CN112311506A

CN112311506A - Multicast communication feedback method, terminal equipment and system

Info

Publication number: CN112311506A
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: 2021-02-02
Anticipated expiration: 2039-08-02
Also published as: CN112311506B

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, comprising: 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 according to the configuration information, carrying and sending the feedback information of which the detection result is NACK in the code block group on a feedback channel corresponding to the code block group identifier. The method, comprising: sending a first transport block, and enabling hybrid automatic repeat request feedback information detection for each code block group if the first transport block is transmitted based on the code block group; according to the configuration information, the code block group identity is identified through a feedback channel receiving NACK feedback information, and the code block group is retransmitted. The terminal equipment uses the method. The system uses the terminal device. The invention realizes the 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 communication of the internet of vehicles, multicast communication is an important application scenario, and in the current standard discussion, there are two candidate technical solutions for hybrid automatic repeat request (HARQ) feedback of the multicast scenario, but both of them are designed for feedback of one Transport Block (TB), and are 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 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, different receiving UEs transmit different information due to different CBG detection results of each receiving UE, and mutual interference can be generated on the same feedback channel resource; if each receiving UE adopts different feedback channel resources, the CBG detection results are all 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 above problems, the present invention is specifically realized as follows:

in a first aspect, an embodiment of the present invention provides a multicast communication feedback method, 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 according to the configuration information, carrying and sending the feedback information of which the detection result is NACK in the code block group on a feedback channel corresponding to the code block group identifier.

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

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

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

Further, the method further comprises: receiving a second transmission block of the same HARQ process as the first transmission block, and if the second transmission block is transmitted based on the 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, performing an AND operation on the detection results of the code block groups corresponding to the same code block group identifier in the first transmission block and the second transmission block, and carrying and sending the feedback information of which the result is NACK on a feedback channel corresponding to the code block group identifier.

Further, when the configuration information indicates to receive a packet, the method further comprises: and according to the configuration information, carrying and sending the feedback information of which the detection result is NACK in the code block group on a feedback channel corresponding to the code block group identifier and the grouping identifier.

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

Preferably, the configuration information is acquired in at least one of the following manners: 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 multicast communication feedback method, including the following steps: sending a first transport block, and enabling hybrid automatic repeat request feedback information detection for each code block group if the first transport block is transmitted based on the code block group; according to the configuration information, the code block group identity is identified through a feedback channel receiving NACK feedback information, and the code block group is retransmitted.

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

Preferably, the configuration information at least includes one of: the maximum value of the code block group, the resource configuration information of the feedback channel, the format information of the feedback channel and the MCS configuration information adopted by the feedback channel.

Further, the method further comprises: simultaneously sending a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on the code block group, starting 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, identifying the code block group identification through a feedback channel receiving the NAKC feedback information according to the configuration information, and retransmitting the code block group corresponding to the code block group identification in the first transmission block and/or the second transmission block.

Further, when the configuration information indicates to receive a packet, the method further comprises: and identifying the code block group identification and the grouping identification through a feedback channel receiving NACK feedback information, and retransmitting the first corresponding code block group.

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

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 performing hybrid automatic repeat request detection on each code block group if the first transmission block is transmitted based on the code block group; the configuration module is used for acquiring configuration information; the determining module is configured to determine, according to the configuration information, feedback channel information corresponding to the code block group identifier; and the sending module is used for carrying and sending the feedback information of which the detection result is NACK in the code block group on a feedback channel corresponding to the code block group identifier.

Preferably, the receiving and detecting module is further configured to receive a second transport block in the same HARQ process as the first transport block, and if the second transport block is transmitted based on the code block groups, 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 merge state for the feedback information of the first transport block and the second transport block; the determining module is further configured to identify the same feedback channel information corresponding to the same code block group identifier in the first and second transport blocks; the sending module is further configured to carry and send feedback information, of which the phase of the code block group detection result corresponding to the same code block group identifier in the first and second transport blocks is NACK, on a feedback channel corresponding to the code block group identifier.

Further, the configuration module is further configured to configure a group identifier for the terminal device; the determining module is further configured to determine feedback channel information according to the grouping identifier and the code block group identifier; the sending module is further configured to carry and send feedback information, of which the detection result is NACK, in the code block group on a feedback channel corresponding to the code block group identifier and the grouping identifier.

Further, the receiving detection module is further configured to select one or more code block groups for 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 configured to send a first transport block, and if the first transport block is transmitted based on a code block group, enable hybrid automatic repeat request feedback information detection for each code block group; the configuration module is used for acquiring configuration information; the receiving detection module is used for receiving and detecting feedback information; the determining module is configured to determine, according to the configuration information, feedback channel information corresponding to the code block group identity; identifying a NACK feedback information code block group identifier through a feedback channel of the feedback information; the sending module is further configured to resend the corresponding code block group according to the code block group identifier for identifying the NACK feedback information.

Further, the sending module is further configured to send a second transport block in the same HARQ process as the first transport block, and if the second transport block is transmitted based on the code block groups, perform HARQ feedback information detection on each code block group of the second transport block; the configuration module is further configured to configure a merge state for the feedback information of the first transport block and the second transport block; the determining module is further configured to identify the same code block group in the first and second transport blocks corresponding to the same feedback channel information; the sending module is further configured to resend the corresponding code block groups 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 group identifier for the receiving end; the determining module is further configured to determine feedback channel information corresponding to the group identifier and the code block group identifier; identifying a grouping identifier through a feedback channel of the feedback information; the sending module is further configured to resend the code block group corresponding to the first transport block through the identified code block group identifier and the identified grouping 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, an embodiment of the present invention further provides a multicast communication feedback system, including a receiving terminal and a sending terminal.

The beneficial effects of the invention include: the invention designs a feedback method based on CBG in a multicast communication scene, which corresponds each CBG with different CBG identifications to a different feedback channel resource, receives the HARQ feedback of the UE on the corresponding feedback channel only for the CBG with NACK detection result, sends the HARQ feedback of the UE on the different feedback channels to receive the detection result, and retransmits the CBG with NACK feedback. The method ensures that the sending UE can effectively obtain the HARQ detection results of different CBGs, can reduce the signaling overhead of feedback based on the CBGs and improve the 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 not to limit the invention. In the drawings:

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

fig. 1(b) is a feedback channel configuration for receiving a feedback embodiment of multicast communication 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 an embodiment of multicast feedback including a feedback information merging status;

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

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 an embodiment of multicast communication feedback including a packet identifier;

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 method for multicast communication feedback for a transmitting UE including a feedback information combining status;

fig. 7 is a flowchart of an embodiment of a multicast communication feedback method for transmitting a UE including a feedback information non-merging status;

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

fig. 9 is an embodiment of a feedback end device for received multicast communication;

fig. 10 is an embodiment of a multicast communication feedback terminal device 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 the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.

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

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

The innovation points of the invention are as follows: the invention provides a CBG feedback mechanism applicable to a multicast communication scene innovatively, 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 identification and allocates different feedback channels to the CBGs with different CBG identifications, thereby avoiding the mutual interference of the feedback information of different CBGs and saving the channel resource; thirdly, the HARQ detection result of each CBG is identified by 1 bit, and only the NACK detection result is returned, thereby effectively reducing the feedback overhead.

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

Example 1:

fig. 1(a) and (b) illustrate an embodiment of multicast communication feedback for a receiving UE.

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

step 101, receiving a first transport block, and if the first transport block is transmitted based on a code block group, 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 end device performs HARQ detection on the one or more CBGs of the first transport block, where the number of the receiving end devices is 1 in unicast communication, and the number of the receiving end devices is greater than or equal to 1 in multicast communication.

The communication feedback method according to 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 performed through configuration information. When the configuration information acquired by the receiving UE indicates that the first transport block is activated to be transmitted based on the CBG, the received first transport block is transmitted based on the CBG, and hybrid automatic repeat request detection needs to be performed on each code block group, otherwise, HARQ detection is performed based on TB transmission.

In step 101, the method may further comprise:

step 101A, a first transport block is received.

Step 101B, if the first transport block is transmitted based on the code block group, selecting one or more of the code block groups for harq detection.

In step 101B, the receiving UE selects one or more groups of code blocks of the first transport block for HARQ detection. Specifically, the 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.

And 102, according to the configuration information, carrying and sending the feedback information of which the detection result is 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 maximum value of the code block group, the resource configuration information of the feedback channel, the format information of the feedback channel and the MCS configuration information adopted by the feedback channel.

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

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

Preferably, the feedback channel resource allocation information includes resource allocation 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 slot location of the PSFCH, a starting symbol location in the slot, and a number of persistent symbols; the frequency domain resource position information comprises the starting position of the physical resource block and the number of 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 PSFCHs corresponding to different CBGs may be distinguished by using a time division multiplexing method or a frequency division multiplexing method, where the time division multiplexing method is preferred. The time division multiplexing mode indicates that PSFCH resources corresponding to different CBGs do not overlap in a time domain; the frequency division multiplexing mode indicates that the PSFCH resources corresponding to different CBGs do not overlap in the frequency domain.

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

It should be further noted that, regarding multicast communication, the CBG-based feedback channel resource may be shared with other communication scenarios, such as unicast communication, and non-CBG feedback of multicast communication, where the specific sharing condition 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-in means 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 through a downlink, or RRC signaling sent by the sending UE to the receiving UE through a Side Link (SL); the physical layer signaling may be DCI signaling sent by the network device to the receiving UE through downlink, or SCI signaling sent by the sending UE to the receiving UE through SL.

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

For example, a plurality of kinds of configuration information are sent through a high-level signaling, and then a physical layer signaling or an instruction is given to the UE to adopt one kind of configuration information according to the self capability of the equipment; specifically, for example, one or more feedback channel resource sets related to the multicast CBG feedback are configured for the high-level signaling, where one resource set includes one or more feedback channel resources, the physical layer signaling may further indicate a feedback channel resource set index adopted for the multicast CBG feedback, and the receiving UE determines, according to a protocol agreement, 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 sends the CBG maximum value and the feedback channel resource configuration information during CBG transmission through a higher layer signaling, and the UE writes and determines the feedback channel format information based on CBG feedback, the 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 a higher layer signaling or a physical layer signaling, and the UE writes frequency domain and code domain information, etc. that determine the feedback channel resource through the device.

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

In step 102, a 1-bit semi-static codebook is used as the feedback information of the code block group. The HARQ detection result fed back by the receiving UE for each CBG is indicated by using a semi-static codebook of 1 information bit, for example, 0 indicates NACK, 1 indicates ACK, or 0 indicates ACK, and 1 indicates NACK. And feeding back only the CBG of which the HARQ feedback information is NACK, and not feeding back the ACK.

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

Fig. 1(b) illustrates a feedback channel configuration manner, which describes a corresponding relationship between the CBG identifier and the feedback channel in step 102:

in embodiment 1 of the present invention, the first transport block includes M CBGs, i.e., CBG _1, CBG _2, … …, and CBG _ M, the code block group identifier is 1 to M, and 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 identification, the CBG _1 with the code block group identification of 1 corresponds to the feedback channel PSFCH _1, the CBG _2 with the code block group identification of 2 corresponds to the feedback channel PSFCH _2, and the CBG _ M with the code block group identification of M corresponds to the feedback channel PSFCH _ M.

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

The embodiment 1 of the present invention provides a multicast communication feedback method, which innovatively applies a CBG feedback mechanism to a multicast communication scenario, and allocates feedback channels according to code block group identifiers, thereby effectively avoiding interference of feedback information when different CBGs are allocated with the same feedback channel, and also avoiding a problem of high signaling overhead when different CBGs are allocated with different feedback channels, and thus improving reliability of transmission of a large data packet in multicast communication and reducing resource overhead of retransmission of the large data packet.

Example 2:

fig. 2(a) and (b) illustrate an embodiment of multicast feedback including a feedback information merging status.

Fig. 2(a) is a process flow, which specifically includes the following steps:

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

In step 202, likewise, 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 transmission block and the second transmission block is in a merged state, performing an and operation on the detection results of the code block groups corresponding to the same code block group identifier in the first transmission block and the second transmission block, and carrying and sending the feedback information of which the result is NACK on a feedback channel corresponding to the code block group identifier.

In step 203, the detection result of the code block group corresponding to the same code block group id in the first and second transport blocks is anded, which 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 both 1, the phase and result is 1; when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are respectively 1, 0 or 0, 1, the phase and result is 0; when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are both 0, the phase and result is 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 both 1, the phase and result is 1; when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are respectively 1, 0 or 0, 1, the phase and result is 1; and when the detection results corresponding to the same code block group identifiers in the first transmission block and the second transmission block are both 0, the phase and result is 0.

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

The binding of the HARQ space of the PSFCH to "yes" indicates that HARQ feedback information of the same CBG identifier transmitted by two TBs needs to be indicated by calculating only 1-bit information.

It should be noted that, when the number of code block groups of the first transport block and the second transport block is not equal, that is, the code block group identifier only appears in the first transport block or the 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 transport block or the second transport block.

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

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, and describes a corresponding relationship between a code block group identifier and a feedback channel if the feedback information of the first transport block and the second transport block is in a merged state when two transport blocks are received simultaneously in step 203:

and one feedback channel corresponding to the same code block group identifier in the first and second transport blocks, where the feedback channel carries the result after the and of the HARQ detection result of the code block group corresponding to the same code block group identifier in the first and second transport blocks, the feedback channel corresponding to CBG _1 with code block group identifier 1 of the first transport block TB1 and CBG _1 with code block group identifier 1 of the second transport block TB2 is PSFCH _1, the feedback channel corresponding to CBG _2 with code block group identifier 2 of the first transport block TB1 and CBG _2 with code block group identifier 2 of the second transport block TB2 is PSFCH _2, and so on until the feedback channel corresponding to CBG _ M with code block group identifier M of the first transport block TB1 and CBG _ M with code block group identifier M of the second transport block TB2 is PSFCH _ M.

In embodiment 2 of the present invention, feedback information transmitted by the feedback channel is 1 bit, and a HARQ detection result phase and a subsequent result of a code block group corresponding to the same code block group identifier for two transport blocks are obtained.

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 NACK of 1 bit.

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 NACK of 1 bit.

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 send feedback information

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

Example 3:

fig. 3 is a flowchart of an embodiment of a multicast communication feedback method including a non-merged feedback information state.

The method specifically comprises the following steps:

step 301, receiving a first transport block, and if the first transport block is transmitted based on the code block groups, performing hybrid automatic repeat request detection 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 the code block groups, performing HARQ 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-merged state, according to the configuration information, carrying and sending the feedback information, of which the detection result is NACK, 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-merged state, that is, CBG feedback channel resources satisfying two TBs are currently configured, and the configured HARQ space of the PSFCH is bound to be "no".

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

In step 303, the first and second transport blocks both correspond to different feedback channels, so HARQ detection is performed on CBGs of the first and second transport blocks, and the feedback information whose detection result is NACK is carried on the corresponding feedback channels and sent.

In embodiment 3 of the present invention, the multicast communication feedback method is further specified when two TBs are received and the two TBs do not share a feedback channel, thereby improving the reliability of transmission of different TBs and saving the feedback overhead of multicast communication.

Example 4:

fig. 4(a), (b) show an embodiment of multicast feedback including packet identification.

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

step 401, receiving a first transport block, and if the first transport block is transmitted based on a code block group, performing hybrid automatic repeat request detection 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 to receive the packet, according to the configuration information, carrying and sending the feedback information of which the detection result is NACK in the code block group on the 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 the receiving UEs needing CBG feedback is larger than N in multicast communication, the receiving UEs need to be grouped, the CBG feedback of the same CBG identification of each UE in the same group adopts the same feedback channel resource, and the receiving UEs in different groups adopt different feedback channel resources.

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

The configuration information needs to configure the feedback channel resource based on CBG feedback and the group identifier where the receiving UE is located for different groups of UEs. The grouping method for the receiving UE may be performed by using an ID related to distinguishing the receiving UE, or by using a distance between the receiving UE and the sending UE, or by using RSRP of a channel between the receiving UE and the sending UE. For example, the receiving UEs with the same distance range between the receiving UE and the sending UE are grouped into a group, and the receiving UEs in the group are configured with the same group identifier; or grouping the receiving UEs with the RSRP of the channel between the receiving UE and the sending UE in the same range into a group, and configuring the same group identification for the receiving UEs in the range.

For example, for CBG feedback under the condition of UE grouping, the configuration information may notify the feedback channel resource set configuration information of different groups of the UE through a high layer signaling or a physical layer signaling, and the receiving UE determines the group where the receiving UE is located and the feedback channel resource configuration information corresponding to each CBG in the group by using the group identifier of the UE and the identifier of the CBG according to a protocol agreement.

Fig. 4(b) illustrates a feedback channel configuration manner, which illustrates a corresponding relationship between the group identifier, the CBG identifier and the feedback channel when the UE packet is received 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, assuming that N is N (N is an integer greater than 1). When the number of the receiving UEs needing CBG feedback is larger than N in multicast communication, the receiving UEs need to be grouped, the feedback of the same CBG identification of each UE in the same group adopts the same feedback channel resource, and the receiving UEs in different groups adopt different feedback channel resources. Wherein the feedback channel resources between different groups can be distinguished by time division multiplexing, or frequency division multiplexing, or code division multiplexing. Regarding the receiving UE group, the first configuration information needs to configure the feedback channel resource based on CBG feedback and the group identifier where the receiving UE is located for UEs in different groups.

In the 4 th embodiment of the present invention, the receiving UEs are divided into 2 groups, that is, each CBG contains 2 packet ids, where the packet id of the CBG received by the receiving terminal devices UE _1, UE _2, … … UE _ n is 1, the packet id of the CBG received by the receiving terminal devices UE _ n +1, UE _ n +2, … … UE _ K is 2, and M CBGs, CBG _1, CBG _2, … … CBG _ M, are received in each of the groups with packet id 1 and packet id 2.

In the same group with the same grouping identifier, the same CBG identifier corresponds to the same feedback channel, in the group with the grouping identifier of 1, CBG _1 with code block group identifier of 1 corresponds to feedback channel PSFCH _1, CBG _2 with code block group identifier of 2 corresponds to feedback channels PSFCH _2, … …, and CBG _ M with code block group identifier of M corresponds to feedback channel PSFCH _ M.

In the same group with the packet identifier 2, the same CBG identifier corresponds to the same feedback channel, and different groups correspond to different feedback channels. The feedback channel PSFCH _ M +1 is allocated to CBG _1 with the code block group identification of 1, the feedback channel PSFCH _ M +2, … … is allocated to CBG _2 with the code block group identification of 2, and the feedback channel PSFCH _ M + M is allocated to CBG _ M with the code block group identification of M.

Embodiment 4 of the present invention further specifies a multicast communication feedback method in the case of receiving a packet.

Example 5:

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

The method can be used for sending 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 a code block group, hybrid automatic repeat request feedback information detection is enabled for each code block group.

In step 501, the method may further include:

step 501A, sending a first transport block;

step 501B, if the first transport block is transmitted based on the code block group, selecting one or more of the code block groups for harq feedback information detection.

It should be noted that HARQ detection may be enabled for all CBGs or selected CBGs of the first transport block, and specifically, all or selected CBGs may be determined by the configuration information.

Step 502, according to the configuration information, identifying the code block group identity through the feedback channel receiving the NACK feedback information, and retransmitting the code block group.

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

In this 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 multicast communication adopt the same CBG feedback configuration.

The configuration information is acquired in at least one of the following manners: higher layer signaling, physical layer signaling, or protocol writing. The protocol writing-in means 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 sending UE through a downlink, or RRC signaling sent by other UEs to the sending UE through a Side Link (SL); the physical layer signaling may be DCI signaling sent by the network device to the sending UE via downlink, or SCI signaling sent by other UEs to the receiving UE via SL.

In step 502, the sending UE identifies the code block group identifier corresponding to the feedback channel through the configuration information by using the feedback channel receiving the NACK feedback information, and then retransmits the code block group corresponding to the code block group identifier.

In step 502, the configuration information at least includes one of the following items: the maximum value of the code block group, the resource configuration information of the feedback channel, the format information of the feedback channel and the MCS configuration information adopted by the feedback channel.

The multicast communication feedback method provided in embodiment 5 of the present invention may be used for sending UE for multicast communication, and saves overhead for retransmission feedback of a large data packet.

Example 6:

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

The method specifically comprises the following steps:

step 601, sending a first transport block, and if the first transport block is transmitted based on the code block groups, enabling hybrid automatic repeat request feedback information detection 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, a second transport block in the same HARQ process as the first transport block is sent at the same time, and if the second transport block is transmitted based on the code block group, hybrid automatic repeat request feedback information detection is enabled for each code block group in the second transport block.

Step 603, if the feedback information of the first transmission block and the second transmission block is in a merging state, according to the configuration information, identifying the code block group identifier by the feedback channel receiving the NACK feedback information, and retransmitting the code block group of the code block group identifier corresponding to the first transmission block and/or the second transmission block.

In step 603, the sending UE can 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 sending UE receives feedback information that is a result of a code block group detection result phase and a subsequent result corresponding to the same code block group identifier in the two transport blocks. And when the sending UE detects NACK feedback information on the feedback channel, resending the code block group of the code block group identification corresponding to the feedback channel in the first transmission block and the second transmission block.

In step 603, the definition of the phase and has already 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 only appears in the first or second transport block, if the feedback channel on which the sending UE receives the feedback information corresponds to the code block group identifier, the sending UE retransmits the CBG in the first transport block or the second transport block corresponding to the code block group identifier.

Embodiment 6 of the present invention further defines a multicast communication feedback method when code block groups with the same CBG identifier occupy the same feedback channel during transmission of two TBs.

Example 7:

fig. 7 is a flowchart of an embodiment of a multicast communication feedback method for a transmitting UE including a feedback information non-combining state.

The method specifically comprises the following steps:

step 701, sending a first transport block, and if the first 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 first transport block.

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

Step 702, a second transport block in the same HARQ process as the first transport block is sent at the same time, and if the second transport block is transmitted based on the code block group, hybrid automatic repeat request feedback information detection is enabled 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 transmission block and the second transmission block is in a non-merged state, identifying the code block group identifier and the transmission block identifier through the feedback channel receiving the NACK feedback information according to the configuration information, and retransmitting the code block group of the code block group identifier corresponding to the first transmission block and the second transmission block.

In step 703, if the transport block identifier is 1, sending 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, sending the code block group corresponding to the code block group identifier of the NACK feedback information identified in the second transmission block.

Example 8:

fig. 8 is a flowchart of an embodiment of a multicast communication feedback method for a sending UE including a packet identifier.

The method specifically comprises the following steps:

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

Step 801 is the same as step 501 in the fifth embodiment of the present invention.

Step 802, according to the configuration information, identifying the code block group identifier, the grouping identifier by the feedback channel receiving the NACK feedback information, and retransmitting the code block group.

In step 802, the sending UE may identify the CBG id and the group id corresponding to the feedback channel according to the configuration information through the feedback channel receiving the feedback information, and may identify the corresponding CBG through the CBG id and the group id to resend the CBG.

Embodiment 8 of the present invention specifies a multicast communication feedback method for transmitting UE when receiving a UE packet.

Example 9:

fig. 9 is an embodiment of a feedback end device for receiving multicast communication.

The method of any of embodiments 1-4 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 a code block group, perform hybrid automatic repeat request detection on each code block group; the configuration module is used for acquiring configuration information; the determining module is configured to determine, according to the configuration information, feedback channel information corresponding to the code block group identifier; and the sending module is used for carrying and sending the feedback information of which the detection result is NACK 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 the code block groups, 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 merge state or a non-merge state for the 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 carry and send feedback information, of which the phase of the code block group detection result corresponding to the same code block group identifier in the first and second transport blocks is NACK, on a feedback channel corresponding to the code block group identifier.

Further, the configuration module is further configured to assign a group identifier to the code block group; the determining module is further configured to determine feedback channel information according to the grouping identifier and the code block group identifier; the sending module is further configured to carry and send feedback information, of which the detection result is NACK, in the code block group on a feedback channel corresponding to the code block group identifier and the grouping identifier.

Further, the receiving and detecting module is further configured to select one or more code block groups for hybrid automatic repeat request detection according to indication information sent by the sending UE or the network device, or a protocol agreement.

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

Embodiment 10:

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

A sending terminal applicable to SL multicast communication, a multicast communication feedback terminal device, using the method according to any one of embodiments 5 to 8 of the present invention, includes: the device comprises a sending module 21, a receiving detection module 22, a configuration module 23 and a determination module 24.

The sending module is configured to send a first transport block, and if the first transport block is transmitted based on a code block group, enable hybrid automatic repeat request detection for each code block group; the configuration module is used for acquiring configuration information; the receiving detection module is used for receiving and detecting feedback information; the determining module is configured to determine, according to the configuration information, feedback channel information corresponding to the code block group identity; identifying code block group identification through a feedback channel of feedback information; the sending module is further configured to identify, through the feedback channel, the code block group identifier of the NACK feedback, 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 the 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 merge state or a non-merge state for the 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 first transport block and/or the corresponding code block group in the second transport block by identifying the code block group identifier feeding back the NACK information.

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

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

In the 10 th embodiment of the present invention, the configuration information may be sent by a network device, or sent by other sending UEs, or written by a protocol agreement.

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 the 9 th embodiment of the present invention, further includes: the transmitting terminal 2 uses the terminal device in the 10 th embodiment of the present invention.

The transmitting terminal is used for transmitting a first transmission block, and if the first transmission block is transmitted based on the code block group, starting hybrid automatic repeat request feedback information detection on 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 carrying out hybrid automatic repeat request detection on each code block group if the first transmission block is transmitted based on the 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 also used for carrying and sending the feedback information of which the detection result in the code block group is NACK on a feedback channel corresponding to the code block group identification;

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

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

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

It is to 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 invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should 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;

and according to the configuration information, carrying and sending the feedback information of which the detection result is NACK in the code block group on a feedback channel corresponding to the code block group identifier.

2. The multicast communication feedback method of claim 1, wherein the feedback information of the code block group adopts a 1-bit semi-static codebook.

3. The multicast communication feedback method according to claim 1, wherein the feedback channels corresponding to the code block groups with different code block group identifiers are distinguished by time division multiplexing or frequency division multiplexing.

4. The multicast communication feedback method according to claim 1, wherein the configuration information at least includes the following 1 information: the maximum value of the code block group, the resource configuration information of the feedback channel, the format information of the feedback channel and the MCS configuration information adopted by the feedback channel.

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

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

receiving a second transmission block of the same HARQ process as the first transmission block, and if the second transmission block is transmitted based on the 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, performing an AND operation on the detection results of the code block groups corresponding to the same code block group identifier in the first transmission block and the second transmission block, and carrying and sending the feedback information of which the result is NACK on a feedback channel corresponding to the code block group identifier.

7. The multicast communication feedback method according to any of claims 1 to 5, wherein when the configuration information indicates to receive a packet, the method further comprises:

and according to the configuration information, carrying and sending the feedback information of which the detection result is NACK in the code block group on a feedback channel corresponding to the code block group identifier and the grouping identifier.

8. The multicast communication feedback method according to any of claims 1 to 5, wherein the step of receiving the first transport block and performing hybrid automatic repeat request detection on each code block group if the first transport block is transmitted based on the code block group further comprises:

receiving a first transport block;

selecting one or more of the code block groups for hybrid automatic repeat request detection if the first transport block is transmitted based on the code block group.

9. The multicast communication feedback method according to any one of claims 1 to 5, wherein the configuration information is obtained by at least one of: higher layer signaling, physical layer signaling, or protocol writing.

10. The multicast communication feedback method of claim 4, wherein 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.

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

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

according to the configuration information, the code block group identity is identified through a feedback channel receiving NACK feedback information, and the code block group is retransmitted.

12. The multicast communication feedback method according to claim 11, wherein the feedback channels corresponding to the code block groups with different code block group identifiers are distinguished by time division multiplexing or frequency division multiplexing.

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

14. The multicast communication feedback method according to claim 11, wherein said configuration information includes at least one of: the maximum value of the code block group, the resource configuration information of the feedback channel, the format information of the feedback channel and the MCS configuration information adopted by the feedback channel.

15. The multicast communication feedback method of claim 11, wherein the configuration information further includes indication information to enable or disable code block group based transmission for the first transport block.

16. The multicast communication feedback method according to any of claims 11 to 15, wherein said method further comprises:

simultaneously sending a second transport block of the same HARQ process as the first transport block, and if the second transport block is transmitted based on the code block group, starting 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, identifying the code block group identification through a feedback channel receiving NACK feedback information according to the configuration information, and retransmitting the code block group corresponding to the code block group identification in the first transmission block and/or the second transmission block.

17. The multicast communication feedback method according to any of claims 11 to 15, wherein when the configuration information indicates to receive a packet, the method further comprises:

and identifying the code block group identification and the grouping identification through a feedback channel receiving the NACK feedback information, and retransmitting the corresponding code block group.

18. The multicast communication feedback method according to any of claims 11 to 15, wherein the step of sending the first transport block and enabling hybrid automatic repeat request feedback information detection for each code block group if the first transport block is transmitted based on the code block group further comprises:

transmitting a first transport block;

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

19. The multicast communication feedback method according to any one of claims 11 to 15, wherein the configuration information is obtained in at least one of the following manners: higher layer signaling, physical layer signaling, or protocol writing.

20. A multicast communication feedback terminal device, using the method of any one of claims 1 to 10, 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 performing hybrid automatic repeat request detection on each code block group if the first transmission block is transmitted based on the code block group;

the configuration module is used for acquiring configuration information;

the determining module is configured to determine, according to the configuration information, feedback channel information corresponding to the code block group identifier;

and the sending module is used for carrying and sending the feedback information of which the detection result is NACK in the code block group on a feedback channel corresponding to the code block group identifier.

21. The multicast communication feedback end device of claim 20,

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

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

the determining module is further configured to identify the same feedback channel information corresponding to the same code block group identifier in the first and second transport blocks;

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

22. The multicast communication feedback end device according to any of claims 20 to 21,

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

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

the sending module is further configured to carry and send feedback information, of which the detection result is NACK, in the code block group on a feedback channel corresponding to the code block group identifier and the grouping identifier.

23. The multicast communication feedback end device according to any of claims 20 to 21,

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

24. A multicast communication feedback terminal device, using the method of any one of claims 11 to 19, comprising: the device comprises a sending module, a receiving detection module, a configuration module and a determination module;

the sending module is configured to send a first transport block, and if the first transport block is transmitted based on a code block group, enable hybrid automatic repeat request feedback information detection for each code block group;

the configuration module is used for acquiring configuration information;

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

the determining module is configured to determine, according to the configuration information, feedback channel information corresponding to the code block group identity;

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

the sending module is further configured to resend the corresponding code block group according to the code block group identifier for identifying the NACK feedback information.

25. The multicast communication feedback end device of claim 24,

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

the determining module is further configured to identify the same code block group in the first and second transport blocks corresponding to the same feedback channel information;

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 feeding back the NACK information.

26. The multicast communication feedback end device according to any of claims 24 to 25,

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

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

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

27. The multicast communication feedback end device according to any of claims 24 to 25,

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.

28. A multicast communication feedback system comprising a receiving terminal and a terminal device according to any one of claims 20 to 23, and further comprising a transmitting terminal and a terminal device according to any one of claims 24 to 27.