CN117395629A

CN117395629A - Method and device for relay transmission

Info

Publication number: CN117395629A
Application number: CN202311496741.9A
Authority: CN
Inventors: 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2024-01-12
Also published as: CN114205774A

Abstract

The invention discloses a method and a device for relay transmission. The method comprises the steps that a first node receives a first message set through an air interface, wherein the first message set comprises at least one state message; transmitting the first information unit over an air interface; wherein each of the status messages in the first set of messages indicates that one set of data units is received, the one set of data units comprising at least one data unit; the first information unit indicates a reception status of the first node and a first set of data units, the reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the first node. The method and the device can reduce air interface overhead and delay and improve transmission robustness.

Description

Method and device for relay transmission

This application is a divisional application of the following original applications:

filing date of the original application: 2020, 09, 02 days

Number of the original application: 202010910240.0

-the name of the invention of the original application: method and device for relay transmission

Technical Field

The present application relates to methods and apparatus in a wireless communication system, and more particularly, to schemes and apparatus for supporting relay transmissions in a wireless communication system.

Background

Relay communication is a common method in cellular network communication, where data from a source node is forwarded by a relay node to a remote node. The source node and the remote node are typically base station equipment and user equipment, and may also be both user equipment; the relay node may be a network device or a user equipment. Common relay communications include layer 1 relays, which forward information bits recovered at the physical layer, and layer 2 relays, which forward information bits recovered at layer 2.

D2D (Device to Device) or V2X (Vehicle to everything, vehicle to outside) is an important application scenario in cellular communication, and direct communication between two communication terminals can be achieved. In both the 3GPP (3 rd Generation Partner Project, third Generation partnership project) 4G and 5G standards, D2D/V2X was introduced.

Disclosure of Invention

The inventors have found through research that if the source node determines whether to retransmit PDCP (Packet Data Convergence Protocol ) SDUs (service Data Unit, service data units) or RLC (Radio Link Control ) SDUs based on a higher layer ACK/NACK indication fed back by the remote node, one potential problem is that there may be data at the relay node that has not yet been transmitted, thus resulting in unnecessary retransmission of the source node's data.

In view of the above, the present application discloses a solution. It should be noted that, although in some embodiments of the present application, the source node, the relay node, and the remote node are all user equipments; the method and the device are also applicable to relay transmission with network equipment participation facing similar problems, for example, the source node is base station equipment, or the relay node is base station equipment, or the remote node is base station equipment, and similar technical effects are achieved. Furthermore, the adoption of a unified solution for different scenarios (including but not limited to V2X, upstream communication, downstream communication, etc.) also helps to reduce hardware complexity and cost. Embodiments and features of embodiments in any node of the present application may be applied to any other node without conflict. The embodiments of the present application and features in the embodiments 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 set of messages over an air interface, the first set of messages including at least one status message therein;

transmitting the first information unit over an air interface;

Wherein each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; the first information unit indicates a reception status of the first node and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the first node; the sender of any status message in the first set of messages is non-co-located with the target recipient of the first information unit.

As an embodiment, in the above method, the first node indicates, through the first information unit, the first set of data units that have not been received correctly but may be retransmitted by the relay node, and the source node can select data suitable for retransmission according to the first information unit.

Specifically, according to one aspect of the present application, the method includes:

transmitting a second information element over the air interface;

monitoring a second set of data units over the air interface;

wherein the second information unit is used to trigger transmission of the second set of data units; the receiver of the first information unit is not co-located with a target receiver of the second information unit, and the sender of the second set of data units is not co-located with the receiver of the first information unit.

As an embodiment, the first node triggers the second information unit to send the second data unit set through the method, so as to reduce transmission delay.

selecting the receiver of the second information unit from Q1 candidates;

wherein the first message set includes Q1 status messages, the Q1 status messages are sent by the Q1 candidates respectively, the one data unit set indicated by the Q1 status messages includes the second data unit set, and the Q1 is a positive integer greater than 1.

As an embodiment, when there are multiple relay nodes, the first node improves the quality of the relay transmission by selecting the target receiver of the appropriate second information unit, thereby improving the transmission efficiency.

As an embodiment, the channel quality of said receiver of said second information unit to said first node is the best of the channel qualities of said Q1 candidates to said first node.

As an embodiment, the channel quality comprises RSRP (Reference Signal Receiving Power, reference signal received power).

As an embodiment, the channel quality comprises RSRQ (Reference Signal Receiving Quality, reference signal received quality).

As an embodiment, the channel quality comprises SINR (Signal to Interference Noise Ratio, signal to interference plus noise ratio).

if any data unit in the second set of data units is not received within the first time window, clearing the third identity from the first identity list; and receiving the data of the data source identified by any identity in the first identity list.

As an embodiment, the sender of said second set of data units is identified by said third identity.

As one embodiment, if any one of the second set of data units fails to be received within the first time window, the first node determines that the connection between the communication node of the third identity to the first node fails.

As an embodiment, if any one of the second set of data units fails to be received within the first time window, the first node still maintains a first radio bearer over which the first set of data units is transmitted.

As an embodiment, the method can help the first node to rapidly switch the relay route, reduce delay and improve transmission robustness.

Specifically, according to an aspect of the present application, the receiving state of the first node includes a third set of data units received by the first node, and any data unit in the first set of data units does not belong to the third set of data units.

As an embodiment, the above method can enable the source node (or relay node) to free up storage space for said third data unit.

receiving a data unit over a first radio bearer;

wherein the first set of messages and the first information element are both for the first radio bearer.

In particular, according to an aspect of the present application, the first information unit is used by the intended recipient of the first information unit to determine not to retransmit the first set of data units and not to free up storage space for the first set of data units.

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

Receiving a first information element over an air interface;

wherein the first information unit indicates a reception status of a sender of the first information unit and a first set of data units, reception of each data unit in the first set of data units being indicated by a first set of messages, any data unit in the first set of data units not yet being received by the sender of the first information unit; the first set of messages includes at least one status message, each of the status messages in the first set of messages indicating that one set of data units is obtained, the one set of data units including at least one data unit; the sender of any status message in the first set of messages is non-co-located with the second node; the first set of messages is sent over an air interface.

transmitting the data unit over the first radio bearer;

As an embodiment, the second node determines how the retransmitted data units are implementation dependent (i.e. do not need to be standardized, determined by the respective vendor itself) based on the first information units.

and determining not to retransmit the first data unit set and not to release the storage space of the first data unit set according to the first information unit.

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

transmitting a first status message over an air interface; the first status message is one status message in a first set of messages;

wherein each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; a first information unit indicating a reception status of a target recipient of the first status message and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the recipient of the first status message; the first information element air interface is transmitted, and a sender of any status message in the first set of messages is not co-located with a target recipient of the first information element.

receiving a second information element over the air interface;

transmitting the second set of data units over the air interface;

wherein the second information unit is used to trigger transmission of the second set of data units; the receiver of the first information unit is not co-located with the third node and the sender of the second information unit is not co-located with the receiver of the first information unit.

the first receiver receives data units through a first radio bearer;

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

a first receiver for receiving a first set of messages over an air interface, the first set of messages including at least one status message therein;

A first transmitter for transmitting a first information unit over an air interface;

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

a second receiver for receiving the first information unit over the air interface;

The application discloses a third node for wireless communication, comprising:

a third transmitter for transmitting the first status message over the air interface; the first status message is one status message in a first set of messages;

Drawings

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

Fig. 1 shows a transmission flow diagram of a first node according to an embodiment of the present application;

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

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

FIG. 4 illustrates a hardware block diagram of a communication node according to one embodiment of the present application;

FIG. 5 illustrates a transmission flow diagram between a first node, a second node, and a third node according to one embodiment of the present application;

FIG. 6 illustrates a flowchart of maintaining a first identity list according to one embodiment of the present application;

FIG. 7 illustrates a schematic diagram of a protocol architecture for relay transmission according to one embodiment of the present application;

FIG. 8 illustrates a schematic diagram of an identity according to one embodiment of the present application;

FIG. 9 illustrates yet another schematic diagram of an identity according to one embodiment of the present application;

fig. 10 shows a schematic diagram of one MAC (Media Access Control, medium access control) PDU (Protocol Data Unit ) according to one embodiment of the present application;

fig. 11 shows a schematic diagram of a plurality of relay nodes according to an embodiment of the present application;

FIG. 12 illustrates a block diagram of a processing device for use in a first node according to one embodiment of the present application;

FIG. 13 shows a block diagram of a processing apparatus for use in a second node according to one embodiment of the present application;

FIG. 14 shows a block diagram of a processing arrangement for use in a third node according to one embodiment of the present application;

fig. 15 illustrates a block diagram of control signaling according to one embodiment of the present application.

Detailed Description

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

Example 1

Embodiment 1 illustrates a transmission flow diagram of a first node according to one embodiment of the present application, as shown in fig. 1.

In embodiment 1, a first node 100 receives a first set of messages over an air interface in step 101, the first set of messages including at least one status message therein; the first information unit is transmitted over the air interface in step 102.

In embodiment 1, each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; the first information unit indicates a reception status of the first node and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the first node; the sender of any status message in the first set of messages is non-co-located with the target recipient of the first information unit.

As an embodiment, any data unit indicated by the first set of messages is transmitted over a first radio bearer.

As an embodiment, any data unit of the first set of data units is transmitted over a first radio bearer.

As an embodiment, the air interface comprises an interface for wireless signal transmission.

The air interface, as one embodiment, comprises a PC5 interface.

As an embodiment, the air interface comprises a Uu interface.

As an embodiment, the second node is the target recipient of the first information unit.

As an embodiment, the first node and the second node maintain one PDCP (Packet Data Convergence Protocol ) entity (entity) of the first radio bearer, respectively.

As an embodiment, the first node and the second node each maintain one RLC (Radio Link Control ) entity of the first radio bearer.

As an embodiment, the target recipient of a message refers to: the one message is received over the air interface and is no longer forwarded over the air interface.

As an embodiment, the target recipient of a message refers to: the one message is received over the air interface and passed to the RLC layer.

As an embodiment, the target recipient of a message refers to: receiving one MAC PDU through an air interface, and transferring data carried in the one MAC PDU to a NAS (Non-Access Stratum); the one message is carried in the one MAC PDU.

As an embodiment, the one message belongs to one SDU (service Data Unit ) in the one MAC PDU.

As an embodiment, the target recipient of a message refers to: the one message is received over the air interface and delivered to the PDCP layer.

As one embodiment, the first set of messages includes Q1 status messages, the Q1 being a positive integer greater than 1; the Q1 status messages are sent by Q1 communication nodes, respectively.

As one example, Q1 is no greater than 2048.

As an embodiment, the Q1 is the number of UEs (User Equipment) participating in the relay of the first radio bearer.

As an embodiment, the data unit includes one RLC SDU.

As an embodiment, the data unit includes at least one RLC SDU Segment (Segment).

As an embodiment, the first information unit comprises a control PDU of an RLC sublayer, and the data unit comprises an RLC SDU or an RLC SDU fragment.

As a sub-embodiment of the above embodiment, each of the status messages in the first set of messages comprises a control PDU of an RLC sublayer.

As an embodiment, the control PDU of the one RLC sublayer includes Status PDU.

As an embodiment, the data unit includes one PDCP SDU.

As an embodiment, the first information unit is a control PDU of one PDCP sublayer, and the data unit includes one PDCP SDU.

As a sub-embodiment of the above embodiment, each of the status messages in the first message set includes a control PDU of one PDCP sublayer.

As an embodiment, the control PDU of the one PDCP sublayer is used for PDCP status report (status report).

As an embodiment, the data unit comprises one MAC SDU.

As a sub-embodiment of the above embodiment, the first information Element is a MAC CE (Control Element).

As an embodiment, the reception status of the first node comprises at least one lost (lost) data unit.

As an embodiment, any data unit of the first set of data units has not been received by the first node.

As an embodiment, the reception status of the first node comprises data units that have been received by the first node.

As an embodiment, the first node 100 is a user equipment.

As an embodiment, the first node 100 is a base station device.

As a sub-embodiment of the above embodiment, the physical layer channel occupied by the data unit includes a PSSCH (Physical Sidelink Shared CHannel ).

As a sub-embodiment of the above embodiment, the transport channel occupied by the data unit includes a SL-SCH (SideLink Shared CHannel ).

Example 2

Embodiment 2 illustrates a schematic diagram of a network architecture according to one embodiment of the present application, as shown in fig. 2. Fig. 2 illustrates V2X communication architecture under 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 ) 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, evolved packet core) 210, hss (Home Subscriber Server )/UDM (Unified Data Management, unified data management) 220, proSe function 250, and ProSe application server 230. The V2X communication architecture may be interconnected 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 bs (gnbs) 203 and other gnbs 204. The gNB203 provides user and control plane protocol termination towards the UE 201. The gNB203 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 (transmit receive node), or some other suitable terminology. The gNB203 provides the UE201 with an access point to the 5GC/EPC210. Examples of UE201 include a cellular telephone, 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, an drone, an aircraft, a narrowband internet of things device, a machine-type communication device, a land-based vehicle, an automobile, a wearable device, or any other similar functional device. Those of skill in the art may also refer to the 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. gNB203 is connected to 5GC/EPC210 through an S1/NG interface. The 5GC/EPC210 includes MME (Mobility Management Entity )/AMF (Authentication Management Field, authentication management domain)/SMF (Session Management Function ) 211, other MME/AMF/SMF214, S-GW (Service Gateway)/UPF (userplaneflection) 212, and P-GW (Packet Date Network Gateway, packet data network Gateway)/UPF 213. The MME/AMF/SMF211 is a control node that handles signaling between the UE201 and the 5GC/EPC210. In general, the MME/AMF/SMF211 provides bearer and connection management. All user IP (Internet Protocal, internet protocol) packets are transported through the S-GW/UPF212, which S-GW/UPF212 itself is connected to the P-GW/UPF213. The P-GW provides UE IP address assignment as well as other functions. The P-GW/UPF213 is connected to the internet service 230. Internet services 230 include operator-corresponding internet protocol services, which may include, in particular, the internet, intranets, IMS (IP Multimedia Subsystem ) and packet-switched streaming services. The ProSe function 250 is a logic function for network related behavior required for a ProSe (Proximity-based Service); including DPF (Direct Provisioning Function, direct provision function), direct discovery name management function (Direct Discovery Name Management Function), 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 user identities, mapping between application layer user identities and EPC ProSe user identities, allocating ProSe-restricted code suffix pools, etc.

As an embodiment, the UE201 and the UE241 are connected through a PC5 Reference Point (Reference Point).

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

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

As an embodiment, the ProSe application server 230 is connected to the ProSe application of the UE201 and the ProSe application of the UE241 via PC1 reference points, respectively.

As an embodiment, the first node, the second node, and the third node in the present application are NR node B, UE and UE241, respectively.

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

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

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

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

As an embodiment, the radio link from the UE201 to the NR node B is an uplink.

As an embodiment, the radio link from the NR node B to the UE201 is a downlink.

As an embodiment, the UE201 supports relay transmission.

As an embodiment, the UE241 supports relay transmission.

As an embodiment, the gNB203 is a macro cell (marcocelluar) base station.

As one example, the gNB203 is a Micro Cell (Micro Cell) base station.

As an embodiment, the gNB203 is a PicoCell (PicoCell) base station.

As an embodiment, the gNB203 is a flying platform device.

As one embodiment, the gNB203 is a satellite device.

Example 3

Embodiment 3 illustrates a schematic diagram of an embodiment of a wireless protocol architecture according to one user plane and control plane of 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 shows the radio protocol architecture for the control plane 300 between a first node and a second node, or a first node and a third node, or a second node and a third node, or two UEs, in three layers: layer 1, layer 2 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 PHY301. Layer 2 (L2 layer) 305 is above PHY301 and is responsible for the link between the first node and the second node, or the first node and the third node, or both UEs, through PHY301. The L2 layer 305 includes a MAC (Medium Access Control ) sublayer 302, an RLC (Radio Link Control, radio link layer control protocol) sublayer 303, and a PDCP (Packet Data Convergence Protocol ) sublayer 304, which terminate at the second node (or third node). The PDCP sublayer 304 provides data ciphering and integrity protection; for the Uu interface, the PDCP sublayer 304 also provides handover support. The RLC sublayer 303 provides segmentation and reassembly of data packets, retransmission of lost data packets by ARQ, and RLC sublayer 303 also provides duplicate data packet detection and protocol error detection. The MAC sublayer 302 provides mapping between logical and transport channels and multiplexing of logical channels. For the Uu interface, the MAC sublayer 302 is also responsible for allocating the various radio resources (e.g., resource blocks) in one cell among the first nodes. The MAC sublayer 302 is also responsible for HARQ (Hybrid Automatic Repeat Request ) operations. The RRC sub-layer 306 in layer 3 (L3 layer) in the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling. The radio protocol architecture of the user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer), and the radio protocol architecture for the first node and the second node (or third node) in the user plane 350 is substantially the same for the physical layer 351, PDCP sublayer 354 in the L2 layer 355, RLC sublayer 353 in the L2 layer 355, and 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 the upper layer data packets to reduce wireless transmission overhead. Also included in the L2 layer 355 in the user plane 350 is an SDAP (Service Data Adaptation Protocol ) sublayer 356, the SDAP sublayer 356 being responsible for mapping between QoS (Qualityof Service ) flows and data radio bearers (DRBs, data Radio Bearer) to support diversity of traffic. Although not shown, the first node may have several upper layers above the L2 layer 355, including 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., remote UE, server, etc.).

As an example, the entities of the multiple sublayers of the control plane in fig. 3 constitute SRBs in the vertical direction (Signaling Radio Bear, signaling radio bearers).

As an example, entities of a plurality of sublayers of the control plane in fig. 3 constitute a DRB (Data Radio bearer) in a vertical direction.

As an embodiment, the first radio bearer in the present application is an SRB.

As an embodiment, the first radio bearer in the present application is a DRB.

As an embodiment, each status message in the first set of messages and the first information element in the present application are generated in the MAC302.

As an embodiment, each status message in the first set of messages and the first information element in the present application is generated in the RLC303.

As an embodiment of the foregoing embodiment, the data unit in the present application is generated in the RLC303.

As an embodiment of the above embodiment, the second information unit in the present application is generated in the RLC303.

As an embodiment, each status message in the first set of messages and the first information element in the present application is generated in the PDCP304.

As an embodiment of the foregoing embodiment, the data unit in the present application is generated in the PDCP 304.

As an embodiment of the foregoing embodiment, the second information element in the present application is generated in the PDCP 304.

As an embodiment, each status message in the first set of messages and the first information element in the present application is generated in the RLC 353.

As an embodiment of the above embodiments, the data unit in the present application is generated in the RLC 353.

As an embodiment of the above embodiments, the second information element in the present application is generated in the RLC 353.

As an embodiment, each status message in the first set of messages and the first information element in the present application is generated in the PDCP 354.

As an embodiment of the foregoing embodiments, the data unit in the present application is generated in the PDCP 354.

As an embodiment of the foregoing embodiment, the second information element in the present application is generated in the PDCP 354.

As an embodiment, the physical layer signaling in the present application is generated in the PHY301 or the PHY351.

As an embodiment, the data plane of the first node and the third node in the present application only needs to maintain the connection of the PHY layer and the MAC sublayer; the data plane of the second node and the third node in the present application only needs to maintain the connection of the PHY layer and the MAC sublayer.

As an embodiment, the data plane of the first node and the third node in the present application only needs to maintain the connection of the PHY layer, the MAC sublayer and the RLC sublayer; the data plane of the second node in this application and the third node in this application only needs to maintain the connection of the PHY layer, the MAC sublayer and the RLC sublayer.

As an embodiment, the first node in the present application and the third node in the present application do not need to maintain a connection of the control plane.

As an embodiment, the second node in the present application and the third node in the present application do not need to maintain a connection of the control plane.

Some of the embodiments described above avoid the increase in signaling overhead caused by the third node establishing/maintaining a higher layer connection; furthermore, the embodiment can realize that the third node can quickly join and exit the relay operation, thereby reducing delay and improving transmission robustness.

Example 4

Embodiment 4 shows a schematic diagram of hardware modules of a communication node according to an embodiment of 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 communication 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 multi-antenna receive processor 472, a multi-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, upper layer data packets from the core network are provided to a controller/processor 475 at the second communication device 410. The controller/processor 475 implements the functionality of the L2 layer. In the transmission from the second communication device 410 to the first communication device 450, a controller/processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication 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., physical layer). Transmit processor 416 performs coding and interleaving to facilitate Forward Error Correction (FEC) at the second communication device 410, as well as mapping of signal clusters 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 digitally space-precodes the coded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. A transmit processor 416 then maps each spatial stream to a subcarrier, 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 a physical channel carrying the time domain multicarrier symbol stream. 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 multiple antenna transmit processor 471 to a radio frequency stream and then provides it to a different antenna 420.

In a transmission from the second communication device 410 to the first communication device 450, each receiver 454 receives a signal at the first communication device 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 multicarrier symbol stream that is provided to a receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 implement various signal processing functions for 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. The receive processor 456 converts the baseband multicarrier symbol stream after receiving the 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 signal and the reference signal are demultiplexed by the receive processor 456, wherein the reference signal is to be used for channel estimation, and the data signal is subjected to multi-antenna detection in the multi-antenna receive processor 458 to recover any spatial stream destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered in 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 that were transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller/processor 459. The controller/processor 459 implements the functions 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 the transmission from the second communication device 410 to the second node 450, the controller/processor 459 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover upper layer data packets from the core network. The upper layer packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to L3 for L3 processing.

In the transmission from the first communication device 450 to the second communication device 410, a data source 467 is used at the first communication 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 transmit functions at the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller/processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocations, implementing L2 layer functions for the user and control planes. The controller/processor 459 is also responsible for retransmission of lost packets and signaling to the second communication device 410. The transmit processor 468 performs modulation mapping, channel coding, and digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming, with the multi-antenna transmit processor 457 performing digital multi-antenna spatial precoding, after which the transmit processor 468 modulates the resulting spatial stream into a multi-carrier/single-carrier symbol stream, which is analog precoded/beamformed in the multi-antenna transmit processor 457 before being provided to the different antennas 452 via the transmitter 454. 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 it to an antenna 452.

In the transmission from the first communication device 450 to the second communication device 410, the function at the second communication device 410 is similar to the receiving function 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 corresponding 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 multi-antenna receive processor 472 collectively implement the functions of the L1 layer. The controller/processor 475 implements L2 layer functions. The controller/processor 475 may be associated with a memory 476 that stores program codes and data. Memory 476 may be referred to as a computer-readable medium. In the transmission from the first communication device 450 to the second communication device 410, a controller/processor 475 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover upper layer data packets from the UE 450. Upper layer packets from the controller/processor 475 may be provided to the 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 are configured to, with the at least one processor, cause the apparatus of the first communication device 450 to at least: receiving a first set of messages over an air interface, the first set of messages including at least one status message therein; transmitting the first information unit over an air interface; wherein each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; the first information unit indicates a reception status of the first node and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the first node; the sender of any status message in the first set of messages is non-co-located with the target recipient of the first information unit.

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, produce acts comprising: receiving a first set of messages over an air interface, the first set of messages including at least one status message therein; transmitting the first information unit over an air interface; wherein each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; the first information unit indicates a reception status of the first node and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the first node; the sender of any status message in the first set of messages is non-co-located with the target recipient of the first information unit.

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 status message over an air interface; the first status message is one status message in a first set of messages; wherein each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; a first information unit indicating a reception status of a target recipient of the first status message and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the recipient of the first status message; the first information element air interface is transmitted, and a sender of any status message in the first set of messages is not co-located with a target recipient of the first information element.

As an embodiment, the second communication device 410 apparatus includes: a memory storing a program of computer-readable instructions that, when executed by at least one processor, produce acts comprising: transmitting a first status message over an air interface; the first status message is one status message in a first set of messages; wherein each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; a first information unit indicating a reception status of a target recipient of the first status message and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the recipient of the first status message; the first information element air interface is transmitted, and a sender of any status message in the first set of messages is not co-located with a target recipient of the first information element.

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: receiving a first information element over an air interface; wherein the first information unit indicates a reception status of a sender of the first information unit and a first set of data units, reception of each data unit in the first set of data units being indicated by a first set of messages, any data unit in the first set of data units not yet being received by the sender of the first information unit; the first set of messages includes at least one status message, each of the status messages in the first set of messages indicating that one set of data units is obtained, the one set of data units including at least one data unit; the sender of any status message in the first set of messages is non-co-located with the second node; the first set of messages is sent over an air interface.

As an embodiment, the second communication device 410 apparatus includes: a memory storing a program of computer-readable instructions that, when executed by at least one processor, produce acts comprising: receiving a first information element over an air interface; wherein the first information unit indicates a reception status of a sender of the first information unit and a first set of data units, reception of each data unit in the first set of data units being indicated by a first set of messages, any data unit in the first set of data units not yet being received by the sender of the first information unit; the first set of messages includes at least one status message, each of the status messages in the first set of messages indicating that one set of data units is obtained, the one set of data units including at least one data unit; the sender of any status message in the first set of messages is non-co-located with the second node; the first set of messages is sent over an air interface.

As an embodiment, the first communication device 450 corresponds to a first node in the present application; the second communication device 410 corresponds to a second node in the present application.

As an embodiment, the first communication device 450 corresponds to a third node in the present application; the second communication device 410 corresponds to a first node in the present application.

As an embodiment, the first communication device 450 corresponds to a second node in the present application; the second communication device 410 corresponds to a first node in the present application.

As an embodiment, the first communication device 450 corresponds to a second node in the present application; the second communication device 410 corresponds to a third node in the present application.

As an embodiment, the first communication device 450 is a UE.

As an embodiment, the second communication device 410 is a UE.

Example 5

Embodiment 5 illustrates a transmission flow diagram between a first node, a second node, and a third node according to one embodiment of the present application, as shown in fig. 5. In fig. 5, the steps in blocks F1, F2 and F3 are optional, respectively.

For the followingFirst node U1Receiving a data unit over a first radio bearer in step S100; receiving a first set of messages over an air interface in step S101, the first set of messages including at least one status message therein; transmitting a first information unit over an air interface in step S102; transmitting a second information element over the air interface in step S103; monitoring a second set of data units over the air interface in step S104;

For the followingSecond node U2The number of transmissions over the first radio bearer in step S200A data unit; receiving a first information unit over an air interface in step S201; determining in step S202 that the first set of data units is not retransmitted and that the storage space of the first set of data units is not freed up from the first information unit; transmitting the data unit over the first radio bearer in step S203;

for the followingThird node U3Receiving a data unit over a first radio bearer in step S300; transmitting a first status message over the air interface in step S301, the first status message being one of a first set of messages; receiving the second information unit over an air interface in step S302; transmitting a second set of data units over the air interface in step S303;

in embodiment 5, each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; the first information unit indicates a reception status of the first node and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the first node; the sender of any status message in the first set of messages is not co-located with the target receiver of the first information unit, i.e. the second node U2; the first set of messages and the first information element are both for the first radio bearer; the second information unit is used to trigger the transmission of the second set of data units; the receiver of the first information unit is not co-located with a target receiver of the second information unit, and the sender of the second set of data units is not co-located with the receiver of the first information unit.

As an embodiment, the first set of messages and the first information element are both for the first radio bearer.

As an embodiment, the first field in the MAC PDU for carrying any one of the second set of data units and the second field in the corresponding physical layer scheduling signaling each comprise part of bits of a first identity, the first identity identifying the destination.

As an embodiment, the third field in the MAC PDU for carrying any one of the second set of data units and the fourth field in the corresponding physical layer scheduling signaling each comprise part of bits of a third identity, the second identity identifying the data source.

As an embodiment, the first field in the MAC PDU for the first transmission of any data unit indicated by the first message set and the second field in the corresponding physical layer scheduling signaling each comprise part of bits of a first identity, which identifies the destination.

As an embodiment, the third field in the MAC PDU for the first transmission of any data unit indicated by the first message set and the fourth field in the corresponding physical layer scheduling signaling each include a portion of bits of a second identity, where the second identity identifies the data source.

As an embodiment, the first field in the MAC PDU for carrying any one of the first set of data units and the second field in the corresponding physical layer scheduling signaling each comprise part of bits of a first identity, the first identity identifying the destination.

As an embodiment, the first identity identifies the first node U1.

As an embodiment, the third field in the MAC PDU for carrying any one of the first set of data units and the fourth field in the corresponding physical layer scheduling signaling each comprise part of bits of a second identity, which identifies the data source.

As an embodiment, the second identity identifies the second node U2.

As an embodiment, the third identity identifies a third node U3.

As an embodiment, the names of the first and second domains are DST and Destination ID, respectively.

As an embodiment, the first and second fields comprise 8 bits and 16 bits, respectively.

As an embodiment, the names of the third and fourth domains are SRC and Source IDs, respectively.

As an embodiment, the first and second fields comprise 16 bits and 8 bits, respectively.

As an embodiment, the first identity and the second identity indicate two different UEs (User Equipment).

As an embodiment, the first identity, the second identity and the third identity each comprise 24 bits.

As an embodiment, the first identity, the second identity and the third identity identify the first node U1, the second node U2 and the third node U3, respectively, in the present application.

As an embodiment, the first identity, the second identity and the third identity are each one link layer identity.

As an embodiment, the scheduling information includes a CSI (Channel Status Information, channel state information) request.

As an embodiment, the physical layer signaling includes SCI (Sidelink Control Information ).

As an embodiment, the physical layer signaling includes SCI format (format) 0-2.

As an embodiment, one physical layer signaling carries scheduling information of a corresponding MAC PDU, where the scheduling information includes occupied time domain resources, occupied frequency domain resources, HARQ (Hybrid Automatic Repeat reQuest ) process number, MCS (Modulation and Coding Status, modulation coding status), RV (Redundancy Version ), NDI (New Data Indicator, new data indication), and the like.

As an embodiment, the second information unit indicates the second set of data units.

As an embodiment, the first information unit and the second information unit each comprise a control PDU of one RLC sublayer.

As an embodiment, the first information unit and the second information unit each include a control PDU of one PDCP sublayer.

As an embodiment, the second information unit comprises a bitmap (bitmap), each bit in the bitmap indicating whether a data unit is obtained, all indicated data units in the second information unit that are not correctly received constituting the second set of data units.

As an embodiment, the sender of the second set of data units is the same communication node as the target receiver of the second information unit (i.e. the third node U3).

As an embodiment, the sender of the second set of data units is the sender of one status message of the first set of messages; the one set of data units indicated by the one status message sent by the sender of the second set of data units comprises the second set of time units.

As an embodiment, any one data unit of the second set of data units belongs to the first set of data units.

As an embodiment, the second set of data units comprises a plurality of data units.

As an embodiment, the reception state of the first node comprises a third set of data units received by the first node, any data unit of the first set of data units not belonging to the third set of data units.

As an embodiment, the generating entity and the target receiving entity of the first set of data units both belong to a first radio bearer.

As an embodiment, both the generating entity and the target receiving entity of the second set of data units belong to the first radio bearer.

As an embodiment, the third set of data units is transmitted over the first radio bearer.

As an embodiment, the first status message is sent periodically.

As an embodiment, the third node U3 releases at least part of the storage space for storing received data units of the first radio bearer in the step S301, and the act releases at least part of the storage space for storing received data units of the first radio bearer to be used for triggering the first status message.

As an embodiment, the data unit sent in the step S200 can be received by the first node U1 and the third node U3 at the same time, avoiding two transmissions and improving transmission efficiency.

As an embodiment, the destination of the data unit sent in step S200 is the first identity, and the third node U3 is configured to relay data for the destination identified by the first identity.

As an embodiment, the behavior monitoring in the step S204 includes: blind Decoding (Blind Decoding) is performed for target physical layer signaling carrying part of the bits in the third identity and part of the bits in the first identity.

As an embodiment, the behavior monitoring in the step S204 includes: and when the target physical layer signaling is detected, carrying out channel decoding on the physical layer data channel scheduled by the target physical layer signaling.

As an embodiment, the behavior monitoring in the step S204 includes CRC (Cyclic Redundancy Check ) verification; if the CRC verification is passed, the corresponding data unit is considered to be correctly decoded; if the CRC verification is not passed, the corresponding data unit is deemed to be incorrectly decoded.

As an embodiment, the channel occupied by the target physical layer signaling is PSCCH (Physical Sidelink Control CHannel ); the physical layer channel occupied by the data unit is PSSCH.

As an embodiment, the time-frequency resources occupied by the data units transmitted in step S200 and step S203 belong to a Resource Pool (Resource Pool).

As an example, the one resource pool is allocated to V2X (Vehicle to everything, automobile to outside).

As an embodiment, the one resource pool is allocated to a sidelink.

As an embodiment, the first set of data units is a union of received data units indicated by the first set of messages.

As an embodiment, the data units sent in the step S203 do not include data units in the first set of data units.

In the above embodiment, the second node U2 may wait for the third node U3 or other relay nodes to retransmit the data units in the first data unit set, so as to avoid a decrease in transmission efficiency caused by retransmission of the second node U2; in addition, the channel quality from the relay node to the first node U1 may be better than the channel quality from the second node U2 to the first node U1, further improving the transmission efficiency.

As an embodiment, each of the data units corresponds to an index.

While in the conventional scheme the status information is reported by the data receiver to the data sender, in embodiment 5 the status information is reported by the potential data sender (third node U3) to the data receiver (first node U1), on the one hand the first node U1 can be enabled to request the relay node to retransmit a specific data unit, and on the other hand the first node can be enabled to generate the first information unit and send it to the data source (second node U2).

Example 6

Embodiment 6 illustrates a flowchart for maintaining a first list of identities according to one embodiment of the present application, as shown in fig. 6. The steps of fig. 6 are performed in the first node.

The first node monitors a second set of data units over the air interface in said step S601; determining in step S602 whether any data unit of the second set of data units is received within a first time window; if not, the third identity is purged from the first identity list in step S603, and then step S604 is performed; if so, data of the data source identified by any identity in the first list of identities is received in step S604.

As one embodiment, the act of receiving data of a data source identified by any identity in the first list of identities includes: and monitoring physical layer signaling through a sidelink, when the detected physical layer signaling comprises part of bits in any identity in the first identity list, performing channel decoding on a physical layer channel scheduled by the detected physical layer signaling, and when the detected physical layer signaling does not comprise part of bits in any identity in the first identity list, discarding performing channel decoding on the physical layer channel scheduled by the detected physical layer signaling.

As one embodiment, the act of receiving data of a data source identified by any identity in the first list of identities includes: and when the detected physical layer signaling and the MAD PDU scheduled by the detected physical layer signaling carry any identity in the first identity list together, distributing the MAD PDU scheduled by the detected physical layer signaling to a subsequent entity.

As one embodiment, the act of receiving data of a data source identified by any identity in the first list of identities includes: and when the detected physical layer signaling and the MAD PDU scheduled by the detected physical layer signaling do not carry any one of the first identity list together, discarding the MAD PDU scheduled by the detected physical layer signaling from being distributed to the subsequent entity.

As one embodiment, the act of receiving data of a data source identified by any identity in the first list of identities includes: and discarding the MAD PDU scheduled by the detected physical layer signaling when the detected physical layer signaling and the MAD PDU scheduled by the detected physical layer signaling do not carry any identity in the first identity list together.

As an embodiment, the subsequent Entity includes a decomposition (Disassembly) and a Demultiplexing (multiplexing) Entity (Entity).

As an embodiment, the subsequent Entity comprises an RLC (Radio Link Control ) Entity (Entity).

As an embodiment, the time domain resources occupied by the second information unit are used to determine the time domain resources occupied by the first time window.

As an embodiment, the L1 st slot after the slot occupied by the second information unit is the first slot of the first time window, and L1 is a positive integer.

As one example, L1 is a fixed constant.

As an embodiment, the L1 is configurable.

As an embodiment, L1 is not greater than 40.

As an embodiment, the duration of the first time window is configurable.

As an embodiment, the duration of the first time window is fixed.

As an embodiment, the first time window is configured by RRCReconfiguration IE (Information Element ).

As an embodiment, the first time window is configured by RRCConnectionReconfiguration IE (Information Element ).

As an embodiment, the first time window comprises L2 time slots, and L2 is a positive integer.

As an embodiment, the L2 is not greater than 10000.

As an embodiment, if any one of the set of second data units fails to be received within the first time window, sending a first updated information unit over the air interface; the first updated information element indicates a first updated set of data elements, the receipt of each data element in the first updated set of data elements being indicated by a first set of reference messages, the first set of reference messages consisting of all status messages in the first set of messages except the status message sent by the intended recipient of the second information element; any data unit in the first updated set of data units has not been received by the first node.

As an embodiment, in the foregoing embodiment, the first node may quickly discover that a link from the node of the third identity to the first node fails, and start the second node to retransmit a specific data unit as soon as possible, where the specific data unit should be retransmitted by the node of the third identity; the above-described embodiments reduce transmission delay.

As an embodiment, the first updated set of data units lacks data units indicated by the status message sent only by the intended recipient of the second information unit compared to the first set of data units.

As an embodiment, the first updated information element indicates an update reception status of the first node; the updated reception status of the first node comprises data units that the first node has currently received.

As an embodiment, the number of bits comprised by the partial bits is a positive integer multiple of 8.

As an embodiment, the second set of data units comprises only one data unit.

Example 7

Embodiment 7 illustrates a schematic diagram of a protocol architecture for relay transmission according to one embodiment of the present application, as shown in fig. 7. In fig. 7, the RLC sublayer 6205 is optional.

In fig. 7, in relay transmission, taking an example that data is transmitted to a first node by a second node (data is equally available to the second node by the first node): the first target data is sequentially processed by the PDCP sublayer 6302 and the RLC sublayer 6303 on the second node side to generate a first target MAC PDU on the MAC layer 6304, then the first target MAC PDU is transmitted to the PHY layer 6305, then the first target PDU is transmitted to the PHY layer 6202 of the third node through an air interface, and then the first RLC data is recovered through the processing of the MAC layer 6204 and the RLC sublayer 6205; the first RLC data is recombined into second RLC data (optional) at the RLC sublayer 6205, and then processed by the MAC sublayer 6203 to generate a second target MAC PDU, which is then transferred to the PHY layer 6201; and then transmitted to the PHY layer 6105 of the first node through the air interface, and then sequentially recovered by the MAC6104 to obtain the second target MAC PDU, and then sequentially processed by the RLC sublayer 6103 and PDCP sublayer 6102 to obtain the second target data.

As an embodiment, the RLC sublayer 6205 cannot perform data segmentation on RLC SDUs.

As an embodiment, the RLC sublayer 6205 does not modify SN (Sequence Number) of the RLC SDU generated at the RLC sublayer 6303; for each RLC SDU, the SN recovered by the RLC sublayer 6103 is the same as the SN generated at the RLC sublayer 6303.

As an embodiment, the RLC sublayer 6205 may retransmit RLC SDUs.

As an embodiment, the RLC sublayer 6205 may perform data combining on RLC SDUs.

As an embodiment, the RLC sublayer 6205 performs no data combining nor data segmentation on RLC SDUs, performs only store, forward, and retransmit if necessary; the second RLC data is identical to the first RLC data.

As an embodiment, the first target MAC PDU and the second target MAC PDU comprise the same data unit, respectively, which belongs to the first set of data units and the second set of data units.

The first MAC PDU and the fourth MAC PDU.

As an embodiment, the first target data is generated at the RRC/SDAP 6301 and the second target data is transferred to the RRC/SDAP 6101.

As an embodiment, the first target MAC PDU and the second target MAC PDU each carry the first information element.

As an embodiment, the first radio bearer includes entities corresponding to the following sublayers: the PDCP 6102, the RLC sublayer 6103, the RLC sublayer 6303, and the PDCP 6302.

As an embodiment, the first radio bearer includes entities corresponding to the following sublayers: the RRC/SDAP 6101 and the RRC/SDAP 6301.

As an embodiment, the first radio bearer is multiplexed to a MAC entity corresponding to the MAC 6104 and a MAC entity corresponding to the MAC 6304.

Example 8

Embodiment 8 illustrates a schematic diagram of an identity according to one embodiment of the present application, as shown in fig. 8.

In embodiment 8, one identity includes a first portion and a second portion.

As an embodiment, the number of bits comprised by the first part and the number of bits comprised by the second part are both positive integer multiples of 8.

As an embodiment, the second portion comprises twice the number of bits as the second portion.

As an embodiment, the second part is carried by MAC PDU and the first part is carried by physical layer signaling.

As an embodiment, the number of bits comprised by the one identity is not less than 24.

As an embodiment, the one identity is a Link Layer identity (Link Layer ID).

As one embodiment, the one identity is any one of the first identity, the second identity and the third identity.

As an example, the leftmost bit of the one identity in fig. 8 is the Most Significant Bit (MSB) and the rightmost bit is the Least Significant Bit (LSB).

As an embodiment, when the one identity is used to identify a destination node, the one identity is divided into the first part and the second part.

As an embodiment, the second portion and the first portion are indicated by the second domain and the first domain, respectively.

Example 9

Embodiment 9 illustrates yet another schematic of an identity, as shown in fig. 9.

In embodiment 9, one identity includes a third portion and a fourth portion.

As an embodiment, the number of bits comprised by the third portion and the number of bits comprised by the fourth portion are both positive integer multiples of 8.

As an embodiment, the third portion comprises twice the number of bits as the fourth portion.

As an embodiment, the fourth part is carried by MAC PDU and the third part is carried by physical layer signaling.

As an embodiment, the one identity is a Link Layer identity (Link Layer ID).

As an example, the leftmost bit of the one identity in fig. 9 is the most significant bit and the rightmost bit is the least significant bit.

As an embodiment, when the one identity is used to identify the source node, the one identity is divided into the third part and the fourth part.

As an embodiment, the fourth portion and the third portion are indicated by the third domain and the fourth domain, respectively.

Example 10

Embodiment 10 illustrates a schematic diagram of a MAC PDU according to one embodiment of the present application, as shown in fig. 10.

In embodiment 10, 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, the MAC PDU is transmitted on a SL-SCH (SideLink Shared CHannel, secondary link shared channel).

As an embodiment, the number of bits comprised by the MAC header is fixed.

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

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

As an embodiment, the other bits include 5 fields, V, R, R, R, R, and the number of bits included is 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 an SRC domain and a 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, logical channel identity) indicating a channel identity of a logical channel corresponding to the respective MAC SDU.

As an embodiment, the LCID field comprises 5 bits.

As an embodiment, the LCID field comprises 6 bits.

As an example, the MAC PDU of fig. 10 carries at least one data unit of the present application.

As an example, the MAC PDU in fig. 10 carries the first information element in the present application.

As an embodiment, the MAC PDU in fig. 10 carries the first updated information element in the present application.

As an example, the MAC PDU in fig. 10 carries the second information element in the present application.

Example 11

Embodiment 11 illustrates a schematic diagram of a plurality of relay nodes according to one embodiment of the present application, as shown in fig. 11.

In embodiment 11, there are Q1 candidates for relaying data transmitted by the second node 1102 to the first node 1101, the Q1 candidates including the third node 1103, the relay node #1, the relay node #2, and the like; the first node selecting the third node 1103 from the Q1 candidates as the receiver of the second information unit;

in embodiment 11, the first set of messages includes Q1 status messages, the Q1 status messages are sent by the Q1 candidates, the one set of data units indicated by the Q1 status messages includes the second set of data units, and the Q1 is a positive integer greater than 1.

As an embodiment, the data unit sent by the second node 1102 is received by the Q1 candidates simultaneously through links L1, L2, L3, etc.

As an embodiment, the first node 1101 measures Q1 channel qualities, the Q1 channel qualities respectively corresponding to the wireless channels of the Q1 candidates to the first node 1101; the channel quality of the third node 1103 is the best of the Q1 channel qualities.

As one embodiment, the wireless channels of the Q1 candidates to the first node 1101 include L4, L5, L6, and the like.

As an embodiment, the channel quality includes at least one of RSRP, RSRQ and SINR.

As one embodiment, the first node 1101 calculates Q1 distances, the Q1 distances corresponding to distances from the Q1 candidates to the first node 1101, respectively; the distance of the third node 1103 is the shortest of the Q1 distances.

As an embodiment, the distance of the two communication nodes is calculated from the Zone identities (Zone IDs) of the two communication nodes.

As an embodiment, the first node 1101 randomly selects the third node 1103 from the Q1 candidates, wherein the probability that any one of the Q1 candidates is selected as the third node 1103 is the same.

The embodiment can effectively balance the loads of a plurality of relay nodes.

Example 12

Embodiment 12 illustrates a block diagram of a processing apparatus for use in a first node according to one embodiment of the present application; as shown in fig. 12. In fig. 12, the processing means 1200 in the first node comprises a first receiver 1201 and a first transmitter 1202.

The first receiver 1201 receives a first set of messages over an air interface, the first set of messages including at least one status message therein; the first transmitter 1202 transmits a first information unit over an air interface;

in embodiment 12, each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units comprising at least one data unit; the first information unit indicates a reception status of the first node and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the first node; the sender of any status message in the first set of messages is non-co-located with the target recipient of the first information unit.

As an embodiment, the first transmitter 1202 transmits the second information unit over an air interface; the first receiver 1201 monitors a second set of data units over an air interface; wherein the second information unit is used to trigger transmission of the second set of data units; the receiver of the first information unit is not co-located with a target receiver of the second information unit, and the sender of the second set of data units is not co-located with the receiver of the first information unit.

As an embodiment, the first receiver 1201 selects the receiver of the second information unit from Q1 candidates;

As an embodiment, the first receiver 1201 clears the third identity from the first identity list if any one of the second set of data units fails to be received within the first time window; and receiving the data of the data source identified by any identity in the first identity list.

As an embodiment, the reception status of the first node processing apparatus 1200 includes a third set of data units received by the first node, any data unit of the first set of data units not belonging to the third set of data units.

As an embodiment, the first receiver 1201 receives data units over a first radio bearer;

As an embodiment, the first information unit is used by the intended recipient of the first information unit to determine not to retransmit the first set of data units and not to free up storage space for the first set of data units.

As an embodiment, the first node is a user equipment.

As an example, the first transmitter 1201 includes at least one of the antenna 452, the transmitter/receiver 454, the multi-antenna transmitter processor 457, the transmission processor 468, the controller/processor 459, the memory 460, and the data source 467 of fig. 4 of the present application.

As an example, the first transmitter 1201 includes the antenna 452, the transmitter/receiver 454, the multi-antenna transmitter processor 457, the transmission processor 468, the controller/processor 459, the memory 460, and the data source 467 of fig. 4 of the present application.

As an example, the first receiver 1202 includes at least the first five of the antenna 452, the receiver 454, the multi-antenna receive processor 458, the receive processor 456, the controller/processor 459, the memory 460 and the data source 467 of fig. 4 of the present application.

As an example, the first receiver 1202 includes at least the first four of the antenna 452, the receiver 454, the multi-antenna receive processor 458, the receive processor 456, the controller/processor 459, the memory 460 and the data source 467 of fig. 4 of the present application.

Example 13

Embodiment 13 illustrates a block diagram of a processing apparatus for use in a second node according to one embodiment of the present application; as shown in fig. 13. In fig. 13, the processing means 1300 in the second node comprises a second transmitter 1301 and a second receiver 1302.

The second receiver 1302 receives the first information unit over an air interface;

in embodiment 13, the first information element indicates a reception status of a sender of the first information element and a first set of data elements, reception of each data element in the first set of data elements being indicated by a first set of messages, any data element in the first set of data elements not yet being received by the sender of the first information element; the first set of messages includes at least one status message, each of the status messages in the first set of messages indicating that one set of data units is obtained, the one set of data units including at least one data unit; the sender of any status message in the first set of messages is non-co-located with the second node; the first set of messages is sent over an air interface.

As an embodiment, the first transmitter 1301 sends data units over a first radio bearer;

As an embodiment, the first transmitter 1301 determines, based on the first information element, not to retransmit the first set of data elements and not to release the storage space of the first set of data elements.

As an embodiment, the second node 1300 is a user device.

As an embodiment, the second transmitter 1301 includes the antenna 420, the transmitter 418, the transmitting processor 416, and the controller/processor 475.

As an example, the second transmitter 1301 includes the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416, and the controller/processor 475.

As an example, the second receiver 1302 includes the antenna 420, the receiver 418, the multi-antenna receive processor 472, the receive processor 470, and the controller/processor 475.

The second receiver 1302, as one embodiment, includes the controller/processor 475.

Example 14

Embodiment 14 illustrates a block diagram of a processing apparatus for use in a third node according to one embodiment of the present application; as shown in fig. 14. In fig. 14, the processing means 1400 in the third node comprises a third receiver 1401 and a third transmitter 1402.

The third transmitter 1402 sends a first status message over an air interface; the first status message is one status message in a first set of messages;

in embodiment 14, each of the status messages in the first set of messages indicates that one set of data units is obtained, the one set of data units including at least one data unit; a first information unit indicating a reception status of a target recipient of the first status message and a first set of data units, reception of each data unit in the first set of data units being indicated by the first set of messages, any data unit in the first set of data units not yet being received by the recipient of the first status message; the first information element air interface is transmitted, and a sender of any status message in the first set of messages is not co-located with a target recipient of the first information element.

As an embodiment, the third receiver 1401 receives a second information element via the air interface; the third transmitter 1402 transmitting the second set of data units over an air interface;

As an embodiment, the third receiver 1401 receives data units via a first radio bearer;

As an example, the second transmitter 1402 includes the antenna 420, the transmitter 418, the transmit processor 416, and the controller/processor 475.

As an example, the second transmitter 1402 includes the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416, and the controller/processor 475.

As an example, the second receiver 1401 includes the antenna 420, the receiver 418, the multi-antenna receive processor 472, the receive processor 470, and the controller/processor 475.

The second receiver 1401, as one embodiment, includes the controller/processor 475.

Example 15

Embodiment 15 illustrates a block diagram of control signaling according to one embodiment of the present application, as shown in fig. 15. In fig. 15, one control signaling includes a first domain, a second domain, and other domains.

As an embodiment, the first field indicates a first RLC SN and the second field indicates a second RLC SN.

As a sub-embodiment of the above embodiment, the one control signaling is a control PDU of one RLC sub-layer.

As an embodiment, the first field and the second field each comprise 6 bits.

As an embodiment, the first field and the second field each comprise 12 bits.

As an embodiment, the first field and the second field each comprise 18 bits.

As an embodiment, the RLC PDU identified by the second RLC SN follows the RLC PDU identified by the first RLC SN.

As an embodiment, the one control signaling is the first information element, and the receiving state of the first node includes: RLC PDUs preceding the first RLC SN are all received by the first node; RLC PDUs between the first RLC SN and the second RLC SN have not been received by the first node but have been received by the relay node, and RLC PDUs indicated by the first RLC SN have not been received by the first node but have been received by the relay node.

As an embodiment, the RLC PDU indicated by the second RLC SN has not been received by the first node but has been received by a relay node.

As an embodiment, the RLC PDU indicated by the second RLC SN has not been received by the first node and has not been received by a relay node.

As an embodiment, the control PDU of the one RLC sublayer is a STATUS PDU, the first field is an ack_sn, and the second field is adjacent to the first field in the control PDU of the one RLC sublayer.

As an embodiment, the control PDU of the one RLC sublayer is a STATUS PDU, the first field is an ack_sn, and the second field is a last field in the control PDU of the one RLC sublayer.

As an embodiment, the first field indicates a first bit map, the second field indicates a second bit map, each bit in the first bit map indicates whether a data unit is received by the first node, and each bit in the second bit map indicates whether a data unit is received by the relay node.

As a sub-embodiment of the above embodiment, the one control signaling is a control PDU of one PDCP sublayer.

As an embodiment, the number of bits in the second bit map is the same as the number of bits in the first bit map indicating that the corresponding data unit was not received by the first node.

As an embodiment, the above embodiment can reduce signaling overhead.

As an embodiment, the one control signaling is a control PDU of one RLC sublayer, the first field indicates a first RLC SN, the second field indicates a second bit map, RLC PDUs before the first RLC SN are all received by the first node, and each bit in the second bit map indicates whether a next RLC PDU is received by the relay node in order from the RLC PDU indicated by the first RLC SN.

As an embodiment, the above embodiment can reduce signaling overhead.

Those of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described methods may be implemented by a program that instructs associated hardware, and the program may be stored on 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 using one or more integrated circuits. Accordingly, each module unit in the above embodiment may be implemented in a hardware form or may be implemented in a software functional module form, and the application is not limited to any specific combination of software and hardware. User equipment, terminals and UEs in the present application include, but are not limited to, unmanned aerial vehicles, communication modules on unmanned aerial vehicles, remote control airplanes, aircraft, mini-planes, mobile phones, tablet computers, notebooks, vehicle-mounted communication devices, wireless sensors, network cards, internet of things terminals, RFID terminals, NB-IOT terminals, MTC (Machine Type Communication ) terminals, eMTC (enhanced MTC) terminals, data cards, network cards, vehicle-mounted communication devices, low cost mobile phones, low cost tablet computers, and other wireless communication devices. The base station or 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, transmitting and receiving node), and other wireless communication devices.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application are intended to be included within the scope of the present application.

Claims

1. A first node for wireless communication, comprising:

a first receiver that receives a first status message over an air interface, the first status message generated at a MAC layer;

a first transmitter for transmitting a first information element over an air interface, said first information element being a MAC CE;

wherein the first status message indicates that a first set of data units is obtained, the first set of data units comprising at least one data unit; the first information unit indicates a receiving state of the first node and the first data unit set, acquisition of each data unit in the first data unit set is indicated by the first state message, and any data unit in the first data unit set has not been received by the first node; the sender of the first status message is non-co-located with the target receiver of the first information unit.

2. The first node of claim 1, comprising:

the first transmitter transmitting a second information element over an air interface;

the first receiver monitoring a second set of data units over an air interface;

3. The first node of claim 2, comprising:

the first receiver clearing the third identity from the first identity list if any one of the second set of data units fails to be received within the first time window; and receiving the data of the data source identified by any identity in the first identity list.

4. A first node according to any of claims 1-3, characterized in that the reception status of the first node comprises a third set of data units received by the first node, any data unit of the first set of data units not belonging to the third set of data units.

5. The first node according to any of claims 1 to 4, comprising:

the first receiver receives data units through a first radio bearer;

wherein the first status message and the first information element are both for the first radio bearer.

6. The first node according to any of claims 1-5, characterized in that the first information unit is used by an intended recipient of the first information unit to determine not to retransmit the first set of data units and not to free up storage space for the first set of data units.

7. A second node for wireless communication, comprising:

a second receiver for receiving a first information element over an air interface, said first information element being a MAC CE;

wherein the first information element indicates a reception status of a sender of the first information element and a first set of data elements, reception of each data element in the first set of data elements being indicated by a first status message, the first status message being generated at a MAC layer; any data unit of the first set of data units has not been received by the sender of the first information unit; the first status message indicates that the first set of data units is obtained, the first set of data units including at least one data unit; the sender of the first status message is not co-located with the second node; the first status message is sent over an air interface.

8. The second node of claim 7, comprising:

a second transmitter for transmitting data units over the first radio bearer;

9. The second node according to claim 7 or 8, comprising:

and a second transmitter for determining not to retransmit the first data unit set and not to release the storage space of the first data unit set according to the first information unit.

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

receiving a first status message over an air interface, the first status message generated at a MAC layer;

transmitting a first information element over an air interface, said first information element being a MAC CE;

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

receiving a first information element over an air interface, said first information element being a MAC CE;