CN110830218B

CN110830218B - User equipment and data transmission method and device thereof

Info

Publication number: CN110830218B
Application number: CN201810914417.7A
Authority: CN
Inventors: 张萌; 张飒
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2018-08-10
Filing date: 2018-08-10
Publication date: 2022-03-22
Anticipated expiration: 2038-08-10
Also published as: CN110830218A

Abstract

The data transmission method comprises the following steps: during the LBT transmission, detecting that LBT succeeds on only a portion of the plurality of subbands; determining the number of CBGs contained within each transport block; selecting a corresponding number of CBGs from CBGs required to be transmitted for transmission, wherein the UCI comprises a CBGTI which is used for indicating the CBGs transmitted and/or not transmitted; and in the process of carrying out subsequent transmission, carrying out PUSCH retransmission according to the HARQ-ACK field indicated by the base station, wherein the HARQ-ACK field is used for indicating the successful and/or failed CBG in the CBG transmitted by the user equipment before. The invention sets a reasonable transmission strategy for the condition that LBT succeeds on only part of sub-bands in a plurality of sub-bands in the unlicensed frequency band of the 5G new air interface, and improves the transmission reliability.

Description

User equipment and data transmission method and device thereof

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a user equipment and a data transmission method and apparatus thereof.

Background

The 5G new air interface (5GNR) is a global 5G standard designed based on a new air interface of an OFDM (Orthogonal Frequency Division Multiplexing) technology, and is also a basis of a next-generation cellular mobile communication technology, and the 5G new air interface has many advantages of lower time delay, higher reliability and the like. Recently, the independent networking standard of the fifth generation mobile communication technology 5G new air interface has been approved by the international standards organization 3GPP (third generation partnership project) conference.

A multi-carrier (multi) LBT (Listen-Before-Talk) scheme is defined in LTE LAA/eLAA/feLAA in two ways:

mode A: the base station performs CAT4LBT on each cc (component carrier).

A1: each CC independently maintains a respective backoff timer (backoff counter), in which case the backoff timer of each CC is reset if the base station decides to stop transmitting information on any one CC;

a2: all CCs share the same backoff timer, which corresponds to the backoff timer of the CC with the largest contention window (contention window) value.

Mode B: the base station selects 1 CC-j from a plurality of CCs, and the selection criterion is as follows: the base station selects 1 CC-j with a uniform distribution and the frequency of selection is no less than 1 second. On the selected CC-j, the base station uses CAT4, on other CCs, the time for possible transmission needs to be aligned with CC-j, and only one CAT2LBT (25us) needs to be performed after CAT4LBT of CC-j succeeds, transmission can be performed if the transmission is successful (in other words, CC-j cannot be directly transmitted after CAT4LBT of CC-j succeeds, and wait for 25us, CC-j does not need to be subjected to LBT within 25 us.

In addition, the duration of transmission on other CCs cannot exceed the maximum transmission duration configured on CC-j.

B1: contention window CWp is one where all CCs remain the same;

b2: the contention window CWp is maintained independently for each CC.

Currently, standardization work for unlicensed band (unlicensed band) of a 5G new air interface is in progress. In the unlicensed frequency band of the 5G new air interface, the user equipment can perform LBT (listen before talk) transmission on multiple subbands (subbands) according to the scheduling information of the base station (note that the LBT may be referred to as channel access), and due to uncertainty of the LBT process, it cannot be guaranteed that LBT succeeds on all subbands.

For the case that LBT succeeds only on a part of the subbands, there is no study in the prior art in this respect (i.e. related transmission strategies, such as possibly necessary signaling at the time of transmission and corresponding behavior of the user equipment or base station, etc.).

Disclosure of Invention

The technical problem solved by the invention is as follows: how to perform LBT transmission on multiple subbands in an unlicensed frequency band of a 5G new air interface.

In order to solve the above technical problem, an embodiment of the present invention provides a data transmission method, including:

according to configuration information from a base station, carrying out LBT transmission on a plurality of sub-bands in an unlicensed frequency band of a 5G new air interface;

during the LBT transmission, detecting that LBT succeeds on only a portion of the plurality of subbands;

determining the number of CBGs contained within each transport block;

and selecting the CBG with the corresponding number from the CBGs required to be transmitted for transmission according to the number of the CBGs contained in each transmission block. Optionally, the ue may transmit a UCI, where the UCI includes a CBGTI, and the CBGTI is used to indicate a CBG transmitted and/or not transmitted;

and in the process of carrying out subsequent transmission, carrying out PUSCH retransmission according to the HARQ-ACK field indicated by the base station, wherein the HARQ-ACK field is used for indicating the successful and/or failed CBG in the CBG transmitted by the user equipment before.

Optionally, the configuration information is carried by higher layer signaling (such as RRC signaling) or MAC-CE or PDCCH.

Optionally, the user equipment determines which sub-bands to use for LBT according to a location of UL resource scheduled by DL BWP, where the configuration information includes an uplink resource indication, MCS, and maxcodeblockackgrouppransportblock, where the maxcodeblockackgrouppransportblock is used to indicate an uplink maximum CBG number in each transport block, and the user equipment calculates a transport block size according to the uplink resource indication and the MCS.

Optionally, when the number of CBs is less than the maximum CBG number, the value of NrMaxCBG is equal to the number of CBs.

Optionally, the base station instructs, through a PDCCH or a higher layer signaling (such as RRC signaling), which subbands are used by the user equipment for LBT, and the configuration information includes indication information, where the indication information is used to instruct the user equipment to perform LBT subbands.

Optionally, the user equipment determines which sub-bands to perform LBT according to the frequency domain position of the uplink transmission resource configured by the base station.

Optionally, the user equipment determines the number of CBGs contained in each transport block by the following formula: max (floor (NrMaxCBG × nrlbtpasssub/nrallsub), 1), where NrMaxCBG is the maximum number of CBGs, nrlbtpasssub is the number of subbands where LBT succeeds, and nrallsub is the number of all subbands.

Optionally, when the base station configures uplink transmission, the number of CBGs included in each transmission block may be equal to or less than the number of subbands used for LBT of the user equipment, and when the base station configures uplink resources of the user equipment, the number of CBs included in each transmission block may be equal to or less than the number of subbands used for LBT of the user equipment.

Optionally, when the base station configures uplink transmission, the number of CBGs included in each transmission block is recorded as M, and when the user equipment uses the number N of subbands for LBT, it is assumed that K subbands LBT among the N subbands succeeds, and at this time, in the K subbands, the number of CBGs transmitted by the user equipment is max (floor (M × K/N), 1), where max (a, B) represents the maximum value between a and B, and floor (C) represents rounding down C.

In order to solve the above technical problem, an embodiment of the present invention further provides a data transmission device, including: the device comprises a transmission unit, a detection unit, a calculation unit and a selection unit; wherein:

a transmission unit, adapted to perform LBT transmission on multiple subbands in an unlicensed frequency band of a 5G new air interface according to configuration information from a base station;

a detecting unit adapted to detect that LBT succeeds on only a part of the plurality of subbands during the LBT transmission;

a calculation unit adapted to determine the number of CBGs contained within each transport block;

and the selecting unit is suitable for selecting the CBG with the corresponding number from the CBGs required to be transmitted for transmission according to the number of the CBGs contained in each transmission block. Optionally, the ue may transmit a UCI at the same time, where the UCI includes CBGTI, and the CBGTI is used to indicate CBG transmitted and/or not transmitted;

and the transmission unit is also suitable for carrying out PUSCH retransmission according to the HARQ-ACK field indicated by the base station in the process of carrying out subsequent transmission, wherein the HARQ-ACK field is used for indicating the successful and/or failed CBG in the CBG transmitted by the user equipment before.

Optionally, the base station indicates, through a PDCCH or a higher layer signaling, which subbands are used by the user equipment for LBT, where the configuration information includes indication information, and the indication information is used to indicate the user equipment to perform LBT subbands.

In order to solve the above technical problem, an embodiment of the present invention further provides a user equipment, where the user equipment supports an unlicensed frequency band of a 5G new air interface, and the user equipment further includes the data transmission device described above.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

in an unlicensed frequency band of a 5G new air interface, in the process of performing LBT transmission on multiple subbands, when it is detected that LBT succeeds on only part of the subbands in the multiple subbands, determining the number of CBGs included in each transmission block and selecting a corresponding number of CBGs for transmission, including CBGTIs used for indicating which CBGs are transmitted in UCI for transmission, and in the process of performing subsequent transmission, performing PUSCH retransmission according to HARQ-ACK fields fed back by a base station and used for indicating which CBGs are successfully/unsuccessfully transmitted, thereby formulating a reasonable transmission policy (for example, possible necessary signaling during transmission and corresponding behaviors of user equipment or the base station) for the case that LBT succeeds on only part of the subbands in the multiple subbands in the unlicensed frequency band of the 5G new air interface, and improving reliability of transmission.

Drawings

FIG. 1 is a flow chart of a data transmission method according to an embodiment of the present invention;

fig. 2 is a block diagram of a data transmission apparatus according to an embodiment of the present invention.

Detailed Description

As can be seen from the analysis in the background art, standardization of the unlicensed frequency band of the 5G new air interface is currently in progress. In the unlicensed frequency band of the 5G new air interface, the user equipment can perform LBT transmission on multiple subbands according to scheduling information of the base station, and due to uncertainty of an LBT process, it cannot be guaranteed that LBT can be successful on all subbands.

For the case where LBT succeeds only on a part of the subbands, there is no study in the prior art in this respect (i.e. related transmission strategies, such as possibly necessary signaling at the time of transmission and corresponding behavior of the user equipment or base station, etc.).

As a consensus, transmissions on unlicensed frequency bands should be based on certain LBT criteria. Currently, LBT is intended to be performed on an unlicensed band of a 5G new air interface using 20M (or approximately 20M, depending on the size of the PRB) bandwidth subbands.

For the situation that the uplink or downlink bandwidth configured by the base station for the ue exceeds 20M, the inventor makes a reasonable transmission policy (for example, necessary signaling and corresponding behavior of the ue or the base station during transmission) for the situation that LBT succeeds only on part of subbands in multiple subbands in the unlicensed band of the 5G new air interface by using a multicarrier LBT scheme in LTE LAA/eLAA/feLAA, determines the number of CBGs (Code Block groups) included in each transmission Block and selects the CBGs of the corresponding number for transmission in the process of LBT transmission on multiple subbands in the unlicensed band of the 5G new air interface, includes CBGTIs (CBG transmission information) for indicating which CBGs are transmitted in UCI for transmission in the subsequent process, and PUSCH retransmission is carried out according to the HARQ-ACK field fed back by the base station and used for indicating which CBG transmission succeeds/fails, so that the transmission reliability is improved.

In order that those skilled in the art will better understand and realize the present invention, the following detailed description is given by way of specific embodiments with reference to the accompanying drawings.

Example one

As described below, an embodiment of the present invention provides a data transmission method.

First, the data transmission method in this embodiment is applicable to an unlicensed frequency band of a 5G new air interface, and is generally applicable to user equipment for execution. We assume that the user equipment has adopted an uplink LBT strategy like in LTE LAA/eLAA/feLAA.

Referring to a flow chart of a data transmission method shown in fig. 1, the following detailed description is made through specific steps:

and S101, carrying out LBT transmission on a plurality of sub-bands in the unlicensed frequency band of the 5G new air interface.

The base station sends some configuration information to the user equipment, which may be carried by higher layer signaling (e.g. RRC) or MAC-CE or PDCCH.

And the user equipment performs LBT transmission on a plurality of sub-bands in the unlicensed frequency band of the 5G new air interface according to the configuration information from the base station.

In this process, the user equipment prepares for the encoding of the CBG assuming that all subbands can be transmitted.

Index of how does the user equipment know the sub-band that needs LBT? The following may be used:

the user equipment determines which sub-bands to use for LBT according to the location of UL resource scheduled by DL BWP, without the need for extra indication of sub-bands by the base station. In this case, the configuration information includes an Uplink resource indication (e.g., pusch (Physical Uplink Shared CHannel)/PUCCH (Physical Uplink Control CHannel)/srs (sounding Reference signal) resource), MCS, and maxcodeblockgrouppransportblock for indicating the maximum number of CBGs Uplink in each transport block, from which the user equipment can estimate the transport block size.

Alternatively, the base station may instruct the user equipment which sub-bands to use for LBT through a PDCCH (Physical Downlink Control Channel) or a higher layer signaling (e.g., RRC) or a MAC-CE. In this case, the configuration information includes indication information for indicating the user equipment to perform LBT sub-band.

Alternatively, the base station may instruct the user equipment which sub-bands to use for LBT through a joint indication method of higher layer signaling and MAC-CE. Wherein the higher layer signaling configures a candidate set of subbands, and then activates one or more subbands by MAC-CE.

Alternatively, the base station may also instruct the user equipment which subbands to use for LBT through a joint indication method of higher layer signaling and PDCCH. Wherein, the higher layer signaling configures a candidate set of one subband, and then activates one or more subbands through PDCCH.

The resources configured by the base station are distributed on multiple subbands, which may be a continuous resource allocation manner or an interlaced (interleaved) resource allocation manner, and the present invention is not limited thereto.

S102, detecting that the LBT succeeds on only partial sub-bands in the plurality of sub-bands.

During the LBT transmission, the user equipment detects that LBT succeeds on only a portion of the plurality of subbands.

S103, the number of CBGs included in each transport block is determined.

For example, assuming that the configuration information of the base station indicates the user equipment to perform LBT transmission on subband 1, subband 2, subband 3, and subband 4, the user equipment finds that LBT of only a part of the subbands can be transmitted after attempting LBT, such as LBT failure of subband 3.

At this time, the user equipment can perform PUSCH transmission only from subband 1, subband 2, and subband 4.

The number of CBGs that the user equipment can upload is 8 × (3/4) ═ 6.

The user equipment determines the number of CBGs contained within each transport block by the following formula: max (floor (NrMaxCBG) × nrlbtpasssub/nrallsub), 1), where max (a, B) denotes taking the maximum value between a and B, floor (C) denotes rounding down the logarithmic value C, NrMaxCBG is the maximum number of CBGs, nrlbtpasssub is the number of subbands where LBT succeeds, nrallsub is the number of all subbands, i.e. the maximum number of CBGs multiplied by the number of subbands where LBT succeeds divided by the rounding down of all subbands. Wherein, if the number of CBs (Code blocks ) is less than the maximum CBG number, the value of NrMaxCBG is equal to the number of CBs.

Furthermore, the possibility of round and ceil also needs to be considered:

the user equipment may determine the number of CBGs contained within each transport block by the following formula: max (NrMaxCBG. nrlbtpasssub/nrallsub), 1), where Max (a, B) represents taking the largest value between a and B, round (C) represents rounding the value C, NrMaxCBG is the maximum number of CBGs, nrlbtpasssub is the number of subbands where LBT succeeds, nrallsub is the number of all subbands, i.e. the maximum number of CBGs multiplied by the number of subbands where LBT succeeds divided by the number of all subbands. And if the number of the CBs is less than the maximum CBG number, the value of the NrMaxCGG is equal to the number of the CBs.

The user equipment may determine the number of CBGs contained within each transport block by the following formula: ceil (nmaxcbg. nrlbtpasssub/nrallsub), wherein ceil (C) denotes rounding up the value C, NrMaxCBG being the maximum number of CBGs, nrlbtpasssub being the number of subbands where LBT succeeds, nrallsub being the number of all subbands, i.e. the maximum number of CBGs multiplied by the number of subbands where LBT succeeds divided by the number of all subbands, rounded down. And if the number of the CBs is less than the maximum CBG number, the value of the NrMaxCGG is equal to the number of the CBs.

And S104, selecting a corresponding number of CBGs from the CBGs required to be transmitted for transmission, wherein the UCI comprises a CBGTI.

And the user equipment selects the CBG with the corresponding number from the CBGs required to be transmitted for transmission according to the number of the CBGs contained in each transmission block. Optionally, the UE may transmit one UCI at the same time, where the UCI includes CBGTI.

Wherein the CBGTI is used for indicating the CBG which is transmitted and/or not transmitted.

As described above, the user equipment in step S101 assumes that all sub-bands can be transmitted to prepare the encoding of CBGs, and the following method may be adopted to select 6 CBGs from 8 CBGs:

an 8-bit bitmap is set on a uci (pucch) band to indicate which CBGs are transmitted by the ue (for how the ue determines which CBGs are not transmitted to the ue).

For example, 11110011 may indicate that the CBG uploaded by the ue is CBG-0, CBG-1, CBG-2, CBG-3, CBG-6, CBG-7.

As an embodiment, the UCI carrying the CBGTI may be piggyback transmitted on PUSCH. Wherein, the UCI carrying the UL CBG-index may piggyback on the smallest (or largest) uplink resource of the subband index or may determine which subband the UCI specific piggyback is on based on the ue implementation. The uplink resource may refer to a PUSCH resource.

Or, the UCI carrying the CBGTI may be piggyback transmitted on the PUSCH. The UCI carrying the CBGTI may specifically piggyback on which PUSCH resources of the subband can be indicated by the PDCCH.

For example, the PDCCH may contain a field (field), which is a bit map (bitmap), where each bit of the bitmap corresponds to a subband. For example, 1011 can indicate that PUSCH on subband-3 and subband-4 can be used as UCI of which piggyback carries CBGTI, and subband-2 does not allow the piggyback to carry UCI of CBGTI.

Or, the UCI carrying the CBGTI may be piggyback transmitted on the PUSCH. Wherein, the UCI carrying CBGTI can piggyback on all successful sub-bands of LBT. The content of UCI carrying CBGTI of piggyback on each sub-band is the same.

Alternatively, UCI carrying CBGTI may also be transmitted on PUCCH resources for higher layer signaling (such as RRC configuration). Here, the PUCCH resource may be a PUCCH resource configured on a subband where LBT is successful. Optionally, the ue may select to set UCI piggyback on the smallest (or largest) uplink resource of the subband index. The uplink resource may refer to a PUSCH resource.

Or, the UCI carrying the CBGTI may also be transmitted on PUCCH resources indicated in the PDCCH. Here, the PUCCH resource may be a PUCCH resource configured on a subband where LBT is successful.

Or, the UCI carrying the CBGTI may also be transmitted on PUCCH resources indicated in the PDCCH. The base station can configure a plurality of groups of PUCCH resource sets through RRC, each group of PUCCH resources corresponds to one subband, and then the PDCCH indicates which PUCCH resource in the corresponding PUCCH resource set is selected on each subband to transmit UCI carrying CBGTI.

Or, the UCI carrying the CBGTI may also be transmitted on PUCCH resources indicated in the PDCCH. The base station can configure a group of PUCCH resource sets through RRC, each PUCCH resource corresponds to one subband, and then the PDCCH indicates which PUCCH resource is selected to be corresponding to each subband to transmit UCI carrying CBGTI.

Or, the UCI carrying the CBGTI may also be transmitted on a PUCCH resource indicated in the PDCCH or the higher layer signaling. Wherein, each successful sub-band of LBT transmits a same PUCCH content.

In another embodiment, some rules may also be predefined, such as counting from the CBG with the smallest index, and transmitting the CBG corresponding to the smallest 6 CBG indexes; or count from the CBG with the largest index, and transmit the CBGs corresponding to the largest 6 CBG indexes (in this case, it is not necessary for the UCI to carry CBGTI to indicate which CBGs are specifically sent by the UE).

For example, in the scenario of aul (autonomous uplink) transmission, the base station configures 4 subbands, where LBT of subband 1 and subband 3 fails and LBT of subband 0 and subband 2 succeeds.

The TBS determined by the user equipment according to the resource configured by the configured grant may be divided into 6 CBs, and each CB has the same size. The number of CBGs configured by the base station is 4. According to the grouping rules of protocol 38.213, CBG0 contains CB0, CB 1; CBG1 comprises CB2, CB 3; CBG2 comprises CB 4; CBG3 comprises CB 5.

The user equipment sends CBG0 and CBG2 of the transport block in the first slot, and the CBGTI indication is 1010; the user equipment sends CBG1, CBG3 for this transport block in the second slot, CBGTI indicated 0101. The advantage of this approach is that the code rate of the PUSCH is closest to the configured MCS.

Optionally, when the base station configures uplink transmission, the number of CBGs included in each transmission block may be divided by the number of subbands of the user equipment LBT.

Optionally, when the base station configures the uplink resource of the ue, the number of CBs included in each transmission block may be equal to or less than the number of subbands of the LBT of the ue.

Optionally, when the base station configures uplink transmission, and when the number M of CBGs included in each transmission block cannot completely divide the number N of subbands of the LBT of the user equipment, it is assumed that LBT of K subbands among the N subbands succeeds, and if M < K, the UE may select M subbands with the smallest subband number from the K subbands that succeed in LBT for uplink transmission.

Optionally, when the base station configures uplink transmission, and when the number M of CBGs included in each transmission block cannot completely divide the number N of subbands of the LBT of the user equipment, it is assumed that K subbands LBT among the N subbands succeeds, and if M < K, the UE may select M subbands based on implementation among the K subbands where LBT succeeds to perform uplink transmission.

Optionally, when the base station configures uplink transmission, and when the number M of CBGs included in each transmission block cannot divide the number N of subbands of the LBT of the user equipment, it is assumed that K subbands of the N subbands LBT are successful, and if M < K, the UE may transmit M CBGs in the K subbands where LBT is successful.

Optionally, when the base station configures uplink transmission, and when the number M of CBGs included in each transmission block cannot divide the number N of subbands of the LBT of the user equipment, it is assumed that K subbands of N subbands LBT are successful, and if M < N, the UE may transmit M CBGs in the K subbands where LBT is successful.

Optionally, when the base station configures uplink transmission, the number of CBGs included in each transmission block is recorded as M, and when the user equipment uses the number N of subbands used for LBT, it is assumed that K subbands LBT succeeds in N subbands, and if M >. N, the number of CBGs transmitted by the UE in K subbands is floor (M/N). K.

Optionally, when the base station configures uplink transmission, the number of CBGs included in each transmission block is recorded as M, and when the user equipment uses the number N of subbands used for LBT, it is assumed that K subbands LBT succeeds in N subbands, and if M > -N, the number of CBGs transmitted by the UE in K subbands is floor (M × K/N).

Optionally, when the base station configures uplink transmission, the number of CBGs included in each transmission block is recorded as M, and when the user equipment uses the number N of subbands for LBT, it is assumed that LBT succeeds for K subbands in the N subbands, and at this time, in the K subbands, the number of CBGs transmitted by the UE is max (floor (M × K/N), 1). Where max (A, B) represents the maximum between A and B, floor (C) represents the rounding down of C.

S105, in the process of carrying out subsequent transmission, PUSCH retransmission is carried out according to the HARQ-ACK field indicated by the base station.

And after receiving the PUSCH transmitted by the user equipment in an uplink manner, the base station indicates which transmission is successful and which transmission is failed in the CBG transmitted by the user equipment before through the HARQ-ACK field. Wherein, the CBG which is not transmitted by the user equipment is marked as 0 in the HARQ-ACK field.

For example, the base station configures 8 CBGs for 1 transport block, the ue initially transmits 6 CBGs, and if CBG-0, CBG-1, CBG-2, CBG-3, CBG-6, and CBG-7, the corresponding uplink CBGTI is 11110011.

The base station successfully decoded CBG-0, CBG-1, CBG-2, CBG-3, but CBG-6, CBG-7. The downlink HARQ-ACK bit correspondingly transmitted by the base station is 11110000. It can be seen that CBG-4, CBG-5 where the initial transmission has no transmission correspond to 0 in the HARQ-ACK bit.

Note: the uplink CBGTI is the same as the bit length of the downlink HARQ-ACK and the maximum CBG number configured by the base station (namely the network side).

And after receiving the downlink HARQ-ACK bit fed back by the base station, the user equipment performs PUSCH retransmission according to the HARQ-ACK field indicated by the base station in the subsequent transmission process.

Wherein the HARQ-ACK field is used to indicate successful and/or failed CBGs among CBGs previously transmitted by the user equipment.

Assuming that after receiving the downlink HARQ-ACK bit fed back by the base station, the number of CBGs calculated according to the formula in step S103 is not enough to send all CBGs fed back as NACK and CBGs that have not been transmitted before (which may be initial transmission or retransmission), at this time, the priority of CBG transmission may be:

the retransmitted CBG takes precedence;

or the initial CBG is prior;

or from small to large according to the CBG-index;

or from large to small according to the CBG-index;

or other order of priority.

The above description of the technical solution shows that: in this embodiment, in an unlicensed frequency band of a 5G new air interface, in a process of performing LBT transmission on multiple subbands, when it is detected that only LBT on part of the subbands succeeds in the multiple subbands, the number of CBGs included in each transmission block is determined and a corresponding number of CBGs is selected for transmission, CBGTIs used to indicate which CBGs are transmitted are included in UCI for transmission, and in a process of performing subsequent transmission, PUSCH retransmission is performed according to HARQ-ACK fields fed back by a base station and used to indicate which CBGs succeed/fail in transmission, so that a reasonable transmission policy (for example, possible necessary signaling during transmission and corresponding behaviors of user equipment or the base station) is formulated for a case that only LBT on part of the subbands succeeds in the multiple subbands in the unlicensed frequency band of the 5G new air interface, thereby improving reliability of transmission.

Example two

As described below, an embodiment of the present invention provides a data transmission apparatus.

Referring to fig. 2, a block diagram of a data transmission apparatus is shown.

The data transmission apparatus includes: a transmission unit 201, a detection unit 202, a calculation unit 203 and a selection unit 204; the main functions of each unit are as follows:

a transmission unit 201, adapted to perform LBT transmission on multiple subbands in an unlicensed frequency band of a 5G new air interface according to configuration information from a base station;

a detecting unit 202 adapted to detect that LBT succeeds on only a part of the plurality of subbands during the LBT transmission;

a calculation unit 203 adapted to determine the number of CBGs contained within each transport block;

a selecting unit 204, adapted to select a corresponding number of CBGs from the CBGs to be transmitted for transmission according to the number of CBGs included in each transport block. Optionally, the UE may transmit a UCI at the same time, where the UCI includes CBGTI, and the CBGTI is used to indicate CBG transmitted and/or not transmitted;

the transmission unit 201 is further adapted to perform PUSCH retransmission according to the HARQ-ACK field indicated by the base station during the subsequent transmission, where the HARQ-ACK field is used to indicate the successful and/or failed CBGs in the CBGs previously transmitted by the user equipment.

In particular implementations, the configuration information may be carried by higher layer signaling (such as RRC signaling) or MAC-CE or PDCCH.

In a specific implementation, the ue may determine which sub-bands to use for LBT according to a location of UL resource scheduled by DL BWP, where the configuration information may include an uplink resource indication, MCS, and maxcodeblock group per transport block, where the maxcodeblock group per transport block is used to indicate a maximum uplink CBG number in each transport block, and the ue may estimate a transport block size according to the uplink resource indication and MCS.

In a specific implementation, the base station may instruct, through a PDCCH or higher layer signaling (such as RRC signaling), which subbands are used by the user equipment for LBT, and the configuration information may include indication information, where the indication information is used to instruct the user equipment to perform LBT subbands.

In a specific implementation, the user equipment determines which subbands are subjected to LBT according to a frequency domain position of an uplink transmission resource configured by the base station.

In a specific implementation, the user equipment may determine the number of CBGs contained within each transport block by the following formula: max (floor (NrMaxCBG × nrlbtpasssub/nrallsub), 1), where NrMaxCBG is the maximum number of CBGs, nrlbtpasssub is the number of subbands where LBT succeeds, and nrallsub is the number of all subbands. Optionally, when the number of CBs is less than the maximum CBG number, the value of NrMaxCBG is equal to the number of CBs.

In a specific implementation, when the base station configures uplink transmission, the number of CBGs included in each transmission block can be divided by the number of subbands used for LBT of the user equipment, and when the base station configures uplink resources of the user equipment, the number of CBs included in each transmission block can be divided by the number of subbands used for LBT of the user equipment.

In a specific implementation, when the base station configures uplink transmission, the number of CBGs included in each transmission block is denoted as M, and when the number of subbands N used for LBT by the ue is N, it is assumed that K subbands LBT succeeds in N subbands, and at this time, in K subbands, the number of CBGs transmitted by the ue is max (floor (M × K/N), 1), where max (a, B) represents the maximum value between a and B, and floor (C) represents rounding down C.

EXAMPLE III

As described below, an embodiment of the present invention provides a user equipment. And the user equipment supports the unlicensed frequency band of the 5G new air interface.

The difference from the prior art is that the user equipment further comprises a data transmission device as provided in the embodiments of the present invention. Therefore, the user equipment can determine the number of CBGs contained in each transmission block and select a corresponding number of CBGs for transmission under the condition that only partial LBTs on subbands in the multiple subbands are successfully transmitted in the process of LBT transmission in the unlicensed frequency band of the 5G new air interface, include CBGTIs used for indicating which CBGs are transmitted in UCI for transmission, and perform PUSCH retransmission according to HARQ-ACK fields fed back by the base station and used for indicating which CBGs are successfully/unsuccessfully transmitted, so that a reasonable transmission strategy (for example, possible necessary signaling during transmission, corresponding behaviors of the user equipment or the base station, and the like) is formulated for the condition that only partial LBTs on subbands in the multiple subbands in the unlicensed frequency band of the 5G new air interface are successfully transmitted, and the reliability of transmission is improved.

Those skilled in the art will understand that, in the methods of the embodiments, all or part of the steps can be performed by hardware associated with program instructions, and the program can be stored in a computer-readable storage medium, which can include: ROM, RAM, magnetic or optical disks, and the like.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method of data transmission, comprising:

according to configuration information from a base station, carrying out listen-before-send (LBT) transmission on a plurality of subbands in an unlicensed frequency band of a 5G new air interface;

determining the number of Code Block Groups (CBGs) contained in each transport block;

according to the number of CBGs contained in each transmission block, selecting a corresponding number of CBGs from the CBGs required to be transmitted for transmission, wherein uplink control information UCI comprises code block group transmission information CBGTI, and the CBGTI is used for indicating the CBGs transmitted and/or not transmitted;

and in the process of carrying out subsequent transmission, carrying out PUSCH (physical uplink shared channel) retransmission according to a hybrid automatic repeat request-acknowledgement field HARQ-ACK field indicated by the base station, wherein the HARQ-ACK field is used for indicating successful/failed CBG in CBG transmitted by the user equipment before.

2. The data transmission method according to claim 1, wherein the configuration information is carried by a higher layer signaling or a medium access layer control element MAC-CE or a physical downlink control channel PDCCH.

3. The data transmission method of claim 1, wherein the user equipment determines which sub-bands to use for LBT according to a location of an uplink resource UL resource scheduled by a downlink carrier bandwidth part DL BWP, and the configuration information includes an uplink resource indication, a modulation and coding strategy MCS, and a maximum code block group maxcodeblockgrouppransportblock for each transport block, the maxcodeblockgrouppransportblock indicating a maximum number of uplink CBGs within each transport block, and the user equipment estimates a transport block size according to the uplink resource indication and the MCS.

4. The data transmission method of claim 1, wherein the base station indicates which subbands are used by the ue for LBT through PDCCH or higher layer signaling, and the configuration information includes indication information for indicating the subbands used by the ue for LBT.

5. The data transmission method of claim 1, wherein the UE determines which subbands are LBT according to a frequency domain position of an uplink transmission resource configured by the BS.

6. The data transmission method of claim 1, wherein the user equipment determines the number of CBGs contained in each transport block by the following formula: max (floor (nmaxcbg. nrlbtpasssub/nrallsub), 1), where NrMaxCBG is the maximum number of CBGs, nrlbtpasssub is the number of subbands where LBT succeeds, nrallsub is the number of all subbands, max (a, B) denotes the largest value between a and B, floor (C) denotes rounding down C.

7. The data transmission method of claim 1, wherein the number of CBGs contained in each transmission block is divisible by the number of subbands used for LBT of the user equipment when the base station configures the uplink transmission, and wherein the number of code blocks CB contained in each transmission block is divisible by the number of subbands used for LBT of the user equipment when the base station configures the uplink resources of the user equipment.

8. The data transmission method as claimed in claim 1, wherein when the base station configures uplink transmission, the number of CBGs included in each transmission block is denoted as M, and when the number of subbands used for LBT by the ue is N, it is assumed that LBT succeeds for K subbands in the N subbands, and at this time, in the K subbands, the number of CBGs transmitted by the ue is max (floor (M × K/N), 1), where max (a, B) represents the largest value between a and B, and floor (C) represents rounding down for C.

9. A data transmission apparatus, comprising: the device comprises a transmission unit, a detection unit, a calculation unit and a selection unit; wherein:

a selecting unit, adapted to select a corresponding number of CBGs from the CBGs to be transmitted for transmission according to the number of CBGs included in each transport block, where the UCI includes a CBGTI, and the CBGTI is used to indicate the CBGs to be transmitted and/or not transmitted;

and the transmission unit is also suitable for carrying out PUSCH retransmission according to the HARQ-ACK field indicated by the base station in the process of carrying out subsequent transmission, wherein the HARQ-ACK field is used for indicating the successful/failed CBG in the CBG transmitted by the user equipment before.

10. The data transmission apparatus of claim 9, wherein the configuration information is carried by higher layer signaling or MAC-CE or PDCCH.

11. The data transmission apparatus of claim 9, wherein the user equipment determines which sub-bands to use for LBT according to a location of UL resource scheduled by DL BWP, the configuration information includes an uplink resource indication, MCS, and maxcodeblockackgrouppransportblock for indicating a maximum number of CBGs uplink in each transport block, and the user equipment estimates the transport block size according to the uplink resource indication and MCS.

12. The apparatus for data transmission according to claim 9, wherein the base station indicates which subbands are used by the ue for LBT through PDCCH or higher layer signaling, and the configuration information includes indication information for indicating the subbands used by the ue for LBT.

13. The data transmission apparatus of claim 9, wherein the ue determines which subbands are LBT according to a frequency domain position of the uplink transmission resource configured by the base station.

14. The data transmission apparatus of claim 9, wherein the user equipment determines the number of CBGs contained within each transport block by the following formula: max (floor (nmaxcbg. nrlbtpasssub/nrallsub), 1), where NrMaxCBG is the maximum number of CBGs, nrlbtpasssub is the number of subbands where LBT succeeds, nrallsub is the number of all subbands, max (a, B) denotes the largest value between a and B, floor (C) denotes rounding down C.

15. The data transmission apparatus of claim 9, wherein the number of CBGs contained in each transmission block is divisible by the number of subbands used for LBT of the user equipment when the base station configures the uplink transmission, and wherein the number of CBs contained in each transmission block is divisible by the number of subbands used for LBT of the user equipment when the base station configures the uplink resources of the user equipment.

16. The data transmission device of claim 9, wherein when the base station configures uplink transmission, the number of CBGs included in each transmission block is denoted as M, and when the number of subbands used by the ue for LBT is N, it is assumed that K subbands from among the N subbands are successful in LBT, and at this time, in the K subbands, the number of CBGs transmitted by the ue is max (floor (M × K/N), 1), where max (a, B) represents the largest value between a and B, and floor (C) represents rounding down for C.

17. A user equipment, which supports an unlicensed frequency band of a 5G new air interface, and further comprises the data transmission apparatus according to any one of claims 9 to 16.