CN113853030A

CN113853030A - Method and equipment used for wireless communication

Info

Publication number: CN113853030A
Application number: CN202010598759.XA
Authority: CN
Inventors: 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-12-28

Abstract

A method and apparatus used for wireless communication, receiving a first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least part of bits of a first link layer identity and at least part of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity; when the target link layer identity belongs to a first identity set, a first transmitter transmits a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity; the method and the device reasonably determine the identity of the target link layer, improve the reliability and avoid the risk in communication.

Description

Method and equipment used for wireless communication

Technical Field

The present application relates to a transmission method and apparatus in a wireless communication system, and more particularly, to a transmission method and apparatus for improving system efficiency, optimizing resource utilization, reducing service interruption, improving service continuity, enhancing reliability, and better security and privacy protection in wireless communication.

Background

In the future, the application scenes of the wireless communication system are more and more diversified, and different application scenes put different performance requirements on the system. In order to meet different performance requirements of various application scenarios, research on New air interface technology (NR) or Fifth Generation (5G) is decided on 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) #72 conferences, and Work on NR is started on 3GPP RAN #75 conferences where WI (Work Item) of NR passes.

In communication, both LTE (Long Term Evolution) and 5G NR relate to accurate reception of reliable information, optimized energy efficiency ratio, determination of information validity, flexible resource allocation, a telescopic system structure, high-efficiency non-access stratum information processing, lower service interruption and disconnection rate, higher safety and privacy, for low power consumption support, which is for normal communication of base stations and user equipments, for reasonable scheduling of resources, the method has important significance for balancing system load, can be said to be high throughput rate, meets Communication requirements of various services, improves spectrum utilization rate, and improves the quality of service, and is essential for eMBBs (enhanced Mobile BroadBand), URLLC (Ultra Reliable Low Latency Communication) or eMTCs (enhanced Machine Type Communication). Meanwhile, in the Internet of Things in the Industrial field of IIoT (Industrial Internet of Things), in V2X (Vehicular to X), Device to Device communication (Device to Device), in unlicensed spectrum communication, in user communication quality monitoring, in Network planning optimization, in NTN (Non terrestrial Network, Non-terrestrial Network communication), in TN (terrestrial Network communication), in a Dual connectivity (Dual connectivity) system, in radio resource management and codebook selection for multiple antennas, in the primary link communication or the secondary link communication, in the near field security communication, in the signaling design, the neighborhood management, the service management, there are wide requirements in beamforming, the information transmission modes are divided into broadcast and unicast, and both transmission modes are indispensable for 5G systems, because they are very helpful to meet the above requirements.

With the continuous increase of the scenes and the complexity of the system, higher requirements are put forward on the reduction of the interruption rate, the reduction of the time delay, the enhancement of the reliability, the enhancement of the stability of the system, the flexibility of the service and the saving of the power, and meanwhile, the compatibility between different versions of different systems needs to be considered when the system is designed.

Disclosure of Invention

In various communication scenarios, UE-to-UE communication scenarios involve reliable link establishment and maintenance, address management configuration, coordination between different layers, and thus create a series of problems. Since in UE-to-UE communication, especially out of coverage of the serving cell, due to lack of management of one central node, coordination between different nodes is more important when relays are needed between the nodes. When a unicast communication relay is used as a relay node, one or more unicast links exist between the node and other nodes, the node forwarded by the relay node may have a plurality of nodes, and different nodes may also have communication requirements with the relay node. Generally, when different links appear simultaneously, the relationship between the links needs to be processed, and the links may be physical layer links, link layer links or layer three links. In the process of establishing a link, as a relay node needs to know the corresponding relationship between a communication service and the link, sometimes it is also necessary to multiplex multiple links together, for example, multiplexing on a unicast link or multiplexing on a link of a link layer, L2, where such multiplexing may be different bearers, different channels, and so on. Different control means, different multiplexing modes, and even multiplexing or not, can greatly affect the communication efficiency between the UE and the UE, the service delay, the service interruption, and other quality aspects. Meanwhile, the solution also needs to consider privacy. And the anti-monitoring and anti-tracking are supported. The parameters of the UE, including the identity information of the UE, the parameters related to the security algorithm of the UE, are updated, for example, periodically or at certain intervals. When updating these parameters, a listener may infer updated information from previous information if mishandled, thereby increasing the likelihood that the user will receive a security threat. For example, a listener who performs brute force to break the encryption key needs to track for a certain time and perform a large amount of calculation, the longer the tracking time is, the more likely the tracking time is to break, if the listener can infer or associate new information from old information, it is equivalent to that the UE does not perform effective update to some extent, and thus after a period of time, the security threat suffered by the user increases sharply. For communications between UEs with relays, the problem is more serious, because if the identities associated with each link cannot be the same, a listener associates an un-updated identity with an updated identity, so as to grasp a new identity, and the coordination among multiple nodes makes the problem more complicated. The presence of associations between different links can also pose a security threat. Therefore, a solution is needed that is not only beneficial to ensuring security and privacy, but also can solve the integration of the establishment management aspects of various links.

In view of the above, the present application provides a solution.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in any node of the present application may be applied to any other node. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

The application discloses a method in a first node used for wireless communication, comprising:

receiving a first MAC PDU, the first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least a portion of bits of a first link layer identity and at least a portion of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity;

when the target link layer identity belongs to a first identity set, sending a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity;

when the target link layer identity is a second link layer identity, abandoning to send the MAC PDU comprising at least part of bits in the first MAC SDU;

wherein the first set of identities comprises at least one link layer identity.

As an embodiment, the problem to be solved by the present application includes: when communication is carried out between UE, especially to sidelink communication, the identity of users needs to be updated from time to ensure the security, the updating of the identity of users can happen at any time, and the updating of the identity and the sending of data are independent; the identity update between each link is also independent. When the relay is used, the condition that a listener associates new and old identities by utilizing natural association between two links before and after the relay needs to be avoided; on the other hand, when the association is avoided, the interruption of communication needs to be avoided as much as possible; delay is reduced as much as possible; meanwhile, how the relay node handles different links is also a fundamental problem. The present application solves the above-described problems by implicitly indicating a target link layer identity using a first MAC sub-PDU.

As an example, the benefits of the above method include: two links connected by the relay node form a complete link, and the two links use different management methods during establishment and management, so that privacy and management complexity can be considered; on one hand, data of different purposes between the source node and the relay node can be multiplexed together, and meanwhile, the implicit identity relationship can be used for distinguishing, so that the time delay of the data is favorably reduced, and unnecessary interruption and data loss are reduced; on the other hand, the target link identity is used between the relay node and the target node, so that the independence between links is facilitated, and the privacy is improved.

As an example, the peculiarities of the present application include: the MAC is Medium Access Control (MAC).

As an example, the peculiarities of the present application include: the SDU is a Service Data Unit (Service Data Unit).

As an example, the peculiarities of the present application include: the PDU is a Protocol Data Unit (Protocol Data Unit).

Specifically, according to an aspect of the present application, the method includes receiving a first signaling, where the first signaling includes configuration information of the first MAC PDU; transmitting a second signaling when the second MAC PDU is transmitted;

wherein the first signaling and the first MAC header together indicate the first link layer identity and the second link layer identity; the second signaling and the second MAC header together indicate the target link layer identity.

Specifically, according to one aspect of the present application, the method includes receiving a third signaling, where the third signaling indicates a mapping relationship from a first domain to a link layer identity; wherein the target link layer identity is determined by the first domain in the first MAC sub-PDU according to a mapping relationship of the first domain to link layer identity.

Specifically, according to an aspect of the present application, the logical channel identity indicated by the first MAC sub-PDU implicitly indicates the target link layer identity.

Specifically, according to an aspect of the present application, the sequence number of the upper layer PDU indicated by the first MAC SDU implicitly indicates the target link layer identity.

Specifically, according to an aspect of the present application, the sequence number of the upper layer SDU indicated by the first MAC SDU implicitly indicates the target link layer identity.

Specifically, according to an aspect of the present application, the second MAC header includes at least a portion of bits of a third link layer identity, and the first MAC sub-PDU implicitly indicates the third link layer identity; the third link layer identity is different from the target link layer identity.

Specifically, according to an aspect of the present application, the first MAC PDU includes a second MAC sub-PDU, and the second MAC sub-PDU implicitly indicates a second target link layer identity; the second target link layer identity is an identity other than the target link layer identity; only one of the target link layer identity and the second target link layer identity belongs to the first set of identities.

Specifically, according to an aspect of the present application, the first node is a user equipment.

Specifically, according to an aspect of the present application, the first node is an internet of things terminal.

Specifically, according to an aspect of the present application, the first node is a relay.

Specifically, according to an aspect of the present application, the first node is a vehicle-mounted terminal.

In particular, according to one aspect of the application, the first node is an aircraft.

The application discloses a method in a second node used for wireless communication, comprising:

transmitting a first MAC PDU, the first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least a portion of bits of a first link layer identity and at least a portion of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity;

when the target link layer identity belongs to a first identity set, a receiver of the first MAC PDU sends a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity;

when the target link layer identity is a second link layer identity, a receiver of the first MAC PDU abandons sending the MAC PDU comprising at least part of bits in the first MAC SDU;

wherein the first set of identities comprises at least one link layer identity.

Specifically, according to an aspect of the present application, the method includes sending a first signaling, where the first signaling includes configuration information of the first MAC PDU; when the second MAC PDU is transmitted, second signaling is transmitted;

Specifically, according to an aspect of the present application, the method includes sending a third signaling, where the third signaling indicates a mapping relationship from a first domain to a link layer identity; wherein the target link layer identity is determined by the first domain in the first MAC sub-PDU according to a mapping relationship of the first domain to link layer identity.

The application discloses a first node used for wireless communication, comprising:

a first receiver to receive a first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least part of bits of a first link layer identity and at least part of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity;

when the target link layer identity belongs to a first identity set, a first transmitter transmits a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity;

when the target link layer identity is a second link layer identity, the first transmitter abandons sending the MAC PDU including at least part of bits in the first MAC SDU;

wherein the first set of identities comprises at least one link layer identity.

The application discloses a second node used for wireless communication, comprising:

a second transmitter to transmit a first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least part of bits of a first link layer identity and at least part of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity;

wherein the first set of identities comprises at least one link layer identity.

As an example, compared with the conventional scheme, the method has the following advantages:

according to the method provided by the application, in the process of updating the user identity, the user needs to avoid any behavior which is beneficial for a listener to associate new and old user identities so as to continuously track the user, and thus, the security threat can be caused. In the conventional method, a relay node uses one identity, and when the identities of two ends of a relay link, i.e. a link connecting a source node and a destination node, are updated, a listener may associate new identities with old identities, for example, when the identity of a link on one side is updated and the identity of the link on the other side is not updated; if the links on two sides need to be updated simultaneously, the management complexity can be brought, and a synchronous updating mechanism needs to be designed; if one side waits for the other side, it causes an interruption of the communication. In the method provided by the application, the relay node generates the second identity aiming at the link at one side, so that the links at the two sides can be independently separated, and the security risk is reduced. On the other hand, if both sides use different identities, especially different bearers or connections use different identities, the relay node may need to manage too many identities, and also needs to monitor many identities, which is not conducive to power saving, and may also cause problems such as false alarm. In addition, the services cannot be multiplexed together, thereby causing a series of performance degradation problems such as more time delay. According to the method, the target link layer identity is implicitly indicated through the first MAC sub-PDU, so that the relay only needs a small number of identities, even only needs one identity to distinguish different services from the source node, multiplexing among the services is supported, the method has great benefits for improving performance, and the method has the highest efficiency under the condition of meeting privacy requirements.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof with reference to the accompanying drawings in which:

FIG. 1 shows a flow diagram of receiving a first MAC PDU and transmitting a second MAC PDU according to one embodiment of the application;

FIG. 2 shows a schematic diagram of a network architecture according to an embodiment of the present application;

figure 3 shows a schematic diagram of an embodiment of a radio protocol architecture for the user plane and the control plane according to an embodiment of the present application;

FIG. 4 shows a schematic diagram of a first node, a second node and a third node according to an embodiment of the application;

FIG. 5 shows a flow diagram of a transmission according to an embodiment of the present application;

FIG. 6 shows a flow diagram of a transmission according to an embodiment of the present application;

FIG. 7 shows a diagram of a MAC PDU in accordance with one embodiment of the present application;

FIG. 8 shows a schematic diagram of node A communicating with node C according to one embodiment of the present application;

FIG. 9 illustrates a schematic diagram of a first set of parameters generating a second identity, according to an embodiment of the present application;

figure 10 shows a schematic diagram of a first signaling indicating a first link identity according to one embodiment of the present application;

figure 11 shows a schematic diagram of a first signaling indicating a second link identity according to an embodiment of the present application;

fig. 12 illustrates a block diagram of a processing device for use in the second node according to an embodiment of the present application.

Detailed Description

The technical solutions of the present application will be further described in detail with reference to the accompanying drawings, and it should be noted that the embodiments and features of the embodiments in the present application can be arbitrarily combined with each other without conflict.

Example 1

Embodiment 1 illustrates a flowchart of receiving a first MAC PDU and transmitting a second MAC PDU according to an embodiment of the present application, as shown in the attached fig. 1. In fig. 1, each block represents a step, and it is particularly emphasized that the sequence of the blocks in the figure does not represent a chronological relationship between the represented steps.

In embodiment 1, a first node in the present application receives a first MAC PDU in step 101; determining whether the target link layer identity belongs to a first set of identities in step 102; transmitting a second MAC PDU in step 103; determining whether the target link layer identity is a second link layer identity in step 104; the transmission of a MAC PDU comprising at least part of the bits of the first MAC SDU is discarded in step 105.

The first MAC PDU comprises a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least part of bits of a first link layer identity and at least part of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity; when the target link layer identity belongs to a first identity set, sending a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity; when the target link layer identity is a second link layer identity, abandoning to send the MAC PDU comprising at least part of bits in the first MAC SDU; the first set of identities comprises at least one link layer identity.

As an embodiment, the first node is a UE (User Equipment).

For one embodiment, the first MAC header includes the 16 most significant bits of the first link layer identity.

For one embodiment, the number of bits that the first MAC header includes the first link layer identity is configurable.

For one embodiment, the first MAC header includes 8 most significant bits of the second link layer identity.

For one embodiment, the number of bits that the first MAC header includes the second link layer identity is configurable.

As an embodiment, the second MAC header comprises at least part of bits of the second link layer identity.

For one embodiment, the second MAC header includes the 16 most significant bits of the second link layer identity.

For one embodiment, the number of bits that the second MAC header includes the second link layer identity is configurable.

For one embodiment, the second MAC header includes at least a portion of bits of the target link layer identity.

For one embodiment, the second MAC header includes 8 most significant bits of the target link layer identity.

For one embodiment, the number of bits that the second MAC header includes the target link layer identity is configurable.

As an embodiment, the first MAC header and the second MAC header are each a SL-SCH subheader.

As an embodiment, the first MAC header is applicable to all MAC SDUs in the first MAC PDU; the second MAC header is applicable to all MAC SDUs in the second MAC PDU.

As an embodiment, the number of bits included in the first MAC header and the number of bits included in the second MAC header are both positive integer multiples of 8.

As an embodiment, the number of bits included in the first MAC header is equal to the number of bits included in the second MAC header.

As an embodiment, the number of bits included in the first MAC subheader is longer than the number of bits included in the second MAC subheader.

As an embodiment, the number of bits included in the first MAC subheader is equal to the number of bits included in the second MAC subheader.

For one embodiment, the LCID field included in the first MAC subheader is 6 bits more than the LCID field included in the second MAC subheader.

As one embodiment, the Link layer identity includes a Link layer identifier.

As one embodiment, the Link layer identity includes a Link layer identity.

For one embodiment, the Link layer identity includes a Link layer ID.

For one embodiment, the link Layer identity includes Layer2 ID.

For one embodiment, the link Layer identity includes a Layer-2 ID.

For one embodiment, the link layer identity includes L2 ID.

As one embodiment, the target link layer identity is the link layer identity.

As one embodiment, the first link layer identity is the link layer identity.

As an embodiment, the second link layer identity is the link layer identity.

As an embodiment, all identities comprised by the first set of identities are the link layer identities.

As an embodiment, a serving cell of the first node configures the first identity set.

As an embodiment, other UEs in communication with the first node configure the first identity set.

As an embodiment, the first node configures the first identity set according to an internal algorithm.

As an embodiment, the first set of identities comprises K identities, where K is a positive integer.

As an example, the sentence "when the target link layer identity belongs to a first identity set" includes the following meanings: the target link layer identity is an element of the first set of identities.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: the partial bits do not include padding bits.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: the partial bits are at least 8 bits.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: the part of bits includes bits in the RLC PDU carried by the first MAC SDU.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: the part of bits include bits other than padding bits in the RLC PDU carried by the first MAC SDU.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: the part of bits comprise bits in the RLC SDU carried by the first MAC SDU.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: the part of bits include bits other than filling bits in the RLC SDU carried by the first MAC SDU.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: and the second MAC sub-PDU carries all RLC PDUs in the first MAC sub-PDU.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: and the second MAC sub-PDU carries all RLC SDUs in the first MAC sub-PDU.

As an embodiment, the sentence "the second MAC sub-PDU includes at least part of bits in the first MAC SDU" includes the following meanings: the second MAC sub-PDU carries a segment of at least one RLC SDU in the first MAC sub-PDU.

As an embodiment, the first MAC sub-PDU does not carry the target link layer identity.

As one embodiment, the act of foregoing transmitting a MAC PDU including at least a portion of the bits of the first MAC SDU includes passing the first MAC SDU to an upper layer entity.

As one embodiment, the act of foregoing transmitting a MAC PDU including at least a portion of the bits of the first MAC SDU includes assembling, by an upper entity, an upper layer SDU in the first MAC SDU.

As one embodiment, the act of foregoing transmission of a MAC PDU including at least a portion of the bits of the first MAC SDU includes delivering the first MAC SDU to an upper entity.

As an embodiment, the behavior abandoning transmitting the MAC PDU comprising at least part of the bits of the first MAC SDU comprises transmitting (deliverer) the first MAC SDU to an upper entity.

For one embodiment, the upper layer entity is an RLC entity.

As an embodiment, the upper layer entity is a layer2 entity.

As an embodiment, the upper layer entity is a PDCP entity.

As an embodiment, the behavior abandoning transmitting the MAC PDU including at least part of the bits of the first MAC SDU comprises: when the first MAC SDU carries PC5-RRC signaling, the carried PC5-RRC signaling is handed over to the PC5-RRC entity of the first node for processing.

As an embodiment, the behavior abandoning transmitting the MAC PDU including at least part of the bits of the first MAC SDU comprises: when the first MAC SDU carries PC5-RRC signaling, the carried PC5-S signaling is handed over to the PC5-S entity of the first node for processing.

As an embodiment, the behavior abandoning transmitting the MAC PDU including at least part of the bits of the first MAC SDU comprises: when the first MAC SDU carries PC5-RRC signaling, the carried PC5-S signaling is handed over to the V2x layer of the first node for processing.

As an embodiment, the behavior abandoning transmitting the MAC PDU including at least part of the bits of the first MAC SDU comprises: when the first MAC SDU carries PC5-RRC signaling, the carried PC5-S signaling is handed over to the V2x application layer process of the first node.

For one embodiment, the first MAC PDU is discarded when the target link layer claim does not belong to the first set of identities and the target link layer identity is not the second link layer identity.

As an embodiment, the first MAC PDU is transmitted over a Uu interface.

For one embodiment, the first MAC PDU is sent over the PC5 interface.

As an embodiment, the second MAC PDU is transmitted over a Uu interface.

For one embodiment, the second MAC PDU is sent over the PC5 interface.

As an embodiment, the first MAC PDU is transmitted through an stch (sidelink Traffic channel) channel.

As an embodiment, the first MAC PDU is transmitted through an scch (sidelink Control channel) channel.

As an embodiment, the first MAC PDU is transmitted over a pscch (physical sidelink control channel) channel.

As an embodiment, the first MAC PDU is transmitted through a pssch (physical sidelink shared channel) channel.

As an embodiment, the first MAC PDU is transmitted through a psbch (physical sidelink broadcast channel) channel.

As an embodiment, the first MAC PDU is transmitted over a SL-SCH channel.

As an embodiment, the first MAC PDU is transmitted over a sidelink (sidelink).

As an embodiment, the second MAC PDU is transmitted through an stch (sidelink Traffic channel) channel.

As an embodiment, the second MAC PDU is transmitted through an scch (sidelink Control channel) channel.

As an embodiment, the second MAC PDU is transmitted over a pscch (physical sidelink control channel) channel.

As an embodiment, the second MAC PDU is transmitted through a pssch (physical sidelink shared channel) channel.

As an embodiment, the second MAC PDU is transmitted through a psbch (physical sidelink broadcast channel) channel.

As an embodiment, the second MAC PDU is transmitted over a SL-SCH channel.

As an embodiment, the second MAC PDU is transmitted over a sidelink (sidelink).

Example 2

Embodiment 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in fig. 2. Fig. 2 illustrates a V2X communication architecture under a 5G NR (new radio, new air interface), LTE (Long-Term Evolution), and LTE-a (Long-Term Evolution Advanced, enhanced Long-Term Evolution) system architecture. The 5G NR or LTE network architecture may be referred to as 5GS (5 GSystem)/EPS (Evolved Packet System) or some other suitable terminology.

The V2X communication architecture of embodiment 2 includes UE (User Equipment) 201, UE241, NG-RAN (next generation radio access Network) 202, 5GC (5G Core Network )/EPC (Evolved Packet Core) 210, HSS (Home Subscriber Server )/UDM (Unified Data Management) 220, ProSe function 250, and ProSe application Server 230. The V2X communication architecture may interconnect with other access networks, but these entities/interfaces are not shown for simplicity. As shown, the V2X communication architecture provides packet switched services, however, those skilled in the art will readily appreciate that the various concepts presented throughout this application may be extended to networks providing circuit switched services or other cellular networks. The NG-RAN includes NR node b (gNB)203 and other gnbs 204. The gNB203 provides user and control plane protocol termination towards the UE 201. The gnbs 203 may be connected to other gnbs 204 via an Xn interface (e.g., backhaul). The gNB203 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), a TRP (transmitting receiving node), or some other suitable terminology. The gNB203 provides the UE201 with an access point to the 5GC/EPC 210. Examples of the UE201 include a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a Personal Digital Assistant (PDA), a satellite radio, a non-terrestrial base station communication, a satellite mobile communication, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a drone, an aircraft, a narrowband internet of things device, a machine type communication device, a terrestrial vehicle, an automobile, a wearable device, or any other similar functioning device. Those skilled in the art may also refer to UE201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. The gNB203 is connected to the 5GC/EPC210 through an S1/NG interface. The 5GC/EPC210 includes MME (Mobility Management Entity)/AMF (Authentication Management domain)/SMF (Session Management Function) 211, other MME/AMF/SMF214, S-GW (serving Gateway)/UPF (user plane Function) 212, and P-GW (Packet data Network Gateway)/UPF 213. The MME/AMF/SMF211 is a control node that handles signaling between the UE201 and the 5GC/EPC 210. In general, the MME/AMF/SMF211 provides bearer and connection management. All user IP (Internet protocol) packets are transported through the S-GW/UPF212, which S-GW/UPF212 itself is connected to the P-GW/UPF 213. The P-GW provides UE IP address allocation as well as other functions. The P-GW/UPF213 is connected to the internet service 230. The internet service 230 includes an operator-corresponding internet protocol service, and may specifically include the internet, an intranet, an IMS (IP Multimedia Subsystem), and a packet-switched streaming service. The ProSe function 250 is a logical function for network-related behavior required for location-based services (ProSe); including a DPF (Direct Provisioning Function), a Direct Discovery Name Management Function (Direct Discovery Name Management Function), an EPC-level Discovery ProSe Function (EPC-level Discovery ProSe Function), and the like. The ProSe application server 230 has the functions of storing EPC ProSe subscriber identities, mapping between application layer subscriber identities and EPC ProSe subscriber identities, allocating a ProSe restricted code suffix pool, and the like.

As an embodiment, the UE201 and the UE241 are connected through a Reference Point (Reference Point) of the PC 5.

As an embodiment, the ProSe function 250 is connected with the UE201 and the UE241 through PC3 reference points, respectively.

As an embodiment, the ProSe function 250 is connected with the ProSe application server 230 through a PC2 reference point.

As an embodiment, the ProSe application server 230 is connected with the ProSe application of the UE201 and the ProSe application of the UE241 through a PC1 reference point, respectively.

As an embodiment, the first node and the second node in the present application are UE201 and UE241, respectively.

As an embodiment, the wireless link between the UE201 and the UE241 corresponds to a Sidelink (SL) in the present application.

As an embodiment, the UE201 supports relay transmission.

As an embodiment, the UE241 supports relay transmission.

Example 3

Embodiment 3 shows a schematic diagram of an embodiment of a radio protocol architecture for the user plane and the control plane according to the present application, as shown in fig. 3. Fig. 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, fig. 3 showing the radio protocol architecture for the control plane 300 between a first node (UE, satellite or aircraft in a gNB or NTN) and a second node (gNB, satellite or aircraft in a UE or NTN), or two UEs, in three layers: layer 1, layer2 and layer 3. Layer 1(L1 layer) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to herein as PHY 301. Layer 2(L2 layer) 305 is above PHY301 and is responsible for the link between the first and second nodes and the two UEs through PHY 301. The L2 layer 305 includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the second node. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security by ciphering data packets and provides handoff support between second nodes to the first node. The RLC sublayer 303 provides segmentation and reassembly of upper layer packets, retransmission of lost packets, and reordering of packets to compensate for out-of-order reception due to HARQ. The MAC sublayer 302 provides multiplexing between logical and transport channels. The MAC sublayer 302 is also responsible for allocating the various radio resources (e.g., resource blocks) in one cell between the first nodes. The MAC sublayer 302 is also responsible for HARQ operations. A RRC (Radio Resource Control) sublayer 306 in layer 3 (layer L3) in the Control plane 300 is responsible for obtaining Radio resources (i.e., Radio bearers) and configuring the lower layers using RRC signaling between the second node and the first node, wherein the signaling handled by the RRC sublayer includes PC 5-RRC. The PC5-S (PC5Signaling Protocol ) sublayer 307 is responsible for processing the Signaling Protocol of the PC5 interface. The radio protocol architecture of the user plane 350 includes layer 1(L1 layer) and layer 2(L2 layer), the radio protocol architecture in the user plane 350 for the first and second nodes is substantially the same for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355 as the corresponding layers and sublayers in the control plane 300, but the PDCP sublayer 354 also provides header compression for upper layer packets to reduce radio transmission overhead. The L2 layer 355 in the user plane 350 further includes an SDAP (Service Data Adaptation Protocol) sublayer 356, and the SDAP sublayer 356 is responsible for mapping between QoS streams and Data Radio Bearers (DRBs) to support diversity of services. Although not shown, the first node may have several upper layers above the L2 layer 355. Also included are a network layer (e.g., IP layer) that terminates at the P-GW on the network side and an application layer that terminates at the other end of the connection (e.g., far end UE, server, etc.).

As an example, the wireless protocol architecture in fig. 3 is applicable to the first node in this application.

As an example, the radio protocol architecture in fig. 3 is applicable to the second node in this application.

As an embodiment, the first MAC PDU in the present application is generated in the MAC302 or the MAC 352.

As an embodiment, the second MAC PDU in the present application is generated in the MAC302 or the MAC 352.

As an embodiment, the first signaling in this application is generated in the PHY351 or the MAC302 or the MAC 352.

As an embodiment, the second signaling in this application is generated in the PHY351 or the MAC302 or the MAC 352.

As an embodiment, the third signaling in this application is generated in the PC5-S307 or RRC 306.

Example 4

Embodiment 4 shows a schematic diagram of a first communication device and a second communication device according to the present application, as shown in fig. 4. Fig. 4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

The first communications device 450 includes a controller/processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter/receiver 454, and an antenna 452.

The second communication device 410 includes a controller/processor 475, a memory 476, a receive processor 470, a transmit processor 416, a multiple antenna receive processor 472, a multiple antenna transmit processor 471, a transmitter/receiver 418, and an antenna 420.

In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, upper layer data packets from the core network are provided to the controller/processor 475. The controller/processor 475 implements the functionality of layer L2. In transmissions from the second communications device 410 to the first communications device 450, the controller/processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communications device 450 based on various priority metrics. The controller/processor 475 is also responsible for retransmission of lost packets, and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 implements coding and interleaving to facilitate Forward Error Correction (FEC) at the second communication device 410, as well as mapping of signal constellation based on various modulation schemes (e.g., Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based precoding and non-codebook based precoding, and beamforming processing on the coded and modulated symbols to generate one or more spatial streams. Transmit processor 416 then maps each spatial stream to subcarriers, multiplexes with reference signals (e.g., pilots) in the time and/or frequency domain, and then uses an Inverse Fast Fourier Transform (IFFT) to generate the physical channels carrying the time-domain multicarrier symbol streams. The multi-antenna transmit processor 471 then performs transmit analog precoding/beamforming operations on the time domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multicarrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream that is then provided to a different antenna 420.

In transmissions from the second communications apparatus 410 to the first communications apparatus 450, each receiver 454 receives a signal at the first communications apparatus 450 through its respective antenna 452. Each receiver 454 recovers information modulated onto a radio frequency carrier and converts the radio frequency stream into a baseband multi-carrier symbol stream that is provided to a receive processor 456. The receive processor 456 and the multiple antenna receive processor 458 implement various signal processing functions of the L1 layer. A multi-antenna receive processor 458 performs receive analog precoding/beamforming operations on the baseband multi-carrier symbol stream from the receiver 454. Receive processor 456 converts the baseband multi-carrier symbol stream after a receive analog precoding/beamforming operation from the time domain to the frequency domain using a Fast Fourier Transform (FFT). In the frequency domain, the physical layer data signals and the reference signals to be used for channel estimation are demultiplexed by the receive processor 456, and the data signals are subjected to multi-antenna detection in the multi-antenna receive processor 458 to recover any spatial streams destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered at a receive processor 456 and soft decisions are generated. The receive processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communications device 410 on the physical channel. The upper layer data and control signals are then provided to a controller/processor 459. The controller/processor 459 implements the functionality of the L2 layer. The controller/processor 459 may be associated with a memory 460 that stores program codes and data. Memory 460 may be referred to as a computer-readable medium. In transmissions from the second communications device 410 to the second communications device 450, the controller/processor 459 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the core network. The upper layer packet is then provided to all protocol layers above the L2 layer. Various control signals may also be provided to L3 for L3 processing.

In a transmission from the first communications device 450 to the second communications device 410, a data source 467 is used at the first communications device 450 to provide upper layer data packets to a controller/processor 459. Data source 467 represents all protocol layers above the L2 layer. Similar to the send function at the second communications apparatus 410 described in the transmission from the second communications apparatus 410 to the first communications apparatus 450, the controller/processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocation, implementing L2 layer functions for the user plane and control plane. The controller/processor 459 is also responsible for retransmission of lost packets and signaling to said second communications device 410. A transmit processor 468 performs modulation mapping, channel coding, and digital multi-antenna spatial precoding by a multi-antenna transmit processor 457 including codebook-based precoding and non-codebook based precoding, and beamforming, and the transmit processor 468 then modulates the resulting spatial streams into multi-carrier/single-carrier symbol streams, which are provided to different antennas 452 via a transmitter 454 after analog precoding/beamforming in the multi-antenna transmit processor 457. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream and provides the radio frequency symbol stream to the antenna 452.

In a transmission from the first communication device 450 to the second communication device 410, the functionality at the second communication device 410 is similar to the receiving functionality at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives radio frequency signals through its respective antenna 420, converts the received radio frequency signals to baseband signals, and provides the baseband signals to a multi-antenna receive processor 472 and a receive processor 470. The receive processor 470 and the multiple antenna receive processor 472 collectively implement the functionality of the L1 layer. Controller/processor 475 implements the L2 layer functions. The controller/processor 475 can be associated with a memory 476 that stores program codes and data. Memory 476 may be referred to as a computer-readable medium. In transmission from the first communications device 450 to the second communications device 410, the controller/processor 475 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the UE 450. Upper layer data packets from the controller/processor 475 may be provided to a core network.

As an embodiment, the first communication device 450 apparatus includes: at least one processor and at least one memory including computer program code; the at least one memory and the computer program code configured to, for use with the at least one processor, the first communication device 450 apparatus at least: receiving a first MAC PDU, the first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least a portion of bits of a first link layer identity and at least a portion of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity; when the target link layer identity belongs to a first identity set, sending a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity; when the target link layer identity is a second link layer identity, abandoning to send the MAC PDU comprising at least part of bits in the first MAC SDU; wherein the first set of identities comprises at least one link layer identity.

As an embodiment, the first communication device 450 includes: a memory storing a program of computer readable instructions that when executed by at least one processor result in actions comprising: receiving a first MAC PDU, the first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least a portion of bits of a first link layer identity and at least a portion of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity; when the target link layer identity belongs to a first identity set, sending a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity; when the target link layer identity is a second link layer identity, abandoning to send the MAC PDU comprising at least part of bits in the first MAC SDU; wherein the first set of identities comprises at least one link layer identity.

As an embodiment, the second communication device 410 apparatus includes: at least one processor and at least one memory including computer program code; the at least one memory and the computer program code are configured for use with the at least one processor. The second communication device 410 means at least: transmitting a first MAC PDU, the first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least a portion of bits of a first link layer identity and at least a portion of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity; when the target link layer identity belongs to a first identity set, a receiver of the first MAC PDU sends a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity; when the target link layer identity is a second link layer identity, a receiver of the first MAC PDU abandons sending the MAC PDU comprising at least part of bits in the first MAC SDU; wherein the first set of identities comprises at least one link layer identity.

As an embodiment, the first communication device 450 corresponds to a first node in the present application.

As an embodiment, the second communication device 410 corresponds to a second node in the present application.

For one embodiment, the first communication device 450 is a UE.

As an embodiment, the first communication device 450 is a vehicle-mounted terminal.

For one embodiment, the second communication device 410 is a UE.

As an embodiment, the first communication device 410 is a vehicle-mounted terminal.

For one embodiment, a receiver 456 (including an antenna 460), a receive processor 452, and a controller/processor 490 are used to receive the first MAC PDU.

For one embodiment, receiver 456 (including antenna 460), receive processor 452, and controller/processor 490 are used to receive the first signaling.

For one embodiment, receiver 456 (including antenna 460), receive processor 452, and controller/processor 490 are used to receive the third signaling.

For one embodiment, a transmitter 456 (including an antenna 460), a transmit processor 455, and a controller/processor 490 are used to transmit the second MAC PDU.

For one embodiment, a transmitter 456 (including an antenna 460), a transmit processor 455, and a controller/processor 490 are used to send the second signaling.

For one embodiment, the transmitter 416 (including the antenna 420), the transmit processor 412, and the controller/processor 440 are used to transmit the first signaling in this application.

For one embodiment, a transmitter 416 (including antenna 420), a transmit processor 412, and a controller/processor 440 are used to transmit the first MAC PDU in this application.

For one embodiment, the transmitter 416 (including the antenna 420), the transmit processor 412, and the controller/processor 440 are used to transmit the third signaling.

Example 5

Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in fig. 5. In fig. 5, U01 corresponds to the first node of the present application and U02 corresponds to the second node of the present application, and it is specifically illustrated that the sequence in the present example does not limit the sequence of signal transmission and the sequence of implementation in the present application, wherein the steps in F51 and F52 are optional.

For theFirst node U01Receiving a third signaling in step S5101; receiving a first signaling in step S5102; receiving a first MAC PDU in step S5103; in step S5104, determining whether the target link layer identity belongs to a first identity set; in step S5105When the link layer identity is marked as a second link layer identity, abandoning and sending the MAC PDU comprising at least part of bits in the first MAC SDU; transmitting a second signaling in step S5111; the second MAC PDU is transmitted in step S5112.

For theSecond node U02Transmitting the third signaling in step S5201; receiving the first signaling in step S5202; transmitting the first MAC PDU in step S5203;

in embodiment 5, the first MAC PDU comprises a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least part of bits of a first link layer identity and at least part of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity; when the target link layer identity belongs to a first identity set, sending a second MAC PDU, wherein the second MAC PDU comprises a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprises a second MAC sub-header, the second MAC sub-PDU comprises at least part of bits in the first MAC SDU, and the second MAC header comprises at least part of bits of the target link layer identity; when the target link layer identity is a second link layer identity, abandoning to send the MAC PDU comprising at least part of bits in the first MAC SDU; wherein the first set of identities comprises at least one link layer identity.

For one embodiment, the communication interface between the first node U01 and the second node U02 is a PC 5.

For one embodiment, the communication interface between the first node U01 and the second node U02 is Uu.

For one embodiment, the third signaling includes PC5-RRC (Radio Resource Control) signaling.

As an embodiment, the third signaling comprises RRC signaling.

For one embodiment, the third signaling comprises PC5-S signaling.

As an embodiment, the third signaling is PC5-S signaling.

As an embodiment, the third signaling comprises application layer signaling.

As an embodiment, the third signaling comprises ProSe signaling.

As an embodiment, the third signaling is sent on a Uu interface.

As an embodiment, the third signaling is sent over a PC5 interface.

As an embodiment, the third signaling is transmitted through an scch (sidelink Control channel) channel.

As an embodiment, the third signaling is transmitted through an stch (sidelink Traffic channel) channel.

As an embodiment, the third signaling is transmitted through a pscch (physical sidelink control channel) channel.

As an embodiment, the third signaling is transmitted through a pssch (physical sidelink shared channel) channel.

As an embodiment, the third signaling is transmitted through a psbch (physical sidelink broadcast channel) channel.

As an embodiment, the third signaling is transmitted over a SL-SCH channel.

As an embodiment, the third signaling is transmitted through a sidelink (sidelink).

As an embodiment, the third signaling is used to configure a DRB.

As an embodiment, the third signaling is used to configure an RB.

As an embodiment, the third signaling comprises RRCReconfigurationSidelink.

As an embodiment, the third signaling includes a partial field (field) in RRCReconfigurationSidelink.

As an embodiment, the third signaling comprises rrcreeconfiguration.

As an embodiment, the third signaling includes SIB 12.

As an embodiment, the third signaling comprises SL-LogicalChannelConfigPC 5.

As an embodiment, the third signaling comprises SL-LogicalChannelConfig.

As an embodiment, the third signaling comprises SL-LogicalChannelConfig-r 16.

As an embodiment, the third signaling comprises SL-LogicalChannelConfig-r 17.

As an embodiment, the third signaling comprises a part of the field in SL-logical channelconfig.

For one embodiment, the third signaling comprises sl-RLC-Config.

For one embodiment, the third signaling comprises sl-RLC-Config-r 16.

For one embodiment, the third signaling comprises sl-RLC-Config-r 17.

As an embodiment, the third signaling comprises a part of a field in the sl-RLC-Config.

As an embodiment, the third signaling comprises an sl-logical channelgroup.

As an embodiment, the third signaling comprises rrcconnectionreconfiguration sildelink.

As an embodiment, the third signaling comprises RRCConnectionReconfiguration.

As an example, the third signaling includes DIRECT LINK MODIFICATION REQUEST.

As an embodiment, the third signaling includes DIRECT LINK MODIFICATION ACCEPT.

For one embodiment, the third signaling includes DIRECT LINK KEEPALIVE REQUEST.

For one embodiment, the third signaling includes DIRECT LINK KEEPALIVE RESPONSE.

As an embodiment, the third signaling comprises a program REQUEST.

As an embodiment, the third signaling includes program REQUEST RESPONSE.

As an embodiment, the third signaling includes program _ ALERT.

As an embodiment, the third signaling includes program REQUEST valid.

As an embodiment, the third signaling includes program REQUEST valid RESPONSE.

As an embodiment, the third signaling comprises discover UPDATE REQUEST.

As an embodiment, the third signaling comprises discover UPDATE RESPONSE.

As an embodiment, the third signaling includes a Direct Security Mode Command.

As an embodiment, the third signaling includes Direct Security Mode Complete.

As an embodiment, the third signaling includes a Link Identifier Update Request.

As an embodiment, the third signaling includes a Link Identifier Update Response.

As an embodiment, the third signaling includes a Link Identifier Update Ack.

As an embodiment, the third signaling comprises NAS (non access stratum) signaling.

As an embodiment, the third signaling is higher layer signaling.

As an embodiment, the third signaling is rrcreconfigurable sidelink IE (Information Element).

As an embodiment, the third signaling comprises at least part of a field in RRCReconfigurationSidelink.

As one embodiment, the first field in the first MAC sub-PDU is included by the first MAC header.

As an embodiment, the first field in the first MAC sub-PDU is included by the first MAC SDU.

As an embodiment, the third signaling indicates a mapping relationship of the first domain to a link layer identity; the target link layer identity is determined by the first domain in the first MAC sub-PDU according to a mapping of the first domain to link layer identities.

As a sub-embodiment of this embodiment, the first MAC sub-PDU includes the first field.

As a sub-embodiment of this embodiment, the first MAC subheader includes the first field.

As a sub-embodiment of this embodiment, the first MAC SDU comprises the first field.

As a sub-embodiment of this embodiment, the upper layer PDU included in the first MAC SDU includes the first field.

As a sub-embodiment of this embodiment, a header of an upper layer PDU included in the first MAC SDU includes the first field.

As a sub-embodiment of this embodiment, an SN field of a header of an upper layer PDU included in the first MAC SDU includes the first field.

As a sub-embodiment of this embodiment, the LCID field in the first MAC subheader includes the first field.

As a sub-embodiment of this embodiment, the SRC domain in the first MAC subheader includes the first domain.

As a sub-embodiment of this embodiment, the DST field in the first MAC subheader includes the first field.

As a sub-embodiment of this embodiment, the Link identifier field in the first MAC subheader includes the first field.

As a sub-embodiment of this embodiment, the Link identity field in the first MAC subheader includes the first field.

As a sub-embodiment of this embodiment, the R field in the first MAC subheader includes the first field.

As a sub-embodiment of this embodiment, a combination of a plurality of R fields in the first MAC subheader includes the first field.

As a sub-embodiment of this embodiment, there is a one-to-one mapping of the first domain to a link layer identity.

As a sub-embodiment of this embodiment, there is a many-to-one mapping of the first domain to a link layer identity.

As a sub-embodiment of this embodiment, the third signaling indication maps to values of all the first domains of a link layer identity.

As a sub-embodiment of this embodiment, the third signaling indication is mapped to a value range of the first domain of a link layer identity.

As a sub-embodiment of this embodiment, the third signaling indicates a mapping table of the first domain to link layer identities.

As a sub-embodiment of this embodiment, the third signaling indicates a mapping of each value of the first domain to its associated link layer identity.

For one embodiment, the first field includes an LCID field in the first MAC subheader.

As an embodiment, the first field includes an SN field in a header of an RLC PDU carried by the first MAC SDU.

For one embodiment, the first field includes a link identity field included in the first MAC sub-PDU.

As an embodiment, the first field includes a link identifier field included in the first MAC sub-PDU.

As an embodiment, the first field includes a unique link identifier field included in the first MAC sub-PDU.

As an embodiment, the first field includes a unicast link ID field included in the first MAC sub-PDU.

As an embodiment, the first field includes a link ID field included in the first MAC sub-PDU.

As an embodiment, the first field includes an application layer identity field included in the first MAC SDU.

As an embodiment, the first field includes an Application Layer ID field included in the first MAC SDU.

As an embodiment, the first field includes an Application Layer ID field in PC5-S signaling included in the first MAC SDU.

As an embodiment, the first domain comprises a relay identity domain comprised by the first MAC sub-PDU.

As an embodiment, the first field includes a Relay ID field included in the first MAC sub-PDU.

For one embodiment, the first field includes a Relay Code field included in the first MAC sub-PDU.

For one embodiment, the first domain includes a bearer identity.

For one embodiment, the first domain includes a bearer index.

As one embodiment, the first domain includes a flow identity (flow ID).

For one embodiment, the first domain comprises a SL-RADIO BEAREConfigIndex.

As an embodiment, the first field includes a bearer identity field included in a header of a PDCP PDU carried by the first MAC SDU.

As an embodiment, the first field includes a bearer identity field carried by reserved bits included in a header of a PDCP PDU carried by the first MAC SDU.

As an embodiment, the first field includes a link identity field included in a header of a PDCP PDU carried by the first MAC SDU.

As an embodiment, the first field includes a SN field included in a header of a PDCP PDU carried by the first MAC SDU.

As one embodiment, the first signaling includes physical layer signaling.

As one embodiment, the first signaling includes MAC layer signaling.

As an embodiment, the first signaling is sent over a PC5 interface.

As an embodiment, the first signaling is transmitted over a SL-SCH channel.

As an embodiment, the first signaling is transmitted through a sidelink (sidelink).

As an embodiment, the first signaling is transmitted through an scch (sidelink Control channel) channel.

As an embodiment, the first signaling is transmitted over a PSCCH channel.

As an embodiment, the first signaling is transmitted over a psch channel.

For one embodiment, the first signaling includes SCI.

As an embodiment, the first signaling indicates a resource occupied by the first MAC PDU.

As an embodiment, the first signaling indicates an RV used by the first MAC PDU.

As one embodiment, the first signaling indicates an MCS used by the first MAC PDU.

As an embodiment, the first signaling and the first MAC header together indicate the first link layer identity and the second link layer identity.

As an embodiment, the first signaling comprises a partial bit of the first link layer identity.

As an embodiment, the first signaling includes a first part of bits of the first link layer identity, and the first MAC header includes a second part of bits of the first link identity; an intersection of the first partial bits and the second partial bits is empty, the first partial bits and the second partial bits including all bits of the first link layer identity.

As an embodiment, the first signaling includes a third part of bits of the second link layer identity, and the first MAC header includes a fourth part of bits of the second link identity; an intersection of the third partial bit and the fourth partial bit is null, and the first partial bit and the second partial bit include all bits of the first link layer identity.

For one embodiment, the first signaling comprises 8 least significant bits of the first link layer identity.

As a sub-embodiment of this embodiment, the first MAC header includes all bits of the first link layer identity except the 8 least significant bits.

As an embodiment, the first signaling comprises the 16 least significant bits of the second link layer identity, and the first MAC header comprises all bits of the first link layer identity except the 16 least significant bits.

As an embodiment, the sentence that the "the first signaling and the first MAC header together indicate the first link layer identity and the second link layer identity" includes: the first signaling indicates K1 bits of the first link layer identity, where K1 is a positive integer, the first MAC header indicates all but the K1 bits in the first link layer identity, and all but the K1 bits in the first link layer identity include at least one bit.

As an embodiment, the sentence that the "the first signaling and the first MAC header together indicate the first link layer identity and the second link layer identity" includes: the first signaling indicates K2 bits of the second link layer identity, where K2 is a positive integer, the first MAC header indicates all but the K2 bits in the second link layer identity, and all but the K2 bits in the second link layer identity include at least one bit.

As an embodiment, when the target link layer identity does not belong to the first identity set, the target link layer identity must be equal to the second link layer identity.

As an embodiment, when the target link layer identity does not belong to the first identity set, the target link layer identity may be an identity other than the second link layer identity, and the target link layer identity is an identity other than the second link layer identity.

As an embodiment, when the target link layer identity does not belong to the first identity set, the target link layer identity belongs to a second identity set, an intersection of the second identity set with the first identity set being empty, the second identity set comprising at least one link layer identity, the second identity set not comprising the second link layer identity; when the target link-layer identity belongs to the second set of identities, the first node U01 sending a third MAC PDU, the third MAC PDU comprising a third MAC header, the third MAC header comprising link-layer identities other than the link-layer identities comprised by the first MAC header and the second MAC header; the third MAC PDU includes at least a portion of bits of the first MAC SDU.

As a sub-embodiment of this embodiment, the DST field of the second MAC header and the DST field of the third MAC header include different bits.

As an embodiment, the first link layer identity is a source identity of the first MAC PDU and the second link layer identity is a destination identity of the first MAC PDU.

For one embodiment, the second link layer identity determines the first node U01.

For one embodiment, the first link layer identity determines the second node U02.

As one embodiment, the second signaling includes physical layer signaling.

As one embodiment, the second signaling comprises MAC layer signaling.

As an embodiment, the second signaling is sent over a PC5 interface.

As an embodiment, the second signaling is transmitted over a SL-SCH channel.

As an embodiment, the second signaling is transmitted through a sidelink (sidelink).

As an embodiment, the second signaling is transmitted through an scch (sidelink Control channel) channel.

As an embodiment, the second signaling is transmitted over a PSCCH channel.

As an embodiment, the second signaling is transmitted over a psch channel.

For one embodiment, the second signaling includes SCI.

As an embodiment, the second signaling indicates a resource occupied by the second MAC PDU.

As an embodiment, the second signaling indicates an RV used by the second MAC PDU.

As one embodiment, the second signaling indicates an MCS used by the second MAC PDU.

As an embodiment, the second signaling and the second MAC header together indicate the target link layer identity.

As an embodiment, the second signaling and the second MAC header together indicate the second link layer identity.

As an embodiment, the second signaling comprises a partial bit of the target link layer identity.

As an embodiment, the second signaling includes a first part of bits of the target link layer identity, and the second MAC header includes a second part of bits of the target link layer identity; an intersection of the first part of bits of the target link layer identity and the second part of bits of the target link layer identity is null, and the first part of bits of the target link layer identity and the second part of bits of the target link layer identity include all bits of the target link layer identity.

As an embodiment, the second signaling comprises 16 least significant bits of the target link layer identity, and the second MAC header comprises all bits other than the 16 least significant bits of the target link layer identity.

As an embodiment, the sentence that the "the second signaling and the second MAC header together indicate the target link layer identity" comprises: the second signaling indicates K3 bits of the target link layer identity, where K3 is a positive integer, the second MAC header indicates all bits of the target link layer identity other than the K3 bits, and the all bits of the target link layer identity other than the K3 bits comprise at least one bit.

As an embodiment, the DST field of the second MAC header includes 8 most significant bits of the target link layer identity.

For one embodiment, the second MAC header does not include the first link layer identity.

As an embodiment, the SRC domain of the second MAC header only includes an identity other than the first link layer identity.

As an embodiment, the DST field of the second MAC header only comprises an identity other than the first link layer identity.

As an embodiment, the target link layer identity is a link layer identity other than the second link layer identity when the second MAC PDU is transmitted.

Example 6

Embodiment 6 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in fig. 6. In fig. 6, U11 corresponds to the first node of the present application, U12 corresponds to the second node of the present application, and U13 corresponds to the third node of the present application, and it is specifically noted that the sequence in the present example does not limit the sequence of signal transmission and the sequence of implementation in the present application. Example 6 is based on example 5, and the parts required but not shown in example 6 can be found in example 5, where the steps in F61 and F62 are optional.

For theFirst node U11Receiving a first signaling in step S6101; receiving a first MAC PDU in step S6102; transmitting a second signaling in step S6103; transmitting a second MAC PDU in step S6104;

for theSecond node U12Sending the first signaling in step S6201; transmitting the first MAC PDU in step S6202;

for theThird node U13Receiving the second signaling in step S6301; receiving the second MAC PDU in step S6302.

As an embodiment, the first signaling includes configuration information of a first channel, and a channel occupied by the first MAC PDU includes the first channel; the first signaling and the first MAC PDU collectively include the first link layer identity and the second link layer identity.

As an embodiment, the second signaling includes configuration information of a second channel, and a channel occupied by the second MAC PDU includes the second channel; the second signaling and the second MAC PDU collectively include the target link layer identity.

As an embodiment, the first signaling is physical layer signaling.

As an embodiment, the second signaling is physical layer signaling.

For one embodiment, the first signaling includes dci (downlink Control information).

For one embodiment, the first signaling includes sci (sidelink Control information).

As an embodiment, the configuration information of the first channel includes time-frequency resource information.

As one embodiment, the configuration information of the first channel includes Redundancy Version (RV) information.

As one embodiment, the configuration information of the first channel includes New Data Indication (NDI) information.

As an embodiment, the configuration information of the first channel includes HARQ information.

For one embodiment, the first channel comprises a PSSCH channel.

As one embodiment, the first channel comprises a PDSCH channel.

As one embodiment, the first channel comprises a PSCCH channel.

As an embodiment, the first signaling comprises a part of bits of the first link layer identity, and the first MAC PDU comprises all other bits of the first identity.

For one embodiment, the first signaling includes N1 Most Significant Bits (MSB) of the first link layer identity, and the first MAC PDU includes all bits of the first link layer identity other than the N1 most significant bits, where N1 is an integer greater than 0.

As a sub-embodiment of this embodiment, the number of all bits other than the N1 most significant bits is greater than zero.

For one embodiment, the first MAC PDU includes N11 Most Significant Bits (MSB) of the first link layer identity, and the first signaling includes all bits of the first link layer identity other than the N11 most significant bits, where N11 is an integer greater than 0.

As a sub-embodiment of this embodiment, the number of all bits other than the N11 most significant bits is greater than zero.

For one embodiment, the first signaling includes N2 Least Significant Bits (LSBs) of the first link layer identity, and the first MAC PDU includes all bits other than the N2 least significant bits of the first link layer identity, where N2 is an integer greater than 0.

As a sub-embodiment of this embodiment, the number of all other bits than the N2 least significant bits of the first link layer identity is greater than 0.

For one embodiment, the first signaling includes N3 Most Significant Bits (MSB) of the second link layer identity, and the first MAC PDU includes all bits of the second link layer identity other than the N3 most significant bits, where N3 is an integer greater than 0.

As a sub-embodiment of this embodiment, all bits other than the N3 most significant bits include at least one bit.

For one embodiment, the first signaling includes N4 Least Significant Bits (LSBs) of the second link layer identity, and the first MAC PDU includes all bits other than the N4 least significant bits of the second link layer identity, where N4 is an integer greater than 0.

As a sub-embodiment of this embodiment, all other bits than the N4 least significant bits include at least one bit.

As an example, N2 equals 8 and N4 equals 16.

As an example, N1 equals 8 and N3 equals 16.

As one example, N11 is equal to 8.

As one example, N11 is equal to 16.

For one embodiment, the second signaling includes dci (downlink Control information).

For one embodiment, the second signaling includes sci (sidelink Control information).

As an embodiment, the physical layer channel occupied by the second signaling includes PSCCH.

As an embodiment, the physical layer channel occupied by the second signaling includes a PDCCH.

As an embodiment, the second signaling includes time-frequency resource information occupied by the second MAC PDU.

As an embodiment, the second signaling includes scheduling information of the second MAC PDU.

As one embodiment, the second channel includes a PDSCH.

For one embodiment, the second channel includes a PSSCH.

As an embodiment, the configuration information of the second channel includes time-frequency resource information.

As one embodiment, the configuration information of the second channel includes Redundancy Version (RV) information.

As one embodiment, the configuration information of the second channel includes New Data Indication (NDI) information.

As an embodiment, the configuration information of the second channel includes HARQ information.

For one embodiment, the second channel comprises a PSSCH channel.

As one embodiment, the second channel comprises a PDSCH channel.

For one embodiment, the second channel comprises a PSCCH channel.

As an embodiment, the second signaling includes a part of bits of the target link layer identity, and the second MAC PDU includes other bits of the target link layer identity.

For one embodiment, the second signaling includes W1 Most Significant Bits (MSB) of the target link layer identity, and the second MAC PDU includes all bits of the target link layer identity other than the W1 most significant bits, where W1 is an integer greater than 0.

As a sub-embodiment of this embodiment, all bits other than the W1 most significant bits include at least one bit.

For one embodiment, the second signaling includes W2 Least Significant Bits (LSB) of the target link layer identity, and the second MAC PDU includes all bits other than the W2 least significant bits of the target link layer identity, where W2 is an integer greater than 0.

As a sub-embodiment of this embodiment, all bits other than the W2 least significant bits include at least one bit.

As one example, W2 is equal to 8.

As one example, W1 is equal to 8.

As one example, W2 is equal to 16.

As one example, W1 is equal to 16.

For one embodiment, the target link layer identity determines the third node U13.

As an embodiment, the DST field of the second MAC header includes the target link layer identity.

As an embodiment, the second MAC header includes at least part of bits of a third link layer identity, the first MAC sub-PDU implicitly indicates the third link layer identity; the third link layer identity is different from the target link layer identity.

For one embodiment, the third link layer identity determines the first node U11.

For one embodiment, the second MAC header includes the third link layer.

For one embodiment, the second MAC header includes the second link layer.

For an embodiment, the SRC domain of the second MAC header includes the third link layer.

For an embodiment, the SRC domain of the second MAC header includes the second link layer.

As an embodiment, the third link layer identity is a link layer identity.

For one embodiment, the third link layer identity is a link layer identity other than the second link layer identity.

As an embodiment, the third link layer identity is a layer2 identity other than the second link layer identity.

As an embodiment, the second signaling and the second MAC PDU together indicate the third link layer identity.

As an embodiment, the second signaling comprises 8 least significant bits of the third link layer identity; the second MAC header includes the 16 most significant bits of the third link layer identity.

As an embodiment, the second MAC PDU comprises at least part of the bits of the third link layer identity when the target link layer identity belongs to the first identity set.

Example 7

Embodiment 7 illustrates a schematic diagram of a MAC PDU according to an embodiment of the present invention, as shown in fig. 7.

In embodiment 7, one MAC PDU includes one MAC Header and at least one MAC sub PDU (sub PDU); the MAC header includes a source identity, a destination identity, and other bits.

As an embodiment, the MAC PDU is transmitted on SL-SCH (SideLink Shared CHannel).

As an embodiment, the number of bits included in the MAC header is fixed.

As an embodiment, the number of bits included in the MAC header is 32.

For one embodiment, the MAC header is a SL-SCH MAC subheader (subheader).

For one embodiment, the MAC header is a SL-SCH subheader (subheader).

As an embodiment, the further bits comprise 5 fields, V, R, R, R, R, the number of bits comprised being 4, 1, respectively.

As an embodiment, the source identity and the destination identity comprise 16 bits and 8 bits, respectively.

As an embodiment, the source identity in the MAC header and the destination identity in the MAC header are the SRC domain and the DST domain, respectively.

As an embodiment, each MAC sub-PDU includes one MAC sub-header and one MAC SDU, and the MAC sub-header in each MAC sub-PDU includes an LCID field (Logical Channel IDentifier), where the LCID field indicates a Channel identity of a Logical Channel corresponding to the corresponding MAC SDU.

For one embodiment, the LCID field includes 5 bits.

For one embodiment, the LCID field includes 6 bits.

As an embodiment, each MAC PDU is also allowed to include padding bits (padding).

As an embodiment, one MAC sub-PDU includes an RLC PDU.

As an embodiment, one MAC sub-PDU includes a MAC CE.

For one embodiment, the first MAC PDU comprises a second MAC sub-PDU implicitly indicating a second target link layer identity; the second target link layer identity is an identity other than the target link layer identity; only one of the target link layer identity and the second target link layer identity belongs to the first set of identities.

As a sub-embodiment of this embodiment, the second target link layer identity is determined by the second realm in the second MAC sub-PDU according to a mapping relationship of the second realm to link layer identity.

As a sub-embodiment of this embodiment, the second MAC sub-PDU includes a fourth MAC sub-header.

As a sub-embodiment of this embodiment, the second field is an LCID field in the fourth MAC subheader.

As a sub-embodiment of this embodiment, the second field is an SN field in a header of an RLC PDU carried by the second MAC SDU.

As a sub-embodiment of this embodiment, the second field is a link identity field included in the second MAC sub-PDU.

As a sub-embodiment of this embodiment, the second field is a link identifier field included in the second MAC sub-PDU.

As a sub-embodiment of this embodiment, the second field is a unique link identifier field included in the second MAC sub-PDU.

As a sub-embodiment of this embodiment, the second field is a unique link ID field included in the second MAC sub-PDU.

As a sub-embodiment of this embodiment, the second field is a link ID field included in the second MAC sub-PDU.

As a sub-embodiment of this embodiment, the second field is an application layer identity field included in the second MAC SDU.

As a sub-embodiment of this embodiment, the second field is an Application Layer ID field included in the second MAC SDU.

As a sub-embodiment of this embodiment, the second field is an Application Layer ID field in PC5-S signaling included in the first MAC SDU.

As a sub-embodiment of this embodiment, the second field is a relay identity field included in the second MAC sub-PDU.

As a sub-embodiment of this embodiment, the second field is a Relay ID field included in the second MAC sub-PDU.

As a sub-embodiment of this embodiment, the second field is a Relay Code field included in the second MAC sub-PDU.

As a sub-embodiment of this embodiment, the first node receives a fifth signaling, where the fifth signaling indicates a mapping relationship of the second domain to the link layer identity.

As an embodiment, when the node determined by the second target link layer identity is a node other than the first node, the first node sends a fifth MAC PDU, where the fifth MAC PDU includes at least part of non-padding bits in the second MAC SDU, and the fifth MAC PDU includes a fifth MAC sub-PDU, where the fifth MAC sub-PDU includes a fifth MAC sub-header, and the fifth MAC sub-header includes at least part of bits of the second target link layer identity.

As a sub-embodiment of this embodiment, the DST field of the fifth MAC subheader includes at least part of bits of the second target link layer identity.

As a sub-embodiment of this embodiment, the DST field of the fifth MAC subheader includes the 8 most significant bits of the second target link layer identity.

As an embodiment, when the second target link layer identity belongs to a second set of identities, the first node sends a sixth MAC PDU, the sixth MAC PDU including at least part of non-padding bits in the second MAC SDU, the sixth MAC PDU including a sixth MAC sub-PDU, the sixth MAC sub-PDU including a sixth MAC sub-header, the sixth MAC sub-header including at least part of bits of the second target link layer identity, the second set of identities being orthogonal to the first set of identities, the second set of identities not including the second link layer identity.

As a sub-embodiment of this embodiment, the DST field of the sixth MAC subheader includes at least part of bits of the second target link layer identity.

As a sub-embodiment of this embodiment, the DST field of the sixth MAC subheader includes the 8 most significant bits of the second target link layer identity.

For one embodiment, the second set of identities includes at least one link layer identity.

As an embodiment, the second set of identities is configured by a serving cell of the first node.

As an embodiment, the second set of identities is configured by the first node according to an internal algorithm.

As an embodiment, the target link layer identity belongs to the first set of identities and the second target link layer identity belongs to the second set of identities.

As an embodiment, the target link layer identity is a second link layer identity, the second target link layer identity belonging to the second set of identities.

As an example, the MAC PDU in fig. 7 is the first MAC PDU in this application.

As a sub-embodiment of the above embodiment, the first MAC PDU includes at least a first MAC sub-PDU.

As an example, the MAC PDU in fig. 7 is the second MAC PDU in this application.

As a sub-embodiment of the above embodiment, the second MAC PDU includes at least a second MAC sub-PDU.

As an embodiment, the MAC PDU in fig. 7 is MAC PDU 1 in embodiment 10 of the present application.

As an embodiment, the MAC PDU in fig. 7 is MAC PDU 2 in embodiment 10 of the present application.

As an embodiment, the MAC PDU in fig. 7 is MAC PDU 3 in embodiment 10 of the present application.

As an embodiment, the MAC PDU in fig. 7 is the MAC PDU 2a in embodiment 10 of the present application.

As an embodiment, the MAC PDU in fig. 7 is the MAC PDU 3a in embodiment 10 of the present application.

Example 8

Embodiment 8 illustrates a schematic diagram of multi-layer PDU processing according to an embodiment of the present invention, as shown in fig. 8; embodiment 8 further illustrates multi-level PDU processing based on embodiment 7.

For one embodiment, one PDCP PDU includes a PDCP header and a PDCP SDU.

As an embodiment, the contents of one PDCP header are related to the type of RB (radio bearer).

For one embodiment, the PDCP header of one SRB includes R, R, R, R and PDCP SN fields.

As an embodiment, the PDCP header of one DRB includes D/C, R and PDCP SN fields.

As an embodiment, one PDCP PDU optionally includes a MAC-I field.

As an embodiment, a header of a PDCP PDU carrying a PDCP status report includes D/C, PDU Type, R, R, and FMC fields.

As an embodiment, one PDCP SDU is Data (Data).

As an embodiment, one PDCP SDU is RRC signaling.

As an embodiment, one PDCP SDU is PC5-S signaling.

For one embodiment, one PDCP SDU is an SDAP PDU.

As an example, one PDCP SDU is an SDAP PDU carrying IP packets.

For one embodiment, one PDCP PDU is transmitted to the RLC entity via the interface between the PDCP and RLC entities, and one RLC SDU in fig. 7 includes one PDCP PDU.

As an embodiment, one PDCP PDU is transmitted to the RLC entity through an RLC bearer provided by the PDCP and RLC entities.

As an embodiment, one PDCP PDU is transmitted to the RLC layer.

For one embodiment, one PDCP PDU is sent to an RLC entity associated with the PDCP entity.

As an embodiment, one RLC PDU includes an RLC header and an RLC SDU.

As an embodiment, the RLC SDU is Data.

As an example, the contents of the RLC header are related to the mode of RLC, and the RLC header of a Transparent Mode (TMD) RLC PDU is empty.

As an example, the RLC PDU in fig. 8 corresponds to AM mode and UM mode.

As an embodiment, an RLC header of an UM Mode (UMD) RLC PDU includes an SI field and an SN field.

As an embodiment, the RLC header of one UMD RLC PDU includes one or more R fields.

For one embodiment, the RLC header of an AMD RLC PDU includes a D/C field, a P field, an SI field, and an SN field.

For one embodiment, the RLC header of an AMD RLC PDU includes one or more R fields.

As an embodiment, the RLC header of one status PDU includes a D/C field and a CPT field.

As an example, one RLC PDU carries data or control.

As an example, one RLC PDU carries data or STATUS PDU payload.

As an embodiment, one RLC PDU is mapped to the MAC layer through a logical channel interface.

As an embodiment, one RLC PDU is sent to the MAC layer.

As an embodiment, the MAC SDU of one MAC sub-PDU is one RLC PDU.

As an embodiment, the MAC SDU of one MAC sub-PDU is one MAC CE.

As an embodiment, one MAC PDU includes one MAC Header (Header) and at least one MAC sub-PDU (sub-PDU); the MAC header includes a source identity, a destination identity, and other bits.

As an embodiment, one MAC sub-PDU includes one MAC sub-header and one MAC SDU.

As an embodiment, the logical channel between the RLC layer and the MAC layer includes the SCCH and the STCH.

As an embodiment, the first field of the present application is carried by a MAC sub-PDU in fig. 8.

As an embodiment, the first field of the present application is carried by a MAC subheader in fig. 8.

As an embodiment, the first field of the present application is carried by an RLC PDU header in fig. 8.

As an embodiment, the first field of the present application is carried by a PDCP PDU header in fig. 8.

Example 9

Embodiment 9 illustrates a schematic diagram of mapping a first domain to a link layer identity and determining a target link layer identity according to one embodiment of the invention, as shown in fig. 9.

In embodiment 9, the first field is carried by a MAC PDU.

As an embodiment, the MAC PDU in fig. 9 includes a first MAC sub-PDU including a first MAC sub-header and a first MAC SDU.

For one embodiment, the first field is located in the first MAC subheader.

As an embodiment, the first field is located in an upper layer PDU header carried by the first MAC SDU.

As an embodiment, the first field is located in a header of an RLC PDU carried by the first MAC SDU.

As an embodiment, the logical channel identity indicated by the first MAC sub-PDU implicitly indicates the target link layer identity.

As an embodiment, the LCID field of the first MAC subheader is the first field.

As an embodiment, the first field is located in a header of a PDCP PDU carried by an RLC PDU carried by the first MAC SDU.

As an embodiment, there are R link layer identities in total, where R is a positive integer and the link layer identity (i-1) is one of the R link layer identities.

As a sub-embodiment of this embodiment, the link layer identity (i-1) is any one of the R link layer identities.

As an embodiment, the first domain is mapped to the link layer identity (i-1).

As an embodiment, the third signaling indicates a mapping relationship of the first domain to the R link layer identities.

As an embodiment, the link layer identity (i-1) is the second link layer identity.

As a sub-embodiment of this embodiment, the second link layer identity is determined to be the target link layer identity.

As an embodiment, the first set of identities comprises the link layer identity (i-1).

As a sub-embodiment of this embodiment, the link layer identity (i-1) is determined to be the target link layer identity, and the link layer identity (i-1) is a link layer identity other than the second link layer identity.

As an embodiment, the length of the LCID field included in the first MAC subheader is longer than the LCID field carried in the second MAC subheader.

As a sub-embodiment of this embodiment, the LCID field included in the first MAC subheader is 6 bits longer than the LCID field carried by the second MAC subheader.

As a sub-embodiment of this embodiment, the LCID field included in the first MAC subheader includes 12 bits; the LCID field carried by the second MAC subheader includes 6 bits.

As a sub-embodiment of this embodiment, the LCID field included in the first MAC subheader has a mapping relationship with 64 link layer identities, and R is equal to 64.

As a sub-embodiment of this embodiment, a modulo of 64 of a value of the LCID field included in the first MAC subheader is equal to a value of the LCID field of the second MAC subheader.

As a sub-embodiment of this embodiment, j is an integer part of a quotient of LCID field included in the first MAC subheader and 64, and there is a one-to-one mapping relationship between the LCID field and the link layer identity (j).

As an embodiment, the LCID field of the first MAC subheader is the first field, and a mapping relationship exists between part of bits of the LCID field and the R link layer identities.

As a sub-implementation of this embodiment, m is the number of bits of said part of bits of said LCID field, then said part of bits of said LCID field is mapped with at most 2^ m-1 link layer identities.

As an embodiment, the LCID field of the first MAC subheader is the first field, and when a value of the LCID field of the first MAC subheader is less than or equal to X, the first field is mapped to the second link layer identity; and when the value of the LCID domain of the first MAC subheader is greater than X and less than or equal to Y, the first domain is mapped to a link layer identity except the second link layer identity, wherein X and Y are both positive integers.

As an embodiment, the first field includes an LCID field of the first MAC subheader and at least one reserved bit of the first MAC subheader; when the value of the LCID domain of the first MAC subheader is in a first value set, the first domain and the second link layer identity are mapped; when the value of the LCID field of the first MAC subheader is outside the first value set, mapping the at least one reserved bit of the first MAC subheader with a link layer identity outside the second link layer identity, where the first value set includes a part of all LCID dereferenceable values.

As a sub-embodiment of this embodiment, the reserved bit indicates that the upper layer data carried by the first MAC PDU needs to be relayed.

As a sub-embodiment of this embodiment, the reserved bit indicates that the first field maps to a link layer identity other than the second link layer identity.

As a sub-embodiment of this embodiment, the reserved bit indicates that the first field maps to the second link layer identity.

As an embodiment, the sequence number of the upper layer PDU indicated by the first MAC SDU implicitly indicates the target link layer identity.

As a sub-embodiment of this embodiment, the sequence number of the upper layer PDU is an SN field included in a header of the upper layer PDU.

As a sub-embodiment of this embodiment, the sequence number of the upper layer PDU is a sequence number included in a header of the upper layer PDU.

As a sub-embodiment of this embodiment, the upper layer PDU includes an RLC PDU.

As a sub-embodiment of this embodiment, the upper layer PDUs include PDCP PDUs.

As a sub-embodiment of this embodiment, the upper layer PDU includes a message identity (RRC signaling).

As a sub-embodiment of this embodiment, the upper layer PDU includes a message identity (message identity) of the PC5-S signaling.

As a sub-embodiment of this embodiment, the upper layer PDU includes a sequence number of RRC signaling.

As a sub-embodiment of this embodiment, the upper layer PDU comprises a sequence number of the PC5-S signaling.

As an embodiment, the first field includes an SN field carried by a header of an RLC PDU included in the first MAC SDU.

As an embodiment, the first field includes partial bits of the first MAC subheader and partial bits of an upper layer PDU carried by the first MAC SDU.

As an embodiment, the first field includes partial bits of the first MAC subheader and partial bits of an upper layer SDU carried by the first MAC SDU.

As an embodiment, the sequence number of the upper layer SDU indicated by the first MAC SDU implicitly indicates the target link layer identity.

As a sub-embodiment of this embodiment, the upper layer SDU comprises an RLC SDU.

As a sub-embodiment of this embodiment, the upper layer SDUs include PDCP SDUs.

As an embodiment, the second set of identities includes the link layer identity (i-1), and the first set of identities does not include the link layer identity (i-1).

As an embodiment, the third signaling indicates a mapping relationship between a sequence number of an upper layer PDU carried by the first MAC sub-PDU and a link layer identity.

As an embodiment, the third signaling indicates a mapping relationship between a sequence number of an upper layer SDU carried in the first MAC sub-PDU and a link layer identity.

Example 10

Embodiment 10 illustrates a schematic diagram of communication between nodes according to an embodiment of the present invention, as shown in fig. 10.

As an example, the node a in fig. 10 corresponds to the second node of the present application, and the node B in fig. 10 corresponds to the first node of the present application.

As an embodiment, both node C and node D are UEs.

As one example, node a communicates with node B via PC 5.

As one example, node B communicates with node C via PC 5.

For one embodiment, node B communicates with node D via PC 5.

For one embodiment, node A sends MAC PDU 1 to node B.

As an embodiment, MAC PDU 1 in fig. 10 corresponds to a first MAC PDU of the present application, where the MAC PDU 1 includes a first MAC sub-PDU, the first MAC sub-PDU implicitly indicates a target link layer identity, and the target link layer identity indicated by the first MAC sub-PDU is the second link layer identity of the present application.

As a sub-embodiment of this embodiment, the first MAC sub-PDU includes a first MAC SDU, and the node B abandons transmission of a MAC PDU including non-padding bits included in the first MAC SDU.

For one embodiment, node A sends MAC PDU 2 to node B.

As an embodiment, a MAC PDU 2 in fig. 10 corresponds to a first MAC PDU of the present application, where the MAC PDU 2 includes a 20 th MAC sub-PDU, and the 20 th MAC sub-PDU implicitly indicates a 20 th link layer identity, and the 20 th link layer identity belongs to the first identity set of the present application.

As a sub-embodiment of this embodiment, the 20 th link layer identity indicated by the 20 th MAC sub-PDU determines node D in fig. 10.

As a sub-embodiment of this embodiment, the 20 th MAC sub-PDU does not include the 20 th link layer identity, and the 20 th MAC sub-PDU implicitly indicates the 20 th link layer identity.

As a sub-embodiment of this embodiment, the 20 th MAC sub-PDU corresponds to the first MAC sub-PDU of this application, and the 20 th link layer identity corresponds to the target link layer identity of this application.

As a sub-embodiment of this embodiment, the node B transmits a MAC PDU 2a, where the MAC PDU 2a includes a second MAC sub-PDU, and the second MAC sub-PDU includes a second MAC sub-header and a second MAC SDU; the MAC PDU 2a corresponds to the second MAC PDU of the present application; the second MAC SDU comprises at least part of data carried by the 20 th MAC SDU; the MAC PDU 2a includes the 20 th link layer identity.

For one embodiment, node A sends MAC PDU 3 to node B.

As an embodiment, the MAC PDU 3 in fig. 10 corresponds to a first MAC PDU of the present application, and the MAC PDU 3a corresponds to a second MAC PDU of the present application.

As a sub-embodiment of this embodiment, the MAC PDU 3 includes a 30 th MAC sub-PDU, the 30 th MAC sub-PDU includes a 30 th MAC sub-header and a 30 th MAC SDU, the 30 th MAC sub-PDU corresponds to the first MAC sub-PDU of this application, the 30 th MAC sub-PDU implicitly indicates a 30 th link layer identity, the 30 th link layer identity belongs to a second identity set, the second identity set includes at least one link layer identity, the second identity set is orthogonal to the first identity set, and the 30 th link layer identity determines node C.

As a sub-embodiment of this embodiment, a node B sends a MAC PDU 3a, where the MAC PDU 3a is generated by the MAC PDU 3, the MAC PDU 3a carries at least part of bits of data included in the 30 th MAC SDU, and the MAC PDU 3a includes the 30 th link layer identity.

As an embodiment, the MAC PDU 1, MAC PDU 2 and MAC PDU 3 multiplex the same unicast link.

As an embodiment, the MAC PDU 1, MAC PDU 2 and MAC PDU 3 multiplex the same layer2 link.

As an embodiment, the MAC PDU 1, MAC PDU 2 and MAC PDU 3 use different radio bearers.

As an embodiment, the MAC PDU 1 carries PC5-S signaling.

As an embodiment, the MAC PDU 1 carries PC5-RRC signaling.

As an embodiment, the MAC PDU 1 carries upper layer data.

As an embodiment, the MAC PDU 1 carries IP data.

As an embodiment, the MAC PDU 1 carries non-IP data.

As an embodiment, the MAC PDU 1 carries a MAC CE.

As an embodiment, the MAC PDU 1 carries an RLC control PDU.

As an embodiment, the MAC PDU 1 carries a PDCP control PDU.

As an embodiment, the MAC PDU 2 carries PC5-S signaling.

As an embodiment, the MAC PDU 2 carries PC5-RRC signaling.

As an embodiment, the MAC PDU 2 carries upper layer data.

As an embodiment, the MAC PDU 2 carries IP data.

As an embodiment, the MAC PDU 2 carries non-IP data.

As an embodiment, the MAC PDU 2 carries a MAC CE.

As an embodiment, the MAC PDU 2 carries an RLC control PDU.

As an embodiment, the MAC PDU 2 carries a PDCP control PDU.

As an embodiment, the MAC PDU 3 carries PC5-S signaling.

As an embodiment, the MAC PDU 3 carries PC5-RRC signaling.

As an embodiment, the MAC PDU 3 carries upper layer data.

As an embodiment, the MAC PDU 3 carries IP data.

As an embodiment, the MAC PDU 3 carries non-IP data.

As an embodiment, the MAC PDU 3 carries a MAC CE.

As an embodiment, the MAC PDU 3 carries an RLC control PDU.

As an embodiment, the MAC PDU 3 carries a PDCP control PDU.

Example 11

Embodiment 11 illustrates a block diagram of a processing apparatus for use in a first node according to an embodiment of the present application; as shown in fig. 11. In fig. 11, a processing means 1100 in a first node comprises a first receiver 1101 and a first transmitter 1102. In the case of the embodiment 11, however,

a first receiver 1101 that receives a first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least part of bits of a first link layer identity and at least part of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity;

when the target link layer identity belongs to a first identity set, the first transmitter 1102 transmitting a second MAC PDU, the second MAC PDU comprising a second MAC header and at least a second MAC sub-PDU, the second MAC sub-PDU comprising a second MAC sub-header, the second MAC sub-PDU comprising at least part of bits in the first MAC SDU, the second MAC header comprising at least part of bits of the target link layer identity;

when the target link layer identity is a second link layer identity, the first transmitter 1102 abandons sending a MAC PDU including at least part of bits in the first MAC SDU;

wherein the first set of identities comprises at least one link layer identity.

For one embodiment, the first receiver 1101 receives a first signaling, where the first signaling includes configuration information of the first MAC PDU;

the first transmitter 1102, when the second MAC PDU is transmitted, transmits a second signaling;

For an embodiment, the first receiver 1101 receives a third signaling, where the third signaling indicates a mapping relationship of a first domain to a link layer identity;

wherein the target link layer identity is determined by the first domain in the first MAC sub-PDU according to the first domain to link layer identity mapping relationship.

As an embodiment, the first node is a User Equipment (UE).

As an embodiment, the first node is a terminal supporting a large delay difference.

As an embodiment, the first node is a terminal supporting NTN.

As an embodiment, the first node is an aircraft.

As an embodiment, the first node is a vehicle-mounted terminal.

As an embodiment, the first node is a relay.

As an embodiment, the first node is a ship.

As an embodiment, the first node is an internet of things terminal.

As an embodiment, the first node is a terminal of an industrial internet of things.

As an embodiment, the first node is a device supporting low-latency high-reliability transmission.

For one embodiment, the first receiver 1101 includes at least one of the antenna 452, the receiver 454, the receive processor 456, the multiple antenna receive processor 458, the controller/processor 459, the memory 460, or the data source 467 of embodiment 4.

For one embodiment, the first transmitter 1102 includes at least one of the antenna 452, the transmitter 454, the transmit processor 468, the multi-antenna transmit processor 457, the controller/processor 459, the memory 460, or the data source 467 of embodiment 4.

Example 12

Embodiment 12 illustrates a block diagram of a processing apparatus for use in a second node according to an embodiment of the present application; as shown in fig. 12. In fig. 12, the processing means 1200 in the first node comprises a second transmitter 1201. In the case of the embodiment 12, however,

a second transmitter 1201 transmitting a first MAC PDU comprising a first MAC header and at least a first MAC sub-PDU, the first MAC header comprising at least part of bits of a first link layer identity and at least part of bits of a second link layer identity; the first MAC sub-PDU comprises a first MAC sub-head and a first MAC SDU, and the first MAC sub-PDU implicitly indicates a target link layer identity;

wherein the first set of identities comprises at least one link layer identity.

For an embodiment, the second transmitter 1201 transmits a first signaling, where the first signaling includes configuration information of the first MAC PDU; when the second MAC PDU is transmitted, second signaling is transmitted;

As an embodiment, the second transmitter 1201 sends a third signaling, where the third signaling indicates a mapping relationship from the first domain to the link layer identity; wherein the target link layer identity is determined by the first domain in the first MAC sub-PDU according to a mapping relationship of the first domain to link layer identity.

As an embodiment, the second node is a User Equipment (UE).

As an embodiment, the second node is a terminal supporting a large delay difference.

As an embodiment, the second node is a terminal supporting NTN.

As an embodiment, the second node is an aircraft.

As an embodiment, the second node is a vehicle-mounted terminal.

As an embodiment, the second node is a relay.

As an embodiment, the second node is a ship.

As an embodiment, the second node is an internet of things terminal.

As an embodiment, the second node is a terminal of an industrial internet of things.

As an embodiment, the second node is a device supporting low-latency high-reliability transmission.

For one embodiment, the second transmitter 1201 includes at least one of the antenna 420, the transmitter 418, the transmit processor 416, the multi-antenna transmit processor 471, the controller/processor 475, and the memory 476 of embodiment 4.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware. User equipment, terminal and UE in this application include but not limited to unmanned aerial vehicle, Communication module on the unmanned aerial vehicle, remote control aircraft, the aircraft, small aircraft, the cell-phone, the panel computer, the notebook, vehicle Communication equipment, wireless sensor, network card, thing networking terminal, the RFID terminal, NB-IoT terminal, MTC (Machine Type Communication) terminal, eMTC (enhanced MTC) terminal, the data card, network card, vehicle Communication equipment, low-cost cell-phone, low-cost panel computer, satellite Communication equipment, ship Communication equipment, wireless Communication equipment such as NTN user equipment. The base station or the system device in the present application includes, but is not limited to, a macro cell base station, a micro cell base station, a home base station, a relay base station, a gNB (NR node B) NR node B, a TRP (Transmitter Receiver Point), an NTN base station, a satellite device, a flight platform device, and other wireless communication devices.

The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A first node for wireless communication, comprising:

wherein the first set of identities comprises at least one link layer identity.

2. The first node of claim 1, comprising:

the first receiver receives a first signaling, wherein the first signaling comprises configuration information of the first MAC PDU;

the first transmitter, when the second MAC PDU is transmitted, transmitting a second signaling;

3. The first node according to claim 1 or 2, comprising:

the first receiver receives a third signaling, wherein the third signaling indicates the mapping relation from the first domain to the link layer identity;

wherein the target link layer identity is determined by the first domain in the first MAC sub-PDU according to a mapping relationship of the first domain to link layer identity.

4. The first node according to any of claims 1-3, wherein the logical channel identity indicated by the first MAC sub-PDU implicitly indicates the target link layer identity.

5. The first node according to any of claims 1-3, wherein the target link layer identity is implicitly indicated by a sequence number of an upper layer PDU indicated by the first MAC SDU.

6. The first node according to any of claims 1-5, wherein the second MAC header comprises at least part of bits of a third link-layer identity, the third link-layer identity being implicitly indicated by the first MAC sub-PDU; the third link layer identity is different from the target link layer identity.

7. The first node according to any of claims 1-6, wherein the first MAC PDU comprises a second MAC sub-PDU implicitly indicating a second target link-layer identity; the second target link layer identity is an identity other than the target link layer identity; only one of the target link layer identity and the second target link layer identity belongs to the first set of identities.

8. A second node for wireless communication, comprising:

wherein the first set of identities comprises at least one link layer identity.

9. A method in a first node for wireless communication, comprising:

wherein the first set of identities comprises at least one link layer identity.

10. A method in a second node for wireless communication, comprising:

wherein the first set of identities comprises at least one link layer identity.