CN112311506B

CN112311506B - Multicast communication feedback method, terminal equipment and system

Info

Publication number: CN112311506B
Application number: CN201910712378.7A
Authority: CN
Inventors: 沈霞; 朱颖
Original assignee: China Academy of Information and Communications Technology CAICT
Current assignee: China Academy of Information and Communications Technology CAICT
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2023-05-02
Anticipated expiration: 2039-08-02
Also published as: CN112311506A

Abstract

The invention discloses a multicast communication feedback method, terminal equipment and a system, which solve the problem of high feedback overhead of the existing method, equipment and system in a multicast communication scene. The method comprises the following steps: receiving a first transmission block, and if the first transmission block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group; and carrying and transmitting feedback information of NACK in the code block group on a feedback channel corresponding to the code block group identifier according to the configuration information. The method comprises the following steps: transmitting a first transmission block, and if the first transmission block is transmitted based on code block groups, enabling hybrid automatic repeat request feedback information detection for each code block group; and according to the configuration information, identifying the code block group through a feedback channel which receives NACK feedback information, and retransmitting the code block group. The terminal device uses the method. The system uses the terminal device. The invention realizes a transmission feedback mechanism based on the code block group for multicast communication.

Description

Multicast communication feedback method, terminal equipment and system

Technical Field

The present invention relates to the field of wireless mobile communications technologies, and in particular, to a multicast communication feedback method, a terminal device, and a system.

Background

In the internet of vehicles communication, multicast communication is an important application scenario, and in the current standard discussion, there are two candidate technical schemes related to hybrid automatic repeat request (HARQ) feedback of the multicast scenario, but the feedback design is designed for one Transmission Block (TB), and is not suitable for Code Block Group (CBG) transmission feedback, and there is no corresponding solution based on CBG feedback in the multicast scenario. If the feedback design based on the CBG in the existing unicast communication is applied to the multicast communication, if each receiving terminal (UE) is adopted to feed back the CBG detection result on the same feedback channel resource, because the CBG detection result of each receiving UE is different, different information is transmitted between different receiving UEs, and mutual interference can be generated on the same feedback channel resource; if each receiving UE adopts different feedback channel resources, the CBG detection result is fed back, and larger feedback overhead is introduced.

Disclosure of Invention

The invention provides a multicast communication feedback method, terminal equipment and a system, which solve the problems of mutual interference of detection results and high feedback overhead of the existing method, equipment and system in a multicast communication scene.

In order to solve the problems, the invention is realized in particular as follows:

In a first aspect, an embodiment of the present invention provides a feedback method for multicast communication, including the following steps: receiving a first transmission block, and if the first transmission block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group; and carrying and transmitting feedback information of NACK in the code block group on a feedback channel corresponding to the code block group identifier according to the configuration information.

Preferably, the feedback information of the code block group adopts a 1-bit semi-static codebook.

Preferably, feedback channels corresponding to different code block groups identified by the code block groups are distinguished by adopting a time division multiplexing or frequency division multiplexing mode.

Preferably, the configuration information at least includes 1 of the following information: the method comprises the steps of maximum value of code block groups, feedback channel resource configuration information, feedback channel format information and MCS configuration information adopted by a feedback channel.

Further, the method further comprises: simultaneously receiving a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group; and if the feedback information of the first transmission block and the second transmission block is in a merging state, carrying out phase-to-phase and sending feedback information of which the phase-to-phase result is NACK (negative acknowledgement) on a feedback channel corresponding to the code block group identifier, wherein the code block group identifier corresponds to the code block group detection result in the first transmission block and the second transmission block.

Further, when the configuration information indicates that a packet is received, the method further comprises: and carrying and transmitting feedback information of NACK in the code block group on a feedback channel corresponding to the code block group identifier and the grouping identifier according to the configuration information.

Preferably, the step of receiving the first transport block, if the first transport block is transmitted based on the code block groups, performing hybrid automatic repeat request feedback information detection on each code block group further includes: receiving a first transport block; if the first transport block is transmitted based on a set of code blocks, one or more of the set of code blocks are selected for hybrid automatic repeat request detection.

Preferably, the configuration information is obtained by at least one of the following modes: higher layer signaling, physical layer signaling, or protocol writing.

Further, the feedback channel resource location information is at least one of time domain resource location information, frequency domain resource location information and code domain resource location information.

In a second aspect, an embodiment of the present invention further provides a feedback method for multicast communication, including the following steps: transmitting a first transmission block, and if the first transmission block is transmitted based on code block groups, enabling hybrid automatic repeat request feedback information detection for each code block group; and according to the configuration information, identifying the code block group through a feedback channel which receives NACK feedback information, and retransmitting the code block group.

Preferably, the hybrid automatic repeat request feedback information of the code block group adopts a 1-bit semi-static codebook.

Preferably, the configuration information at least includes one of the following: the method comprises the steps of maximum value of code block groups, feedback channel resource configuration information, feedback channel format information and MCS configuration information adopted by a feedback channel.

Further, the method further comprises: simultaneously transmitting a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on code block groups, enabling hybrid automatic repeat request detection for each code block group; and if the feedback information of the first transmission block and the second transmission block is in a merging state, retransmitting the code block group corresponding to the code block group identifier in the first transmission block and/or the second transmission block according to the configuration information through receiving the feedback channel identification code block group identifier of the NAKC feedback information.

Further, when the configuration information indicates that a packet is received, the method further comprises: and retransmitting the corresponding code block group through the feedback channel identification code block group identification and the grouping identification which receive the NACK feedback information.

Preferably, the step of sending the first transport block, if the first transport block is transmitted based on code block groups, enables hybrid automatic repeat request feedback information detection for each code block group, further comprises: transmitting a first transport block; if the first transport block is transmitted based on the code block groups, one or more of the code block groups are selected for hybrid automatic repeat request feedback information detection.

In a third aspect, an embodiment of the present invention further provides a multicast communication feedback terminal device, including: the device comprises a receiving detection module, a sending module, a configuration module and a determination module; the receiving detection module is used for receiving a first transmission block, and if the first transmission block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group; the configuration module is used for acquiring configuration information; the determining module is used for determining feedback channel information corresponding to the code block group identifier according to the configuration information; and the sending module is used for bearing and sending feedback information of NACK (negative acknowledgement) in the code block group on a feedback channel corresponding to the code block group identifier.

Preferably, the receiving detection module is further configured to receive a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on a code block group, perform hybrid automatic repeat request detection on each code block group of the second transport block; the configuration module is further configured to configure a merging state for feedback information of the first transport block and the second transport block; the determining module is further configured to correspond to the same feedback channel information to the same code block group identifier in the first and second transmission blocks; and the sending module is further configured to carry and send feedback information, which is obtained by comparing a phase of a detection result of the code block group corresponding to the same code block group identifier in the first and second transmission blocks with a NACK, on a feedback channel corresponding to the code block group identifier.

Further, the configuration module is further configured to configure a packet identifier for the terminal device; the determining module is further configured to determine feedback channel information according to the packet identifier and the code block group identifier; and the sending module is also used for bearing and sending feedback information of NACK (negative acknowledgement) in the code block group on a feedback channel corresponding to the code block group identifier and the group identifier.

Further, the receiving detection module is further configured to select one or more code block groups to perform hybrid automatic repeat request detection according to the configuration information.

In a fourth aspect, an embodiment of the present invention further provides a multicast communication feedback terminal device, including: the device comprises a sending module, a receiving detection module, a configuration module and a determination module; the sending module is used for sending a first transmission block, and if the first transmission block is transmitted based on code block groups, enabling the hybrid automatic repeat request feedback information detection for each code block group; the configuration module is used for acquiring configuration information; the receiving and detecting module is used for receiving and detecting feedback information; the determining module is used for determining feedback channel information corresponding to the code block group identifier according to the configuration information; identifying NACK feedback information code block group identification through a feedback channel of feedback information; and the sending module is also used for retransmitting the corresponding code block group according to the identification of the NACK feedback information code block group identification.

Further, the sending module is further configured to send a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on a code block group, perform hybrid automatic repeat request feedback information detection on each code block group of the second transport block; the configuration module is further configured to configure a merging state for feedback information of the first transport block and the second transport block; the determining module is further configured to correspond to the same feedback channel information to the same code block group identifier in the first and second transport blocks; the sending module is further configured to resend the corresponding code block group in the first transport block and the second transport block by identifying the code block group identifier of the NACK feedback information.

Preferably, the configuration module is further configured to configure a packet identifier for the receiving end; the determining module is further used for determining feedback channel information corresponding to the grouping identifier and the code block group identifier; identifying the grouping identification through a feedback channel of feedback information; the sending module is further configured to resend the code block group corresponding to the first transport block according to the identified code block group identifier and the identified packet identifier.

Preferably, the sending module is further configured to select one or more code block groups to enable hybrid automatic repeat request feedback information detection according to the configuration information.

In a fifth aspect, the embodiment of the present invention further provides a multicast communication feedback system, which includes a receiving terminal and a transmitting terminal.

The beneficial effects of the invention include: the invention designs a feedback method based on CBG in multicast communication scene, which corresponds each CBG with different CBG identifiers to one different feedback channel resource, receives UE and only performs HARQ feedback on the CBG with NACK detection result on the corresponding feedback channel, sends UE to receive detection result from different feedback channels, and retransmits the CBG with NACK feedback. The method ensures that the transmitting UE can effectively acquire the HARQ detection results of different CBGs, can reduce signaling overhead of feedback based on the CBGs, and improves network efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 (a) is a method flow for receiving a multicast communication feedback embodiment of a UE;

fig. 1 (b) is a feedback channel configuration scheme for receiving a multicast communication feedback embodiment of a UE;

fig. 2 (a) is a method flow of an embodiment of multicast communication feedback including feedback information merge status;

fig. 2 (b) is a feedback channel configuration of a feedback embodiment of multicast communication including a feedback information merge state;

fig. 3 is a flowchart of an embodiment of a multicast communication feedback method including feedback information non-merging status;

fig. 4 (a) is a method flow of an embodiment of multicast communication feedback including packet identification;

fig. 4 (b) is a feedback channel configuration of a multicast communication feedback embodiment including packet identification;

fig. 5 is a flowchart of an embodiment of a multicast communication feedback method for transmitting a UE;

fig. 6 is a flowchart of an embodiment of a feedback method for multicast communication for transmitting UE including a feedback information combining status;

Fig. 7 is a flowchart of an embodiment of a feedback method for multicast communication for transmitting UEs, which includes a feedback information non-combining state;

fig. 8 is a flowchart of an embodiment of a multicast communication feedback method for transmitting UEs including packet identities;

fig. 9 is an embodiment of a feedback terminal device for received multicast communications;

fig. 10 is an embodiment of a feedback terminal device for multicast communication for transmission;

fig. 11 is an embodiment of a multicast communication feedback system.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the current standard discussion, there are two candidate technical solutions for HARQ feedback in a multicast scenario: scheme 1: the receiving UE feeds back NACK only to the sending UE (namely, if the HARQ detection result is NACK, the ACK is not fed back), and the same feedback channel resource is adopted; scheme 2: the receiving UE feeds back NACK and ACK to the sending UE, and different receiving UEs adopt different feedback channel resources. Both schemes are designed for one Transport Block (TB) transmission feedback, but not CBG feedback, and there is no corresponding solution based on CBG feedback in a multicast scenario.

CBG feedback is mainly applied to large packet transmission, and when one Transport Block (TB) is relatively large, in order to avoid transmission of the entire TB during retransmission, a feedback scheme is introduced to improve resource utilization efficiency. The main technical principle is that a TB is divided into a plurality of Code Block Groups (CBG) according to configuration, each CBG corresponds to one HARQ detection result, when UE configures CBG transmission in a cellular system, the UE needs to feed back the HARQ detection result of each CBG to network equipment, and the network equipment only retransmits the CBG for which NACK is fed back.

The innovation point of the invention is as follows: the invention creatively provides a CBG feedback mechanism suitable for a multicast communication scene, and solves the problem of feedback based on CBG transmission in the multicast communication scene; secondly, the multicast communication feedback method provided by the invention allocates the same feedback channel to the CBG with the same CBG identifier and allocates different feedback channels to the CBG with different CBG identifiers, thereby avoiding the mutual interference of different CBG feedback information and saving channel resources; thirdly, the invention uses 1 bit for the HARQ detection result of each CBG, and only returns the NACK detection result, thereby effectively reducing feedback overhead.

The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.

Example 1:

fig. 1 (a), (b) are diagrams of an embodiment of multicast communication feedback for receiving a UE.

Fig. 1 (a) is a process flow, specifically comprising the following steps:

step 101, receiving a first transport block, and if the first transport block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group.

In step 101, the first Transport Block (TB) includes one or more Code Block Groups (CBGs), and the receiving terminal device performs HARQ detection on the one or more CBGs of the first transport block, where the number of receiving terminal devices in unicast communication is 1, and the number of receiving terminal devices in multicast communication is 1 or more.

The communication feedback method of the present invention is applicable to multicast communication, but is also applicable to unicast communication.

It should be noted that whether the first transport block is enabled or disabled based on CBG transmission may be enabled or disabled by the configuration information. When the configuration information acquired by the receiving UE indicates that the first transport block is activated to be based on CBG transmission, the received first transport block is indicated to be based on CBG transmission, the hybrid automatic repeat request detection is required to be carried out on each code block group, and otherwise, the HARQ detection is carried out based on TB transmission.

In step 101, the method may further comprise:

in step 101A, a first transport block is received.

In step 101B, if the first transport block is transmitted based on a code block group, one or more of the code block groups are selected for hybrid automatic repeat request detection.

In step 101B, the receiving UE selects one or more code block groups of the first transport block for HARQ detection. The specific receiving UE selects which code block group in the first transport block to perform HARQ detection, which may be determined according to the configuration information.

Step 102, according to the configuration information, carrying and transmitting feedback information of NACK in the code block group on a feedback channel corresponding to the code block group identifier.

In step 102, the configuration information at least includes the following 1 information: the method comprises the steps of maximum value of code block groups, feedback channel resource configuration information, feedback channel format information and MCS configuration information adopted by a feedback channel.

Preferably, the maximum value of the code block group is the maximum value of the CBG when the multicast communication is based on CBG feedback. The maximum value of CBG is the maximum value of CBG contained in one transport block, and may include 1 or more candidate values, one of which is selected in the actual CBG-based feedback. It should be noted that, the number of the code block group identifiers is less than or equal to the maximum value of the code block group.

Preferably, the feedback channel format information indicates a format in which corresponding feedback information is generated for hybrid automatic repeat request (HARQ) feedback information corresponding to each CBG. The feedback channel format also corresponds to the method for generating the feedback information, and if the feedback channel format contains the configuration of the DMRS (Demodulation Reference Signal ), the feedback channel format information further corresponds to a method for generating the DMRS in the feedback channel.

Preferably, the feedback channel resource configuration information includes resource configuration information of a feedback channel (PSFCH) corresponding to each CBG, including time domain, frequency domain and code domain resource location information. Generally, the time domain resource location information includes a time slot location of the PSFCH, a starting symbol location in the time slot, and a number of persistent symbols; the frequency domain resource position information comprises the initial position of a physical resource block and the number of the physical resource blocks occupied by the frequency domain; the code domain resource location information includes an index of an initial cyclic shift or an orthogonal spreading code index.

It should be noted that, in the feedback channel resource configuration information, one CBG corresponds to one feedback channel (PSFCH), and the PSFCHs corresponding to different CBGs may be differentiated by using a time division multiplexing mode or a frequency division multiplexing mode, where the time division multiplexing mode is preferred. The time division multiplexing mode indicates that PSFCH resources corresponding to different CBGs are not overlapped in the time domain; the frequency division multiplexing mode indicates that PSFCH resources corresponding to different CBGs are not overlapped on a frequency domain.

It should be further noted that the feedback channel resource location information may include one or more of the time domain, frequency domain, and code domain resource location information, and specifically includes which information is to be determined according to the employed feedback channel format information. For example, if the feedback channel format information adopts the same format as the uplink PUCCH format 0, the feedback channel resource location information will contain the start symbol location, the number of persistent symbols, the physical resource block start location, and the index information of the initial cyclic shift.

It should be further noted that, the feedback channel resources based on CBG for multicast communication may be shared with other communication scenarios, such as unicast communication, non-CBG feedback for multicast communication, where the specific sharing situation is determined according to a protocol.

In step 102, the configuration information is obtained in at least one of the following manners: higher layer signaling, physical layer signaling, or protocol writing. The protocol writing indicates that the equipment sets related configuration parameters according to protocol convention, and related configuration information is not required to be acquired in an air interface mode; the higher layer signaling may be RRC signaling sent by the network device to the receiving UE over the downlink or RRC signaling sent by the transmitting UE to the receiving UE over the Side Link (SL); the physical layer signaling may be DCI signaling sent by the network device to the receiving UE through the downlink, or SCI signaling sent by the transmitting UE to the receiving UE through the SL.

Further, the configuration information may be one or more pieces of information, as well as a joint indication written by the UE device.

For example, multiple configuration information is sent through a high-layer signaling, and then one of the configuration information is adopted by the UE according to the self-capability of the equipment through a physical layer signaling or an instruction; specifically, one or more feedback channel resource sets related to the feedback of the multicast CBG may be configured for the higher layer signaling, where the one resource set includes one or more feedback channel resources, and the physical layer signaling may further indicate a feedback channel resource set index adopted by the feedback of the multicast CBG, and the receiving UE determines, according to a protocol convention, a correspondence between a specific CBG identifier in the feedback channel resource set and the feedback channel resource index in the set.

For another example, the configuration information is sent by higher layer signaling based on CBG maximum value and feedback channel resource configuration information in CBG transmission, and the UE writes feedback channel format information based on CBG feedback, MCS information adopted by the feedback channel, and the like, through the device.

For another example, for the feedback channel resource configuration information based on CBG feedback, the configuration information may send time domain location information of the feedback channel resource through higher layer signaling or physical layer signaling, and the UE determines frequency domain and code domain information of the feedback channel resource through device writing.

For another example, for CBG feedback in the UE grouping situation, the first configuration information may notify the UE of feedback channel resource set configuration information of different groups through higher layer signaling or physical layer signaling, and receive the UE to determine, according to a protocol convention, a grouping identifier and a CBG identifier of the UE to determine a grouping in which the UE is located and feedback channel resource configuration information corresponding to each CBG in the group, where a grouping Identifier (ID) of the UE may be a specific ID value of each receiving UE in a multicast communication scenario.

In step 102, the feedback information of the code block set adopts a 1-bit semi-static codebook. The HARQ detection result fed back by the receiving UE to each CBG is indicated by a semi-static codebook of 1 information bit, for example, 0 represents NACK, 1 represents ACK, or 0 represents ACK, 1 represents NACK. And feeding back only the CBG with the HARQ feedback information being NACK, and not feeding back the ACK.

In step 102, in the actual resource configuration, it may happen that one receiving UE needs to transmit CBG feedback corresponding NACK feedback information to different transmitting UEs on the same time-frequency resource, or to different PSSCHs of the same transmitting UE. At this time, according to the protocol convention or the received signaling instruction, when feedback information needs to be sent to different sending UEs on the same time-frequency resource, the UE selects to send the corresponding feedback information to one sending UE; when feedback information needs to be sent to different PSSCH transmissions of the same UE on the same time-frequency resource, selecting to send feedback information corresponding to one PSSCH or multiplexing a plurality of PSSCH transmission feedback into the same PSFCH transmission.

Fig. 1 (b) is a feedback channel configuration manner, which describes the correspondence between CBG identifiers and feedback channels in step 102:

in embodiment 1 of the present invention, the first transport block includes M CBGs, i.e., cbg_1, cbg_2, … …, cbg_m, and the code block group is identified as 1 to M, where M is an integer greater than or equal to 1. The CBG and the feedback channel establish a corresponding relation through the code block group identifier, wherein the code block group identifier is 1, the CBG_1 corresponds to the feedback channel PSFCH_1, the code block group identifier is 2, the CBG_2 corresponds to the feedback channel PSFCH_2, and the code block group identifier is M, the CBG_M corresponds to the feedback channel PSFCH_M.

One CBG corresponds to one feedback channel (PSFCH), and the PSFCHs corresponding to different CBGs may be distinguished by using a time division multiplexing manner or a frequency division multiplexing manner, wherein the time division multiplexing manner is preferable. The time division multiplexing mode indicates that PSFCHs corresponding to different CBGs are not overlapped in the time domain; the frequency division multiplexing mode indicates that PSFCHs corresponding to different CBGs do not overlap in a frequency domain.

The embodiment 1 of the invention provides a multicast communication feedback method, which innovatively applies a CBG feedback mechanism to allocate feedback channels according to code block group identifiers in a multicast communication scene, effectively avoids the interference of feedback information when different CBGs allocate the same feedback channels, also avoids the problem of higher signaling overhead when different feedback channels are allocated to the same CBGs, can improve the reliability of large data packet transmission in multicast communication, and reduces the resource overhead of large data packet retransmission.

Example 2:

fig. 2 (a) and (b) are diagrams illustrating an embodiment of feedback information combining status of multicast communication.

Fig. 2 (a) is a method flow, specifically comprising the following steps:

step 201, a first transport block is received, and if the first transport block is transmitted based on code block groups, hybrid automatic repeat request detection is performed on each code block group in the first transport block.

Step 201 is the same as step 101 in the first embodiment of the present invention.

Step 202, receiving a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group in the second transport block.

In step 202, as such, the receiving UE may select one or more CBGs in the second transport block for HARQ detection.

Step 203, if the feedback information of the first transport block and the second transport block is in a combined state, the detection results of the code block groups corresponding to the same code block group identifier in the first transport block and the second transport block are phase-separated, and the feedback information with the NACK result is carried and sent on a feedback channel corresponding to the code block group identifier.

In step 203, the detection result of the corresponding code block group is defined as:

If the feedback information of ACK is represented by 1 and the feedback information of NACK is represented by 0,

when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are all 1, the phase and the result are 1; when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are 1, 0 or 0 and 1 respectively, the phase and the result are 0; when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are all 0, the phase and the result are 0;

if the feedback information of ACK is represented by 0 and the feedback information of NACK is represented by 1,

when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are all 1, the phase and the result are 1; when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are 1, 0 or 0 and 1 respectively, the phase is 1; when the detection results corresponding to the same code block group identification in the first transmission block and the second transmission block are both 0, the phase and the result are 0.

In step 203, the merging status is indicated by the configuration information, and the reason why the feedback information of the first and second transport blocks is the merging status may be any of the following: the transmission of the current multicast communication is configured as the transmission of 2 TBs, but only CBG feedback channel resources meeting one TB are configured currently; CBG feedback channel resources satisfying two TBs are currently configured, but HARQ spatial bundling of PSFCH is configured to be "yes".

The HARQ space binding of the PSFCH is yes, which means that HARQ feedback information of the same CBG identifier transmitted by two TBs needs to be indicated by calculating information of only 1 bit.

It should be noted that, when the number of the code block groups of the first and second transport blocks is unequal, that is, the code block group identifier only appears in the first or second transport block, at this time, the feedback information carried on the feedback channel corresponding to the CBG identifier only indicates the detection result of the corresponding CBG in the first or second transport block.

In step 203, if the feedback information of the first transport block and the second transport block is in a combined state, 1 information bit in the feedback information corresponds to the HARQ detection result of the same CBG identifier from 2 transport blocks, and the result is after the and. That is, when any one or both of the CBGs having the same CBG identifier in the first and second transport blocks is NACK, feedback information is carried and sent on a feedback channel corresponding to the CBG identifier.

It should be noted that, when the code block group identifier only appears in the first or second transport block, if the HARQ detection result of the code block group corresponding to the code block group identifier is NACK, the feedback information is carried and sent on the feedback channel corresponding to the code block group identifier.

Fig. 2 (b) is a feedback channel configuration manner, which illustrates a correspondence between a code block group identifier and a feedback channel if feedback information of the first transport block and the second transport block is in a combined state when two transport blocks are simultaneously received in step 203:

and carrying out an AND result of the code block group HARQ detection results corresponding to the same code block group identifier in the first and second transmission blocks, wherein the feedback channel corresponding to the same code block group identifier in the first and second transmission blocks is PSFCH_1, the feedback channel corresponding to the CBG_1 of the code block group identifier 1 of the first transmission block TB1 and the CBG_1 of the code block group identifier 1 of the second transmission block TB2 is PSFCH_1, the feedback channel corresponding to the CBG_2 of the code block group identifier 2 of the first transmission block TB1 and the CBG_2 of the code block group identifier 2 of the second transmission block TB2 is PSFCH_2, and the like until the feedback channel corresponding to the CBG_M of the code block group identifier M of the first transmission block TB1 and the CBG_M of the code block group identifier M of the second transmission block TB2 is PSFCH_M.

In embodiment 2 of the present invention, the feedback information transmitted by the feedback channel is 1 bit, and is the HARQ detection result phase of the corresponding code block group and the subsequent result of the same code block group identification of the two transmission blocks.

For example, if the HARQ feedback information of cbg_1 of the first transport block is ACK and the HARQ feedback information of cbg_1 of the second transport block is NACK, the feedback information transmitted by the feedback channel is 1-bit NACK.

For another example, if the HARQ feedback information of cbg_1 of the first transport block is NACK and the HARQ feedback information of cbg_1 of the second transport block is NACK, the feedback information transmitted by the feedback channel is 1-bit NACK.

For example, if the HARQ feedback information of cbg_1 of the first transport block is ACK and the HARQ feedback information of cbg_1 of the second transport block is ACK, the feedback channel does not transmit feedback information

The feedback method of multicast communication provided by the second embodiment of the invention defines the feedback method when two TB are received and the feedback information is in a merging state, further improves the reliability of the feedback of the multicast communication based on CBG transmission and reduces the corresponding signaling overhead.

Example 3:

fig. 3 is a flowchart of a multicast communication feedback method including feedback information non-merging status.

The method specifically comprises the following steps:

step 301, a first transport block is received, and if the first transport block is transmitted based on code block groups, hybrid automatic repeat request detection is performed on each code block group in the first transport block.

Step 301 is the same as step 201 of the second embodiment of the present invention.

Step 302, receiving a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group in the second transport block.

Step 302 is the same as step 202 of the second embodiment of the present invention.

Step 303, if the feedback information of the first transport block and the second transport block is in a non-merging state, according to the configuration information, carrying and sending the feedback information of the NACK detected in the code block group of the first transport block and the second transport block on a feedback channel corresponding to the code block group identifier and the transport block identifier.

In step 303, the feedback information of the first transport block and the second transport block is in a non-merging state, that is, CBG feedback channel resources satisfying two TBs are currently configured, and HARQ space bundling of the configured PSFCH is no.

The HARQ space binding of the PSFCH is no, which indicates that the HARQ feedback information of the same CBG identifier transmitted by two TBs is indicated by 1 bit of information respectively.

In step 303, the first transport block and the second transport block correspond to different feedback channels, so that HARQ detection is performed on CBGs of the first transport block and the second transport block, and feedback information with NACK as a detection result is carried and sent on the corresponding feedback channels.

In embodiment 3 of the present invention, when two TBs are received and the two TBs do not share a feedback channel, the feedback method for multicast communication is further defined, so that reliability of transmission of different TBs is improved, and feedback overhead of multicast communication is saved.

Example 4:

fig. 4 (a) and (b) are multicast communication feedback embodiments including packet identification.

Fig. 4 (a) is a method flow, specifically comprising the following steps:

step 401, a first transport block is received, and if the first transport block is transmitted based on code block groups, hybrid automatic repeat request detection is performed on each code block group.

Step 401 is the same as step 101 in the first embodiment of the present invention.

Step 402, when the configuration information indicates that the packet is received, according to the configuration information, feedback information of NACK as a detection result in the code block group is carried and sent on a feedback channel corresponding to the code block group identifier and the packet identifier.

In step 402, the configuration information may further indicate a maximum number of UEs multiplexed on a feedback channel corresponding to one CBG in multicast communication, where N is assumed (N is an integer greater than 1). When the number of receiving UEs needing CBG feedback is greater than N in multicast communication, the receiving UEs need to be grouped, CBG feedback of the same CBG identifier of each UE in the same group adopts the same feedback channel resource, and receiving UEs in different groups adopt different feedback channel resources.

It should be noted that the feedback channel resources between different groups may be differentiated by time division multiplexing, or frequency division multiplexing, or code division multiplexing.

The configuration information needs to configure the feedback channel resources based on the CBG feedback for the UE of different groups and receive the grouping identification of the UE. The method for grouping the receiving UE may perform grouping using an ID related to the receiving UE, or using a distance between the receiving UE and the transmitting UE, or RSRP of a channel between the receiving UE and the transmitting UE. For example, the receiving UE with the same distance between the receiving UE and the sending UE is divided into a group, and the same grouping identification is configured for the receiving UE with the same distance; or dividing the receiving UE of which the RSRP of the channel between the receiving UE and the transmitting UE is in the same range into a group, and configuring the same group identification for the receiving UE in the range.

For example, for CBG feedback in the case of UE grouping, the configuration information may notify the UE of feedback channel resource set configuration information of different groups through higher layer signaling or physical layer signaling, and receive the feedback channel resource configuration information corresponding to each CBG in the group and the grouping identification of the UE and the identification of the CBG are determined by the UE according to the protocol convention.

Fig. 4 (b) is a feedback channel configuration manner, which illustrates the correspondence between packet identifiers, CBG identifiers and feedback channels in the receiving UE packets in step 402:

the configuration information may also indicate a maximum number of UEs multiplexed on a feedback channel corresponding to one CBG in multicast communication, where N is assumed (N is an integer greater than 1). When the number of receiving UEs needing CBG feedback is greater than N in multicast communication, the receiving UEs need to be grouped, feedback of the same CBG identifier of each UE in the same group adopts the same feedback channel resource, and receiving UEs in different groups adopt different feedback channel resources. Wherein the feedback channel resources between different groups may be distinguished by time division multiplexing, or frequency division multiplexing, or code division multiplexing. Regarding the received UE packet, the first configuration information needs to configure the feedback channel resource based on CBG feedback and the packet identifier where the receiving UE is located for UEs of different groups.

In embodiment 4 of the present invention, the receiving UEs are divided into 2 groups, that is, each CBG contains 2 pieces of the packet identifiers, where the packet identifiers of the CBGs received by the receiving terminal devices ue_1, ue_2, … … ue_n are 1, the packet identifiers of the CBGs received by the receiving terminal devices ue_n+1, ue_n+2, … … ue_k are 2, and M CBGs, cbg_1, cbg_2, … … cbg_m are received in the groups having the packet identifiers of 1 and 2.

Within the same group with the same group identification, the same CBG identification corresponds to the same feedback channel, within the group with the group identification 1, cbg_1 with the code block group identification 1 corresponds to the feedback channel psfch_1, cbg_2 with the code block group identification 2 corresponds to the feedback channel psfch_2, … …, and cbg_m with the code block group identification M corresponds to the feedback channel psfch_m.

Within the same group, identified as 2, the same CBG identification corresponds to the same feedback channel and different groups correspond to different feedback channels. The cbg_1 identified as 1 is assigned the feedback channel psfch_m+1, the cbg_2 identified as 2 is assigned the feedback channel psfch_m+2, … …, and the cbg_m identified as M is assigned the feedback channel psfch_m+m.

The 4 th embodiment of the invention further defines a multicast communication feedback method under the condition of receiving the packet.

Example 5:

fig. 5 is a flowchart of an embodiment of a multicast communication feedback method for transmitting a UE.

The method can be used for transmitting the UE and specifically comprises the following steps:

step 501, a first transport block is sent, and if the first transport block is transmitted based on code block groups, hybrid automatic repeat request feedback information detection is enabled for each code block group.

In step 501, the method may further comprise:

Step 501A, a first transport block is sent;

in step 501B, if the first transport block is transmitted based on a code block group, one or more of the code block groups are selected for hybrid automatic repeat request feedback information detection.

Note that HARQ detection may be enabled for all CBGs or selected CBGs of the first transport block, in particular whether all or selected CBGs may be determined by configuration information.

Step 502, according to the configuration information, the code block group is retransmitted through the feedback channel identification code block group identification received with NACK feedback information.

In step 502, the configuration information is the configuration information of the transmitting terminal device, which is the same as the configuration information of the receiving terminal in step 102.

In the application document, the configuration information of the sending terminal is the same as the configuration information of the receiving terminal, so as to ensure that the sending terminal and the receiving terminal of the multicast communication adopt the same CBG feedback configuration.

The configuration information is obtained in at least one of the following ways: higher layer signaling, physical layer signaling, or protocol writing. The protocol writing indicates that the equipment sets related configuration parameters according to protocol convention, and related configuration information is not required to be acquired in an air interface mode; the higher layer signaling may be RRC signaling sent by the network device to the transmitting UE via a downlink, or RRC signaling sent by other UEs to the transmitting UE via a Side Link (SL); the physical layer signaling may be DCI signaling sent by the network device to the transmitting UE via the downlink, or SCI signaling sent by other UEs to the receiving UE via the SL.

In step 502, the transmitting UE identifies, through the configuration information, a code block group identifier corresponding to the feedback channel through the feedback channel that receives the NACK feedback information, and further resends the code block group corresponding to the code block group identifier.

In step 502, the configuration information at least includes one of the following: the method comprises the steps of maximum value of code block groups, feedback channel resource configuration information, feedback channel format information and MCS configuration information adopted by a feedback channel.

The feedback method for multicast communication provided by the embodiment 5 of the invention can be used for the sending UE of multicast communication, and saves the expenditure for the retransmission feedback of large data packets.

Example 6:

fig. 6 is a flowchart of a multicast communication feedback method for transmitting UE including a feedback information combining status.

The method specifically comprises the following steps:

step 601, a first transport block is sent, and if the first transport block is transmitted based on code block groups, hybrid automatic repeat request feedback information detection is enabled for each code block group in the first transport block.

Step 601 is the same as step 501 in embodiment 5 of the present invention.

Step 602, simultaneously transmitting a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on a code block group, enabling hybrid automatic repeat request feedback information detection for each code block group in the second transport block.

Step 603, if the feedback information of the first transport block and the second transport block is in a combined state, according to the configuration information, retransmitting the code block group identified by the corresponding code block group in the first transport block and/or the second transport block by receiving the feedback channel identification code block group identification of the NACK feedback information.

In step 603, the sending UE may identify the code block group identifier corresponding to the feedback channel through the feedback channel of the received NACK feedback information, and for embodiment 6 of the present invention, the feedback information received by the sending UE is the result of detecting the same code block group identifier corresponding to the code block group identifier in the two transmission blocks and the subsequent result. And when the sending UE detects NACK feedback information on the feedback channel, retransmitting the code block group of the code block group identifier corresponding to the feedback channel in the first transmission block and the second transmission block.

In step 603, the definition of phase has been discussed in step 203 of embodiment 2 of the present invention, and the discussion is not repeated here.

It should be noted that, when the code block group identifier is only present in the first or second transport block, if the feedback channel of the feedback information received by the transmitting UE corresponds to the code block group identifier, the transmitting UE retransmits the CBG in the first transport block or the second transport block corresponding to the code block group identifier.

The 6 th embodiment of the present invention further defines a feedback method for multicast communication in the case that the code block groups with the same CBG identifier occupy the same feedback channel during the transmission of two TBs.

Example 7:

fig. 7 is a flowchart of an embodiment of a feedback method for multicast communication for transmitting UEs, which includes a feedback information non-combining state.

The method specifically comprises the following steps:

in step 701, a first transport block is sent, and if the first transport block is transmitted based on code block groups, hybrid automatic repeat request feedback information detection is enabled for each code block group in the first transport block.

Step 701 is the same as step 501 in embodiment 5 of the present invention.

Step 702, simultaneously transmitting a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on a code block group, enabling hybrid automatic repeat request feedback information detection for each code block group in the second transport block.

Step 702 is the same as step 602 in embodiment 6 of the present invention.

Step 703, if the feedback information of the first transport block and the second transport block is in a non-merging state, retransmitting the code block group of the corresponding code block group identifier in the first transport block and the second transport block according to the configuration information by receiving the feedback channel identification code block group identifier and the transport block identifier of the NACK feedback information.

In step 703, if the transport block identifier is 1, transmitting a code block group corresponding to the code block group identifier of the NACK feedback information identified in the first transport block; and if the transmission block identifier is 2, transmitting the code block group identifier of the NACK feedback information identified in the second transmission block to the corresponding code block group.

Example 8:

fig. 8 is a flowchart of an embodiment of a multicast communication feedback method for transmitting UEs including packet identities.

The method specifically comprises the following steps:

step 801, a first transport block is sent, and if the first transport block is transmitted based on code block groups, hybrid automatic repeat request feedback information detection is enabled for each code block group.

Step 801 is identical to step 501 in the fifth embodiment of the present invention.

Step 802, according to the configuration information, the code block group is retransmitted through the feedback channel identification code block group identification and the grouping identification which receive the NACK feedback information.

In step 802, the transmitting UE may identify, according to the configuration information, a CBG identifier and a packet identifier corresponding to the feedback channel through a feedback channel that receives feedback information, and may identify, through the CBG identifier and the packet identifier, a corresponding CBG, and retransmit the CBG.

The 8 th embodiment of the invention defines a multicast communication feedback method of transmitting UE when receiving UE packets.

Example 9:

fig. 9 is an embodiment of a feedback terminal device for received multicast communications.

The method according to any one of embodiments 1 to 4 of the present invention, comprising: the device comprises a receiving detection module 11, a sending module 12, a configuration module 13 and a determination module 14.

The terminal device in embodiment 9 of the present invention is a receiving terminal in SL multicast communication.

The receiving module is configured to receive a first transport block, and if the first transport block is transmitted based on code block groups, perform hybrid automatic repeat request detection on each code block group; the configuration module is used for acquiring configuration information; the determining module is used for determining feedback channel information corresponding to the code block group identifier according to the configuration information; and the sending module is used for bearing and sending feedback information of NACK (negative acknowledgement) in the code block group on a feedback channel corresponding to the code block group identifier.

Further, the receiving module is further configured to receive a second transport block, and if the second transport block is transmitted based on a code block group, perform hybrid automatic repeat request detection on each code block group of the second transport block; the configuration module is further configured to configure a merging state or a non-merging state for feedback information of the first transport block and the second transport block; the determining module is further configured to determine the same or different feedback channel information for the same code block group identifier in the first and second transport blocks; and the sending module is further configured to carry and send feedback information, which is obtained by comparing a phase of a detection result of the code block group corresponding to the same code block group identifier in the first and second transmission blocks with a NACK, on a feedback channel corresponding to the code block group identifier.

Further, the configuration module is further configured to allocate packet identifiers to the code block groups; the determining module is further configured to determine feedback channel information according to the packet identifier and the code block group identifier; and the sending module is also used for bearing and sending feedback information of NACK (negative acknowledgement) in the code block group on a feedback channel corresponding to the code block group identifier and the group identifier.

Further, the receiving detection module is further configured to select one or more code block groups to perform hybrid automatic repeat request detection according to the sending UE or the network device sending indication information or the protocol convention.

In embodiment 9 of the present invention, the configuration information may be sent by the sending terminal, may be sent by the network device, or may be written by a protocol contract.

Embodiment 10:

fig. 10 is an embodiment of a feedback terminal device for multicast communication for transmission.

A transmitting terminal for SL multicast communication, a feedback terminal device for multicast communication, using the method according to any one of embodiments 5 to 8 of the present invention, comprising: a transmitting module 21, a receiving detection module 22, a configuration module 23, and a determining module 24.

The sending module is used for sending a first transmission block, and if the first transmission block is transmitted based on code block groups, enabling hybrid automatic repeat request detection for each code block group; the configuration module is used for acquiring configuration information; the receiving and detecting module is used for receiving and detecting feedback information; the determining module is used for determining feedback channel information corresponding to the code block group identifier according to the configuration information; a feedback channel identification code block group identification through feedback information; the sending module is further configured to identify, through a feedback channel, a code block group identifier for feeding back NACK, and resend the corresponding code block group.

Further, the sending module is further configured to send a second transport block, and if the second transport block is transmitted based on a code block group, perform hybrid automatic repeat request detection on each code block group of the second transport block; the configuration module is further configured to configure a merging state or a non-merging state for feedback information of the first transport block and the second transport block; the determining module is further configured to determine the same or different feedback channel information for the same code block group identifier in the first and second transport blocks; the sending module is further configured to resend the corresponding code block group in the first transport block and/or the second transport block by identifying a code block group identifier for feeding back NACK information.

Further, the configuration module is further configured to configure a packet identifier for each code block group; the determining module is further used for identifying the grouping identification through a feedback channel of feedback information; the sending module is further configured to resend the code block group corresponding to the feedback NACK information in the first transport block according to the identified code block group identifier and the identified packet identifier.

Further, the sending module is further configured to send indication information, select one or more code block groups, and enable hybrid automatic repeat request detection.

In embodiment 10 of the present invention, the configuration information may be sent by the network device, or sent by another sending UE, or written by a protocol contract.

Example 11:

fig. 11 is an embodiment of a multicast communication feedback system.

The system comprises: the receiving terminal 1, using the terminal device in embodiment 9 of the present invention, further comprises: transmitting terminal 2, terminal device in embodiment 10 of the present invention is used.

The sending terminal is used for sending a first transmission block, and if the first transmission block is transmitted based on code block groups, enabling hybrid automatic repeat request feedback information detection for each code block group;

the sending terminal is further configured to determine feedback channel information corresponding to the code block group identifier according to the configuration information;

the receiving terminal is used for receiving a first transmission block, and if the first transmission block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group;

the receiving terminal is further configured to determine feedback channel information corresponding to the code block group identifier according to the configuration information;

the receiving terminal is further configured to carry and send feedback information, where the detection result in the code block group is NACK, on a feedback channel corresponding to the code block group identifier;

The sending terminal is further configured to receive detection feedback information, identify a code block group identifier according to a feedback channel and configuration information of the feedback information, and retransmit a code block group corresponding to the first transmission block.

In embodiment 11 of the present invention, it should be noted that the transmitting terminal includes all the functions of the terminal device in embodiment 10 of the present invention, and the receiving terminal includes all the functions of the terminal device in embodiment 9 of the present invention.

The 11 th embodiment of the present invention provides a multicast communication feedback system, which is not limited to the number of transmitting terminals and receiving terminals, and the multicast communication feedback method and the multicast communication feedback terminal device in the present invention are applied.

It should 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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

The foregoing is merely exemplary of the present invention and is not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are to be included in the scope of the claims of the present invention.

Claims

1. A multicast communication feedback method, comprising the steps of:

receiving a first transmission block, and if the first transmission block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group;

carrying and transmitting feedback information of NACK in the code block group on a feedback channel corresponding to the code block group identifier according to the configuration information;

the feedback channels corresponding to the code block groups with different code block groups are distinguished by adopting a time division multiplexing or frequency division multiplexing mode.

2. The multicast communication feedback method of claim 1 wherein the feedback information for the group of code blocks employs a 1-bit semi-static codebook.

3. The multicast communication feedback method of claim 1, wherein the configuration information comprises at least 1 of the following information: the method comprises the steps of maximum value of code block groups, feedback channel resource configuration information, feedback channel format information and MCS configuration information adopted by a feedback channel.

4. The multicast communication feedback method of claim 1, wherein the configuration information further comprises indication information to enable or disable code block group based transmission for the first transport block.

5. The multicast communication feedback method according to any of claims 1-4, wherein the method further comprises:

simultaneously receiving a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group;

and if the feedback information of the first transmission block and the second transmission block is in a merging state, carrying out phase-to-phase and sending feedback information of which the phase-to-phase result is NACK (negative acknowledgement) on a feedback channel corresponding to the code block group identifier, wherein the code block group identifier corresponds to the code block group detection result in the first transmission block and the second transmission block.

6. The multicast communication feedback method according to any of claims 1-4, wherein when the configuration information indicates reception of a packet, the method further comprises:

and carrying and transmitting feedback information of NACK in the code block group on a feedback channel corresponding to the code block group identifier and the grouping identifier according to the configuration information.

7. The multicast communication feedback method as claimed in any one of claims 1 to 4, wherein the step of receiving the first transport block, if the first transport block is transmitted based on the code block groups, performing hybrid automatic repeat request detection for each code block group, further comprises:

receiving a first transport block;

if the first transport block is transmitted based on a set of code blocks, one or more of the set of code blocks are selected for hybrid automatic repeat request detection.

8. The multicast communication feedback method according to any one of claims 1 to 4, wherein the configuration information is obtained by at least one of: higher layer signaling, physical layer signaling, or protocol writing.

9. The multicast communication feedback method of claim 3 wherein the feedback channel resource location information is at least one of time domain resource location information, frequency domain resource location information, code domain resource location information.

10. A multicast communication feedback method, comprising the steps of:

transmitting a first transmission block, and if the first transmission block is transmitted based on code block groups, enabling hybrid automatic repeat request feedback information detection for each code block group;

According to the configuration information, the code block group identification is identified through a feedback channel which receives NACK feedback information, and the code block group is retransmitted;

11. The multicast communication feedback method of claim 10 wherein the hybrid automatic repeat request feedback information of the code block group employs a 1-bit semi-static codebook.

12. The multicast communication feedback method of claim 10, wherein the configuration information comprises at least one of: the method comprises the steps of maximum value of code block groups, feedback channel resource configuration information, feedback channel format information and MCS configuration information adopted by a feedback channel.

13. The multicast communication feedback method of claim 10, wherein the configuration information further comprises indication information to enable or disable code block group based transmission for the first transport block.

14. The multicast communication feedback method according to any of claims 10-13, wherein the method further comprises:

simultaneously transmitting a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on code block groups, enabling hybrid automatic repeat request detection for each code block group;

And if the feedback information of the first transmission block and the second transmission block is in a merging state, retransmitting the code block group corresponding to the code block group identifier in the first transmission block and/or the second transmission block according to the configuration information by receiving the feedback channel identification code block group identifier of the NACK feedback information.

15. The multicast communication feedback method according to any of claims 10-13, wherein when the configuration information indicates that a packet is received, the method further comprises:

and retransmitting the corresponding code block group through the feedback channel identification code block group identification and the grouping identification which receive the NACK feedback information.

16. The multicast communication feedback method as claimed in any one of claims 10-13, wherein the step of transmitting the first transport block, if the first transport block is transmitted on a code block group basis, enabling hybrid automatic repeat request feedback information detection for each code block group, further comprises:

transmitting a first transport block;

if the first transport block is transmitted based on the code block groups, one or more of the code block groups are selected for hybrid automatic repeat request feedback information detection.

17. The multicast communication feedback method according to any one of claims 10 to 13, wherein the configuration information is obtained by at least one of: higher layer signaling, physical layer signaling, or protocol writing.

18. A multicast communication feedback terminal device using the method of any of claims 1-9, comprising: the device comprises a receiving detection module, a sending module, a configuration module and a determination module;

the receiving detection module is used for receiving a first transmission block, and if the first transmission block is transmitted based on code block groups, performing hybrid automatic repeat request detection on each code block group;

the configuration module is used for acquiring configuration information;

the determining module is used for determining feedback channel information corresponding to the code block group identifier according to the configuration information;

and the sending module is used for bearing and sending feedback information of NACK (negative acknowledgement) in the code block group on a feedback channel corresponding to the code block group identifier.

19. The multicast communication feedback terminal device of claim 18,

the receiving detection module is further configured to receive a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on a code block group, perform hybrid automatic repeat request detection on each code block group of the second transport block;

the configuration module is further configured to configure a merging state for feedback information of the first transport block and the second transport block;

The determining module is further configured to correspond to the same feedback channel information to the same code block group identifier in the first and second transmission blocks;

and the sending module is further configured to carry and send feedback information, which is obtained by comparing a phase of a detection result of the code block group corresponding to the same code block group identifier in the first and second transmission blocks with a NACK, on a feedback channel corresponding to the code block group identifier.

20. Multicast communication feedback terminal device according to any of the claims 18-19,

the configuration module is further configured to configure a packet identifier for the terminal device;

the determining module is further configured to determine feedback channel information according to the packet identifier and the code block group identifier;

and the sending module is also used for bearing and sending feedback information of NACK (negative acknowledgement) in the code block group on a feedback channel corresponding to the code block group identifier and the group identifier.

21. Multicast communication feedback terminal device according to any of the claims 18-19,

the receiving detection module is further configured to select one or more code block groups to perform hybrid automatic repeat request detection according to the configuration information.

22. A multicast communication feedback terminal device using the method of any of claims 10-17, comprising: the device comprises a sending module, a receiving detection module, a configuration module and a determination module;

The sending module is used for sending a first transmission block, and if the first transmission block is transmitted based on code block groups, enabling the hybrid automatic repeat request feedback information detection for each code block group;

the configuration module is used for acquiring configuration information;

the receiving and detecting module is used for receiving and detecting feedback information;

identifying code block group identification of NACK feedback information through a feedback channel of the feedback information;

and the sending module is also used for retransmitting the corresponding code block group according to the code block group identification for identifying the NACK feedback information.

23. The multicast communication feedback terminal device of claim 22,

the sending module is further configured to send a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on a code block group, perform hybrid automatic repeat request feedback information detection on each code block group of the second transport block;

The sending module is further configured to resend the corresponding code block group in the first transport block and/or the second transport block by identifying the code block group identifier for feeding back NACK information.

24. Multicast communication feedback terminal device according to any of the claims 22-23,

the configuration module is also used for configuring a grouping identifier for the receiving end;

the determining module is further used for determining feedback channel information corresponding to the grouping identifier and the code block group identifier; identifying the grouping identification through a feedback channel of feedback information;

the sending module is further configured to resend the code block group corresponding to the first transport block according to the identified code block group identifier and the identified packet identifier.

25. Multicast communication feedback terminal device according to any of the claims 22-23,

the sending module is further configured to select one or more code block groups to enable detection of feedback information of the hybrid automatic repeat request according to the configuration information.

26. A multicast communication feedback system comprising a receiving terminal, a terminal device according to any of claims 18-21, and a transmitting terminal, a terminal device according to any of claims 22-25.