted data of the received retransmission.

Optionally, the processing module 1802 is further configured to:

After the data in the buffer of the HARQ process Y of the U-Cell of the UE is combined with the data of the retransmission of the downlink data received by the transceiver module 1801, the buffer of the HARQ process Y corresponding to the U-Cell of the current UE is cleared. data.

FIG. 19 is a schematic structural diagram of a fourth user equipment according to an embodiment of the present invention. As shown in FIG. 19, the user equipment includes:

The transceiver 1901 is configured to receive, by the network device, the downlink data transmission by the hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

The processor 1902 determines that there is no or lack of available downlink resources for scheduling the current user equipment UE to transmit the downlink data on the U-Cell, and determines that the network device is received by the authorized cell L-Cell. The transmission of the downlink data;

The transceiver 1901 is further configured to: receive, by the network device, the transmission of the downlink data that is performed by the L-Cell.

For other optional implementations of the transceiver 1901, reference may be made to the transceiver module 1801. Other optional implementations of the processor 1902 may refer to the processor 1802. For other optional implementation details of the UE, refer to the foregoing user equipment 202, and repeat I won't go into details here.

FIG. 20 is a flowchart of a first downlink data transmission method according to an embodiment of the present invention. As shown in FIG. 20, the method includes the following steps:

S2001: Perform an initial transmission of downlink data to the user equipment UE by using a hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

S2002: Determine a retransmission mode of the downlink data, perform retransmission by the authorized cell L-Cell, and perform retransmission of the downlink data to the UE by using the L-Cell.

Optionally, before performing the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

The cross-HARQ entity/cross-cell transmission configuration information is sent to the UE, and the cross-HARQ entity/cross-cell transmission configuration information is used to indicate that the UE retransmits the downlink data by using the L-Cell.

Optionally, after the initial transmission of the downlink data to the UE by the HARQ process Y of the U-Cell, the method further includes:

Retransmitting the downlink data to the UE through the L-Cell, including:

Retransmitted indication information;

U-Cell logo; and

ID of the HARQ process Y.

Optionally, before the initial transmission of the downlink data to the UE by using the HARQ process Y of the U-Cell, the method further includes:

The U-Cell sends the cross-carrier scheduling signaling to the UE, where the cross-carrier scheduling signaling is used to instruct the UE to receive the initial transmission of the downlink data from the HARQ process Y on the U-Cell;

The initial transmission of the downlink data is performed to the UE by the HARQ process Y of the U-Cell, including: performing initial transmission of the downlink data to the UE on the downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling.

Optionally, the cross-carrier scheduling signaling includes:

Initial transmission indication information;

U-Cell logo; and

ID of the HARQ process Y.

Optionally, after performing the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

After determining the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, if the TAT of the TAG where the L-Cell is located does not time out, the UE waits for feedback information about the retransmission of the downlink data sent by the UE.

For other optional implementation details of the method, reference may be made to the implementation of the foregoing network device 201, and the repeated description is not repeated.

FIG. 21 is a flowchart of a second downlink data transmission method according to an embodiment of the present invention. As shown in FIG. 21, the method includes the following steps:

S2101: The hybrid automatic retransmission request HARQ process Y is performed by the unlicensed cell U-Cell, and the downlink data is transmitted to the user equipment UE.

S2102: Determine that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, and determine that the downlink data is retransmitted to the UE by using the authorized cell L-Cell.

S2103: Retransmit the downlink data to the UE by using the L-Cell.

Optionally, determining, by using the L-Cell, retransmitting the downlink data to the UE, including: determining, by using the L-Cell, performing initial transmission and retransmission of the downlink data to the UE;

The downlink data is retransmitted to the UE through the L-Cell, including:

The initial transmission and retransmission of the downlink data are performed to the UE through the L-Cell.

Optionally, performing downlink data transmission to the UE by using the HARQ process Y of the U-Cell, including:

Optionally, before the initial transmission and retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

Optionally, after determining, by the L-Cell, the initial transmission and the retransmission of the downlink data by using the L-Cell, before the initial transmission and retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

After the first effective time length, there is no or lack of U-Cell for scheduling the UE to transmit the downlink. Available downstream resources for the data.

Optionally, it also includes:

When there is an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, the second resource status indication message is sent to the UE, where the second resource status indication message is used to indicate the UE:

Optionally, the downlink data transmission is performed to the UE by using the L-Cell, including:

The downlink data is retransmitted to the UE through the L-Cell.

Optionally, performing retransmission of the downlink data to the UE by using the L-Cell, including:

Optionally, before performing the retransmission of the downlink data to the UE by using the HARQ process X of the L-Cell, the method further includes:

Optionally, after performing the downlink data transmission to the UE by using the HARQ process Y of the U-Cell, the method further includes:

The identifier of the HARQ process X is used to indicate that the UE performs the retransmission transmission mode of the downlink data according to the HARQ process X of the L-Cell instead of the HARQ process Y of the U-Cell, and the retransmission scheduling signaling is performed across the HARQ entity/cross-cell. The scheduled retransmission data of the downlink data is merged with the downlink data on the HARQ process Y on the U-Cell;

Performing the retransmission of the downlink data to the UE by using the HARQ process X of the L-Cell, including: performing the downlink data to the UE on the downlink resource on the L-Cell that is scheduled across the HARQ entity/cross-cell retransmission scheduling signaling Retransmission.

Transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, and the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE has no or lack of available downlink for scheduling the UE to transmit the downlink data on the U-Cell. When the resource is used, the L-Cell replaces the U-Cell to perform retransmission of the downlink data.

The retransmission of the downlink data to the UE by using the L-Cell includes: performing retransmission of the downlink data to the UE on the downlink resource on the L-Cell that is scheduled by the HARQ entity/cross-cell retransmission scheduling signaling.

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE to use the licensed spectrum from the UE to communicate with the UE. On a cell that receives communication with the UE using an unlicensed spectrum Retransmission of the downlink data;

U-Cell logo;

ID of the HARQ process Y.

The HARQ process identifier that the UE can use on the U-Cell; or

The range of HARQ process identifiers that the UE can use on the U-Cell; or

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

An identifier of the HARQ process Y, instructing the UE to determine, according to the received U-Cell configuration information, that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE to receive the retransmission of the downlink data from the L-Cell;

The L-Cell performs retransmission of the downlink data to the UE, including performing retransmission of the downlink data to the UE on the downlink resource on the L-Cell that is scheduled across the HARQ entity/cross-cell retransmission scheduling signaling.

Optionally, it also includes:

The UE needs to receive all of the U-Cells from the cell using the licensed spectrum that communicates with the UE. Retransmission of the downlink data of the HARQ process; or

Optionally, the method further includes: sending, to the UE, first indication information, where the first indication information is used to indicate the UE:

Optionally, it also includes:

After determining the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, if If the TAT of the TAG where the L-Cell is located does not time out, the UE waits for feedback information about the retransmission of the downlink data sent by the UE.

FIG. 22 is a flowchart of a third downlink data transmission method according to an embodiment of the present invention. As shown in FIG. 22, the method includes the following steps:

S2201: The initial transmission of the downlink data sent by the receiving network device by the hybrid automatic repeat request of the unlicensed cell U-Cell to the HARQ process Y;

S2202: Determine that the retransmission mode of the downlink data is retransmission by the authorized cell L-Cell; and receive retransmission of the downlink data by the network device by using the L-Cell.

Optionally, before receiving the retransmission of the downlink data by the network device by using the L-Cell, the method further includes:

The cross-HARQ entity/cross-cell transmission configuration information sent by the network device is received, and the retransmission mode of the downlink data is determined to be retransmitted by the L-Cell according to the received cross-HARQ entity/cross-cell transmission configuration information.

Optionally, the retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, and the L-Cell is a primary cell PCell that communicates with the current UE.

Optionally, after the initial transmission of the downlink data sent by the network device by the HARQ process Y of the U-Cell, the method further includes:

Receiving, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, and determining, according to the received cross-HARQ entity/cross-cell retransmission scheduling signaling, that the retransmission of the downlink data is received from the L-Cell;

The retransmission of the downlink data by the receiving network device by the L-Cell includes: receiving the retransmission of the downlink data on the downlink resource on the L-Cell that is scheduled across the HARQ entity/cross-cell retransmission scheduling signaling.

Retransmitted indication information;

U-Cell logo; and

ID of the HARQ process Y.

Optionally, before the initial transmission of the downlink data sent by the network device through the HARQ process Y of the U-Cell, the method further includes:

Receiving, by the network device, the cross-carrier scheduling signaling sent by the U-Cell, and determining, according to the received cross-carrier scheduling signaling, the initial transmission of the downlink data from the HARQ process Y on the U-Cell;

The initial transmission of the downlink data sent by the network device through the HARQ process Y of the U-Cell includes: receiving the initial transmission of the downlink data on the downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling.

Optionally, the cross-carrier scheduling signaling includes:

Initial transmission indication information;

U-Cell logo; and

ID of the HARQ process Y.

Optionally, after receiving the retransmission of the downlink data by the network device by using the L-Cell, the method further includes:

After the timing synchronization timer TAT of the TAG of the group TAG is timed out, the TAT of the TAG where the L-Cell is located does not time out, and the feedback information about the retransmission of the downlink data is sent to the network device.

Optionally, it also includes:

And transmitting the retransmitted data of the downlink data to the HARQ entity corresponding to the U-Cell of the current UE, and combining the data in the cache of the HARQ process Y of the U-Cell; or

The data in the buffer of the HARQ process Y of the U-Cell of the current UE is sent to the HARQ entity corresponding to the L-Cell of the current UE, and is merged with the retransmitted data of the received downlink data.

Optionally, before merging with the retransmitted data of the received downlink data, the method further includes:

Establishing a first cache of the HARQ process Y of the L-Cell for the U-Cell, or for the L-Cell, when receiving the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device through the L-Cell Corresponding a first cache of the HARQ process for transmitting the retransmitted downlink data;

After receiving the retransmitted data of the downlink data, buffering the received retransmitted data into the first cache that is established;

Merging with the retransmitted data of the received downlink data includes merging with the retransmitted data received and buffered into the first buffer.

When the downlink data of the HARQ process Y of the U-Cell is received by the HARQ entity corresponding to the L-Cell, the first buffer of the L-Cell for the HARQ process Y is established, or the downlink data corresponding to the L-Cell is used for transmitting the downlink data. Retransmitting the first cache of the HARQ process, and buffering the received data of the U-Cell HARQ process Y into the first cache;

Merging with the retransmitted retransmitted data of the received re-transmission data, including: receiving the retransmitted data of the HARQ process Y transmitted by the network device through the L-Cell, and receiving and buffering the U-Cell in the first cache The data of the HARQ process Y is merged with the retransmitted data of the received retransmission.

Optionally, after the data in the cache of the HARQ process Y of the U-Cell of the current UE is sent to the HARQ entity corresponding to the L-Cell of the current UE, the method further includes:

The data in the cache of the HARQ process Y corresponding to the U-Cell of the current UE is cleared.

For other optional implementation details of the method, reference may be made to the foregoing user equipment 202, and the repetition is not described herein.

FIG. 23 is a flowchart of a fourth downlink data transmission method according to an embodiment of the present invention. As shown in FIG. 23, the method includes the following steps:

S2301: The downlink data transmission performed by the hybrid network automatic retransmission request HARQ process Y by the receiving network device by the unlicensed cell U-Cell;

S2302: It is determined that there is no or lack of available downlink resources for scheduling the current user equipment UE to transmit the downlink data on the U-Cell, and determining that the downlink data transmission by the network equipment is performed by the authorized cell L-Cell;

S2303: Receive the downlink data transmission that is performed by the network device through the L-Cell.

Optionally, determining, by using the L-Cell, receiving, by the network device, the downlink data transmission, The method includes: determining, by the L-Cell, initial transmission and retransmission of the downlink data by the receiving network device;

Receiving the downlink data transmission performed by the network device through the L-Cell, including:

Optionally, the receiving, by the network device, the downlink data transmission by the HARQ process Y of the U-Cell, including:

Optionally, before the initial transmission and retransmission of the downlink data by the network device through the HARQ process Y of the U-Cell, the method further includes:

Receiving the cross-HARQ entity/cross-cell transmission configuration information sent by the network device, and determining, according to the cross-HARQ entity/cross-cell transmission configuration information, that there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, The L-Cell replaces the U-Cell for initial transmission and retransmission of the downlink data.

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. of.

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The L-Cell is the primary cell PCell that communicates with the current UE.

Optionally, after determining, by the L-Cell, the initial transmission and the retransmission of the downlink data by the receiving network device, before the initial transmission and retransmission of the downlink data by the network device by using the L-Cell, the method further includes:

Receiving a first resource status indication message sent by the network device, where the first resource status indication message is used to indicate that the current UE has no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell:

After receiving the first resource status indication message, determining that an initial transmission and retransmission of the downlink data needs to be received from a cell that uses the licensed spectrum that communicates with the current UE; or

After receiving the first resource status indication message, the first timer is started, and if the U-Cell still has no or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the first timer expires. The initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum in communication with the current UE.

Optionally, the method further includes: receiving, by the network device, a first resource status indication message, where the first resource status indication message is used to indicate that, after the first effective time length, there is no or lack of U-Cell for scheduling the current UE transmission. Available downlink resources of the downlink data;

After the first valid time length after receiving the first resource status indication message, the first timer is started, and if the U-Cell still has no or lacking for scheduling the current UE to transmit the downlink data before the first timer expires The available downlink resources determine that the initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum that communicates with the current UE.

Optionally, after determining the initial transmission and retransmission of the downlink data on the cell that needs to use the licensed spectrum that is in communication with the current UE, the method further includes:

Clear the cache of the HARQ process Y on the U-Cell.

Optionally, it also includes:

After the second resource status indication message is received, the second timer is started. After the second timer expires, if there is still available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to be determined from the U. -Cell receives the downlink data.

Optionally, it also includes:

And receiving, by the network device, a second resource status indication message, where the second resource status indication message is used to indicate that, within the second valid time length, the U-Cell has an available downlink resource for scheduling the current UE to transmit the downlink data;

After receiving the second resource status indication message, if it is determined that the second effective time length is greater than a preset resource effective time length threshold, it is determined that the downlink data needs to be received from the U-Cell.

Optionally, the receiving, by the L-Cell, the retransmission of the downlink data by the network device, including:

Optionally, the retransmitting of the downlink data by the receiving network device by using the L-Cell includes:

Optionally, before receiving the retransmission of the downlink data by the network device through the HARQ process X of the L-Cell, the method further includes:

Receiving the configuration information of the cross-HARQ entity/cross-cell retransmission sent by the network device, determining, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, that there is no or lack of available on the U-Cell for scheduling the current UE to transmit the downlink data. When the downlink resource is used, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.

Optionally, after receiving the downlink data transmission by the network device through the HARQ process Y of the U-Cell, the method further includes:

Receiving retransmission of the downlink data by the network device through the HARQ process X of the L-Cell, the packet The retransmission of the downlink data is received on the downlink resource on the L-Cell that is scheduled by the HARQ entity/cross-cell retransmission scheduling signaling.

Receiving, by the network device, the configuration information of the cross-HARQ entity/cross-cell retransmission, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, determining that there is no or lack of the U-Cell for scheduling the current UE to transmit the downlink data. When the downlink resource is available, the L-Cell replaces the U-Cell to perform retransmission of the downlink data.

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform the retransmission of the downlink data by using a preset manner.

Optionally, when the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform the retransmission of the downlink data by using a preset manner; -Cell is the primary cell PCell that communicates with the current UE.

Receiving cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device through the L-Cell;

U-Cell logo;

ID of the HARQ process Y.

The HARQ process identifier that the current UE can use on the U-Cell; or

Optionally, after the receiving, by the network device, the downlink data transmission by the HARQ process Y of the U-Cell, the method further includes:

The cross-HARQ entity/cross-cell retransmission scheduling signaling is sent by the network device through the L-Cell, and the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process Y;

Determining, by the received U-Cell configuration information, a cross-HARQ entity/cross-cell retransmission scheduling signaling, configured to schedule a current UE to receive the retransmission of the downlink data from the L-Cell;

Optionally, it also includes:

The first indication information sent by the receiving network device when the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, where the first indication information is used to indicate that the current UE: is not available or lacking on the U-Cell An available downlink resource used for scheduling the current UE to transmit the downlink data;

After receiving the first indication information, determining that retransmission of the downlink data of the HARQ process Y of the U-Cell needs to be received from the cell using the licensed spectrum that communicates with the current UE; or that the licensed spectrum needs to be communicated from the current UE Receiving retransmission of all HARQ processes on the U-Cell on the cell; or receiving a designation on the U-Cell from the cell using the licensed spectrum in communication with the current UE Retransmission of the HARQ process.

Optionally, it also includes:

Receiving, by the network device, the first indication information;

According to the first indication information, it is determined:

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, it is required to receive the downlink data of all HARQ processes on the U-Cell from the cell using the licensed spectrum that communicates with the current UE. Retransmission; or

Optionally, if it is determined that the retransmission of the downlink data of the designated HARQ process on the U-Cell needs to be received from the cell that uses the licensed spectrum that is in communication with the current UE,

Optionally, it also includes:

The second indication information sent by the network device is received, where the second indication information is used to indicate that there is an available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell; and after receiving the second indication information, the U- The Cell receives the downlink data of the HARQ process Y; or

Receiving the second indication information sent by the network device, and determining, according to the second indication information, that when the U-Cell has an available downlink resource for scheduling the current UE to transmit the downlink data, the downlink of the HARQ process Y is received from the U-Cell. data.

Optionally, after the receiving, by the L-Cell, the retransmission of the downlink data by the network device, the method further includes:

After the timing synchronization timer TAT of the TAG of the group is advanced, the TAT of the TAG where the L-Cell is located does not time out, and the HARQ process Y is sent to the network device. Feedback information of retransmission of downlink data.

Optionally, it also includes:

Establishing a first buffer of the HARQ process Y of the L-Cell for the U-Cell, or for the corresponding L-Cell, when receiving the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device through the L-Cell Transmitting a first cache of the retransmitted HARQ process of the downlink data;

For other optional implementation details of the method, reference may be made to the foregoing implementation of the user equipment 202, and the repeated description is not repeated.

In summary, in the embodiment of the present invention, a network device, such as a base station, transmits downlink data to a UE by using an unlicensed cell U-Cell of an unlicensed spectrum, and retransmits to the UE by using an authorized cell L-Cell of the licensed spectrum. The downlink data or the retransmission of the downlink data to the UE avoids the problem that the delay of a part of the data packets transmitted on the unlicensed spectrum is excessive when the resources are not available on the unlicensed spectrum.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device to produce a machine for the production of instructions by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for use on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A network device, comprising:

a transceiver module, configured to perform initial transmission of downlink data to the user equipment UE by using a hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

a processing module, configured to determine that the retransmission mode of the downlink data is retransmission by using an authorized cell L-Cell;

The transceiver module is further configured to: perform retransmission of the downlink data to the UE by using the L-Cell.
The network device according to claim 1, wherein the transceiver module is further configured to:

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell transmission configuration information to the UE before performing retransmission of the downlink data to the UE, where the cross-HARQ entity/cross-cell transmission configuration information is used for And indicating that the downlink data of the UE is retransmitted by using an L-Cell.
The network device of claim 1 wherein:

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset.
The network device of claim 1 wherein:

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, and the L-Cell is a primary cell PCell that communicates with the UE.
The network device according to any one of claims 2 to 4, wherein the transceiver module is further configured to:

After performing initial transmission of downlink data to the UE through the HARQ process Y of the U-Cell, transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE, the cross-HARQ entity/ Trans-cell retransmission scheduling signaling is used to instruct the UE to receive retransmission of the downlink data from the L-Cell;

The transceiver module is specifically configured to:

Retransmitting the downlink data to the UE on the downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.
The network device according to claim 5, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

Retransmitted indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.
The network device according to claim 5 or 6, wherein the transceiver module is further configured to:

Transmitting the cross-carrier scheduling signaling to the UE by using the U-Cell, before the initial transmission of the downlink data to the UE by the HARQ process Y of the U-Cell, where the cross-carrier scheduling signaling is used to indicate the Receiving, by the UE, an initial transmission of the downlink data from a HARQ process Y on the U-Cell;

The transceiver module is specifically configured to: perform initial transmission of the downlink data to the UE on a downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling.
The network device according to claim 7, wherein the cross-carrier scheduling signaling includes:

Initial transmission indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.
The network device according to any one of claims 1 to 8, wherein the transceiver module is further configured to: perform, by the transceiver module, the weight of the downlink data to the UE by using the L-Cell After the pass,

Before determining that the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, the feedback information for the retransmission of the downlink data sent by the UE is not received;

After determining that the timing synchronization timer TAT of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, waiting for receiving the weight of the downlink data sent by the UE Feedback information.
A network device, comprising:

a transceiver module, configured to perform downlink data transmission to the user equipment UE by using a hybrid automatic retransmission request HARQ process Y of the unlicensed cell U-Cell;

a processing module, configured to determine, on the U-Cell, that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data, and determining to perform the downlink data to the UE by using an authorized cell L-Cell Transmission

The transceiver module is further configured to: perform retransmission of the downlink data to the UE by using the L-Cell.
A network device according to claim 10, wherein

The processing module is specifically configured to: determine, by using the L-Cell, initial transmission and retransmission of the downlink data to the UE

The transceiver module is specifically configured to: perform initial transmission and retransmission of the downlink data to the UE by using the L-Cell.
The network device according to claim 11, wherein the transceiver module is specifically configured to:

Performing initial transmission and retransmission of the downlink data to the UE through the HARQ process Y of the U-Cell.
The network device according to claim 11 or 12, wherein the transceiver module is further configured to: before performing initial transmission and retransmission of the downlink data to the UE by using an L-Cell,

Transmitting, by the UE, cross-HARQ entity/cross-cell transmission configuration information, where the cross-HARQ entity/cross-cell transmission configuration information is used to indicate that the UE has no or lack of scheduling for the UE transmission on the U-Cell When the downlink resource of the downlink data is available, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data.
A network device according to claim 11 or 12, characterized in that

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission method is preset.
A network device according to claim 11 or 12, characterized in that

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission mode is preset, and the L-Cell is a primary cell PCell that communicates with the UE.
The network device according to any one of claims 13 to 15, wherein the transceiver module is further configured to: after the processing module determines to perform the downlink data to the UE by using an authorized cell L-Cell After the initial transmission and the retransmission, the transceiver module performs the initial transmission and retransmission of the downlink data to the UE by using the L-Cell.

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, sending a first resource status indication message to the UE, where the first resource status indication message is used to indicate The UE:

There is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell; or

After the first effective time length, there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.
The network device according to claim 16, wherein the transceiver module is further configured to:

And when the U-Cell is configured to send the second downlink resource status indication message to the UE, where the second resource status indication message is used to indicate that the UE is configured to transmit the downlink data. UE:

An available downlink resource for scheduling the UE to transmit the downlink data exists on the U-Cell; or

Within the second effective time length, there are available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.
A network device according to claim 10, wherein

The transceiver module is specifically configured to: when retransmitting the downlink data to the UE by using the L-Cell:

Retransmitting the downlink data to the UE by using the L-Cell.
The network device according to claim 18, wherein the transceiver module is specifically configured to:

Retransmitting the downlink data to the UE by using the HARQ process X of the L-Cell.
The network device according to claim 19, wherein the transceiver module is further configured to: before performing the retransmission of the downlink data to the UE by using the HARQ process X of the L-Cell,

And transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, where the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE has no or lack of scheduling on the U-Cell. When the UE transmits the available downlink resources of the downlink data, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.
A network device according to claim 19, wherein

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink The transmission method of data retransmission is preset.
A network device according to claim 19, wherein

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink The transmission mode of retransmission of data is preset; the L-Cell is a primary cell PCell that communicates with the UE.
The network device according to any one of claims 20 to 22, wherein the transceiver module is further configured to: after transmitting the downlink data to the UE through the HARQ process Y of the U-Cell,

Transmitting the HARQ entity/cross-cell retransmission scheduling signaling to the UE by using the L-Cell, where the cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the HARQ process X is used to indicate that the UE performs the retransmission transmission mode of the downlink data according to the HARQ process X of the L-Cell instead of the HARQ process Y of the U-Cell, and the cross Number of retransmissions of the downlink data scheduled by HARQ entity/cross-cell retransmission scheduling signaling According to the downlink data merged with the HARQ process Y of the U-Cell;

The transceiver module is specifically configured to perform retransmission of the downlink data to the UE on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.
The network device according to claim 18, wherein the transceiver module is further configured to: before the retransmission of the downlink data to the UE by using the L-Cell,

And transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, where the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE: the L-Cell replaces the U-Cell Retransmission of downlink data.
A network device according to claim 18, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. default.
A network device according to claim 18, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. Preset; the L-Cell is a primary cell PCell that communicates with the UE.
A network device according to any one of claims 24 to 26, characterized in that

The transceiver module is further configured to: after the downlink data transmission to the UE by using the HARQ process Y of the U-Cell:

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE, where the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to indicate that the UE is from the L-Cell Receiving retransmission of the downlink data;

The transceiver module is specifically configured to perform retransmission of the downlink data to the UE on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.
The network device according to claim 27, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE from Retransmitting the downlink data on a cell using an unlicensed spectrum that communicates with the UE on a cell that uses the licensed spectrum that is communicated by the UE;

The identifier of the U-Cell;

The identifier of the HARQ process Y.
The network device according to any one of claims 24 to 28, wherein the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are independently allocated.
A network device according to claim 18, wherein

The transceiver module is further configured to: before the retransmission of the downlink data to the UE by using the L-Cell,

Sending U-Cell configuration information to the UE, where the U-Cell configuration information includes:

The HARQ process identifier that the UE can use on the U-Cell; or

a range of HARQ process identifiers that the UE can use on the U-Cell; or

The initial HARQ process identifier in the HARQ process identifier that the UE can use on the U-Cell.
The network device according to claim 30, wherein the transceiver module is further configured to: after transmitting the downlink data to the UE through the HARQ process Y of the U-Cell,

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the HARQ process Y;

The transceiver module is specifically configured to perform retransmission of the downlink data to the UE on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.
The network device according to claim 30 or 31, wherein the identifier of the HARQ process of the L-Cell is different from the identifier of the HARQ process of the U-Cell.
The network device according to any one of claims 18 to 32, wherein the transceiver module The block is also used to:

When the U-Cell has no or no available downlink resources for scheduling the UE to transmit the downlink data, the first indication information is sent to the UE, where the first indication information is used to indicate the UE:

The UE needs to receive retransmission of the downlink data of the HARQ process Y of the U-Cell from a cell using the licensed spectrum that communicates with the UE; or

The UE needs to receive retransmission of the downlink data of all HARQ processes on the U-Cell from a cell using the licensed spectrum that communicates with the UE; or

The UE needs to receive retransmission of the downlink data of the designated HARQ process on the U-Cell from a cell using the licensed spectrum that communicates with the UE.
The network device according to any one of claims 18 to 32, wherein the transceiver module is further configured to send first indication information to the UE, where the first indication information is used to indicate the UE:

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of the HARQ process Y; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of all HARQ processes on; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of the specified HARQ process.
The network device according to claim 33 or 34, wherein the first indication information is used to indicate that the UE needs to receive the UE from a cell that uses a licensed spectrum that communicates with the UE. Retransmission of the downlink data of the designated HARQ process on the U-Cell,

The first indication information includes: identifier information of the specified HARQ process.
The network device according to any one of claims 33 to 35, wherein the transceiver module is further configured to:

When the U-Cell has an available downlink resource for scheduling the UE to transmit the downlink data, the second indication information is sent to the UE, where the second indication information is used to indicate the UE: The U-Cell receives the downlink data of the HARQ process Y; or

Transmitting, to the UE, second indication information, where the second indication information is used to indicate that the UE: when there is available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, The U-Cell receives the downlink data of the HARQ process Y.
The network device according to any one of claims 18 to 36, wherein the transceiver module is further configured to: after performing the retransmission of the downlink data to the UE by using the L-Cell,

Before determining that the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, the feedback information for the retransmission of the downlink data sent by the UE is not received;

After determining that the timing synchronization timer TAT of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, waiting for receiving the weight of the downlink data sent by the UE Feedback information.
A user equipment (UE), comprising:

a transceiver module, configured to receive initial transmission of downlink data sent by the network device through the hybrid automatic repeat request of the unlicensed cell U-Cell, the HARQ process Y;

a processing module, configured to determine that the retransmission mode of the downlink data is retransmission by using an authorized cell L-Cell;

The transceiver module is further configured to: receive retransmission of the downlink data by the network device by using the L-Cell.
The UE of claim 38, wherein

The transceiver module is further configured to: before receiving the retransmission of the downlink data by the network device by using the L-Cell, receive cross-HARQ entity/cross-cell transmission configuration information sent by the network device;

The processing module is specifically configured to: according to the cross-HARQ entity/cross-cell transmission configuration information received by the transceiver module, determine that the retransmission mode of the downlink data is retransmission by using an L-Cell.
The UE of claim 38, wherein

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset.
The UE of claim 38, wherein

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, and the L-Cell is a primary cell PCell that communicates with the UE.
The UE according to any one of claims 39 to 41, characterized in that

The transceiver module is further configured to: after receiving the initial transmission of the downlink data sent by the network device by the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell retransmission sent by the network device by using the L-Cell Scheduling signaling;

The processing module is further configured to: determine, according to the cross-HARQ entity/cross-cell retransmission scheduling signaling received by the transceiver module, to receive retransmission of the downlink data from the L-Cell;

The transceiver module is specifically configured to: receive retransmission of the downlink data on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.
The UE according to claim 42, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

Retransmitted indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.
The UE according to claim 42 or 43, wherein

The transceiver module is further configured to: before receiving the initial transmission of the downlink data sent by the network device by the HARQ process Y of the U-Cell, receive the cross-carrier scheduling signaling sent by the network device by using the U-Cell;

The processing module is further configured to: determine, according to the received cross-carrier scheduling signaling, an initial transmission that receives the downlink data from a HARQ process Y on the U-Cell;

The transceiver module is specifically configured to: receive initial transmission of the downlink data on a downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling.
The UE according to claim 44, wherein the cross-carrier scheduling signaling includes:

Initial transmission indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.
The UE according to any one of claims 38 to 45, characterized in that

The processing module is further configured to: after the transceiver module receives the retransmission of the downlink data by the network device by using the L-Cell, determine timing synchronization of a time advance group TAG where the U-Cell is located Whether the timer TAT has timed out, and whether the TAT of the TAG where the L-Cell is located has timed out;

The transceiver module is further configured to: after the processing module determines that the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located expires, if the processing module determines the TAT of the TAG where the L-Cell is located If there is no timeout, the feedback information for the retransmission of the downlink data is sent to the network device.
The UE according to any one of claims 42 to 45, wherein the processing module is further configured to:

Merging the retransmitted data of the downlink data received by the transceiver module with data in a cache of the HARQ process Y of the U-Cell; or

And synthesizing data in the cache of the HARQ process Y of the U-Cell of the UE with data of retransmission of the downlink data received by the transceiver module.
The UE according to claim 47, wherein the processing module is further configured to: before combining the retransmitted data of the downlink data received by the transceiver module,

Establishing, by the transceiver module, the HARQ process for the U-Cell of the L-Cell when the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device by using the L-Cell is received by the network device a first buffer of Y, or a first buffer corresponding to the L-Cell corresponding to a HARQ process for transmitting a retransmission of the downlink data;

After the transceiver module receives the retransmitted data of the downlink data, buffering the retransmitted data received by the transceiver module into the established first cache;

The processing module is specifically configured to: merge data in a cache of the HARQ process Y of the U-Cell of the UE with retransmitted data buffered in the first cache.
The UE of claim 47, wherein

The processing module is further configured to: before combining the retransmitted data of the downlink data received by the transceiver module,

When the downlink data corresponding to the HARQ process Y of the U-Cell is received by the HARQ entity corresponding to the L-Cell, establishing a first cache of the L-Cell for the HARQ process Y, or for And the L-Cell corresponding to the first buffer of the HARQ process for transmitting the retransmission of the downlink data, and buffering, by the transceiver module, the data of the HARQ process Y of the U-Cell to the In the first cache;

The processing module is specifically configured to: when the transceiver module receives the retransmitted retransmission data of the HARQ process Y sent by the network device by using the L-Cell, the processing module receives and caches the retransmitted data. The data of the HARQ process Y of the U-Cell in the first cache is merged with the received retransmitted retransmission data.
The UE according to any one of claims 47 to 49, wherein the processing module is further configured to:

After the data in the cache of the HARQ process Y of the U-Cell of the UE is merged with the data of the retransmission of the downlink data received by the transceiver module, the U of the UE is cleared. -Cell data in the cache of the HARQ process Y corresponding to the Cell.
A user equipment (UE), comprising:

a transceiver module, configured to receive downlink data transmission by the hybrid automatic retransmission request HARQ process Y of the network device through the unlicensed cell U-Cell;

The processing module determines that the U-Cell does not have or lacks available downlink resources for scheduling the current user equipment UE to transmit the downlink data, and determines that the downlink that is performed by the network equipment is received by the authorized cell L-Cell. Transmission of data;

The transceiver module is further configured to: receive the re-executed by the network device by using the L-Cell The transmission of downlink data.
The UE of claim 51, wherein

The processing module is specifically configured to: determine, by using the L-Cell, the initial transmission and retransmission of the downlink data by the network device;

The transceiver module is specifically configured to: receive initial transmission and retransmission of the downlink data by the network device by using the L-Cell.
The UE according to claim 52, wherein the transceiver module is specifically configured to:

Receiving initial transmission and retransmission of the downlink data by the network device through the HARQ process Y of the U-Cell.
The UE according to claim 52 or 53, wherein

The transceiver module is further configured to: before receiving the initial transmission and retransmission of the downlink data by the network device by using the HARQ process Y of the U-Cell, receiving a cross-HARQ entity/span sent by the network device Cell transmission configuration information;

The processing module is further configured to: determine, according to the cross-HARQ entity/cross-cell transmission configuration information, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, The L-Cell replaces the U-Cell for initial transmission and retransmission of the downlink data.
The UE according to claim 52 or 53, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission method is preset.
The UE according to claim 52 or 53, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission mode is preset, and the L-Cell is a primary cell PCell that communicates with the current UE.
The UE according to any one of claims 54 to 56, wherein the transceiver module is further configured to: determine, by the processing module, that the downlink is performed by the network device by using the L-Cell After the initial transmission and retransmission of the data, the transceiver module receives the initial transmission and retransmission of the downlink data by the network device through the L-Cell,

Receiving, by the network device, a first resource status indication message, where the first resource status indication message is used to indicate that the UE is not configured on the U-Cell to schedule the UE to transmit the downlink data. Available downlink resources;

The processing module is further configured to:

After receiving the first resource status indication message, the transceiver module determines that an initial transmission and retransmission of the downlink data needs to be received from a cell that uses the licensed spectrum that communicates with the UE; or

After the receiving, by the transceiver module, the first resource status indication message, start the first timer, if the U-Cell is still absent or lacking for scheduling the UE before the first timer expires Transmitting the available downlink resources of the downlink data, determining that an initial transmission and retransmission of the downlink data needs to be received from a cell that uses the licensed spectrum that communicates with the UE.
The UE according to any one of claims 54 to 56, wherein the transceiver module is further configured to: receive a first resource status indication message sent by the network device, where the first resource status indication message is used Instructing: after the first effective time length, there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell;

The processing module is further configured to:

Determining, after the first valid time length after receiving the first resource status indication message, that the transceiver module needs to receive initial transmission and weight of the downlink data from a cell that uses the licensed spectrum that communicates with the UE. Pass; or

After the first valid time length after the first resource status indication message is received by the transceiver module, the first timer is started, and if the first timer expires, if the U-Cell is still not available or In the absence of available downlink resources for scheduling the UE to transmit the downlink data, it is determined that an initial transmission and retransmission of the downlink data needs to be received from a cell using the licensed spectrum that communicates with the UE.
The UE according to claim 57 or 58, wherein the processing module is further configured to: at the beginning of receiving the downlink data on a cell that needs to use a licensed spectrum for communication with the UE After the transmission and retransmission,

Clearing the cache of the HARQ process Y on the U-Cell.
The UE according to any one of claims 57 to 59, wherein the transceiver module is further configured to:

Receiving a second resource status indication message sent by the network device, where the second resource status indication message is used to indicate that the UE has an available downlink for scheduling the UE to transmit the downlink data on the U-Cell. Resource

The processing module is further configured to:

After receiving, by the transceiver module, the second resource status indication message, determining that the downlink data needs to be received from the U-Cell; or

After the transceiver module receives the second resource status indication message, the second timer is started, and after the second timer expires, if the U-Cell still exists for scheduling the UE to transmit the The available downlink resources of the downlink data determine that the downlink data needs to be received from the U-Cell.
The UE according to any one of claims 57 to 59, characterized in that

The transceiver module is further configured to:

Receiving, by the network device, a second resource status indication message, where the second resource status indication message is used to indicate that, within the second valid time length, the U-Cell is configured to schedule the current UE to transmit the Available downlink resources for downlink data;

The processing module is further configured to:

After the transceiver module receives the second resource status indication message, if it is determined that the second effective time length is greater than a preset resource effective time length threshold, determining that the downlink data needs to be received from the U-Cell .
The UE of claim 51, wherein

The transceiver module is specifically configured to:

Receiving retransmission of the downlink data by the network device through the L-Cell.
The UE according to claim 62, wherein the transceiver module is specifically configured to:

Receiving retransmission of the downlink data by the network device through the HARQ process X of the L-Cell.
The UE of claim 63, wherein

The transceiver module is further configured to: before receiving the retransmission of the downlink data by the network device by using the HARQ process X of the L-Cell, receiving a cross-HARQ entity/cross-cell retransmission sent by the network device Configuration information;

The processing module is further configured to: when determining, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, The HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.
The UE of claim 63, wherein

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink data. The transmission method of retransmission is preset.
The UE of claim 63, wherein

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink data. The transmission mode of the retransmission is preset; the L-Cell is the primary cell PCell that communicates with the current UE.
The UE according to any one of claims 64 to 66, wherein the transceiver module is further configured to: after receiving the downlink data transmission by the network device through the HARQ process Y of the U-Cell,

Receiving, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, where the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process X;

The transceiver module is specifically configured to: perform scheduling signaling scheduling on the cross-HARQ entity/cross-cell retransmission Retrieving the downlink data on the downlink resource on the L-Cell.
The UE of claim 62, wherein

The transceiver module is further configured to: receive configuration information that is sent by the network device and is sent across a HARQ entity/cross-cell retransmission;

The processing module is further configured to: determine, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, when there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell And the L-Cell replaces the U-Cell to perform retransmission of the downlink data.
The UE of claim 62, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. default.
The UE of claim 62, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. Preset; the L-Cell is a primary cell PCell that communicates with the UE.
The UE according to any one of claims 68 to 70, characterized in that

The transceiver module is further configured to: after the receiving network device transmits the downlink data by using the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell weight sent by the network device by using the L-Cell Transmission scheduling signaling;

The transceiver module is specifically configured to: receive retransmission of the downlink data on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.
The UE according to claim 71, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the current UE from the current and the current information. The cell that uses the licensed spectrum for UE communication receives the use of the communication with the current UE. Retransmission of downlink data on a cell of the weight spectrum;

The identifier of the U-Cell;

The identifier of the HARQ process Y.
The UE according to any one of claims 68 to 72, wherein the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are independently allocated.
The UE of claim 62, wherein

The transceiver module is further configured to: before receiving the retransmission of the downlink data by the network device by using the L-Cell,

Receiving the U-Cell configuration information sent by the network device, where the U-Cell configuration information includes:

The HARQ process identifier that the UE can use on the U-Cell; or

a range of HARQ process identifiers that the UE can use on the U-Cell; or

The initial HARQ process identifier in the HARQ process identifier that the UE can use on the U-Cell.
The UE of claim 74, wherein

The transceiver module is further configured to: after receiving the downlink data transmission by the network device through the HARQ process Y of the U-Cell, receive the cross-HARQ entity/cross-cell retransmission scheduling sent by the network device by using the L-Cell Signaling, the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process Y;

The processing module is further configured to: determine, according to the received U-Cell configuration information, that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE to receive the downlink from the L-Cell Retransmission of data;

The transceiver module is specifically configured to: receive retransmission of the downlink data on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.
The UE according to claim 74 or 75, wherein the identifier of the HARQ process of the L-Cell is different from the identifier of the HARQ process of the U-Cell.
The UE according to any one of claims 62 to 76, characterized in that

The transceiver module is further configured to: receive, by the network device, first indication information that is sent when the U-Cell has no or lack of available downlink resources for scheduling the UE to transmit the downlink data, where the first The indication information is used to indicate that the UE has no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell;

The processing module is further configured to: after the transceiver module receives the first indication information, determine:

Retrieving the downlink data of the HARQ process Y of the U-Cell from a cell using the licensed spectrum in communication with the current UE; or receiving the U from a cell using the licensed spectrum in communication with the current UE Retransmission of all HARQ processes on the Cell; or retransmission of the designated HARQ process on the U-Cell from the cell using the licensed spectrum in communication with the current UE.
The UE according to any one of claims 62 to 76, characterized in that

The transceiver module is further configured to: receive, by the network device, first indication information;

The processing module is further configured to: determine, according to the first indication information:

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive the HARQ process Y of the U-Cell from the cell that uses the licensed spectrum that communicates with the current UE. Retransmission of the downlink data; or

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive all HARQ processes on the U-Cell from the cell using the licensed spectrum that communicates with the current UE. Retransmission of the downlink data; or

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive the specified HARQ process on the U-Cell from the cell using the licensed spectrum that communicates with the current UE. The downlink data is retransmitted.
The UE according to claim 77 or 78, wherein the processing module determines that the downlink data of the designated HARQ process on the U-Cell needs to be received from a cell that uses the licensed spectrum in communication with the current UE. Retransmission

The first indication information includes: identifier information of the specified HARQ process.
The UE according to any one of claims 77 to 79, characterized in that

The transceiver module is further configured to receive the second indication information that is sent by the network device, where the second indication information is used to indicate that there is an available downlink on the U-Cell for scheduling the current UE to transmit the downlink data. Receiving, after receiving the second indication information, the downlink data of the HARQ process Y from the U-Cell; or

The transceiver module is further configured to receive the second indication information that is sent by the network device, and determine, by the processing module, that the current UE is configured to transmit the downlink on the U-Cell according to the second indication information. The downlink data of the HARQ process Y is received from the U-Cell when the downlink resource of the data is available.
The UE according to any one of claims 62 to 80, wherein the transceiver module is further configured to: after receiving the downlink data transmission that is re-executed by the network device by using the L-Cell, After the timing synchronization timer TAT of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, the downlink for the HARQ process Y is sent to the network device. Feedback information for retransmission of data.
The UE according to claim 67, 71, 72 or 75, wherein the processing module is further configured to:

Transmitting, by the transceiver module, the retransmitted data of the downlink data to the HARQ entity corresponding to the U-Cell of the UE, and the data in the cache of the HARQ process Y of the U-Cell Merger; or

And synthesizing data in the cache of the HARQ process Y of the U-Cell of the UE with data of retransmission of the downlink data received by the transceiver module.
The UE of claim 82, wherein

The processing module is further configured to: send data in a cache of the HARQ process Y of the U-Cell of the UE to a HARQ entity corresponding to the L-Cell of the UE, and receive Before the data of the retransmission of the downlink data is merged,

Establishing the HARQ of the L-Cell for the U-Cell when the transceiver module receives the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device by using the L-Cell a first buffer of the process Y, or a first cache for the HARQ process for transmitting the retransmission of the downlink data corresponding to the L-Cell;

After receiving, by the transceiver module, the retransmitted data of the downlink data, buffering the received retransmitted data into the established first cache;

The processing module is specifically configured to: merge data in a cache of the HARQ process Y of the U-Cell of the UE with retransmitted data buffered in the first cache.
The UE of claim 82, wherein

The processing module is further configured to: before the re-transmitted data of the downlink data received by the transceiver module, the HARQ entity corresponding to the L-Cell receives the U-Cell Establishing the first buffer of the L-Cell for the HARQ process Y or the HARQ process for transmitting the retransmission of the downlink data corresponding to the L-Cell when the downlink data of the HARQ process Y is a first cache, and buffering the received data of the HARQ process Y of the U-Cell into the first cache;

The processing module is specifically configured to: when the transceiver module receives the retransmitted retransmission data of the HARQ process Y sent by the network device by using the L-Cell, the processing module receives and caches the retransmitted data. The data of the HARQ process Y of the U-Cell in the first cache is merged with the received retransmitted retransmission data.
The UE according to any one of claims 82 to 84, wherein the processing module is further configured to:

After combining the data in the cache of the HARQ process Y of the U-Cell of the UE with the retransmitted data of the downlink data received by the transceiver module, clearing the U- of the current UE The data in the cache of the HARQ process Y corresponding to the Cell.
A method for transmitting downlink data, comprising:

Performing initial transmission of downlink data to the user equipment UE by the hybrid automatic repeat request HARQ process Y of the unlicensed cell U-Cell;

Determining that the retransmission mode of the downlink data is retransmission by using an authorized cell L-Cell;

Retransmitting the downlink data to the UE by using the L-Cell.
The method according to claim 86, further comprising: before the retransmission of the downlink data to the UE by using the L-Cell, further comprising:

Transmitting the cross-HARQ entity/cross-cell transmission configuration information to the UE, the cross-HARQ entity/cross-cell transmission configuration information is used to indicate that the retransmission mode of the downlink data of the UE is retransmitted by the L-Cell.
The method of claim 86, wherein

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset.
The method of claim 86, wherein

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, and the L-Cell is a primary cell PCell that communicates with the UE.
The method according to any one of claims 87 to 89, further comprising: after the initial transmission of the downlink data to the UE by the HARQ process Y of the U-Cell, the method further comprising:

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE, where the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to indicate that the UE is from the L-Cell Receiving retransmission of the downlink data;

Retransmitting the downlink data to the UE by using the L-Cell, including:

Retransmitting the downlink data to the UE on the downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling.
The method according to claim 90, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

Retransmitted indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.
The method according to claim 90 or 91, further comprising: before the initial transmission of the downlink data to the UE by the HARQ process Y of the U-Cell, the method further comprising:

Transmitting the cross-carrier scheduling signaling to the UE by using the U-Cell, where the cross-carrier scheduling signaling is used to instruct the UE to receive the initial transmission of the downlink data from the HARQ process Y on the U-Cell ;

Performing the initial transmission of the downlink data to the UE by using the HARQ process Y of the U-Cell, including: performing, on the downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling, to the UE The initial transmission of downlink data.
The method according to claim 92, wherein the cross-carrier scheduling signaling comprises:

Initial transmission indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.
The method according to any one of claims 86 to 93, after the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

Before determining that the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, the feedback information for the retransmission of the downlink data sent by the UE is not received;

After determining that the timing synchronization timer TAT of the time advance group TAG of the U-Cell is timed out, if the TAT of the TAG where the L-Cell is located does not time out, waiting for the retransmission of the downlink data sent by the UE Feedback information.
A method for transmitting downlink data, comprising:

Transmitting the HARQ process Y by the hybrid automatic repeat request of the unlicensed cell U-Cell, and transmitting the downlink data to the user equipment UE;

Determining, on the U-Cell, that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data, and determining to retransmit the downlink data to the UE by using the authorized cell L-Cell;

And transmitting, by the L-Cell, the downlink data to the UE.
The method of claim 95, wherein

Determining, by the L-Cell, re-transmitting the downlink data to the UE, including: determining, by using the L-Cell, performing initial transmission and retransmission of the downlink data to the UE;

Retransmitting the downlink data to the UE by using the L-Cell, including:

Performing initial transmission and retransmission of the downlink data to the UE by using the L-Cell.
The method of claim 96, wherein the transmitting the downlink data to the UE by using the HARQ process Y of the U-Cell comprises:

Performing initial transmission and retransmission of the downlink data to the UE through the HARQ process Y of the U-Cell.
The method according to claim 96 or 97, further comprising: before the initial transmission and retransmission of the downlink data to the UE by using the L-Cell, the method further comprising:

Transmitting, by the UE, cross-HARQ entity/cross-cell transmission configuration information, where the cross-HARQ entity/cross-cell transmission configuration information is used to indicate that the UE has no or lack of scheduling for the UE transmission on the U-Cell When the downlink resource of the downlink data is available, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data.
A method according to claim 96 or 97, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission method is preset.
A method according to claim 96 or 97, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data. The transmission mode is preset, and the L-Cell is a primary cell PCell that communicates with the UE.
The method according to any one of claims 98 to 100, wherein after the determining, by the authorized cell L-Cell, the initial transmission and retransmission of the downlink data to the UE, the Before performing the initial transmission and retransmission of the downlink data to the UE, the L-Cell further includes:

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, sending a first resource status indication message to the UE, where the first resource status indication message is used to indicate The UE:

There is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell; or

After the first effective time length, there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.
The method of claim 101, further comprising:

And when the U-Cell is configured to send the second downlink resource status indication message to the UE, where the second resource status indication message is used to indicate that the UE is configured to transmit the downlink data. UE:

An available downlink resource for scheduling the UE to transmit the downlink data exists on the U-Cell; or

Within the second effective time length, there are available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.
The method of claim 95, wherein

Retransmitting the downlink data to the UE by using the L-Cell, including:

Retransmitting the downlink data to the UE by using the L-Cell.
The method of claim 103, wherein the performing the retransmission of the downlink data to the UE by using the L-Cell comprises:

Retransmitting the downlink data to the UE by using the HARQ process X of the L-Cell.
The method of claim 104, before the retransmission of the downlink data to the UE by the HARQ process X of the L-Cell, the method further includes:

And transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, where the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE has no or lack of scheduling on the U-Cell. The HARQ process of the L-Cell when the UE transmits the available downlink resources of the downlink data X replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.
The method of claim 104, wherein

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink The transmission method of data retransmission is preset.
The method of claim 104, wherein

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink The transmission mode of retransmission of data is preset; the L-Cell is a primary cell PCell that communicates with the UE.
The method according to any one of claims 105 to 107, further comprising: after the transmitting the downlink data to the UE by the HARQ process Y of the U-Cell, the method further comprising:

Transmitting the HARQ entity/cross-cell retransmission scheduling signaling to the UE by using the L-Cell, where the cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the HARQ process X is used to indicate that the UE performs the retransmission transmission mode of the downlink data according to the HARQ process X of the L-Cell instead of the HARQ process Y of the U-Cell, and the cross The retransmission data of the downlink data scheduled by the HARQ entity/cross-cell retransmission scheduling signaling is merged with the downlink data on the HARQ process Y on the U-Cell;

Retransmitting the downlink data to the UE by using the HARQ process X of the L-Cell, including: on the L-Cell of the cross-HARQ entity/cross-cell retransmission scheduling signaling scheduling Retransmitting the downlink data to the UE on the downlink resource.
The method of claim 103, before the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

And transmitting configuration information of the cross-HARQ entity/cross-cell retransmission to the UE, where the configuration information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the UE has no or lack of scheduling on the U-Cell. When the UE transmits the available downlink resources of the downlink data, the L-Cell replaces the U-Cell Performing retransmission of the downlink data.
The method of claim 103, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. default.
The method of claim 103, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. Preset; the L-Cell is a primary cell PCell that communicates with the UE.
A method according to any one of claims 109 to 111, characterized in that

After the downlink data transmission to the UE by the HARQ process Y of the U-Cell, the method further includes:

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE, where the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to indicate that the UE is from the L-Cell Receiving retransmission of the downlink data;

Performing, by the L-Cell, the retransmission of the downlink data to the UE, including: on a downlink resource on the L-Cell that is scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling Retransmitting the downlink data to the UE.
The method according to claim 112, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE from Retransmitting the downlink data on a cell using an unlicensed spectrum that communicates with the UE on a cell that uses the licensed spectrum that is communicated by the UE;

The identifier of the U-Cell;

The identifier of the HARQ process Y.
The method according to any one of claims 109 to 113, wherein the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are independently allocated.
The method of claim 103, wherein

Before performing the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

Sending U-Cell configuration information to the UE, where the U-Cell configuration information includes:

The HARQ process identifier that the UE can use on the U-Cell; or

a range of HARQ process identifiers that the UE can use on the U-Cell; or

The initial HARQ process identifier in the HARQ process identifier that the UE can use on the U-Cell.
The method of claim 115, further comprising: after the transmitting the downlink data to the UE by the HARQ process Y of the U-Cell:

Transmitting, by the L-Cell, cross-HARQ entity/cross-cell retransmission scheduling signaling to the UE,

The cross-HARQ entity/cross-cell retransmission scheduling signaling includes:

The identifier of the HARQ process Y, indicating that the UE determines, according to the received U-Cell configuration information, that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the UE from the L-Cell. Receiving retransmission of the downlink data;

Performing, by the L-Cell, the retransmission of the downlink data to the UE, where the downlink resource on the L-Cell of the cross-HARQ entity/cross-cell retransmission scheduling signaling scheduling is performed, Performing retransmission of the downlink data to the UE.
The method according to claim 115 or 116, wherein the identifier of the HARQ process of the L-Cell is different from the identifier of the HARQ process of the U-Cell.
The method of any one of claims 103 to 117, further comprising:

When the U-Cell has no or no available downlink resources for scheduling the UE to transmit the downlink data, the first indication information is sent to the UE, where the first indication information is used to indicate the UE:

The UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE Retransmission of the downlink data of the HARQ process Y; or

The UE needs to receive retransmission of the downlink data of all HARQ processes on the U-Cell from a cell using the licensed spectrum that communicates with the UE; or

The UE needs to receive retransmission of the downlink data of the designated HARQ process on the U-Cell from a cell using the licensed spectrum that communicates with the UE.
The method according to any one of claims 103 to 117, further comprising: transmitting, to the UE, first indication information, where the first indication information is used to indicate the UE:

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of the HARQ process Y; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of all HARQ processes on; or

When there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell, the UE needs to receive the U-Cell from a cell using a licensed spectrum that communicates with the UE. Retransmission of the downlink data of the specified HARQ process.
The method according to claim 118 or 119, wherein if the first indication information is used to indicate the UE: the UE needs to receive the U from a cell that uses a licensed spectrum that communicates with the UE. - retransmission of the downlink data of the specified HARQ process on the Cell, then

The first indication information includes: identifier information of the specified HARQ process.
The method of any one of claims 118 to 120, further comprising:

When the U-Cell has an available downlink resource for scheduling the UE to transmit the downlink data, the second indication information is sent to the UE, where the second indication information is used to indicate the UE: The U-Cell receives the downlink data of the HARQ process Y; or

Transmitting, to the UE, second indication information, where the second indication information is used to indicate that the UE: when there is an available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, The U-Cell receives the downlink data of the HARQ process Y.
The method according to any one of claims 103 to 121, after the retransmission of the downlink data to the UE by using the L-Cell, the method further includes:

Before determining that the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located, the feedback information for the retransmission of the downlink data sent by the UE is not received;

After determining that the timing synchronization timer TAT of the time advance group TAG of the U-Cell is timed out, if the TAT of the TAG where the L-Cell is located does not time out, waiting for the retransmission of the downlink data sent by the UE Feedback information.
A downlink data transmission method, comprising:

Receiving an initial transmission of downlink data sent by the network device through the hybrid automatic repeat request of the unlicensed cell U-Cell to the HARQ process Y;

Determining that the retransmission mode of the downlink data is retransmission by using an authorized cell L-Cell;

Receiving retransmission of the downlink data by the network device through the L-Cell.
The method of claim 123, further comprising: before receiving the retransmission of the downlink data by the network device by using the L-Cell,

Receiving the cross-HARQ entity/cross-cell transmission configuration information sent by the network device, and determining, according to the received cross-HARQ entity/cross-cell transmission configuration information, that the retransmission mode of the downlink data is retransmitted by the L-Cell.
The method of claim 123, wherein

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset.
The method of claim 123, wherein

The retransmission mode of the downlink data that is retransmitted by the L-Cell is preset, and the L-Cell is a primary cell PCell that communicates with the current UE.
The method according to any one of claims 124 to 126, further comprising: after the initial transmission of the downlink data sent by the receiving network device by the HARQ process Y of the U-Cell, the method further comprising:

Receiving, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, determining, according to the received cross-HARQ entity/cross-cell retransmission scheduling signaling, from the L-Cell Receiving retransmission of the downlink data;

Receiving, by the network device, retransmission of the downlink data by using the L-Cell, including: downlink resources on the L-Cell scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling Receiving a retransmission of the downlink data.
The method according to claim 127, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

Retransmitted indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.
The method according to claim 127 or 128, further comprising: before the initial transmission of the downlink data sent by the receiving network device by the HARQ process Y of the U-Cell, the method further comprising:

Receiving, by the network device, the cross-carrier scheduling signaling sent by the U-Cell, and determining, according to the received cross-carrier scheduling signaling, the initial transmission of the downlink data from the HARQ process Y on the U-Cell ;

The initial transmission of the downlink data sent by the receiving network device by the HARQ process Y of the U-Cell includes: receiving the downlink data on the downlink resource on the U-Cell scheduled by the cross-carrier scheduling signaling Initial transmission.
The method according to claim 129, wherein the cross-carrier scheduling signaling includes:

Initial transmission indication information;

The identification of the U-Cell;

The identifier of the HARQ process Y.
The method according to any one of claims 123 to 130, further comprising: after receiving the retransmission of the downlink data by the network device by using the L-Cell,

After the timing synchronization timer TAT of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, the retransmission of the downlink data is sent to the network device. Feedback information.
The method of any one of claims 127 to 130, further comprising:

And transmitting the retransmitted data of the downlink data to the HARQ entity corresponding to the U-Cell of the current UE, and merging with the data in the cache of the HARQ process Y of the U-Cell; or

And transmitting the data in the cache of the HARQ process Y of the U-Cell of the current UE to the HARQ entity corresponding to the L-Cell of the current UE, and combining the data of the retransmission of the received downlink data.
The method of claim 132, wherein

Before the data of the retransmitted data of the received downlink data is combined, the method further includes:

Establishing, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, the first of the L-Cell's HARQ process Y for the U-Cell Caching, or a first buffer for the HARQ process for transmitting the retransmission of the downlink data corresponding to the L-Cell;

After receiving the retransmitted data of the downlink data, buffering the received retransmitted data into the established first cache;

The merging with the retransmitted data of the received downlink data includes: merging with the retransmitted data received and buffered into the first cache.
The method of claim 132, wherein

Before the data of the retransmitted data of the received downlink data is combined, the method further includes:

When the downlink data corresponding to the HARQ process Y of the U-Cell is received by the HARQ entity corresponding to the L-Cell, establishing a first cache of the L-Cell for the HARQ process Y, or for a first buffer of the HARQ process for transmitting the retransmitted downlink data corresponding to the L-Cell, and buffering the received data of the HARQ process Y of the U-Cell to the first cache Medium

The combining with the received retransmitted retransmission data includes: receiving, when receiving the retransmitted retransmission data of the HARQ process Y sent by the network device by using the L-Cell, receiving And the data of the HARQ process Y of the U-Cell buffered in the first cache is merged with the received retransmitted retransmission data.
The method according to any one of claims 132 to 134, wherein the data in the cache of the HARQ process Y of the U-Cell of the current UE is sent to the L of the current UE. After the HARQ entity corresponding to the Cell, the method further includes:

Clearing data in the cache of the HARQ process Y corresponding to the U-Cell of the current UE.
A method for transmitting downlink data, comprising:

Receiving, by the network device, the downlink data transmission by the hybrid automatic retransmission requesting HARQ process Y by the unlicensed cell U-Cell;

Determining, on the U-Cell, that there is no or lack of available downlink resources for scheduling the current user equipment UE to transmit the downlink data, and determining, by using the authorized cell L-Cell, receiving the downlink data transmission that is re-executed by the network device. ;

Receiving, by the network device, the downlink data transmission by the L-Cell.
The method of claim 136, wherein

Determining, by the L-Cell, receiving the downlink data transmission that is performed by the network device, including: determining, by using the L-Cell, receiving initial transmission and retransmission of the downlink data by the network device ;

Receiving, by the network device, the transmission of the downlink data that is performed by the L-Cell, including:

Receiving initial transmission and retransmission of the downlink data by the network device through the L-Cell.
The method of claim 137, wherein the transmitting, by the receiving network device, the downlink data transmission by the HARQ process Y of the U-Cell comprises:

Receiving the downlink data that is performed by the network device by using the HARQ process Y of the U-Cell Initial transmission and retransmission.
The method according to claim 137 or 138, further comprising: before the initial transmission and retransmission of the downlink data by the network device by the HARQ process Y of the U-Cell;

Receiving cross-HARQ entity/cross-cell transmission configuration information sent by the network device, determining, according to the cross-HARQ entity/cross-cell transmission configuration information, that there is no or lack of scheduling on the U-Cell for scheduling the current UE to transmit the downlink When the downlink resource of the data is available, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data.
A method according to claim 137 or 138, characterized in that

When the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission transmission of the downlink data. The way is preset.
A method according to claim 137 or 138, characterized in that

When the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform initial transmission and retransmission transmission of the downlink data. The mode is preset, and the L-Cell is a primary cell PCell that communicates with the current UE.
The method according to any one of claims 139 to 141, after the determining, by the L-Cell, receiving initial transmission and retransmission of the downlink data by the network device, Before receiving the initial transmission and retransmission of the downlink data by the network device by using the L-Cell, the method further includes:

Receiving, by the network device, a first resource status indication message, where the first resource status indication message is used to indicate that the current UE has no or lack of available on the U-Cell for scheduling the current UE to transmit the downlink data. Downstream resources:

After receiving the first resource status indication message, determining that an initial transmission and retransmission of the downlink data needs to be received from a cell that uses the licensed spectrum that is in communication with the current UE; or

After receiving the first resource status indication message, starting a first timer, at the first timing Before the timer expires, if the U-Cell still does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, it is determined that the downlink needs to be received from the cell using the licensed spectrum that communicates with the current UE. Initial transmission and retransmission of data.
The method according to any one of claims 139 to 141, further comprising: receiving a first resource status indication message sent by the network device, where the first resource status indication message is used to indicate that: After the effective time length, there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell;

Determining, after receiving the first valid time length after receiving the first resource status indication message, requesting initial transmission and retransmission of the downlink data from a cell using the licensed spectrum that communicates with the current UE; or

After the first valid time length after receiving the first resource status indication message, start the first timer, if there is still no or lack of scheduling on the U-Cell before the first timer expires The current UE transmits the available downlink resources of the downlink data, and determines that the initial transmission and the retransmission of the downlink data need to be received from the cell that uses the licensed spectrum that is in communication with the current UE.
The method of claim 142 or 143, further comprising: after receiving the initial transmission and retransmission of the downlink data on the cell that needs to use the licensed spectrum from the current UE, the method further includes:

Clearing the cache of the HARQ process Y on the U-Cell.
The method of any one of claims 142 to 144, further comprising:

Receiving, by the network device, a second resource status indication message, where the second resource status indication message is used to indicate that the current UE: the U-Cell has an available downlink resource for scheduling the current UE to transmit the downlink data;

After receiving the second resource status indication message, determining that the downlink data needs to be received from the U-Cell; or

After the second resource status indication message is received, the second timer is started, and after the second timer expires, if there is still available on the U-Cell for scheduling the current UE to transmit the downlink data, The row resource determines that the downlink data needs to be received from the U-Cell.
The method of any one of claims 142 to 144, further comprising:

Receiving, by the network device, a second resource status indication message, where the second resource status indication message is used to indicate that, within the second valid time length, the U-Cell is configured to schedule the current UE to transmit the Available downlink resources for downlink data;

After the second resource status indication message is received, if it is determined that the second valid time length is greater than a preset resource effective time length threshold, it is determined that the downlink data needs to be received from the U-Cell.
The method of claim 136, wherein

Receiving, by the network device, the downlink data transmission that is performed by the L-Cell, including:

Receiving retransmission of the downlink data by the network device through the L-Cell.
The method of claim 147, wherein the receiving the retransmission of the downlink data by the network device by using the L-Cell comprises:

Receiving retransmission of the downlink data by the network device through the HARQ process X of the L-Cell.
The method according to claim 148, further comprising: before the retransmission of the downlink data by the network device X of the L-Cell by the HARQ process X of the L-Cell, the method further comprising:

Receiving configuration information of the cross-HARQ entity/cross-cell retransmission sent by the network device, determining, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, that there is no or lack of scheduling for the current UE on the U-Cell When the available downlink resources of the downlink data are transmitted, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform retransmission of the downlink data.
The method of claim 148, wherein

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink data. The transmission method of retransmission is preset.
The method of claim 148, wherein

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to perform the downlink data. The transmission mode of the retransmission is preset; the L-Cell is the primary cell PCell that communicates with the current UE.
A method according to any one of claims 149 to 151, characterized in that

After the transmission of the downlink data by the receiving network device through the HARQ process Y of the U-Cell, the method further includes:

Receiving, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, where the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process X;

Retransmitting the downlink data by the network device by using the HARQ process X of the L-Cell, including: the L-Cell scheduled in the cross-HARQ entity/cross-cell retransmission scheduling signaling On the downlink resource, the retransmission of the downlink data is received.
The method of claim 147, further comprising: before receiving the retransmission of the downlink data by the network device by using the L-Cell,

Receiving, by the network device, configuration information for transmitting a cross-HARQ entity/cross-cell retransmission, determining, according to the configuration information of the cross-HARQ entity/cross-cell retransmission, that there is no or lack of scheduling on the U-Cell for scheduling current When the UE transmits the available downlink resources of the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data.
The method of claim 147, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform retransmission of the downlink data. Set.
The method of claim 147, wherein

When the U-Cell does not have or lacks available downlink resources for scheduling the current UE to transmit the downlink data, the L-Cell replaces the U-Cell to perform the retransmission of the downlink data. It is preset; the L-Cell is a primary cell PCell that communicates with the current UE.
A method according to any one of claims 153 to 155, characterized in that

After the transmission of the downlink data by the receiving network device through the HARQ process Y of the U-Cell, the method further includes:

Receiving cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the network device by using the L-Cell;

Receiving, by the network device, retransmission of the downlink data by using the L-Cell, including: downlink resources on the L-Cell scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling Receiving a retransmission of the downlink data.
The method according to claim 156, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

The indication information of the cross-HARQ entity/cross-cell retransmission is used to indicate that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule the current UE from the current and the current information. Retransmitting downlink data on a cell using an unlicensed spectrum that communicates with the current UE on a cell that uses the licensed spectrum for UE communication;

The identifier of the U-Cell;

The identifier of the HARQ process Y.
The method according to any one of claims 153 to 157, wherein the identifier of the HARQ process of the L-Cell and the identifier of the HARQ process of the U-Cell are independently allocated.
The method of claim 147, wherein

Before the receiving, by the network device, the retransmission of the downlink data by using the L-Cell, the method further includes:

Receiving the U-Cell configuration information sent by the network device, where the U-Cell configuration information includes:

The HARQ process identifier that the current UE can use on the U-Cell; or

The range of HARQ process identifiers that the current UE can use on the U-Cell; or

The starting HARQ of the HARQ process identifier that the current UE can use on the U-Cell Process identification.
The method of claim 159, further comprising: after the transmitting, by the receiving network device, the downlink data transmission by the HARQ process Y of the U-Cell:

Receiving, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, where the cross-HARQ entity/cross-cell retransmission scheduling signaling includes: an identifier of the HARQ process Y;

Determining, according to the received U-Cell configuration information, that the cross-HARQ entity/cross-cell retransmission scheduling signaling is used to schedule retransmission of the downlink data by the current UE from the L-Cell;

Receiving, by the network device, retransmission of the downlink data by using the L-Cell, including: downlink resources on the L-Cell scheduled by the cross-HARQ entity/cross-cell retransmission scheduling signaling Receiving a retransmission of the downlink data.
The method according to claim 159 or 160, wherein the identifier of the HARQ process of the L-Cell is different from the identifier of the HARQ process of the U-Cell.
The method of any one of claims 147 to 161, further comprising:

Receiving, by the network device, the first indication information that is sent when the U-Cell does not have any available downlink resources for scheduling the current UE to transmit the downlink data, where the first indication information is used to indicate that the current UE: There is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell;

After receiving the first indication information, determining that retransmission of the downlink data of the HARQ process Y of the U-Cell needs to be received from a cell that uses the licensed spectrum that is in communication with the current UE; or needs to be from the current UE Receiving retransmission of all HARQ processes on the U-Cell on a cell using the licensed spectrum; or receiving a weight of a specified HARQ process on the U-Cell from a cell using the licensed spectrum in communication with the current UE pass.
The method of any one of claims 147 to 161, further comprising:

Receiving, by the network device, sending the first indication information;

Determining according to the first indication information:

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive the HARQ process Y of the U-Cell from the cell that uses the licensed spectrum that communicates with the current UE. Retransmission of the downlink data; or

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive all HARQ processes on the U-Cell from the cell using the licensed spectrum that communicates with the current UE. Retransmission of the downlink data; or

When there is no or lack of available downlink resources for scheduling the current UE to transmit the downlink data, the U-Cell needs to receive the specified HARQ process on the U-Cell from the cell using the licensed spectrum that communicates with the current UE. The downlink data is retransmitted.
The method according to claim 162 or 163, wherein if it is determined that retransmission of the downlink data of the designated HARQ process on the U-Cell is required to be received from a cell using the licensed spectrum in communication with the current UE, then

The first indication information includes: identifier information of the specified HARQ process.
The method of any one of claims 162 to 164, further comprising:

Receiving the second indication information that is sent by the network device, where the second indication information is used to indicate that there are available downlink resources on the U-Cell for scheduling the current UE to transmit the downlink data; After the second indication information, receiving the downlink data of the HARQ process Y from the U-Cell; or

Receiving the second indication information that is sent by the network device, and determining, according to the second indication information, that when the U-Cell has available downlink resources for scheduling the current UE to transmit the downlink data, the U- The downlink data of the HARQ process Y is received on the Cell.
The method according to any one of claims 147 to 165, further comprising: after receiving the transmission of the downlink data that is re-executed by the network device by using the L-Cell,

After the timing synchronization timer TAT of the time advance group TAG of the U-Cell expires, if the TAT of the TAG where the L-Cell is located does not time out, the downlink for the HARQ process Y is sent to the network device. Feedback information for retransmission of data.
The method of claim 152, 156, 157 or 160, further comprising:

And transmitting the retransmitted data of the downlink data to the HARQ entity corresponding to the U-Cell of the current UE, and merging with the data in the cache of the HARQ process Y of the U-Cell; or

And transmitting the data in the cache of the HARQ process Y of the U-Cell of the current UE to the HARQ entity corresponding to the L-Cell of the current UE, and combining the data of the retransmission of the received downlink data.
The method of claim 167, wherein

Before the data of the retransmitted data of the received downlink data is combined, the method further includes:

Establishing, by the network device, the cross-HARQ entity/cross-cell retransmission scheduling signaling sent by the L-Cell, the first of the L-Cell's HARQ process Y for the U-Cell Caching, or a first buffer for the HARQ process for transmitting the retransmission of the downlink data corresponding to the L-Cell;

After receiving the retransmitted data of the downlink data, buffering the received retransmitted data into the established first cache;

The merging with the retransmitted data of the received downlink data includes: merging with the retransmitted data received and buffered into the first cache.
The method of claim 167, wherein

Before the data of the retransmitted data of the received downlink data is combined, the method further includes:

When the downlink data corresponding to the HARQ process Y of the U-Cell is received by the HARQ entity corresponding to the L-Cell, establishing a first cache of the L-Cell for the HARQ process Y, or for a first buffer of the HARQ process for transmitting the retransmitted downlink data corresponding to the L-Cell, and buffering the received data of the HARQ process Y of the U-Cell to the first cache in;

The combining with the received retransmitted retransmission data includes: receiving, when receiving the retransmitted retransmission data of the HARQ process Y sent by the network device by using the L-Cell, receiving Slow down The data of the HARQ process Y of the U-Cell stored in the first cache is merged with the received retransmitted retransmission data.
The method according to any one of claims 167 to 169, wherein the data in the cache of the HARQ process Y of the U-Cell of the current UE is sent to the L of the current UE. After the HARQ entity corresponding to the Cell, the method further includes:

Clearing data in the cache of the HARQ process Y corresponding to the U-Cell of the current UE.