CN112242883B

CN112242883B - Method and equipment for sending hybrid automatic repeat request (HARQ) at multiple points

Info

Publication number: CN112242883B
Application number: CN201910656807.3A
Authority: CN
Inventors: 焦慧颖
Original assignee: China Academy of Information and Communications Technology CAICT
Current assignee: China Academy of Information and Communications Technology CAICT
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2022-04-22
Anticipated expiration: 2039-07-19
Also published as: CN112242883A; WO2021012662A1

Abstract

The application discloses a method for sending a hybrid automatic repeat request by multiple points, wherein a downlink control signaling comprises first indication information, second indication information and a DAI value; the first indication information is used for indicating whether the signaling is used for multi-TRP scheduling; the second indication information is used for indicating the identification of TRP; the DAI value comprises a DAI count value and a DAI total value and is used for determining the HARQ-ACK information sequence, the DAI count value in the downlink control signaling sent by the multi-TRP downlink data is increased according to the number of the scheduled TRPs, and the DAI total value is the total number of the scheduled PDSCHs till the current downlink control signaling detection opportunity. The application also provides the terminal equipment, the network equipment and the mobile communication system applying the method. The application solves the problem of how to perform hybrid automatic repeat request (HARQ) when multiple TRPs are available.

Description

Method and equipment for sending hybrid automatic repeat request (HARQ) at multiple points

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a method, a device, and a system for sending an uplink feedback hybrid automatic repeat request under a multi-point sending condition.

Background

During multipoint transmission, if ideal postback transmission exists among a plurality of sending points, a downlink control channel from one sending point (TRP) schedules downlink data transmission of the plurality of sending points (TRPs), only uplink control information corresponding to the plurality of TRPs needs to be reported to the one TRP, and how to design a combined HARQ codebook of the plurality of TRPs needs to be considered.

The dynamic codebook mechanism in NR is similar to that in LTE, and is generated based on the DAI value in DCI. The dynamic codebook refers to a codebook generation mode in which the size of the HARQ-ACK codebook is dynamically changed according to the actual data scheduling situation. When a single PDCCH schedules multi-TRP downlink data transmission, how to calculate DAIs of the multi-TRP and further how to determine a dynamic HARQ-ACK codebook does not have the prior art.

Disclosure of Invention

The invention provides a method and equipment for sending hybrid automatic repeat request (HARQ) at multiple points, which solve the problem of how to carry out HARQ when multiple TRPs exist.

In a first aspect, an embodiment of the present application provides a method for sending a hybrid automatic repeat request at multiple points, where a Downlink control signaling includes first indication information, second indication information, and a DAI (Downlink Assignment Index) value; the first indication information is used for indicating whether the signaling is used for multi-TRP scheduling; the second indication information is used for indicating the identification of TRP; and determining the HARQ-ACK codebook sequence by using the DAI value, the first indication information and the second indication information in at least one downlink control signaling.

The DAI value comprises a DAI count value and a DAI total value and is used for determining the HARQ-ACK information sequence; in the downlink control signaling sent by the multi-TRP downlink data, the DAI count value is increased according to the scheduled TRP number, and the DAI total value is the total number of the scheduled PDSCH until the current downlink control signaling detection time.

Preferably, the downlink control signaling comprises a type III downlink control signaling and/or a type IV downlink control signaling; the DAI value corresponding to the type III downlink control signaling and the DAI value corresponding to the type IV downlink control signaling are indicated independently; the type III downlink control signaling is a downlink control signaling in a carrier wave in which a CBG (code block group) is opened, and the type IV downlink control signaling is a downlink control signaling in a carrier wave in which a CBG is not opened; or, the type III downlink control signaling is a downlink control signaling in a carrier not starting a CBG, and the type IV downlink control signaling is a downlink control signaling in a carrier starting a CBG.

Preferably, the downlink control signaling comprises a type I downlink control signaling and/or a type II downlink control signaling; the DAI value corresponding to the type I downlink control signaling and the DAI value corresponding to the type II downlink control signaling are indicated independently; the first indication information in the class I downlink control signaling indicates single TRP scheduling, and the first indication information in the class II downlink control signaling indicates a plurality of TRP scheduling; or, the first indication information in the class I downlink control signaling indicates multiple TRP scheduling, and the first indication information in the class II downlink control signaling indicates single TRP scheduling.

As the further optimized embodiment of the method, the HARQ-ACK codebook comprises the following steps in the following sequence: a class III codebook containing HARQ-ACK information corresponding to class III downlink control signaling, e.g., carriers for non-activated (or activated) CBGs containing HARQ-ACK information corresponding to downlink control signaling; the type IV codebook contains HARQ-ACK information corresponding to type IV downlink control signaling, e.g., carriers used for open (or not open) CBG, containing HARQ-ACK information corresponding to downlink control signaling.

Further preferably, the HARQ-ACK codebook comprises, in the following order: the class III codebook comprises HARQ-ACK information corresponding to the class III control signaling, wherein the type III codebook further comprises HARQ-ACK information of the class I downlink control signaling and/or the class II downlink control signaling; and the IV-type codebook comprises HARQ-ACK information corresponding to the IV-type control signaling, and further comprises HARQ-ACK information of the I-type downlink control signaling and/or the II-type downlink control signaling.

As a further optimized embodiment of the method of the present invention, the HARQ-ACK codebook comprises the following sequences: a class I codebook including HARQ-ACK information corresponding to a class I downlink control signaling; and the II type codebook comprises HARQ-ACK information corresponding to the II type downlink control signaling.

Further preferably, the HARQ-ACK codebook further includes, in order corresponding to carriers for which CBG is not turned on: a class I codebook including HARQ-ACK information corresponding to a class I downlink control signaling; and the II type codebook comprises HARQ-ACK information corresponding to the II type downlink control signaling.

Further preferably, the HARQ-ACK codebook further includes, in order corresponding to the carrier for which CBG is turned on: a class I codebook including HARQ-ACK information corresponding to a class I downlink control signaling; and the II type codebook comprises HARQ-ACK information corresponding to the II type downlink control signaling.

In any of the method embodiments of the present invention, further, the first indication information is 0, and is used to indicate a single TRP.

In any of the method embodiments of the present invention, further, the first indication information is 1, and is used for representing a plurality of TRPs.

In any embodiment of the method of the present invention, further, the second indication information is N bits for indicating identities of N TRPs, where N is an integer value having an upper limit.

In a second aspect, an embodiment of the present application provides a terminal device, which is used in any method embodiment of the present application, where the terminal device includes a downlink receiving module, a determining module, and an uplink sending module.

And the downlink receiving module is used for receiving the downlink control signaling and identifying the first indication information and the second indication information.

And the determining module is used for determining the sequence of the HARQ-ACK information in the HARQ-ACK codebook according to the first indication information, the second indication information and the DAI value.

And the uplink sending module is used for sending the HARQ-ACK codebook.

In a third aspect, an embodiment of the present application provides a network device, which is used in any method embodiment of the present application, where the network device includes a downlink sending module and an uplink receiving module.

And the downlink sending module is configured to send the downlink control signaling, and includes the first indication information and the second indication information.

And the uplink receiving module is used for receiving the HARQ-ACK codebook.

In a fourth aspect, the present application further proposes a mobile communication system, which includes at least 1 terminal device according to the third aspect of the present application and at least 1 network device according to the fourth aspect of the present application.

The scheme comprises a downlink control signaling design and a codebook design of HARQ-ACK feedback under the condition that a single downlink control channel controls the transmission of multiple TRPs when the downlink data is transmitted by multiple TRPs, and at least one technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:

and the downlink control signaling adds indication information to indicate whether the carrier scheduling is multi-TRP scheduling. When the TRPIF indicates multi-TRP scheduling, the specific TRP identification of scheduling is indicated by increasing N bits, and the total number of the multi-TRP scheduling has an upper limit value at the same time. The method realizes the integrity of the multi-TRP scheduling flow.

The HARQ-ACK code words are arranged according to the sequence of a carrier domain first and a time domain second, and when a downlink control channel schedules a plurality of TRPs, the TRPs are arranged according to the sequence of TRP identifiers. The unification of the base station and the terminal is ensured when the HARQ-ACK code words of multiple TRPs are fed back. The sequence of the carrier domain first and the time domain second refers to that the carrier domain is sequenced according to the carrier domain on the premise of fixing a time point, then the sequence is gradually increased along with the time point, and the carrier domain sequencing is performed at the next time point.

For example, when the CBG is not turned on, the HARQ-ACK fed back by the downlink data sent by a single TRP forms a first codebook, the HARQ-ACK fed back by the downlink data sent by multiple TRPs forms a second codebook, and the second codebook is placed in the first codebook to form a final dynamic codebook, thereby reducing the overhead amount of the codebooks.

For another example, when the CBG is turned on, HARQ-ACK information fed back by downlink data sent by a single TRP not turning on the CBG, HARQ-ACK information fed back by downlink data sent by multiple TRPs not turning on the CBG, HARQ-ACK information fed back by downlink data sent by a single TRP turning on the CBG, HARQ-ACK information fed back by downlink data sent by multiple TRPs turning on the CBG are arranged in sequence to form a final dynamic codebook, and the overhead amount of the feedback codebook is reduced in combination with the problem that the overhead of CBG feedback and the overhead of feedback sent by multiple TRPs are large.

The DAI counting method in the downlink control signaling sent by the multiple TRP downlink data is added by the scheduled TRP data, so that the missed detection of the multiple TRP downlink data during the scheduling of a single downlink control signaling can be better identified, and the probability of the missed detection of the multiple TRP data during the scheduling of the multiple TRP by the single downlink control signaling is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a diagram of a HARQ-ACK codebook including a class I codebook and a class II codebook;

FIG. 2 is a diagram of a HARQ-ACK codebook including a class III codebook and a class IV codebook;

FIG. 3 is a flowchart of an embodiment of the method of the present invention applied to a terminal device;

FIG. 4 is a flow chart of an embodiment of the method of the present invention for a network device;

FIG. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a network device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a mobile communication system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

The embodiment of the application provides a method for sending hybrid automatic repeat request (HARQ) at multiple points, wherein a downlink control signaling comprises first indication information (TRP IF), second indication information (TRP ID) and a DAI value.

The first indication information is used for indicating whether the signaling is used for multi-TRP scheduling; the second indication information is used to indicate the identity of the TRP. For example, the first indication information is 0 for representing a single TRP. For another example, the first indication information is 1, which is used to indicate a plurality of TRPs.

Further, the second indication information is N bits for indicating identities of N TRPs, where N is an integer value having an upper limit.

And when one or more downlink control signaling exists, determining the HARQ-ACK codebook sequence by using the DAI value, the first indication information and the second indication information in the one or more downlink control signaling.

The DAI value comprises a DAI count value and a DAI total value and is used for determining the HARQ-ACK information sequencing. For example, DCI format 1_0 and DCI format 1_1 include DAI count value (counter DAI) information indicating the cumulative number of PDSCHs scheduled by DCI format 1_0 and DCI format 1_1 until the current serving cell and the current PDCCH detection timing, or the cumulative number of SPS releases indicated by DCI format 1_ 0. The counting sequence is as follows: according to PDCCH detection opportunity index ascending order; and at the same PDCCH detection opportunity, ascending according to the index of the serving cell. That is, the DCI format 1_1 includes total DAI (total DAI) information, and the value thereof represents the total number of PDSCHs scheduled by DCI format 1_0 and DCI format 1_1 or SPS releases indicated by DCI format 1_0 until the current PDCCH detection opportunity.

In the invention, for the dynamic HARQ-ACK code word fed back by the uplink control information, the counter DAI and the total DAI are adopted for determining the HARQ-ACK load and the HARQ-ACK bit sequence. How to calculate the DAI of multiple TRPs in the multi-TRP downlink data transmission scheduled by a single PDCCH, the patent proposes that the DAI of a dynamic HARQ-ACK code word is calculated by adopting a multipoint joint mode.

FIG. 1 is a diagram of a HARQ-ACK codebook including a class I codebook and a class II codebook.

In the present application, the downlink control signaling includes a type I downlink control signaling and/or a type II downlink control signaling; the DAI value corresponding to the type I downlink control signaling and the DAI value corresponding to the type II downlink control signaling are indicated independently; in the embodiment shown in fig. 1, in the class I downlink control signaling, the first indication information indicates that the class I downlink control signaling is used for single TRP scheduling; in the type II downlink control signaling, the first indication information indicates that the type II downlink control signaling is used for scheduling a plurality of TRPs.

As a further optimized embodiment of the method of the present invention, the HARQ-ACK codebook comprises the following sequences: a class I codebook further comprising HARQ-ACK information corresponding to a class I downlink control signaling; the type II codebook further comprises HARQ-ACK information corresponding to the type II downlink control signaling.

For example, when CBG transmission is not started, the terminal schedules data on multiple TRPs of multiple carriers, first determines that the data is transmitted as a single TRP according to the TRPIF indication information of the downlink control signaling, and determines a class I codebook, and a DAI count value and a DAI total value of the class I codebook are counted independently. And judging whether the data is transmitted by multiple TRPs according to the TRIF indication information of the downlink control signaling, and determining a II-type codebook. The DAI count value and the total DAI value of the class II codebook are counted independently, the DAI count value is increased according to the number of the scheduled TRPs and is a number larger than 1, specifically, in the downlink control signaling transmitted by the multi-TRP downlink data, the DAI count value is increased according to the detection time of the previous multi-TRP downlink control signaling and the number of the TRPs scheduled by the previous multi-TRP serving cell (carrier). And the DAI total value is defined as the total number of scheduled PDSCHs until the current PDCCH detection occasion. And placing the II type code book in the I type code book, and generating a final dynamic code book.

As shown in fig. 1, PDSCH3, PDSCH4, PDSCH5, PDSCH6, PDSCH9, PDSCH10, PDSCH11, and PDSCH12 are downlink data transmitted by a single TRP, HARQ-ACK codeword sorting is performed in a carrier domain first and then in a time domain to generate a 1 st codebook (which is the above-mentioned class I codebook), and the DAI count value and the DAI total value of this codebook are independently counted, as shown in a signal body indicated by a gray box in fig. 1, wherein bold fonts (1,1) to (6,6) indicate DAI values corresponding to the above-mentioned PDSCHs, and the format is (DAI count value, DAI total value). The number of bits of the 1 st codebook is 1 bit. The sequence of the carrier domain first and the time domain second refers to that the frequency domain sequencing is performed according to the frequency domain on the premise of fixing a time point, and then the frequency domain sequencing is performed at the next time point along with the increasing of the time point.

PDSCH1 and PDSCH2 are downlink data transmitted by a plurality of TRPs (TRP1 and TRP2) of one carrier (CC #0), PDSCH7 and PDSCH8 are downlink data transmitted by a plurality of TRPs (TRP3 and TRP4) of one carrier (CC #1), PDSCH13 and PDSCH14 are downlink data transmitted by a plurality of TRPs (TRP1 and TRP2) of one carrier (CC #0), PDSCH15 and PDSCH16 are downlink data transmitted by a plurality of TRPs (TRP3 and TRP4) of one carrier (CC #1), HARQ-ACK codeword sorting is performed according to the carrier domain first and time domain second, and codewords of the plurality of TRPs at the same PDCCH transmission time are sorted according to the identification (TRP ID) order of the TRPs, for example, sorted from small to large order of TRP IDs. And generating a 2 nd codebook (which is the II-type codebook), wherein the DAI count value and the DAI total value of the 2 nd codebook are counted independently, the DAI count value is the increase of the number of TRPs scheduled according to the scheduling time of the downlink control signaling, and the DAI total value is the total number of TRPs at the current scheduling time of the downlink control signaling. The signal body shown by the white square in fig. 1, wherein (1,2) to (7, 8) indicate DAI values corresponding to the above-mentioned PDSCHs, and the format is (DAI count value, total DAI value).

For example, CC #0TRP1 transmits DCI including DAI ═ 1,2 for scheduling PDSCH1 transmitted by TRP1 and PDSCH2 transmitted by TRP 2. The total number of scheduled PDSCHs until the current PDCCH detection occasion is 2, so the total DAI value at PDSCH1 is 2. Since the cumulative number of PDSCHs scheduled until the current serving cell (CC #0) and the current PDCCH detection timing at PDSCH1 is 1, the DAI count value is 1.

It should be noted that DCI transmitted at TRP1 or TRP2 of CC #0 is equivalent. If the base station decides to transmit DCI at TRP2(PDSCH2), the DCI of TRP2 describes DAI ═ 1,2, and since 2 TRPs have already been notified by the signaling of the present invention, the terminal can know that one PDSCH1 is also transmitted at TRP 1. And sending out the DCI at which TRP, and accumulating the DAI with which TRP participates to form a DAI count value in the DCI at the current moment.

At another PDSCH detection occasion, CC #1TRP3 issues DCI containing DAI ═ 3,4 for scheduling PDSCH7 for TRP3 transmissions and PDSCH8 for TRP4 transmissions. The total number of scheduled PDSCHs until the current PDCCH detection occasion is 4, so the total DAI value at PDSCH1 is 4. The DAI count value is increased according to the number of scheduled TRPs, specifically, the DAI count value is increased according to the number of TRPs scheduled by the previous multi-TRP downlink control signaling detection timing (PDSCH1/PDSCH2) and the previous multi-TRP serving cell (CC #0), that is, the increase value is 2, the cumulative number of PDSCHs scheduled at PDSCH7 until the current serving cell (CC #1) and the current PDCCH detection timing is 3, and thus the DAI count value is 3.

The number of bits in the 2 nd codebook is P bits, where P is 2 in the example of fig. 1, are generated according to the number of scheduled TRPs.

And placing the 2 nd codebook behind the 1 st codebook to generate a final dynamic codebook.

It should be further noted that, in this embodiment, the first indication information in the class I downlink control signaling indicates a single TRP scheduling, and the first indication information in the class II downlink control signaling indicates multiple TRP scheduling, so that a single TRP situation precedes a multiple TRP situation in the HARQ-ACK codebook. In another possible embodiment, the first indication information in the class I downlink control signaling indicates multiple TRP scheduling, and the first indication information in the class II downlink control signaling indicates single TRP scheduling, so that multiple TRP situations in the HARQ-ACK codebook precede single TRP situations.

FIG. 2 is a diagram of a HARQ-ACK codebook including a type III codebook and a type IV codebook.

In the present application, the downlink control signaling includes a type III downlink control signaling and/or a type IV downlink control signaling; the DAI value corresponding to the type III downlink control signaling and the DAI value corresponding to the type IV downlink control signaling are indicated independently; preferably, in the embodiment shown in fig. 2, the type III downlink control signaling is a downlink control signaling in a carrier that starts a CBG; and the type IV downlink control signaling is downlink control signaling in a carrier wave without starting the CBG.

As the further optimized embodiment of the method, the HARQ-ACK codebook comprises the following steps in the following sequence: the type III codebook is used for carriers without starting CBG and comprises HARQ-ACK information corresponding to downlink control signaling; and the IV type codebook is used for starting the carrier wave of the CBG and comprises HARQ-ACK information corresponding to the downlink control signaling.

For example, the HARQ-ACK codebook includes, in the following order: the type III codebook corresponds to a carrier wave which does not start the CBG, and further comprises HARQ-ACK information of a type I downlink control signaling or a type II downlink control signaling; and the IV type codebook corresponds to a carrier for starting the CBG, and further comprises HARQ-ACK information of the I type downlink control signaling and/or the II type downlink control signaling.

For another example, the HARQ-ACK codebook further includes, for a carrier for which CBG is not turned on, in the following order: a class I codebook including HARQ-ACK information corresponding to a class I downlink control signaling; and the II type codebook comprises HARQ-ACK information corresponding to the II type downlink control signaling. That is, for the type I downlink control signaling and the type II downlink control signaling in the carrier not having CBG turned on, the type I codebook and the type II codebook are correspondingly generated and sequentially connected.

For another example, the HARQ-ACK codebook further includes, for a carrier for which CBG is turned on, in the following order: a class I codebook including HARQ-ACK information corresponding to a class I downlink control signaling; and the II type codebook comprises HARQ-ACK information corresponding to the II type downlink control signaling. That is, for the type I downlink control signaling and the type II downlink control signaling in the carrier that starts the CBG, the type I codebook and the type II codebook are generated correspondingly and connected sequentially.

The terminal aims at four conditions of single TRP transmission of an N1 cell without opening the CBG, multi-TRP transmission of an N1 cell without opening the CBG, single TRP transmission of an N2 cell with opening the CBG and multi-TRP transmission of an N2 cell with opening the CBG, DAI values of the four conditions are indicated independently, namely, DAI counting values and DAI total values of the four conditions are counted respectively.

The DAI count value increment of the multi-TRP transmission is a number greater than 1 as the number of scheduled TRPs increases. And the DAI total value is defined as the total number of PDSCHs up to the moment of currently monitoring the PDCCH.

For example, a single TRP transmission of N1 cells in which the terminal did not turn CBG on determines HARQ-ACK 1 st codebook (both class I and class III codebooks). The 1 st codebook is arranged in the order of the carrier domain first and the time domain second according to each downlink control channel transmission time.

For another example, the terminal determines the HARQ-ACK 2 nd codebook (both type II and type III codebooks) for the multi-TRP transmission of the N1 cells not having CBG turned on. The 2 nd codebook is arranged according to the transmission time of each downlink control channel according to the sequence of the carrier domain first and the time domain second, and a plurality of TRPs at each transmission time of the downlink control channel are arranged according to the sequence of TRP IDs (for example, the numerical values are from small to large).

For another example, the terminal turns on a single TRP transmission of N2 cells of the CBG to determine the HARQ-ACK 3 rd codebook (both class I and class IV codebooks). The 3 rd codebook is arranged according to the order of the carrier domain first and the time domain second according to each downlink control channel transmission time.

For another example, the terminal turns on the multiple TRP transmission of the N2 cells of the CBG to determine the HARQ-ACK 4 th codebook (both class II and class IV codebooks). The 4 th codebook is arranged according to the sequence of a carrier domain first and a time domain second according to each downlink control channel transmission time, and a plurality of TRPs at each downlink control channel transmission time are arranged according to the sequence of TRP IDs.

Preferably, the type III codebook precedes the type IV codebook; in the III-type codebook, the I-type codebook is preceded and the II-type codebook is followed; in the IV-type codebook, the I-type codebook is preceded and the II-type codebook is followed. Therefore, the terminal obtains the final dynamic codebook by placing the 2 nd codebook after the 1 st codebook, the 3 rd codebook after the 2 nd codebook, and the 4 th codebook after the 3 rd codebook.

As shown in fig. 3, PDSCH3, PDSCH5, PDSCH10 and PDSCH12 are downlink data transmitted by a single TRP without CBG carrier (CC #1) turned on, and HARQ-ACK codeword sorting is performed in the carrier domain first and then in the time domain to generate the 1 st codebook, and the DAI count value and the total DAI value of this codebook are counted independently as (1,1), (2, 2), (3, 3) and (4, 4), respectively. The number of bits of the 1 st codebook is 1 bit, and 1 bit HARQ-ACK information is fed back for one TB transmitted by a single TRP.

And PDSCH7 and PDSCH8 are downlink data transmitted by a plurality of TRPs (TRP1 and TRP2) of one carrier (CC #1) without CBG (channel control information), PDSCH15 and PDSCH16 are downlink data transmitted by a plurality of TRPs (TRP1 and TRP2) of one carrier (CC #1) without CBG (channel control information), HARQ-ACK code word sorting is carried out according to a carrier domain first and a time domain second, and code words of a plurality of TRPs at the same PDCCH transmission time are sorted according to a TRP ID sequence. A2 nd codebook is generated, and the DAI count value and the DAI total value of the codeword are independently counted, namely (1,2) and (3, 4). And the DAI total value is the increase of the number of TRPs scheduled according to the scheduling time of the current downlink control signaling, and the DAI total value is the TRP total value of the scheduling time of the current downlink control signaling. And generating P bits according to the number of the scheduled TRPs by the number of bits of each code word of the 2 nd codebook, and feeding back P bit HARQ-ACK information for P TBs (one TB for each TRP) sent by the P TRPs. Note also that the embodiment of fig. 2 differs from the embodiment of fig. 1 in the way TRP is identified: in the embodiment of fig. 1, the plurality of TRPs in CC #0 and the plurality of TRPs in CC #1 are numbered uniformly, and in the embodiment of fig. 2, the plurality of TRPs in CC #0 and the plurality of TRPs in CC #1 are numbered independently. The present application does not limit the way of TRP identity, that is, the plurality of TRP identities carried in the second information may be used in combination with (or without) carrier information for determining and distinguishing the plurality of TRPs.

PDSCH4, PDSCH6, PDSCH9, and PDSCH11 are downlink data transmitted by a single TRP with CBG carrier (CC #0) turned on, HARQ-ACK codeword sorting is performed according to the carrier domain first and then the time domain to generate the 3 rd codebook, and the DAI count value and the total DAI value of this codeword are counted independently as (1,1), (2, 2), (3, 3), and (4, 4), respectively. The bit number of each code word of the 3 rd codebook is L bits, and L bits HARQ-ACK information can be fed back for L CBGs sent by a single TRP.

And PDSCH1 and PDSCH2 are downlink data transmitted by a plurality of TRPs (TRP1 and TRP2) of one carrier (CC #0) for CBG activation, PDSCH13 and PDSCH14 are downlink data transmitted by a plurality of TRPs of one carrier for CBG activation, HARQ-ACK codeword sorting is performed according to the carrier domain first and then the time domain, and codewords of a plurality of TRPs at the same PDCCH transmission time are sorted according to the TRP ID order. A4 th codebook is generated, and the DAI count value and the DAI total value of the codebook are counted independently and are (1,2) and (3,4) respectively. And the DAI count value is the increase of the number of TRPs scheduled according to the scheduling time of the current downlink control signaling, and the DAI total value is the total number of TRPs at the scheduling time of the current downlink control signaling. The bit number of the 4 th codebook is multiplied by the feedback bit number L of the CBG according to the number P of the scheduling TRP to generate L bit, and the HARQ-ACK information of the P bit HARQ-ACK information is fed back for the P bit L CBGs (each TRP CBG L) sent by the P TRP.

It should be noted that, in this embodiment, the type III downlink control signaling is a downlink control signaling in a carrier where CBG is turned on, and the type IV downlink control signaling is a downlink control signaling in a carrier where CBG is not turned on, so that a case where CBG is turned on in an HARQ-ACK codebook may be preceded and a case where CBG is not turned on may be succeeded. In another embodiment of the present application, if the type III downlink control signaling is an in-carrier downlink control signaling that does not open CBG, and the type IV downlink control signaling is an in-carrier downlink control signaling that opens CBG, a situation that does not open CBG in an HARQ-ACK codebook may precede a situation that opens CBG.

Fig. 3 is a flowchart of an embodiment of the method of the present invention applied to a terminal device. The method of the first aspect of the present application, applied to a terminal device, includes the following steps 31 to 33.

Step 31, receiving a downlink control signaling, and identifying the first indication information, the second indication information and the DAI value;

in step 31, the downlink control signaling includes first indication information, second indication information, and a DAI value; the first indication information is used for indicating whether the signaling is used for multi-TRP scheduling; the second indication information is used for indicating the identification of TRP; the DAI value comprises a DAI count value and a DAI total value; the first indication information, the second indication information and the DAI value are used for determining the HARQ-ACK information sequencing.

In any embodiment of the present invention, further, the first indication information is 0, and is used to indicate a single TRP. In any of the method embodiments of the present invention, further, the first indication information is 1, and is used for representing a plurality of TRPs. In any method embodiment of the present invention, further, the second indication information in the downlink control signaling is N bits, and is used to indicate the identities of N TRPs.

For example, a single control signaling schedules multiple TRP transmissions, and the scheduled TRPIF information, TRP ID information is added to the downlink control signaling. And the cross-carrier scheduling indication of the downlink control signaling, which is used for indicating the number of scheduled carriers, specific carrier parameters, the number of TRPs scheduled by each carrier and specific TRP information to the terminal.

TRPIF is set to 0 when a single TRP is transmitted; when multiple TRPs are transmitted, TRPIF is set to 1. And adding N bits to indicate the identities of the N TRPs. The N bits are limited by the maximum number of multiple TRP transmission points.

The terminal counts the DAI count value and the DAI total value for single TRP transmission and multi TRP transmission, respectively. The increment of the DAI count value transmitted by multiple TRPs increases with the number of scheduled TRPs, and is greater than 1; the DAI total value is defined as the total number of PDSCHs up to the moment of currently monitoring the PDCCH.

Preferably, the downlink control signaling comprises a type III downlink control signaling and/or a type IV downlink control signaling; and the DAI value corresponding to the type III downlink control signaling and the DAI value corresponding to the type IV downlink control signaling are indicated independently. The type III downlink control signaling is a downlink control signaling in a carrier wave for starting a CBG, and the type IV downlink control signaling is a downlink control signaling in a carrier wave for not starting the CBG; or, the type III downlink control signaling is a downlink control signaling in a carrier not starting a CBG, and the type IV downlink control signaling is a downlink control signaling in a carrier starting a CBG.

For another example, when N carriers are turned on, N1 carriers are sent based on TB, N2 carriers are sent based on CBG, the terminal schedules data on multiple TRPs of multiple carriers, and the corresponding downlink control signaling design and HARQ-ACK codeword generation methods are as follows:

and scheduling a plurality of TRPs to be sent by a single control signaling, and adding the scheduled TRP IF information and TRP ID information in the downlink control signaling, together with a cross-carrier scheduling indication of the downlink control signaling, for indicating the number of scheduled carriers, specific carrier parameters, the number of TRPs scheduled by each carrier and specific TRP information to the terminal.

TRPIF is set to 0 when a single TRP is transmitted; when multiple TRPs are transmitted, TRPIF is set to 1. And adding N bits to indicate specific TRP sending information in the N TRPs. And the N bits determine an upper limit according to the maximum value of the multi-TRP sending point number.

The terminal respectively counts the DAI count value and the DAI total value aiming at four conditions of single TRP transmission of an N1 cell without starting the CBG, multi-TRP transmission of an N1 cell without starting the CBG, single TRP transmission of an N2 cell with starting the CBG and multi-TRP transmission of an N2 cell with starting the CBG. Wherein the DAI count value increment of the multi-TRP transmission is a number greater than 1 as the number of scheduled TRPs increases. And the DAI total value is defined as the total PDSCHs number up to the moment of currently monitoring the PDCCH.

Step 32, determining the sequence of HARQ-ACK information in the HARQ-ACK codebook;

in step 32, as a further optimized embodiment of the method of the present invention, the HARQ-ACK codebook includes, in the following order: a class I codebook further comprising HARQ-ACK information corresponding to a class I downlink control signaling; the type II codebook further comprises HARQ-ACK information corresponding to the type II downlink control signaling.

For example, the terminal determines the class I codebook from a single TRP transmission. The arrangement order of the class I codebook is arranged according to the transmission time of each downlink control channel according to the order of the carrier domain first and the time domain second. And the terminal determines the II-type codebook according to the multiple TRPs. The arrangement sequence of the class II codebook is arranged according to the transmission time of each downlink control channel according to the sequence of a carrier domain first and a time domain second, and a plurality of TRPs at the transmission time of each downlink control channel are arranged according to the sequence of TRP IDs. And the terminal places the II-type codebook behind the I-type codebook to obtain a final dynamic codebook.

The HARQ-ACK codebook comprises the following sequences: a class III codebook including HARQ-ACK information corresponding to a class III downlink control signaling; and the IV type codebook comprises HARQ-ACK information corresponding to the IV type downlink control signaling.

For example, the HARQ-ACK codebook includes, in the following order: the type III codebook corresponds to a carrier wave which does not start the CBG, wherein the type III codebook further comprises HARQ-ACK information of a type I downlink control signaling or a type II downlink control signaling; and the IV type codebook corresponds to a carrier for starting the CBG, wherein the IV type codebook further comprises HARQ-ACK information of the I type downlink control signaling or the II type downlink control signaling.

For another example, the terminal determines the class III codebook through single and/or multiple TRP transmission of the N1 cells not starting CBG; the terminal starts single and/or multiple TRP transmission of N2 cells of the CBG to determine a type IV codebook. And the terminal places the IV type codebook after the III type codebook to obtain a final dynamic codebook.

It should be noted that, when the class III codebook includes a class I codebook and a class II codebook, the class I codebook precedes the class II codebook in the class III codebook. It should be noted that, when the class IV codebook includes a class I codebook and a class II codebook, the class I codebook precedes the class II codebook in the class IV codebook.

And step 33, transmitting the HARQ-ACK codebook.

Fig. 4 is a flowchart of an embodiment of the method of the present invention applied to a network device. The method of the first aspect of the present application, applied to a network device, includes the following steps 41 to 43.

Step 41, sending a downlink control signaling, where the downlink control signaling includes first indication information, second indication information, and a DAI value;

in step 41, the downlink control signaling includes the first indication information, the second indication information, and the DAI value; the first indication information is used for indicating whether the signaling is used for multi-TRP scheduling; the second indication information is used for indicating the identification of TRP; the DAI value comprises a DAI count value and a DAI total value; the first indication information, the second indication information and the DAI value are used for determining the HARQ-ACK information sequencing.

In any embodiment of the present invention, further, the first indication information is 0, and is used to indicate a single TRP. In any of the method embodiments of the present invention, further, the first indication information is 1, and is used for representing a plurality of TRPs. In any embodiment of the method of the present invention, further, the second indication information is N bits, and is used to indicate identities of N TRPs.

Preferably, the downlink control signaling comprises a type III downlink control signaling and/or a type IV downlink control signaling; the DAI value corresponding to the type III downlink control signaling and the DAI value corresponding to the type IV downlink control signaling are indicated independently; the type III downlink control signaling is a downlink control signaling in a carrier wave for starting a CBG, and the type IV downlink control signaling is a downlink control signaling in a carrier wave for not starting the CBG; or, the type III downlink control signaling is a downlink control signaling in a carrier wave without starting a CBG; and the type IV downlink control signaling is a downlink control signaling in a carrier wave for starting CBG.

Step 42, determining the sequence of HARQ-ACK information in the HARQ-ACK codebook;

in step 42, as a further optimized embodiment of the method of the present invention, the HARQ-ACK codebook comprises in the following order: a class I codebook further comprising HARQ-ACK information corresponding to a class I downlink control signaling; the type II codebook further comprises HARQ-ACK information corresponding to the type II downlink control signaling.

Further, the HARQ-ACK codebook comprises, in the following order: a class III codebook including HARQ-ACK information corresponding to a class III downlink control signaling; and the IV type codebook comprises HARQ-ACK information corresponding to the IV type downlink control signaling.

And step 43, receiving the HARQ-ACK codebook.

Fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.

The embodiment of the present application provides a terminal device 10, which is used in any method embodiment of the present application, and the terminal device includes a downlink receiving module 11, a determining module 13, and an uplink sending module 12.

And the downlink receiving module is used for receiving the downlink control signaling and identifying the first indication information, the second indication information and the DAI value.

And the uplink sending module is used for sending the HARQ-ACK codebook.

How the downlink receiving module recognizes the downlink control signaling: in the downlink control signaling, the first indication information is used for indicating whether the signaling is used for multi-TRP scheduling; the second indication information is used for indicating the identification of TRP; the DAI value comprises a DAI count value and a DAI total value and is used for determining the HARQ-ACK information sequencing.

Preferably, the downlink control signaling comprises a type I downlink control signaling and/or a type II downlink control signaling; in the class I downlink control signaling, first indication information indicates that the class I downlink control signaling is used for single (or multiple) TRP scheduling; in the type II downlink control signaling, first indication information indicates that the type II downlink control signaling is used for multiple (or single) TRP scheduling; and the DAI value corresponding to the type I downlink control signaling and the DAI value corresponding to the type II downlink control signaling are indicated independently.

Preferably, the downlink control signaling comprises a type III downlink control signaling and/or a type IV downlink control signaling; the type III downlink control signaling is a downlink control signaling in a carrier wave of a CBG (CBG) which is started (or not started); the type IV downlink control signaling is a downlink control signaling in a carrier wave of which the CBG is not started (or started); and the DAI value corresponding to the type III downlink control signaling and the DAI value corresponding to the type IV downlink control signaling are indicated independently.

Further, the first indication information is 0 for representing a single TRP.

Further, the first indication information is 1, and is used for representing a plurality of TRPs.

Further, the second indication information is N bits for indicating identities of N TRPs.

Preferably, when the determining module determines the order of the HARQ-ACK codebook, the HARQ-ACK codebook includes, in accordance with the following order: a type III codebook, which is used for starting (or not starting) carriers of the CBG and comprises HARQ-ACK information corresponding to downlink control signaling; a class IV codebook for carriers with CBG not turned on (or turned on), including HARQ-ACK information corresponding to downlink control signaling.

As a further optimized embodiment of the device of the invention, the HARQ-ACK codebook comprises the following sequences: a class I codebook further comprising HARQ-ACK information corresponding to a class I downlink control signaling; the type II codebook further comprises HARQ-ACK information corresponding to the type II downlink control signaling.

For example, corresponding to carriers without CBG turned on, the HARQ-ACK codebook further includes, in the following order: a class I codebook including HARQ-ACK information corresponding to a class I downlink control signaling; and the II type codebook comprises HARQ-ACK information corresponding to the II type downlink control signaling.

For another example, the HARQ-ACK codebook further includes, for a carrier for which CBG is turned on, in the following order: a class I codebook including HARQ-ACK information corresponding to a class I downlink control signaling; and the II type codebook comprises HARQ-ACK information corresponding to the II type downlink control signaling.

Fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present invention.

In a third aspect, an embodiment of the present application provides a network device 20, which is used in any method embodiment of the present application, and the network device includes a downlink sending module 21 and an uplink receiving module 22.

And the uplink receiving module is used for receiving the HARQ-ACK codebook.

The downlink control signaling is as described in the embodiments of the first aspect and the second aspect of the present application, and will not be described here again.

The HRAQ-ACK codebook is as described in the embodiments of the first and second aspects of the present application and will not be described here again.

Preferably, the network device further includes a determining module 13, configured to determine, according to the first indication information, the second indication information, and the DAI value, an order of HARQ-ACK information in a HARQ-ACK codebook.

In a fourth aspect, the present application further proposes a mobile communication system comprising at least 1 terminal device 10 according to the third aspect of the present application and at least 1 network device 20 according to the fourth aspect of the present application.

In the terminal device of the embodiment of the application, the TRPIF indication is added to the downlink control signaling PDCCH to indicate whether the carrier scheduling is multi-TRP scheduling. When the TRPIF indicates multi-TRP scheduling, the specific TRP ID of scheduling is indicated by increasing N bits, and the total number of multi-TRP capable of being scheduled simultaneously has an upper limit value.

The DAI count value in the downlink control signaling sent by the single TRP downlink data is increased according to the scheduled PDSCH data, and the DAI total value is the total amount of the downlink data scheduled by the current downlink control signaling.

The DAI count value in the downlink control signaling sent by the multi-TRP downlink data is increased according to the scheduled TRP data, and the DAI total value is the total amount of the downlink data scheduled by the current downlink control signaling.

In the terminal device of the embodiment of the application, the HARQ-ACK fed back by the downlink data sent by a single TRP forms a first-class codebook, the HARQ-ACK fed back by the downlink data sent by multiple TRPs forms a second-class codebook, and the second-class codebook is placed behind the first-class codebook to form a final dynamic codebook.

For example, when a part of carriers open the CBG, HARQ-ACKs fed back by downlink data sent by a single TRP that does not open the CBG form a class III codebook and are class I codebooks, HARQ-ACKs fed back by downlink data sent by multiple TRPs that does not open the CBG form a class III codebook and are class II codebooks, HARQ-ACKs fed back by downlink data sent by a single TRP that opens the CBG form a class IV codebook and are class I codebooks, HARQ-ACKs fed back by downlink data sent by multiple TRPs that opens the CBG form a class IV codebook and are class II codebooks, and the four codebooks are sequentially arranged to form a final dynamic codebook.

In the present application, the DAI count value and the DAI total value of each type of codebook in the I, II, III, IV codebooks are counted separately.

The HARQ-ACK code words of various codebooks in I, II, III and IV are arranged according to the sequence of a carrier domain first and a time domain second, and when a downlink control channel schedules multiple TRPs (namely the time domain and the carrier domain are the same), the HARQ-ACK code words are arranged according to the sequence of the identifiers (namely TRP IDs) of the TRPs.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for multi-point transmission hybrid automatic repeat request (HARQ),

the downlink control signaling comprises first indication information, second indication information and a DAI value;

the first indication information is used for indicating whether the signaling is used for multi-TRP scheduling;

the second indication information is used for indicating the identification of TRP;

determining the HARQ-ACK codebook sequence by using the DAI value, the first indication information and the second indication information;

the downlink control signaling comprises a type I downlink control signaling and a type II downlink control signaling;

the DAI value corresponding to the type I downlink control signaling and the DAI value corresponding to the type II downlink control signaling are indicated independently;

the first indication information in the class I downlink control signaling indicates single TRP scheduling, and the first indication information in the class II downlink control signaling indicates a plurality of TRP scheduling;

carrying out HARQ-ACK codeword sequencing on downlink data sent by a single TRP according to a carrier domain first and a time domain second to generate a class I codebook; and carrying out HARQ-ACK codeword sequencing on downlink data sent by multiple TRPs according to a carrier wave first and a time domain second, and sequencing the codewords of the multiple TRPs at the same downlink control channel sending time according to the TRP IDs to generate a class II codebook.

2. The method of claim 1,

the downlink control signaling comprises a type III downlink control signaling and/or a type IV downlink control signaling;

the DAI value corresponding to the type III downlink control signaling and the DAI value corresponding to the type IV downlink control signaling are indicated independently;

the type III downlink control signaling is a downlink control signaling in a carrier wave for starting CBG; the type IV downlink control signaling is downlink control signaling in a carrier wave without starting CBG;

alternatively, the first and second electrodes may be,

the type III downlink control signaling is downlink control signaling in a carrier wave without starting CBG; and the type IV downlink control signaling is a downlink control signaling in a carrier wave for starting CBG.

3. The method of claim 2, wherein the HARQ-ACK codebook comprises, in the following order:

a class III codebook including HARQ-ACK information corresponding to a class III downlink control signaling;

and the IV type codebook comprises HARQ-ACK information corresponding to the IV type downlink control signaling.

4. The method of claim 1, wherein the HARQ-ACK codebook comprises, in the following order:

a class I codebook including HARQ-ACK information corresponding to a class I downlink control signaling;

and the II type codebook comprises HARQ-ACK information corresponding to the II type downlink control signaling.

5. The method of claim 1, wherein a HARQ-ACK codebook for carriers for which CBG is not turned on further comprises, in the following order:

6. The method of claim 1, wherein the HARQ-ACK codebook for a carrier with CBG turned on, in the following order, further comprises:

7. The method of any one of claims 2 to 6, wherein the HARQ-ACK codebook comprises, in the following order:

the class III codebook comprises HARQ-ACK information corresponding to the class III control signaling, wherein the type III codebook further comprises HARQ-ACK information of the class I downlink control signaling and/or the class II downlink control signaling;

and the IV-type codebook comprises HARQ-ACK information corresponding to the IV-type control signaling, and further comprises HARQ-ACK information of the I-type downlink control signaling and/or the II-type downlink control signaling.

8. The method according to any one of claims 1 to 6, wherein the first indication information is 0 for representing a single TRP.

9. The method according to any one of claims 1 to 6, wherein the first indication information is 1 for indicating a plurality of TRPs.

10. The method according to any of claims 1 to 6, wherein said second indication information is N bits for indicating the identity of N TRPs, said N being an integer value with an upper limit.

11. The method according to any one of claims 1 to 6,

the DAI value comprises a DAI count value and a DAI total value and is used for determining the HARQ-ACK information sequence; and the DAI count value is increased according to the number of the scheduled TRPs, and the DAI total value is the total number of the scheduled PDSCHs until the current downlink control signaling detection opportunity.

12. A terminal device, for implementing the method of any one of claims 1 to 11, comprising a downlink receiving module, a determining module, and an uplink sending module;

the downlink receiving module is configured to receive the downlink control signaling and identify the first indication information and the second indication information;

the determining module is configured to determine an order of HARQ-ACK information in an HARQ-ACK codebook according to the first indication information, the second indication information, and the DAI value;

and the uplink sending module is used for sending the HARQ-ACK codebook.

13. A network device for implementing the method of any one of claims 1 to 11, comprising a downlink sending module and an uplink receiving module;

the downlink sending module is configured to send the downlink control signaling, where the downlink control signaling includes the first indication information and the second indication information;

and the uplink receiving module is used for receiving the HARQ-ACK codebook.

14. A mobile communication system comprising at least 1 terminal device according to claim 12 and at least 1 network device according to claim 13.