KR20160079647A - A method and apparatus for hybrid automatic repeat request transmission - Google Patents

Abstract

Various embodiments of the present disclosure provide a cross-carrier HARQ transmission method. A user end (UE) receives setting information for cross-carrier HARQ transmission from a base station, receives downlink data based on the setting information and DCI or transmits uplink data. The method allows HARQ transmission of the same data through a plurality of component carriers (CC) which increases the efficiency of HARQ transmission and improves data transmission performance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hybrid automatic repeat request transmission method and apparatus,

The present disclosure relates to a method and apparatus for processing Hybrid Automatic Retransmission Request (HARQ) in a wireless communication system.

Third generation partnership projet (3GPP) Long Term Evolution (LTE) systems support both Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD). 1 is a schematic diagram showing an example of a general FDD radio frame.

 Referring to FIG. 1, in the FDD system, each radio frame has a length of 10 ms and includes 10 subframes. The length of each subframe is 1 ms. Each subframe consists of two consecutive time slots. That is, the kth subframe includes time slot 2k and time slot 2k + 1 (k = 0, 1, ..., 9). The length of each time slot is 0.5 ms long.

2 is a schematic diagram showing an example of a general TDD radio frame.

Referring to FIG. 2, the length of each radio frame in the TDD system is 10ms, and includes two 1/2 frames. The length of each half frame is 5 ms. Each of the 1/2 frames is divided into 8 slots and 3 special fields with a length of 0.5 ms, i.e., a downlink pilot time slot (DwPTS), a guard interval (GP) (UpPTS: Uplink Pilot Time Slot). The three special fields have a total length of 1 ms. Each subframe consists of two consecutive timeslots, i. E., The kth subframe includes timeslot 2k and timeslot 2k + 1 (k = 0, 1, ..., 9). One downlink transmission time interval (TTI) is defined as one subframe.

In the TDD radio frame, there are seven types of uplink / downlink (UL / DL) settings, as shown in Table 1 below. In Table 1 below, D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe including three special fields.

Setting serial number Switch point cycle Subframe ID 0 One 2 3 4 5 6 7 8 9 0 5 ms D S U U U D S U U U One 5 ms D S U U D D S U U D 2 5 ms D S U D D D S U D D 3 10 ms D S U U U D D D D D 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D D D D 6 10 ms D S U U U D S U U D

The first n OFDM symbols in each downlink subframe may be used to transmit downlink control information (DCI), where n is 0, 1, 2, 3, or 4. The DCI includes a physical downlink control channel (PDCCH) and other control information. Other OFDM symbols may be used to transmit physical downlink shared channel (PDSCH) or enhanced PDCCH (EPDCCH). In the LTE system, the PDCCH and the EPDCCH are used to allocate DCI and downlink channel resources (hereinafter referred to as DL grant) for allocating uplink channel resources (hereinafter referred to as UL grant) It carries DCI. In the LTE system, DCIs of several UEs are transmitted separately. DL Grant and UL Grant in DCI are also transmitted separately.

In a LTE-Advanced (LTE-A) system, a plurality of component carriers (CCs) are bundled to obtain a working bandwidth, i.e. carrier aggregation (CA) The bundled carriers form the downlink and uplink links of the communication system, so that a higher transmission rate can be achieved. The bundled CCs may adopt the same duplexing scheme, i.e. both CCs may be FDD cells or both CCs may be TDD cells. Alternatively, the grouped CCs may adopt different duplexing schemes. That is, at the same time, FDD cells and TDD cells may exist. The base station can be configured to operate in a plurality of cells including one Pcell (Priamry cell) and a plurality of Scell (Secondary cell). In the CA system, the initial transmission and retransmission of the same transport block (TB) is through the same CC. In the LTE CA system, the HARQ-ACK and channel state information (CSI) of the physical uplink control channel are transmitted only from the Pcell.

The LTE systems generally operate in an authorized band to avoid interference from other systems. In addition to the licensed band, there are also unlicensed bands. In general, unlicensed bands are already allocated for radar systems and / or wireless local area network (WiFi) systems that are defined for other uses, e.g., 802.11 standards. WiFi systems in the 802.11 family operate based on CSMA / CA (carrier sense access / collision avoidance) mechanisms. A mobile station (STA) has to check a radio channel before transmitting a signal, and can transmit a signal to the radio channel only when the radio channel remains idle for a predetermined time. The STA can use two mechanisms at the same time to detect the state of the wireless channel. The STA may apply carrier sensing to the wireless channel and may determine that the wireless channel is busy when signals from other STAs are detected or the detected signal power exceeds a predefined threshold. The physical layer module of the STA may transmit a clear channel assessment (CCA) report to the upper layer module indicating that the wireless channel is busy. At the same time, the WiFi systems of the 802.11 family also introduce a virtual carrier sensing technique, a network allocation vector (NAV), which indicates the duration for which the wireless channel is reserved. Each 802.11 frame includes a duration field, and the value of the NAV in the duration field can be used to determine that signals can not be transmitted on the wireless channel.

LTE systems require more spectrum resources to meet the requirements of increasing mobile communication services. A possible solution is to use LTE systems on unlicensed bands. In conventional LTE CA systems, the initial transmission of the same TB and the HARQ retransmission are limited in one CC. Like the congestion mechanism of WiFi schemes, an LTE device needs to check the state of its channel to avoid interfering with other devices before transmitting the signal to the channel via unlicensed bands. The LTE device can occupy the channel only when the channel occupation condition is satisfied. In addition, an LTE device may occupy a channel only during the duration of one or a plurality of subframes, and then release the channel for use by other devices. Thus, an LTE device may occupy a channel After transmitting the data, the channel resources should be released. When there are a large number of devices competing for the same carrier, the LTE device may wait for a long time until it has another opportunity to occupy the channel to perform HARQ retransmission of data if the most recent data transmission fails . This greatly degrades the efficiency of HARQ transmission.

Various examples of the present disclosure provide a HARQ transmission method and apparatus for implementing a fast retransmission of failed data and cross-carrier HARQ transmission with improved data transmission performance.

In order to achieve the above object, various examples provide the following technical mechanisms.

A HARQ transmission method according to an embodiment of the present disclosure includes: receiving configuration information of a cross-carrier HARQ transmission from a base station by a UE using a CA; Receiving, by the UE, downlink control information (DCI) transmitted by the base station, and receiving downlink data or transmitting the uplink data via the scheduled data channel in the DCI according to the setting information , And the data channels for initial transmission and retransmission for the same data are allowed to belong to different component carriers (CC).

In one example, the UE may receive a CC indication identifying the CC of the currently scheduled data. Data having the same CC indication is allowed to be transmitted on data channels of different CCs.

The procedure for receiving the downlink data or transmitting the uplink data includes applying the HARQ combination to the initial transmission and retransmission of data having the same HARQ process ID and the same CC indication. The HARQ process is identified through the CC indication with the HARQ process ID.

In one example, the CC indication is the index of the CC in all of the CCs allocated to the UE.

In one example, all of the CCs assigned to the UE are divided into a plurality of groups, and when a cross HARQ transmission is performed within each of the plurality of groups, the CC indication is an index of a CC in the group to which the CC belongs.

In one example, when the CC identified by the CC indication adopts a transmission mode (TM) consisting of one transport block (TB) and the CC to which the scheduled data channel belongs adopts a TM consisting of two TBs, Wherein the procedure for receiving downlink data or transmitting uplink data over the scheduled data channel is to set up a scheduled data channel to be allowed to schedule data for one TB, A TB determined using the control information of two TBs in the DCI or a fixed TB among the two TBs; Or the data of the CC identified by the CC indication in a first one of the two TBs transmitted on the scheduled data channel and wherein the scheduled data channel in the second of the two TBs The first TB may comprise a TB which is fixed TB or is identified by information in higher layer signaling or DCI.

In one example, when the CC identified by the CC indication adopts a TM consisting of two TBs and the CC to which the scheduled data channel belongs adopts a TM consisting of one TB, down through the scheduled data channel The procedure for receiving the link data or transmitting the uplink data is such that the data transmitted via the scheduled data channel is a fixed TB or a TB that is identified by specific information in the two TBs of the CC identified by the CC indicator ; ≪ / RTI > Or determining that data transmitted on the scheduled data channel is TB identified by information in DCI or higher layer signaling in the two TBs of CC identified by the CC indicator; Or determining that the data transmitted on the scheduled data channel is the TB identified by the NDI field of the DCI format in the two TBs of CC identified by the CC indicator; Or if the NDI in the current scheduled DCI is compared to the NDI in the most recent transmission of the two TBs in the CC identified by the CC indicator and the NDI of only one TB is not changed, Determining TB as data to be transmitted on the scheduled data channel; Otherwise, it is determined that the data transmitted on the scheduled data channel is a fixed TB, or TB in the DCI in the two TBs of the CC identified by the CC indicator or identified by upper layer signaling .

In one example, the CC identified by the CC indication is the CC occupied by the physical channel for initial transmission or retransmission of the data identified by the CC, or is any CC among the CCs allocated to the UE.

In one example, when the current scheduled data is an initial transmission, the CC identified by the CC indication in the DCI has the same index as the CC to which the scheduled data channel belongs; The CC identified by the CC indication is the CC occupied by the physical channel for the initial transmission of the data identified by the CC.

In one example, the CC indication is sent over a newly defined field, or an existing field in the DCI format in the DCI; The CC indication is transmitted in DCI format in a common search space, and the CC indication is valid for a plurality of consecutive subframes.

In one example, when both the CC identified by the CC indication and the CC to which the scheduled data channel belongs adopt a TM comprised of two TBs, the NDI in the current scheduled DCI is identified by the CC indication Compare the NDI in the most recent transmission of the two TBs in the CC and if the NDI of one of the two TBs is changed and the NDI of the remaining TBs is not changed, Wherein the transmitting step comprises: determining data transmitted through the scheduled data channel corresponding to the TB having the unaltered NDI as retransmission of data of the CC identified by the CC indication; Determining data transmitted on the scheduled data channel corresponding to the TB having the changed NDI as the initial transmission of the CC identified by the CC indication; Or the data transmitted through the scheduled data channel corresponding to the TB having the unaltered NDI as the retransmission of the data of the CC identified by the CC indication and transmits the NDI of the currently scheduled DCI to the scheduled data channel The data transmitted through the scheduled data channel corresponding to the TB having the changed NDI is transmitted to the TB data of the CC to which the scheduled data channel belongs according to a result of comparison with the NDI of the most recent transmission of the TB in the CC to which the scheduled data channel belongs And judging that the transmission is an initial transmission or a retransmission.

In one example, when the CC identified by the CC indication adopts a transmission mode (TM) composed of two transport blocks (TB) and the CC to which the scheduled data channel belongs adopts a TM consisting of one TB, The procedure for receiving downlink data or transmitting uplink data over a scheduled data channel includes comparing the NDI in the current scheduled DCI to the NDI in the most recent transmission of TB in the CC identified by the CC indication; And determining that the data transmitted through the scheduled channel is a TB having the unmodified NDI when the NDI of only one TB is unchanged.

In one example, the UE may receive VCC information identifying a virtual component carrier (VCC) corresponding to the current scheduled data. Data corresponding to the same VCC is allowed to be transmitted on PDSCHs of different CCs; The procedure for receiving downlink data or transmitting uplink data includes applying HARQ combinations for initial transmission and retransmission of data having the same HARQ process ID and the same VCC, and the HARQ process is performed with VCC It is identified by an index.

In one example, the VCC indication is transmitted via a newly defined field, or a conventionally defined field of the DCI format in the DCI; The VCC indication is transmitted in DCI format in a common search space, and the VCC indication is valid for a plurality of consecutive subframes.

In one example, the VCCs assigned to the UE may have different index information;

When a total of N CCs assigned to a UE are divided into a plurality of groups and a cross-carrier HARQ transmission is performed within each group, the intra-group VCCs have different index information.

In one example, a method for configuring a TM for VCCs assigned to a UE includes establishing a number of TBs allowed to be transmitted simultaneously in a subframe in each VCC, via upper layer signaling; Setting up the same number of TBs allowed to be transmitted in a subframe for all VCCs, via upper layer signaling; Or predefining the number of TBs allowed to be transmitted simultaneously in a subframe in each VCC; Or when setting each CC of the UE, determining whether the configuration information of each CC can be mapped to the configuration information of the VCC, wherein the TM of VCC is obtained from the TM of CC that can be mapped to VCC; Or if the CC in the group of CCs allocated to the UE adopts a TM consisting of two TBs, setting each VCC to be allowed to simultaneously carry two TBs in one subframe; Otherwise, setting each VCC to be allowed to simultaneously carry one TB within one subframe in the CC; Or number X and sets each of the first X VCCs of all VCCs assigned to the UE to be allowed to simultaneously carry two TBs in one subframe, and if M is equal to the total number of VCCs allocated to the UE , It may include setting the remaining MX VCCs to be able to simultaneously carry one TB in one subframe.

In one example, the procedure for transmitting data through the scheduled data channel maps and transmits data of VCC adopting TM configured as one TB onto CC adopting TM configured as one TB, and two TBs Mapping and transmitting data of VCC adopting TM composed of two TBs onto CC adopting TM consisting of two TBs; Or the data of the VCC adopting the TM composed of one TB is mapped and transmitted on the CC adopting the TM composed of one TB and the data of the VCC adopting the TM composed of the two TBs is transferred onto the arbitrary CC Mapping and transmitting; Or the data of the VCC adopting the TM composed of one TB is mapped and transmitted on the arbitrary CC, and the data of the VCC adopting the TM composed of the two TBs is transferred onto the CC adopting the TM composed of the two TBs Mapping and transmitting; Or setting the data of each VCC to be allowed to be mapped and transmitted on any CC.

In one example, when the VCC is comprised of a TM having one TB and the CC to which the scheduled data channel belongs comprises a TM having two TBs, the scheduled data channel is configured to schedule data of one TB And TB of VCC is mapped to TB allowed to be scheduled; For a normal DCI, a TB allowed to be scheduled by the scheduled data channel determines that a fixed TB of the CC to which the scheduled data channel belongs is a TB that is allowed to be scheduled; Determining a TB allowed to be scheduled according to the control information of the two TBs; Is determined by determining the TB allowed to be scheduled according to the indication in the DCI format or higher layer signaling.

In one example, when the VCC adopts a TM consisting of two TBs and the CC to which the scheduled data channel belongs adopts a TM consisting of one TB, it receives downlink data via the scheduled data channel, The procedure for transmitting the link data includes determining as fixed TB of the VCC or TB identified by the specific information as data to be transmitted through the scheduled data channel; Or determining the TB identified by the indication information in the DCI or higher layer signaling as data transmitted on the scheduled data channel; Or comparing the NDI in the current scheduled DCI to the NDI in the most recent transmission of the two TBs of the VCC; Determining a TB having the unmodified NDI as data to be transmitted on the scheduled data channel if only one of the two TBs does not change; Otherwise, determining the TB in the fixed TB or DCI of the VCC or the TB identified by the upper layer signaling as the data transmitted on the scheduled data channel.

In one example, the UE may receive a combined HARQ process ID that identifies a combined HARQ process corresponding to the current scheduled data. Data corresponding to the same combined HARQ process is allowed to be transmitted on PDSCHs of different CCs; Transmitting the uplink data or receiving the downlink data includes applying the HARQ combination to the initial transmission and retransmission of data corresponding to the combined HARQ process ID.

In one example, the combined HARQ processes may have different combined HARQ process IDs; When the N CCs allocated to the UE are divided into a plurality of groups and a cross-carrier HARQ transmission is performed in each group, the same intra-group combination HARQ processes have different combined HARQ process IDs.

In one example, a method for configuring a TM for a combined HARQ processes of a UE in a CC comprises establishing a number of TBs allowed to be carried simultaneously in a subframe of the CC for each combined HARQ process, via upper layer signaling step; Setting up the same number of TBs allowed to be carried simultaneously in a subframe of the CC for all combinatorial HARQ processes, via upper layer signaling; Predefining the same number of TBs allowed to be carried simultaneously within a subframe of the CC for all HARQ processes; Or when one CC of a group of CCs is assigned to a UE supporting a TM with two TBs, setting up to allow two TBs to be carried simultaneously in a subframe of the CC for each combined HARQ process; Establishing that one TB is allowed to be carried simultaneously in a subframe of the CC for each combined HARQ process when none of the groups of CCs is assigned to a UE supporting a TM having two TBs; Or X, and the first X combinatorial HARQ processes of all combinations of HARQ processes of the UE are allowed to simultaneously carry two TBs in a subframe of CC, and the remaining Mg-X HARQ processes are allowed to carry CC Setting up to allow simultaneous transport of one TB within a frame, wherein Mg is a total number of combinatorial HARQ processes set for the UE; Or setting the number of TBs allowed to be simultaneously carried in a subframe of the CC corresponding to the combined HARQ process ID based on the TM of the physical CC occupied by the most recent initial transmission of the combined HARQ ID.

In one example, the procedure for transmitting data via the scheduled data channel is such that data corresponding to a combined HARQ process ID composed of one TB is mapped onto CCs adopting a TM composed of one TB and set to be transmitted And setting the data corresponding to the combination HARQ process ID composed of the two TBs to be mapped and transmitted on the CC adopting the TM composed of two TBs; Or the data corresponding to the combination HARQ process ID composed of one TB is mapped and transmitted on the CC supporting the TM composed of one TB and the data corresponding to the combination HARQ process ID composed of two TBs To be mapped onto an arbitrary CC and to be transmitted; or

Comprising the steps of: setting data corresponding to a combined HARQ process ID composed of one TB to be mapped on an arbitrary CC and transmitting data corresponding to a combined HARQ process ID composed of two TBs to a TM To the CC that adopts the < RTI ID = 0.0 > CC < / RTI > Or setting the data corresponding to the combined HARQ process ID to be allowed to be mapped and transmitted on any of the CCs.

In one example, when the combined HARA process is configured with a TM having one TB and the CC to which the scheduled data channel belongs is composed of TMs having two TBs, the scheduled data channel includes data of one TB Wherein a TB of the combined HARQ process is mapped to a TB allowed to be scheduled; For a normal DCI, a TB allowed to be scheduled by the scheduled data channel determines that a fixed TB of the CC to which the scheduled data channel belongs is a TB that is allowed to be scheduled; Determining a TB allowed to be scheduled according to the control information of the two TBs; Is determined by determining the TB allowed to be scheduled according to the indication in the DCI format or higher layer signaling.

In one example, when the combined HARQ process adopts a TM consisting of two TBs and the CC to which the scheduled data channel belongs adopts a TM consisting of one TB, the downlink data is transmitted via the scheduled data channel Wherein the procedure for receiving or transmitting uplink data comprises determining as fixed TB of the combined HARQ process or TB identified by specific information as data transmitted on the scheduled data channel; Determining a TB of a combined HARQ process identified by the indication information in the DCI or higher layer signaling as data to be transmitted through the scheduled data channel; Or comparing the NDI in the current scheduled DCI with the NDI in the most recent transmission of the two TBs of the combined HARQ process; Determining a TB having the unmodified NDI as data to be transmitted on the scheduled data channel if only one of the two TBs does not change; Otherwise, determining the TB in the fixed TB or DCI of the combined HARQ process or the TB of the combined HARQ process identified by the higher layer signaling as the data transmitted on the scheduled data channel.

The HARQ transmission apparatus may include a configuration receiving module, a scheduling module, and a data transmission / reception module.

The configuration receiving module is configured to receive configuration information of a cross-carrier HARQ transmission transmitted by a base station.

The scheduling module is configured to receive a DCI transmitted by a base station and to determine a data channel scheduled by the DCI.

The data transmission / reception module is configured to receive downlink data or transmit uplink data through a data channel determined by the scheduling module according to the setting information.

Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.
1 is a schematic diagram showing an example of a general LTE based FDD frame,
2 is a schematic diagram illustrating an example of a typical LTE-based TDD frame,
FIG. 3 is a flowchart illustrating an example of an overall HARQ transmission method according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram showing an example of the overall structure of an HARQ transmission apparatus according to an embodiment of the present disclosure; FIG.

The principles of operation of the preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The same elements shown in the drawings are denoted by the same reference numerals even though they are shown in different drawings, and in the following description of the present disclosure, a detailed description of related functions or configurations will not be necessary to the contrary. The detailed description thereof will be omitted. It is to be understood that the following terms are defined in consideration of the functions of the present disclosure and may vary depending on the user, the intention or custom of the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS For a more complete understanding of the objects, techniques, and advantages of the present invention, reference will now be made, by way of example, to the Detailed Description,

Unlicensed bands would have already been used in other wireless communication systems, such as radar systems, WiFi systems, and so on. In addition, LTE systems belonging to a plurality of LTE systems, e.g., several operators, may be placed in unauthorized bandwidths. In the following description, an LTE device may simply refer to a base station or a UE. An LTE device must check the state of its channel before transmitting it to a channel in unlicensed bands, so as not to interfere with devices from other LTE devices or other wireless systems. The LTE device can occupy the channel only when the channel occupation condition is satisfied. In addition, an LTE device may occupy a channel only during the duration of one or a plurality of subframes, and then release the channel for other devices to use.

In conventional LTE CA systems, the initial transmission of the same TB and the HARQ retransmission are limited in one CC. However, the resource contention method significantly degrades the efficiency of HARQ transmission in unlicensed bands. For example, an LTE device must occupy a channel, transmit data, and then release channel resources. When there are a large number of devices competing for the same carrier, the LTE device may wait for a long time until it has another opportunity to occupy the channel to perform HARQ retransmission of data if the most recent data transmission fails . In order to take full advantage of HARQ transmissions to improve data transmission performance, it should be possible to retransmit its TBs via other carriers when a previous transmission of TB fails. That is, cross-carrier HARQ transmission is required.

According to the cross-carrier HARQ transmission, the same data can be transmitted over multiple CCs, and CCs can have various numbers of TBs. Each CC has a TM suitable for the CC according to the channel state of the CC. Regardless of whether the transmission is an initial transmission or a retransmission of data, the data is transmitted via the CC according to the TM set for the CC. According to conventional LTE standards, each TM supports two DCI formats at the same time. For DL scheduling, the normal DCI format may be DCI 1 / 1B / 1D / 2 / 2A / 2B / 2C / 2D, and the fallback DCI format may be DCI 1A. For UL scheduling, the normal DCI format may be DCI 4, and the fallback DCI format may be DCI 0. A normal DCI format can support data transmission of one TB or two TBs, and a fallback DCI format can support only one TB of data transmission. Various examples implement a cross-carrier HARQ transmission and retransmission without causing confusion, thereby providing a mechanism to ensure data transmission performance.

3 is an example of a flowchart illustrating a method of transmitting a cross-carrier HARQ in an LTE system according to an example of the present disclosure. The method may include the following procedures.

Referring to FIG. 3, at block 301, the UE receives configuration information of a cross-carrier HARQ transmission from a base station. Here, the setting information sets the UE to perform data transmission based on the cross-carrier HARQ.

 At block 302, the UE receives the DCI transmitted by the base station and either transmits the uplink data or receives the downlink data on the data channel scheduled by the DCI according to the setup information.

After receiving the DCI, the UE may combine the soft information of at least two transmissions of the same data from different CCs according to the DCI. That is, different transmissions of the same data may occur through data channels of different CCs.

The mechanism of the present disclosure will now be described in detail with reference to the following examples.

Example 1

In one example, the initial transmission and retransmission of the same data may occur in the physical channels of different CCs during the cross-carrier HARQ transmission, but may be identified by the same CC indication. The CC identified by the CC indication may be one of the CCs occupied by the physical channels of the initial transmission or retransmission of the data, or any of the CCs allocated to the UE. The HARQ process is identified through the CC indication with the HARQ process ID. Taking the downlink transmission as an example, when receiving the downlink data, the UE can combine the HARQ of the initial transmission and retransmission of the data corresponding to the same HARQ process ID and having the same CC indication.

The CC indication may be sent via the DCI which schedules the data transmission. For example, a newly introduced CC indication corresponding to the currently scheduled data may be transmitted via a newly added field or a conventionally defined field in the DCI format. Alternatively, the CC indication may correspond to a plurality of consecutive subframes on the carrier. For example, the CC indication corresponding to the data transmission in all subframes occupied by the channel may be transmitted together with the channel occupancy indication of the cell operating in the unlicensed band. For example, a channel occupancy indication, and a CC indication corresponding to a plurality of consecutive subframes, may be transmitted in DCI format in a common search space (CSS). The DCI format may have a number of bits, such as DCI format 1A or 1C, to avoid blind detection increases in the DCI format.

The CC indication in the DCI format may be the index of the CC, assuming that the UE is configured with N CCs and the cross-carrier HARQ transmission of the data of one CC can be performed via any CC. Alternatively, when all of the CCs assigned to the UE are divided into a plurality of groups and a cross HARQ transmission is performed within each of the plurality of groups, the CC indication is an index of a CC in the group to which the CC belongs. Taking the downlink transmission as an example, the downlink data scheduled by the CC's own scheduling can be transmitted on the PDSCH in the CC, that is, the data of the CC identified by the CC indication is transmitted on the PDSCH in the CC. The downlink data scheduled by the cross carrier scheduling is transmitted on the PDSCH of the CC identified by the CIF field, that is, the data of the CC identified by the CC indication is transmitted on the PDSCH of the CC identified by the CIF field.

In the following, to illustrate the method of various examples, CC A identified by the CC indication and data transmission according to CC B to which the scheduled data channel belongs are exemplified. CC A and CC B may be the same CC or different CCs.

Assuming that both CC A and CC B adopt a Transmission mode (TM) composed of one TB, the NDI (New Data Indicator) value of the most recent data transmission of CC A is based on the HARQ process ID in DCI format It is compared with the NDI value of the currently scheduled DCI and a determination is made whether the current scheduled data is the initial transmission or retransmission of data. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of the data corresponding to the HARQ process ID of CC A. If the value of the NDI does not change, it is determined that the currently scheduled data is the retransmission of the data corresponding to the HARQ process ID of the CC A.

Assuming that both CC A and CC B adopt a TM composed of two TBs, for each of the two TBs, the NDI value of the most recent data transmission of CC A is based on the HARQ process ID in DCI format It is compared with the NDI value of the currently scheduled DCI and a determination is made whether the current scheduled data is the initial transmission or retransmission of data. When the value of NDI of both TBs is changed, it is judged that both TBs are the first transmission of data corresponding to the HARQ process ID of CC A. If the value of the NDI of both TBs does not change, it is determined that both TBs are retransmitting data corresponding to the HARQ process ID of CC A. If only the NDI value of one of the two TBs is not changed, the TB having the unchanged NDI is the data retransmission corresponding to the HARQ process ID of the CC A, and the remaining TB having the changed NDI is the data of the HARQ process ID of the CC A Initial transmission.

Assuming that CC A adopts TM consisting of one TB and CC B adopts TM consisting of two TBs, the processing method is as follows.

In one example, the data channel of CC B is set to be allowed to schedule only one TB. A normal DCI can schedule one of two TBs, a TB of CC A is mapped to that TB, and the other of the two TBs is disabled. In one example, TB 1 is set to be always enabled. In another example, TB 2 may be set to be always enabled. In another example, the enabled TB of two TBs may be identified according to the MCS along with the RV, e.g., according to the control information of the two TBs in the normal DCI, in which case the MCS and RB of only one TB may be identified as TB Is set to be enabled. In yet another example, an enabled TB of two TBs may be identified according to other information in the DCI or higher layer signaling, and the UE may determine the TB allowed to be scheduled at CC B according to the indication information. The fallback DCI can schedule only one TB, and the TB of CC A is mapped to that TB. The value of the NDI at the time of the most recent data transmission of the CC A can be compared with the value of the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format and it is judged whether the currently scheduled data is the initial data transmission or the data retransmission Is down. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of the data corresponding to the HARQ process ID of CC A. If the value of the NDI does not change, it is determined that the currently scheduled data is the retransmission of the data corresponding to the HARQ process ID of the CC A.

In one example, one TB of the data channels of CC B is used to transmit the data of CC A, and the remaining TB is used to transmit the data of CC B. For normal DCI, the TB of CC A is always mapped to TB1 of the scheduled data channel for CC B, or may always be mapped to TB 2 of the scheduled data channel for CC B. In another example, the TB of CC A may be mapped to the TB identified by other information in the DCI of the data channel scheduled for higher layer signaling or CC B, where the UE may perform scheduling It is possible to identify the allowed TBs. The fallback DCI can schedule only one TB, and the TB of CC A is mapped to that TB. For the TB to which the data of the CC A is mapped, the value of the NDI at the time of the most recent data transmission of the CC A can be compared with the value of the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format, Lt; / RTI > is the initial data transmission or data retransmission. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of the data corresponding to the HARQ process ID of CC A. If the value of the NDI does not change, it is determined that the currently scheduled data is the retransmission of the data corresponding to the HARQ process ID of the CC A. The value of the NDI at the time of the most recent data transmission of the CC B can be compared with the value of the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format, A determination is made whether the data is the initial transmission or retransmission of the TB of CC B. In one example, mapping the TB of CC A to TB 2 of the data channels of CC B enables transmission of CC A's TB to CC B and CC B's TB B retransmissions of TB 1, Is the TB1 of CCB.

Assuming that CC A adopts TM consisting of two TBs and CC B adopts TM consisting of one TB, the processing method is as follows. Because CC B has only one TB transmission capacity, TB 1 of CC A can always be transmitted over CC B. In another example, TB2 of CC A may always be transmitted via CC B. In another example, the index of the TB of the currently transmitted CC A may be obtained from the predetermined information. For example, the index in the information is denoted by k, and the index of the TB of the currently transmitted CC A may be mod (k, 2) +1. Information identifying the TB index of the currently transmitted CC A may be one or more of the index of the PDCCH / EPDCCH in the search space of the UE, the index of the surveillance index, the index of the CC, and the index of the start PRB of the allocated data channel . In another example, the TB of the CC A transmitted via CC B may be identified by higher layer signaling or other information in the DCI, and the UE may determine the TB of the CC A (i.e., TB) can be identified. In another example, the NDI field in the DCI format identifies the TB that is currently retransmitted. For example, NDI = 0 indicates retransmission of TB 1 of CC A, and NDI = 1 indicates retransmission of TB 2 of CC A. In another example, for each of the two TBs of CC A, the NDI at the most recent transmission is compared to the NDI in the current scheduled DCI. If only the NDI of one TB has not been changed, the TB with such unmodified NDI is sent via CC B. If the NDIs of both TBs are unchanged or changed, the TB transmitted via CC B may always be TB1 of CC A, TB2 of CC A, or otherwise identified by higher layer signaling or other information within the DCI. In this case, the UE identifies TBs (i.e., TBs identified by the instruction information) of CC A, which is data transmitted according to the instruction information. For the TB to which the data of the CC A is mapped, the value of the NDI at the time of the most recent data transmission of the CC A can be compared with the value of the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format, Lt; / RTI > is the initial data transmission or data retransmission. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of the data corresponding to the HARQ process ID of CC A. If the value of the NDI does not change, it is determined that the currently scheduled data is the retransmission of the data corresponding to the HARQ process ID of the CC A. Allowing the change of the TB of the CC A to be mapped to CC B for transmission can prevent one of the TBs of CC A from having no retransmission opportunity for a long time. For example, assuming that TB1 of CC A is always mapped to CC B, when the most recent transmission of TB2 is not correct, TB2 of CC A may not be able to be retransmitted through CC B, The channel of the CC using the configured TM may not be used. As such, TB2 of CC A will not be able to be retransmitted for a long time, which degrades the performance of the HARQ process.

Example 2

In one example, the initial transmission and retransmission of the same data may occur in the physical channels of different CCs during the cross-carrier HARQ transmission, but may be identified by the same CC indication. The CC identified by the CC indication may be the CC to which the physical channel for the initial transmission of data belongs. The HARQ process is identified through the CC indication with the HARQ process ID. Taking the downlink transmission as an example, when receiving the downlink data, the UE can combine the HARQ of the initial transmission and retransmission of the data corresponding to the same HARQ process ID and having the same CC indication.

The CC indication may be sent via the DCI which schedules the data transmission. For example, a newly introduced CC indication corresponding to the currently scheduled data may be transmitted via a newly added field or a conventionally defined field in the DCI format. Alternatively, the CC indication may correspond to a plurality of consecutive subframes on the carrier. For example, the CC indication corresponding to the data transmission in all subframes occupied by the channel may be transmitted together with the channel occupancy indication of the cell operating in the unlicensed band. For example, a channel occupancy indication, and a CC indication corresponding to a plurality of consecutive subframes, may be transmitted in DCI format in a common search space (CSS). The DCI format may have a number of bits, such as DCI format 1A or 1C, to avoid blind detection increases in the DCI format.

The CC indication in the DCI format may be the index of the CC, assuming that the UE is configured with N CCs and the cross-carrier HARQ transmission of the data of one CC can be performed via any CC. Alternatively, when all of the CCs assigned to the UE are divided into a plurality of groups and a cross HARQ transmission is performed within each of the plurality of groups, the CC indication is an index of a CC in the group to which the CC belongs. Taking the downlink transmission as an example, the downlink data scheduled by the CC's own scheduling can be transmitted on the PDSCH in the CC, that is, the data of the CC identified by the CC indication is transmitted on the PDSCH in the CC. The downlink data scheduled by the cross carrier scheduling is transmitted on the PDSCH of the CC identified by the CIF field, that is, the data of the CC identified by the CC indication is transmitted on the PDSCH of the CC identified by the CIF field.

Unlike Example 1, in Example 2, when the scheduled data is the initial transmission, the CC indication identifying the data is set to match the index of the CC to which the scheduled data channel belongs. In the following, to illustrate the method of various examples, CC A identified by the CC indication and data transmission according to CC B to which the scheduled data channel belongs are exemplified. CC A and CC B may be the same CC or different CCs.

Assuming that both CC A and CC B adopt a TM composed of one TB, the NDI value of the most recent data transmission of CC A is compared with the NDI value of the currently scheduled DCI based on the HARQ process ID of the DCI format And a determination is made whether the current scheduled data is an initial transmission or a retransmission of data. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of the data corresponding to the HARQ process ID of CC A. CC A must be the same as CC B. If CC A is not equal to CC B, it is determined that an error has occurred. If the value of the NDI does not change, it is determined that the currently scheduled data is the retransmission of the data corresponding to the HARQ process ID of the CC A.

Assuming that both CC A and CC B adopt a TM composed of two TBs, for each of the two TBs, the NDI value of the most recent data transmission of CC A is based on the HARQ process ID in DCI format It is compared with the NDI value of the currently scheduled DCI and a determination is made whether the current scheduled data is the initial transmission or retransmission of data. When the value of NDI of both TBs is changed, it is judged that both TBs are the first transmission of data corresponding to the HARQ process ID of CC A. CC A must be the same as CC B. If CC A is not equal to CC B, it is determined that an error has occurred. If the value of the NDI of both TBs does not change, it is determined that both TBs are retransmitting data corresponding to the HARQ process ID of CC A. If only the NDI of one TB is not changed, two processing methods can be used. According to one method, a TB having an unmodified NDI can be judged as a retransmission of data corresponding to the HARQ process ID of the CC A, and another TB is judged as the initial transmission of the CC A. The initial transmission is performed via CC B, but the initial transmission is still identified by the CC indication corresponding to CC A. According to another method, a TB having an unmodified NDI can be judged as a retransmission of data corresponding to a HARQ process ID of the CC A, and another TB is judged as a transmission of data corresponding to a HARQ process ID of the CC B . The NDI at the time of the most recent data transmission of the TB of CC B can be compared with the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format and a determination is made whether the data is the initial transmission or retransmission of the TB of CC B . If the NDI of the other TB can not satisfy the HARQ transmission requirement of the TB of CC B, the TB may be disabled.

Assuming that the CC A adopts a TM consisting of one TB and the CC B adopts a TM consisting of two TBs, the initial transmission of CC A can not be performed via CC B, B is different from that of course. Some processing methods are as follows.

In one example, the data channel of CC B is set to be allowed to schedule only one TB. A normal DCI can schedule one of two TBs, a TB of CC A is mapped to that TB, and the other of the two TBs is disabled. In one example, TB 1 is set to be always enabled. In another example, TB 2 may be set to be always enabled. In another example, the enabled TB of two TBs may be identified according to the MCS along with the RV, e.g., according to the control information of the two TBs in the normal DCI, in which case the MCS and RB of only one TB may be identified as TB Is set to be enabled. In yet another example, an enabled TB of two TBs may be identified according to other information in the DCI or higher layer signaling, and the UE may determine the TB allowed to be scheduled at CC B according to the indication information. In another example, the NDI of the most recent transmission of the TB of CC A may be compared to the NDI in the current scheduled DCI. If only the NDI of one TB has not been changed, the TB with such unmodified NDI is sent via CC B. The fallback DCI can schedule only one TB, and the TB of CC A is mapped to that TB. The NDI at the time of the most recent data transmission of the CC A can be compared with the NDI in the currently scheduled DCI according to the HARQ process ID of the DCI format. If the value of the NDI changes, a determination can be made that an error has occurred. If the value of the NDI does not change, it can be judged that the currently scheduled data is retransmission of the data corresponding to the HARQ process ID of CC A.

In one example, one TB of the data channels of CC B is used to transmit the data of CC A, and the remaining TB is used to transmit the data of CC B. For normal DCI, the TB of CC A may always be mapped to data channels scheduled for CC B as TB 1, or may always be mapped to data channels scheduled for CC B as TB 2. In another example, the TB of CC A may be mapped to the TB identified by other information in the DCI of the data channel scheduled for higher layer signaling or CC B, where the UE may perform scheduling It is possible to identify the allowed TBs. The fallback DCI can schedule only one TB, and the TB of CC A is mapped to that TB. For the TB to which the CC A data is mapped, the NDI at the time of the most recent data transmission of the CC A can be compared with the NDI in the currently scheduled DCI according to the HARQ process ID of the DCI format. If the value of the NDI changes, a determination can be made that an error has occurred. If the value of the NDI does not change, it can be judged that the currently scheduled data is retransmission of the data corresponding to the HARQ process ID of CC A. The value of the NDI at the time of the most recent data transmission of the CC B can be compared with the value of the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format, A determination is made whether the data is the initial transmission or retransmission of the TB of CC B. In one example, mapping the TB of CC A to TB 2 of the data channels of CC B enables transmission of CC A's TB to CC B and CC B's TB B retransmissions of TB 1, Is the TB1 of CCB.

Assuming that CC A adopts TM consisting of two TBs and CC B adopts TM consisting of one TB, the initial transmission of CC A can not be performed via CC B, B is different from that of course. Some processing methods are as follows. Because CC B has only one TB transmission capacity, TB 1 of CC A can always be transmitted over CC B. In another example, TB2 of CC A may always be transmitted via CC B. In another example, the index of the TB of the currently transmitted CC A may be obtained from the predetermined information. For example, the index in the information is denoted by k, and the index of the TB of the currently transmitted CC A may be mod (k, 2) +1. Information identifying the TB index of the currently transmitted CC A may be one or more of the index of the PDCCH / EPDCCH in the search space of the UE, the index of the surveillance index, the index of the CC, and the index of the start PRB of the allocated data channel . In another example, the TB of the CC A transmitted via CC B may be identified by higher layer signaling or other information in the DCI, and the UE may determine the TB of the CC A (i.e., TB) can be identified. In another example, the NDI field in the DCI format identifies the TB that is currently retransmitted. For example, NDI = 0 indicates retransmission of TB 1 of CC A, and NDI = 1 indicates retransmission of TB 2 of CC A. In another example, for each of the two TBs of CC A, the NDI at the most recent transmission is compared to the NDI in the current scheduled DCI. If only the NDI of one TB has not been changed, the TB with such unmodified NDI is sent via CC B. If the NDIs of both TBs are unchanged or changed, the TB transmitted via CC B may always be TB1 of CC A, TB2 of CC A, or otherwise identified by higher layer signaling or other information within the DCI. In this case, the UE identifies TBs (i.e., TBs identified by the instruction information) of CC A, which is data transmitted according to the instruction information. For the TB to which the CC A data is mapped, the NDI at the time of the most recent data transmission of the CC A can be compared with the NDI in the currently scheduled DCI according to the HARQ process ID of the DCI format. If the value of the NDI changes, a determination can be made that an error has occurred. If the value of the NDI does not change, it can be judged that the currently scheduled data is retransmission of the data corresponding to the HARQ process ID of CC A. Allowing the change of the TB of the CC A to be mapped to CC B for transmission can prevent one of the TBs of CC A from having no retransmission opportunity for a long time. For example, assuming that TB1 of CC A is always mapped to CC B, when the most recent transmission of TB2 is not correct, TB2 of CC A may not be able to be retransmitted through CC B, The channel of the CC using the configured TM may not be used. As such, TB2 of CC A will not be able to be retransmitted for a long time, which degrades the performance of the HARQ process.

Example 3

A UE operating in CA mode is set to N carriers via RRC signaling. For reasons related to channel occupancy and base station scheduling, carriers in the unlicensed band are used for data transmission only during a portion of that time. Also, the more competing devices, the less time the channel will be able to be used by the autonomous entity. From the point of view of the UE, the amount of data that can be transmitted within a predetermined time is reduced. Thus, it is unnecessary to design a cross-carrier HARQ process in the sense that carriers can always be used for data transmission.

From the viewpoint of the UE, the N carriers can be equal to the M virtual component carriers (VCC), and a relatively large portion is allocated to the UE at the time of M VCCs. M is less than or equal to N. The data transmitted over the N carriers allocated to the UE may be regarded as the initial transmission, or the HARQ retransmission of the data of the M VCCs. The UE may operate according to the VCCs. In one example, the initial transmission and retransmission of the same data may occur in the physical channels of different CCs during a cross-carrier HARQ transmission, but may be identified by the same VCC. The HARQ process is identified by the VCC index along with the HARQ process ID. Taking downlink data transmission as an example, data of the same VCC is allowed to be transmitted on PDSCHs of different CCs. Upon receiving the downlink data, the UE may combine the HARQ of the initial transmission and retransmission of data corresponding to the same HARQ process ID of the same VCC.

To implement cross-carrier HARQ transmission, the current scheduled data needs to specify a corresponding VCC. The method of specifying the index of the VCC may include specifying the index of the VCC in the DCI that is scheduling the data transmission. For example, a newly added VCC index field or a conventional information field may be used to specify the information of the VCC index to specify the VCC that the data transmission within the subframe actually corresponds to. Another way to specify the index of the VCC may include sending indication of a valid VCC index for several successive consecutive frames of the carrier. For example, the data transmission within all the subframes occupied by the channel at this time point may be sent with indication of the channel occupancy of the cell operating in the unlicensed band, the indication information specifying the corresponding VCC. The indication information may be transmitted via the DCI. For example, channel occupancy indication and VCC information for a plurality of consecutive subframes may be transmitted in DCI format in a common search space (CSS). The DCI format has the same number of bits as the DCI format 1A or 1C so that the blind detection count of the DCI format is not increased.

When N CCs are allocated to a UE and cross-carrier HARQ transmission of VCC's data can be performed via any CC, each VCC is assigned a unique VCC index. When the N CCs allocated to the UE are divided into several groups and cross carrier HARQ transmissions are performed only within each group, each VCC is assigned to a unique VCC index within that group, but different groups are assigned the same VCC index Or may have different VCC indices. Taking the downlink transmission as an example, the downlink data scheduled by the CC's own scheduling can be transmitted on the PDSCH in the CC, i.e., the data of the VCC is transmitted on the PDSCH in the CC. The downlink data scheduled by the cross carrier scheduling is transmitted on the PDSCH of the CC identified by the CIF field, i.e. the data of the VCC is transmitted on the PDSCH of the CC identified by the CIF field.

In an LTE system, each CC may be configured with a TM. The method of the UE operating according to the VCCs requires that the TM of each VCC be known, i.e. the number of TBs that can be transmitted simultaneously through the subframe of the VCC is 1 or 2. In one example, the method sets the number of TBs allowed to be transmitted simultaneously in a subframe in each VCC, using higher layer signaling. In another example, the method uses upper layer signaling to set the number of TBs that can be held in one subframe, the number of which is the same for all VCCs. In another example, the number of TBs that can be transmitted simultaneously in a subframe of each VCC is predefined. For example, each subframe of each VCC may be defined as including two TBs. In another example, it is specified whether the configuration information of the CC can be mapped to the configuration information of the VCC when each CC of the N CCs allocated to the UE is set. The TM of the VCC mapped from the CC can be obtained according to the TM of the CC. In another example, the number of VCCs of the UE, denoted by M, may be set using higher layer signaling, and the TM of the first M CCs in the N CCs allocated to the UE are sequentially assigned to the TMs of the M VCCs Can be defined to correspond. In another example, when one CC in a group of CCs adopts a TM consisting of two TBs, a determination can be made that each VCC of a group of CCs can transmit two TBs in one subframe ; When no CC in a group adopts a TM consisting of two TBs, a determination may be made that each VCC of a group of CCs can transmit one TB in one subframe. In another example, a determination is made that the value X can be defined, the first X VCCs can transmit 2 TBs in each subframe, and the remaining M-X VCCs can transmit one TB in each subframe. M is the total number of VCCs.

In this example, the data of the VCC adopting the TM consisting of one TB can be mapped only on the CC adopting the TM composed of one TB for transmission, and the data of the VCC adopting the TM composed of the two TBs May be set to be mapped onto a CC that employs a TM comprised of two TBs for transmission. In another example, data of a VCC employing a TM comprising one TB may be mapped only on a CC adopting a TM composed of one TB for transmission, and data of a VCC adopting a TM composed of two TBs May be set to be allowed to be mapped onto any CC for transmission. In another example, data of a VCC employing a TM comprised of one TB is allowed to be mapped onto an arbitrary CC for transmission, and data of a VCC adopting a TM composed of two TBs Lt; RTI ID = 0.0 > TM, < / RTI > In another example, the data of each VCC may be set to be allowed to be mapped onto any CC for transmission.

In the following, to illustrate the method of various examples, VCC and data transmission according to CC B to which the scheduled data channel belongs are exemplified.

Assuming that both VCC and CC B adopt a TM consisting of one TB, the NDI value of the most recent data transfer of VCC is compared with the NDI value of the currently scheduled DCI based on the HARQ process ID in DCI format, A determination is made whether the current scheduled data is the initial transmission or retransmission of data. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of the data corresponding to the HARQ process ID of the VCC. If the value of the NDI does not change, it can be judged that the currently scheduled data is the retransmission of the data corresponding to the HARQ process ID of the VCC.

Assuming that both VCC and CC B adopt a TM composed of two TBs, for each of the two TBs, the NDI value of the most recent data transfer of VCC is based on the HARQ process ID in DCI format, Is compared with the NDI value of the received DCI and a determination is made whether the current scheduled data is the initial transmission or retransmission of data. When the value of the NDI of both TBs is changed, it is determined that both TBs are the first transmission of data corresponding to the HARQ process ID of the VCC. If the value of the NDI of both TBs does not change, it is determined that both TBs are retransmitting data corresponding to the HARQ process ID of the VCC. If only the value of the NDI of one of the two TBs is not changed, the TB having the unchanged NDI is the data retransmission corresponding to the HARQ process ID of the VCC, and the remaining TB having the changed NDI is the initial transmission of the data corresponding to the HARQ process ID of the VCC to be.

Assuming that VCC adopts TM consisting of one TB and CC B adopts TM consisting of two TBs, the processing method is as follows. In one example, the data channel of CC B is set to be allowed to schedule only one TB. A normal DCI can schedule one of two TBs, a TB of VCC is mapped to that TB, and the other of the two TBs is disabled. In one example, TB 1 is set to be always enabled. In another example, TB 2 may be set to be always enabled. In another example, the enabled TB of two TBs may be identified according to the MCS along with the RV, e.g., according to the control information of the two TBs in the normal DCI, in which case the MCS and RB of only one TB may be identified as TB Is set to be enabled. In yet another example, an enabled TB of two TBs may be identified according to other information in the DCI or higher layer signaling, and the UE may determine the TB allowed to be scheduled at CC B according to the indication information. The fallback DCI can schedule only one TB, and the TB of VCC is mapped to that TB. The value of the NDI at the time of the most recent data transmission of the VCC can be compared with the value of the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format and the determination as to whether the currently scheduled data is the initial data transmission or the data retransmission Down. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of the data corresponding to the HARQ process ID of the VCC. If the value of the NDI does not change, it can be judged that the currently scheduled data is the retransmission of the data corresponding to the HARQ process ID of the VCC.

Assuming that VCC adopts TM consisting of two TBs and CCB adopts TM consisting of one TB, the processing method is as follows. Because CC B has only one TB transmission capacity, TB 1 of VCC can always be transmitted over CC B. In another example, TB2 of VCC may always be transmitted via CCB. In another example, the index of the TB of the currently transmitted VCC may be obtained from the predetermined information. For example, the index in the information is denoted by k, and the index of the TB of the currently transmitted CC A may be mod (k, 2) +1. The information for identifying the index of the TB of the currently transmitted VCC includes one or more of the index of the PDCCH / EPDCCH, the index of the surveillance of the PDCCH / EPDCCH, the index of the VCC, the index of the CC, and the index of the start PRB of the allocated data channel . In another example, the TB of the VCC transmitted via CC B may be identified by higher layer signaling or other information in the DCI, and the UE may determine the TB of the VCC (i.e., the TB identified by the indication information) Can be identified. In another example, for each of the two TBs of VCC, the NDI in the most recent transmission is compared to the NDI in the current scheduled DCI. If only the NDI of one TB has not been changed, the TB with such unmodified NDI is sent via CC B. If the NDIs of both TBs are unchanged or changed, the TB transmitted via CC B can always be TBl of VCC, TB2 of VCC, or other information in upper layer signaling or DCI, In this case, the UE identifies the TB of the VCC (i.e., the TB identified by the instruction information), which is the data transmitted according to the instruction information. For the mapped TB, the value of the NDI at the time of the most recent data transmission of the VCC can be compared with the value of the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format, and whether the currently scheduled data is the original data transmission A judgment is made as to whether or not the packet is retransmitted. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of the data corresponding to the HARQ process ID of the VCC. If the value of the NDI does not change, it can be judged that the currently scheduled data is the retransmission of the data corresponding to the HARQ process ID of the VCC. Allowing the change of the TB of the VCC to be mapped to CC B for transmission can prevent one of the TBs of the VCC from having no retransmission opportunity for a long time. For example, assuming that TBl of VCC is always mapped to CC B, when the most recent transmission of TB2 is not correct, TB2 of VCC may not be able to be retransmitted through CCB, and a TM May not be able to use the channel of the CC using the channel. As such, TB2 of VCC will not be retransmitted for a long time, which degrades the performance of the HARQ process.

Example 4

A UE operating in CA mode is set to N carriers via RRC signaling. For reasons related to channel occupancy and base station scheduling, carriers in the unlicensed band are used for data transmission only during a portion of that time. Also, the more competing devices, the less time the channel will be able to be used by the autonomous entity. From the point of view of the UE, the amount of data that can be transmitted within a predetermined time is reduced. Thus, it is unnecessary to design a cross-carrier HARQ process in the sense that carriers can always be used for data transmission.

To implement cross-carrier HARQ transmission and retransmission, a combined HARQ process may be defined. The initial transmission and retransmission of the same data may be performed over the physical channels of different CCs, but are identified using the same combined HARQ process. As such, when scheduling data, a combined HARQ process ID may be transmitted in DCI format to identify a combined HARQ process corresponding to the current scheduled data. Taking the downlink transmission as an example, HARQ initial transmission and retransmission of the same data corresponding to the combined HARQ process may not be limited to the same CC but may be mapped to different CCs. The UE may apply the HARQ combination to the initial transmission and retransmission of data corresponding to the same HARQ process ID. According to the cross-carrier HARQ, the total number of required combined HARQ processes is less than the total number of the maximum number of HARQ processes calculated for each of the CCs. As such, the total number of combinatorial HARQ processes to be transmitted to the UE may be set via higher layer signaling, and the UE may operate according to the combinatorial HARQ processes. To implement cross-carrier HARQ transmission and retransmission, a newly added information field or a conventionally defined information field of the DCI format may be used to transmit a combined HARQ process ID corresponding to the current scheduled data.

When N CCs are assigned to a UE and a cross-carrier HARQ transmission of data corresponding to a combination HARQ process ID can be performed via any CC, each combination HARQ process is assigned a unique combination HARQ process ID. When the N CCs allocated to the UE are divided into a plurality of groups and the cross-carrier HARQ transmission is performed only within each group, a unique HARQ process ID is assigned to each of the HARQ processes in the group, May have the same combined HARQ process IDs or may have different combined HARQ process IDs. For example, in downlink transmission, the downlink data scheduled by the CC's own scheduling can be transmitted on the PDSCH in the CC, i.e., the data in the combined HARQ process is transmitted on the PDSCH in the CC. The downlink data scheduled by the cross carrier scheduling is transmitted on the PDSCH of the CC identified by the CIF field, i.e., the data of the combined HARQ process is transmitted on the PDSCH of the CC identified by the CIF field.

In one example, the method of a UE operating in accordance with combined HARQ processes also includes determining the number of TBs that can be transmitted on a subframe of the CC for each combined HARQ process, i.e., one TB or two TBs And the like. In one example, the number of TBs that can be transmitted on the subframe of the CC for the combined HARQ process ID may be set via higher layer signaling, respectively. In another example, the number of TBs that can be transmitted on a subframe of the CC may be set via higher layer signaling, and the number is applied to all the combined HARQ processes. In another example, the number of TBs that can be transmitted on a subframe of the CC for each of all the combined HARQ processes may be predefined such that the MIMO TM is specified with a certain value, e.g., 2 TBs. In another example, when one CC in a group of CCs adopts a TM consisting of two TBs, each combination HARQ process of a group of CCs can transmit two TBs in one subframe of the CC A decision can be made; When no CC in a group adopts a TM consisting of two TBs, a determination can be made that each combination HARQ process of a group of CCs can transmit one TB in one subframe of the CC. In another example, a value X may be defined, the first X combining HARQ processes may have two TBs transmitted on a subframe of the CC, and the remaining Mg- Lt; RTI ID = 0.0 > TB < / RTI > Mg is the total number of combinatorial HARQ processes set for the UE. In another example, the number of TBs that can be transmitted in the subframe of the CC for the combined HARQ process ID may be set based on the TM of the physical CC occupied by the most recent initial transmission corresponding to the combined HARQ ID.

In one example, data corresponding to a combined HARQ process ID composed of one TB is allowed to be mapped only on a CC adopting a TM configured as one TB for transmission, and corresponds to a combined HARQ process ID composed of two TBs Can be set to be mapped only to the CC adopting the TM consisting of two TBs for transmission. In another example, data corresponding to a combined HARQ process ID composed of one TB is allowed to be mapped only on a CC supporting a TM composed of one TB for transmission, and corresponds to a combination HARQ process ID composed of two TBs May be set to be allowed to be mapped onto any CC for transmission. In another example, data corresponding to a combined HARQ process ID consisting of one TB is allowed to be mapped onto any CC for transmission, and data corresponding to a combined HARQ process ID consisting of two TBs is transmitted for transmission It may be set to be allowed to be mapped only to the CC adopting the TM composed of two TBs. In another example, data corresponding to any combination HARQ process ID may be set to be allowed to be mapped onto any CC for transmission.

In the following, to illustrate the method of various examples, a combined HARQ process and a data transmission according to CC B to which a scheduled data channel belongs are exemplified.

Assuming that the combined HARQ process and CC B adopt a TM consisting of one TB, the NDI value of the most recent data transmission of the combined HARQ process is calculated based on the NDI value of the currently scheduled DCI based on the HARQ process ID in the DCI format And a determination is made whether the current scheduled data is an initial transmission or a retransmission of data. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of data corresponding to the combined HARQ process ID. If the value of the NDI does not change, it can be judged that the currently scheduled data is retransmission of data corresponding to the combined HARQ process ID.

Assuming that the combined HARQ process and CC B adopt a TM consisting of two TBs, for each of the two TBs, the NDI value of the most recent data transmission of the combined HARQ process is set to the HARQ process ID of the DCI format And is compared with the NDI value of the currently scheduled DCI, and a determination is made whether the current scheduled data is the initial transmission or retransmission of data. When the value of the NDI of both TBs is changed, it is judged that both TBs are the first transmission of data corresponding to the combined HARQ process ID. If the value of the NDI of both TBs does not change, it is determined that both TBs are retransmitting data corresponding to the combined HARQ process ID. If only the value of the NDI of one of the two TBs is not changed, the TB having the unchanged NDI is the data retransmission corresponding to the HARQ process ID, and the remaining TB having the changed NDI is the initial transmission of the data corresponding to the HARQ process ID.

Assuming that the combined HARQ process adopts TM consisting of one TB and CC B adopts TM consisting of two TBs, the processing method is as follows. In one example, the data channel of CC B is set to be allowed to schedule only one TB. A normal DCI can schedule one of two TBs, a TB of a combined HARQ process is mapped to that TB, and the other of the two TBs is disabled. In one example, TB 1 is set to be always enabled. In another example, TB 2 may be set to be always enabled. In another example, the enabled TB of two TBs may be identified according to the MCS along with the RV, e.g., according to the control information of the two TBs in the normal DCI, in which case the MCS and RB of only one TB may be identified as TB Is set to be enabled. In another example, the enabled TB of two TBs may be identified according to other information in the DCI or higher layer signaling, and the UE may determine the TB allowed to be scheduled at CC B according to the indication information. The fallback DCI can schedule only one TB, and the TB of the combined HARQ process is mapped to that TB. The value of the NDI at the time of the most recent data transmission of the combined HARQ process can be compared with the value of the NDI of the currently scheduled DCI according to the HARQ process ID of the DCI format and whether the currently scheduled data is the initial data transmission or the data retransmission Judgment is made. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of data corresponding to the combined HARQ process ID. If the value of the NDI does not change, it can be judged that the currently scheduled data is retransmission of data corresponding to the combined HARQ process ID.

Assuming that the combined HARQ process adopts a TM composed of two TBs and CCB adopts a TM composed of one TB, the processing method is as follows. Since CC B has a transmission capacity of only one TB, TB 1 of the combined HARQ process can always be transmitted via CC B. In another example, TB2 of the combined HARQ process may always be transmitted via CCB. In another example, the index of the TB of the currently transmitted combined HARQ process may be obtained from the predetermined information. For example, the index in the information is represented by k, and the index of the TB of the currently transmitted combined HARQ process may be mod (k, 2) +1. Information identifying the index of the TB of the currently transmitted combined HARQ process includes the index of the PDCCH / EPDCCH in the search space of the UE, the index of the combined HARQ process ID, the index of the CC, the index of the start PRB of the allocated data channel One or more. In another example, the TB of the combined HARQ process transmitted via CC B may be identified by higher layer signaling or other information in the DCI, and the UE may determine the TB of the combined HARQ process Identified TB). ≪ / RTI > In another example, for each of the two TBs of the combined HARQ process, the NDI in the most recent transmission is compared to the NDI in the current scheduled DCI. If only the NDI of one TB has not been changed, the TB with such unmodified NDI is sent via CC B. If the NDIs of both TBs are unchanged or changed, the TB transmitted via CC B can always be TB1 of the combined HARQ process, TB2 of the combined HARQ process, or identified by higher layer signaling or other information in the DCI In which case the UE identifies the TB of the combined HARQ process (i.e., the TB identified by the indication information), which is the data to be transmitted according to the indication information. For the mapped TB, the value of the NDI at the time of the most recent data transmission of the combined HARQ process can be compared with the value of the NDI of the currently scheduled DCI according to the combined HARQ process ID of the DCI format, A determination is made as to whether or not the data is retransmitted. When the value of the NDI is changed, it is determined that the currently scheduled data is the initial transmission of data corresponding to the combined HARQ process ID. If the value of the NDI does not change, it can be judged that the currently scheduled data is retransmission of data corresponding to the combined HARQ process ID. Allowing the change of the TB of the combined HARQ process that should be mapped to CC B for transmission can prevent one of the TBs of the combined HARQ process from having no retransmission opportunity for a long time. For example, if TB1 of a combined HARQ process is always mapped to CCB, then TB2 of the combined HARQ process may not be able to be retransmitted via CCB and the two TBs It may not be possible to use the channel of the CC using the TM configured with the TM. As such, TB2 of the combined HARQ process will not be retransmitted for a long period of time, which degrades the performance of the HARQ process.

The above is some examples of HARQ transmissions of this disclosure. The present application also provides an apparatus for HARQ transmission that can be configured to implement the data transmission method. 4 is an example of a schematic diagram illustrating the basic structure of an apparatus according to an embodiment of the present disclosure; As shown in FIG. 4, the apparatus 400 may include a configuration receiving module 402, a scheduling module 404, and a data transmission / reception module 406.

The configuration receiving module 402 is configured to receive configuration information of a cross-carrier HARQ transmission transmitted by a base station. The scheduling module 404 is configured to receive the DCI transmitted by the base station and to determine the data channel scheduled by the DCI. The data transmission / reception module 406 is configured to receive downlink data or transmit uplink data through a data channel determined by the scheduling module according to the setting information.

The foregoing is merely exemplary of the present disclosure and is not intended to be used to limit the scope of protection. All changes, equivalent substitutions and improvements in accordance with the principles and principles of the present disclosure should be included within the scope of the present disclosure.

The principles of operation of the preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The same elements shown in the drawings are denoted by the same reference numerals even though they are shown in different drawings, and in the following description of the present disclosure, a detailed description of related functions or configurations will not be necessary to the contrary. The detailed description thereof will be omitted. It is to be understood that the following terms are defined in consideration of the functions of the present disclosure and may vary depending on the user, the intention or custom of the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present disclosure should not be limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the appended claims.

Claims (46)

In a hybrid automatic repeat request (HARQ) transmission method by a user equipment (UE)
Receiving configuration information of a cross-carrier HARQ transmission from a base station;
Receiving downlink control information (DCI) transmitted by the base station and receiving downlink data or transmitting uplink data through a data channel scheduled by the DCI according to the setting information,
Wherein data channels for initial transmission and retransmission of the same data are allowed to belong to different component carriers (CC).
The method according to claim 1,
Further comprising receiving a CC indication identifying a CC corresponding to the current scheduled data, wherein data having the same CC indication is allowed to be transmitted on data channels belonging to different CCs,
Wherein the step of receiving the downlink data or transmitting the uplink data comprises applying an HARQ combination for the initial transmission and retransmission of data corresponding to the same HARQ process identifier and the same CC indication, RTI ID = 0.0 > CC < / RTI >
3. The method of claim 2, wherein the CC indication is an index to a CC of one of the CCs allocated to the UE,
Wherein the CC indication is an index of a CC in the group to which the CC belongs when the CCs allocated to the UE are divided into a plurality of groups and a cross HARQ transmission is performed in each of the plurality of groups.
3. The method of claim 2, wherein the CC identified by the CC indication adopts a transmission mode (TM) composed of one transport block (TB), and the CC to which the scheduled data channel belongs comprises a TM Wherein the step of transmitting the uplink data via the scheduled data channel comprises:
Setting a data channel to be allowed to schedule data of one TB, wherein the TB allowed to be scheduled by the normal DCI is a fixed TB among two TBs or a TB determined according to control information of two TBs in the DCI; or,
Determining a first one of the two TBs to be transmitted on the scheduled data channel as data of a CC identified by the CC indication, and a second one of the two TBs is a data channel to which the scheduled data channel belongs Wherein the first TB is a fixed TB or a TB identified by information in an upper layer signaling or a DCI. 3. The method of claim 2, wherein if the CC identified by the CC indication adopts a TM consisting of two TBs and the CC to which the scheduled data channel belongs adopts a TM consisting of one TB, Wherein the step of transmitting the uplink data via a channel comprises:
Determining that the uplink data is a fixed TB or a TB identified by specific information in the two TBs of the CC identified by the CC indicator; Or determining that the uplink data is TB identified by information in DCI or higher layer signaling in the two TBs of CC identified by the CC indicator; or,
Determining that the uplink data is a TB identified by a new data identifier (NDI) field in the DCI format in the two TBs of the CC identified by the CC indicator; or,
Compares the NDI in the current scheduled DCI with the NDI in the most recent transmission for the two TBs in the CC identified by the CC indicator and if only one NDI of the TB is not changed, As data to be transmitted on the scheduled data channel; Otherwise, it is determined that the data transmitted on the scheduled data channel is a fixed TB, or TB in the DCI in the two TBs of the CC identified by the CC indicator or identified by upper layer signaling ≪ / RTI > The method of any one of claims 2, 4, and 5, wherein the CC identified by the CC indication is a CC occupied by a physical channel for initial transmission or retransmission of data identified by the CC, RTI ID = 0.0 > CC, < / RTI >
The method of any one of claims 2, 4, or 5, wherein if the current scheduled data is an initial transmission, the index of the CC identified by the CC indication in the downlink control information, Lt; RTI ID = 0.0 > CC < / RTI >
Wherein the CC identified by the CC indication is a CC occupied by a physical channel for initial transmission of data identified by the CC.
8. The method of claim 6 or 7, wherein the CC indication is transmitted via a newly defined field or a customarily defined field of the DCI format in the downlink control information; Wherein the CC indication is sent in DCI format in a common search space and the CC indication is valid for a plurality of consecutive subframes.
8. The method of claim 7, wherein if both the CC identified by the CC indication and the CC to which the scheduled data channel belongs adopt a TM consisting of two TBs,
Compares the NDI in the current scheduled DCI with the NDI in the most recent transmission for each of the two TBs in the CC identified by the CC indication, changes the NDI of one of the two TBs, If the NDI of the NDI is not changed, transmitting the data through the scheduled data channel may include transmitting the data transmitted through the scheduled data channel corresponding to the TB having the unmodified NDI to the UE, Determining that the data of the CC is retransmitted; Determining that the data transmitted through the scheduled data channel corresponding to the TB having the changed NDI is the first transmission of the data of the CC identified by the CC indication; or,
Determining that the data transmitted through the scheduled data channel corresponding to the TB having the unaltered NDI is the retransmission of the data of the CC identified by the CC indication and transmitting the NDI of the currently scheduled DCI to the scheduled data channel The data transmitted through the scheduled data channel corresponding to the TB having the changed NDI is transmitted to the TB data of the CC to which the scheduled data channel belongs according to a result of comparison with the NDI of the most recent transmission of the TB in the CC to which the scheduled data channel belongs And determining that the transmission or retransmission is an initial transmission or retransmission.
8. The method of claim 7, wherein when the CC identified by the CC indication adopts a TM consisting of two TBs and the CC to which the scheduled data channel belongs adopts a TM consisting of one TB, The step of transmitting data over the channel comprises:
Comparing the NDI in the current scheduled DCI to the NDI in the most recent transmission of TB in the CC identified by the CC indication; Determining that data transmitted on the scheduled data channel is a TB having the unmodified NDI when the NDI of only one TB is unchanged.
The method of claim 1, further comprising: receiving, by the UE, VCC information specifying a virtual component carrier (VCC) corresponding to currently scheduled data, wherein the VCC data is transmitted through PDSCHs of other CCs Further comprising the steps of:
The step of receiving the downlink data or transmitting the uplink data may include applying a HARQ combination for the initial transmission and retransmission of data having the same HARQ process ID and the same VCC, ≪ / RTI >
12. The method of claim 11, wherein the VCC information is transmitted over a newly defined field, or a customarily defined field of the DCI format in the downlink control information; Wherein the VCC information is transmitted in DCI format in a common search space and the VCC information is valid for a plurality of consecutive subframes.
12. The method of claim 11, wherein the VCCs allocated to the UE have different index information;
Wherein when a total of N CCs allocated to the UE are divided into a plurality of groups and a cross-carrier HARQ transmission is performed within each group, the intra-group VCCs have different index information.
12. The method of claim 11, wherein setting the TM for each VCC of the UE comprises:
Establishing, through higher layer signaling, the number of TBs allowed to be transmitted simultaneously in a subframe in each VCC; or,
Establishing, through higher layer signaling, the same number of TBs allowed to be transmitted in a subframe for all VCCs; or,
Predefining the number of TBs allowed to be transmitted simultaneously in a subframe in each VCC; or,
Specifying, when setting each CC of the UE, whether configuration information of each CC can be mapped to configuration information of the VCC, wherein the TM of VCC is obtained from a TM of CC that can be mapped to VCC; or,
If the CC in the group of CCs allocated to the UE adopts a TM composed of two TBs, setting each VCC to be allowed to simultaneously carry two TBs in one subframe; Otherwise, setting each VCC to be allowed to simultaneously carry one TB within one subframe in the CC; or,
Defines the number X and sets each of the first X VCCs of all VCCs allocated to the UE to allow simultaneous carrying of two TBs in one subframe, and sets M to be the total number of VCCs allocated to the UE , Setting the remaining MX VCCs to be used to simultaneously carry one TB in one subframe.
12. The method of claim 11, wherein transmitting data via the scheduled data channel comprises:
The data of the VCC adopting the TM consisting of one TB is mapped and transmitted on the CC adopting the TM composed of one TB and the data of the VCC adopting the TM composed of the two TBs is divided into two TBs Mapping onto a CC adopting TM and transmitting the mapping; or,
Mapping and transmitting data of VCC adopting TM consisting of one TB onto CC adopting TM consisting of one TB and mapping data of VCC adopting TM composed of two TBs onto arbitrary CC ; or,
Mapping and transmitting data of VCC adopting TM consisting of one TB to arbitrary CC, mapping data of VCC adopting TM composed of two TBs onto CC adopting TM composed of two TBs ; or,
And setting the data of each VCC to be allowed to be mapped and transmitted on any CC.
12. The method of claim 11, wherein when the VCC adopts a TM configured with one TB and the CC to which the scheduled data channel belongs adopts a TM consisting of two TBs, Wherein the TB of the VCC is mapped to the TB allowed to be scheduled; For a normal DCI, a TB allowed to be scheduled by the scheduled data channel determines that a fixed TB of the CC to which the scheduled data channel belongs is a TB that is allowed to be scheduled;
Determining a TB allowed to be scheduled according to the control information of the two TBs;
And determining TB that is allowed to be scheduled according to the indication in the DCI format or higher layer signaling. 12. The method of claim 11, wherein when the VCC adopts a TM configured with two TBs and the CC to which the scheduled data channel belongs adopts a TM configured with one TB, How to do it,
Determining fixed TB of the VCC or TB identified by specific information as data to be transmitted on the scheduled data channel; or,
Determining the indication identified in the DCI or the TB identified by the higher layer signaling as the data transmitted on the scheduled data channel; or,
Comparing the NDI in the current scheduled DCI to the NDI in the most recent transmission of the two TBs of the VCC; If only one NDI of the two TBs is not changed, determining TB with the unmodified NDI as data to be transmitted on the scheduled data channel; Otherwise determining information in the fixed TB or DCI of the VCC or in the TB identified by the upper layer signaling as data transmitted on the scheduled data channel.
2. The method of claim 1, wherein the UE receives a combined HARQ process ID for identifying a combined HARQ process corresponding to the currently scheduled data, and permits data belonging to one combined HARQ process to be transmitted on PDSCHs of different CCs Being;
Wherein transmitting the uplink data or receiving downlink data comprises applying a HARQ combination to data corresponding to a combined HARQ process ID and to retransmission of the data.
19. The method of claim 18, wherein the different HARQ processes have different HARQ IDs;
Wherein when the N CCs assigned to the UE are divided into a plurality of groups and a cross-carrier HARQ transmission is performed in each group, the same intra-group combination HARQ processes have different combined HARQ process IDs.
19. The method of claim 18, wherein setting the TM for the combined HARQ processes of the UE via one CC comprises:
Establishing, via higher layer signaling, the number of TBs allowed to be carried simultaneously in a subframe of the CC for each combined HARQ process; or,
Setting up the same number of TBs allowed to be carried simultaneously in a subframe of the CC for all combinatorial HARQ processes, via higher layer signaling; or,
Predefining the same number of TBs allowed to be carried simultaneously in a subframe of the CC for all combinatorial HARQ processes; or,
Setting one of the groups of CCs to be assigned to a UE supporting a TM with two TBs, to allow two TBs to be simultaneously carried in the CC's subframes for each combined HARQ process; Establishing that one TB is allowed to be carried simultaneously in a subframe of the CC for each combined HARQ process when none of the groups of CCs is assigned to a UE supporting a TM having two TBs; or,
The number X of combinatorial HARQ processes is allowed to simultaneously carry two TBs in the subframe of the CC, and the remaining Mg-X HARQ processes are allowed to simultaneously transmit the subframes of the CC, , Wherein Mg is a total number of combinatorial HARQ processes set for the UE; or,
Setting the number of TBs allowed to be simultaneously carried in a subframe of the CC corresponding to the combination HARQ process ID based on the TM of the physical CC occupied by the most recent initial transmission of the combined HARQ ID.
19. The method of claim 18, wherein transmitting the data via the scheduled data channel comprises:
The data corresponding to the combined HARQ process ID consisting of one TB is mapped and transmitted on the CC adopting the TM composed of one TB, and the data corresponding to the combined HARQ process ID composed of the two TBs Mapping to a CC adopting a TM composed of two TBs to be transmitted; or,
The data corresponding to the combined HARQ process ID consisting of one TB is mapped and transmitted on the CC supporting the TM composed of one TB, and the data corresponding to the combined HARQ process ID composed of two TBs Setting to be mapped and transmitted on an arbitrary CC; or,
Comprising the steps of: setting data corresponding to a combined HARQ process ID composed of one TB to be mapped on an arbitrary CC and transmitting data corresponding to a combined HARQ process ID composed of two TBs to a TM To the CC that adopts the < RTI ID = 0.0 > CC < / RTI > or,
And setting the data corresponding to the combined HARQ process ID to be allowed to be mapped and transmitted on any CC.
19. The method of claim 18, wherein when the combined HARQ process adopts a TM comprised of one TB and the CC to which the scheduled data channel belongs adopts a TM consisting of two TBs, Wherein the TBs of the combined HARQ process are mapped to TBs that are allowed to be scheduled; For a normal DCI, the TB allowed to be scheduled by the scheduled data channel,
Determine a fixed TB of the CC to which the scheduled data channel belongs as a TB allowed to be scheduled; Determining a TB allowed to be scheduled according to the control information of the two TBs; And determining TB that is allowed to be scheduled according to the indication in the DCI format or higher layer signaling.
19. The method of claim 18, wherein the combined HARQ process employs a TM comprising two TBs, and when a CC to which the scheduled data channel belongs adopts a TM consisting of one TB, For example,
Determining a fixed TB of the combined HARQ process or TB identified by specific information as data to be transmitted on the scheduled data channel; or,
Determining a TB of a combined HARQ process identified by the indication in the DCI or higher layer signaling as data transmitted on the scheduled data channel; or,
Comparing the NDI in the current scheduled DCI to the NDI in the most recent transmission of the two TBs of the combined HARQ process; Determining a TB having the unmodified NDI as data to be transmitted on the scheduled data channel if only one of the two TBs does not change; Otherwise determining TB in the fixed TB or DCI of the combined HARQ process or TB of the combined HARQ process identified by the higher layer signaling as data transmitted on the scheduled data channel.
1. An apparatus for hybrid automatic repeat request (HARQ) transmission, comprising:
A configuration receiving module for receiving configuration information of a cross-carrier HARQ transmission transmitted by a base station;
A scheduling module for receiving the DCI transmitted by the base station and determining a data channel scheduled by the DCI;
And a data transmission / reception module for receiving downlink data or transmitting uplink data through a data channel determined by the scheduling module according to the setting information.
25. The method of claim 24,
Wherein the configuration receiving module receives a CC indication identifying a CC corresponding to the currently scheduled data and the data having the same CC indication is allowed to be transmitted on data channels belonging to different CCs,
Wherein the step of receiving the downlink data or transmitting the uplink data comprises applying a HARQ combination to the first transmission and retransmission of the same HARQ process identifier and data corresponding to the same CC indication, And is identified via a CC indication with an HARQ process ID.
26. The method of claim 25, wherein the CC indication is an index to one CC of the CCs allocated to the UE, or the CCs allocated to the UE are divided into a plurality of groups, When the HARQ transmission is performed, the CC indication is an index of a CC in the group to which the CC belongs.
26. The method of claim 25, wherein the CC identified by the CC indication adopts a transmission mode (TM) composed of one transport block (TB) and the CC to which the scheduled data channel belongs comprises a TM If adopted, the scheduling module,
Setting a data channel to be allowed to schedule data of one TB when transmitting the uplink data through the scheduled data channel, wherein the TB allowed to be scheduled by the normal DCI is a fixed TB among the two TBs, TB determined according to the control information of the two TBs in the DCI,
Determining a first one of the two TBs transmitted on the scheduled data channel as data of a CC identified by the CC indication and determining a second one of the two TBs as a CC Wherein the first TB is a fixed TB or a TB identified by information in upper layer signaling or DCI.
26. The method of claim 25, wherein if the CC identified by the CC indication adopts a TM consisting of two TBs and the CC to which the scheduled data channel belongs adopts a TM consisting of one TB, When transmitting the uplink data through a channel
The scheduling module determines that the uplink data is a fixed TB or a TB identified by specific information in the two TBs of the CC identified by the CC indicator,
Determine that the uplink data is TB identified by information in DCI or higher layer signaling in the two TBs of CC identified by the CC indicator,
Determine that the uplink data is the TB identified by the new data identifier (NDI) field in the DCI format in the two TBs of the CC identified by the CC indicator,
Compares the NDI in the current scheduled DCI with the NDI in the most recent transmission for the two TBs in the CC identified by the CC indicator and if only one NDI of the TB is not changed, As data to be transmitted on the scheduled data channel; Otherwise, it is determined that the data transmitted on the scheduled data channel is a fixed TB, or TB in the DCI in the two TBs of the CC identified by the CC indicator or identified by upper layer signaling .
28. The method of claim 25, wherein the CC identified by the CC indication is a CC occupied by a physical channel for initial transmission or retransmission of data identified by the CC, RTI ID = 0.0 > CC, < / RTI >
28. The method of claim 25 or 28, wherein, if the current scheduled data is an initial transmission, the index of the CC identified by the CC indication in the downlink control information indicates that the scheduled data channel belongs Equal to the index of CC; Wherein the CC identified by the CC indication is the CC occupied by the physical channel for the initial transmission of the data identified by the CC.
32. The method of claim 29 or 30, wherein the CC indication is transmitted via a newly defined field, or a customarily defined field of the DCI format in the downlink control information; Wherein the CC indication is sent in DCI format in a common search space, and the CC indication is valid for a plurality of consecutive subframes.
31. The method of claim 30, wherein if both the CC identified by the CC indication and the CC to which the scheduled data channel belongs adopt a TM comprised of two TBs,
Compares the NDI in the current scheduled DCI with the NDI in the most recent transmission for each of the two TBs in the CC identified by the CC indication, changes the NDI of one of the two TBs, If the NDI of the NDI is not changed, the data transmission / reception module that transmits data through the scheduled data channel transmits data transmitted through the scheduled data channel corresponding to the TB having the unmodified NDI to the CC indication Determines that the data transmitted through the scheduled data channel corresponding to the TB having the changed NDI is the first transmission of the data of the CC identified by the CC indication, or
Determining that the data transmitted through the scheduled data channel corresponding to the TB having the unaltered NDI is the retransmission of the data of the CC identified by the CC indication and transmitting the NDI of the currently scheduled DCI to the scheduled data channel The data transmitted through the scheduled data channel corresponding to the TB having the changed NDI is transmitted to the TB data of the CC to which the scheduled data channel belongs according to a result of comparison with the NDI of the most recent transmission of the TB in the CC to which the scheduled data channel belongs And judges that the transmission is the first transmission or retransmission.
32. The method of claim 30, wherein when the CC identified by the CC indication adopts a TM consisting of two TBs and the CC to which the scheduled data channel belongs adopts a TM consisting of one TB, The data transmission / reception module for transmitting data through a channel includes:
Comparing the NDI in the currently scheduled DCI with the NDI in the most recent transmission of the TB in the CC identified by the CC indication, and when the NDI of only one TB is not changed, Is a TB having the unmodified NDI.
25. The method of claim 24,
Wherein the VCC information for identifying a virtual component carrier (VCC) corresponding to the currently scheduled data is received by the setting reception module, and the data of the VCC is allowed to be transmitted through the PDSCHs of the other CCs And,
Wherein the HARQ process applies the HARQ combination for the initial transmission and retransmission of data having the same HARQ process ID and the same VCC when receiving the downlink data or transmitting the uplink data by the data transmission and reception module, Together identified by a VCC index.
35. The method of claim 34, wherein the VCC information is transmitted over a newly defined field or a customarily defined field of the DCI format in the downlink control information; Wherein the VCC information is transmitted in a DCI format in a common search space and the VCC information is valid for a plurality of consecutive subframes.
35. The method of claim 34, wherein the VCCs allocated to the UE have different index information;
Wherein when a total of N CCs assigned to the UE are divided into a plurality of groups and a cross-carrier HARQ transmission is performed within each group, the intra-group VCCs have different index information.
35. The method of claim 34, wherein if the scheduling module establishes a TM for each VCC of the UE,
Setting the number of TBs allowed to be transmitted simultaneously in a subframe in each VCC through upper layer signaling; or
Via higher layer signaling, set the same number of TBs that are allowed to be transmitted in a subframe for all VCCs; or
Predefining the number of TBs allowed to be transmitted simultaneously in a subframe in each VCC; or
When establishing each CC of the UE, specify whether the configuration information of each CC can be mapped to the configuration information of the VCC, wherein the TM of VCC is obtained from the TM of CC that can be mapped to VCC; or
If the CC in the group of CCs allocated to the UE adopts a TM composed of two TBs, each VCC is allowed to simultaneously carry two TBs in one subframe; Otherwise, set each VCC to be allowed to carry one TB simultaneously in one subframe in the CC; or
Defines the number X and sets each of the first X VCCs of all VCCs allocated to the UE to allow simultaneous carrying of two TBs in one subframe, and sets M to be the total number of VCCs allocated to the UE And sets the remaining MX VCCs to carry one TB simultaneously in one subframe.
35. The apparatus of claim 34, wherein the data transmission / reception module for transmitting data through the scheduled data channel comprises:
The data of the VCC adopting the TM consisting of one TB is mapped and transmitted on the CC adopting the TM composed of one TB and the data of the VCC adopting the TM composed of the two TBs is divided into two TBs TM to the CC that adopts the TM,
The data of VCC adopting a TM composed of one TB is mapped onto a CC adopting a TM composed of one TB and the data of the VCC adopting a TM composed of two TBs is mapped onto an arbitrary CC , Or
Mapping and transmitting data of VCC adopting TM consisting of one TB to arbitrary CC, mapping data of VCC adopting TM composed of two TBs onto CC adopting TM composed of two TBs ; or
And to allow data of each VCC to be mapped and transmitted on any CC.
35. The method of claim 34 wherein when the VCC adopts a TM comprised of one TB and the CC to which the scheduled data channel belongs adopts a TM consisting of two TBs, Wherein the TB of the VCC is mapped to the TB allowed to be scheduled; For a normal DCI, for a TB that is allowed to be scheduled by the scheduled data channel,
Determine a fixed TB of the CC to which the scheduled data channel belongs as a TB allowed to be scheduled;
Determining a TB allowed to be scheduled according to the control information of the two TBs;
And determining TB that is allowed to be scheduled according to the indication in the DCI format or higher layer signaling.
35. The method of claim 34, wherein when the VCC adopts a TM comprised of two TBs and the CC to which the scheduled data channel belongs adopts a TM comprised of one TB, Wherein the data transmission /
Determining the fixed TB of the VCC or the TB identified by the specific information as the data to be transmitted through the scheduled data channel,
Determining the indication identified in the DCI or the TB identified by the higher layer signaling as data transmitted on the scheduled data channel, or
Comparing the NDI in the current scheduled DCI to the NDI in the most recent transmission of the two TBs of the VCC; Determine TB with the unmodified NDI as data to be transmitted on the scheduled data channel if only one NDI of the two TBs is not changed; Otherwise determining TB in the fixed TB or DCI of the VCC or TB identified by the upper layer signaling as data to be transmitted on the scheduled data channel. The method of claim 24, wherein the configuration receiving module receives a combined HARQ process ID for identifying a combined HARQ process corresponding to the currently scheduled data, PDSCH < / RTI >
Wherein the data transmission / reception module for transmitting the uplink data or the downlink data applies the HARQ combination to the data corresponding to the combined HARQ process ID and to the retransmission of the data.
42. The method of claim 41, wherein the different HARQ processes have different HARQ IDs;
When the N CCs assigned to the UE are divided into a plurality of groups and a cross-carrier HARQ transmission is performed in each group, the same intra-group combination HARQ processes have different combined HARQ process IDs.
42. The scheduling module of claim 41, wherein the scheduling module for setting the TM for the combined HARQ processes of the UE via one CC comprises:
Through higher layer signaling, the number of TBs allowed to be simultaneously carried within a subframe of the CC for each combined HARQ process is set,
Through higher layer signaling, it is possible to set the same number of TBs allowed to be carried simultaneously in a subframe of the CC for all the combined HARQ processes,
It is possible to predefine the same number of TBs that are allowed to be simultaneously carried within a subframe of the CC for all the combined HARQ processes,
Setting one of the groups of CCs to be assigned to a UE supporting a TM with two TBs, allowing two TBs to be simultaneously carried within a subframe of the CC for each combined HARQ process; When none of the groups of CCs is assigned to a UE supporting a TM having two TBs, one TB is allowed to be carried simultaneously in a subframe of the CC for each combined HARQ process,
The number X of combinatorial HARQ processes is allowed to simultaneously carry two TBs in the subframe of the CC, and the remaining Mg-X HARQ processes are allowed to simultaneously transmit the subframes of the CC, , Wherein Mg is the total number of combinatorial HARQ processes set for the UE; or,
Sets the number of TBs allowed to be simultaneously carried in a subframe of the CC corresponding to the combination HARQ process ID based on the TM of the physical CC occupied by the most recent initial transmission of the combined HARQ ID.
42. The method of claim 41, wherein the data transmission / reception module for transmitting data through the scheduled data channel comprises:
The data corresponding to the combination HARQ process ID consisting of one TB is mapped and transmitted on the CC adopting the TM composed of one TB or the data corresponding to the combination HARQ process ID composed of the two TBs is mapped to two To be mapped onto a CC employing a TM composed of TBs to be transmitted; or,
The data corresponding to the combined HARQ process ID consisting of one TB is mapped and transmitted on the CC supporting the TM composed of one TB and the data corresponding to the combined HARQ process ID composed of the two TBs is transmitted CC and transmitted; or,
Comprising the steps of: setting data corresponding to a combined HARQ process ID composed of one TB to be mapped on an arbitrary CC and transmitting data corresponding to a combined HARQ process ID composed of two TBs to a TM To be transmitted on the CC adopting the CC; or,
And to allow data corresponding to the combined HARQ process ID to be mapped and transmitted on any CC.
42. The method of claim 41, wherein the scheduling module is configured such that when the combined HARQ process employs a TM configured with one TB and the CC to which the scheduled data channel belongs adopts a TM comprised of two TBs, The channel is configured to be allowed to schedule data of one TB and the TB of the combined HARQ process is mapped to a TB allowed to be scheduled; For a normal DCI, the TB allowed to be scheduled by the scheduled data channel,
If it is determined that TB is allowed to schedule the fixed TB of the CC to which the scheduled data channel belongs,
Or TB that is allowed to be scheduled according to the control information of the two TBs;
And determining TB that is allowed to be scheduled according to the indication in the DCI format or higher layer signaling.
42. The method of claim 41, wherein the combined HARQ process employs a TM comprised of two TBs, and when a CC to which the scheduled data channel belongs adopts a TM comprised of one TB, Wherein the data transmission /
Determining a fixed TB of the combined HARQ process or TB identified by specific information as data to be transmitted on the scheduled data channel; or
Determining a TB of a combined HARQ process identified by indication information in the DCI or by higher layer signaling as data transmitted on the scheduled data channel; or
Compare the NDI in the current scheduled DCI with the NDI in the most recent transmission of the two TBs of the combined HARQ process; Determining a TB having the unmodified NDI as data transmitted on the scheduled data channel if only one of the two TBs does not change; Otherwise, the TB of the combined HARQ process or the TB of the combined HARQ process identified by the information in the DCI or the upper layer signaling is determined as the data transmitted on the scheduled data channel.

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