CN105790897B

CN105790897B - Method and equipment for hybrid automatic repeat request (HARQ)

Info

Publication number: CN105790897B
Application number: CN201410836380.2A
Authority: CN
Inventors: 李迎阳; 孙程君
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2014-12-26
Filing date: 2014-12-26
Publication date: 2020-10-30
Anticipated expiration: 2034-12-26
Also published as: KR20160079647A; CN105790897A

Abstract

The application discloses a method for processing cross-carrier HARQ transmission, which comprises the following steps: the UE receives configuration information of a base station about cross-carrier HARQ transmission; and the UE receives the downlink control information sent by the base station and correspondingly receives downlink data or sends uplink data. The method supports the completion of HARQ transmission of the same data on a plurality of CCs, thereby improving the effectiveness of the HARQ transmission and improving the performance of data transmission.

Description

Method and equipment for hybrid automatic repeat request (HARQ)

Technical Field

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for processing a hybrid automatic repeat request (HARQ) in a Long Term Evolution (LTE) system.

Background

The Long Term Evolution (LTE) system of the 3GPP standardization organization supports two duplexing modes, Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD). As shown in fig. 1, fig. 1 is a schematic diagram of an FDD radio frame structure in the prior art, and for an FDD system, each radio frame is 10ms in length and includes 10 subframes with a length of 1 ms. A subframe is composed of two consecutive slots with a length of 0.5ms, i.e., the kth subframe includes slot 2k and slot 2k +1, where k is 0, 1. As shown in fig. 2, fig. 2 is a schematic diagram of a TDD radio frame structure in the prior art, and for a TDD system, each radio frame of 10ms is equally divided into two half frames with a length of 5 ms. Each half frame includes 8 subframes with a length of 0.5ms and 3 special fields, namely, a downlink pilot time slot (DwPTS), a Guard Period (GP), and an uplink pilot time slot (UpPTS), and the sum of the lengths of the 3 special fields is 1 ms. Each subframe consists of two consecutive time slots, i.e. the kth subframe contains time slot 2k and time slot 2k +1, k being 0, 1. One downlink Transmission Time Interval (TTI) is defined on one subframe.

When configuring a TDD radio frame, 7 uplink and downlink configurations are supported, as shown in table 1. Here, D represents a downlink subframe, U represents an uplink subframe, and S represents the above-described special subframe including 3 special fields.

TABLE 1

The first n Orthogonal Frequency Division Multiplexing (OFDM) symbols of each Downlink subframe may be used to transmit Downlink control information, where the Downlink control information includes a Physical Downlink Control Channel (PDCCH) and other control information, where n is equal to 0,1, 2, 3, or 4; the remaining OFDM symbols may be used to transmit a Physical Downlink Shared Channel (PDSCH) or an enhanced pdcch (epdcch). In the LTE system, the PDCCH and the EPDCCH carry Downlink Control Information (DCI) for allocating an uplink channel resource or a downlink channel resource, which are respectively referred to as a downlink Grant signaling (DL Grant) and an uplink Grant signaling (UL Grant). In the LTE system, DCI of different User Equipments (UEs) is independently transmitted, and a DL Grant and an UL Grant thereof are independently transmitted.

In an enhanced system of the LTE system, a larger operation bandwidth is obtained by combining a plurality of Component Carriers (CCs), that is, a downlink and an uplink of a communication system are configured by Carrier Aggregation (CA), thereby supporting a higher transmission rate. Here, the aggregated CCs may use the same duplexing method, i.e., all FDD cells or all TDD cells, or may use different duplexing methods, i.e., both FDD cells and TDD cells exist. For a UE, a base station may configure it to operate in multiple cells, one of which is the primary Cell (pcell) and the others are referred to as secondary cells (scells). In the CA system, for the same Transport Block (TB), the initial transmission and the retransmission are restricted to be transmitted on the same element carrier. For the lte ca system, hybrid automatic repeat request response (HARQ-ACK) and Channel State Information (CSI) based on Physical Uplink Control Channel (PUCCH) transmission are performed only on the Pcell.

The above LTE system is generally deployed on a licensed frequency band, which can avoid interference of other systems. There are unlicensed bands in addition to licensed bands. Unlicensed frequency bands have typically been allocated for some other use, such as radar systems and/or 802.11 family wireless local area network (WiFi) systems. The 802.11 family of WiFi systems operate based on a carrier sense multiple access/collision avoidance (CSMA/CA) mechanism, in which a mobile Station (STA) must detect a radio channel before transmitting a signal, and can occupy the radio channel to transmit a signal only after the radio channel is idle and maintained for a certain period of time. The STA may jointly use two mechanisms to jointly determine the wireless channel status. In one aspect, the STA may actually detect the wireless channel using carrier sensing (carrier sensing), and when signals of other STAs are detected or the detected signal power exceeds a set threshold, confirm that the wireless channel is busy. At this time, the physical layer module in the STA reports a Clear Channel Assessment (CCA) report indicating that the radio Channel is busy to its higher layer module. On the other hand, the WiFi systems of the 802.11 series also introduce a virtual carrier sense technique, that is, a system allocation vector (NAV), which includes a duration field in each 802.11 frame, and confirms that a signal cannot be transmitted on a wireless channel according to a NAV value set in the duration field, where the NAV indicates a time required to reserve the wireless channel.

In order to meet the demand for an increase in mobile communication traffic for the LTE system, it is necessary to explore more spectrum resources. Deployment of LTE systems on unlicensed bands is one possible solution. In the existing lte ca system, the initial transmission and HARQ retransmission for the same TB are limited to the same CC. However, in the unlicensed frequency band, to avoid interference with other devices, similar to a WiFi contention mechanism, the LTE device needs to detect the state of a channel before sending a signal, and only when a channel occupancy condition is satisfied, the device can occupy the channel; also, the channel occupancy time of a device may be one or more subframes, and then the channel must be released, leaving the opportunity for other devices to occupy the channel. Therefore, after an LTE device seizes a channel and transmits data, the channel resources have to be released, and when the number of devices participating in contention on a carrier is large, the LTE device may take a relatively long time to seize the channel again, and then HARQ retransmission can be performed on the previous unsuccessful data. This limits the effectiveness of HARQ transmissions to a large extent.

Disclosure of Invention

The application provides a method and equipment for HARQ transmission, which can realize cross-carrier HARQ transmission, enable error data to be retransmitted quickly and improve the performance of data transmission.

In order to achieve the purpose, the following technical scheme is adopted in the application:

a method of hybrid automatic repeat request, HARQ, transmission, comprising:

receiving configuration information of a base station about cross-carrier HARQ transmission by UE adopting carrier aggregation CA;

the UE receives downlink control information sent by a base station and correspondingly receives downlink data or sends uplink data on a data channel scheduled by the UE according to the configuration information; wherein the data channels for initial transmission and retransmission of the same scheduled data are allowed to be located on different CCs.

Preferably, the UE receives CC indication information for identifying a CC of the current scheduling data; the data with the same CC indication information is allowed to be transmitted on the data channels of different CCs;

the transmission of the uplink data or the downlink data comprises: carrying out HARQ combination on the data of the same HARQ process ID with the same CC indication information and the retransmission thereof; wherein, one HARQ process carries out joint identification through CC indication information and HARQ process ID.

Preferably, the CC indication information is an index of one CC in all CCs configured to the UE;

or, when all CCs configured to the UE are divided into a plurality of groups and cross-carrier HARQ transmission is only limited to be performed in each group, the CC indication information is an index of one CC in the group in which the CC is located.

Preferably, when the CC indicated by the CC indication information adopts a transmission mode TM configured with one transport block TB and the CC where the scheduled data channel is located adopts a TM configured with two TBs, the manner of transmitting data on the scheduled data channel includes:

limiting the scheduled data channel to schedule data of only one TB; for normal DCI, the manner of determining the TB allowed to be scheduled is as follows: taking a fixed one of the two TBs as a scheduling-allowed TB, or determining the scheduling-allowed TB according to the control information of the two TBs in the DCI;

or one of the TBs transmitted on the scheduled data channel is data of a CC indicated by the CC indication information, and the other TB transmitted is data of a CC where the scheduled data channel is located; wherein, the one TB is a pre-designated fixed TB, or a TB indicated by information in a high layer signaling or DCI.

Preferably, when the CC indicated by the CC indication information adopts a TM configured with two TBs and the CC where the scheduled data channel is located adopts a TM configured with one TB, the manner of transmitting data on the scheduled data channel includes:

the data transmitted on the scheduled data channel is a fixed TB on the CC indicated by the CC indication information or a TB specified by specific information;

or, according to a high layer signaling or an information indication in the DCI, determining that data transmitted on the current scheduling data channel is a TB indicated by the information in the CC indicated by the CC indication information;

or, the data transmitted on the scheduled data channel is one TB in the CC indicated by the CC indication information indicated by the NDI field of the DCI format;

or, respectively comparing the NDI of the previous transmission of two TBs of the CC indicated by the CC indication information with the NDI of the current DCI, and if the NDI of only one TB is unchanged, determining that the data transmitted on the scheduled data channel is the TB with the unchanged NDI; otherwise, determining that the data transmitted on the scheduled data channel is a fixed TB of the CC indicated by the CC indication information, or determining that the data transmitted on the scheduled data channel is a TB indicated by the information in the CC indicated by the CC indication information according to a high-level signaling or an information indication in DCI.

Preferably, the CC indicated by the CC indication information is a CC occupied by a physical channel for initial transmission or retransmission of the identified data, or the CC indicated by the CC indication information is any one of CCs configured to the UE.

Preferably, if the currently scheduled data is new data, the index of the CC indicated by the CC indication information in the downlink control information is consistent with the index of the CC where the scheduled data channel is located;

and the CC indicated by the CC indication information is the CC occupied by the physical channel for the initial transmission of the data identified by the CC indication information.

Preferably, the CC indication information is carried by a new definition or an existing information field in a DCI format in downlink control information; or, the CC indication information is carried by one DCI format in a common search space, and the CC indication information is valid for a plurality of consecutive subframes.

Preferably, when the CC indicated by the CC indication information and the CC where the scheduled data channel is located both adopt TM configured with two TBs,

respectively comparing the NDI of the previous transmission of the two TBs of the CC indicated by the CC indication information with the NDI of the current DCI, and if only one of the NDI values of the two TBs changes and the other does not change, transmitting data on the scheduled data channel in a manner including: corresponding to a TB with an unchangeable NDI, the data transmitted on the scheduled data channel is data retransmission of the CC indicated by the CC indication information; corresponding to another TB, the data transmitted on the scheduled data channel is new data of the CC indicated by the CC indication information;

or, corresponding to a TB with an unchanged NDI, the data transmitted on the scheduled data channel is data retransmission of the CC indicated by the CC indication information; and corresponding to another TB, comparing the NDI value of the previous data transmission of the corresponding TB of the CC where the scheduled data channel is located with the NDI value of the current DCI according to the HARQ process ID in the DCI format, and determining that the transmission data is new data or retransmission data of the corresponding TB of the CC where the scheduled data channel is located.

Preferably, when the CC indicated by the CC indication information adopts a transmission mode TM configured with one transport block TB and the CC where the currently scheduled data channel is located adopts a TM configured with two TBs, the manner of transmitting data on the currently scheduled data channel includes:

and respectively comparing the NDI of the previous transmission of the TB of the CC indicated by the CC indication information with the NDI in the current DCI, and when the NDI of only one TB is not changed, determining that the data transmitted on the current scheduling data channel is the TB with the unchanged NDI.

Preferably, the UE receives VCC information of a virtual carrier, which is used to indicate VCC corresponding to current data; wherein, data of the same VCC is allowed to be transmitted on PDSCH of different CCs;

the transmission of the uplink data or the downlink data comprises: carrying out HARQ combination on the data of the same HARQ process ID and the retransmission thereof which are the same with the VCC; wherein one HARQ process is jointly identified by the VCC index and the HARQ process ID.

Preferably, the VCC information is carried by a custom or existing information field in a DCI format in the downlink control information; or, the VCC information is carried by a DCI format in a common search space, and the CC indication information is valid for a plurality of consecutive subframes.

Preferably, the index information of each VCC allocated to the UE is different;

or, when all N CCs configured for the UE are divided into a plurality of groups and cross-carrier HARQ transmission is limited to be performed in each group, respectively, the index information of each VCC is different in the same group.

Preferably, the configuring the transmission mode for each VCC configured to the UE includes:

respectively configuring the number of TBs (transport blocks) allowed to be transmitted simultaneously in one subframe of each VCC by adopting a high-level signaling;

or, uniformly configuring the number of TBs allowed to be carried on one subframe for all the VCCs by using a high-level signaling;

or, predefining the number of TBs allowed to be transmitted simultaneously by each VCC in one subframe;

or, when configuring each CC of the UE, indicating whether the configuration information of the corresponding CC is used for mapping configuration information of one VCC, and obtaining the TM of the VCC corresponding to the CC mapped with the VCC according to the TM of the CC;

or, for a group of CCs configured to the UE, when there is a CC configured with a TM supporting 2 TBs, the number of TBs that each VCC allows to simultaneously carry on one subframe is 2, otherwise, the number of TBs that each VCC allows to simultaneously carry on one subframe of one CC is 1;

or configuring a value X, and for each VCC configured to the UE, configuring the number of TBs allowed to be simultaneously borne by the X VCC on a subframe to be 2; configuring the number of TBs allowed to be simultaneously carried by other M-X VCCs on a subframe to be 1, wherein M is the total number of all VCCs configured to the UE.

Preferably, the method for transmitting data on the scheduled data channel includes:

the data of VCC corresponding to TM configured with single TB is only mapped to CC of TM supporting single TB for transmission, and the data of VCC corresponding to TM configured with double TB is only mapped to CC of TM supporting double TB for transmission;

or, the data of the VCC corresponding to the TM configured with the single TB is only mapped to the CC supporting the TM configured with the single TB for transmission, and the data of the VCC corresponding to the TM configured with the dual TB is allowed to be mapped to any CC for transmission;

or, the data of the VCC of the TM corresponding to the single TB configuration is only mapped to the CC of the TM supporting the dual TB configuration for transmission;

alternatively, data corresponding to any VCC is allowed to be mapped to any CC for transmission.

Preferably, when the VCC adopts a TM configured with one TB and a CC where the scheduled data channel is located adopts a TM configured with two TBs, the scheduled data channel is restricted to schedule data of only one TB, and the TB of the VCC is mapped to the TB allowed to be scheduled; wherein, for normal DCI, the manner of determining that the TB is allowed to be scheduled in the scheduled data channel is:

a fixed TB of the CC where the scheduled data channel is located allows scheduling;

or, judging the TB allowing scheduling according to the control information of the two TBs;

alternatively, the scheduled TB is indicated by higher layer signaling or information in the DCI format.

Preferably, when the VCC employs a TM configured with two TBs and the CC where the scheduled data channel is located employs a TM configured with one TB, the manner of transmitting data on the scheduled data channel includes:

the data transmitted on the scheduled data channel is a fixed TB in the VCC or a TB designated by specific information;

or, according to a high layer signaling or an information indication in the DCI, determining that data transmitted on the scheduled data channel is an indicated TB of the VCC;

or, respectively comparing the NDI of the previous transmission of the two TBs of the VCC with the NDI of the current DCI, and if the NDI of only one TB is unchanged, determining that the data transmitted on the scheduled data channel is the TB with the unchanged NDI; otherwise, determining that the data transmitted on the scheduled data channel is a fixed TB of the VCC, or determining that the data transmitted on the scheduled data channel is an indicated TB of the VCC according to a high-level signaling or an information indication in DCI.

Preferably, the UE receives a joint HARQ process ID for indicating a joint HARQ process corresponding to the current data; wherein, data of the same joint HARQ process is allowed to be transmitted on PDSCHs of different CCs;

the transmission of the uplink data or the downlink data comprises: and carrying out HARQ combination on the data of the same combined HARQ process ID and the retransmission thereof.

Preferably, the joint HARQ process ID of each joint HARQ process is different;

or, when the N CCs configuring the UE are divided into a plurality of groups and cross-carrier HARQ transmission is limited to be performed in each group, the joint HARQ process IDs of each joint HARQ process are different in the same group.

Preferably, the configuring the TM on one CC for each joint HARQ process of the UE includes:

respectively configuring the number of TBs allowed to be simultaneously carried on one subframe of one CC in each combined HARQ process by using high-level signaling;

or, the number of TBs allowed to be simultaneously carried on one subframe of one CC is uniformly configured for all the combined HARQ processes by using high-level signaling;

or predefining the number of TBs allowed to be simultaneously carried on one subframe of one CC in all the combined HARQ processes;

or, for a group of CCs configured to the UE, when there is a CC configured with a TM supporting 2 TBs, the number of TBs allowed to be simultaneously carried by each joint HARQ process on a subframe of the CC is 2, otherwise, the number of TBs allowed to be simultaneously carried by each joint HARQ process on a subframe of the CC is 1;

or configuring a value X, and configuring the number of TBs allowed to be simultaneously borne by the first X combined HARQ processes on a subframe of a CC to be 2 and the number of TBs allowed to be simultaneously borne by other Mg-X combined HARQ processes on a subframe of a CC to be 1 for all combined HARQ processes of the UE; wherein Mg is the total number of joint HARQ processes configured for the UE;

or, determining the number of TBs allowed to be simultaneously carried on one subframe of one CC corresponding to the current HARQ process ID according to the transmission mode of the physical CC occupied by the latest initial transmission of the joint HARQ process ID.

the data corresponding to the joint HARQ process ID configured with the single TB is only mapped to the CC of the TM supporting the single TB for transmission, and the data corresponding to the joint HARQ process ID configured with the double TB is only mapped to the CC of the TM supporting the double TB for transmission;

or, the data corresponding to the joint HARQ process ID configuring the single TB is only mapped to the CC of the TM supporting the single TB for transmission, and the data corresponding to the joint HARQ process ID configuring the dual TB is allowed to be mapped to any one CC for transmission;

or, the data corresponding to the joint HARQ process ID configuring the single TB is allowed to be mapped to any CC for transmission, and the data corresponding to the joint HARQ process ID configuring the dual TB is only mapped to the CC of the TM supporting the dual TB for transmission;

alternatively, data corresponding to any one of the joint HARQ process IDs is allowed to be mapped to any one of the CCs for transmission.

Preferably, when the joint HARQ process adopts a TM configured with one TB and the CC where the scheduled data channel is located adopts a TM configured with two TBs, the scheduled data channel is restricted to schedule data of only one TB, and the TB of the joint HARQ process is mapped to the TB allowed to be scheduled; wherein, for normal DCI, the manner of determining that the TB is allowed to be scheduled in the scheduled data channel is:

Preferably, when the joint HARQ process adopts a TM configured with two TBs and a TM configured with one TB is configured for a CC where the scheduled data channel is located, the method for transmitting data on the scheduled data channel includes:

the data transmitted on the scheduled data channel is a fixed TB or a TB specified by specific information of the joint HARQ process;

or, according to the high layer signaling or the information indication in the DCI, determining that the data transmitted on the scheduled data channel is an indicated TB of the joint HARQ process;

or, respectively comparing the NDI of the previous transmission of two TBs in the joint HARQ process with the NDI of the current DCI, and if the NDI of only one TB is unchanged, determining that the data transmitted on the scheduled data channel is the TB with the unchanged NDI; otherwise, determining that the data transmitted on the scheduled data channel is a fixed TB of the joint HARQ process, or determining that the data transmitted on the scheduled data channel is an indicated TB of the joint HARQ process according to a high layer signaling or an information indication in DCI.

An apparatus for hybrid automatic repeat request, HARQ, transmission, comprising: configuring a receiving unit, a scheduling unit and a data transmitting/receiving unit;

the configuration receiving unit is used for receiving configuration information of the base station about cross-HARQ transmission;

the scheduling unit is configured to receive downlink control information sent by a base station, and determine a data channel scheduled by the downlink control information;

and the data sending/receiving unit is configured to receive downlink data or send uplink data on the data channel determined by the scheduling unit according to the configuration information.

As can be seen from the above technical solutions, in the present application, the UE supporting CA receives configuration information and downlink control information about cross-carrier HARQ transmission from a base station, and performs downlink data reception or uplink data transmission according to the configuration information on a data channel scheduled by the downlink control information. The PDSCH for initial transmission and retransmission of the same scheduling data can be located on different CCs, and HARQ transmission of the same data is completed on a plurality of CCs, so that the effectiveness of HARQ transmission is improved, and the performance of data transmission is improved.

Drawings

Fig. 1 is an LTE FDD frame structure;

fig. 2 is an LTE TDD frame structure;

fig. 3 is a general flowchart of an HARQ transmission method according to the present application;

fig. 4 is a general structural diagram of an HARQ transmission apparatus according to the present application.

Detailed Description

For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.

Other wireless communication systems, such as radar or WiFi, may have been deployed on the unlicensed band. Further, on the unlicensed frequency band, when multiple LTE systems may be deployed at the same time, for example, the multiple LTE systems may be respectively affiliated to different operators. For ease of description, the base station and UE are hereinafter referred to broadly with LTE equipment. In order to avoid interference with other LTE devices or devices of other wireless systems, the LTE device needs to detect the state of a channel before sending a signal, and the device can occupy the channel only when a channel occupation condition is satisfied; also, the channel occupancy time of a device may be one or more subframes, and then the channel must be released, leaving the opportunity for other devices to occupy the channel.

In the existing LTE CA system, the initial transmission and HARQ retransmission for the same TB are both limited to the same CC. However, in the unlicensed frequency band, the above method of competing for resources greatly limits the effectiveness of HARQ transmission. Specifically, after an LTE device seizes a channel and transmits data, the LTE device has to release channel resources, and when the number of devices participating in contention on a carrier is large, the LTE device may take a relatively long time to seize the channel again, and then HARQ retransmission can be performed on previous unsuccessful data. In order to fully utilize HARQ transmission to improve the performance of data transmission, it is necessary to support fast retransmission on another carrier for a Transport Block (TB) that is not successfully transmitted. That is, cross-carrier HARQ transmission needs to be supported.

For cross-carrier HARQ transmission, the same data may be transmitted on different CCs, and the number of TBs of the Transmission Mode (TM) of such different CCs may be different. First, each CC has its applicable TM, depending on the channel state in which the CC is located. Thus, when data needs to be transmitted on one CC, whether new data or retransmitted data, the transmission mode configured by the CC should be followed. According to the existing LTE standard, each TM simultaneously supports two DCI formats, for downlink scheduling, the normal DCI format can be DCI 1/1B/1D/2/2A/2B/2C/2D and the like, and the regression (fallback) DCI format is DCI 1A; for uplink scheduling, the normal DCI format may be DCI 4, and the recursive DCI format refers to DCI 0. The normal DCI format may support data transmission of 1 TB or 2 TBs, while the recursive DCI format supports data transmission of only 1 TB. The invention provides a corresponding mechanism to ensure the non-confusing cross-carrier HARQ transmission and retransmission, thereby ensuring the performance of data transmission

Fig. 3 is a flowchart of a method for processing cross-carrier HARQ transmission in an LTE communication system according to the present invention, which mainly includes:

step 301, the UE receives configuration information of the base station regarding cross-carrier HARQ transmission.

The configuration information configures the UE to process data transmission based on cross-carrier HARQ.

Step 302, the UE receives the downlink control information sent by the base station, and correspondingly sends uplink data or receives downlink data on the data channel scheduled by the UE according to the configuration information.

Here, after receiving the downlink control information, the UE may need to combine soft information of two or more transmissions from different CCs for the same data according to its indication, and then decode the data. That is, different transmissions of the same data may be on data channels of different CCs.

The technical solution of the present application is further described in detail by four preferred embodiments.

Example one

When performing cross-carrier HARQ transmission, for one data, the CC where the physical channels for initial transmission and retransmission are located may be different, but the same CC indication information is used for the initial transmission and the retransmission of the data to identify. The CC indicated by the CC indication information may be the same as a certain CC occupied by a physical channel for initial transmission or retransmission of the data; alternatively, any CC configuring the UE may be used. Here, one HARQ process is jointly identified by CC indication information and HARQ process ID. For downlink data transmission, for example, when receiving downlink data, the UE may perform HARQ combining on initial transmission and retransmission of data of the same HARQ process ID with the same CC indication information.

The CC indication information may be transmitted in Downlink Control Information (DCI) for scheduling data transmission, for example, an information field may be added to a DCI format, or an existing information field in the DCI may be reused to send the added CC indication information corresponding to currently scheduled data. Alternatively, the CC indication information may be applied to multiple consecutive subframes of one carrier, for example, for a cell in the unlicensed frequency band, when sending the channel occupancy indication information of the cell, the CC indication information indicates CC indication information corresponding to data transmission on all subframes occupied by the channel at this time. For example, the channel occupancy indication information and the CC indication information applied to a plurality of consecutive subframes are transmitted using one DCI format in a Common Search Space (CSS), and the number of bits of this DCI format is equal to DCI format 1A or 1C, so that the number of blind detections in the DCI format is not increased.

Assuming that N CCs are configured for a UE and cross-carrier HARQ transmission of data for one CC may be performed on any CC, CC indication information in a DCI format may be an index of one CC. Alternatively, when N CCs configuring the UE are divided into a plurality of groups and cross-carrier HARQ transmission is limited to be performed within each group, respectively, the CC indication information in the DCI format may be an index of one CC within the group. For downlink data transmission, for example, for self scheduling (self scheduling) on one CC, the scheduled downlink data occupies the PDSCH of the CC for transmission, that is, the data of the CC indicated by the CC indication information is transmitted on the PDSCH of the CC. For cross-carrier scheduling, the scheduled downlink data is transmitted on the PDSCH of the CC indicated by the CIF field, that is, the data of the CC indicated by the CC indication information is transmitted on the PDSCH of the CC indicated by the CIF field.

For one data transmission, the method of the present invention is described below according to the CC a indicated by the CC indication information and the CC B where the scheduling data channel is located. CC a may be the same as CC B, or different.

Assuming that both CC a and CC B are TM configured with one TB, according to the HARQ process ID in the DCI format, the NDI value of the previous data transmission of CC a and the NDI value of the current DCI are compared, and it is determined that the currently scheduled data is new data or retransmitted. If the value of NDI changes, it is considered as a new data for this HARQ process ID of CC a. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a.

Assuming that both CC a and CC B are TM configured with two TBs, according to the HARQ process ID in the DCI format, for the two TBs, the NDI value of the previous data transmission of CC a and the NDI value of the current DCI are respectively compared, and it is determined that the currently scheduled data is new data or retransmitted. If the NDI values of both TBs change, both TBs are considered new data for this HARQ process ID of CC a. If the NDI values of both TBs are not changed, both TBs are considered to be retransmissions of this HARQ process ID for CC a. If only one TB has an unchanged NDI, the TB with the unchanged NDI is considered as a data retransmission corresponding to the HARQ process ID of CC a, and another TB is considered as new data corresponding to the HARQ process ID of CC a.

Assuming that CC a configures TM of one TB and CC B configures TM of two TBs, the corresponding processing method is described below.

The first method is to restrict the data channel of CC B to schedule data of only one TB. For normal DCI, only one of the TBs may be scheduled, and the TB of CC a is mapped to this TB; while the other TB is Disabled (Disabled). TB1 may be fixedly considered available; alternatively, TB 2 may be fixedly considered available; or, it may also be determined which TB is available according to the control information of two TBs in the normal DCI, for example, the information combination of MCS and RV, that is, the combination of MCS and RV that limits only one TB indicates that this TB is available; or, it is indicated which TB is available through higher layer signaling or other information in the DCI, and accordingly, the UE determines the TB allowed to be scheduled in the CC B according to the indication information. In addition, for the regression DCI, scheduling of only one TB is supported, and the TB of CC a is mapped to this TB. And comparing the NDI value of the previous data transmission of the CC A with the NDI value of the current DCI according to the HARQ process ID in the DCI format, and judging whether the currently scheduled data is new data or retransmission. If the value of NDI changes, it is considered as a new data for this HARQ process ID of CC a. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a.

The second method is for the data channel of CC B, where the data of CC a is transmitted on one of the TBs and the other TB is used for the data transmission of CC B. For normal DCI, it may be fixed that the TB of CC a is TB1 mapped to the data channel scheduled by CC B; alternatively, the TB of CC a may be fixedly considered as TB 2 mapped to the data channel scheduled by CC B; or, the TB of CC a is indicated to which TB of the data channel scheduled on CC B is mapped through higher layer signaling or other information in DCI, and accordingly, the UE determines the TB of CC B that is allowed to be scheduled according to the indication information. In addition, for the regression DCI, only one TB is scheduled, and the TB of the CCA is mapped to this TB. And comparing the NDI value of the previous data transmission of the CCA with the NDI value of the current DCI according to the HARQ process ID in the DCI format corresponding to the TB mapped with the CC A data, and judging whether the currently scheduled data is new data or retransmission. If the value of NDI changes, it is considered as a new data for this HARQ process ID of CC a. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a. And for the TB not mapped with the data of the CC A, comparing the NDI value of the previous data transmission of the TB of the CC B with the NDI value of the current DCI according to the HARQ process ID in the DCI format, and judging that the TB is new data or retransmission of the TB corresponding to the CC B. Here, mapping the TB of CC a to TB 2 of the data channel of CC B is advantageous because the TB scheduled with the recursive DCI on CC B is TB1, and in this way, it is possible to support transmission of the TB of CC a on TB 2 and retransmission of the TB1 of CC B on TB1 at the same time on one subframe of CC B.

Assuming that CC a configures two TBs of TM and CC B configures one TB of TM, the corresponding processing method is described below. Since CC B has only one TB transmission capability, it can be fixedly considered that only TB1 of CC a can be transmitted on CC B. Alternatively, it is fixed that only TB 2 of CC a can be transmitted on CC B. Alternatively, the TB index of the currently transmitted CC a is obtained according to some other information, for example, if the index of one kind of information is k, the TB index of the currently transmitted CC a may be mod (k,2) + 1. The above information for indicating the TB index of the currently transmitted CC a may be one or more of an index of a PDCCH/EPDCCH channel in a search space of the UE, a subframe index, a CC index, and a starting PRB index of an allocated data channel. Or, which TB of the CC a is transmitted in the CC B is indicated by higher layer signaling or other information in the DCI, and accordingly, the UE determines which TB of the CC a the transmitted data is (i.e., the TB indicated by the indication information) according to the indication information. Alternatively, the NDI field in the DCI format directly indicates the currently retransmitted TB, e.g., NDI equal to 0 indicates retransmission for TB1 of CC a, and NDI equal to 1 indicates retransmission for TB 2 of CC a. Or, the NDI of the previous transmission of the two TBs of the CC a is compared with the NDI of the current DCI, and if the NDI of only one TB is unchanged, the TB with unchanged NDI is transmitted on the CC B; further, if the NDIs of the two TBs are not changed or are changed, only TB1 of CC a may be transmitted on CC B, or only TB 2 of CCA may be transmitted on CC B, or which TB of CC a is transmitted on CC B is indicated through higher layer signaling or other information in DCI, and accordingly, the UE determines which TB of CC a the transmitted data is (i.e., the TB indicated by the indication information) according to the indication information. And comparing the NDI value of the previous data transmission of the CC A with the NDI value of the current DCI according to the HARQ process ID in the DCI format corresponding to the TB mapped with the CC A data, and judging whether the currently scheduled data is new data or retransmitted. If the value of NDI changes, it is considered as a new data for this HARQ process ID of CC a. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a. Here, an advantage of allowing the TBs of CC a mapped to CC B transmissions to vary is to avoid that one of the TBs of CC a cannot be retransmitted for a long time. For example, assuming that only TB1 of CC a can be mapped to CCB transmission, when TB 2 of CC a's previous transmission is not correct, TB 2 of CC a cannot be retransmitted on CC B, and at the same time, cannot occupy the channel for a long time on CC supporting TM of 2 TBs, which results in that TB 2 of CC a cannot be retransmitted for a long time, which reduces the performance of HARQ operation.

Example two

When performing cross-carrier HARQ transmission, for one data, the CC in which the physical channels for initial transmission and retransmission are located may be different, but the same CC indication information is used for identification of the initial transmission and retransmission of the data. In particular, the CC indicated by the CC indication information may be a CC occupied by a physical channel for initial transmission of the data. Here, one HARQ process is jointly identified by CC indication information and HARQ process ID. For downlink data transmission, for example, when receiving downlink data, the UE may perform HARQ combining on initial transmission and retransmission of data of the same HARQ process ID with the same CC indication information.

Unlike the first embodiment, in the case of scheduling new data, the present embodiment restricts that CC indication information for identifying data must be consistent with an index of a CC where a scheduled data channel is located. For one data transmission, the method of the present invention is described below according to the CC a indicated by the CC indication information and the CC B where the scheduling data channel is located. CC a may be the same as CC B, or different.

Assuming that both CC a and CC B are TM configured with one TB, according to the HARQ process ID in the DCI format, the NDI value of the previous data transmission of CC a and the NDI value of the current DCI are compared, and it is determined that the currently scheduled data is new data or retransmitted. If the value of NDI changes, it is considered as a new data for this HARQ process ID of CC a. At this time, CC a and CC B are further required to be identical, otherwise it may be considered an error condition. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a.

Assuming that both CC a and CC B are TM configured with two TBs, according to the HARQ process ID in the DCI format, for the two TBs, the NDI value of the previous data transmission of CC a and the NDI value of the current DCI are respectively compared, and it is determined that the currently scheduled data is new data or retransmitted. If the NDI values of both TBs change, both TBs are considered new data for this HARQ process ID of CC a. At this time, CC a and CC B are further required to be identical, otherwise it may be considered an error condition. If the NDI values of both TBs are not changed, both TBs are considered to be retransmissions of this HARQ process ID for CC a. If the NDI of only one TB is unchanged, there are two possible approaches. The first is to consider the TB with unchanged corresponding NDI as the data retransmission of this HARQ process ID corresponding to CC a; and for another TB, new data corresponding to CC a, which is identified using CC indication information of the corresponding CC a although the initial transmission of the new data is performed on CC B. The second method is that the TB with unchanged corresponding NDI is considered as the data retransmission of the HARQ process ID corresponding to CC a; and for another TB, the data transmission corresponding to the HARQ process ID of CC B is performed, that is, according to the HARQ process ID in the DCI format, the NDI value of the previous data transmission of the TB of CCB and the NDI value of the current DCI are compared, and it is determined that it is new data or retransmission of the TB corresponding to CC B, where if the NDI value of another TB cannot match the HARQ transmission requirement of the TB of CC B, the TB may be disabled.

Assuming that CC a configures TM for one TB and CC B configures TM for two TBs, CC B cannot send CC a's new data because CC a must be different from CCB. The corresponding processing method is described below.

The first method is to restrict the data channel of CC B to schedule data of only one TB. For normal DCI, only one of the TBs may be scheduled, and the TB of CC a is mapped to this TB; while the other TB is disabled. TB1 may be fixedly considered available; alternatively, TB 2 may be fixedly considered available; or, it may also be determined which TB is available according to the control information of two TBs in the normal DCI, for example, the information combination of MCS and RV, that is, the combination of MCS and RV of only one TB is restricted to indicate that this TB is available; or, it is indicated which TB is available through higher layer signaling or other information in the DCI format, and accordingly, the UE determines the TB allowed to be scheduled in the CC B according to the indication information. Or, the NDI of the previous transmission of the TB of CC a and the NDI of the current DCI are compared, respectively, and if the NDI of only one TB is constant, the TB with constant NDI is transmitted on CC B. In addition, for the regression DCI, scheduling of only one TB is supported, and the TB of CC a is mapped to this TB. And comparing the NDI value of the previous data transmission of the CC A with the NDI value of the current DCI according to the HARQ process ID in the DCI format. If the value of NDI changes, an error condition may be considered. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a.

The second method is on a data channel to CC B, where one TB transmits data for CCA and the other TB is used for CC B data transmission. For normal DCI, it may be fixed that the TB of CC a is a TB1 mapped to the data channel scheduled by CC B; alternatively, the TB of CC a may be fixedly considered as TB 2 mapped to the data channel scheduled by CC B; or, the TB of CC a is indicated to which TB of the data channel scheduled on CC B is mapped through higher layer signaling or other information in the DCI format, and accordingly, the UE determines the TB of CC B that is allowed to be scheduled according to the indication information. In addition, for the regression DCI, scheduling of only one TB is supported, and the TB of CC a is mapped to this TB. And comparing the NDI value of the previous data transmission of the CC A with the NDI value of the current DCI according to the HARQ process ID in the DCI format corresponding to the TB mapped with the CC A data. If the value of NDI changes, an error condition may be considered. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a. And for the TB of the data without mapping the CCA, comparing the NDI value of the previous data transmission of the TB of the CC B with the NDI value of the current DCI according to the HARQ process ID in the DCI format, and judging that the TB is new data or retransmission of the TB corresponding to the CC B. Here, mapping the TB of CC a to TB 2 of the data channel of CC B is advantageous because the TB scheduled with the recursive DCI on CC B is TB1, and in this way, it is possible to support transmission of the TB of CC a on TB 2 and retransmission of the TB1 of CC B on TB1 at the same time on one subframe of CC B.

Assuming that CC a configures TM for two TBs and CC B configures TM for one TB, CC B cannot send CC a new data because CC a must be different from CCB. The corresponding processing method is described below. Since CC B has only one TB transmission capability, it can be fixedly considered that only TB1 of CC a can be transmitted on CC B. Alternatively, it is fixed that only TB 2 of CC a can be transmitted on CC B. Alternatively, the TB index of the currently transmitted CC a is obtained according to some other information, for example, if the index of one kind of information is k, the TB index of the currently transmitted CC a may be mod (k,2) + 1. The above information for indicating the TB index of the currently transmitted CC a may be one or more of an index of a PDCCH/EPDCCH channel in a search space of the UE, a subframe index, a CC index, and a starting PRB index of an allocated data channel. Or, which TB of the CC a is transmitted in the CC B is indicated by higher layer signaling or other information in the DCI, and accordingly, the UE determines which TB of the CCA the transmitted data is (i.e., the TB indicated by the indication information) according to the indication information. Alternatively, the NDI field in the DCI format directly indicates the currently retransmitted TB, e.g., NDI equal to 0 indicates retransmission for TB1 of CC a, and NDI equal to 1 indicates retransmission for TB 2 of CC a. Or, the NDI of the previous transmission of the two TBs of the CC a is compared with the NDI of the current DCI, and if the NDI of only one TB is unchanged, the TB with unchanged NDI is transmitted on the CC B; further, if the NDIs of the two TBs are both unchanged or both changed, only TB1 of CC a can be transmitted on CC B, or only TB 2 of CC a can be transmitted on CC B, or which TB of CC a is transmitted on CC B is indicated by higher layer signaling or other information in DCI, and accordingly, the UE determines which TB of CC a the transmitted data is (i.e., the TB indicated by the indication information) according to the indication information. And comparing the NDI value of the previous data transmission of the CC A with the NDI value of the current DCI according to the HARQ process ID in the DCI format corresponding to the TB mapped with the CC A data. If the value of NDI changes, an error condition may be considered. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a. Here, an advantage of allowing the TBs of CC a mapped to CC B transmissions to vary is to avoid that one of the TBs of the CCA cannot get retransmitted for a long time. For example, assuming that only TB1 of CC a can be mapped to CC B transmission, when TB 2 of CC a's previous transmission is not correct, TB 2 of CC a cannot be retransmitted on CC B, and at the same time, cannot occupy the channel for a long time on CC supporting TM of 2 TBs, which results in that TB 2 of CC a cannot be retransmitted for a long time, which reduces the performance of HARQ operation.

EXAMPLE III

For the UE working in the CA mode, N carriers are configured for the UE through RRC signaling. However, because of channel occupation and base station scheduling, one carrier of the unlicensed band can only be actually used for data transmission for a part of time, and the more devices participating in contention, the smaller the proportion of time that one device can contend for the channel. The amount of data that the UE can transmit over a period of time is reduced from the average effect on the UE side. Therefore, for one carrier, it may not be necessary to design the cross-carrier HARQ process such that data may be transmitted all the time.

From the UE side, the N carriers may be equivalent to configuring M virtual carriers (VCCs), and the time ratio actually allocated to the UE by the M VCCs is large. M is less than or equal to N. Here, the data transmitted on the N carriers configuring the UE may be considered as initial transmission or HARQ retransmission of data corresponding to the M VCCs. In this way, the behavior of the UE can be handled based on VCC. That is, when performing cross-carrier HARQ transmission, for one data, the CC in which the physical channels for initial transmission and retransmission are located may be different, but the initial transmission and retransmission for this data are identified by using the same VCC. Here, one HARQ process is jointly identified by the VCC index and the HARQ process ID. For example, downlink data transmission is performed, data with the same VCC is allowed to be transmitted on PDSCHs of different CCs, and when receiving the downlink data, the UE may perform HARQ combining on initial transmission and retransmission of the data with the same HARQ process ID and the same VCC.

In order to support cross-carrier HARQ transmission, it is necessary to indicate to which VCC the currently scheduled data corresponds. A first method for indicating the VCC index is to indicate the VCC index in Downlink Control Information (DCI) for scheduling data transmission, for example, add an additional VCC index information field, or reuse an existing information field to indicate VCC index information, thereby indicating to which VCC the data transmission in one subframe actually corresponds. The second method for indicating VCC index sends indication information of one VCC index and applies the indication information to a plurality of consecutive subframes of one carrier, for example, for a cell of an unlicensed frequency band, when sending the channel occupancy indication information of the cell, it indicates which VCC corresponds to data transmission on all subframes occupied by the channel this time. The indication information may still be transmitted through downlink control information, for example, one DCI format in a Common Search Space (CSS) is used to transmit the channel occupancy indication information and the VCC information applied to consecutive subframes, and the number of bits of the DCI format is equal to that of DCI format 1A or 1C, so that the number of blind detections in the DCI format is not increased.

When N CCs of the UE are configured and cross-carrier HARQ transmission of data for one VCC can be performed on any CC, each VCC must be assigned a unique VCC index. When N CCs configuring a UE are divided into a plurality of groups and cross-carrier HARQ transmission is limited to be performed separately within each group, each VCC must be assigned a unique VCC index within one group, but VCC indexes of different groups may be the same or different. For downlink data transmission, for example, for self-scheduling (self scheduling) on one CC, the scheduled downlink data occupies the PDSCH of the CC for transmission, that is, data corresponding to VCC is transmitted on the PDSCH of the CC. For cross-carrier scheduling, the scheduled downlink data is transmitted on the PDSCH of the CC indicated by the CIF domain, that is, the data corresponding to the VCC is transmitted on the PDSCH of the CC indicated by the CIF domain.

In the LTE system, each configured CC may configure its Transmission Mode (TM) accordingly. For the above method for processing UE according to VCC, it is necessary to know the TM of each VCC, that is, the number of TBs that can be simultaneously transmitted by VCC in one subframe is 1 or 2. The first processing method is to use high-level signaling to configure the number of TBs that can be simultaneously transmitted in one subframe for each VCC. The second processing method is to configure the number of TBs that can be carried on one subframe by using a high-level signaling, and apply to all VCCs. A third method is to predefine the number of TBs that each VCC can simultaneously transmit in one subframe, e.g., it is fixed that each VCC can have 2 TBs in one subframe. The fourth method is to indicate whether the configuration information of one CC is used for mapping the configuration information of one VCC when configuring each CC of the N CCs of the UE. For the CC mapped with VCC, the TM of VCC corresponding to the CC can be obtained according to the TM of the CC. The fifth method is to directly configure the number M of the VCCs of the UE by using a higher layer signaling, and consider that the TM of the first M CCs among the N CCs configuring the UE sequentially face the TM of the M VCCs. According to the TM of the group of CCs, as long as one CC configures a TM supporting 2 TBs, the number of TBs that each VCC of the group of CCs can carry on a subframe is considered to be 2; otherwise, it is assumed that the number of TBs that each VCC of the set of CCs can carry on one subframe of one CC is 1. A seventh method is to configure a value X, for example, to make the number of TBs that the first X VCCs can bear on a subframe be 2; the number of TBs that other M-X VCCs can carry on one subframe is 1, and M is the total number of VCCs.

Here, data of VCC corresponding to TM configured with a single TB can be transmitted only by mapping to CC of TM supporting a single TB, and data of VCC corresponding to TM configured with a dual TB can be transmitted only by mapping to CC of TM supporting a dual TB. Or, the data of the VCC corresponding to TM configured with single TB can be transmitted only by mapping to CC of TM supporting single TB, while the data of the VCC corresponding to TM configured with dual TB is allowed to be transmitted by mapping to any CC. Or, the data of the VCC corresponding to TM configured with single TB is allowed to be transmitted by mapping to any CC, while the data of the VCC corresponding to TM configured with dual TB can be transmitted by mapping only to the CC of TM supporting dual TB. Alternatively, data corresponding to any VCC may be mapped to any CC for transmission.

For one data transmission, the method of the present invention is described below according to VCC and CC B where the scheduled data channel is located, respectively.

Assuming that both VCC and CC B are configured with a TM of one TB, according to the HARQ process ID in the DCI format, the NDI value of the previous data transmission of VCC and the NDI value of the current DCI are compared, and it is determined that the currently scheduled data is new data or retransmitted. If the value of NDI changes, it is considered as a new data of this HARQ process ID corresponding to VCC. If the value of NDI is not changed, it is considered as a data retransmission of this HARQ process ID corresponding to VCC.

Assuming that VCC and CC B are both TM configured with two TBs, according to HARQ process ID in DCI format, for two TBs, NDI value of previous data transmission of VCC and NDI value of current DCI are compared respectively, and it is determined that currently scheduled data is new data or retransmitted. If the NDI values of both TBs change, both TBs are considered new data for this HARQ process ID for VCC. If the NDI values of both TBs are not changed, both TBs are considered to be retransmissions of this HARQ process ID for VCC. If only one TB has an unchanged NDI, the TB with the unchanged NDI is a data retransmission of this HARQ process ID of VCC, and another TB is new data of this HARQ process ID of VCC.

Assuming that VCC configures TM of one TB and CC B configures TM of two TBs, the corresponding processing method is described below. The data channel of CC B may be restricted to schedule data for only one TB. For normal DCI, only one of the TBs may be scheduled, and the TB of the VCC is mapped to this TB; while the other TB is disabled. TB1 may be fixedly considered available; alternatively, TB 2 may be fixedly considered available; or, it may also be determined which TB is available according to the control information of two TBs in the normal DCI, for example, the information combination of MCS and RV, that is, the combination of MCS and RV of only one TB is restricted to indicate that this TB is available; or, it is indicated which TB is available through higher layer signaling or other information in the DCI format, and accordingly, the UE determines the TB allowed to be scheduled in the CC B according to the indication information. In addition, for the regression DCI, scheduling of only one TB is supported, and the TB of the VCC is mapped to this TB. And comparing the NDI value of the previous data transmission of the VCC with the NDI value of the current DCI according to the HARQ process ID in the DCI format, and judging whether the currently scheduled data is new data or retransmission. If the value of NDI changes, it is considered as a new data of this HARQ process ID corresponding to VCC. If the value of NDI is not changed, it is considered as a data retransmission of this HARQ process ID corresponding to VCC.

Assuming that VCC configures two TBs of TM and CC B configures one TB of TM, the corresponding processing method is described below. Since CC B has only one TB transmission capability, it can be fixed that only TB1 of VCC can be transmitted on CC B. Alternatively, only TB 2 of VCC can be fixedly considered for transmission on CC B. Alternatively, the TB index of the currently transmitted VCC is obtained according to some other information, for example, if the index of one kind of information is k, the TB index of the currently transmitted VCC may be mod (k,2) + 1. The above information for indicating the TB index of the currently transmitted VCC may be one or more of an index of a PDCCH/EPDCCH channel in a search space of the UE, a subframe index, a VCC index, a CC index, and a starting PRB index of an allocated data channel. Or, which TB of the VCC is transmitted in the CC B is indicated by higher layer signaling or other information in the DCI, and accordingly, the UE determines which TB of the VCC the transmitted data is (i.e., the TB indicated by the indication information) according to the indication information. Or, comparing the NDI of the previous transmission of the two TBs of the VCC with the NDI of the current DCI, if the NDI of only one TB is unchanged, the TB with unchanged NDI is transmitted on the CC B; if the NDI of both TBs is unchanged or changed, only TB1 of VCC can be transmitted on CC B; alternatively, only TB 2 of VCC can be transmitted on CC B; or, which TB of the VCC is transmitted in the CC B is indicated by higher layer signaling or other information in the DCI, and accordingly, the UE determines which TB of the VCC the transmitted data is (i.e., the TB indicated by the indication information) according to the indication information. And corresponding to the mapped TB, comparing the NDI value transmitted by the previous data of the VCC with the NDI value of the current DCI according to the HARQ process ID in the DCI format, and judging whether the currently scheduled data is new data or retransmitted. If the value of NDI changes, it is considered as a new data for this HARQ process ID of CC a. If the value of NDI is not changed, it is considered as a data retransmission for this HARQ process ID of CC a. Here, an advantage of allowing the TBs mapped to CC B transmissions of VCC to vary is to avoid that one of the TBs of VCC cannot get retransmitted for a long time. For example, assuming that only TB1 of VCC can be mapped to CC B transmission, when TB 2 of VCC transmitted last time is incorrect, TB 2 of VCC cannot be retransmitted on CC B, and meanwhile, assuming that other CCs supporting TM of 2 TBs cannot occupy the channel for a long time, this results in TB 2 of VCC not being retransmitted for a long time, which reduces performance of HARQ operation.

Example four

For the UE working in the CA mode, N carriers are configured for the UE through RRC signaling. However, because of channel occupation and base station scheduling, one carrier of the unlicensed band can only be actually used for data transmission for a part of time, and the more devices participating in contention, the smaller the proportion of time that one device can contend for the channel. From the average effect on the UE side, the amount of data that the UE can transmit over a period of time is small. Therefore, for one carrier, it may not be necessary to design the cross-carrier HARQ process such that data may be transmitted all the time.

In order to support cross-carrier HARQ transmission and retransmission, a joint HARQ process may be defined, and for one data, the CC where the physical channels for initial transmission and retransmission are located may be different, but the same joint HARQ process is used for initial transmission and retransmission of the data to identify. Thus, when scheduling data, a joint HARQ process ID is transmitted in the DCI format to identify the joint HARQ process corresponding to the currently scheduled data. Taking downlink data transmission as an example, corresponding to the joint HARQ process, HARQ initial transmission and retransmission for the same data are not limited to one CC any more, but can be mapped to different CCs; when receiving downlink data, the UE may perform HARQ combining on the initial transmission and the retransmission of data with the same joint HARQ process ID. Here, when supporting cross-carrier HARQ, the total number of the joint HARQ processes needs to be equal to or less than the sum of the maximum HARQ process numbers individually calculated by the respective CCs. In this way, the total number of joint HARQ processes that one UE needs to transmit can be configured with higher layer signaling, and the UE behavior can be handled based on the joint HARQ processes. In order to support cross-carrier HARQ transmission and retransmission, an information field may be added to the DCI format, or an existing information field in the DCI may be reused to transmit a joint HARQ process ID corresponding to currently scheduled data.

When N CCs of the UE are configured and cross-carrier HARQ transmission of data for one joint HARQ process ID can be performed on any CC, each joint HARQ process must be assigned a unique joint HARQ process ID. When N CCs configuring a UE are divided into a plurality of groups and cross-carrier HARQ transmission is limited to be performed separately within each group, a unique joint HARQ process ID must be allocated to each joint HARQ process within one group, but the IDs of the joint HARQ processes of different groups may be the same or different. For downlink data transmission, for example, for self scheduling (self scheduling) on one CC, the scheduled downlink data occupies the PDSCH of the CC for transmission, that is, data corresponding to the joint HARQ process ID is transmitted on the PDSCH of the CC. For cross-carrier scheduling, the scheduled downlink data is transmitted on the PDSCH of the CC indicated by the CIF field, that is, the data corresponding to the joint HARQ process ID is transmitted on the PDSCH of the CC indicated by the CIF field.

For the above method for processing UE behavior according to the joint HARQ process, the number of TBs that each joint HARQ process can bear on one subframe of one CC, that is, 1 TB or 2 TBs, needs to be further indicated. The first method is to configure the number of TBs that can be carried on one subframe of one CC represented by each joint HARQ process ID separately by using higher layer signaling. The second method is to configure the number of TBs that can be carried on one subframe of one CC with higher layer signaling, and apply to all joint HARQ processes. A third method is to predefine the number of TBs that all joint HARQ processes can carry on one subframe of one CC to a specific value, for example, 2 TBs, thereby indicating the MIMO transmission mode. The fourth method is that according to the TM of the group of CCs, as long as one CC configures the TM supporting 2 TBs, it is considered that the number of TBs that each joint HARQ process can carry on one subframe of one CC is 2; otherwise, the number of TBs that can be carried on one subframe of one CC per joint HARQ process is considered to be 1. A fifth method is to configure a value X, for example, to make the number of TBs that can be carried by the first X joint HARQ processes on a subframe of a CC be 2; the number of TBs that other Mg-X joint HARQ processes can bear on one subframe of one CC is 1, and Mg is the total number of joint HARQ processes configuring the UE. The sixth method is to determine the number of TBs that can be carried on a subframe of a CC corresponding to a current HARQ process ID according to the transmission mode of a physical CC occupied by the latest initial transmission of the HARQ process ID.

Here, data corresponding to the joint HARQ process ID configuring the single TB can be transmitted only by mapping to the CC of the TM supporting the single TB, and data corresponding to the joint HARQ process ID configuring the dual TB can be transmitted only by mapping to the CC of the TM supporting the dual TB. Or, the data corresponding to the joint HARQ process ID configuring the single TB can be transmitted only by mapping to the CC of the TM supporting the single TB, while the data corresponding to the joint HARQ process ID configuring the dual TB is allowed to be transmitted by mapping to any one CC. Or, the data corresponding to the joint HARQ process ID configuring the single TB is allowed to be mapped to any CC for transmission, and the data corresponding to the joint HARQ process ID configuring the dual TB can be only mapped to the CC of the TM supporting the dual TB for transmission. Alternatively, data corresponding to any one of the joint HARQ process IDs may be mapped to any one of the CCs for transmission.

For one data transmission, the method of the present invention is described below according to the joint HARQ process and the CC B where the scheduling data channel is located, respectively.

Assuming that both the joint HARQ process and CC B are configured with a TB TM, the NDI value of the previous data transmission is compared with the NDI value of the current DCI according to the joint HARQ process ID in the DCI format, and it is determined whether the currently scheduled data is new data or retransmitted. If the NDI value changes, it is considered as a new data corresponding to the joint HARQ process ID. If the value of NDI is not changed, it is considered as a data retransmission corresponding to this joint HARQ process ID.

Assuming that the joint HARQ process and CC B are both TM configured with two TBs, for the two TBs, the NDI value of the previous data transmission of the joint HARQ process and the NDI value of the current DCI are respectively compared according to the HARQ process ID in the DCI format, and it is determined that the currently scheduled data is new data or retransmitted. If the NDI values of both TBs change, both TBs are considered new data corresponding to this joint HARQ process ID. If the NDI values of both TBs are not changed, both TBs are considered to be retransmissions corresponding to this joint HARQ process ID. If only one TB has an unchanged NDI, the TB with the unchanged NDI is a data retransmission of the HARQ process ID of the joint HARQ process ID, and another TB is new data of the joint HARQ process ID.

Assuming that the joint HARQ process configures TM of one TB and CC B configures TM of two TBs, the corresponding processing method is described below. The data channel of CC B may be restricted to schedule data for only one TB. For normal DCI, only one of the TBs may be scheduled, and the TB of the joint HARQ process is mapped to this TB; while the other TB is disabled. TB1 may be fixedly considered available; alternatively, TB 2 may be fixedly considered available; or, it may also be determined which TB is available according to the control information of two TBs in the normal DCI, for example, the information combination of MCS and RV, that is, the combination of MCS and RV of only one TB is restricted to indicate that this TB is available; or, it is indicated which TB is available through higher layer signaling or other information in the DCI format, and accordingly, the UE determines the TB allowed to be scheduled in the CC B according to the indication information. In addition, for the regression DCI, only one TB is supported to be scheduled, and the TB of the joint HARQ process is mapped to this TB. And comparing the NDI value of the previous data transmission with the NDI value of the current DCI according to the combined HARQ process ID in the DCI format, and judging whether the currently scheduled data is new data or retransmission. If the NDI value changes, it is considered as a new data corresponding to the joint HARQ process ID. If the value of NDI is not changed, it is considered as a data retransmission corresponding to this joint HARQ process ID.

Assuming that the joint HARQ process configures TM of two TBs and CC B configures TM of one TB, the corresponding processing method is described below. Since CC B has only one TB transmission capability, it can be fixedly considered that only TB1 of the joint HARQ process can be transmitted on CC B. Alternatively, only TB 2 of the joint HARQ process can be fixedly considered to be transmitted on CC B. Alternatively, the TB index of the currently transmitted joint HARQ process is obtained according to some other information, for example, if the index of one kind of information is k, the TB index of the currently transmitted joint HARQ process may be mod (k,2) + 1. The above information for indicating the TB index of the currently transmitted joint HARQ process may be one or more of an index of a PDCCH/EPDCCH channel in a search space of the UE, a subframe index, a joint HARQ process ID, a CC index, and a starting PRB index of an allocated data channel. Or, which TB of the joint HARQ process is transmitted in the CC B is indicated by higher layer signaling or other information in the DCI, and accordingly, the UE determines which TB of the joint HARQ process the transmitted data is according to the indication information (i.e. the TB indicated by the indication information). Or, the NDI of the previous transmission of two TBs in the joint HARQ process is compared with the NDI in the current DCI, and if the NDI of only one TB is unchanged, the TB with unchanged NDI is transmitted on the CC B; if the NDIs of both TBs are not changed or are changed, only TB1 of the joint HARQ process can be transmitted on CC B; or, which TB of the joint HARQ process is transmitted in the CC B is indicated by higher layer signaling or other information in the DCI, and accordingly, the UE determines which TB of the joint HARQ process the transmitted data is according to the indication information (i.e. the TB indicated by the indication information). And comparing the NDI value of the previous data transmission with the NDI value of the current DCI according to the combined HARQ process ID in the DCI format corresponding to the mapped TB, and judging whether the currently scheduled data is new data or retransmission. If the NDI value changes, it is considered as a new data corresponding to the joint HARQ process ID. If the value of NDI is not changed, it is considered as a data retransmission corresponding to this joint HARQ process ID. Here, an advantage of allowing the TBs mapped to CC B transmission of one joint HARQ process to be changed is to avoid that one of the TBs of this joint HARQ process cannot be retransmitted for a long time. For example, assuming that only TB1 of the joint HARQ process can be mapped to CC B transmission, when TB 2 of the previous transmission of the joint HARQ process is incorrect, TB 2 of the joint HARQ process cannot be retransmitted on CC B, and meanwhile, assuming that other CCs supporting TM of 2 TBs cannot occupy the channel for a long time, TB 2 of the joint HARQ process cannot be retransmitted for a long time, which reduces the performance of HARQ operation.

The foregoing is a specific implementation of the HARQ transmission method in the present application. The application also provides a device for HARQ transmission, which can be used for implementing the HARQ transmission method. Fig. 2 is a schematic diagram of a basic structure of the apparatus, and as shown in fig. 4, the apparatus includes: a configuration receiving unit, a scheduling unit and a data transmitting/receiving unit.

The configuration receiving unit is used for receiving configuration information of the base station about cross-HARQ transmission. And the scheduling unit is used for receiving the downlink control information sent by the base station and determining a data channel scheduled by the downlink control information. And the data sending/receiving unit is used for sending uplink data or receiving downlink data on the data channel determined by the scheduling unit according to the configuration information.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method of hybrid automatic repeat request, HARQ, transmission, comprising:

the UE receives CC indication information or virtual carrier VCC information or a combined HARQ process ID;

the UE receives downlink control information sent by a base station and correspondingly receives downlink data or sends uplink data on a data channel scheduled by the UE according to the configuration information; wherein, the data channels of the initial transmission and retransmission of the same scheduling data are allowed to be positioned in different Cell Carriers (CC);

wherein the transmission of the uplink data or the downlink data comprises: carrying out HARQ combination on the data of the same HARQ process ID with the same CC indication information and the retransmission thereof, or carrying out HARQ combination on the data of the same HARQ process ID with the same VCC information and the retransmission thereof, or carrying out HARQ combination on the data of the same combined HARQ process ID and the retransmission thereof; the CC indication information is used for identifying the CC of the current scheduling data, the VCC information is used for indicating the VCC corresponding to the current data, and the combined HARQ process ID is used for indicating the combined HARQ process corresponding to the current data.

2. The method of claim 1, wherein data with the same CC indication information is allowed to be transmitted on data channels of different CCs; one HARQ process is jointly identified through CC indication information and HARQ process ID.

3. The method of claim 2, wherein the CC indication information is an index of one CC in all CCs configured for the UE;

4. The method of claim 2, wherein when the CC indicated by the CC indication information adopts a Transmission Mode (TM) configured with one Transport Block (TB) and the CC where the scheduled data channel is located adopts a TM configured with two TBs, the manner of transmitting data on the scheduled data channel comprises:

5. The method of claim 2, wherein when the CC indicated by the CC indication information adopts a TM configured with two TBs and the CC where the scheduled data channel is located adopts a TM configured with one TB, the manner of transmitting data on the scheduled data channel comprises:

6. The method according to claim 2, 4 or 5, wherein the CC indicated by the CC indication information is a CC occupied by a physical channel for initial transmission or retransmission of the identified data, or wherein the CC indicated by the CC indication information is any one of CCs configured to the UE.

7. The method according to claim 2, 4 or 5, wherein if the currently scheduled data is new data, the index of the CC indicated by the CC indication information in the downlink control information is consistent with the index of the CC where the scheduled data channel is located;

8. The method of claim 6, wherein the CC indication information is carried in a new definition or an existing information field in a DCI format in downlink control information; or, the CC indication information is carried by one DCI format in a common search space, and the CC indication information is valid for a plurality of consecutive subframes.

9. The method of claim 7, wherein the CC indication information is carried in a new definition or an existing information field in a DCI format in downlink control information; or, the CC indication information is carried by one DCI format in a common search space, and the CC indication information is valid for a plurality of consecutive subframes.

10. The method of claim 7, wherein when the CC indicated by the CC indication information and the CC on which the scheduled data channel is located both adopt TMs configured with two TBs,

11. The method of claim 7, wherein when the CC indicated by the CC indication information adopts a Transmission Mode (TM) with one Transport Block (TB) and the CC where the currently scheduled data channel is located adopts a TM with two TBs, the manner of transmitting data on the currently scheduled data channel comprises:

12. The method of claim 1, wherein data of the same VCC is allowed to be transmitted on PDSCH of different CCs; one HARQ process is jointly identified by VCC index and HARQ process ID.

13. The method of claim 12, wherein the VCC information is carried in a custom or existing information field in a DCI format in downlink control information; or, the VCC information is carried by a DCI format in a common search space, and the CC indication information is valid for a plurality of consecutive subframes.

14. The method of claim 12, wherein the index information of each VCC allocated to the UE is different;

15. The method of claim 12, wherein configuring the transmission mode for each VCC configured for the UE comprises:

16. The method of claim 12, wherein transmitting data on the scheduled data channel comprises:

17. The method of claim 12, wherein when the VCC employs a TM configured with one TB and a CC where the scheduled data channel is located employs a TM configured with two TBs, the scheduled data channel is restricted to schedule data of only one TB, and the TB of the VCC is mapped to the TB allowed to be scheduled; wherein, for normal DCI, the manner of determining that the TB is allowed to be scheduled in the scheduled data channel is:

18. The method of claim 12, wherein when the VCC employs a TM configured with two TBs and the CC on which the scheduled data channel is located employs a TM configured with one TB, the manner of transmitting data on the scheduled data channel comprises:

19. The method of claim 1, wherein data of the same joint HARQ process is allowed to be transmitted on PDSCH of different CCs; and carrying out HARQ combination on the data of the same combined HARQ process ID and the retransmission thereof.

20. The method of claim 19, wherein the joint HARQ process ID for each joint HARQ process is different;

21. The method of claim 19, wherein configuring the TM on one CC for each joint HARQ process of the UE comprises:

22. The method of claim 19, wherein transmitting data on the scheduled data channel comprises:

23. The method of claim 19, wherein when the joint HARQ process uses TM configured with one TB and the CC where the scheduled data channel is located uses TM configured with two TBs, the scheduled data channel is restricted from scheduling data of only one TB, and the TB of the joint HARQ process is mapped to the TB allowed to be scheduled; wherein, for normal DCI, the manner of determining that the TB is allowed to be scheduled in the scheduled data channel is:

24. The method of claim 19, wherein when the joint HARQ process employs a TM configured with two TBs and a TM configured with one TB is located in a CC where the scheduled data channel is located, the manner of transmitting data on the scheduled data channel comprises:

25. A user equipment for hybrid automatic repeat request, HARQ, transmission, comprising: configuring a receiving unit, a scheduling unit and a data transmitting/receiving unit;

the configuration receiving unit is configured to receive configuration information of the base station regarding cross-HARQ transmission, and is further configured to receive CC indication information or virtual carrier VCC information or a joint HARQ process ID;

the data sending/receiving unit is configured to receive downlink data or send uplink data according to the configuration information on the data channel determined by the scheduling unit; wherein, the data channels of the initial transmission and retransmission of the same scheduling data are allowed to be positioned in different Cell Carriers (CC);

26. The apparatus of claim 25, wherein data with the same CC indication information is allowed to be transmitted on data channels of different CCs; one HARQ process is jointly identified through CC indication information and HARQ process ID.

27. The apparatus of claim 26, wherein the CC indication information is an index of one CC in all CCs configured to the UE;

28. The apparatus of claim 26, wherein when the CC indicated by the CC indication information adopts a transmission mode TM configured with one transport block TB and the CC where the scheduled data channel is located adopts a TM configured with two TBs, the manner for the data sending/receiving unit to transmit data on the data channel determined by the scheduling unit comprises:

limiting the data channel determined by the scheduling unit to schedule data of only one TB; for normal DCI, the manner of determining the TB allowed to be scheduled is as follows: taking a fixed one of the two TBs as a scheduling-allowed TB, or determining the scheduling-allowed TB according to the control information of the two TBs in the DCI;

or, one of the TBs transmitted on the data channel determined by the scheduling unit is data of a CC indicated by the CC indication information, and the other TB transmitted is data of a CC where the scheduled data channel is located; wherein, the one TB is a pre-designated fixed TB, or a TB indicated by information in a high layer signaling or DCI.

29. The apparatus of claim 26, wherein when the CC indicated by the CC indication information adopts a TM configured with two TBs and the CC where the scheduled data channel is located adopts a TM configured with one TB, the manner for the data sending/receiving unit to transmit data on the data channel determined by the scheduling unit includes:

the data transmitted on the data channel determined by the scheduling unit is a fixed TB on the CC indicated by the CC indication information or a TB designated by specific information;

or, the data transmitted on the data channel determined by the scheduling unit is one TB in the CC indicated by the CC indication information indicated by the NDI field of the DCI format;

or, the NDI of the previous transmission of two TBs of the CC indicated by the CC indication information is compared with the NDI of the current DCI, and if the NDI of only one TB is unchanged, it is determined that the data transmitted on the data channel determined by the scheduling unit is the TB with the unchanged NDI; otherwise, determining that the data transmitted on the data channel determined by the scheduling unit is a fixed TB of the CC indicated by the CC indication information, or determining that the data transmitted on the data channel determined by the scheduling unit is a TB indicated by the information in the CC indicated by the CC indication information according to a high-level signaling or an information indication in DCI.

30. The apparatus according to claim 26, 28 or 29, wherein the CC indicated by the CC indication information is a CC occupied by a physical channel for initial transmission or retransmission of data identified by the CC indication information, or wherein the CC indicated by the CC indication information is any one of CCs configured to the UE.

31. The apparatus according to claim 26, 28 or 29, wherein if the currently scheduled data is new data, the index of the CC indicated by the CC indication information in the downlink control information is consistent with the index of the CC where the scheduled data channel is located;

32. The apparatus of claim 30, wherein the CC indication information is carried in a new definition or an existing information field in a DCI format in downlink control information; or, the CC indication information is carried by one DCI format in a common search space, and the CC indication information is valid for a plurality of consecutive subframes.

33. The apparatus of claim 31, wherein the CC indication information is carried in a new definition or an existing information field in a DCI format in downlink control information; or, the CC indication information is carried by one DCI format in a common search space, and the CC indication information is valid for a plurality of consecutive subframes.

34. The apparatus of claim 31, wherein when the CC indicated by the CC indication information and the CC on which the data channel is located determined by the scheduling unit both adopt TMs configured with two TBs,

respectively comparing the NDI of the previous transmission of the two TBs of the CC indicated by the CC indication information with the NDI of the current DCI, and if only one of the NDI values of the two TBs changes and the other does not change, the manner in which the data transmitting/receiving unit transmits data on the data channel determined by the scheduling unit includes: corresponding to a TB with an unchanged NDI, the data transmitted on the data channel determined by the scheduling unit is the data retransmission of the CC indicated by the CC indication information; corresponding to another TB, the data transmitted on the data channel determined by the scheduling unit is new data of the CC indicated by the CC indication information;

or, corresponding to a TB with an unchanged NDI, the data transmitted on the data channel determined by the scheduling unit is the data retransmission of the CC indicated by the CC indication information; and corresponding to another TB, comparing the NDI value of the previous data transmission of the corresponding TB of the CC where the data channel is located and determined by the scheduling unit with the NDI value of the current DCI according to the HARQ process ID in the DCI format, and determining that the transmission data is new data or retransmission data of the corresponding TB of the CC where the data channel is located and determined by the scheduling unit.

35. The apparatus of claim 31, wherein when the CC indicated by the CC indication information adopts a transmission mode TM configured with one transport block TB and the CC where the currently scheduled data channel is located adopts a TM configured with two TBs, the data sending/receiving unit transmits data on the currently scheduled data channel by:

36. The apparatus of claim 25, wherein data of the same VCC is allowed to be transmitted on PDSCH of different CCs; one HARQ process is jointly identified by VCC index and HARQ process ID.

37. The apparatus of claim 36, wherein the VCC information is carried via a custom or existing information field in a DCI format in downlink control information; or, the VCC information is carried by a DCI format in a common search space, and the CC indication information is valid for a plurality of consecutive subframes.

38. The apparatus of claim 36, wherein index information of each VCC assigned to the UE is different;

39. The apparatus of claim 36, wherein the means for configuring the transmission mode for each VCC configured for the UE comprises:

40. The apparatus of claim 36, wherein the manner in which the data sending/receiving unit transmits data on the data channel determined by the scheduling unit comprises:

41. The apparatus according to claim 36, wherein when the VCC employs a TM configured with one TB and a CC on which the data channel determined by the scheduling unit is located employs a TM configured with two TBs, the data channel determined by the scheduling unit is restricted to schedule data of only one TB, and the TB of the VCC is mapped to the TB allowed to be scheduled; for normal DCI, the manner for determining that the TB is allowed to be scheduled in the data channel determined by the scheduling unit is:

the scheduling unit determines that a fixed TB of the CC where the data channel is located allows scheduling;

42. The apparatus of claim 36, wherein when the VCC employs a TM configured with two TBs and the CC on which the data channel determined by the scheduling unit is located employs a TM configured with one TB, the manner for the data sending/receiving unit to transmit data on the data channel determined by the scheduling unit includes:

the data transmitted on the data channel determined by the scheduling unit is a fixed TB in the VCC or a TB designated by specific information;

or, according to a high-level signaling or an information indication in the DCI, determining that data transmitted on the data channel determined by the scheduling unit is an indicated TB of the VCC;

or, respectively comparing the NDI of the previous transmission of the two TBs of the VCC with the NDI of the current DCI, and if the NDI of only one TB is unchanged, determining that the data transmitted on the data channel determined by the scheduling unit is the TB with the unchanged NDI; otherwise, determining that the data transmitted on the data channel determined by the scheduling unit is a fixed TB of the VCC, or determining that the data transmitted on the data channel determined by the scheduling unit is an indicated TB of the VCC according to a high-level signaling or an information indication in DCI.

43. The apparatus of claim 25, wherein data of a same joint HARQ process is allowed to be transmitted on PDSCH of different CCs; and carrying out HARQ combination on the data of the same combined HARQ process ID and the retransmission thereof.

44. The apparatus of claim 43, wherein a joint HARQ process ID for each joint HARQ process is different;

45. The apparatus of claim 43, wherein the manner for configuring the TM on one CC for each joint HARQ process of the UE comprises:

46. The apparatus according to claim 43, wherein the manner of transmitting data on the data channel determined by the scheduling unit by the data sending/receiving unit comprises:

47. The apparatus of claim 43, wherein when the joint HARQ process uses a TM configured with one TB and the CC where the data channel is determined by the scheduling unit uses a TM configured with two TBs, the scheduled data channel is restricted to schedule data of only one TB, and the TB of the joint HARQ process is mapped to the TB that is allowed to be scheduled; for normal DCI, the manner for determining that the TB is allowed to be scheduled in the data channel determined by the scheduling unit is:

48. The apparatus of claim 43, wherein when the joint HARQ process employs a TM configured with two TBs and a TM configured with one TB is used in a CC where the data channel determined by the scheduling unit is located, the manner for the data sending/receiving unit to transmit data on the data channel determined by the scheduling unit comprises:

the data transmitted on the data channel determined by the scheduling unit is a fixed TB of the joint HARQ process or a TB designated by specific information;

or, according to a high-level signaling or an information indication in the DCI, determining that data transmitted on the data channel determined by the scheduling unit is an indicated TB of the joint HARQ process;

or, the NDI of the previous transmission of two TBs in the joint HARQ process and the NDI in the current DCI are respectively compared, and if the NDI of only one TB is unchanged, it is determined that the data transmitted on the data channel determined by the scheduling unit is the TB with the unchanged NDI; otherwise, determining that the data transmitted on the data channel determined by the scheduling unit is a fixed TB of the joint HARQ process, or determining that the data transmitted on the data channel determined by the scheduling unit is an indicated TB of the joint HARQ process according to a high-level signaling or an information indication in DCI.