CN107211394B

CN107211394B - Network equipment, user equipment and downlink data transmission method

Info

Publication number: CN107211394B
Application number: CN201580071562.8A
Authority: CN
Inventors: 常俊仁; 冯淑兰; 张兴炜
Original assignee: Huawei Technologies Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2015-04-07
Filing date: 2015-04-07
Publication date: 2020-01-31
Anticipated expiration: 2035-04-07
Also published as: CN107211394A; WO2016161558A1

Abstract

The invention relates to a wireless communication technology, in particular to network equipment, user equipment and a downlink data transmission method, which are used for solving the problem of overlarge delay of a part of data packets transmitted on an unlicensed spectrum in an access LAA system assisted by an unlicensed carrier.

Description

Network equipment, user equipment and downlink data transmission method

Technical Field

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

Background

Currently, in spectrum management, parts of spectrum are licensed to some mobile communication system, such as Universal Mobile Telecommunications Service (UMTS) or Long Term Evolution (LTE) system, and this part of spectrum is called "licensed spectrum", and the corresponding carriers on the licensed spectrum are also commonly called "licensed carriers".

In addition, some spectrum is partitioned for use by unauthorized wireless communication devices, such as: wireless Fidelity (WiFi) devices. Different wireless communication devices may share the frequency resource, such spectrum is called "unlicensed spectrum", and correspondingly, carriers on the unlicensed spectrum are commonly called "unlicensed carriers". Currently, the unlicensed spectrum mainly includes: 2.4 GHz-2.4835 GHz, and 5.725 GHz-5.850 GHz.

Currently, the frequency band utilization rate of the unlicensed spectrum is relatively low, and the service demand of the user on the mobile communication system is increasing, so that more spectrum resources are required in the mobile communication system to meet the service demand of the user. Such as: operators of mobile communication systems wish to be able to deploy third generation partnership project (3) compliance over unlicensed spectrum^rdGenerationPartner Project, 3GPP) to provide services to users in combination with licensed spectrum.

Generally, an LTE system using Unlicensed spectrum is referred to as an Unlicensed LTE (LTE-Unlicensed, LTE-U) or (Unlicensed LTE, U-LTE) system; or a Licensed Assisted Access (LAA) system.

At present, a flow chart of a Downlink HARQ process in an LTE system is shown in fig. 1, first, a base station evolved node B (eNB) in the LTE system transmits Downlink data on a Physical Downlink Shared Channel (PDSCH) at a subframe 3, a User Equipment (UE) monitors the Downlink data and decodes the Downlink data, if the decoding fails, the UE feeds back NACK information to the eNB on a PUCCH, the eNB demodulates and processes the NACK information in the PUCCH, and then schedules retransmission data according to a Downlink resource allocation condition, where a scheduling time is not specified, the eNB may schedule according to a condition, where it is assumed that the eNB retransmits on the PDSCH at a subframe 9, and if the UE decodes successfully, the eNB transmits ACKs at a subframe 2 of the next radio frames, so that Downlink data transmission ends times.

If the method is also adopted in the LAA system, the delay of partial data packets transmitted on the unlicensed spectrum is too large due to the existence of resources on the unlicensed spectrum.

Disclosure of Invention

The embodiment of the invention provides network equipment, user equipment and a downlink data transmission method, which are used for solving the problem that the delay of part of data packets transmitted on an unauthorized frequency spectrum is overlarge in an LAA system.

, an embodiment of the present invention provides kinds of network devices, including:

the receiving and sending module is used for carrying out initial transmission of downlink data to User Equipment (UE) through a hybrid automatic repeat request (HARQ) process Y of an unlicensed Cell U-Cell;

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

the transceiver module is further configured to: and retransmitting the downlink data to the UE through the L-Cell.

With reference to the , in a possible implementation manner, the transceiver module is further configured to:

sending cross-HARQ entity/cross-Cell transmission configuration information to the UE before retransmitting the downlink data to the UE through the L-Cell, wherein the cross-HARQ entity/cross-Cell transmission configuration information is used for indicating that the retransmission mode of the downlink data of the UE is retransmission through the L-Cell.

With reference to aspect , in a second possible implementation,

the retransmission mode of the downlink data retransmitted through the L-Cell is preset.

With reference to aspect , in a third possible implementation,

the retransmission mode of the downlink data retransmitted through the L-Cell is preset, and the L-Cell is a primary Cell PCell communicated with the UE.

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

after the initial transmission of downlink data is carried out on UE through an HARQ process Y of a U-Cell, sending a cross-HARQ entity/cross-Cell retransmission scheduling signaling to the UE through the L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling is used for indicating the UE to receive the retransmission of the downlink data from the L-Cell;

the transceiver module is specifically configured to:

and retransmitting the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

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

the cross HARQ entity/cross cell retransmission scheduling signaling comprises:

indication information of retransmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

With reference to the fourth or fifth possible implementation manner of the aspect , in a sixth possible implementation manner, the transceiver module is further configured to:

before the initial transmission of downlink data is carried out on UE through an HARQ process Y of a U-Cell, cross-carrier scheduling signaling is sent to the UE through the U-Cell, and the cross-carrier scheduling signaling is used for indicating the UE to receive the initial transmission of the downlink data from the HARQ process Y on the U-Cell;

the transceiver module is specifically configured to: and 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.

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

indication information of initial transmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

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

the transceiver module is further configured to: after the transceiver module retransmits the downlink data to the UE through the L-Cell,

determining that feedback information aiming at retransmission of the downlink data sent by the UE is not received before a timing synchronization timer (TAT) of a time advance group TAG where the U-Cell is located is overtime; and

and after determining that the TAT of the timing synchronization timer of the time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, waiting to receive feedback information which is sent by the UE and aims at retransmission of the downlink data.

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

the receiving and sending module is used for transmitting downlink data to the user equipment UE through a hybrid automatic repeat request HARQ process Y of the non-authorized Cell U-Cell;

a processing module, configured to determine that there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, and determine to retransmit the transmission of the downlink data to the UE through an authorized Cell L-Cell;

the transceiver module is further configured to: and transmitting the downlink data to the UE again through the L-Cell.

In combination with the second aspect, in a th possible implementation,

the processing module is specifically configured to: determining to perform initial transmission and retransmission of the downlink data to the UE through the L-Cell

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

With reference to the th possible implementation manner of the second aspect, in a second possible implementation manner, the transceiver module is specifically configured to:

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

With reference to th or the second possible implementation manner of the second aspect, in a third possible implementation manner,

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

transmitting cross-HARQ entity/cross-cell transmission configuration information to the UE, wherein the cross-HARQ entity/cross-cell transmission configuration information is used for indicating the UE to: and when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data.

With reference to th or the second possible implementation manner of the second aspect, in a fourth possible implementation manner,

when there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the transmission mode of the L-Cell for performing initial transmission and retransmission of the downlink data instead of the U-Cell is preset.

With reference to th possible implementation manner or the second possible implementation manner of the second aspect, in a fifth 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, a transmission manner of the L-Cell to perform initial transmission and retransmission of the downlink data instead of the U-Cell is preset, and the L-Cell is a primary Cell PCell in communication with the UE.

With reference to any of the third to fifth possible implementation manners of the second aspect, in a sixth possible implementation manner, the transceiver module is further configured to, after the processing module determines that initial transmission and retransmission of the downlink data are performed to the UE through an authorized Cell L-Cell, before the transceiver module performs initial transmission and retransmission of the downlink data to the UE through the L-Cell,

transmitting th resource status indication message to the UE when there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the th resource status indication message for indicating to the UE:

none or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data; or

After th active time period, there are 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 manner of the second aspect, in a seventh possible implementation manner, the transceiver module is further configured to:

when available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell, sending a second resource state indication message to the UE, wherein the second resource state indication message is used for indicating the UE to:

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

Available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell within a second effective time length.

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

the transceiver module, when retransmitting the downlink data to the UE via the L-Cell, is specifically configured to:

and retransmitting the downlink data to the UE through the L-Cell.

With reference to the eighth possible implementation manner of the second aspect, in a ninth possible implementation manner, the transceiver module is specifically configured to:

and retransmitting the downlink data to the UE through the HARQ process X of the L-Cell.

With reference to the ninth possible implementation manner of the second aspect, in a tenth possible implementation manner, the transceiver module is further configured to: before retransmission of the downlink data to the UE is performed through HARQ process X of L-Cell,

sending cross-HARQ entity/cross-cell retransmission configuration information to the UE, wherein the cross-HARQ entity/cross-cell retransmission configuration information is used for indicating the UE to: and when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

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

when there is no available downlink resource or lack of available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, a transmission mode is preset in which 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 a twelfth possible implementation manner,

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

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

sending, to the UE, a cross-HARQ entity/cross-Cell retransmission scheduling signaling through the L-Cell, where the cross-HARQ entity/cross-Cell retransmission scheduling signaling includes:

the identifier of the HARQ process X is configured to instruct the UE to perform, according to a transmission mode in which the L-Cell HARQ process X replaces the U-Cell HARQ process Y to perform retransmission of the downlink data, merge retransmission data of the downlink data scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling with the downlink data in the U-Cell HARQ process Y;

the transceiver module is specifically configured to: and retransmitting the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

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

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

sending cross-HARQ entity/cross-cell retransmission configuration information to the UE, wherein the cross-HARQ entity/cross-cell retransmission configuration information is used for indicating the UE to: and the L-Cell replaces the U-Cell to retransmit the downlink data.

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

and when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists in the U-Cell, the L-Cell replaces the U-Cell to perform retransmission of the downlink data in a preset transmission mode.

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

when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, the transmission mode of the L-Cell for performing retransmission of the downlink data in place of the U-Cell is preset; the L-Cell is a primary Cell PCell which communicates with the UE.

With reference to any of the fourteenth to sixteenth possible implementations of the second aspect, in a seventeenth possible implementation,

the transceiver module is further configured to: after the HARQ process Y of the U-Cell transmits downlink data to the UE:

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 being used for instructing the UE to receive retransmission of the downlink data from the L-Cell;

With reference to the seventeenth possible implementation manner of the second aspect, in an eighteenth possible implementation manner,

the cross HARQ entity/cross cell retransmission scheduling signaling comprises:

indication information of cross-HARQ entity/cross-cell retransmission, wherein the indication information of cross-HARQ entity/cross-cell retransmission is used for indicating: the cross-HARQ entity/cross-cell retransmission scheduling signaling is used for scheduling the UE to receive retransmission of the downlink data on a cell which uses an unlicensed spectrum and is communicated with the UE from a cell which uses the licensed spectrum and is communicated with the UE;

an identification of the U-Cell;

identification of the HARQ process Y.

With reference to any of the fourteenth to eighteenth possible implementations of the second aspect, in a nineteenth possible implementation,

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

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

sending U-Cell configuration information to the UE, the U-Cell configuration information comprising:

HARQ process identification usable by the UE on the U-Cell; or

A range of HARQ process identities usable by the UE on the U-Cell; or

And the UE identifies the starting HARQ process in the usable HARQ process identifications on the U-Cell.

With reference to the twentieth possible implementation manner of the second aspect, in a twentieth possible implementation manner, the transceiver module is further configured to, after performing transmission of downlink data to the UE through HARQ process Y of the U-Cell,

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

the cross HARQ entity/cross cell retransmission scheduling signaling comprises the following steps:

an identification of the HARQ process Y;

With reference to the twentieth or twenty possible implementations of the second aspect, in a twenty-second possible implementation,

the identification of the HARQ process of the L-Cell is different from that of the HARQ process of the U-Cell.

With reference to any of the eighth to twenty-second possible implementations of the second aspect, in a twenty-third possible implementation,

the transceiver module is further configured to:

transmitting th indication information to the UE when there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the th indication information being used for indicating the UE to:

the UE needs to receive retransmission of the downlink data of the HARQ process Y of the U-Cell from a Cell which uses a licensed spectrum and 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 which uses a licensed spectrum and 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 a licensed spectrum communicating with the UE.

With reference to any of the eighth to twenty-second possible implementations of the second aspect, in a twenty-fourth possible implementation,

the transceiving module is further configured to send th indication information to the UE, the th indication information being used to indicate the UE to:

when there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the UE needs to receive a retransmission of the downlink data of HARQ process Y of the U-Cell from a Cell using a licensed spectrum, which is in communication with the UE; or

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

When there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the UE needs to receive a retransmission of the downlink data of a designated HARQ process on the U-Cell from a Cell using a licensed spectrum in communication with the UE.

With reference to the twenty-third or twenty-fourth possible implementation manners of the second aspect, in a twenty-fifth possible implementation manner,

if the th indication information is used for indicating the UE that the UE needs to receive retransmission of the downlink data of the designated HARQ process on the U-Cell from a Cell which uses a licensed frequency spectrum and is communicated with the UE, the UE transmits the retransmission to the U-Cell

The th indication information includes identification information of the designated HARQ process.

With reference to any of the twenty-third to twenty-fifth possible implementations of the second aspect, in a twenty-sixth possible implementation,

the transceiver module is further configured to:

when available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell, sending second indication information to the UE, wherein the second indication information is used for indicating the UE to: receiving the downlink data of the HARQ process Y from the U-Cell; or

Sending second indication information to the UE, wherein the second indication information is used for indicating the UE to: receiving the downlink data of the HARQ process Y from the U-Cell when available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell.

With reference to any of the eighth to twenty-sixth possible implementations of the second aspect, in a twenty-seventh possible implementation,

the transceiver module is further configured to: after retransmission of the downlink data to the UE through the L-Cell,

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

the system comprises a receiving and sending module, a sending and receiving module and a sending and receiving module, wherein the receiving and sending module is used for receiving initial transmission of downlink data sent by a network device through a hybrid automatic repeat request HARQ process Y of an unauthorized Cell U-Cell;

the transceiver module is further configured to: receiving retransmission of the downlink data by the network device through the L-Cell.

With reference to the third aspect, in a th possible implementation manner,

the transceiver module is further configured to: receiving cross-HARQ entity/cross-Cell transmission configuration information sent by the network equipment before receiving retransmission of the downlink data by the network equipment through the L-Cell;

the processing module is specifically configured to: and determining that the retransmission mode of the downlink data is retransmission through an L-Cell according to the cross-HARQ entity/cross-Cell transmission configuration information received by the transceiver module.

With reference to the third aspect, in a second possible implementation manner,

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

With reference to any of the th through the third possible implementations of the third aspect, in a fourth possible implementation,

the transceiver module is further configured to: after receiving initial transmission of downlink data sent by a network device through an HARQ process Y of a U-Cell, receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through the L-Cell;

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

the transceiver module is specifically configured to: receiving retransmission of the downlink data on downlink resources on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

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

the cross HARQ entity/cross cell retransmission scheduling signaling comprises:

indication information of retransmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

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

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

the processing module is further configured to: determining to receive initial transmission of the downlink data from an HARQ process Y on the U-Cell according to the received cross-carrier scheduling signaling;

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

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

the cross-carrier scheduling signaling comprises the following steps:

indication information of initial transmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

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

the processing module is further configured to: after the receiving and sending module receives the retransmission of the downlink data by the network equipment through the L-Cell, judging whether a timing synchronization timer (TAT) of a Time Advance Group (TAG) where the U-Cell is located is overtime or not and whether the TAT of the TAG where the L-Cell is located is overtime or not;

the transceiver module is further configured to: after the processing module determines that a timing synchronization timer (TAT) of a Time Advance Group (TAG) where the U-Cell is located is overtime, if the processing module determines that the TAT of the TAG where the L-Cell is located is not overtime, feedback information aiming at retransmission of the downlink data is sent to the network equipment.

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

the processing module is further configured to:

combining 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 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.

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 with the retransmitted data of the downlink data received by the transceiving module,

when the transceiver module receives the cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through the L-Cell, establishing th cache of the L-Cell for HARQ process Y of the U-Cell or th cache of HARQ process corresponding to the L-Cell for transmitting retransmission of the downlink data;

after the transceiver module receives the retransmitted data of the downlink data, caching the retransmitted data received by the transceiver module into the established th cache;

the processing module is specifically configured to combine data in the buffer of the HARQ process Y of the U-Cell of the UE with retransmitted data buffered in the th buffer.

when the HARQ entity corresponding to the L-Cell receives the downlink data of the HARQ process Y of the U-Cell, establishing th cache of the L-Cell for the HARQ process Y or th cache of the HARQ process corresponding to the L-Cell and used for transmitting retransmission of the downlink data, and caching the data of the HARQ process Y of the U-Cell received by the transceiver module into the th cache;

the processing module is specifically configured to, when the transceiver module receives retransmission data of the retransmission of the HARQ process Y sent by the network device through the L-Cell, combine the data of the HARQ process Y of the U-Cell received and buffered in the th buffer with the received retransmission data of the retransmission.

With reference to any of the ninth to tenth possible implementations of the third aspect, in a twelfth possible implementation,

the processing module is further configured to:

and 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, emptying the data in the cache of the HARQ process Y corresponding to the U-Cell of the UE.

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

the receiving and sending module is used for receiving the transmission of downlink data by the network equipment through a hybrid automatic repeat request HARQ process Y of an unauthorized Cell U-Cell;

a processing module, configured to determine that there is no or lack of available downlink resources on the U-Cell for scheduling the current user equipment UE to transmit the downlink data, and determine that the network device receives, through an authorized Cell L-Cell, a transmission of the downlink data that is performed anew by the network device;

the transceiver module is further configured to: and receiving the downlink data transmission which is carried out again by the network equipment through the L-Cell.

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

the processing module is specifically configured to: determining to receive initial transmission and retransmission of the downlink data by the network device through the L-Cell;

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

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

the transceiver module is specifically configured to:

and receiving the initial transmission and retransmission of the downlink data performed by the network equipment through the HARQ process Y of the U-Cell.

With reference to th or the second possible implementation manner of the fourth aspect, in a third possible implementation manner,

the transceiver module is further configured to: receiving cross-HARQ entity/cross-Cell transmission configuration information sent by the network equipment before receiving initial transmission and retransmission of the downlink data by the network equipment through an HARQ process Y of the U-Cell;

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

With reference to th or the second possible implementation manner of the fourth aspect, in a fourth possible implementation manner,

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

when there is no available downlink resource or lack of available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, a transmission mode of the L-Cell for performing initial transmission and retransmission of the downlink data instead of the U-Cell is preset, and the L-Cell is a primary Cell PCell in communication with the current UE.

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

the transceiver module is further configured to: after the processing module determines to receive the initial transmission and retransmission of the downlink data by the network device through the L-Cell, before the transceiving module receives the initial transmission and retransmission of the downlink data by the network device through the L-Cell,

receiving th resource status indication message sent by the network equipment, wherein the th resource status indication message is used for indicating that the UE has no or lacks available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data;

the processing module is further configured to:

after the transceiver module receives the th resource status indication message, it is determined that the initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum, or

Starting a timer after the transceiver module receives the resource status indication message, and determining that initial transmission and retransmission of the downlink data need to be received from a Cell using a licensed spectrum in communication with the UE before the timer expires if there is no downlink resource or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.

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

the transceiver module is further configured to receive th resource status indication message sent by the network device, where the th resource status indication message is used to indicate that no or lack of available downlink resources on the U-Cell is available for scheduling the UE to transmit the downlink data after th active time period;

the processing module is further configured to:

determining that initial transmission and retransmission of the downlink data are required to be received from a cell using a licensed spectrum in communication with the UE after determining that a -th valid time period after the transceiver module receives the -th resource status indication message is available, or

After valid time length after the transceiver module receives the resource status indication message, a timer is started, and before the timer expires, if there is no downlink resource available on the U-Cell or there is no downlink resource available on the U-Cell for scheduling the UE to transmit the downlink data, it is determined that initial transmission and retransmission of the downlink data need to be received from a Cell using a licensed spectrum, which is in communication 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 that initial transmission and retransmission of the downlink data need to be received from a cell using a licensed spectrum in communication with the UE,

emptying the buffer of the HARQ process Y on the U-Cell.

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

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 the UE to: available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell;

the processing module is further configured to:

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

And starting a second timer after the transceiver module receives the second resource state indication message, and determining that the downlink data needs to be received from the U-Cell if available downlink resources for scheduling the UE to transmit the downlink data still exist on the U-Cell after the second timer expires.

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

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: available downlink resources for scheduling the current UE to transmit the downlink data exist on the U-Cell within a second effective time length;

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, it is determined that the downlink data needs to be received from the U-Cell.

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

the transceiver module is specifically configured to:

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

In combination with the tenth 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 HARQ process X of the L-Cell.

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

the transceiver module is further configured to: receiving configuration information of cross-HARQ entity/cross-Cell retransmission sent by the network device before receiving retransmission of the downlink data by the network device through HARQ process X of the L-Cell;

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

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

when there is no available downlink resource or lack of available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, a transmission mode is preset in which 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 twelfth possible implementation manner of the fourth aspect, in a fifteenth possible implementation manner,

when there is no available downlink resource or lack of available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, the transmission mode that the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data is preset; the L-Cell is a primary Cell PCell communicated with the current UE.

With reference to any of the thirteenth to fifteenth possible implementations of the fourth aspect, in a sixteenth possible implementation,

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

receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through the L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling comprises: an identification of the HARQ process X;

With reference to the tenth possible implementation manners of the fourth aspect, in a seventeenth possible implementation manner,

the transceiver module is further configured to: receiving configuration information which is sent by the network equipment and used for sending cross HARQ entity/cross cell retransmission;

the processing module is further configured to: and according to the configuration information of the cross-HARQ entity/cross-Cell retransmission, when determining that no or no available downlink resource for scheduling the UE to transmit the downlink data exists on the U-Cell, the L-Cell replaces the U-Cell to retransmit the downlink data.

In combination with the tenth possible implementation manners of the fourth aspect, in an eighteenth possible implementation manner,

In combination with the tenth possible implementation manners of the fourth aspect, in a nineteenth possible implementation manner,

With reference to any of the seventeenth through nineteenth possible implementations of the fourth aspect, in a twentieth possible implementation,

the transceiver module is further configured to: after receiving downlink data transmission performed by the network equipment through an HARQ process Y of a U-Cell, receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network equipment through the L-Cell;

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

the cross HARQ entity/cross cell retransmission scheduling signaling comprises:

indication information of cross-HARQ entity/cross-cell retransmission, wherein the indication information of cross-HARQ entity/cross-cell retransmission is used for indicating: the cross-HARQ entity/cross-cell retransmission scheduling signaling is used for scheduling the current UE to receive the retransmission of downlink data on the cell which uses the unlicensed spectrum and is communicated with the current UE from the cell which uses the licensed spectrum and is communicated with the current UE;

an identification of the U-Cell;

identification of the HARQ process Y.

With reference to any of the seventeenth through twenty possible implementations of the fourth aspect, in a twenty-second possible implementation,

In combination with the tenth possible implementation manner of the fourth aspect, in a twenty-third possible implementation manner,

the transceiver module is further configured to: prior to receiving a retransmission of the downlink data by the network device over the L-Cell,

receiving U-Cell configuration information sent by the network device, wherein the U-Cell configuration information comprises:

HARQ process identification usable by the UE on the U-Cell; or

A range of HARQ process identities usable by the UE on the U-Cell; or

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

the transceiver module is further configured to: after receiving downlink data transmission performed by a network device through an HARQ process Y of a U-Cell, receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through the L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling comprises: an identification of the HARQ process Y;

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

With reference to the twenty-third or twenty-fourth possible implementation manner of the fourth aspect, in a twenty-fifth possible implementation manner,

With reference to any of the tenth th through twenty-fifth possible implementations of the fourth aspect, in a twenty-sixth possible implementation,

the transceiver module is further configured to receive indicating information sent by the network device when there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, wherein the indicating information is used for indicating to the UE that there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data;

the processing module is further configured to determine, after the transceiver module receives the th indication message:

receiving retransmission of the downlink data of HARQ process Y of the U-Cell from a Cell using a licensed spectrum communicating with a current UE; or a retransmission of all HARQ processes on the U-Cell needs to be received from a Cell using a licensed spectrum communicating with a current UE; or a retransmission of a designated HARQ process on the U-Cell needs to be received from a Cell using the licensed spectrum communicating with the current UE.

With reference to any of the tenth th through twenty-fifth possible implementations of the fourth aspect, in a twenty-seventh possible implementation,

the transceiver module is also used for receiving th indication information sent by the network equipment;

the processing module is further used for determining, according to the th indication information:

when no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists on the U-Cell, receiving retransmission of the downlink data of an HARQ process Y of the U-Cell from a Cell which communicates with the current UE and uses a licensed spectrum; or

When there is no or lack of available downlink resources on the U-Cell for scheduling the current UE to transmit the downlink data, receiving retransmission of the downlink data of all HARQ processes on the U-Cell from a Cell using a licensed spectrum, which is in communication with the current UE; or

When there is no or lack of available downlink resources on the U-Cell for scheduling the current UE to transmit the downlink data, the downlink data retransmission of the designated HARQ process on the U-Cell needs to be received from a Cell using a licensed spectrum, which is in communication with the current UE.

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

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 the Cell using the authorized spectrum communicating with the current UE, the processing module determines that retransmission of the downlink data of the designated HARQ process on the U-Cell needs to be received from the Cell using the authorized spectrum communicating with the current UE

With reference to any of the twenty-sixth through twenty-eight possible implementations of the fourth aspect, in a twenty-ninth possible implementation,

the transceiver module is further configured to receive second indication information sent by the network device, where the second indication information is used to indicate: 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 receiving the second indication information; or

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

With reference to any of the tenth th through twenty-ninth possible implementations of the fourth aspect, in a thirtieth possible implementation,

the transceiver module is further configured to: after receiving the downlink data transmission resumed by the network device through the L-Cell, after a timing synchronization timer TAT of a time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, sending feedback information for retransmission of the downlink data of the HARQ process Y to the network device.

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

the processing module is further configured to:

sending the retransmitted data of the downlink data received by the transceiver module to an HARQ entity corresponding to the U-Cell of the UE, and combining the retransmitted data with data in a cache of the HARQ process Y of the U-Cell; or

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

the processing module is further configured to: before data in a cache of the HARQ process Y of the U-Cell of the UE is sent to an HARQ entity corresponding to the L-Cell of the UE and is combined with the received data of the retransmission of the downlink data,

after the transceiver module receives the retransmitted data of the downlink data, caching the received retransmitted data into the established th cache;

With reference to the thirty th possible implementation manner of the fourth aspect, in a thirty third possible implementation manner,

before the data combination with the retransmission of the downlink data received by the transceiver module, when an HARQ entity corresponding to the L-Cell receives the downlink data of the HARQ process Y of the U-Cell, establishing an th cache of the L-Cell for the HARQ process Y or a th cache of the HARQ process corresponding to the L-Cell for transmitting the retransmission of the downlink data, and caching the received data of the HARQ process Y of the U-Cell into the th cache;

With reference to any of the thirty-third possible implementations of the fourth aspect, in a thirty-fourth possible implementation,

the processing module is further configured to:

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

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

performing initial transmission of downlink data to User Equipment (UE) through a hybrid automatic repeat request (HARQ) process Y of an unlicensed Cell U-Cell;

determining that the retransmission mode of the downlink data is retransmission through an authorized Cell L-Cell; and are

And retransmitting the downlink data to the UE through the L-Cell.

With reference to the fifth aspect, in an possible implementation manner, before the retransmitting, by the L-Cell, the downlink data to the UE, the method further includes:

and sending cross-HARQ entity/cross-Cell transmission configuration information to the UE, wherein the cross-HARQ entity/cross-Cell transmission configuration information is used for indicating that the retransmission mode of the downlink data of the UE is retransmission through an L-Cell.

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

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

With reference to any of the th possible implementation manner to the third possible implementation manner of the fifth aspect, in a fourth possible implementation manner, after the initial transmission of downlink data to the UE through the HARQ process Y of the U-Cell, the method further includes:

the retransmitting the downlink data to the UE through the L-Cell includes:

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 comprises:

indication information of retransmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

With reference to the fourth or fifth possible implementation manner of the fifth aspect, in a sixth possible implementation manner, before the performing initial transmission of downlink data to the UE through the HARQ process Y of the U-Cell, the method further includes:

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

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

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

indication information of initial transmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

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

after the retransmitting the downlink data to the UE through the L-Cell, the method further includes:

and after determining that the TAT of the timing synchronization timer of the time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, waiting for feedback information which is sent by the UE and aims at retransmission of the downlink data.

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

transmitting downlink data to User Equipment (UE) through a hybrid automatic repeat request (HARQ) process Y of an unlicensed Cell U-Cell;

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

and transmitting the downlink data to the UE again through the L-Cell.

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

the determining to retransmit the downlink data to the UE through the L-Cell includes: determining that initial transmission and retransmission of the downlink data are performed to the UE through the L-Cell;

the retransmitting, to the UE, the downlink data through the L-Cell includes:

and performing initial transmission and retransmission of the downlink data to the UE through the L-Cell.

With reference to possible implementation manners of the sixth aspect, in a second possible implementation manner, the transmitting downlink data to the UE through the HARQ process Y of the U-Cell includes:

With reference to th or the second possible implementation manner of the sixth aspect, in a third possible implementation manner,

before the initial transmission and retransmission of the downlink data to the UE through the L-Cell, the method further includes:

With reference to th or the second possible implementation manner of the sixth aspect, in a fourth possible implementation manner,

With reference to th possible implementation manner or the second possible implementation manner of the sixth aspect, in a fifth possible implementation manner,

With reference to any of the third to fifth possible implementations of the sixth aspect, in a sixth possible implementation,

after the determining that the initial transmission and retransmission of the downlink data are performed to the UE through an authorized Cell L-Cell, and before the performing the initial transmission and retransmission of the downlink data to the UE through the L-Cell, the method further includes:

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

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

the retransmitting, to the UE, the downlink data through the L-Cell includes:

and retransmitting the downlink data to the UE through the L-Cell.

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

With reference to the ninth possible implementation manner of the sixth aspect, in a tenth possible implementation manner, before the retransmitting the downlink data to the UE through the HARQ process X of the L-Cell, the method further includes:

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

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

With reference to any of the tenth to twelfth possible implementations of the sixth aspect, in a thirteenth possible implementation,

after the HARQ process Y of the U-Cell transmits downlink data to the UE, the method further includes:

the retransmitting the downlink data to the UE through the HARQ process X of the L-Cell includes: and retransmitting the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

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

before the retransmitting the downlink data to the UE through the L-Cell, the method further includes:

sending cross-HARQ entity/cross-cell retransmission configuration information to the UE, wherein the cross-HARQ entity/cross-cell retransmission configuration information is used for indicating the UE to: and when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, 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 a fifteenth possible implementation manner,

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

With reference to any of the fourteenth to sixteenth possible implementations of the sixth aspect, in a seventeenth possible implementation,

the retransmitting the downlink data to the UE through the L-Cell includes: and retransmitting the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

With reference to the seventeenth possible implementation manner of the sixth aspect, in an eighteenth possible implementation manner,

the cross HARQ entity/cross cell retransmission scheduling signaling comprises:

an identification of the U-Cell;

identification of the HARQ process Y.

With reference to any 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,

HARQ process identification usable by the UE on the U-Cell; or

A range of HARQ process identities usable by the UE on the U-Cell; or

With reference to the twentieth possible implementation manner of the sixth aspect, in a twentieth possible implementation manner, after the transmitting downlink data to the UE through the HARQ process Y of the U-Cell, the method further includes:

the identifier of the HARQ process Y indicates that the UE determines that the cross-HARQ entity/cross-Cell retransmission scheduling signaling is used for scheduling the UE to receive the retransmission of the downlink data from the L-Cell according to the received U-Cell configuration information;

the retransmitting the downlink data to the UE through the L-Cell includes retransmitting the downlink data to the UE on a downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

With reference to the twentieth or twenty possible implementations of the sixth aspect, in a twenty-second possible implementation,

With reference to any of the eighth to twenty-second possible implementations of the sixth aspect, in a twenty-third possible implementation,

further comprising:

With reference to any of the eighth to twenty-second possible implementations of the sixth aspect, in a twenty-fourth possible implementation,

further comprising transmitting th indication information to the UE, wherein the th indication information is used for indicating the UE to:

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

With reference to any of the twenty-third to twenty-fifth possible implementations of the sixth aspect, in a twenty-sixth possible implementation,

further comprising:

With reference to any of the eighth to twenty-sixth possible implementations of the sixth aspect, in a twenty-seventh possible implementation,

In a seventh aspect, an embodiment of the present invention provides methods for transmitting downlink data, where the methods include:

receiving initial transmission of downlink data sent by a network device through a hybrid automatic repeat request HARQ process Y of an unlicensed Cell U-Cell;

With reference to the seventh aspect, in an th possible implementation manner,

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

receiving cross-HARQ entity/cross-Cell transmission configuration information sent by the network equipment, and determining that the retransmission mode of the downlink data is retransmission through an L-Cell according to the received cross-HARQ entity/cross-Cell transmission configuration information.

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

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

the retransmission mode of the downlink data retransmitted through the L-Cell is preset, and the L-Cell is a primary Cell PCell communicated with the current UE.

With reference to any of the th through third possible implementations of the seventh aspect, in a fourth possible implementation,

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

receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network equipment through the L-Cell, and determining to receive retransmission of the downlink data from the L-Cell according to the received cross-HARQ entity/cross-Cell retransmission scheduling signaling;

the receiving, by the network device, retransmission of the downlink data through the L-Cell includes: receiving retransmission of the downlink data on downlink resources on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

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 comprises:

indication information of retransmission;

an identification of the U-Cell; and

identification 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 receiving 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 a cross-carrier scheduling signaling sent by the network equipment through the U-Cell, and determining to receive initial transmission of the downlink data from an HARQ process Y on the U-Cell according to the received cross-carrier scheduling signaling;

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

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

the cross-carrier scheduling signaling comprises the following steps:

indication information of initial transmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

With reference to the seventh aspect, or any of the th through seventh possible implementations of the seventh aspect, in an eighth possible implementation,

after the receiving of the retransmission of the downlink data by the network device through the L-Cell, further comprising:

and after a timing synchronization timer TAT of a time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, sending feedback information aiming at retransmission of the downlink data to the network equipment.

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

sending the received retransmitted data of the downlink data to an HARQ entity corresponding to the U-Cell of the current UE, and combining the data with the data in the cache of the HARQ process Y of the U-Cell; or

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

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

before the combining with the received retransmitted data of the downlink data, the method further includes:

when receiving the cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through the L-Cell, establishing th cache of the HARQ process Y of the L-Cell for the U-Cell or th cache of the HARQ process corresponding to the L-Cell for transmitting the retransmission of the downlink data;

after receiving the retransmitted data of the downlink data, caching the received retransmitted data into the established th cache;

the combining with the received retransmitted data of the downlink data comprises combining with the retransmitted data received and buffered in the th buffer.

when the HARQ entity corresponding to the L-Cell receives the downlink data of the HARQ process Y of the U-Cell, establishing th cache of the L-Cell for the HARQ process Y or th cache of the HARQ process corresponding to the L-Cell for transmitting retransmission of the downlink data, and caching the received data of the HARQ process Y of the U-Cell into the th cache;

the combining with the received retransmitted data comprises combining the data of the HARQ process Y of the U-Cell received and buffered in the th buffer with the received retransmitted data when receiving the retransmitted data of the HARQ process Y transmitted by the network device through the L-Cell.

With reference to any of the ninth to tenth possible implementations of the seventh aspect, in a twelfth possible implementation,

after the sending 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, the method further includes:

and 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 an method for transmitting downlink data, including:

receiving the transmission of downlink data by the network equipment through a hybrid automatic repeat request HARQ process Y of an unauthorized Cell U-Cell;

determining that no or lack of available downlink resources for scheduling the current User Equipment (UE) to transmit the downlink data exists on the U-Cell, and determining that the network equipment receives the downlink data transmission performed again through an authorized Cell (L-Cell);

and receiving the downlink data transmission which is carried out again by the network equipment through the L-Cell.

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

the determining to receive, through the L-Cell, the transmission of the downlink data resumed by the network device includes: determining to receive initial transmission and retransmission of the downlink data by the network device through the L-Cell;

the receiving, by the network device, the transmission of the downlink data resumed by the L-Cell includes:

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

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

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

With reference to th or the second possible implementation manner of the eighth aspect, in a third possible implementation manner,

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

receiving cross-HARQ entity/cross-Cell transmission configuration information sent by the network equipment, and determining that the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data when no or no available downlink resource for scheduling the current UE to transmit the downlink data exists on the U-Cell according to the cross-HARQ entity/cross-Cell transmission configuration information.

With reference to th or the second possible implementation manner of the eighth aspect, in a fourth 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 transmission mode of the L-Cell for performing initial transmission and retransmission of the downlink data instead of the U-Cell is preset.

With reference to th or the second possible implementation manner of the eighth aspect, in a fifth possible implementation manner,

when there is no available downlink resource or lack of available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, a transmission mode of the L-Cell for performing initial transmission and retransmission of the downlink data instead of the U-Cell is preset, and the L-Cell is a primary Cell PCell in communication with the current UE.

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

after the determining that the initial transmission and retransmission of the downlink data by the network device are received through the L-Cell, and before the receiving the initial transmission and retransmission of the downlink data by the network device through the L-Cell, further comprising:

receiving th resource status indication message sent by the network equipment, wherein the th resource status indication message is used for indicating that the current UE has no or lacks available downlink resources for scheduling the current UE to transmit the downlink data on the U-Cell:

determining, after receiving the th resource status indication message, that initial transmission and retransmission of the downlink data need to be received from a cell using a licensed spectrum in communication with the current UE, or

Starting a timer after receiving the resource status indication message, and determining that initial transmission and retransmission of the downlink data need to be received from a Cell using a licensed spectrum in communication with a current UE if there is no downlink resource or lack of available downlink resources for scheduling the current UE to transmit the downlink data in the U-Cell before the timer expires.

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

the method also comprises the steps of receiving th resource status indication message sent by the network equipment, wherein the th resource status indication message is used for indicating that no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists on the U-Cell after th effective time length;

determining that initial transmission and retransmission of the downlink data need to be received from a cell using a licensed spectrum in communication with a current UE after a -th valid time period after receiving the -th resource status indication message, or

After the valid time length after the th resource status indication message is received, starting a th timer, and before the th timer expires, if there is no downlink resource available on the U-Cell or there is no available downlink resource available on the U-Cell for scheduling the current UE to transmit the downlink data, determining that initial transmission and retransmission of the downlink data need to be received from a Cell using a licensed spectrum, which is in communication with the current UE.

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

after the determining that the initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum, which is in communication with the current UE, the method further includes:

emptying the buffer of the HARQ process Y on the U-Cell.

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

receiving a second resource status indication message sent by the network device, where the second resource status indication message is used to indicate a current UE: available downlink resources for scheduling the current UE to transmit the downlink data exist on the U-Cell;

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

And starting a second timer after receiving the second resource state indication message, and determining that the downlink data needs to be received from the U-Cell if available downlink resources for scheduling the current UE to transmit the downlink data still exist on the U-Cell after the second timer is overtime.

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

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.

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

the receiving, by the network device, the transmission of the downlink data resumed through the L-Cell includes:

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

the receiving, by the network device, retransmission of the downlink data through the L-Cell includes:

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

before the receiving of the retransmission of the downlink data by the network device through HARQ process X of the L-Cell, further comprising:

receiving configuration information of cross-HARQ entity/cross-cell retransmission sent by the network equipment, and determining according to the configuration information of cross-HARQ entity/cross-cell retransmission: and when no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

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

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

With reference to any of the thirteenth to fifteenth possible implementations of the eighth aspect, in a sixteenth possible implementation,

after the receiving network device transmits downlink data through HARQ process Y of U-Cell, the method further includes:

the receiving, by the network device, retransmission of the downlink data by HARQ process X of the L-Cell includes: receiving retransmission of the downlink data on downlink resources on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

With reference to the tenth possible implementation manners of the eighth aspect, in a seventeenth possible implementation manner,

receiving configuration information sent by the network equipment and used for sending cross-HARQ entity/cross-Cell retransmission, and determining that the L-Cell replaces the U-Cell to retransmit the downlink data when no available downlink resource used for scheduling the current UE to transmit the downlink data exists or lacks on the U-Cell according to the cross-HARQ entity/cross-Cell retransmission configuration information.

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

and when no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists in the U-Cell, the transmission mode of the L-Cell for performing retransmission of the downlink data in place of the U-Cell is preset.

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

when no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists on the U-Cell, the transmission mode of the L-Cell for replacing the U-Cell to retransmit the downlink data is preset; the L-Cell is a primary Cell PCell communicated with the current UE.

With reference to any of the seventeenth through nineteenth possible implementations of the eighth aspect, in a twentieth possible implementation,

receiving a cross HARQ entity/cross Cell retransmission scheduling signaling sent by the network equipment through the L-Cell;

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

the cross HARQ entity/cross cell retransmission scheduling signaling comprises:

an identification of the U-Cell;

identification of the HARQ process Y.

With reference to any of the seventeenth through twenty possible implementations of the eighth aspect, in a twenty-second possible implementation,

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

HARQ process identification which can be used by the current UE on the U-Cell; or

The range of HARQ process identifications which can be used by the current UE on the U-Cell; or

And starting HARQ process identification in the usable HARQ process identification of the current UE on the U-Cell.

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

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

receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through the L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling comprises: an identification of the HARQ process Y;

determining that the cross-HARQ entity/cross-Cell retransmission scheduling signaling is used for scheduling the current UE to receive the retransmission of the downlink data from the L-Cell according to the received U-Cell configuration information;

With reference to the twenty-third or twenty-fourth possible implementation manners of the eighth aspect, in a twenty-fifth possible implementation manner,

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

receiving th indication information sent by the network equipment when no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists on the U-Cell, wherein the th indication information is used for indicating the current UE that no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists on the U-Cell;

after receiving the th indication information, determining that the retransmission of the downlink data of the HARQ process Y of the U-Cell needs to be received from the Cell which uses the authorized spectrum and communicates with the current UE, or the retransmission of all the HARQ processes on the U-Cell needs to be received from the Cell which uses the authorized spectrum and communicates with the current UE, or the retransmission of the designated HARQ process on the U-Cell needs to be received from the Cell which uses the authorized spectrum and communicates with the current UE.

With reference to any of the tenth th through twenty-fifth possible implementation manners of the eighth aspect, in a twenty-seventh possible implementation manner, the method further includes:

receiving th indication information sent by the network equipment;

determining from the th indication information:

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

if it is determined that 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 communicating with the current UE, then

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

receiving second indication information sent by the network device, where the second indication information is used to indicate: 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 receiving the second indication information; or

Receiving second indication information sent by the network equipment, and determining according to the second indication information: and when available downlink resources used 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.

With reference to any of the tenth th through twenty-ninth possible implementations of the eighth aspect, in a thirtieth possible implementation,

after the receiving of the transmission of the downlink data resumed by the network device through the L-Cell, the method further includes:

and after a timing synchronization timer TAT of a time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, sending feedback information aiming at retransmission of downlink data of the HARQ process Y to the network equipment.

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

With reference to the thirty th possible implementation manner of the eighth aspect, in a thirty second possible implementation manner,

With reference to the thirty th possible implementation manner of the eighth aspect, in a thirty third possible implementation manner,

With reference to any of the thirty-third possible implementations of the eighth aspect, in a thirty-fourth possible implementation,

In the embodiment of the invention, the network equipment such as a base station transmits the downlink data to the UE by using the unlicensed Cell U-Cell of the unlicensed spectrum, and retransmits the downlink data to the UE or retransmits the downlink data to the UE by using the licensed Cell L-Cell of the licensed spectrum, so that the problem of overlarge delay of a part of data packets transmitted on the unlicensed spectrum caused by lack of resources on the unlicensed spectrum is avoided.

Drawings

Fig. 1 is a timing diagram of a downlink HARQ process in a current LTE system;

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

FIGS. 3A-3D are schematic views of an LAA scene;

fig. 4 is a schematic view of carrier aggregation;

fig. 5 is a diagram illustrating ways in which a user equipment communicates with a network device in an embodiment of the present invention;

fig. 6 is a schematic diagram of th indicating information sent by a base station according to an embodiment of the present invention;

FIG. 7 is a flowchart of example ;

FIG. 8 is a flowchart of the second embodiment;

FIG. 9 is a flowchart of a third embodiment;

FIG. 10 is a flowchart according to a fourth embodiment;

FIG. 11 is a flowchart of a fifth embodiment;

fig. 12 is a schematic structural diagram of an th network device according to an embodiment of the present invention;

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

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

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

fig. 16 is a schematic structural diagram of an th ue according to an embodiment of the present invention;

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

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

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

fig. 20 is a flowchart of an th 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, a wireless communication system provided by the embodiment of the present invention is introduced, and then a network device and a user equipment provided by the embodiment of the present invention are introduced respectively; finally, two downlink data transmission methods provided by the embodiment of the 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, wherein,

the network device 201 is configured to transmit downlink data to the user equipment 202 through the HARQ process Y of the unlicensed Cell U-Cell, and retransmit the downlink data or retransmit the downlink data through the licensed Cell L-Cell;

the user equipment 202, configured to receive the downlink data sent by the network device 201 through the HARQ process Y of the U-Cell; receiving the downlink data retransmitted by the network device 201 through the L-Cell, or receiving a retransmission of the downlink data;

the U-Cell is a Cell using an unlicensed spectrum, and the L-Cell is a Cell using a licensed spectrum.

In the embodiment of the present invention, the communication system that may be adopted by the wireless communication system 20 includes, but is not limited to, the following communication systems:

global System for Mobile communications (GSM), Code Division Multiple Access (CDMA) IS-95, CDMA 2000, Time Division Synchronous Code Division Multiple Access (TD-SCDMA), Wideband Code Division Multiple Access (WCDMA), Time Division duplex-Long Term Evolution (TDD LTE), Frequency Division duplex-Long Term Evolution (Frequency Division Multiple Access, FDD), Long Term Evolution-enhancement (Long Term Evolution-Advanced, LTE), Personal telephone System (Personal area telephone System 802), wireless fidelity (WiFi) protocol (WiFi-11, etc.

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

Such as: for LTE systems 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 TD-SCDMA systems or WCDMA systems, the network device 201 in the wireless communication system 20 may include: node b (NodeB), or includes NodeB and Radio Network Controller (RNC); for the GSM system, the network device 201 in the wireless communication system 20 may include a Base Transceiver Station (BTS), or a BTS and a 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 communication scenario between the network device 201 and the user equipment 202 in the embodiment of the present invention may include, but is not limited to, the following four scenarios:

scene

As shown in fig. 3A, a licensed carrier F1 is deployed on a macro cell (macro cell), an unlicensed carrier F3 is deployed on a small cell (smallcell), and then the macro cell and the small cell are connected via an ideal transmission network. In this way, with the assistance of the macro cell F1 Carrier, the unlicensed carriers F3 of the small cells may be aggregated for use in a manner such as Carrier Aggregation (CA).

Scene two

As shown in fig. 3B, a licensed carrier F2 and an unlicensed carrier F3 are deployed on the small cell, respectively. In this way, with the assistance of the licensed carrier F2, the unlicensed carrier F3 may also be aggregated for use, such as carrier aggregation.

Scene three and scene four

In scenario 3 as shown in fig. 3C and scenario 4 as shown in fig. 3D, similarly, the unlicensed carrier F3 may be aggregated with the assistance of the licensed carriers F1 or F2, such as carrier aggregation, to serve the user equipment 202.

In order to meet the requirement of International mobile telephone System-enhanced (IMT-Advanced) and support high-speed data rate, Carrier aggregation is introduced, and the main idea of Carrier aggregation is to aggregate a plurality of Component Carriers (CCs) into carriers with larger bandwidth to support high-speed data transmission rate, as shown in fig. 4 below, in downlink (base station transmission, user equipment reception) for example, the downlink bandwidth of the System can be aggregated by 5 carriers of 20MHz, and in Carrier aggregation, CCs are also called cells (Cell).

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

The following describes an embodiment of the present invention in detail, taking the transmission method shown in fig. 5 as an example.

In fig. 5, a network device 201, here taking an eNB in an LTE system as an example, configures an L-Cell and a U-Cell for data transmission for a user equipment 202, where the L-Cell is located at a macro base station, i.e., the eNB, and the U-Cell is located at a small Cell. The macro base station and the small cell are connected through an ideal transmission network (ideal backhaul), i.e., the transmission delay between the macro base station and the small cell is negligible.

Wherein, the L-Cell is responsible for assisting the U-Cell to transmit data. And the UE acquires the scheduling information of the resource of the U-Cell from the eNB and then uses the scheduled resource on the U-Cell for data transmission. Meanwhile, the UE can also use resources on the L-Cell for data transmission according to the scheduling of the eNB on the L-Cell.

In the embodiment of the invention, the HARQ processes Y of U-cells can be replaced by the HARQ processes X of L-cells for initial transmission and/or retransmission, or the HARQ processes Y of U-cells can be replaced by a plurality of HARQ processes of L-cells, for example, X is₁，X₂，…，X_nPerforming alternative initial transmission and/or retransmission, or multiple HARQ processes Y of U-cells₁，Y₂，…，Y_mMultiple HARQ processes X that may consist of L-cells₁，X₂，…，X_nAnd correspondingly, carrying out the replacement initial transmission and/or retransmission in sequence, wherein m and n are positive integers.

In the following description, an example of performing alternative initial transmission and/or retransmission by using HARQ processes X as HARQ processes Y is described, and other cases are the same and will not be described herein again.

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 buffers to buffer the downlink data sent by the network device 201.

In this embodiment of the present invention, the downlink data of the HARQ process Y may be any Redundancy Versions (RVs) of the downlink data.

For ease of understanding, the LTE system is taken as an example herein to illustrate the related concepts of the HARQ process. In the LTE system, different cells (cells) respectively establish independent Hybrid Automatic repeat request (HARQ) entities, and HARQ processes on the mutually independent HARQ entities are also mutually independent. The HARQ function is realized in the MAC layer and has the following characteristics:

-employing a multi-process stop-wait mode;

-transmitting/retransmitting for Transport Blocks (TB);

in the downlink direction, i.e. the direction in which a network device, such as a base station, transmits data to a User Equipment (UE), the following features are provided:

the HARQ mode is asynchronous and adaptive, i.e. retransmission does not occur at a fixed time relative to the initial transmission, and the modulation scheme or coding scheme can be flexibly changed;

-HARQ process number is carried by the signalling of the Physical Downlink Control CHannel (PDCCH) and indicates whether to initiate transmission or retransmission;

uplink acknowledgement information (ACK/NACK) for feeding back the reception status of the downlink initial transmission or retransmission is sent on a Physical Uplink Control CHannel (PUCCH) or a Physical Uplink Shared CHannel (PUSCH).

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

In the following description, the five implementations listed in table 1 are distinguished and illustrated separately, and for each implementations, examples are illustrated separately.

The embodiments -five differ in the detailed implementation, and the features of these five embodiments and the corresponding figures are summarized in table 1.

TABLE 1

Each implementation is described in detail below by .

Implementation

And the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

In an implementation , the eNB performs resource contention on the unlicensed carrier, and when the eNB contends for the resource, the UE may be allocated with the resource on the U-Cell for data transmission.

The eNB can determine to retransmit the downlink data to the UE through the HARQ process X of the L-Cell when determining that no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell.

Such as: the eNB sends configuration information of cross-HARQ entity/cross-cell retransmission to the UE, and indicates the UE to: when no or lack of available downlink resources for scheduling UE to transmit the downlink data exists on the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data; and the UE determines that no or no available downlink resource for scheduling the UE to transmit the downlink data exists on the U-Cell according to the received cross-HARQ entity/cross-Cell transmission configuration information, and the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

For another example: when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, the transmission mode that the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data is preset;

when the transmission mode of the retransmission is preset, optionally, the L-Cell may be a primary Cell PCell in communication with the UE.

Wherein the eNB may lack or lack available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell when the following conditions are satisfied:

there is no resource on the U-Cell for any HARQ processes for scheduling the UE, or

There are no resources on the U-Cell for scheduling HARQ process X for the UE; or

Lack of resources on the U-Cell for any HARQ processes for scheduling the UE, such as the available duration of the resources being less than a preset resource available duration threshold, or

There is a lack of resources on the U-Cell for scheduling HARQ X processes for the UE, such as: the available time of the resource is less than the preset threshold value of the available time of the resource.

Optionally, after transmitting downlink data to the UE through HARQ process Y of the U-Cell, the method further includes:

the eNB sends cross-HARQ entity/cross-Cell retransmission scheduling signaling to the UE through the L-Cell, such as: PDCCH scheduling signaling, wherein the signaling comprises:

identification of HARQ process X;

the HARQ process identity is used to instruct the UE to: and combining the retransmission data of the downlink data scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling with the downlink data on the HARQ process Y according to the transmission mode that the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

The eNB retransmits the downlink resource scheduled by the scheduling signaling at the cross-HARQ entity/cross-cell, such as: and retransmitting the downlink data to the UE on the downlink physical resource. And 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 a corresponding HARQ process X according to an identifier of the HARQ process X in the cross-HARQ entity/cross-Cell retransmission scheduling signaling, determines a transmission mode of the downlink data according to the mode that the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data, and optionally, in an implementation mode , the HARQ process X is not used for transmitting data of the HARQ process of the UE and is only used for replacing retransmission.

Optionally, the eNB may send th indication information to the UE when there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, wherein the th indication information is used for indicating the UE to:

the UE needs to receive the retransmission of the downlink data of the HARQ process Y of the U-Cell from a Cell which is communicated with the UE and uses the authorized frequency spectrum; or the UE needs to receive the retransmission of the downlink data of all HARQ processes on the U-Cell from a Cell which is communicated with the UE and uses the authorized frequency spectrum; or the UE needs to receive a retransmission of downlink data of a designated HARQ process on the U-Cell from a Cell using a licensed spectrum communicating with the UE.

Or, the eNB may send th indication information to the UE, and optionally, the eNB may send th indication information when configuring the U-Cell for the UE, where th indication information is used to indicate that the UE:

when there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the UE needs to receive retransmission of the downlink data of the HARQ process Y of the U-Cell from a Cell which uses a licensed spectrum and is communicated with the UE; or

When there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the UE needs to receive retransmission of the downlink data of all HARQ processes on the U-Cell from a Cell which is communicated with the UE and uses a licensed frequency spectrum; or

When there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the UE needs to receive a retransmission of the downlink data of the designated HARQ process on the U-Cell from a Cell using the licensed spectrum, which is in communication with the UE, optionally, the indicating information may further include identification information of the designated HARQ process at this time.

For example, octet (octet) octet shown in FIG. 6 may be included in the indicating information:

in the octet, H1-H7 respectively indicate 1 st to 8 th HARQ processes, and then a corresponding bit position "0" indicates that the HARQ process does not perform an inter-HARQ entity/inter-cell retransmission, and a corresponding bit position "1" indicates that the HARQ process performs an inter-HARQ entity/inter-cell retransmission.

Optionally, the eNB may also schedule the UE to transmit the downlink data when there is available downlink resource on the U-Cell, such as: and when resources of all HARQ processes for scheduling the UE exist or resources of an HARQ process Y for scheduling the UE exist, sending second indication information to the UE, wherein the second indication information is used for indicating the UE to: receiving the downlink data of the HARQ process Y from the U-Cell; or

The eNB sends second indication information to the UE, wherein the second indication information is used for indicating the UE to: and when available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell, receiving the downlink data of the HARQ process Y from the U-Cell.

Optionally, the second indication information indicating that the UE receives the downlink data of 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 HARQ process Y through HARQ process X of L-Cell, the UE combines the received retransmission data with the downlink data previously transmitted on U-Cell.

Before receiving the retransmission data of the downlink data of the HARQ process Y through the HARQ process X of the L-Cell, the UE may already receive the retransmission data of the downlink data on the U-Cell, and generally, after receiving the retransmission data, the UE combines the retransmission data with the data of the HARQ process Y on the U-Cell and then caches the combined data, so that after receiving the retransmission data through the L-Cell, possible situations are that the received retransmission data is combined with the cached data that may have been previously combined.

Specifically, the UE may adopt the following several processing manners:

processing mode

The UE sends the received retransmission data to HARQ entities corresponding to the U-Cell (wherein, the cells correspond to HARQ entities on the UE) of the UE, and the retransmission data are combined with data in a cache of an HARQ process Y of the U-Cell;

treatment method two

The UE sends the data in the cache of the HARQ process Y of the U-Cell to the HARQ entity of the L-Cell and combines the data with the received retransmitted data; optionally, after sending the data in the buffer of HARQ process Y of the own U-Cell to the HARQ entity of the L-Cell, the UE may also empty the data in the buffer of HARQ process Y of the own U-Cell.

Optionally, for the second processing mode, the UE may establish a th cache for HARQ process X of the L-Cell when receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the eNB through the L-Cell, cache the received retransmitted data into the established th cache after receiving the retransmitted data, and combine the retransmitted data received and cached into the th cache when combining with the received retransmitted data, or

The UE can establish th cache aiming at the HARQ process X of the L-Cell when the HARQ entity of the L-Cell receives the data of the HARQ process Y of the U-Cell, cache the received data of the HARQ process Y of the U-Cell into th cache, and combine the data of the HARQ process Y of the U-Cell received and cached into the th cache with the received retransmitted data when the retransmitted data of the HARQ process Y transmitted by the eNB through the L-Cell are received.

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

before the eNB determines that a Timing Alignment Timer (TAT) of a Timing Advance Group (TAG) where the U-Cell is located is overtime, feedback information which is sent by the UE and aims at retransmission of the downlink data of the HARQ process Y is not received; and are

And after determining that the TAT of the timing synchronization timer of the time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, waiting for feedback information which is sent by the UE and aims at retransmission of the downlink data of the HARQ process Y.

And after the timing synchronization timer TAT of the time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, the UE still sends feedback information aiming at retransmission of the downlink data of the HARQ process Y to the network equipment.

Where the TAG is composed of or more serving cells that may share Timing Advance (TA) values, i.e., all cells within TAGs may use identical TA values.

In the current LTE system, when a Timing Alignment Timer (TAT) of Timing Advance Groups (TAGs) times out, HARQ entities of cells in the TAGs will not feed back ACK/NACK to the physical layer, that is, feedback information for received data.

In the embodiment of the invention, because the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data, if the current method of the LTE system is adopted, the UE does not feed back the retransmission feedback information aiming at the HARQ process Y to the eNB after the TAT of the TAG where the U-Cell is located is overtime, and at the moment, if the TAT of the TAG where the L-Cell is located is not overtime, the eNB cannot receive the feedback information of the downlink data retransmitted by the HARQ process X of the L-Cell replacing the HARQ process Y of the U-Cell.

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

By adopting the implementation , the data retransmission across the HARQ entity/Cell can be realized, thereby ensuring the continuity of the service transmitted on the U-Cell and ensuring good user experience.

specific examples of implementation can be seen in example , infra.

Implementation mode two

In the second implementation manner, the L-Cell replaces the U-Cell to retransmit 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 process numbers of the HARQ entity of the U-Cell and the HARQ process number of the HARQ entity of the L-Cell may be the same.

In the second implementation manner, the eNB performs resource contention on the unlicensed carrier, and when the resources are contended, the eNB may allocate resources to the UE on the U-Cell for data transmission. Specifically, when the eNB competes for resources on the U-Cell, scheduling signaling for scheduling the resources on the U-Cell for data transmission for the UE can be sent to the UE through the L-Cell.

The eNB may determine to retransmit the downlink data to the UE via the L-Cell upon determining that there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data.

Such as: the eNB sends configuration information of cross-HARQ entity/cross-cell retransmission to the UE, and indicates the UE to: when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists in the U-Cell, the L-Cell replaces the U-Cell to retransmit the downlink data; and the UE determines that no or no available downlink resource for scheduling the UE to transmit the downlink data exists on the U-Cell according to the received cross-HARQ entity/cross-Cell transmission configuration information, and the L-Cell replaces the U-Cell to retransmit the downlink data.

For another example: when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists in the U-Cell, the transmission mode of the L-Cell for replacing the U-Cell to retransmit the downlink data is preset;

Similar to the implementation , in the second implementation, the eNB may also perform retransmission of the downlink data of the HARQ process Y 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, and the condition that the eNB determines that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell may refer to the corresponding description in the implementation , and will not be described herein again.

Unlike the implementation , in the second implementation, the specific HARQ process X and HARQ process Y are not specified, and only the HARQ process of which L-cells is used as which U-cells to retransmit the downlink data is specified.

Similar to the implementation , in the second implementation, the eNB may also send cross-HARQ entity/cross-Cell retransmission scheduling signaling, such as PDCCH scheduling signaling, to the UE through the L-Cell, but unlike the implementation , in the second implementation, the cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the eNB is used to instruct the UE to receive retransmission of the downlink data of HARQ process Y of the U-Cell from the L-Cell.

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

indication information for cross HARQ entity/cross cell retransmission,

the indication information of the cross-HARQ entity/cross-cell retransmission is used for indicating: the cross-HARQ entity/cross-cell retransmission scheduling signaling is used for scheduling the UE to receive the retransmission of downlink data on the cell which uses the unlicensed frequency spectrum and communicates with the UE from the cell which uses the licensed frequency spectrum and communicates with the UE;

identification of U-Cell;

identification of HARQ process Y.

And the eNB retransmits the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling. And 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 can judge that: the retransmission scheduling signaling is used for scheduling the UE to receive retransmission of downlink data on a cell which uses an unlicensed frequency spectrum and communicates with the UE from a cell which uses the licensed frequency spectrum and communicates with the UE;

and the UE can judge which HARQ process of which U-Cell the retransmission is directed to according to the identifier of the U-Cell and the identifier of the HARQ process Y, so that the retransmission data is combined with the data of the corresponding HARQ process of the U-Cell after being received.

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

identification of HARQ process X of L-Cell;

and retransmission indication information for indicating that the scheduling signaling is used for scheduling retransmission.

Similar to the implementation , in the second implementation, the eNB may also send the th indication information and the second indication information to the UE, and the contents and sending manner of the two information and the processing manner of the UE may be referred to as implementation , and repeated details are not repeated.

Optionally, the UE may refer to the implementation for processing and combining after receiving the retransmitted data of HARQ process Y through HARQ process X of L-Cell, and the repeated details are not repeated.

Optionally, the eNB may refer to the implementation as well as a manner of receiving, by the eNB, the feedback information for retransmission of the downlink data of the HARQ process Y sent by the UE and a manner of sending the feedback information 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 repeated details are not described again.

By adopting the second implementation mode, the data retransmission across HARQ entities/cells can be realized, so that the continuity of the service transmitted on the U-Cell is ensured, and good user experience is ensured.

For a specific example of implementation manners of the second embodiment, reference may be made to the second embodiment.

Implementation mode three

In the third implementation manner, the L-Cell replaces the U-Cell to retransmit downlink data, 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 resource pool sharing HARQ process numbers, that is, the HARQ entity of the U-Cell and the HARQ entity of the L-Cell have different HARQ process numbers.

In the third implementation manner, the eNB performs resource contention on the unlicensed carrier, and when the resources are contended, the eNB may allocate resources to the UE on the U-Cell for data transmission. Specifically, when the eNB competes for resources on the U-Cell, scheduling signaling for scheduling the resources on the U-Cell for data transmission for the UE can be sent to the UE through the L-Cell.

Similar to the implementation and the implementation two, in the implementation three, the eNB may also retransmit the downlink data to the UE through the L-Cell when there is no available downlink resource or lacks available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, and the condition that the eNB determines that there is no available downlink resource or lacks available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell may refer to the corresponding description in the implementation , and is not described herein again.

Unlike the second implementation and the second implementation, in the third implementation, before the eNB retransmits the downlink data to the UE through the L-Cell, the eNB does not transmit the configuration information of the cross-HARQ entity/cross-Cell retransmission to the UE, but transmits U-Cell configuration information, where the U-Cell configuration information includes:

HARQ process identification which can be used by the UE on the U-Cell; or

The range of HARQ process identifications which can be used by the UE on the U-Cell; or

And the UE identifies the initial HARQ process in the usable HARQ process identifications on the U-Cell.

The above information is used to indicate the range of the identities of HARQ processes that can be used by the U-Cell.

Similar to the implementation and the implementation two, in the implementation three, the eNB may also send cross-HARQ entity/cross-Cell retransmission scheduling signaling, such as PDCCH scheduling signaling, to the UE through the L-Cell, but different from the implementation and the implementation two, in the implementation three, the cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the eNB includes:

the identity of the HARQ process Y is,

and indicating the UE to determine that the cross-HARQ entity/cross-Cell retransmission scheduling signaling is used for scheduling the UE to receive the retransmission of the downlink data of the HARQ process Y from the L-Cell according to the received U-Cell configuration information.

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, so that after receiving the scheduling signaling, the UE determines that the scheduling signaling is used for scheduling downlink transmission on the U-Cell according to the identifier of the HARQ process Y in the scheduling signaling.

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, it can be agreed in advance that, in the downlink data of the HARQ process on the U-Cell, only retransmission will be performed on the L-Cell, initial transmission will not be performed on the L-Cell,

the UE may determine that the scheduling signaling is for scheduling retransmissions. And 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 scheduling signaling may further include an identifier of the L-Cell.

Similar to the implementation and the implementation two, in the implementation three, the eNB may also send the th indication information and the second indication information to the UE, and the contents and the sending manner of the two kinds of information and the processing manner of the UE may be referred to as the implementation , and repeated details are not repeated.

By adopting the third implementation mode, the data retransmission across HARQ entities/cells can be realized, so that the continuity of the service transmitted on the U-Cell is ensured, and good user experience is ensured.

For a third implementation, specific examples can be found in the third embodiment.

Implementation mode four

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

Unlike the third embodiments , in the third embodiments and , the L-Cell performs retransmission of downlink data only in place of the U-Cell, and in the fourth embodiment, regardless of whether the initial transmission of the downlink data is performed on the U-Cell, the initial transmission and retransmission of the downlink data are performed again on the L-Cell.

In the fourth implementation manner, the eNB performs resource contention on the unlicensed carrier, and when the resources are contended, the eNB may allocate the resources to the UE on the U-Cell for data transmission. Specifically, when the eNB competes for resources on the U-Cell, scheduling signaling for scheduling the resources on the U-Cell for data transmission for the UE can be sent to the UE through the L-Cell.

Such as: the eNB sends configuration information of cross-HARQ entity/cross-cell retransmission to the UE, and indicates the UE to: when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data; and the UE determines that the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data when no or no available downlink resource for scheduling the UE to transmit the downlink data is available on the U-Cell according to the received cross-HARQ entity/cross-Cell transmission configuration information.

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

when the transmission modes of the initial transmission and the retransmission are preset, optionally, the L-Cell may be a primary Cell PCell in communication with the UE.

In the fourth implementation manner, optionally, the eNB may send th resource status indication message to the UE when there is no or lack of available downlink resource on the U-Cell for scheduling the UE to transmit the downlink data, where the th resource status indication message is used to indicate that the UE:

no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, determining that the UE needs to receive initial transmission and retransmission of the downlink data from a Cell using the authorized spectrum and communicating with the UE after receiving the th resource state indication message, or

After receiving the th resource status indication message, the UE starts a th timer, and before the th timer expires, if there is no available downlink resource or lack of available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, it determines that initial transmission and retransmission of the downlink data need to be received from a Cell using the licensed spectrum, which is in communication with the UE.

Or, in the fourth implementation manner, the eNB may also send th resource status indication message to 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, where the th resource status indication message is used to indicate the UE that there is no or lack of available downlink resources for scheduling the UE to transmit the downlink data on the U-Cell after the th valid time length;

after receiving the th resource status indication message, the UE determines that the UE needs to receive the initial transmission and retransmission of the downlink data from the cell using the authorized spectrum and communicating with the UE after th valid time length after receiving the message, or

After the UE receives the rd resource status indication message and the th valid time length, the UE starts a th timer, and before the th timer expires, if there is no downlink resource available on the U-Cell or there is no downlink resource available on the U-Cell for scheduling the UE to transmit the downlink data, it determines that the initial transmission and retransmission of the downlink data need to be received from the Cell using the licensed spectrum in communication with the UE.

Optionally, the UE may clear the buffer of HARQ process Y on the U-Cell after determining that initial transmission and retransmission of the downlink data need to be received from the Cell using the licensed spectrum with which the current UE is communicating.

The condition used when the eNB determines that there is no available downlink resource for scheduling the UE to transmit the downlink data in the U-Cell or lack of available downlink resource in the U-Cell may refer to implementation , and details are not described here.

Optionally, when there is available downlink resource on the U-Cell for scheduling the UE to transmit the downlink data, such as: when there is a resource for scheduling each HARQ process of the UE or a resource for scheduling 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 the UE to: available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell;

after receiving the second resource state indication message, the UE determines that downlink data needs to be received from the U-Cell; or the UE starts a second timer after receiving the second resource state indication message, and after the second timer is overtime, if available downlink resources for scheduling the UE to transmit the downlink data still exist on the U-Cell, the UE determines that the downlink data needs to be received from the U-Cell.

Or, when available downlink resources for scheduling the UE to transmit the downlink data exist in 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 to: available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell within the second effective time length;

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

Alternatively, th resource status indication information and the second resource status indication information can be transmitted in of the following messages:

a Radio Resource Control (RRC) message;

a Media Access Control (MAC) Control Element (CE) message;

physical layer control messages.

Implementation mode five

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

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

Such as: the eNB sends configuration information of cross-HARQ entity/cross-cell retransmission to the UE, and indicates the UE to: the downlink data is retransmitted through the L-Cell.

The retransmission mode of the downlink data retransmitted through the L-Cell is preset; at this time, the L-Cell may be a primary Cell PCell with which the UE communicates.

Optionally, in a fifth implementation manner, the eNB may send cross-carrier scheduling signaling to the UE through the U-Cell, for example: and PDCCH scheduling signaling indicates the UE to receive the initial transmission of the downlink data from the U-Cell.

Wherein, the PDCCH scheduling signaling may include:

indication information of initial transmission;

identification of U-Cell; and

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

And the eNB carries out initial transmission of the downlink data to the UE on the downlink resource scheduled by the cross-carrier scheduling signaling, and the UE receives the initial transmission of the downlink data sent by the eNB on the received downlink resource scheduled by the cross-carrier scheduling signaling.

Optionally, the eNB may also send cross-HARQ entity/cross-Cell retransmission scheduling signaling to the UE through the L-Cell, such as: and PDCCH scheduling signaling indicates the UE to receive the retransmission of the downlink data of the HARQ process Y on the U-Cell from the L-Cell.

Wherein, the cross-HARQ entity/cross-cell retransmission scheduling signaling may include:

indication information of retransmission;

identification of U-Cell; and

identification of HARQ process Y.

And 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 retransmission of the downlink data of the HARQ process Y on the U-Cell from the L-Cell according to the received cross-HARQ entity/cross-Cell retransmission scheduling signaling.

And the eNB retransmits the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling, and the UE receives the retransmission of the downlink data on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

By adopting the fifth implementation mode, the data retransmission across HARQ entities/cells can be realized, so that the continuity of the service transmitted on the U-Cell is ensured, and good user experience is ensured.

For a fifth implementation, specific examples can be seen in the fifth embodiment.

In order to better understand and distinguish the five implementation modes, the following five aspects are distinguished and compared.

eNB downlink scheduling mode

The eNB downlink scheduling scheme is shown in table 2 below.

TABLE 2

Scheduling signaling

The transmission mode of the scheduling signaling and the processing of the UE can be seen in table 3 below.

TABLE 3

Corresponding relation of alternative transmission

The correspondence of the alternate transmission can be seen in table 4 below.

TABLE 4

Fourth, indicating information

In the embodiment of the present invention, the indication information is used to indicate the situation of the available resources on the U-Cell, and the content and the sending manner of the indication information can be referred to table 5 below.

TABLE 5

Fifth, technical effects

The five implementation modes provided by the embodiment of the invention can realize cross-HARQ entity/cross-Cell data transmission, and can ensure the continuity of the service transmitted on the U-Cell, thereby ensuring good user experience.

Among them, the implementation -implementation three and the implementation five retransmit the downlink data of the U-Cell through the L-Cell, and the UE combines the retransmitted data with the received previously transmitted downlink data, thereby implementing correct reception of the downlink data.

And the fifth implementation mode is that the U-Cell is fixedly configured to perform initial transmission of downlink data and the L-Cell performs retransmission of the downlink data, so that the implementation mode is simpler.

In the fourth implementation manner, regardless of whether the initial transmission of the downlink data is performed on the U-Cell, the initial transmission and retransmission of the downlink data are performed again on the L-Cell, so that the reliability of data transmission can be further ensured, but the transmission efficiency determined by is lost.

In addition, in the above five implementation manners, except for the third implementation manner, the identifications of the HARQ process X and the HARQ process Y in other implementation manners may be the same.

The five implementation modes are illustrated below by examples to five.

[ example ]

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

s701, the UE receives configuration information of cross-HARQ entity/cross-Cell retransmission sent by the eNB, wherein the configuration information comprises or more L-Cell identifications for performing cross-HARQ entity/cross-Cell retransmission for the U-Cell and an identification of a HARQ process X for performing retransmission on the L-Cell instead of the U-Cell for the HARQ process Y of the U-Cell.

Specifically, HARQ processes Y of U-Cell can be retransmitted instead of HARQ processes X of L-Cell, or HARQ processes Y of U-Cell can be retransmitted instead of HARQ processes of L-Cell, such as X₁，X₂…X_nMultiple HARQ processes Y for U-cells₁，Y₂…Y_mMultiple HARQ processes X that can be performed by L-cells₁，X₂，…X_nAnd correspondingly, performing alternative retransmission in sequence, wherein m and n are positive integers.

In the following, the example is described in which HARQ process Y of U-cells is transmitted instead of HARQ process X of L-cells.

S702: and the eNB carries out resource competition on the unlicensed carrier, and when the resource is competed, the resource is allocated for the UE on the U-Cell for data transmission. Specifically, when the eNB contends for resources on the U-Cell, scheduling information may be sent to the UE through the L-Cell, where the scheduling information is used to schedule the UE for data transmission on the resources on the U-Cell, such as: MAC Protocol Data Unit (PDU).

S703, when the eNB does not have the resource on the U-Cell to schedule the data transmission on the HARQ process Y of the UE, the eNB sends the activation/indication information of the cross-HARQ entity/cross-Cell retransmission to the UE, namely the th indication information.

The indication information may specifically include HARQ process numbers ( types of HARQ process identifiers) for performing the cross-HARQ entity/cross-CELL retransmission, for example, HARQ process Y, or may also explicitly indicate the HARQ process number Y that needs to perform the cross-HARQ entity/cross-CELL retransmission, in this case, the UE only has HARQ processes on the U-CELL, and then the UE starts to acquire the retransmitted data packet on the HARQ process Y of the U-CELL from the HARQ process X of the L-CELL.

Or, all HARQ processes of the current U-Cell may perform cross-HARQ entity/cross-Cell retransmission. The specific process which needs to be retransmitted across HARQ entities/across cells can be specifically indicated by the following indication information. Such as: referring to fig. 6, the activation/indication information of the cross-HARQ entity/cross-cell retransmission may be designed as follows: H1-H7 respectively indicate 1 st to 8 th HARQ processes, and then the corresponding bit position "0" indicates that this HARQ process does not perform the cross-HARQ entity/cross-cell retransmission, and the corresponding bit position "1" indicates that this HARQ process performs the cross-HARQ entity/cross-cell retransmission.

S703, alternatively, when the UE receives the configuration information of the cross-HARQ entity/cross-Cell retransmission in the step S701, can directly monitor the HARQ process X of the L-Cell to obtain the retransmission on the HARQ process Y of the U-Cell;

s704: the UE receives a PDCCH scheduling signaling or a MAC layer signaling, which is sent by the eNB on the L-Cell, that is, the above-mentioned cross-HARQ entity/cross-Cell retransmission scheduling signaling, where the PDCCH scheduling signaling is taken as an example, and includes the following information:

■, configuring HARQ process number X of L-Cell for U-Cell to replace retransmission in step S701;

and 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 combining mode may be that the UE submits the data received from the HARQ entity of the L-Cell to the HARQ entity corresponding to the U-Cell for HARQ combining; or, when determining that the inter-HARQ entity/inter-Cell retransmission needs to be performed according to step S701, the UE may submit the data of the HARQ entity on the U-Cell to the HARQ entity corresponding to the L-Cell, cache the data in the cache corresponding to the configured L-Cell for replacing the retransmitted HARQ process, and perform HARQ combining with the currently cached data after receiving the retransmitted data on the corresponding HARQ process X.

S705: with respect to step S703, when the eNB contends for a new resource on the U-Cell, the eNB may send the deactivation/cancellation information of the cross-HARQ entity/cross-Cell retransmission, that is, the aforementioned second indication information, to the UE to indicate the UE to stop performing the data processing of the cross-HARQ entity/cross-Cell transmission, and continue to receive data from the HARQ process of the U-Cell.

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

, in the process of data transmission on the U-Cell, if the TAT of the TAG in the U-Cell is timed out, but at this time, if the data on the HARQ process of the U-Cell is being retransmitted by the L-Cell instead, the HARQ entity of the UE should still report the ACK/NACK information on the corresponding HARQ process to the physical layer under the following conditions:

■ U-Cell, but not the TAT of the associated L-Cell, which performs the alternate retransmission.

[ example two ]

In the second embodiment, mutual independence of the HARQ processes of the U-Cell and the L-Cell is maintained, that is, numbers are independently allocated to the HARQ processes of the U-Cell and the L-Cell, that is, the same HARQ process number may occur to the HARQ processes on the HARQ entity of the U-Cell and the HARQ entity corresponding to the L-Cell.

As shown in fig. 8, the second embodiment comprises the following steps:

s801, the UE receives configuration information of cross-HARQ entity/cross-Cell retransmission sent by the eNB, wherein the configuration information comprises or more L-cells for performing cross-HARQ entity/cross-Cell retransmission for the U-cells.

S802: and the eNB carries out resource competition on the unlicensed carrier, and when the resource is competed, the resource is allocated for the UE on the U-Cell for data transmission. Specifically, when the eNB competes for resources on the U-Cell, scheduling information for scheduling the resources on the U-Cell for data transmission for the UE may be sent to the UE through the L-Cell.

S803, when the eNB does not schedule the UE to transmit data on or more HARQ processes of the U-Cell in the U-Cell by using resources, the eNB sends indication/activation information of cross-HARQ entity/cross-Cell retransmission to the UE, and the UE starts to acquire a data packet which replaces the HARQ process of the U-Cell for retransmission from the HARQ process of the L-Cell.

S803', alternatively, when the UE receives the configuration information retransmitted across HARQ entities/cells in step S801, the UE can monitor the L-Cell directly by to obtain the data packet retransmitted in place of the HARQ process of the U-Cell;

s804: the UE receives a PDCCH scheduling signaling sent by the eNB on the L-Cell, wherein the PDCCH scheduling signaling comprises the following information:

■ is indication information of cross HARQ entity/cross cell retransmission;

■ U-Cell identification information;

■ HARQ process number on original U-Cell;

and also optionally contains at least items of information:

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

■ retransmission indication information

Further , for the cross-HARQ entity/cross-Cell alternative retransmitted data packet, the UE combines the corresponding HARQ entities that received the data packet from the HARQ entity of the L-Cell and delivered to the U-Cell.

Specifically, the UE determines retransmission of data on the HARQ process Y of the U-Cell scheduled by the PDCCH scheduling signaling according to the PDCCH scheduling signaling, receives corresponding retransmission data based on the PDCCH scheduling signaling, delivers the received data to the HARQ entity corresponding to the U-Cell, and performs HARQ combination with the data in the cache of the HARQ process Y of the U-Cell.

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 combined with the retransmitted data on the HARQ process Y received from the L-Cell in the L-Cell. Specifically, before combining, the UE needs to first establish a buffer for HARQ process Y in the L-Cell when receiving a retransmission of HARQ process Y scheduled by PDCCH scheduling signaling. Or when the HARQ entity of the L-Cell receives a data packet aiming at the HARQ process Y submitted by the HARQ entity of the U-Cell, firstly establishing a cache aiming at the HARQ process Y in the L-Cell. Optionally, at this time, the buffer of the HARQ process Y in the U-Cell may be emptied, and when a retransmission packet is received from the L-Cell according to the PDCCH scheduling signaling, the buffered data and the received retransmission data are combined.

S805: with respect to step S803, when the eNB contends for a new resource on the U-Cell, the eNB may send deactivation/cancellation information of the cross-HARQ entity/cross-Cell retransmission to the UE to instruct the UE to stop data processing of the cross-HARQ entity transmission to return to continue receiving data from the HARQ process of the U-Cell.

, in the process of performing data transmission on the U-Cell, if the TAT of the TAG in which the U-Cell is located times out, but at this time, if the data on the HARQ process of the U-Cell is being retransmitted instead by the L-Cell, the HARQ entity of the UE should still report ACK/NACK information on the corresponding HARQ process to the physical layer under the following conditions:

■ U-Cell, but the TAT of the TAG of the L-Cell performing the substitute retransmission does not time out.

[ EXAMPLE III ]

In the third embodiment, the U-Cell and the L-Cell share resource pools of HARQ process numbers, that is, the HARQ process numbers of the U-Cell and the L-Cell are numbered by the system , and the same HARQ process number does not occur between the HARQ entity of the U-Cell and the HARQ process on the HARQ entity corresponding to the L-Cell.

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

s901: the UE receives U-Cell configuration information sent by the eNB, wherein the U-Cell configuration information contains HARQ process numbers which can be used by the U-Cell, or a usable HARQ process number range, or a starting HARQ process number which should be used.

Such as: for an LTE FDD system, the value range of HARQ process numbers available for the L-Cell may be: 0-7, the value range of the HARQ process number that can be used by the U-Cell may be: 8-15.

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

S902: and the eNB carries out resource competition on the unlicensed carrier, and when the resource is competed, the resource is allocated for the UE on the U-Cell for data transmission. Specifically, when the eNB competes for resources on the U-Cell, scheduling information for scheduling the resources on the U-Cell for data transmission for the UE may be sent to the UE through the L-Cell.

S903: when the UE is not scheduled by the resource on the U-Cell, the eNB sends indication/activation information of cross-HARQ entity/cross-Cell retransmission to the UE, and the UE starts to acquire a data packet which replaces the HARQ process of the U-Cell for retransmission from the HARQ process of the L-Cell.

Alternatively, when the UE receives the configuration information retransmitted across HARQ entities/cells in step S901, the UE may directly monitor the L-Cell to obtain a data packet retransmitted in place of the U-Cell HARQ process at ;

s904: the UE receives a PDCCH scheduling signaling sent by the eNB on the L-Cell, wherein the PDCCH scheduling signaling comprises the following information:

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

and further optionally comprising:

■ retransmission indication information

, for the cross HARQ entity/cross Cell alternative retransmission data packet, the UE combines the HARQ entities received from the HARQ entity of L-Cell and delivered to the U-Cell, concretely, the UE determines the retransmission of the data scheduled by the PDCCH signaling on the HARQ process Y of U-Cell according to the PDCCH scheduling signaling, then the UE receives the corresponding retransmission data based on the PDCCH scheduling information, delivers the received data to the HARQ entity corresponding to U-Cell and then performs HARQ combination with the data in the buffer of the HARQ process Y of U-Cell, or

The cached data corresponding to the HARQ process Y of the U-Cell can be submitted to the HARQ entity corresponding to the L-Cell, and then the cached data and the retransmitted data on the HARQ process Y received from the L-Cell can be combined in the L-Cell. Specifically, before combining, the UE needs to first establish a buffer for HARQ process Y in the L-Cell upon receiving a retransmission of HARQ process Y scheduled by PDCCH. Or when the HARQ entity of the L-Cell receives a data packet for the HARQ process Y submitted by the HARQ entity from the U-Cell, firstly establishing a cache in the L-Cell for the HARQ process Y, optionally, emptying the cache in the U-Cell for the HARQ process Y at this time, and combining the cached data and the received retransmission data when receiving the retransmission data packet from the L-Cell according to the PDCCH scheduling signaling.

S905: with respect to step S903, when the eNB contends for a new resource on the U-Cell, the eNB may send the deactivation/cancellation information of the cross-HARQ entity/cross-Cell retransmission to the UE to instruct the UE to stop performing the data processing of the cross-HARQ entity/cross-Cell transmission, so as to return to continue receiving data from the HARQ process of the U-Cell.

, in the process of performing data transmission on the U-Cell, if the TAT of the TAG in which the U-Cell is located times out, but if the data on the HARQ process of the U-Cell is being retransmitted instead by the L-Cell, the HARQ entity of the UE should still report ACK/NACK information on the corresponding HARQ process to the physical layer under the following conditions:

[ EXAMPLE IV ]

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, and the cross-HARQ entity/cross-Cell transmission configuration information indicates the UE to: new data is received from the L-Cell upon determining that U-Cell resources are scarce or no resources are available.

This step is optional, alternatively, new data may be received from the L-Cell when U-Cell resources are scarce or available with no resources at the UE side default settings. Here, the U-Cell resource shortage may mean that a certain process of the U-Cell lacks a resource, or that all processes of the U-Cell lack a resource.

S1002: and the eNB executes resource competition on the unlicensed carrier, and allocates resources for the UE on the U-Cell for data transmission when the resources are competed. Specifically, when the eNB competes for resources on the U-Cell, scheduling information for scheduling the resources on the U-Cell for data transmission for the UE may be sent to the UE through the L-Cell.

S1003, when the eNB cannot compete for the resource in the U-Cell or the resource which is contended before is about to be exhausted, the eNB sends a U-Cell resource state indication message, namely the th resource state indication message, to the UE, wherein the message contains indication information for indicating that the U-Cell is lack of the resource or has no resource.

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: and (4) PDCCH signaling.

And after receiving the U-Cell resource state indication message, the UE determines that a new data packet needs to be continuously received from the L-Cell, and then clears the cache corresponding to the HARQ process of the current U-Cell. Or after receiving the U-Cell resource status indication message, the UE first starts a timer T1, and before the timer T1 is terminated, if there is no resource on the U-Cell, after the timer T1 times out, the UE clears the buffer corresponding to the HARQ process of the current U-Cell.

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

Alternatively, the U-Cell resource status indication message may indicate: when the eNB competes for the resources on the U-Cell, the effective time length of the resources, and then when the UE determines that no effective resources exist on the current U-Cell according to the effective time length, the UE determines that a new data packet needs to be continuously received from the L-Cell, and then clears the cache corresponding to the HARQ process of the current U-Cell. Or, the UE starts a timer T2 when determining that no effective resource exists on the current U-Cell, and before the timer T2 is terminated, if no resource still exists on the U-Cell, the UE clears the cache corresponding to the HARQ process of the current U-Cell after the timer T2 is overtime.

S1004, when no resource is available on the U-Cell, the eNB uses the resource on the L-Cell to send UE. the data which needs to be sent on the U-Cell originally to the data which needs to be sent on the U-Cell on the L-Cell, wherein the data which has been transmitted initially or transmitted times repeatedly and still has not been sent to the UE successfully on the U-Cell and the data which has not been transmitted on the U-Cell.

S1005: and the eNB continues to compete for resources on the unlicensed carrier, and when the eNB competes for new resources, the eNB sends a U-Cell resource status indication message, namely the aforementioned second resource status indication message, to the UE so as to indicate the time length of the available resources on the new U-Cell.

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

After the UE receives the U-Cell resource state indication message, the time length of the available resource is determined, and when the determined time length of the available resource is larger than the fixed time limit of , the UE determines to start monitoring the scheduling information of the U-Cell and receives data from the U-Cell, or

And after receiving the U-Cell resource state indication message, the UE starts a timer T3, and after the timer T3 is overtime, if resources are still available on the U-Cell, the UE starts to monitor the scheduling information of the U-Cell and receives data from the U-Cell.

[ EXAMPLE V ]

As shown in fig. 11, the fifth embodiment includes the following steps:

s1101, the UE receives configuration information of cross-HARQ entity/cross-Cell retransmission sent by the eNB, wherein the configuration information comprises or more L-cells information for performing cross-HARQ entity/cross-Cell retransmission for the U-Cell.

Further , the configuration information may indicate that the UE receives initial transmissions of data only on the HARQ processes of the U-cells, while receiving retransmissions corresponding to the HARQ processes from the L-cells.

Alternatively, in addition to using the configuration information in step S1101, the relationship between the L-Cell and the U-Cell may be agreed upon by rules , for example, a primary Cell (PCell) may be selected as a substitute transmission Cell for the U-Cell without configuration by the configuration information agent .

Further , the UE may also be agreed to receive initial transmissions of data only on the HARQ process of the U-Cell and to receive retransmissions corresponding to that HARQ process from the L-Cell.

S1102: and the eNB executes resource competition on the unlicensed carrier, and allocates resources for the UE on the U-Cell for data transmission when the resources are competed.

Specifically, when the eNB competes for resources on the U-Cell, scheduling information for scheduling the resources on the U-Cell for data transmission for the UE may be sent to the UE through the L-Cell.

S1103: the UE monitors PDCCH scheduling signaling sent by the eNB, receives corresponding scheduling information so as to receive initial transmission of a corresponding data packet from HARQ process Y of the U-Cell, and then receives retransmission of the data packet aiming at the HARQ process Y from the L-Cell.

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 contains the information, if the value of the NDI indicates initial transmission, the UE determines that the PDCCH scheduling signaling is cross-carrier scheduling signaling, and the UE receives a newly transmitted data packet of an HARQ process Y from the U-Cell;

when the PDCCH scheduling signaling received by the UE from the eNB contains the information, if the NDI value indicates retransmission, the UE determines that the PDCCH scheduling signaling is cross-HARQ entity retransmission/cross-Cell retransmission scheduling signaling, and then the UE receives a retransmitted data packet of the HARQ process Y from the L-Cell.

step, for the cross HARQ entity/cross Cell alternative retransmission data packet, UE submits the data packet received from the HARQ entity of L-Cell to the HARQ entity corresponding to U-Cell for merging, concretely, UE determines the retransmission of the data scheduled by the PDCCH scheduling signaling on the HARQ process Y of U-Cell according to the PDCCH scheduling signaling, then UE receives the corresponding retransmission data based on the scheduling information in the PDCCH scheduling information, submits the received data to the HARQ entity corresponding to U-Cell and then performs HARQ merging with the data in the buffer of the HARQ process Y of U-Cell, or

The UE can also submit the cached data corresponding to the HARQ process Y of the U-Cell to the HARQ entity corresponding to the L-Cell and then combine the cached data with the retransmitted data on the HARQ process Y received from the L-Cell in the L-Cell.

Specifically, before combining, the UE needs to first establish a buffer for HARQ process Y on the L-Cell when receiving the PDCCH scheduling signaling and scheduling retransmission of HARQ process Y. Or when the HARQ entity of the L-Cell receives a data packet for the HARQ process Y submitted by the HARQ entity from the U-Cell, firstly establishing a cache for the HARQ process Y in the L-Cell, optionally, at this time, emptying the cache of the HARQ process Y on the U-Cell, and when receiving a retransmission data packet from the L-Cell according to the PDCCH scheduling signaling, combining the cached data with the received retransmission data.

, in the process of performing data transmission on the U-Cell, if the TAT of the TAG in which the U-Cell is located times out, but if the data on the HARQ process of the U-Cell is being retransmitted instead by the L-Cell, the HARQ entity of the UE should still report the ACK/NACK information on the corresponding HARQ process to the physical layer under the following conditions:

The wireless communication system provided by the embodiment of the present invention is introduced above, and is illustrated by the 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.

Fig. 12 is a schematic structural diagram of an th network device according to an embodiment of the present invention, as shown in fig. 12, the network device includes:

a transceiver module 1201, configured to perform initial transmission of downlink data to a user equipment UE through a hybrid automatic repeat request HARQ process Y of an unlicensed Cell U-Cell;

a processing module 1202, configured to determine that a retransmission mode of the downlink data is retransmission through an authorized Cell L-Cell;

the transceiver module 1201 is further configured to: and retransmitting the downlink data to the UE through the L-Cell.

Optionally, the transceiver module 1201 is further configured to:

and sending cross-HARQ entity/cross-Cell transmission configuration information to the UE before retransmitting the downlink data to the UE through the L-Cell, wherein the cross-HARQ entity/cross-Cell transmission configuration information is used for indicating that the retransmission mode of the downlink data of the UE is retransmission through the L-Cell.

Optionally, a retransmission mode of the downlink data retransmitted through the L-Cell is preset.

Optionally, a retransmission mode of the downlink data retransmitted through the L-Cell is preset, and the L-Cell is a primary Cell PCell in communication with the UE.

Optionally, the transceiver module 1201 is further configured to:

after the initial transmission of downlink data is carried out on the UE through the HARQ process Y of the U-Cell, sending a cross-HARQ entity/cross-Cell retransmission scheduling signaling to the UE through the L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling is used for indicating the UE to receive the retransmission of the downlink data from the L-Cell;

the transceiver module 1201 is specifically configured to:

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

indication information of retransmission;

identification of U-Cell; and

identification of HARQ process Y.

Optionally, the transceiver module 1201 is further configured to:

before the initial transmission of downlink data is carried out on the UE through the HARQ process Y of the U-Cell, a cross-carrier scheduling signaling is sent to the UE through the U-Cell, and the cross-carrier scheduling signaling is used for indicating the UE to receive the initial transmission of the downlink data from the HARQ process Y on the U-Cell;

the transceiver module 1201 is specifically configured to: and 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:

indication information of initial transmission;

identification of U-Cell; and

identification of HARQ process Y.

Optionally, the transceiver module 1201 is further configured to: after the transceiving module 1201 retransmits the downlink data to the UE through the L-Cell,

before a timing synchronization timer TAT of a time advance group TAG where the U-Cell is located is overtime, feedback information which is sent by UE and aims at retransmission of the downlink data is not received; and

and after determining that the TAT of the timing synchronization timer of the time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, waiting for receiving feedback information which is sent by the UE and aims at retransmission of the downlink data.

For other optional implementation details of the network device, reference may be made to the network device 201 described above, and repeated details are not repeated.

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:

a transceiver 1301, configured to perform initial transmission of downlink data to a user equipment UE through a hybrid automatic repeat request HARQ process Y of an unlicensed Cell U-Cell;

a processor 1302, configured to determine that a retransmission mode of the downlink data is retransmission through an authorized Cell L-Cell;

the transceiver 1301 is also used to: and retransmitting the downlink data to the UE through the L-Cell.

For other optional implementations of the transceiver 1301, reference may be made to the transceiver module 1201, and for other optional implementations of the processor 1302, reference may be made to the processing module 1202, and for other optional implementation details of the network device, reference may be made to the foregoing network device 201, and repeated details are not repeated.

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:

a transceiver module 1401, configured to transmit downlink data to a user equipment UE through a hybrid automatic repeat request HARQ process Y of an unlicensed Cell U-Cell;

a processing module 1402, configured to determine that there is no or lack of available downlink resource on the U-Cell for scheduling the UE to transmit the downlink data, and determine to retransmit the downlink data to the UE through the L-Cell;

the transceiver module 1401 is further configured to: and transmitting the downlink data to the UE again through the L-Cell.

Optionally, the processing module 1402 is specifically configured to: determining to perform initial transmission and retransmission of the downlink data to the UE through the L-Cell

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

Optionally, the transceiver module 1401 is specifically configured to:

Optionally, the transceiving module 1401 is further configured to: before the initial transmission and retransmission of the downlink data are performed to the UE through the L-Cell,

transmitting cross-HARQ entity/cross-cell transmission configuration information to the UE, wherein the cross-HARQ entity/cross-cell transmission configuration information is used for indicating the UE to: and when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists in the U-Cell, the L-Cell replaces the U-Cell to perform initial transmission and 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, a transmission mode of the L-Cell instead of the U-Cell for initial transmission and retransmission of the downlink data 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, a transmission mode for the L-Cell to perform initial transmission and retransmission of the downlink data instead of the U-Cell is preset, and the L-Cell is a primary Cell PCell in communication with the UE.

Optionally, the transceiving module 1401 is further configured to: after the processing module 1402 determines that the initial transmission and retransmission of the downlink data are performed to the UE through the L-Cell, the transceiver module 1401 performs the initial transmission and retransmission of the downlink data to the UE through the L-Cell,

when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, th resource status indication message is sent to the UE, and th resource status indication message is used for indicating the UE to:

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

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

Optionally, the transceiving module 1401 is further configured to:

when available downlink resources used for scheduling the UE to transmit the downlink data exist on the U-Cell, a second resource state indication message is sent to the UE, and the second resource state indication message is used for indicating the UE to:

And within the second effective time length, available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell.

Optionally, the transceiver module 1401, when retransmitting the downlink data to the UE through the L-Cell, is specifically configured to:

and retransmitting the downlink data to the UE through the L-Cell.

Optionally, the transceiver module 1401 is specifically configured to:

Optionally, the transceiving module 1401 is further configured to: before the retransmission of the downlink data is performed to the UE through HARQ process X of the L-Cell,

sending configuration information of cross-HARQ entity/cross-cell retransmission to the UE, wherein the configuration information of cross-HARQ entity/cross-cell retransmission is used for indicating the UE to: and when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists in the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

Optionally, when there is no or lack of available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, a transmission mode is preset in which the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

Optionally, when there is no or lack of available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, a transmission mode in which the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data is preset; the L-Cell is a primary Cell PCell which communicates with the UE.

Optionally, the transceiving module 1401 is further configured to: after downlink data transmission is performed to the UE through HARQ process Y of the U-Cell,

sending a cross HARQ entity/cross Cell retransmission scheduling signaling to the UE through the L-Cell, wherein the cross HARQ entity/cross Cell retransmission scheduling signaling comprises the following steps:

the identifier of the HARQ process X is used for indicating a transmission mode that the UE replaces the HARQ process Y of the U-Cell to retransmit the downlink data according to the HARQ process X of the L-Cell, and combining the retransmitted data of the downlink data scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling with the downlink data on the HARQ process Y of the U-Cell;

the transceiver module 1401 is specifically configured to: and retransmitting the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

Optionally, the transceiving module 1401 is further configured to: before retransmission of the downlink data to the UE via the L-Cell,

sending configuration information of cross-HARQ entity/cross-cell retransmission to the UE, wherein the configuration information of cross-HARQ entity/cross-cell retransmission is used for indicating the UE to: and the L-Cell replaces the U-Cell to retransmit the downlink data.

Optionally, when there is no or lack of available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, a transmission mode for the L-Cell to perform retransmission of the downlink data instead of the U-Cell is preset.

Optionally, when there is no or lack of available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, a transmission mode for the L-Cell to perform retransmission of the downlink data instead of the U-Cell is preset; the L-Cell is a primary Cell PCell which communicates with the UE.

Optionally, the transceiving module 1401 is further configured to: after the transmission of downlink data to the UE is carried out through the HARQ process Y of the U-Cell:

transmitting a cross HARQ entity/cross Cell retransmission scheduling signaling to the UE through the L-Cell, wherein the cross HARQ entity/cross Cell retransmission scheduling signaling is used for indicating the UE to receive retransmission of the downlink data from the L-Cell;

the indication information of the cross-HARQ entity/cross-cell retransmission is used for indicating that: the cross-HARQ entity/cross-cell retransmission scheduling signaling is used for scheduling the UE to receive retransmission of the downlink data on the cell which uses the unlicensed frequency spectrum and communicates with the UE from the cell which uses the licensed frequency spectrum and communicates with the UE;

identification of U-Cell;

identification of HARQ process Y.

Optionally, the identification of the HARQ process of the L-Cell and the identification of the HARQ process of the U-Cell are independently allocated.

Alternatively,

the transceiver module 1401 is further configured to: before retransmission of the downlink data to the UE via the L-Cell,

and sending U-Cell configuration information to the UE, wherein the U-Cell configuration information comprises:

HARQ process identification which can be used by the UE on the U-Cell; or

transmitting, to the UE, a cross-HARQ entity/cross-Cell retransmission scheduling signaling through the L-Cell,

identification of HARQ process Y;

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

Optionally, the transceiving module 1401 is further configured to:

when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, th indication information is sent to the UE, and th indication information is used for indicating the UE to:

the UE needs to receive the retransmission of the downlink data of the HARQ process Y of the U-Cell from a Cell which is communicated with the UE and uses the authorized frequency spectrum; or

The UE needs to receive the retransmission of the downlink data of all HARQ processes on the U-Cell from a Cell which is communicated with the UE and uses the authorized frequency spectrum; or

The UE needs to receive a retransmission of this downlink data for a designated HARQ process on the U-Cell from a Cell using the licensed spectrum that is in communication with the UE.

Optionally, the transceiving module 1401 is further configured to transmit th indication information to the UE, wherein the th indication information is used for indicating the UE to:

when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists in the U-Cell, the UE needs to receive retransmission of the downlink data of the HARQ process Y of the U-Cell from a Cell which is communicated with the UE and uses a licensed frequency spectrum; or

When there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the UE needs to receive retransmission of the downlink data of all HARQ processes on the U-Cell from a Cell which uses a licensed spectrum and is in communication with the UE; or

When there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, the UE needs to receive a retransmission of the downlink data of a designated HARQ process on the U-Cell from a Cell using a licensed spectrum, which is in communication with the UE.

Alternatively, if the th indication information is used to indicate to the UE that the UE needs to receive a retransmission of the downlink data of a designated HARQ process on the U-Cell from a Cell using a licensed spectrum in communication with the UE, then the UE transmits the retransmission to the UE via the U-Cell via the UE's dedicated HARQ process on the U-Cell via the UE's dedicated physical downlink

The th indication information includes identification information specifying the HARQ process.

Optionally, the transceiving module 1401 is further configured to:

when available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell, second indication information is sent to the UE, and the second indication information is used for indicating the UE to: receiving the downlink data of the HARQ process Y from the U-Cell; or

Sending second indication information to the UE, wherein the second indication information is used for indicating the UE to: and when available downlink resources for scheduling the UE to transmit the downlink data exist on the U-Cell, receiving the downlink data of the HARQ process Y from the U-Cell.

Optionally, the transceiving module 1401 is further configured to: after retransmission of the downlink data to the UE through the L-Cell,

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:

a transceiver 1501, configured to transmit downlink data to a user equipment UE through a hybrid automatic repeat request HARQ process Y of an unlicensed Cell U-Cell;

the processor 1502 is configured to determine that no or no available downlink resource for scheduling the UE to transmit the downlink data exists in the U-Cell, and determine to retransmit the downlink data to the UE through the L-Cell;

the transceiver 1501 is also used to: and transmitting the downlink data to the UE again through the L-Cell.

Other optional implementations of the transceiver 1501 may refer to the transceiver module 1401, and other possible implementations of the processor 1502 may refer to the processing module 1402, and details of other optional implementations of the network device may refer to the foregoing network device 201, and repeated details are not repeated.

Fig. 16 is a schematic structural diagram of an th user equipment according to an embodiment of the present invention, as shown in fig. 16, the user equipment includes:

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

a processing module 1602, configured to determine that the retransmission mode of the downlink data is retransmission through an authorized Cell L-Cell;

the transceiver module 1601 is further configured to: and receiving the retransmission of the downlink data by the network equipment through the L-Cell.

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

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, it is determined that the retransmission mode of the downlink data is retransmission through the L-Cell.

Optionally, the transceiver module 1601 is further configured to: after receiving initial transmission of downlink data sent by network equipment through an HARQ process Y of a U-Cell, receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network equipment through an L-Cell;

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

the transceiver module 1601 is specifically configured to: and receiving the retransmission of the downlink data on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

indication information of retransmission;

identification of U-Cell; and

identification of HARQ process Y.

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

the processing module 1602 is further configured to: determining to receive the initial transmission of the downlink data from the HARQ process Y on the U-Cell according to the received cross-carrier scheduling signaling;

the transceiver module 1601 is specifically configured to: and 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:

indication information of initial transmission;

identification of U-Cell; and

identification of HARQ process Y.

Optionally, the processing module 1602 is further configured to: after the transceiver module 1601 receives retransmission of the downlink data by the network device through the L-Cell, it determines whether a TAT of a timing synchronization timer of a time advance group TAG in which the U-Cell is located is overtime, and whether a TAT of a TAG in which the L-Cell is located is overtime;

the transceiver module 1601 is further configured to: after the processing module 1602 determines that the TAT of the timing synchronization timer of the time advance group TAG in which the U-Cell is located is overtime, if the processing module 1602 determines that the TAT of the TAG in which the L-Cell is located is not overtime, the processing module sends feedback information for retransmission of the downlink data 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 data in the buffer of the HARQ process Y of the U-Cell; or

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

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

when the transceiver module 1601 receives a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by a network device through an L-Cell, establishing an th cache of an HARQ process Y of the L-Cell for a U-Cell, or a th cache of an HARQ process corresponding to the L-Cell for transmitting retransmission of the downlink data;

after the transceiver module 1601 receives the retransmitted data of the downlink data, the transceiver module 1601 buffers the retransmitted data received by the transceiver module 1601 into the established th buffer;

the processing module 1602 is specifically configured to combine the data in the buffer of HARQ process Y of U-Cell of the UE with the retransmitted data buffered in the th buffer.

when the HARQ entity corresponding to the L-Cell receives the downlink data of the HARQ process Y of the U-Cell, establishing th cache of the L-Cell for the HARQ process Y or th cache of the HARQ process corresponding to the L-Cell and used for transmitting retransmission of the downlink data, and caching the data of the HARQ process Y of the U-Cell received by the transceiver module 1601 into a th cache;

the processing module 1602 is specifically configured to, when the transceiver module 1601 receives retransmission data of retransmission of HARQ process Y sent by the network device through the L-Cell, combine the data of HARQ process Y of the U-Cell received and buffered in the th buffer with the received retransmission data of retransmission.

Optionally, the processing module 1602 is further configured to:

after combining the data in the buffer of HARQ process Y of the U-Cell of the UE with the retransmitted data of the downlink data received by the transceiver module 1601, the data in the buffer of 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 user equipment 202 described above, and repeated details are not repeated.

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:

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

a processor 1702, configured to determine that the retransmission mode of the downlink data is retransmission through an authorized Cell L-Cell;

the transceiver 1701 is also used to: and receiving the retransmission of the downlink data by the network equipment through the L-Cell.

For other optional implementations of the transceiver 1701, reference may be made to the transceiver module 1601, for other optional implementations of the processor 1702, reference may be made to the processing module 1602, and for other optional implementation details of the UE, reference may be made to the foregoing user equipment 202, and repeated details are not repeated.

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:

a transceiving module 1801, configured to receive transmission of downlink data by a network device through a hybrid automatic repeat request HARQ process Y of an unlicensed Cell U-Cell;

a processing module 1802, determining that there is no or lack of available downlink resource for scheduling the current user equipment UE to transmit the downlink data on the U-Cell, and determining that the network device receives the downlink data transmission performed again through the L-Cell of the authorized Cell;

the transceiving module 1801 is further configured to: and receiving the downlink data transmission which is carried out again by the network equipment through the L-Cell.

Optionally, the processing module 1802 is specifically configured to: determining initial transmission and retransmission of the downlink data by receiving the network equipment through the L-Cell;

the transceiver module 1801 is specifically configured to: and receiving the initial transmission and retransmission of the downlink data by the network equipment through the L-Cell.

Optionally, the transceiver module 1801 is specifically configured to:

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

Optionally, the transceiver module 1801 is further configured to: receiving cross-HARQ entity/cross-Cell transmission configuration information sent by network equipment before receiving initial transmission and retransmission of the downlink data performed by the network equipment through an HARQ process Y of the U-Cell;

the processing module 1802 is further configured to: and according to the cross-HARQ entity/cross-Cell transmission configuration information, when determining that no or lack of available downlink resources for scheduling UE to transmit the downlink data exists on the U-Cell, the L-Cell replaces the U-Cell to perform initial transmission and 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, a transmission mode for the L-Cell to perform initial transmission and retransmission of the downlink data instead of the U-Cell is preset, and the L-Cell is a primary Cell PCell in communication with the current UE.

Optionally, the transceiver module 1801 is further configured to: after the processing module 1802 determines the initial transmission and retransmission of the downlink data by the L-Cell receiving network device, the transceiving module 1801 receives the initial transmission and retransmission of the downlink data by the network device through the L-Cell,

th resource status indication message sent by the network equipment is received, th resource status indication message is used for indicating the UE that no available downlink resource for scheduling the UE to transmit the downlink data exists or lacks on the U-Cell;

the processing module 1802 is further configured to:

after the transceiving module 1801 receives the resource status indication message, it determines that the initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum for communicating with the UE, or

After the transceiving module 1801 receives the th resource status indication message, a th timer is started, and before the th timer expires, if there is no downlink resource available on the U-Cell or there is a lack of available downlink resource for scheduling the UE to transmit the downlink data, it is determined that initial transmission and retransmission of the downlink data need to be received from a Cell using a licensed spectrum, which is in communication with the UE.

Optionally, the transceiving module 1801 is further configured to receive an th resource status indication message sent by the network device, where the th resource status indication message is used to indicate that, after the th active 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 processing module 1802 is further configured to:

determining whether to receive initial transmission and retransmission of the downlink data from the cell using the licensed spectrum in communication with the UE after determining that the -th valid time period after the transceiving module 1801 receives the -th resource status indication message is long, or

After the valid time period after the transceiver module 1801 receives the th resource status indication message, a th timer is started, and before the th timer expires, if there is no downlink resource available on the U-Cell or there is no downlink resource available on the U-Cell for scheduling the UE to transmit the downlink data, it is determined that initial transmission and retransmission of the downlink data need to be received from a Cell using a licensed spectrum, which is in communication with the UE.

Optionally, the processing module 1802 is further configured to: after determining that initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum in communication with the UE,

and emptying the buffer of the HARQ process Y on the U-Cell.

Optionally, the transceiver module 1801 is further configured to:

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 a second timer, and after the second timer expires, if there is still available downlink resource for scheduling the UE to transmit the downlink data on the U-Cell, it determines that the downlink data needs to be received from the U-Cell.

Optionally, the transceiver module 1801 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: available downlink resources used for scheduling the current UE to transmit the downlink data exist on the U-Cell within the second effective time length;

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:

and receiving the retransmission of the downlink data by the network equipment through the L-Cell.

Optionally, the transceiver module 1801 is specifically configured to:

and receiving the retransmission of the downlink data by the network equipment through the HARQ process X of the L-Cell.

Optionally, the transceiver module 1801 is further configured to: before receiving the retransmission of the downlink data, which is performed by the network equipment through the HARQ process X of the L-Cell, receiving the configuration information of the cross-HARQ entity/cross-Cell retransmission sent by the network equipment;

the processing module 1802 is further configured to: and when determining that no or no available downlink resource for scheduling UE to transmit the downlink data exists on the U-Cell or lack of available downlink resource for transmitting the downlink data according to the configuration information of the cross-HARQ entity/cross-Cell retransmission, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

Optionally, when there is no or lack of available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, a transmission mode is preset in which the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

Optionally, when there is no available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell or there is no available downlink resource for scheduling the current UE to transmit the downlink data, a transmission mode in which the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data is preset; the L-Cell is a primary Cell PCell which communicates with the current UE.

Optionally, the transceiver module 1801 is further configured to: after receiving the transmission of downlink data by the network device through HARQ process Y of the U-Cell,

receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by a network device through an L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling comprises: identification of HARQ process X;

the transceiver module 1801 is specifically configured to: and receiving the retransmission of the downlink data on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

Optionally, the transceiver module 1801 is further configured to: receiving configuration information which is sent by network equipment and used for sending cross HARQ entity/cross cell retransmission;

the processing module 1802 is further configured to: and according to the configuration information of the cross-HARQ entity/cross-Cell retransmission, when determining that no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, the L-Cell replaces the U-Cell to retransmit the downlink data.

Optionally, the transceiver module 1801 is further configured to: after receiving the transmission of downlink data by the network equipment through the HARQ process Y of the U-Cell, receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network equipment through the L-Cell;

the indication information of the cross-HARQ entity/cross-cell retransmission is used for indicating that: the cross-HARQ entity/cross-cell retransmission scheduling signaling is used for scheduling the current UE to receive the retransmission of downlink data on the cell which uses the unlicensed spectrum and is communicated with the current UE from the cell which uses the licensed spectrum and is communicated with the current UE;

identification of U-Cell;

identification of HARQ process Y.

Optionally, the transceiver module 1801 is further configured to: prior to receiving a retransmission of this downlink data by the network device over the L-Cell,

receiving U-Cell configuration information sent by network equipment, wherein the U-Cell configuration information comprises:

HARQ process identification which can be used by the UE on the U-Cell; or

Optionally, the transceiver module 1801 is further configured to: after receiving downlink data transmission performed by a network device through an HARQ process Y of a U-Cell, receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through an L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling comprises: identification of HARQ process Y;

the processing module 1802 is further configured to: determining a cross-HARQ entity/cross-Cell retransmission scheduling signaling for scheduling the UE to receive the retransmission of the downlink data from the L-Cell according to the received U-Cell configuration information;

Optionally, the transceiving module 1801 is further configured to receive indicating information sent by the network device when there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, wherein the indicating information is used to indicate the UE that there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data;

the processing module 1802 is further configured to, after the transceiver module 1801 receives the -th indication information, determine:

the retransmission of the downlink data of the HARQ process Y of the U-Cell needs to be received from the Cell which uses the authorized spectrum and is communicated with the current UE; or need to receive retransmissions of all HARQ processes on the U-Cell from a Cell using the licensed spectrum communicating with the current UE; or a retransmission of the designated HARQ process on the U-Cell needs to be received from the Cell using the licensed spectrum communicating with the current UE.

Optionally, the transceiving module 1801 is further configured to receive th indication information sent by the network device;

the processing module 1802 is further configured to determine from the th indicating information:

when no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists in the U-Cell, receiving retransmission of the downlink data of the HARQ process Y of the U-Cell from a Cell which is communicated with the current UE and uses the authorized frequency spectrum; or

When no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists on the U-Cell, receiving retransmission of the downlink data of all HARQ processes on the U-Cell from a Cell which is communicated with the current UE and uses a licensed spectrum; or

When there is no or lack of available downlink resources on the U-Cell for scheduling the current UE to transmit the downlink data, the downlink data retransmission of the designated HARQ process on the U-Cell needs to be received from the Cell which uses the authorized spectrum and is communicated with the current UE.

Alternatively, if the processing module 1802 determines that a retransmission of the downlink data for a designated HARQ process on the U-Cell needs to be received from a Cell using a licensed spectrum in communication with the current UE, then the processing module 1802 determines that a retransmission of the downlink data for the designated HARQ process on the U-Cell is needed

Optionally, the transceiver module 1801 is further configured to receive second indication information sent by the network device, where the second indication information is used to indicate: available downlink resources for scheduling the current UE to transmit the downlink data exist on the U-Cell; after receiving the second indication information, receiving the downlink data of the HARQ process Y from the U-Cell; or

The transceiving module 1801 is further configured to receive second indication information sent by the network device, and receive the downlink data of the HARQ process Y from the U-Cell when the processing module 1802 determines, according to the second indication information, that there is available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell.

Optionally, the transceiver module 1801 is further configured to: after receiving the downlink data transmission which is carried out again by the network equipment through the L-Cell, after a timing synchronization timer TAT of a time advance group TAG where the U-Cell is located is overtime, if the TAT of the TAG where the L-Cell is located is not overtime, sending feedback information aiming at retransmission of the downlink data of the HARQ process Y to the network equipment.

Optionally, the processing module 1802 is further configured to:

the retransmission data of the downlink data received by the transceiving module 1801 is sent to the HARQ entity corresponding to the U-Cell of the UE, and is combined with the data in the cache of the HARQ process Y of the U-Cell; or

The data in the buffer of HARQ process Y of U-Cell of UE is combined with the retransmitted data of the downlink data received by the transceiver module 1801.

Optionally, the processing module 1802 is further configured to: before the data in the cache of the HARQ process Y of the U-Cell of the UE is sent to the HARQ entity corresponding to the L-Cell of the UE and the received data of the retransmission of the downlink data are combined,

when the transceiving module 1801 receives a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by a network device through an L-Cell, it establishes an th cache of an HARQ process Y of the L-Cell for a U-Cell, or a th cache of an HARQ process corresponding to the L-Cell for transmitting retransmission of the downlink data;

after the transceiver module 1801 receives the retransmitted data of the downlink data, the received retransmitted data is cached in the established th cache;

the processing module 1802 is specifically configured to combine the data in the buffer of HARQ process Y of the U-Cell of the UE with the retransmitted data buffered in the th buffer.

Optionally, the processing module 1802 is further configured to, before combining with the retransmitted data of the downlink data received by the transceiving module 1801, when an HARQ entity corresponding to an L-Cell receives the downlink data of an HARQ process Y of a U-Cell, establish an th cache of the L-Cell for the HARQ process Y, or a th cache of the HARQ process corresponding to the L-Cell for transmitting retransmission of the downlink data, and cache the received data of the HARQ process Y of the U-Cell in a th cache;

the processing module 1802 is specifically configured to, when the transceiver module 1801 receives retransmission data of retransmission of HARQ process Y sent by the network device through the L-Cell, combine the data of HARQ process Y of the U-Cell received and buffered in the th buffer with the received retransmission data of retransmission.

Optionally, the processing module 1802 is further configured to:

after combining the data in the buffer of HARQ process Y of the U-Cell of the UE with the retransmitted data of the downlink data received by the transceiver module 1801, the data in the buffer of HARQ process Y corresponding to the U-Cell of the current UE is emptied.

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:

a transceiver 1901, configured to receive downlink data transmission performed by a network device through a hybrid automatic repeat request HARQ process Y of an unlicensed Cell U-Cell;

a processor 1902, configured to determine that there is no or lack of available downlink resource on the U-Cell for scheduling the current UE to transmit the downlink data, and determine to receive, via the L-Cell of the authorized Cell, a retransmission of the downlink data by the network device;

the transceiver 1901 is also used to: and receiving the downlink data transmission which is carried out again by the network equipment through the L-Cell.

For other optional implementations of the transceiver 1901, reference may be made to the transceiver module 1801, for other optional implementations of the processor 1902, reference may be made to the processor 1802, and for other optional implementation details of the UE, reference may be made to the foregoing user equipment 202, and repeated details are not repeated.

Fig. 20 is a flowchart of an th downlink data transmission method according to an embodiment of the present invention, as shown in fig. 20, the method includes the following steps:

s2001: performing initial transmission of downlink data to User Equipment (UE) through a hybrid automatic repeat request (HARQ) process Y of an unlicensed Cell U-Cell;

s2002: determining that the retransmission mode of the downlink data is retransmission through an L-Cell of an authorized Cell; and the downlink data is retransmitted to the UE through the L-Cell.

Optionally, before retransmitting the downlink data to the UE through the L-Cell, the method further includes:

and sending cross-HARQ entity/cross-Cell transmission configuration information to the UE, wherein the cross-HARQ entity/cross-Cell transmission configuration information is used for indicating that the retransmission mode of the downlink data of the UE is retransmission through the L-Cell.

Optionally, after performing initial transmission of downlink data to the UE through HARQ process Y of the U-Cell, the method further includes:

retransmitting the downlink data to the UE via the L-Cell, including:

indication information of retransmission;

identification of U-Cell; and

identification of HARQ process Y.

Optionally, before performing initial transmission of downlink data to the UE through HARQ process Y of the U-Cell, the method further includes:

sending a cross-carrier scheduling signaling to the UE through the U-Cell, wherein the cross-carrier scheduling signaling is used for indicating the UE to receive the initial transmission of the downlink data from an HARQ process Y on the U-Cell;

the method for carrying out initial transmission of downlink data to the UE through the HARQ process Y of the U-Cell comprises the following steps: and 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:

indication information of initial transmission;

identification of U-Cell; and

identification of HARQ process Y.

Optionally, after the retransmission of the downlink data is performed to the UE through the L-Cell, the method further includes:

For other optional implementation details of the method, reference may be made to the implementation of the network device 201, and repeated details are not described here.

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 steps of:

s2101: transmitting downlink data to User Equipment (UE) through a hybrid automatic repeat request (HARQ) process Y of an unlicensed Cell U-Cell;

s2102: determining that no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell, and determining that the downlink data is transmitted to the UE again through an authorized Cell L-Cell;

s2103: and transmitting the downlink data to the UE again through the L-Cell.

Optionally, determining to retransmit the downlink data to the UE through the L-Cell includes: determining that the initial transmission and retransmission of the downlink data are performed to the UE through the L-Cell;

the retransmission of the downlink data to the UE through the L-Cell includes:

Optionally, the transmitting downlink data to the UE through HARQ process Y of the U-Cell includes:

Optionally, before performing initial transmission and retransmission of the downlink data to the UE through the L-Cell, the method further includes:

Optionally, after determining that the initial transmission and retransmission of the downlink data are performed to the UE through the L-Cell, and before performing the initial transmission and retransmission of the downlink data to the UE through the L-Cell, the method further includes:

Optionally, the method further comprises:

Optionally, the retransmitting, to the UE, the downlink data through the L-Cell includes:

and retransmitting the downlink data to the UE through the L-Cell.

Optionally, before performing retransmission of the downlink data to the UE through HARQ process X of the L-Cell, the method further includes:

Optionally, after the transmission of downlink data to the UE through HARQ process Y of the U-Cell, the method further includes:

and retransmitting the downlink data to the UE through an HARQ process X of the L-Cell, wherein the retransmission comprises the following steps: and retransmitting the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

sending configuration information of cross-HARQ entity/cross-cell retransmission to the UE, wherein the configuration information of cross-HARQ entity/cross-cell retransmission is used for indicating the UE to: and when no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists in the U-Cell, the L-Cell replaces the U-Cell to retransmit the downlink data.

retransmitting the downlink data to the UE via the L-Cell, including: and retransmitting the downlink data to the UE on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

identification of U-Cell;

identification of HARQ process Y.

HARQ process identification which can be used by the UE on the U-Cell; or

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

the identification of the HARQ process Y indicates that the UE determines a cross-HARQ entity/cross-Cell retransmission scheduling signaling for scheduling the UE to receive the retransmission of the downlink data from the L-Cell according to the received U-Cell configuration information;

and retransmitting the downlink data to the UE through the L-Cell, wherein the retransmission of the downlink data is performed to the UE on downlink resources on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

Optionally, the method further comprises:

Optionally, the method further comprises sending th indication information to the UE, wherein the th indication information is used for indicating the UE to:

Optionally, the method further comprises:

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 steps of:

s2201: receiving initial transmission of downlink data sent by a network device through a hybrid automatic repeat request HARQ process Y of an unlicensed Cell U-Cell;

s2202: determining that the retransmission mode of the downlink data is retransmission through an L-Cell of an authorized Cell; and receiving the retransmission of the downlink data by the network equipment through the L-Cell.

Optionally, before receiving the retransmission of the downlink data by the network device through the L-Cell, the method further includes:

receiving cross-HARQ entity/cross-Cell transmission configuration information sent by network equipment, and determining that the retransmission mode of the downlink data is retransmission through an L-Cell according to the received cross-HARQ entity/cross-Cell transmission configuration information.

Optionally, a retransmission mode of the downlink data retransmitted through the L-Cell is preset, and the L-Cell is a primary Cell PCell in communication with the current UE.

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

receiving retransmission of the downlink data by the network device through the L-Cell, including: and receiving the retransmission of the downlink data on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

indication information of retransmission;

identification of U-Cell; and

identification of HARQ process Y.

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

receiving initial transmission of downlink data sent by a network device through an HARQ process Y of a U-Cell, comprising: and 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:

indication information of initial transmission;

identification of U-Cell; and

identification of HARQ process Y.

Optionally, after receiving the retransmission of the downlink data by the network device through the L-Cell, the method further includes:

Optionally, the method further comprises:

And sending 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 with the received retransmitted data of the downlink data.

Optionally, before combining with the received retransmitted data of the downlink data, the method further includes:

when a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by a network device through an L-Cell is received, establishing th cache of an HARQ process Y of the L-Cell aiming at a U-Cell or th cache of the HARQ process corresponding to the L-Cell and used for transmitting the retransmission of the downlink data;

after receiving the retransmitted data of the downlink data, caching the received retransmitted data into an established th cache;

the combining with the received retransmitted data of the downlink data includes combining with the retransmitted data received and buffered in the th buffer.

when the HARQ entity corresponding to the L-Cell receives the downlink data of the HARQ process Y of the U-Cell, establishing th cache of the L-Cell aiming at the HARQ process Y or th cache of the HARQ process corresponding to the L-Cell and used for transmitting retransmission of the downlink data, and caching the received data of the HARQ process Y of the U-Cell into th cache;

and combining the data with the received retransmitted retransmission data, wherein when the retransmitted retransmission data of the HARQ process Y sent by the network equipment through the L-Cell is received, the data of the HARQ process Y of the U-Cell received and buffered in the th buffer is combined with the received retransmitted retransmission data.

Optionally, after sending the data in the buffer of HARQ process Y of the U-Cell of the current UE to the HARQ entity corresponding to the L-Cell of the current UE, the method further includes:

and clearing the data in the buffer of the HARQ process Y corresponding to the U-Cell of the current UE.

Other optional implementation details of the method can refer to the foregoing user equipment 202, and the repetition is not repeated here

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 steps of:

s2301: receiving the transmission of downlink data by the network equipment through a hybrid automatic repeat request HARQ process Y of an unauthorized Cell U-Cell;

s2302: determining that no or lack of available downlink resources for scheduling the current user equipment UE to transmit the downlink data exists on the U-Cell, and determining that the network equipment receives the downlink data transmission performed again through an authorized Cell L-Cell;

s2303: and receiving the downlink data transmission which is carried out again by the network equipment through the L-Cell.

Optionally, determining that the downlink data transmission resumed by the network device is received through the L-Cell includes: determining initial transmission and retransmission of the downlink data by receiving the network equipment through the L-Cell;

receiving the transmission of the downlink data, which is performed again by the network device through the L-Cell, including:

and receiving the initial transmission and retransmission of the downlink data by the network equipment through the L-Cell.

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

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

receiving cross-HARQ entity/cross-Cell transmission configuration information sent by network equipment, and determining that the L-Cell replaces the U-Cell to perform initial transmission and retransmission of the downlink data when no or no available downlink resource for scheduling the current UE to transmit the downlink data exists on the U-Cell according to the cross-HARQ entity/cross-Cell transmission configuration information.

Optionally, when there is no or lack of available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, a transmission mode of the L-Cell instead of the U-Cell for initial transmission and retransmission of the downlink data is preset.

Optionally, when there is no or lack of available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, a transmission mode of the L-Cell instead of the U-Cell to perform initial transmission and retransmission of the downlink data is preset, and the L-Cell is a primary Cell PCell in communication with the current UE.

Optionally, after determining the initial transmission and retransmission of the downlink data performed by the receiving network device through the L-Cell, and before determining the initial transmission and retransmission of the downlink data performed by the receiving network device through the L-Cell, the method further includes:

receiving th resource status indication message sent by the network equipment, wherein the th resource status indication message is used for indicating the current UE that no available downlink resource for scheduling the current UE to transmit the downlink data exists or lacks on the U-Cell:

determining, upon receipt of the th resource status indication message, that initial transmission and retransmission of the downlink data need to be received from a cell using a licensed spectrum in communication with the current UE, or

After receiving the th resource status indication message, starting th timer, before the th timer expires, if there is no available downlink resource or lack of available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, determining that initial transmission and retransmission of the downlink data need to be received from a Cell using the licensed spectrum, which is in communication with the current UE.

Optionally, the method further includes receiving th resource status indication message sent by the network device, wherein the th resource status indication message is used for indicating that no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists on the U-Cell after the th valid time period;

determining that initial transmission and retransmission of the downlink data need to be received from a cell using a licensed spectrum in communication with the current UE after a -th valid time period after receiving the -th resource status indication message, or

After the valid time length after receiving the th resource status indication message, starting a th timer, and before the th timer expires, if there is no available downlink resource or lack of available downlink resource on the U-Cell for scheduling the current UE to transmit the downlink data, determining that the initial transmission and retransmission of the downlink data need to be received from the Cell using the licensed spectrum, which is in communication with the current UE.

Optionally, after determining that the initial transmission and retransmission of the downlink data need to be received from the cell using the licensed spectrum, which is in communication with the current UE, the method further includes:

and emptying the buffer of the HARQ process Y on the U-Cell.

Optionally, the method further comprises:

and after receiving the second resource state indication message, if the second effective time length is determined to be larger than a preset resource effective time length threshold, determining that the downlink data needs to be received from the U-Cell.

Optionally, receiving the retransmission of the downlink data by the network device through the L-Cell, includes:

Optionally, the receiving network device retransmits the downlink data through the L-Cell, including:

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

receiving configuration information of cross-HARQ entity/cross-cell retransmission sent by network equipment, and determining according to the configuration information of cross-HARQ entity/cross-cell retransmission: and when no or lack of available downlink resources for scheduling the current UE to transmit the downlink data exists in the U-Cell, the HARQ process X of the L-Cell replaces the HARQ process Y of the U-Cell to retransmit the downlink data.

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

receiving the retransmission of the downlink data by the network device through the HARQ process X of the L-Cell, including: and receiving the retransmission of the downlink data on the downlink resource on the L-Cell scheduled by the cross-HARQ entity/cross-Cell retransmission scheduling signaling.

and receiving configuration information sent by network equipment and used for sending cross-HARQ entity/cross-Cell retransmission, and according to the configuration information sent by the cross-HARQ entity/cross-Cell retransmission, when determining that no or no available downlink resource used for scheduling the current UE to transmit the downlink data exists on the U-Cell, the L-Cell replaces the U-Cell to retransmit the downlink data.

Optionally, when there is no or lack of available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, a transmission mode for the L-Cell to perform retransmission of the downlink data instead of the U-Cell is preset.

Optionally, when there is no available downlink resource or lacks available downlink resource for scheduling the current UE to transmit the downlink data on the U-Cell, a transmission mode for the L-Cell to perform retransmission of the downlink data instead of the U-Cell is preset; the L-Cell is a primary Cell PCell which communicates with the current UE.

receiving a cross HARQ entity/cross Cell retransmission scheduling signaling sent by network equipment through an L-Cell;

identification of U-Cell;

identification of HARQ process Y.

the current UE can use HARQ process identification on the U-Cell; or

The range of HARQ process identifiers which can be used by the current UE on the U-Cell; or

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

receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by a network device through an L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling comprises: identification of HARQ process Y;

determining a cross-HARQ entity/cross-Cell retransmission scheduling signaling for scheduling the current UE to receive the retransmission of the downlink data from the L-Cell according to the received U-Cell configuration information;

Optionally, the method further comprises:

after receiving the th indication information, determining that the retransmission of the downlink data of the HARQ process Y of the U-Cell needs to be received from the Cell which uses the authorized spectrum and communicates with the current UE, or that the retransmission of all the HARQ processes on the U-Cell needs to be received from the Cell which uses the authorized spectrum and communicates with the current UE, or that the retransmission of the appointed HARQ process on the U-Cell needs to be received from the Cell which uses the authorized spectrum and communicates with the current UE.

Optionally, the method further comprises:

the receiving network equipment sends th instruction information;

determining from the th instruction:

Optionally, if it is determined that 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 communicating with the current UE, then

Optionally, the method further comprises:

receiving second indication information sent by the network equipment, wherein the second indication information is used for indicating: available downlink resources for scheduling the current UE to transmit the downlink data exist on the U-Cell; after receiving the second indication information, receiving the downlink data of the HARQ process Y from the U-Cell; or

Receiving second indication information sent by the network equipment, and determining: and when available downlink resources for scheduling the current UE to transmit the downlink data exist in the U-Cell, receiving the downlink data of the HARQ process Y from the U-Cell.

Optionally, after receiving the transmission of the downlink data, which is performed again by the network device through the L-Cell, the method further includes:

Optionally, the method further comprises:

For other optional implementation details of the method, reference may be made to the implementation of the user equipment 202, and repeated details are 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 through an unlicensed Cell U-Cell using an unlicensed spectrum, and retransmits the downlink data to the UE or retransmits the downlink data to the UE through an licensed Cell L-Cell using an licensed spectrum, so as to avoid a problem that when resources are lacked on the unlicensed spectrum, a delay of a partial data packet transmitted on the unlicensed spectrum is too large.

Furthermore, the present invention may take the form of a computer program product embodied on or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

It is to be understood that each flow and/or block in the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions which can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flow diagram flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Having described preferred embodiments of the invention, further alterations and modifications may be effected to these embodiments by those skilled in the art having the benefit of the basic inventive concepts .

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1, network device, comprising:

the transceiver module is further configured to: retransmitting the downlink data to the UE through the L-Cell;

the transceiver module is further configured to: after the initial transmission of downlink data is carried out on UE through an HARQ process Y of a U-Cell, sending a cross-HARQ entity/cross-Cell retransmission scheduling signaling to the UE through the L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling is used for indicating the UE to receive the retransmission of the downlink data from the L-Cell.

2. The network device of claim 1, wherein the transceiver module is further to:

3. The network device of claim 1,

4. The network device of claim 1,

5. The network device of any one of claims 2-4 and , wherein the transceiver module is specifically configured to:

6. The network device of claim 5, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

indication information of retransmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

7. The network device of claim 5, wherein the transceiver module is further to:

8. The network device of claim 7, wherein the cross-carrier scheduling signaling comprises:

indication information of initial transmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

9. The network device of any of claims 1-4, wherein the transceiver module is further configured to, after the transceiver module retransmits the downlink data to the UE via the L-Cell,

10, network device, comprising:

a processing module, configured to determine that there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, and determine that initial transmission and retransmission of the downlink data are performed to the UE through an authorized Cell L-Cell;

the transceiver module is further configured to: and performing initial transmission and retransmission of the downlink data to the UE through the L-Cell.

11. The network device of claim 10, wherein the transceiver module is specifically configured to:

12. The network device of claim 10, wherein the transceiver module is further to: before performing initial transmission and retransmission of the downlink data to the UE through an L-Cell,

13. The network device of claim 10,

14. The network device of claim 10,

15. The network device of any , wherein the transceiver module is further configured to, after the processing module determines that initial transmission and retransmission of the downlink data are performed to the UE through an authorized Cell L-Cell, before the transceiver module performs initial transmission and retransmission of the downlink data to the UE through the L-Cell,

16. The network device of claim 15, wherein the transceiver module is further to:

17. The network device of claim 10,

and retransmitting the downlink data to the UE through the L-Cell.

18. The network device of claim 17, wherein the transceiver module is specifically configured to:

19. The network device of claim 18, wherein the transceiver module is further to: before retransmission of the downlink data to the UE is performed through HARQ process X of L-Cell,

20. The network device of claim 18,

21. The network device of claim 20,

22. The network device of any , wherein the transceiver module is further configured to, after transmission of downlink data to the UE via HARQ process Y of the U-Cell,

23. The network device of claim 17, wherein the transceiver module is further to: before the retransmission of the downlink data to the UE through the L-Cell,

24. The network device of claim 17,

25. The network device of claim 17,

26. The network device of any of claims 23 to 25 to ,

27. The network device of claim 26, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

an identification of the U-Cell;

identification of the HARQ process Y.

28. The network device of any of claims 23-25, wherein the identity of the L-Cell HARQ process and the identity of the U-Cell HARQ process are allocated independently.

29. The network device of claim 17,

HARQ process identification usable by the UE on the U-Cell; or

A range of HARQ process identities usable by the UE on the U-Cell; or

30. The network device of claim 29, wherein the transceiver module is further configured to: after downlink data transmission is performed to the UE through HARQ process Y of the U-Cell,

an identification of the HARQ process Y;

31. The network device of claim 29 or 30, wherein an identity of the L-Cell HARQ process and an identity of the U-Cell HARQ process are different.

32. The network device of any of claims 17-21, and 23-25, 29, and 30, wherein the transceiver module is further configured to:

33. The network device of any of claims 17-21 and 23-25, 29, and 30, wherein the transceiving module is further configured to send indication information to the UE, the indication information indicating that the UE:

34. The network device of claim 32, wherein the UE needs to receive a retransmission of the downlink data for a designated HARQ process on the U-Cell from a Cell using a licensed spectrum in communication with the UE if the -indicating information indicates that the UE needs to receive the retransmission of the downlink data for the designated HARQ process on the U-Cell

35. The network device of claim 32, wherein the transceiver module is further configured to:

36. The network device of any of claims 17-21 and 23-25, 29 and 30, wherein the transceiver module is further configured to, after retransmission of the downlink data to the UE via the L-Cell,

37, A UE, comprising:

the transceiver module is further configured to: receiving retransmission of the downlink data by the network device through the L-Cell;

the transceiver module is further configured to: after receiving initial transmission of downlink data sent by the network device through an HARQ process Y of a U-Cell, receiving cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through the L-Cell, wherein the cross-HARQ entity/cross-Cell retransmission scheduling signaling is used for indicating the UE to receive retransmission of the downlink data from the L-Cell;

the processing module is further configured to: and determining to receive retransmission of the downlink data from the L-Cell according to the cross-HARQ entity/cross-Cell retransmission scheduling signaling received by the transceiver module.

38. The UE of claim 37,

39. The UE of claim 37,

40. The UE of claim 37,

41. The UE of any of claims 38-40,

42. The UE of claim 41, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

indication information of retransmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

43. The UE of claim 41,

44. The UE of claim 43, wherein the cross-carrier scheduling signaling comprises:

indication information of initial transmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

45. The UE of any of claims 37-40, wherein,

46. The UE of claim 41, wherein the processing module is further to:

47. The UE of claim 46, wherein the processing module is further to: before combining with the retransmitted data of the downlink data received by the transceiving module,

48. The UE of claim 46,

49. The UE of claim 46, wherein the processing module is further to:

The UE of 50, , comprising:

a processing module, configured to determine that there is no or lack of available downlink resources on the U-Cell for scheduling a current user equipment UE to transmit the downlink data, and determine to receive, through an authorized Cell L-Cell, initial transmission and retransmission of the downlink data by the network device;

the transceiver module is further configured to: and receiving the initial transmission and retransmission of the downlink data performed by the network equipment through the L-Cell.

51. The UE of claim 50, wherein the transceiver module is specifically configured to:

52. The UE of claim 50,

53. The UE of claim 50,

54. The UE of claim 50,

55. The UE of any of claims 52 to 54, wherein the transceiver module is further configured to, after the processing module determines that initial transmission and retransmission of the downlink data by the network device are received through the L-Cell, receive the initial transmission and retransmission of the downlink data by the network device through the L-Cell,

the processing module is further configured to:

56. The UE of any of claims 52 to 54, wherein the transceiver module is further configured to receive a th resource status indication message sent by the network device, wherein the th resource status indication message is used to indicate that no or lack of available downlink resources for scheduling the UE to transmit the downlink data exists on the U-Cell after a th active time period;

the processing module is further configured to:

57. The UE of claim 55, wherein the processing module is further to: after determining that initial transmission and retransmission of the downlink data need to be received from a cell using a licensed spectrum in communication with the UE,

emptying the buffer of the HARQ process Y on the U-Cell.

58. The UE of claim 55, wherein the transceiver module is further to:

the processing module is further configured to:

59. The UE of claim 55,

the transceiver module is further configured to:

the processing module is further configured to:

60. The UE of claim 50,

the transceiver module is specifically configured to:

61. The UE of claim 60, wherein the transceiver module is specifically configured to:

62. The UE of claim 61,

63. The UE of claim 62,

64. The UE of claim 61,

65. The UE of any of claims 62 to 64, wherein the transceiver module is further configured to, after receiving a transmission of downlink data by a network device through HARQ process Y of the U-Cell,

66. The UE of claim 60,

67. The UE of claim 60,

68. The UE of claim 60,

69. The UE of any one of claims 66 to 68 and ,

70. The UE of claim 69, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

an identification of the U-Cell;

identification of the HARQ process Y.

71. The UE of any of claims 66-68, wherein the identity of the L-Cell HARQ process and the identity of the U-Cell HARQ process are allocated independently.

72. The UE of claim 60,

HARQ process identification usable by the UE on the U-Cell; or

A range of HARQ process identities usable by the UE on the U-Cell; or

73. The UE of claim 72,

74. The UE of claim 72 or 73, wherein an identity of the L-Cell HARQ process and an identity of the U-Cell HARQ process are different.

75. The UE of any of claims 60 to 64 and ,

76. The UE of any of claims 60 to 64 and ,

77. The UE of claim 75, wherein the indicating information includes identification information of a designated HARQ process on the U-Cell if the processing module determines that a retransmission of the downlink data for the designated HARQ process needs to be received from a Cell using a licensed spectrum with which a current UE is communicating.

78. The UE of claim 75,

79. The UE of any one of claims 60 to 64 and , wherein the transceiver module is further configured to, after receiving the downlink data transmission resumed by the network device through the L-Cell, send feedback information for retransmission of the downlink data of the HARQ process Y to the network device if a timing synchronization timer (TAT) of a Time Advance Group (TAG) in which the U-Cell is located does not time out after a TAT of the TAG in which the L-Cell is located times out.

80. The UE of claim 65, wherein the processing module is further to:

81. The UE of claim 80,

82. The UE of claim 80,

83. The UE of claim 80, wherein the processing module is further to:

84, method for transmitting downlink data, comprising:

Retransmitting the downlink data to the UE through the L-Cell;

after the initial transmission of downlink data to the UE is performed through the HARQ process Y of the U-Cell, the method further includes:

sending, by the L-Cell, a cross-HARQ entity/cross-Cell retransmission scheduling signaling to the UE, where the cross-HARQ entity/cross-Cell retransmission scheduling signaling is used to instruct the UE to receive retransmission of the downlink data from the L-Cell.

85. The method of claim 84, wherein prior to the retransmission of the downlink data to the UE via the L-Cell, further comprising:

86. The method of claim 84,

87. The method of claim 84,

88. The method of any one of claims 85 to 87 and , wherein the retransmitting, by the L-Cell, the downlink data to the UE comprises:

89. The method of claim 88, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

indication information of retransmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

90. The method of claim 88, wherein prior to the initial transmission of downlink data to the UE via HARQ process Y of the U-Cell, further comprising:

91. The method of claim 90, wherein the cross-carrier scheduling signaling comprises:

indication information of initial transmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

92. The method of any one of claims 84-87 and , wherein after the retransmission of the downlink data to the UE via the L-Cell, further comprising:

93. method for transmitting downlink data, comprising:

determining that there is no or lack of available downlink resources on the U-Cell for scheduling the UE to transmit the downlink data, and determining that initial transmission and retransmission of the downlink data are performed to the UE through an authorized Cell L-Cell;

94. The method of claim 93, wherein the transmitting downlink data to the UE through HARQ process Y of the U-Cell comprises:

95. The method of claim 93, wherein prior to the initial transmission and retransmission of the downlink data to the UE via the L-Cell, further comprising:

96. The method of claim 93,

97. The method of claim 93,

98. The method of any of claims 94-97, wherein after the determining that the initial transmission and retransmission of the downlink data is to be made to the UE through an L-Cell of a licensed Cell, and before the initial transmission and retransmission of the downlink data is to be made to the UE through the L-Cell, further comprising:

99. The method of claim 98, further comprising:

100. The method of claim 93,

the retransmitting, to the UE, the downlink data through the L-Cell includes:

and retransmitting the downlink data to the UE through the L-Cell.

101. The method of claim 99, wherein the retransmitting, by the L-Cell, the downlink data to the UE comprises:

102. The method of claim 101, wherein before the retransmission of the downlink data to the UE through HARQ process X of L-Cell, further comprising:

103. The method of claim 101,

104. The method of claim 101,

105. The method of any of claims 102-104 and , wherein after the transmission of downlink data to the UE over HARQ process Y of the U-Cell, further comprising:

106. The method of claim 100, wherein prior to the retransmission of the downlink data to the UE via the L-Cell, further comprising:

107. The method of claim 100,

108. The method of claim 100,

109. The method of any one of claims 106 to 108 to ,

110. The method of claim 109, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

an identification of the U-Cell;

identification of the HARQ process Y.

111. The method of any of claims 106-108, wherein the identity of the L-Cell HARQ process and the identity of the U-Cell HARQ process are allocated independently.

112. The method of claim 100,

HARQ process identification usable by the UE on the U-Cell; or

A range of HARQ process identities usable by the UE on the U-Cell; or

113. The method of claim 112, wherein after the transmitting downlink data to the UE through HARQ process Y of the U-Cell, further comprising:

114. The method of claim 112 or 113, wherein an identity of the L-Cell HARQ process and an identity of the U-Cell HARQ process are different.

115. The method of any one of claims 100 to 104 and , further comprising:

116. The method of any of claims 100-104, further comprising sending indication information to the UE, the indication information indicating that the UE:

117. The method of claim 115, wherein the UE needs to receive a retransmission of the downlink data for a designated HARQ process on the U-Cell from a Cell using a licensed spectrum in communication with the UE if the th indication information indicates that the UE needs to receive the retransmission of the downlink data for the designated HARQ process on the U-Cell

118. The method of claim 115, further comprising:

119. The method of any one of claims 100-104 and , wherein after the retransmission of the downlink data to the UE via the L-Cell, further comprising:

120, downlink data transmission method, comprising:

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

receiving a cross-HARQ entity/cross-Cell retransmission scheduling signaling sent by the network device through the L-Cell, and determining to receive retransmission of the downlink data from the L-Cell according to the received cross-HARQ entity/cross-Cell retransmission scheduling signaling.

121. The method of claim 120, wherein prior to said receiving the retransmission of the downlink data by the network device over the L-Cell, further comprising:

122. The method of claim 120,

123. The method of claim 120,

124. The method according to any one of claims 121-123 and , wherein after receiving the initial transmission of downlink data sent by the network device through HARQ process Y of U-Cell, further comprising:

125. The method of claim 124, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

indication information of retransmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

126. The method of claim 124, wherein prior to the receiving the initial transmission of downlink data sent by the network device over HARQ process Y of U-Cell, further comprising:

127. The method of claim 126, wherein the cross-carrier scheduling signaling comprises:

indication information of initial transmission;

an identification of the U-Cell; and

identification of the HARQ process Y.

128. The method of any one of claims 120-123 and , wherein after the receiving the retransmission of the downlink data by the network device over the L-Cell, further comprising:

129. The method of claim 123, further comprising:

130. The method of claim 129,

131. The method of claim 129,

132. The method of any of claims 129-131, wherein after the sending data in the buffer 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, further comprising:

133, method for transmitting downlink data, comprising:

determining that no or lack of available downlink resources for scheduling the current User Equipment (UE) to transmit the downlink data exists on the U-Cell, and determining that initial transmission and retransmission of the downlink data performed by the network equipment are received through an authorized Cell (L-Cell);

and receiving the initial transmission and retransmission of the downlink data performed by the network equipment through the L-Cell.

134. The method of claim 133, wherein the receiving the transmission of downlink data by the network device through HARQ process Y of U-Cell comprises:

135. The method of claim 133, wherein prior to said receiving the initial transmission and retransmission of the downlink data by the network device over HARQ process Y of the U-Cell, further comprising:

136. The method of claim 133,

137. The method of claim 133,

138. The method of any of claims 135-137, wherein after the determining that the initial transmission and retransmission of the downlink data by the network device is received through the L-Cell, the receiving the initial transmission and retransmission of the downlink data by the network device through the L-Cell further comprises:

139. The method of any of claims 135-137, further comprising receiving a resource status indication message sent by the network device, the resource status indication message indicating that there are no or lack of available downlink resources on the U-Cell for scheduling the current UE to transmit the downlink data after a active time period;

140. The method of claim 138, wherein after the determining that 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, further comprising:

emptying the buffer of the HARQ process Y on the U-Cell.

141. The method of claim 138, further comprising:

142. The method of claim 138, further comprising:

143. The method of claim 133,

144. The method of claim 143, wherein the receiving the retransmission of the downlink data by the network device over the L-Cell comprises:

145. The method of claim 144, wherein prior to the receiving the retransmission of the downlink data by the network device over HARQ process X of the L-Cell, further comprising:

146. The method of claim 144,

147. The method of claim 144,

148. The method of any one of claims 145 to 147, wherein the recombinant host cell is a cell,

149. The method of claim 143, wherein prior to the receiving the retransmission of the downlink data by the network device over the L-Cell, further comprising:

150. The method of claim 143,

151. The method of claim 143,

152. The method of claim 149,

153. The method of claim 152, wherein the cross-HARQ entity/cross-cell retransmission scheduling signaling comprises:

an identification of the U-Cell;

identification of the HARQ process Y.

154. The method of claim 149, wherein the identity of the L-Cell HARQ process and the identity of the U-Cell HARQ process are allocated independently.

155. The method of claim 143,

156. The method of claim 155, wherein after receiving transmission of downlink data by the network device over HARQ process Y of U-Cell, further comprising:

157. The method of claim 155, wherein an identity of the L-Cell HARQ process and an identity of the U-Cell HARQ process are different.

158. The method of claim 143, further comprising:

159. The method of claim 143, further comprising:

receiving th indication information sent by the network equipment;

determining from the th indication information:

160. The method of claim 158, wherein if it is determined that a retransmission of the downlink data for a designated HARQ process on the U-Cell needs to be received from a Cell using a licensed spectrum that is in communication with a current UE, then

161. The method of claim 158, further comprising:

162. The method of claim 143, wherein after said receiving the transmission of the downlink data by the network device over the L-Cell anew, further comprising:

163. The method of claim 148, further comprising:

164. The method of claim 163,

165. The method of claim 163,

166. The method of claim 163, wherein after the sending data in the buffer for the HARQ process Y of the U-Cell for the current UE to the HARQ entity corresponding to the L-Cell for the current UE, further comprising:

167, computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when executed, cause a communication device to perform the method of any of claims 84-166 to .

168, apparatus for transmitting downstream data, the apparatus comprising a processor and a storage medium having stored thereon instructions that, when executed by the processor, cause the apparatus to perform the method according to any of claims 84-166, .