CN110677222A

CN110677222A - HARQ feedback method and device for PDSCH repeated transmission

Info

Publication number: CN110677222A
Application number: CN201810717734.XA
Authority: CN
Inventors: 司倩倩; 高雪娟
Original assignee: Telecommunications Science and Technology Research Institute Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-07-03
Filing date: 2018-07-03
Publication date: 2020-01-10
Anticipated expiration: 2038-07-03
Also published as: CN110677222B

Abstract

The application discloses a HARQ feedback method and device for PDSCH repeated transmission. HARQ feedback method and device for PDSCH repeated transmission. The method comprises the following steps: the terminal determines the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission; and the terminal determines the HARQ feedback position and the feedback codebook of the PDSCH according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration. By adopting the method and the device, the size of the semi-static feedback codebook can be reduced, so that the transmission performance of the system is improved.

Description

HARQ feedback method and device for PDSCH repeated transmission

Technical Field

The invention relates to the technical field of wireless communication, in particular to a method and a device for HARQ feedback of PDSCH repeated transmission.

Background

Currently, in 5G, a Physical Downlink Shared CHannel (PDSCH) may support repeated transmission in N slots (N may be 2, 4 or 8), and support Hybrid Automatic Repeat reQuest (HARQ) feedback based on a HARQ-ACK codebook.

An HARQ-ACK codebook (HARQ-ACK codebook) is an HARQ-ACK feedback sequence generated for downlink transmission of a PDSCH and is divided into a Semi-static codebook (Semi-static codebook) and a dynamic codebook (dynamic codebook). The Downlink transmission may include a PDSCH transmission and a Physical Downlink Control Channel (PDCCH) transmission indicating a release of a Downlink Semi-Persistent Scheduling (SRS) resource. When the PDSCH carries out repeated transmission, if the HARQ-ACK is fed back by using the semi-static codebook, the HARQ-ACK is fed back only to the last time slot in the N PDSCH transmission time slots.

For the PDSCH repeated transmission, when the last slot of the N PDSCH transmission slots is an uplink slot or a partial Orthogonal Frequency Division Multiplexing (OFDM) symbol occupied by the PDSCH is an uplink symbol, but there is available downlink transmission in the first N-1 slots, the last slot of the N PDSCH transmission slots is still counted in the semi-static feedback codebook, but actually the slot cannot actually transmit the PDSCH, so there are redundant information bits in the HARQ-ACK codebook.

Disclosure of Invention

The embodiment of the application provides a HARQ feedback method and device for PDSCH repeated transmission.

In a first aspect, a method for HARQ feedback of PDSCH repeated transmission is provided, the method comprising: the terminal determines the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission; and the terminal determines the HARQ feedback position and the feedback codebook of the PDSCH according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration.

In a possible implementation manner, in the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration, symbols allocated to PDSCH transmission all correspond to downlink transmission symbols of the semi-static downlink configuration or flexible transmission symbols.

In a possible implementation manner, the determining, by the terminal, the HARQ feedback position of the PDSCH according to the last PDSCH transmission timeslot that does not conflict with the semi-static uplink/downlink configuration includes: the terminal determines the last symbol of the PDSCH transmission in the PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration as the end position of the PDSCH repeated transmission; and the terminal determines the transmission time slot of the HARQ feedback information of the PDSCH according to the end position of the PDSCH repeated transmission and the feedback timing relation between the PDSCH and the corresponding HARQ-ACK.

In a possible implementation manner, the determining, by the terminal, the HARQ feedback codebook of the PDSCH according to the last PDSCH transmission timeslot that does not conflict with the semi-static uplink/downlink configuration includes: the terminal maps HARQ-ACK feedback information corresponding to the PDSCH repeated transmission in an HARQ feedback codebook of the PDSCH and at a bit position corresponding to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration; wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the terminal combines the received HARQ-ACK feedback information repeatedly transmitted by the PDSCH for many times to obtain the feedback information.

In a possible implementation manner, in the HARQ feedback codebook, corresponding information is mapped to NACK at a corresponding bit position of the PDSCH retransmission timeslot other than the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration.

In a second aspect, a HARQ feedback method for PDSCH repeated transmission is provided, the method comprising: the base station schedules PDSCH for repeated transmission; and the base station receives a PDSCH HARQ feedback codebook sent by the terminal, wherein the PDSCH HARQ feedback codebook and the feedback position are determined by the terminal according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission.

In a possible implementation manner, the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration is determined according to the following manner: determining the last symbol of the PDSCH transmission in the PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration as the end position of the PDSCH repeated transmission; and determining the transmission time slot of the HARQ feedback information of the PDSCH according to the end position of the PDSCH repeated transmission and the feedback timing relation between the PDSCH and the corresponding HARQ-ACK.

In a possible implementation manner, in the HARQ feedback codebook of the PDSCH, HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is mapped on a bit position corresponding to the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration; wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the feedback information is obtained after the HARQ-ACK feedback information which is repeatedly transmitted by the PDSCH and received by the terminal is combined.

In a third aspect, a terminal is provided, which includes: a determining module, configured to determine a last PDSCH transmission timeslot that does not conflict with semi-static uplink and downlink configuration in PDSCH repeated transmission; and the feedback module is used for determining the HARQ feedback position and the feedback codebook of the PDSCH according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration.

In a fourth aspect, a base station is provided, which includes: a transmission module, configured to schedule PDSCH repeated transmission; and the receiving module is used for receiving a PDSCH HARQ feedback codebook sent by a terminal, wherein the PDSCH HARQ feedback codebook and the feedback position of the PDSCH are determined by the terminal according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission.

In a fifth aspect, a communication apparatus is provided, including: a processor, a memory, and a transceiver; the transceiver is used for transceiving data according to the instruction of the processor, and the processor is used for reading the program in the memory and executing: determining the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission; and determining the HARQ feedback position and the feedback codebook of the PDSCH according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration.

In one possible implementation, the processor is specifically configured to: determining the last symbol of the PDSCH transmission in the PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration as the end position of the PDSCH repeated transmission; and determining the transmission time slot of the HARQ feedback information of the PDSCH according to the end position of the PDSCH repeated transmission and the feedback timing relation between the PDSCH and the corresponding HARQ-ACK.

In one possible implementation, the processor is specifically configured to: mapping HARQ-ACK feedback information corresponding to the PDSCH repeated transmission in a HARQ feedback codebook of the PDSCH at a bit position corresponding to the last PDSCH transmission time slot which does not conflict with semi-static uplink and downlink configuration; wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the terminal combines the received HARQ-ACK feedback information repeatedly transmitted by the PDSCH for many times to obtain the feedback information.

In a sixth aspect, a communication apparatus is provided, including: a processor, a memory, and a transceiver; the transceiver is used for transceiving data according to the instruction of the processor, and the processor is used for reading the program in the memory and executing: scheduling, by the transceiver, PDSCH repeat transmissions; and receiving the HARQ feedback codebook of the PDSCH sent by the terminal through the transceiver, wherein the HARQ feedback codebook and the feedback position of the PDSCH are determined by the terminal according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission.

In a seventh aspect, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing the computer to perform the method of any of the above first aspects.

In an eighth aspect, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing the computer to perform the method of any of the second aspects above.

According to the embodiments of the present application, since the HARQ feedback position and the feedback codebook are determined according to the last PDSCH transmission timeslot where the PDSCH repeated transmission does not conflict with the semi-static uplink and downlink configuration, the size of the semi-static feedback codebook can be reduced, thereby improving the transmission performance of the system.

Drawings

Fig. 1 is a schematic diagram of a scheduling timing relationship between a PDSCH and a PDCCH and a feedback timing relationship between the PDSCH and its corresponding HARQ-ACK in a conventional 5G system;

fig. 2 is a schematic diagram of an HARQ feedback process of PDSCH repeated transmission implemented at a terminal side according to an embodiment of the present application;

fig. 3 is a schematic diagram of an HARQ feedback process of PDSCH repeated transmission implemented on a base station side according to an embodiment of the present application;

fig. 4 is a schematic diagram of semi-static uplink and downlink configuration of a radio frame and a feedback timing relationship between a PDSCH and a corresponding HARQ-ACK in a scenario one in the embodiment of the present application;

fig. 5 is a diagram illustrating mapping of PDSCH transmission and HARQ-ACK information in scenario one in the embodiment of the present application;

fig. 6 is a schematic diagram of semi-static uplink and downlink configuration of a radio frame and a feedback timing relationship between a PDSCH and a corresponding HARQ-ACK in scenario two in the embodiment of the present application;

fig. 7 is a diagram illustrating PDSCH transmission and HARQ-ACK information mapping in scenario two in the embodiment of the present application;

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a base station according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device according to another embodiment of the present application.

Detailed Description

The embodiment of the application can be applied to a 5G system or an evolution system thereof. The embodiment of the present application is described by taking a 5G system as an example, unless otherwise stated.

In order to more clearly understand the embodiments of the present application, the following briefly introduces the contents related to the embodiments of the present application in the 5G system in four aspects.

First aspect, scheduling and feedback timing in NR

The 5G NR system supports flexible timing relationships. For PDSCH, the PDCCH carrying its Scheduling information indicates the Scheduling timing relationship (Scheduling timing) between the PDSCH and the PDCCH and the feedback timing relationship (HARQ-ACK timing) between the PDSCH to its corresponding HARQ-ACK.

Specifically, a time domain resource allocation indication field in a Downlink Control Information (DCI) format used by the PDCCH indicates a time slot offset K0 between a time slot in which the PDSCH is located and a time slot in which the DCI is located, and a HARQ-ACK feedback timing indication field indicates a number of time slots K1 from the PDSCH to the HARQ-ACK. As shown in fig. 1, K0 is 0, indicating that PDSCH and DCI are in the same slot (slot n); k1 is 4, and indicates that the 4 th slot (slot n +4) after the slot in which the PDSCH is located is the feedback slot of HARQ-ACK.

There are two formats for DCI scheduling PDSCH: one is DCI format 1_0, and the other is DCI format 1_ 1. The DCI format 1_0 is fallback (fallback) DCI, the corresponding K1 set is fixed to {1,2,3,4,5,6,7,8}, the DCI format 1_1 is a non-fallback DCI format, and the corresponding K1 set is at most 8 values selected from the maximum K1 set and needs to include at least the values of {0,1,2,3,4,5,6,7 }. K1 may indicate a value to the terminal through an X-bit time domain resource allocation indication field (e.g. HARQ-ack timing indication field) in DCI, where X is ceil (log2(# number of RRC configured HARQ timing values)), so the K1 value may be dynamically changed. ceil denotes rounding up.

Second aspect, HARQ feedback in NR

Semi-static (semi-static) and dynamic (dynamic) HARQ-ACK codebook (codebook) generation modes are supported in the 5G NR system. The HARQ-ACK codebook is a HARQ-ACK feedback sequence generated for downlink transmission performing HARQ-ACK feedback on the same time domain position or uplink channel. The downlink transmission comprises a PDSCH and a PDCCH indicating the release of downlink SPS resources, and the PDCCH indicating the release of downlink SPS resources may also be referred to as SPS PDSCH release indication.

The semi-static codebook can determine a position set Mc of downlink transmission corresponding to HARQ-ACK feedback in the same time slot n on each carrier c according to the HARQ-ACK timing value in the K1 set, and then can determine the HARQ-ACK codebook transmitted in the time slot n according to the Mc. Specifically, the time slot for HARQ-ACK feedback in the corresponding time slot n is determined according to each value of K1, and in each of the time slots, the maximum number of downlink transmissions in a time division multiplexing mode (TDM) in one time slot is further determined according to various time domain positions in the pre-configured downlink time domain resource allocation information. For example, if a semi-static uplink and downlink timeslot structure is configured, an uplink symbol exists in a transmission position in a timeslot determined according to one downlink time domain resource allocation information, and the downlink transmission does not actually occur due to uplink and downlink resource collision, so that the transmission position is not counted (i.e., not used for downlink transmission), and only when it is satisfied that all symbols determined according to the downlink time domain resource allocation information in a timeslot are downlink symbols or flexible symbols, it is indicated that the downlink transmission may exist in the timeslot, so that the maximum number of downlink transmissions for TDM transmission is determined in downlink transmissions that may exist in a timeslot. And in the same way, determining the total downlink transmission number in the plurality of time slots which are obtained according to K1 and correspond to the time slot n for HARQ-ACK feedback as Mc, and determining a semi-static HARQ-ACK codebook transmitted in the time slot n according to the Mc, wherein the semi-static HARQ-ACK codebook comprises the size of the codebook and the specific content and sequence of HARQ-ACK information.

(III) third aspect, PDSCH repeated Transmission in NR

The PDSCH repeated transmission is supported in the 5G NR system, and the transmission performance of the PDSCH is improved by transmitting different redundancy versions of the same PDSCH through a plurality of continuous time slots. The repetition number N is configured by system high layer signaling, and the value of N may be 2, 4, or 8.

In the repeated transmission process, the time domain position of each PDSCH in the transmission time slot is the same. And in a plurality of continuous time slots, if partial or all symbols of the PDSCH in any time slot are determined to be uplink symbols according to the semi-static uplink and downlink configuration, the PDSCH in the time slot is not transmitted.

When a semi-static codebook is used for HARQ-ACK feedback, if a semi-static uplink and downlink time slot structure is configured, for the last time slot in N times of repeated transmission of a PDSCH, determining that uplink symbols exist in the time slot and the transmission positions in the previous continuous N-1 time slots according to downlink time domain resource allocation information, and the transmission positions where the uplink symbols exist are not counted in the HARQ feedback codebook.

(fourth) aspect, timeslot Structure configuration in NR

In the 5G NR system, a base station semi-statically configures a time slot structure in one period through high-level signaling, wherein the time slot structure comprises the number of downlink symbols, the number of uplink symbols and the number of flexible symbols used in each time slot. In a symbol set configured as a downlink, a terminal can only receive a downlink channel or signal, and in a symbol set configured as an uplink, a terminal can only transmit an uplink channel or signal.

If the terminal is not configured with a Slot Format Indicator (SFI), in the flexible symbol, the terminal may perform uplink transmission or downlink reception according to the detected DCI indicator. If the base station configures the terminal to perform downlink reception in the flexible symbol through the high-level signaling, the terminal may perform downlink reception in the flexible symbol only when the terminal does not detect the DCI indicating uplink transmission in the corresponding symbol or when the terminal detects the DCI indicating uplink transmission in the corresponding symbol but cannot meet the processing delay.

If the terminal is configured to detect SFI, the terminal does not expect uplink and downlink collision of the detected DCI indication and SFI indication in the flexible symbol. The terminal can perform uplink transmission or downlink reception according to the detected DCI indication, and if the base station configures the terminal to perform downlink reception in the flexible symbol through the high-level signaling, the terminal performs downlink reception in the flexible symbol only when the terminal detects that the symbol corresponding to the SFI indication is downlink.

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 2, a HARQ feedback process of PDSCH repeated transmission implemented by a terminal side according to an embodiment of the present application is provided. As shown, in the case of configuring a terminal to use PDSCH repeated transmission, the HARQ feedback process of the terminal may include:

s201: and the terminal determines the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission.

And in the last PDSCH transmission time slot which is not conflicted with the semi-static uplink and downlink configuration, the symbols allocated to PDSCH transmission correspond to downlink transmission symbols or flexible transmission symbols of the semi-static downlink configuration.

S202: and the terminal determines the HARQ feedback position and the feedback codebook of the PDSCH according to the determined last PDSCH transmission time slot which is not conflicted with the semi-static uplink and downlink configuration.

Optionally, when determining the HARQ feedback position of the PDSCH, the terminal may determine the last PDSCH transmission symbol in the PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration as the end position of the PDSCH retransmission, and determine the transmission timeslot of the HARQ feedback information of the PDSCH according to the end position of the PDSCH retransmission and the feedback timing relationship between the PDSCH and the corresponding HARQ-ACK (the feedback timing relationship is used to indicate the number of timeslots from the first PDSCH transmission to the HARQ-ACK).

The feedback timing relationship between the PDSCH and the corresponding HARQ-ACK, that is, the number of slots between the slot where the first PDSCH transmission is located in the PDSCH repeated transmission and the HARQ-ACK feedback slot corresponding to the PDSCH transmission, may be represented by K1, and K1 may be indicated to the terminal through DCI. The time slot position of the first PDSCH transmission in the PDSCH repeated transmission can be determined by the scheduling timing relation between the PDSCH and the PDCCH. The scheduling timing relationship between the PDSCH and the PDCCH is used to indicate the slot offset between the PDSCH slot and the DCI slot, and may be denoted by K0, and K0 may be indicated to the terminal through DCI.

Optionally, when determining the HARQ feedback codebook of the PDSCH, the terminal may map HARQ-ACK feedback information corresponding to the PDSCH repeated transmission at a bit position corresponding to the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration in the HARQ feedback codebook of the PDSCH. Wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the terminal combines the received HARQ-ACK feedback information repeatedly transmitted by the PDSCH for many times to obtain the feedback information.

Further, in the HARQ feedback codebook, corresponding information is mapped to NACK at a corresponding bit position of the PDSCH retransmission timeslot other than the last PDSCH transmission timeslot that does not collide with the semi-static uplink/downlink configuration.

Further, the above process may further include the following steps:

s203: and the terminal sends the determined feedback codebook at the determined HARQ feedback position of the PDSCH.

Referring to fig. 3, a HARQ feedback process for PDSCH repeated transmission implemented on the base station side according to the embodiment of the present application may include, as shown in the figure:

s301: the base station schedules the PDSCH for repeated transmissions.

S302: and the base station receives the HARQ feedback codebook of the PDSCH sent by the terminal.

The base station can determine the receiving condition of the terminal for the PDSCH according to the received HARQ feedback codebook.

The method for the terminal to feed back the HARQ feedback codebook of the PDSCH to the base station and the content of the HARQ feedback codebook of the PDSCH can be referred to the foregoing embodiments, and are not repeated here.

According to the embodiments of the present application, the HARQ feedback position and the feedback codebook are determined according to the last PDSCH transmission timeslot where the PDSCH repeated transmission does not conflict with the semi-static uplink and downlink configuration, so that the size of the semi-static feedback codebook can be reduced, and the transmission performance of the system can be improved.

In order to more clearly understand the embodiments of the present application, two scenarios are taken as examples, and the implementation process of the embodiments of the present application is described in detail below.

Scene one

As shown in fig. 4, in a wireless frame i, according to semi-static uplink and downlink configuration, a terminal may determine that slot { n, n +1, n +5, n +6} is a downlink transmission slot, slot { n +3, n +4, n +8, n +9} is an uplink transmission slot, and all OFDM symbols in slot { n +2, n +7} are flexible symbols.

In the scene, the base station configures 8 HARQ-ACK timing relationship (HARQ-acktiming) values for the terminal on the current carrier, that is, the K1 set is {2,3,4,5,6,7,8,9}, and then the PDSCH transmission slot for HARQ-ACK feedback in slot n +9 includes slot { n, n +1, n +2, n +3, n +4, n +5, n +6, n +7 }. The slot n +3 and slot n +4 are uplink slots, which cannot perform downlink transmission and need to be excluded from the HARQ feedback codebook. In this scenario, the HARQ feedback codebook is a semi-static codebook (semi-static codebook).

In the scene, the terminal capability only supports that only one PDSCH exists in each slot, and the number of PDSCH transmission slots corresponding to HARQ-ACK feedback in slot n +9 on the current carrier is Mc-6, where each PDSCH corresponds to one of Mc locations. The correspondence is determined simultaneously in the process of determining the number of downlink transmissions.

The high layer signaling configures a PDSCH in advance for repeat transmission, where the repeat number is a, that is, the PDSCH carrying the same Transport Block (TB) needs to be repeat transmitted a times. If the transmission is repeated in units of slots, each transmission is made in a slot containing enough downlink symbols or flexible symbols. The time slot in which the first PDSCH is transmitted is determined according to the scheduling of the PDCCH, for example, according to the time slot offset K0 between the time domain of the PDSCH indicated in the time domain resource allocation indication field in the DCI and the time slot of the DCI. And the time domain resource of the PDSCH in one time slot is determined according to the scheduling of the PDCCH, in the repeated transmission process, the time domain position of each PDSCH in the transmission time slot is the same, and the repeated transmission is carried out in the time slot which is started from the first time slot and subsequently meets the time domain resource allocation of the PDSCH in the time slot. It is of course not excluded that repeated transmission may also be performed within a time slot, for example, when the number of symbols allocated to one PDSCH is small. In the embodiment of the present application, only the repeated transmission in the unit of time slot is described as an example.

In the scene, as shown in fig. 5, the terminal is not configured with the SFI, the number of times of repeated transmission of the PDSCH is configured to be 4, the first transmission of the first scheduled dynamic PDSCH is in slot n, and the repeated transmission is sequentially performed in subsequent slots n +1 and n + 2. Since slot n +3 is an uplink transmission slot, the PDSCH repeat transmission in slot n +3 is discarded. The first transmission of the second scheduled dynamic PDSCH is in slot n +5, and the repeated transmissions of the PDSCHs in subsequent slots n +6 and slot n +7 are sequentially performed, and since slot n +8 is an uplink transmission slot, the repeated transmission of the PDSCHs in slot n +8 is abandoned, and then:

(1) for the first scheduled dynamic PDSCH repeated transmission, according to S201 in the flow shown in fig. 2, the terminal determines that the last PDSCH transmission slot that does not collide with the semi-static uplink and downlink configuration is slot n +2, and therefore determines that the feedback slot of HARQ-ACK is the seventh slot after slot n +2, that is, slot n +9, according to slot n +2 and K1 indicated by DCI — 7;

(2) for the second scheduled dynamic PDSCH repeated transmission, according to S201 in the flow shown in fig. 2, the terminal determines that the last PDSCH transmission slot that does not collide with the semi-static uplink and downlink configuration is slot n +7, so that the terminal determines that the feedback slot of the HARQ-ACK is the second slot after slot n +7, that is, slot n +9, according to the last transmission symbol in slot n +7 (assuming that PDSCH transmission occupies 14 symbols in each slot) and DCI indicated K1 ═ 2.

According to S202 in the flow shown in fig. 2, when the terminal performs HARQ feedback, because the number of PDSCH transmission slots is

Mc

6, 6 bits of feedback information are generated in total, each bit corresponds to one PDSCH transmission slot, where the first bit corresponds to slot n, the second bit corresponds to slot n +1, the third bit corresponds to slot n +2, the fourth bit corresponds to slot n +5, the fifth bit corresponds to slot n +6, and the sixth bit corresponds to slot n + 7.

Because the last time slot of the first scheduled repeated transmission of the PDSCH, which is not conflicted with the semi-static uplink and downlink configuration, corresponding to the PDSCH transmission is slot n +2, the terminal maps the final HARQ-ACK information of the first scheduled dynamic PDSCH after the actual 3 times of repetition on the bit position corresponding to slot n +2 in the HARQ feedback codebook.

Because the last time slot of the first scheduled repeated transmission of the PDSCH, which is not conflicted with the semi-static uplink and downlink configuration, corresponding to the PDSCH transmission is slot n +7, the terminal maps the final HARQ-ACK information of the second scheduled dynamic PDSCH after the actual 3 times of repetition on the bit position corresponding to slot n +7 in the HARQ feedback codebook.

And directly mapping NACK on bit positions corresponding to other downlink transmissions in the HARQ feedback codebook. Therefore, the HARQ feedback codebook generated by the terminal in slot N +9 is { N, N, A/N for slot N +2, N, N, A/N for slot N +7 }.

Scene two

As shown in fig. 6, in a wireless frame i, according to semi-static uplink and downlink configuration, it may be determined that slot { n, n +1} is a downlink transmission slot, slot { n +8, n +9} is an uplink transmission slot, and all OFDM symbols in slot { n +2, n +3, n +4, n +5, n +6, n +7} are flexible symbols.

In scenario two, the base station configures 8 timing relationship (HARQ-ACK timing) values for the terminal on the current carrier, that is, the K1 set is {2,3,4,5,6,7,8,9}, and then the PDSCH transmission slot for performing HARQ-ACK feedback in slot n +9 includes slot { n, n +1, n +2, n +3, n +4, n +5, n +6, n +7 }.

In scenario two, the terminal capability only supports that only one PDSCH exists in each slot, and the number of PDSCH transmission slots corresponding to HARQ-ACK feedback in slot n +9 on the current carrier is Mc-8, where each PDSCH corresponds to one of Mc locations. The correspondence is determined simultaneously in the process of determining the number of downlink transmissions.

The high layer signaling configures PDSCH in advance for repeat transmission, the repeat times are A, namely the PDSCH carrying the same TB needs to be transmitted repeatedly A times. If the transmission is repeated in units of slots, each transmission is made in a slot containing enough downlink symbols or flexible symbols. The time slot in which the first PDSCH is transmitted is determined according to the scheduling of the PDCCH, for example, according to the time slot offset K0 between the time domain of the PDSCH indicated in the time domain resource allocation indication field in the DCI and the time slot of the DCI. And the time domain resource of the PDSCH in one time slot is determined according to the scheduling of the PDCCH, in the repeated transmission process, the time domain position of each PDSCH in the transmission time slot is the same, and the repeated transmission is carried out in the time slot which is started from the first time slot and subsequently meets the time domain resource allocation of the PDSCH in the time slot. It is of course not excluded that repeated transmission may also be performed within a time slot, for example, when the number of symbols allocated to one PDSCH is small. In the embodiment of the present application, only the repeated transmission in the unit of time slot is described as an example.

In scenario two, as shown in fig. 7, the base station configures the terminal to detect SFI, configures PDSCH repeat transmission times as 8, and indicates that slot { n +2, n +3, n +4, n +5} is a downlink transmission slot, and indicates that slot n +6 is a flexible symbol, and indicates that slot n +7 is an uplink transmission slot. If the first transmission of the SPS PDSCH is in slot n, then the subsequent repeated transmission is performed in slot { n +1, n +2, n +3, n +4, n +5}, and since the SFI indicates that slot n +6 and slot n +7 do not include downlink transmission symbols, the repeated transmission of the PDSCH in slot n +6 and slot n +7 is discarded, and then:

according to S201 in the flow shown in fig. 2, the terminal determines that the last PDSCH transmission slot that is not conflicted with the semi-static uplink and downlink configuration and is repeatedly transmitted by the PDSCH is slot n +7, and therefore determines the feedback position of HARQ-ACK according to slot n +7 and K1 indicated by DCI. Assuming that the base station indicates a value of K1 of 2 when activating SPS PDSCH, the feedback slot for HARQ-ACK is slot n + 9.

According to S202 in the flow shown in fig. 2, when the terminal performs HARQ feedback, because the number of PDSCH transmission slots is Mc-8, 8 bits of feedback information are generated in total, each bit corresponds to one PDSCH transmission slot, where the first bit corresponds to slot n, the second bit corresponds to slot n +1, the third bit corresponds to slot n +2, the fourth bit corresponds to slot n +3, the fifth bit corresponds to slot n +4, the sixth bit corresponds to slot n +5, the seventh bit corresponds to slot n +6, and the eighth bit corresponds to slot n + 7.

Because the last time slot of the SPS PDSCH repeated transmission, which is not conflicted with the semi-static uplink and downlink configuration, corresponding to the PDSCH transmission is slot n +7, the terminal maps the final HARQ-ACK information of the SPS PDSCH after the SPS PDSCH is actually repeated for 6 times on the bit position corresponding to slot n +7 in the HARQ feedback codebook. And directly mapping NACK on bit positions corresponding to other downlink transmissions in the HARQ feedback codebook. Therefore, the HARQ feedback codebook generated by the terminal in slot N +9 is { N, N, N, N, N, N, N, A/N for SPS PDSCH }.

Based on the same technical concept, the embodiment of the present application further provides a terminal, which can implement the HARQ feedback process of PDSCH repeated transmission implemented on the terminal side described in the foregoing embodiment.

Referring to fig. 8, a structure of a terminal according to an embodiment of the present application is provided. The terminal may include: a determination module 801 and a feedback module 802.

The determining module 801 is configured to determine a PDSCH transmission timeslot in which the last PDSCH transmission timeslot does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission; the feedback module 802 is configured to determine a HARQ feedback position and a feedback codebook of the PDSCH according to the last PDSCH transmission timeslot that does not conflict with the semi-static uplink/downlink configuration.

Optionally, in the last PDSCH transmission timeslot without colliding with the semi-static uplink and downlink configuration, the symbols allocated to PDSCH transmission all correspond to downlink transmission symbols or flexible transmission symbols of the semi-static downlink configuration.

Optionally, the determining module 801 may be specifically configured to: determining the last symbol of the PDSCH transmission in the PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration as the end position of the PDSCH repeated transmission; and determining the transmission time slot of the HARQ feedback information of the PDSCH according to the end position of the PDSCH repeated transmission and the feedback timing relation between the PDSCH and the corresponding HARQ-ACK.

Optionally, the determining module 801 may be specifically configured to: mapping HARQ-ACK feedback information corresponding to the PDSCH repeated transmission in a HARQ feedback codebook of the PDSCH at a bit position corresponding to the last PDSCH transmission time slot which does not conflict with semi-static uplink and downlink configuration; wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the terminal combines the received HARQ-ACK feedback information repeatedly transmitted by the PDSCH for many times to obtain the feedback information.

Optionally, in the HARQ feedback codebook, corresponding information is mapped to NACK at a corresponding bit position of the PDSCH retransmission timeslot other than the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration.

Based on the same technical concept, the embodiment of the present application further provides a base station, where the base station may implement the HARQ feedback process of the PDSCH repeated transmission implemented on the base station side described in the foregoing embodiment.

Referring to fig. 9, a structure of a base station provided in the embodiment of the present application is shown. The base station may include: a transmission module 901 and a reception module 902.

The transmission module 901 is configured to schedule PDSCH repeated transmission; the receiving module 902 is configured to receive a HARQ feedback codebook of a PDSCH sent by a terminal, where the HARQ feedback codebook and the feedback position of the PDSCH are determined by the terminal according to a last PDSCH transmission timeslot that does not conflict with a semi-static uplink and downlink configuration in the PDSCH retransmission.

Optionally, the last PDSCH transmission timeslot that does not collide with the semi-static uplink and downlink configuration is determined according to the following method: determining the last symbol of the PDSCH transmission in the PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration as the end position of the PDSCH repeated transmission; and determining the transmission time slot of the HARQ feedback information of the PDSCH according to the end position of the PDSCH repeated transmission and the feedback timing relation between the PDSCH and the corresponding HARQ-ACK.

Optionally, in the HARQ feedback codebook of the PDSCH, HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is mapped to a bit position corresponding to the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration; wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the feedback information is obtained after the HARQ-ACK feedback information which is repeatedly transmitted by the PDSCH and received by the terminal is combined.

Based on the same technical concept, the embodiment of the present application further provides a communication apparatus, which may be a terminal, and is capable of implementing the HARQ feedback process of PDSCH repeated transmission implemented on the terminal side described in the foregoing embodiment.

Referring to fig. 10, a schematic structural diagram of a communication device according to an embodiment of the present application is provided. As shown, the communication device may include: a processor 1001, a memory 1002, a transceiver 1003, and a bus interface 1004.

The processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 may store data used by the processor 1001 in performing operations. The transceiver 1003 is used for receiving and transmitting data under the control of the processor 1001.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 1001, and various circuits, represented by the memory 1002, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface 1004 provides an interface. The processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 may store data used by the processor 1001 in performing operations.

The process disclosed in the embodiment of the present invention may be applied to the processor 1001, or implemented by the processor 1001. In implementation, the steps of the process flow may be performed by instructions in the form of hardware, integrated logic circuits, or software in the processor 1001. The processor 1001 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1002, and the processor 1001 reads the information in the memory 1002 and completes the steps of the signal processing flow in combination with the hardware thereof.

Specifically, the processor 1001 is configured to read a program in the memory 1002 and execute the HARQ feedback procedure of the PDSCH repeated transmission implemented on the terminal side.

Based on the same technical concept, the embodiment of the present application further provides a communication apparatus, which may be a base station, and is capable of implementing the HARQ feedback procedure of PDSCH repeated transmission implemented on the base station side described in the foregoing embodiment.

Referring to fig. 11, a schematic structural diagram of a communication device according to an embodiment of the present application is provided. As shown, the communication device may include: a processor 1101, a memory 1102, a transceiver 1103, and a bus interface 1104.

The processor 1101 is responsible for managing the bus architecture and general processing, and the memory 1102 may store data used by the processor 1101 in performing operations. The transceiver 1103 is used for receiving and transmitting data under the control of the processor 1101.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1101, and various circuits of memory, represented by memory 1102, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. Bus interface 1104 provides an interface. The processor 1101 is responsible for managing the bus architecture and general processing, and the memory 1102 may store data used by the processor 1101 in performing operations.

The process disclosed by the embodiment of the invention can be applied to the processor 1101, or can be implemented by the processor 1101. In implementation, the steps of the process flow may be performed by instructions in the form of hardware, integrated logic circuits, or software in the processor 1101. The processor 1101 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1102, and the processor 1101 reads the information in the memory 1102 and completes the steps of the signal processing flow in conjunction with the hardware thereof.

Specifically, the processor 1101 is configured to read the program in the memory 1102 and execute the HARQ feedback procedure of the PDSCH repeated transmission implemented by the base station side.

Based on the same technical concept, the embodiment of the application also provides a computer readable storage medium. The computer-readable storage medium stores computer-executable instructions for causing the computer to execute the processes performed at the terminal side in the foregoing embodiments.

Based on the same technical concept, the embodiment of the application also provides a computer readable storage medium. The computer-readable storage medium stores computer-executable instructions for causing the computer to execute the processes performed by the base station side in the foregoing embodiments.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A HARQ feedback method for PDSCH repeated transmission is characterized by comprising the following steps:

the terminal determines the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the repeated transmission of the PDSCH of the physical downlink shared channel;

and the terminal determines the hybrid automatic repeat request HARQ feedback position and the feedback codebook of the PDSCH according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration.

2. The method of claim 1, wherein symbols allocated to PDSCH transmission in the last PDSCH transmission time slot not conflicting with semi-static downlink configuration correspond to semi-static downlink transmission symbols or flexible transmission symbols of the downlink configuration.

3. The method of claim 1, wherein the terminal determines the HARQ feedback position of the PDSCH according to the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration, comprising:

the terminal determines the last symbol of the PDSCH transmission in the PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration as the end position of the PDSCH repeated transmission;

and the terminal determines the transmission time slot of the HARQ feedback information of the PDSCH according to the end position of the PDSCH repeated transmission and the feedback timing relation between the PDSCH and the corresponding HARQ-ACK.

4. The method of claim 1, wherein the terminal determines the HARQ feedback codebook of the PDSCH according to the last PDSCH transmission timeslot that does not conflict with the semi-static uplink and downlink configuration, comprising:

the terminal maps HARQ-ACK feedback information corresponding to the PDSCH repeated transmission in an HARQ feedback codebook of the PDSCH and at a bit position corresponding to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration;

wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the terminal combines the received HARQ-ACK feedback information repeatedly transmitted by the PDSCH for many times to obtain the feedback information.

5. The method of claim 4, wherein corresponding information is mapped as NACK in the HARQ feedback codebook at corresponding bit positions of PDSCH retransmission slots other than the last PDSCH transmission slot that does not collide with semi-static uplink and downlink configuration.

6. A HARQ feedback method for PDSCH repeated transmission is characterized by comprising the following steps:

a base station schedules the repeated transmission of a Physical Downlink Shared Channel (PDSCH);

and the base station receives a hybrid automatic repeat request (HARQ) feedback codebook of the PDSCH sent by the terminal, wherein the HARQ feedback codebook and the feedback position of the PDSCH are determined by the terminal according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission.

7. The method of claim 6, wherein symbols allocated to PDSCH transmission in the last PDSCH transmission time slot not conflicting with semi-static downlink configuration correspond to semi-static downlink transmission symbols or flexible transmission symbols of the downlink configuration.

8. The method of claim 6, wherein the last PDSCH transmission slot that does not collide with a semi-static uplink and downlink configuration is determined according to:

determining the last symbol of the PDSCH transmission in the PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration as the end position of the PDSCH repeated transmission;

and determining the transmission time slot of the HARQ feedback information of the PDSCH according to the end position of the PDSCH repeated transmission and the feedback timing relation between the PDSCH and the corresponding HARQ-ACK.

9. The method of claim 6, wherein HARQ feedback information corresponding to the PDSCH repeated transmission is mapped in a HARQ feedback codebook for the PDSCH at a bit position corresponding to the last PDSCH transmission slot that does not collide with a semi-static uplink and downlink configuration;

wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the feedback information is obtained after the HARQ-ACK feedback information which is repeatedly transmitted by the PDSCH and received by the terminal is combined.

10. The method of claim 9, wherein corresponding information is mapped as a NACK in the HARQ feedback codebook at a corresponding bit position of the PDSCH retransmission time slot other than the last PDSCH transmission time slot that does not collide with semi-static uplink and downlink configuration.

11. A terminal, comprising:

the determining module is used for determining the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the repeated transmission of the PDSCH of the physical downlink shared channel;

and the feedback module is used for determining a hybrid automatic repeat request (HARQ) feedback position and a feedback codebook of the PDSCH according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration.

12. The terminal of claim 11, wherein symbols allocated to PDSCH transmission in the last PDSCH transmission time slot that do not conflict with semi-static downlink configuration correspond to semi-static downlink transmission symbols or flexible transmission symbols of the downlink configuration.

13. A base station, comprising:

the transmission module is used for scheduling the repeated transmission of the Physical Downlink Shared Channel (PDSCH);

and the receiving module is used for receiving a hybrid automatic repeat request (HARQ) feedback codebook of the PDSCH sent by the terminal, wherein the HARQ feedback codebook and the feedback position of the PDSCH are determined by the terminal according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission.

14. The base station of claim 13, wherein symbols allocated to PDSCH transmission in the last PDSCH transmission time slot that do not collide with semi-static downlink configuration correspond to semi-static downlink transmission symbols or flexible transmission symbols of the downlink configuration.

15. A communications apparatus, comprising: a processor, a memory, and a transceiver; the transceiver is used for transceiving data according to the instruction of the processor, and the processor is used for reading the program in the memory and executing:

determining the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the repeated transmission of the PDSCH of the physical downlink shared channel;

and determining a hybrid automatic repeat request (HARQ) feedback position and a feedback codebook of the PDSCH according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration.

16. The apparatus of claim 15, wherein symbols allocated for PDSCH transmission in the last PDSCH transmission time slot that do not collide with semi-static downlink configuration correspond to semi-static downlink transmission symbols or flexible transmission symbols of the downlink configuration.

17. The apparatus as recited in claim 15, wherein said processor is specifically configured to:

18. The apparatus as recited in claim 15, wherein said processor is specifically configured to:

mapping HARQ-ACK feedback information corresponding to the PDSCH repeated transmission in a HARQ feedback codebook of the PDSCH at a bit position corresponding to the last PDSCH transmission time slot which does not conflict with semi-static uplink and downlink configuration;

19. The apparatus of claim 18, wherein the corresponding information is mapped as a NACK at a corresponding bit position of the PDSCH retransmission time slot in the HARQ feedback codebook except for the last PDSCH transmission time slot that does not collide with semi-static uplink and downlink configuration.

20. A communications apparatus, comprising: a processor, a memory, and a transceiver; the transceiver is used for transceiving data according to the instruction of the processor, and the processor is used for reading the program in the memory and executing:

scheduling, by the transceiver, a Physical Downlink Shared Channel (PDSCH) for repeated transmission;

and receiving a hybrid automatic repeat request (HARQ) feedback codebook of the PDSCH sent by the terminal through the transceiver, wherein the HARQ feedback codebook and the feedback position of the PDSCH are determined by the terminal according to the last PDSCH transmission time slot which does not conflict with the semi-static uplink and downlink configuration in the PDSCH repeated transmission.

21. The apparatus of claim 20, wherein symbols allocated for PDSCH transmission in the last PDSCH transmission time slot that do not collide with semi-static downlink configuration each correspond to either semi-static downlink configured downlink transmission symbols or flexible transmission symbols.

22. The apparatus of claim 21, wherein the last PDSCH transmission time slot not colliding with a semi-static uplink and downlink configuration is determined according to:

23. The apparatus of claim 21, wherein HARQ feedback codebook for the PDSCH, HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is mapped in bit positions corresponding to the last PDSCH transmission slot that does not collide with a semi-static uplink or downlink configuration; wherein, the HARQ-ACK feedback information corresponding to the PDSCH repeated transmission is: and the feedback information is obtained after the HARQ-ACK feedback information which is repeatedly transmitted by the PDSCH and received by the terminal is combined.

24. The apparatus of claim 23, wherein corresponding information is mapped as a NACK in the HARQ feedback codebook at corresponding bit positions of the PDSCH retransmission time slot other than the last PDSCH transmission time slot that does not collide with semi-static uplink and downlink configuration.

25. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 1 to 5.

26. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 6 to 10.