CN115866530A - Information transmission method and device - Google Patents
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- CN115866530A CN115866530A CN202111109318.XA CN202111109318A CN115866530A CN 115866530 A CN115866530 A CN 115866530A CN 202111109318 A CN202111109318 A CN 202111109318A CN 115866530 A CN115866530 A CN 115866530A
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Abstract
The invention provides an information transmission method and device, and relates to the technical field of communication. The method is applied to a receiving node and comprises the following steps: acquiring service data of a PSSCH (physical direct link shared channel) which is sent by a sending node in a first time slot; determining a reference time slot for sending PSFCH feedback resource context information to a sending node according to a predetermined mode with the sending node; determining PSFCH feedback resources corresponding to the PSSCH according to the context information corresponding to the reference time slot; and transmitting the PSFCH information to the transmitting node on the PSFCH feedback resource, wherein the PSFCH feedback resource is in the second time slot. The scheme of the invention solves the problem that member codes in multicast are changed and resource conflict is easy to occur by ensuring that the PSFCH information sent by the receiving node and the PSFCH information received by the sending node understand the context information corresponding to the PSFCH information in the same time slot.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an information transmission method and apparatus.
Background
In the NR (New Radio, new air interface) communication mode, in addition to broadcasting in LTE (Long Term Evolution), a communication mode based on multicast and unicast is introduced, and here we only discuss a multicast scenario; for unicast and multicast communication, in addition to the blind retransmission mechanism, NR introduces feedback-based retransmission, and introduces two feedback modes: ACK (Acknowledgement)/NACK (Negative Acknowledgement) feedback and NACK only feedback; for unicast, determining to adopt ACK/NACK feedback; for broadcasting, two feedback mechanisms coexist.
For the group management process and the small number of group members (the corresponding feedback resources are not limited), the feedback in an ACK/NACK mode is adopted; for the non-group management process or the group management process and the large number of group members (the corresponding feedback resources are limited), a feedback mechanism based on NACK only is adopted; in the former way, regardless of whether ACK or NACK is determined, the PSFCH (physical direct link feedback channel) feedback information needs to be sent; for the latter mode, only determining NACK sends PSFCH feedback information; here ACK means that the terminal correctly decodes the PSSCH data information; NACK indicates that the terminal resolved the PSCCH but did not correctly decode the PSCCH data information; here we only consider feedback based on the ACK/NACK approach.
The PSFCH feedback resources in the multicast ACK/NACK feedback are related to the group member number (member ID) of the node, but the member ID is not a definite constant, namely, the member ID is changed along with the topology change of the communication group (joining the group, leaving the group, etc.). The prior art standard protocol only mentions the use of the Member ID, but the details are not discussed, i.e. the Member ID and the Member ID list are information of a higher layer, and the processing of this message is not standardized. For a certain multicast member, in the process of feeding back the PSFCH feedback resource by one Transport Block (TB), if the number ID changes, it is realized according to the existing standard, and there is a high possibility that the problems of number ID collision in the multicast, frequency domain resource collision of the PSFCH, missed detection of the transmitting end, false alarm of the transmitting end, etc. may occur.
Disclosure of Invention
The invention aims to provide an information transmission method and an information transmission device, which are used for avoiding the influence of resource conflict easily caused by the change of member codes in multicast.
In order to achieve the above object, an embodiment of the present invention provides an information transmission method applied to a receiving node, where the method includes:
acquiring service data of a PSSCH (physical direct link shared channel) which is sent by a sending node in a first time slot;
determining a reference time slot for sending PSFCH feedback resource context information to the sending node according to a predetermined mode with the sending node;
determining the PSFCH feedback resource corresponding to the PSSCH according to the context information corresponding to the reference time slot;
transmitting PSFCH information to the transmitting node on the PSFCH feedback resource, wherein the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
Optionally, the predetermined manner includes at least one of the following:
a first time slot in which the PSSCH is positioned is a reference time slot;
a second time slot in which the PSFCH feedback resource is positioned is a reference time slot;
the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot.
Optionally, the method further includes:
acquiring a second group of information lists distributed or updated by a sending node for the receiving node; or, acquiring a second group of information lists distributed or updated for the receiving node by the network side equipment;
and the receiving node allocates or updates the second group information list for the sending node or the network side equipment.
Optionally, the acquiring and sending node allocates or updates a second group of information lists to the receiving node; or, acquiring a second group of information lists allocated or updated by the network side device for the receiving node, where the method further includes:
according to the received request message of the distributed or updated second group information list, sending a first request message to the sending node or the network side equipment, and receiving a second request message sent by the sending node or the network side equipment; the first request message includes: the receiving node confirms that the receiving node receives the receiving message of the second group information list distribution or update; the second request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
Optionally, the method further includes:
after receiving the second request message sent by the sending node or the network side device, the receiving node records and maintains the current context information in the receiving node, and associates the current context information with the current time, where the current context information includes: the second set of information list.
Optionally, the receiving node allocates or updates the second group information list to the sending node or the network side device, and the method further includes:
sending a third request message to the sending node or the network side equipment; the third request message includes: determining a received request message for the allocated or updated second set of information list;
sending a fourth request message to the sending node or the network side equipment; the fourth request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
Optionally, the method further includes:
after sending the fourth request message to the sending node or the network side device, or after sending the fourth request message to the sending node or the network side device and after a preset time, the receiving node records and maintains the current context information inside the receiving node, and associates the current context information with the current time, where the current context information includes: the second set of information list.
In order to achieve the above object, an embodiment of the present invention provides an information transmission method, applied to a sending node, where the method includes:
transmitting service data corresponding to a physical straight-through link shared channel PSSCH to a receiving node at a first time slot;
determining a reference time slot for receiving a PSFCH feedback resource context sent by a physical straight-through link feedback channel to the receiving node according to a predetermined mode with the receiving node;
determining the PSFCH feedback resource of each receiving node corresponding to the PSSCH according to first context information corresponding to the reference time slot;
receiving the PSFCH information sent by each receiving node on each PSFCH feedback resource; the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
Optionally, the method further includes:
determining all PSFCH feedback resources corresponding to the PSSCH to be preprocessed according to second context information corresponding to the second time slot;
wherein the pre-processing comprises: and only processing intersection resources of the PSFCH resources corresponding to the second context information and the PSFCH resources corresponding to the first context information.
Optionally, the predetermined manner includes at least one of the following:
a first time slot in which the PSSCH is positioned is a reference time slot;
a second time slot in which the PSFCH feedback resource is positioned is a reference time slot;
the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot.
Optionally, the method further includes:
acquiring a second group of information lists distributed or updated by a sending node for the receiving node; or, acquiring a second group of information lists distributed or updated for the receiving node by the network side equipment;
and receiving the second group information list distributed or updated by the receiving node for the sending node.
Optionally, a second group of information lists allocated or updated by the sending node for the receiving node is obtained; or, acquiring a second group information list allocated or updated by the network side device for the receiving node, where the method further includes:
receiving a first request message sent by the receiving node according to the sent distributed or updated second group information list, and sending a second request message to the receiving node; the first request message includes: the receiving node confirms that the receiving node receives the receiving message of the second group information list distribution or update; the second request message includes: a confirm/response message to confirm the allocation or update the second group information list.
Optionally, the method further includes:
the sending node sends a second request message to the receiving node; alternatively, the first and second electrodes may be,
and the sending node indicates a control instruction to the network side equipment, and the control instruction is used for controlling the network side equipment to send a second request message to the receiving node.
Optionally, the receiving node allocates or updates the second group information list to the sending node, and the method further includes:
receiving a third request message sent by the receiving node to the sending node; the third request message includes: determining a request message of the allocated or updated second group information list received;
receiving a fourth request message sent by the receiving node to the sending node; the fourth request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
To achieve the above object, an embodiment of the present invention provides an information transmission apparatus applied to a receiving node, including:
a first obtaining module, configured to obtain service data of a corresponding physical direct link shared channel PSSCH that is sent by a sending node in a first time slot;
a first determining module, configured to determine, according to a predetermined manner with the sending node, a reference timeslot for sending physical straight-through link feedback channel PSFCH feedback resource context information to the sending node;
a second determining module, configured to determine, according to context information corresponding to the reference timeslot, the PSFCH feedback resource corresponding to the PSSCH;
a first sending module, configured to send PSFCH information to the sending node on the PSFCH feedback resource, where the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
To achieve the above object, an embodiment of the present invention provides an information transmission apparatus, applied to a sending node, including:
a second sending module, configured to send, to the receiving node in the first time slot, service data corresponding to a physical direct link shared channel PSSCH;
a third determining module, configured to determine, according to a predetermined manner with the receiving node, a reference timeslot for receiving, by the sending node, a resource context fed back by a physical direct link feedback channel PSFCH sent by the receiving node;
a fourth determining module, configured to determine, according to the first context information corresponding to the reference timeslot, the PSFCH feedback resource of each receiving node corresponding to the PSSCH;
a first receiving module, configured to receive, on each PSFCH feedback resource, the PSFCH information sent by each receiving node; the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
To achieve the above object, an embodiment of the present invention provides a readable storage medium on which a program or instructions are stored, the program or instructions implementing the steps in the information transmission method according to any one of the above when executed by a processor.
The technical scheme of the invention has the following beneficial effects:
in the technical scheme, the service data of the PSSCH corresponding to the physical straight-through link shared channel (PSSCH) and sent by a sending node in a first time slot is obtained; determining a reference time slot for sending PSFCH feedback resource context information to the sending node according to a predetermined mode with the sending node; determining the PSFCH feedback resource corresponding to the PSSCH according to the context information corresponding to the reference time slot; transmitting PSFCH information to the transmitting node on the PSFCH feedback resource, wherein the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast. In the technical scheme of the invention, the PSFCH feedback resources are sent to the sending node through the second time slot of the receiving node, and the PSFCH feedback resources of the receiving node are received by the second time slot of the sending node, so that the consistency of understanding of context information of the PSFCH feedback resources among the receiving and sending nodes is ensured, and the problem of resource conflict when the member ID is changed is avoided.
Drawings
Fig. 1 is a flowchart of an information transmission method applied to a receiving node according to an embodiment of the present invention;
fig. 2 is a second flowchart of an information transmission method applied to a sending node according to an embodiment of the present invention;
fig. 3 is a block diagram of an information transmission apparatus applied to a receiving node according to an embodiment of the present invention;
fig. 4 is a second block diagram of an information transmission apparatus applied to a receiving node according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic of the process, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In addition, the terms "system" and "network" are often used interchangeably herein.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
As shown in fig. 1, an information transmission method according to an embodiment of the present invention is applied to a receiving node, and the method includes:
in this step, the sending node may also carry the indication Information through SCI (Sidelink Control Information). And the receiving node decodes the SCI to acquire the indication information. Here, the SCI schedules transmission of the psch, that is, the SCI includes time and frequency domain information for receiving psch transmission, and the psch carries one Transport Block (TB).
in this embodiment, a reference timeslot is determined through step 200 according to a pre-agreed manner with the transmitting node, and the PSFCH feedback resource in the reference timeslot is determined through step 300. In particular, a data channel of N (N is a positive integer greater than 1, preferably N equals 8) carrier data resource pools may be received by the receiving node; and after the PSSCH is finished, in a set carrier wave range, a feedback resource pool is located at the earliest feedback resource which is not less than a first time parameter after the last time slot of the receiving node for receiving the data and is used for the PSFCH feedback resource. The feedback resource pool referred to herein is a set of feedback resource configurations for at least one carrier.
Here, the PSFCH feedback resource is sent to the sending node in the second time slot where the PSFCH is located; wherein the context information comprises: a first group member list (first member ID list) within the multicast. Here, the context information may further include a source code (source ID), and other provisioning information may be acquired according to an existing standard protocol, and is not limited to the above-mentioned member ID list.
In this embodiment, the PSFCH feedback resource in the reference time slot may be calculated according to a pre-agreed manner with the transmitting node, and the PSFCH feedback resource is transmitted to the transmitting node in the second time slot where the PSFCH is located, so as to ensure that the context information of the PSFCH feedback information of the transceiving node is in the same time slot, i.e., the second time slot, and also ensure the consistency maintained between the receiving nodes with respect to a group information list (Member ID list) (including itself).
It should be noted that the psch is a physical layer concept, the PSFCH is a feedback channel of the psch, and the psch can transmit information for the same transport block. It should be noted that the Member ID is a message of the two-way handshake, and the new Member ID is not valid until the update confirm message (ACK message) is not received.
It should be noted that, if the number in the multicast is not maintained consistently, for example, some members use new IDs, and some members introduce old IDs, when determining the PSFCH feedback resource, collision of resources in the group may be introduced, and it may also be possible that the service sending end has no way to obtain correct feedback information, that is, the corresponding feedback resource positions understood by the sending end and the receiving end are different; i.e. must be guaranteed to be consistent.
Scene 1: receiving conflict of group members for ID maintenance inconsistency;
original member ID: { member ID1, member ID2, member ID3, member ID4, member ID5}; vehicle "3" exit; change ID, where member ID1 is still member ID1; changing the member ID2 into member ID2; changing the member ID4 into a member ID3; the member ID5 is changed to the member ID4. Here, if the vehicle 4 is in accordance with the previous member ID, i.e., 4; the vehicle 5 will have a conflict of the member IDs according to the updated member ID, that is, 4.
Here, the receiving node of the present invention sends the PSFCH feedback resource in the second time slot, and the sending node parses the PSFCH feedback resource in the second time slot, that is, when it is determined that the sending end and the receiving end determine the context information of the PSFCH feedback resource, the understanding of the member ID list is consistent.
It should be noted that, on the premise of maintaining consistency between the number ID list (including itself) and the source ID, the time point and the processing are determined between the sending node and the receiving node; when the sending end and the receiving end need to be ensured to determine the feedback resources, the same time point needs to be ensured in terms of time, and further, the understanding of the member ID list is ensured to be consistent.
Specifically, the predetermined manner in the step 200, and the predetermined manner in the step 200, include at least one of the following:
the first method is as follows: a first time slot in which the PSSCH is positioned is a reference time slot;
the second method comprises the following steps: a second time slot in which the PSFCH feedback resource is positioned is a reference time slot;
the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot.
It should be noted that, the first time slot is smaller than or equal to the reference time slot, and the reference time slot is smaller than the second time slot, and values of the reference time slot are different in different predetermined manners.
In a specific embodiment, the first mode is that the receiving node and the transmitting node determine, according to a slot (slot) where the PSSCH where a transport block is located, the receiving node and the transmitting node to be the reference slot, that is, a first slot where the PSSCH is located is a reference slot, and calculate by determining a member ID context in the PSFCH feedback resource corresponding to this moment.
In some embodiments, the transmitting nodes may be synchronized and perform sidelink transmissions that are aligned with slot boundaries. Each sidelink transmission includes a PSCCH and a sidelink control channel (PSCCH) transmission. Each PSCCH transmission includes information about all other PSCCH resources used to transmit the same transport block, here in terms of the corresponding slot per each PSCCH transmission by the TB. For example, in one embodiment, the transmitting node and the receiving node may use discontinuous transmission over time with a channel access granularity equal to one slot (the total TX duration of one Transport Block (TB) is N slots, e.g., N =1, 2,3,4 …), where the channel access boundaries may be aligned at the slot level from a system perspective, where the pre-agreed manner is set as the slot for each PSSCH of the TB for both receiving node feedback and transmitting node receive feedback resources, ensuring consistency of context understanding by the transmitting and receiving nodes.
It should be noted that, the processing procedure of the transport block TB at each time of the physical through link shared channel pscch is an independent processing procedure.
In this embodiment, each processing procedure in the TB is independent, because of non-real-time property, and finally, a Media Access Control (MAC) layer corresponding to the TB needs to be preprocessed, so as to avoid leaving a node. Here, the preprocessing includes: the group members leave from the group member list in the multicast without feedback (DTX) processing; group members join in the multicast without processing.
In another specific embodiment, the second method includes: a second time slot in which the PSFCH feedback resource is positioned is a reference time slot; the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot. Namely, determining a second time slot in which the PSFCH feedback information corresponding to the sending node is sent; and determining a second time slot which is earlier than the PSFCH feedback information and later than the first time slot in which the PSSCH is positioned, wherein the time slot which is separated from the second time slot by a preset time slot is a reference time slot.
In this embodiment, the second timeslot in which the feedback information corresponding to the PSFCH is sent to the sending node is determined to be slot2; determining the processing time (Tproc, X) of the receiving node by the determination of the PSFCH feedback resource at the preset interval time slot; therefore, the reference time slot is slot 2-processing time (Tproc, X), and here, by determining the reference time slot, the time for determining the PSFCH feedback resource is ensured, and further, it is ensured that the PSFCH feedback resource is transmitted in a second time slot after the reference time slot, so that consistency of context understanding of the receiving node and the transmitting node for the PSFCH feedback resource is ensured, and thus, the problem of source collision caused by node addition or node departure is avoided.
It should be noted that, because of non-real-time performance, MAC layer preprocessing is also required here to avoid leaving a node.
It should be appreciated that the MAC layer defines how packets are transmitted over the medium. In links sharing the same bandwidth, access to the connection medium is "first come, first served". Physical addressing is defined herein, as is the logical topology (the path of a signal through the physical topology). Line control, error notification (uncorrected), frame delivery order, and optional flow control are also implemented at this sub-layer.
According to the method, no matter the reference time slot is determined based on a pre-appointed mode of TB transmission, or the time slot which is earlier than the second time slot where the PSFCH feedback information is located, is later than the first time slot where the PSSCH is located, and is separated from the second time slot by a preset time slot is determined as the reference time slot, further processing needs to be carried out through an MAC layer, and the condition that a node leaves in multicast is mainly considered.
The above process is explained below by means of two specific examples.
Specific example 1: there is a change in the member leaving the member ID list. I.e. the transmitting node UE1 selects resources (TX 1, TX2, TX 3) at (TX 1-3) slots ready to transmit. The transmitting node UE1 receives a high-level indication in a slot (TX 1-2) and changes a context (context); context 1: { member ID1, member ID2, member ID3} is changed to context2 (member ID1, member ID2} (there is a node leaving the fleet).
Receiving node UE2 resolves the SCI at TX1 to determine the PSFCH resource time-frequency domain location. (considering the PSFCH resource determination time and the packet packing time, the corresponding determination cannot be made at the time point corresponding to the feedback resource corresponding to TX 1); when the context information is already context2 (a node leaves the fleet); the receiving node UE2 determines the PSFCH time-frequency code resources at (TX 1+ m) slots (m depends on the UE capabilities). That is, when the receiving node UE2 determines the PSFCH resource in TX1 to (TX 1+ m) slots, it is determined according to context 2.
The technical scheme of the invention determines that the sending node analyzes the feedback resource according to the second time slot of the PSFCH feedback resource sent by the receiving node by a pre-appointed mode, namely, determines PSFCH receiving according to context2, namely, ensures that the information of the sending node and the receiving node is matched and symmetrical, namely, for the number ID3, the UE1 does not exist, the UE2 also does not exist, and the condition that the information is consistent with the actual condition is ensured.
It should be noted that, here, the specifically selected resource of the node UE1{ TX1, TX2, TX3} depends on the UE implementation; the selection of { TX1-3+3, TX1-3+4, TX1-3+5} is merely an illustration, and other resources within the resource selection window may be selected.
As shown in the above method, the context change at the higher layer is a higher layer process, and is independent of the selection process of the underlying resource, i.e. it can be considered as an arbitrary time, and here, the sending node UE1 (TX 1-2) slot receives the context change information only by way of example.
Since the first transmission of TX1 is TX1slot, i.e. the receiving node UE2 starts receiving the transmission of the transmitting node at TX1, it starts parsing the SCI. The transmitting node is adapted to determine the PSFCH resources, which is not explicitly stated in the standard. The PSSCH/PSCCH resource can be determined (corresponding to the (TX 1-3) slot) when being determined, or can be determined again at the slot where the PSSCH is located.
Specific example 2: the addition of a new member causes the change of the member ID list. I.e. the transmitting node UE1 selects the resource (TX 1, TX2, TX 3) at (TX 1-3) slot; ready for transmission. A transmitting node UE1 receives a high-level indication at a slot (TX 1-2), and the context is changed; context 1, { member ID1, member ID2, member ID3} is changed to context2, chamber ID1, member ID2, member ID3, member ID4} (there is a node joining the fleet).
Receiving node UE2 resolves the SCI at TX1 to determine the location of the PSFCH resource. (consider different PSFCH cycle N and K parameters, and the difference of processing time, and in terms of flow, consider PSFCH resource determination time and packet packing time, only SCI time is a certain time, and no corresponding determination can be made at the time point corresponding to the feedback resource corresponding to TX 1); the context information is now context2; (one node has joined the fleet). The receiving node UE2 determines the PSFCH time-frequency code resources at (TX 1+ m) slots (m depends on the UE capabilities). That is, when the receiving node UE2 determines the PSFCH resource in TX1 to (TX 1+ m) slots, it is determined according to context 2.
The technical scheme of the invention analyzes the PSFCH feedback information according to the second time slot fed back by the receiving node by determining the sending node, namely for the sending node UE1, if the PSFCH receiving is determined according to context2, the PSFCH receiving is matched and symmetrical with the information of the receiving node, namely for the memberID4, the UE1 is considered to exist, and the UE2 is considered to exist, namely the feedback of the UE1 to the memberID4 is consistent with the actual situation.
It should be noted that only handshake ACKs (multiple retransmissions) are included to ensure that it is understood that the point in time for the validation is substantially consistent. Only if the understanding is consistent, the higher/application layer can inform the lower layer about this as a context. Similar to the handshake flow, only when receiving ACK information, the application layer of the node changes the information related to the ID, and it is ensured as much as possible that maintenance of the member ID by all group members is synchronous and has no time difference.
Optionally, the method further includes:
step 11, the receiving node allocates or updates the second group information list to the sending node or the network side device.
It should be noted that, the first group information list is a number allocated or updated by the sending node or the network side device to the receiving node in the multicast setup communication process, and may also be referred to as an update number.
In this embodiment, the second group information list may be represented as list information to be updated, and although the receiving node determines to receive the second group information list, the second group information list is not updated immediately, and here, it is required to ensure that the second group information list can be used as updated information only after a handshake between the sending node and the receiving node is successfully received. Since the receiving node may receive the allocated or updated second group information list sent by the sending node or the network side device, and may send the allocated or updated second group information list to the sending node or the network side device, the two steps 10 and 11 may occur. Here, at the time of step 11, the receiving node may be considered to be a head node; the network side device may represent other nodes in the multicast, which are not the receiving node, or a network side entity.
The process of allocating or updating the second group information list for the receiving node when the sending node or the network side device is other nodes in the multicast but not the receiving node is as follows:
the multicast establishing process may be regarded as establishing a plurality of connections between each receiving node and the sending node, and the sending node establishes a second group information list for the joined node allocation group in the connection establishing process. The sending node maintains some information for the entire group including the group size and information for each group member (group setup group number, capabilities, etc.).
When a node is added, in the connection establishment process, a sending node allocates a new identifier (also called an intra-group ID) for the newly added node according to the maintained information, and unlike the cellular network C-RNTI, the intra-group ID of the receiving node in the same group ensures the continuity as much as possible, namely the maximum intra-group ID number is consistent with the group size.
When the sending node allocates the ID in the group to the receiving node, the sending node may perform Sidelink RRC signaling. The RRC signaling is encrypted so that it is not known to third parties, protecting privacy.
When the network side device is a network side entity, the process of establishing the second group information list for the receiving node distribution group is as follows:
the whole multicast group establishment and group maintenance process is network management or group head/cluster head management. It should be noted that, the multicast establishment process may be regarded as multiple connections between each receiving node and the sending node, and the connections are established to form a group, where the group includes one sending node (also referred to as a cluster head or a group head) and at least two receiving nodes (also referred to as cluster members or group members).
When a node needs to join a group, the network assigns it an initial intra-group ID during the grouping process. The allocation here may be a network NAS layer (non access stratum) allocation.
Two scenarios are generally included with respect to a group:
scene one: completely static groups, such as operating fleets. For scenario one, the group setup group number of the receiving node does not need to be changed, and once initially allocated, it will not be changed.
Scene two: semi-static groups, allowing joining groups and leaving groups. For the scene two, if a node is added, only the newly accessed node is allocated with the initial ID, and the IDs of other nodes are not influenced; when a node leaves, the ID of other nodes can be influenced; it is necessary to ensure that the ID of the receiving node is continuously up-to-date (optional) by means of higher layer information, such as a reconfiguration message.
For example, when a node leaves, the sending node determines the set of affected receiving nodes according to the maintained information; the affected respective receiving nodes are reassigned the intra-group ID and the intra-group ID can be updated through SL RRC signaling. The RRC signaling is encrypted so that it is not known to third parties, protecting privacy. When the sending node sends the 'update ID signaling', the sending node considers the update to be effective after receiving the L1/R2/R3 confirmation message of the receiving node at the opposite end.
Specifically, after step 10, the method further comprises:
It should be noted that, through steps 200 to 300, context information corresponding to the reference time slot may be acquired, and according to the acquired context information, a first group information list corresponding to the reference time slot may be determined, and a group member number of the first group information list is determined by imprinting, where the first group information list is an initially assigned group information list.
That is, in step 20, the receiving node receives the second group information list (the established or updated group information list), and needs to send a corresponding information receiving message, that is, a first request message, to the sending node, so as to satisfy the requirement that the receiving node receives the first interaction of the second group information list; after the first request message is sent, a second request message sent by the sending node is received, namely, a confirmation/response message for determining to distribute or update the second group information list is received, the second interaction is met, and the reliability of the updating process is ensured according to multiple times of interactive authentication.
Specifically, the method further comprises:
step 21, after receiving the second request message sent by the sending node or the network side device, the receiving node records and maintains the current context information inside the receiving node, and associates the current context information with the current time, where the current context information includes: the second set of information list.
It should be noted that, here, not only the second group information list is used for updating, but also the inside of the second group information list is recorded and maintained with context information, here, the purpose of data traceability and timely updating is achieved, and the second group information list is only used for updating the first group information list, so that the coverage degree can be achieved. For example, the first information list is {1,2,3,4}, the second information list is {1,3,5}, and it can be known in the second information list that the nodes with the group IDs of "2" and "4" leave and the group number "5" is newly added, where the first information list is updated according to the content of the second information list, and specifically, after the update, the first information list may be sorted by the second information list to become a new {1,2,3}, where "2" in the new list corresponds to "3" in the first information list and "3" in the new list corresponds to "5" in the new list.
Specifically, after step 11, the method further includes:
sending a third request message to the sending node or the network side equipment; the third request message includes: determining a received request message for the allocated or updated second set of information list;
sending a fourth request message to the sending node or the network side equipment; the fourth request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
In this embodiment, the receiving node needs to send a third request message to the sending node or the network side device, that is, to determine to receive a confirmation update message for updating the first group information list according to the second group information list, and send a fourth request message to the sending node or the network side device, so that handshake interaction between the sending node and the receiving node can be satisfied, and thus the receiving node updates the context information of the first group information list.
It should be noted that, the second group information list is a number determined by the receiving node for feeding back the PSFCH feedback resource usage in the second time slot, and in order to reduce resource waste, in this embodiment of the present invention, the second group information list is a relative number of the receiving node in one group, which may also be referred to as a number of the receiving node in one group relative to an effective node.
If the current ID is 11 at maximum, in practice there are 8 members in the group, i.e. 8 valid IDs. Such as the {2,5, 10} node has left; {1,3,4,6,7,8,9, 11} is also within the group;
the sending node may employ the following indication: maximum group size (ID max) + group valid bitmap (bitmap) indication; wherein, the bitmap is 10110111101; the receiving node receiving the indication can acquire the group establishment group number of the effective receiving nodes in the group and the number of the effective receiving nodes in the group, so that the group member number of the receiving node in the group can be confirmed.
Specifically, the method further comprises:
step 32, after sending the fourth request message to the sending node or the network side device, or after sending the fourth request message to the sending node or the network side device and after a preset time elapses, the receiving node records and maintains the current context information inside the receiving node, and associates the current context information with the current time, where the current context information includes: the second set of information list.
For example, for cluster 1, node a is the cluster head (i.e., the sending node); after the node B joins, the cluster head or the higher layer assigns an intra-group ID to the node B in the connection establishment process of 6. Based on the current indication of the sending node, node B may consider its relative intra-group ID to be 4, since both ID2 and ID5 have left the group. Through the above process of determining handshake interaction between the receiving node and the sending node, each receiving node in the group can know its own relative group member number and the size of the valid receiving node in the group.
It should be noted that, at present, there is no standardized process for the group information list, i.e., it is only necessary to send the group information list once, so that some members receive the group information list and update the group information list directly; some members do not receive the message and do not update the message, so that the group information list of the transceiving nodes is not aligned. Through the above-mentioned interactive process, i.e. each time, handshake is guaranteed, it is at least guaranteed that all nodes receive, and the sending node sends the past receiving node again to update the group information list; however, the updated node is not necessarily the sending node, i.e. the node on the updated group information list is the cluster head or the group head, and the sending node is the node sending the traffic data.
The technical scheme of the invention not only ensures the flow that the group internal interaction is updated successfully when the PSFCH feedback resource is sent in the second time slot, but also carries out further authentication on the updating of the second time slot, thereby improving the reliability of communication data interaction.
As shown in fig. 2, an embodiment of the present invention further provides an information transmission method, which is applied to a sending node, and the method includes:
it should be noted that, if the sending node further needs to send service data to a certain address, the service data respectively belong to one or more physical channels, each physical channel has its corresponding physical channel priority, and the highest priority among the physical channels may be selected as the priority corresponding to the address.
In this embodiment, the transmitting node receives the PSFCH feedback resources sent by each receiving node of the second time slot, and decodes the PSFCH feedback resources, so as to ensure context understanding consistency of the PSFCH feedback resources of the second time slot between the transmitting node and the receiving node.
Optionally, the method further includes:
determining all PSFCH feedback resources corresponding to the PSSCH to be preprocessed according to second context information corresponding to the second time slot;
wherein the pre-processing comprises: and only processing intersection resources of the PSFCH resources corresponding to the second context information and the PSFCH resources corresponding to the first context information.
It should be noted that, assuming that the PSFCH resource corresponding to the first context information is {1,2,3,4}, and the PSFCH resource corresponding to the second context information is {1,3,5}, here, only processing is performed on intersection resources, that is, only processing is performed on {1,3} resources, some of {2,4,5} resources are leaving resources, and some are newly joining resources, here, there is a group member leaving in the group member list in multicast, and no feedback (DTX) processing is performed; group members join in the multicast without processing.
Optionally, the predetermined manner includes at least one of the following:
a first time slot in which the PSSCH is positioned is a reference time slot;
a second time slot in which the PSFCH feedback resource is positioned is a reference time slot;
the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot.
In this embodiment, the predetermined manner is a processing manner corresponding to the receiving node, and it should be understood that the corresponding method that can be processed at the receiving node can implement corresponding functions at one end of its sending node, that is, the opposite end, which is not described herein too much.
Specifically, the method further comprises:
step 41, receiving the second group information list allocated or updated by the receiving node for the sending node.
In this embodiment, when the sending node sends the second group information list to its receiving node, the sending node is its cluster head or group head, and when the sending node receives the second group information list sent by the receiving node, it is understood that the receiving node is its cluster head or group head, and in different implementation manners, the determination may be made according to a specific implementation scenario.
Optionally, after step 40, the method further comprises:
Specifically, the method further comprises:
step 51, the sending node sends a second request message to the receiving node; alternatively, the first and second electrodes may be,
and the sending node indicates a control instruction to the network side equipment, and the control instruction is used for controlling the network side equipment to send a second request message to the receiving node.
Specifically, after step 41, the method further includes:
receiving a fourth request message sent by the receiving node to the sending node; the fourth request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
It should be noted that, according to the specific interaction situation, the sending node and the receiving node correspond to the steps in step 40 to step 60, it should be noted that the update Member ID in the context message between the first time slot and the second time slot is a message of the secondary handshake, and the new Member ID is not valid until the update confirmation message (ACK message) is not received.
Specifically, only through the handshake ACK between the step 40 to the step 60 and the receiving node, it can be ensured that the context information of the transceiving node for the PSFCH feedback resource in the second time slot is understood consistently. Optionally, similar to the handshake process, only when receiving the ACK information, the application layer of the node changes the information related to the ID, so as to ensure that maintenance of the member ID by all group members is synchronous and has no time difference.
In summary, the technical solution of the present invention avoids the problems of ID collision, resource collision, false alarm and missing report of a sending node, etc. caused by the change of the member ID list or the deviation of the receiving timing sequence by ensuring the consistency of the receiving node sending the PSFCH feedback resource and the sending node receiving the PSFCH feedback node in understanding the context information of the PSFCH feedback information.
As shown in fig. 3, an embodiment of the present invention further provides an information transmission apparatus, applied to a receiving node, where the apparatus includes:
a first obtaining module 10, configured to obtain service data of a corresponding physical direct link shared channel PSSCH that is sent by a sending node in a first time slot;
a first determining module 20, configured to determine, according to a predetermined manner with the sending node, a reference timeslot for sending a physical straight-through link feedback channel PSFCH feedback resource context information to the sending node;
a second determining module 30, configured to determine, according to the context information corresponding to the reference timeslot, the PSFCH feedback resource corresponding to the PSSCH;
a first sending module 40, configured to send PSFCH information to the sending node on the PSFCH feedback resource, where the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
It should be noted that the predetermined manner includes at least one of the following:
a first time slot in which the PSSCH is positioned is a reference time slot;
a second time slot in which the PSFCH feedback resource is positioned is a reference time slot;
the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot.
Optionally, the apparatus further comprises:
a second obtaining module, configured to obtain a second group information list that is allocated or updated by a sending node for a receiving node; or acquiring a second group information list distributed or updated by the network side equipment for the receiving node;
a first processing module, configured to allocate or update the second group information list to the sending node or the network side device by the receiving node.
Optionally, the apparatus further comprises:
a second processing module, configured to send a first request message to the sending node or the network side device according to the received request message of the distributed or updated second group information list, and receive a second request message sent by the sending node or the network side device; the first request message includes: the receiving node confirms that the receiving node receives the receiving message of the second group information list distribution or update; the second request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
Optionally, the apparatus further comprises:
a third processing module, configured to, after receiving a second request message sent by the sending node or the network side device, record and maintain current context information in the receiving node, and associate the current context information with a current time, where the current context information includes: the second set of information list.
Optionally, the apparatus further comprises:
a fourth processing module, configured to send a third request message to the sending node or the network side device; the third request message includes: determining a received request message for the allocated or updated second set of information list;
a fifth processing module, configured to send a fourth request message to the sending node or the network side device; the fourth request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
Optionally, the apparatus further comprises:
a sixth processing module, configured to, after sending the fourth request message to the sending node or the network-side device, or after sending the fourth request message to the sending node or the network-side device and a preset time elapses, record and maintain, by the receiving node, current context information inside the receiving node, and associate the current context information with a current time, where the current context information includes: the second set of information list.
As shown in fig. 4, an embodiment of the present invention further provides an information transmission apparatus, which is applied to a sending node, where the apparatus includes:
a second sending module 50, configured to send, to the receiving node in the first time slot, service data of a corresponding physical direct link shared channel PSSCH;
a third determining module 60, configured to determine, according to a predetermined manner with the receiving node, a reference timeslot for receiving, by the sending node, a resource context fed back by a physical direct link feedback channel PSFCH sent by the receiving node;
a fourth determining module 70, configured to determine, according to the first context information corresponding to the reference timeslot, the PSFCH feedback resource of each receiving node corresponding to the PSSCH;
a first receiving module 80, configured to receive, on each PSFCH feedback resource, the PSFCH information sent by each receiving node; the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
Optionally, the apparatus further comprises:
a fifth determining module, configured to determine, according to second context information corresponding to the second time slot, all PSFCH feedback resources corresponding to the PSSCH for preprocessing;
wherein the pre-processing comprises: and only processing intersection resources of the PSFCH resources corresponding to the second context information and the PSFCH resources corresponding to the first context information.
It should be noted that, the predetermined manner includes at least one of the following:
a first time slot in which the PSSCH is positioned is a reference time slot;
a second time slot in which the PSFCH feedback resource is positioned is a reference time slot;
the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot.
Optionally, the apparatus further comprises:
a third obtaining module, configured to obtain a second group information list that is allocated or updated by a sending node for a receiving node; or, acquiring a second group of information lists distributed or updated for the receiving node by the network side equipment;
and the second receiving module is used for receiving the second group information list distributed or updated by the receiving node for the sending node.
Optionally, the apparatus further comprises:
a seventh processing module, configured to receive, according to the sent distributed or updated second group information list, a first request message sent by the receiving node, and send a second request message to the receiving node; the first request message includes: the receiving node confirms that the receiving node receives the receiving message of the second group information list distribution or update; the second request message includes: a confirm/response message to confirm the allocation or update the second group information list.
Optionally, the apparatus further comprises:
a third sending module, configured to send, by the sending node, a second request message to the receiving node; alternatively, the first and second electrodes may be,
and the sending node indicates a control instruction to the network side equipment, and the control instruction is used for controlling the network side equipment to send a second request message to the receiving node.
Optionally, the apparatus further comprises:
a third receiving module, configured to receive a third request message sent by the receiving node to the sending node; the third request message includes: determining a received request message for the allocated or updated second set of information list;
a fourth receiving module, configured to receive a fourth request message sent by the receiving node to the sending node; the fourth request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
The readable storage medium of the embodiment of the present invention stores a program or an instruction thereon, and the program or the instruction when executed by the processor implements the steps in the information transmission method described above, and can achieve the same technical effects, and the details are not repeated here to avoid repetition.
The processor is the processor in the information transmission method in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
In embodiments of the present invention, modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.
Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.
When a module can be implemented by software, considering the level of hardware technology, a module implemented in software may build a corresponding hardware circuit to implement corresponding functions, without considering the cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.
The exemplary embodiments described above are described with reference to the drawings, and many different forms and embodiments of the invention may be made without departing from the spirit and teaching of the invention, therefore, the invention is not to be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of elements may be exaggerated for clarity. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Unless otherwise indicated, a range of values, when stated, includes the upper and lower limits of the range and any subranges therebetween.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (17)
1. An information transmission method applied to a receiving node, the method comprising:
acquiring service data of a PSSCH (physical direct link shared channel) which is sent by a sending node in a first time slot;
determining a reference time slot for sending PSFCH feedback resource context information to the sending node according to a predetermined mode with the sending node;
determining the PSFCH feedback resource corresponding to the PSSCH according to the context information corresponding to the reference time slot;
transmitting PSFCH information to the transmitting node on the PSFCH feedback resource, wherein the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
2. The method of claim 1, wherein the pre-agreed upon manner comprises at least one of:
a first time slot in which the PSSCH is positioned is a reference time slot;
a second time slot in which the PSFCH feedback resource is positioned is a reference time slot;
the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot.
3. The method of claim 1, further comprising:
acquiring a second group of information lists distributed or updated by a sending node for the receiving node; or, acquiring a second group of information lists distributed or updated for the receiving node by the network side equipment;
and the receiving node allocates or updates the second group information list for the sending node or the network side equipment.
4. The method according to claim 3, wherein the obtaining sending node allocates or updates a second set of information list to the receiving node; or after acquiring the second group information list allocated or updated by the network side device for the receiving node, the method further includes:
according to the received request message of the distributed or updated second group information list, sending a first request message to the sending node or the network side equipment, and receiving a second request message sent by the sending node or the network side equipment; the first request message includes: the receiving node confirms that the receiving message of the second group information list distribution or update is received; the second request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
5. The method of claim 4, further comprising:
after receiving the second request message sent by the sending node or the network side device, the receiving node records and maintains the current context information in the receiving node, and associates the current context information with the current time, where the current context information includes: the second set of information list.
6. The method according to claim 3, wherein after the receiving node allocates or updates the second group information list to the sending node or the network side device, the method further comprises:
sending a third request message to the sending node or the network side equipment; the third request message includes: determining a received request message for the allocated or updated second set of information list;
sending a fourth request message to the sending node or the network side equipment; the fourth request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
7. The method of claim 6, further comprising:
after sending the fourth request message to the sending node or the network side device, or after sending the fourth request message to the sending node or the network side device and after a preset time, the receiving node records and maintains the current context information inside the receiving node, and associates the current context information with the current time, where the current context information includes: the second set of information list.
8. An information transmission method applied to a sending node, the method comprising:
transmitting service data corresponding to a physical straight-through link shared channel PSSCH to a receiving node at a first time slot;
determining a reference time slot for receiving a PSFCH feedback resource context sent by a physical straight-through link feedback channel to the receiving node according to a predetermined mode with the receiving node;
determining the PSFCH feedback resource of each receiving node corresponding to the PSSCH according to first context information corresponding to the reference time slot;
receiving the PSFCH information sent by each receiving node on each PSFCH feedback resource; the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
9. The method of claim 8, further comprising:
determining all PSFCH feedback resources corresponding to the PSSCH to be preprocessed according to second context information corresponding to the second time slot;
wherein the pre-processing comprises: and only processing intersection resources of the PSFCH resources corresponding to the second context information and the PSFCH resources corresponding to the first context information.
10. The method of claim 8, wherein the pre-agreed upon mode comprises at least one of:
a first time slot in which the PSSCH is positioned is a reference time slot;
a second time slot in which the PSFCH feedback resource is positioned is a reference time slot;
the reference time slot is positioned between the first time slot and the second time slot and is separated from the first time slot or the second time slot by a preset time slot.
11. The method of claim 8, further comprising:
acquiring a second group of information lists distributed or updated by a sending node for the receiving node; or, acquiring a second group of information lists distributed or updated for the receiving node by the network side equipment;
and the sending node receives the second group information list distributed or updated by the receiving node for the sending node.
12. The method according to claim 11, wherein a second set of information list allocated or updated by a sending node for the receiving node is obtained; or after acquiring the second group information list allocated or updated by the network side device for the receiving node, the method further includes:
receiving a first request message sent by the receiving node according to the sent distributed or updated second group information list, and sending a second request message to the receiving node; the first request message includes: the receiving node confirms that the receiving node receives the receiving message of the second group information list distribution or update; the second request message includes: a confirm/response message to confirm the allocation or update the second group information list.
13. The method of claim 12, further comprising:
the sending node sends a second request message to the receiving node; alternatively, the first and second electrodes may be,
and the sending node indicates a control instruction to the network side equipment, and the control instruction is used for controlling the network side equipment to send a second request message to the receiving node.
14. The method of claim 11, wherein after receiving the second set of information list allocated or updated by the receiving node for the sending node, the method further comprises:
receiving a third request message sent by the receiving node to the sending node; the third request message includes: determining a received request message for the allocated or updated second set of information list;
receiving a fourth request message sent by the receiving node to the sending node; the fourth request message includes: an acknowledgement/response message to assign or update the second set of information lists is determined.
15. An information transmission apparatus applied to a receiving node, comprising:
the first acquisition module is used for acquiring service data of a PSSCH (physical direct link shared channel) which is sent by a sending node in a first time slot;
a first determining module, configured to determine, according to a predetermined manner with the sending node, a reference timeslot for sending physical straight-through link feedback channel PSFCH feedback resource context information to the sending node;
a second determining module, configured to determine, according to context information corresponding to the reference timeslot, the PSFCH feedback resource corresponding to the PSSCH;
a first sending module, configured to send PSFCH information to the sending node on the PSFCH feedback resource, where the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
16. An information transmission apparatus applied to a sending node, comprising:
a second sending module, configured to send, to the receiving node in the first time slot, service data corresponding to a physical direct link shared channel PSSCH;
a third determining module, configured to determine, according to a predetermined manner with the receiving node, a reference timeslot for receiving, by the sending node, a resource context fed back by a physical direct link feedback channel PSFCH sent by the receiving node;
a fourth determining module, configured to determine, according to the first context information corresponding to the reference timeslot, the PSFCH feedback resource of each receiving node corresponding to the PSSCH;
a first receiving module, configured to receive, on each PSFCH feedback resource, the PSFCH information sent by each receiving node; the PSFCH feedback resource is in a second time slot; wherein the context information comprises: a list of group member first group information within a multicast.
17. A readable storage medium on which a program or instructions are stored, the program or instructions, when executed by a processor, implementing the steps in the information transmission method according to any one of claims 1 to 7; alternatively, the program or instructions, when executed by a processor, implement the steps in the information transmission method of any one of claims 9 to 14.
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