CN114125763A

CN114125763A - Method and device for relay transmission

Info

Publication number: CN114125763A
Application number: CN202010909038.6A
Authority: CN
Inventors: 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2020-08-28
Filing date: 2020-09-02
Publication date: 2022-03-01

Abstract

The invention discloses a method and a device for relay transmission. A first node sends a first physical layer signaling and a first MAC PDU through an air interface, wherein the first MAC PDU comprises a first MAC head and a first MAC SDU; monitoring for a first HARQ-ACK on each channel in a first set of channels, the first HARQ-ACK indicating whether the first MAC PDU was decoded correctly; wherein the first physical layer signaling comprises scheduling information of the first MAC PDU; the first set of channels comprises Q channels, the Q being a non-negative integer; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold. The method and the device can reduce air interface overhead and delay and improve transmission robustness.

Description

Method and device for relay transmission

Technical Field

The present application relates to a method and an apparatus in a wireless communication system, and more particularly, to a scheme and an apparatus for supporting relay transmission in a wireless communication system.

Background

Relay communication is a common method in cellular network communication, and data of a source node reaches a remote node through forwarding of a relay node. The source node and the remote node are usually a base station device and a user device, and may be both user devices; the relay node may be a network device or a user equipment. Common relay communication includes layer 1 relay and layer 2 relay, where the former relay node forwards information bits restored in a physical layer, and the latter relay node forwards information bits restored in layer 2.

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

Disclosure of Invention

The inventors have found through research that if a source node can realize reliable data transmission with a remote node through a relay node, the BLER (BLock Error Rate) of signaling is usually much lower than that of data, and therefore a direct link between the source node and the remote node can usually perform signaling transmission with at least higher BLER. The inventor finds out through further research that: the data retransmission operation of the source node can be reduced by utilizing the direct link between the source node and the remote node, and the transmission efficiency is further remarkably improved.

In view of the above analysis, the present application discloses a solution. It should be noted that, in some embodiments of the present application, the source node, the relay node, and the remote node are all user equipment; the present application is also applicable to relay transmission with network equipment participating in the similar problem, for example, the source node is a base station equipment, or the relay node is a base station equipment, or the remote node is a base station equipment, and similar technical effects are achieved. Furthermore, the unified solution adopted by different scenarios (including but not limited to V2X, upstream communication, downstream communication, etc.) also helps to reduce hardware complexity and cost. Without conflict, embodiments and features of embodiments in any node of the present application may be applied to any other node. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

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

sending a first physical layer signaling and a first MAC (Media Access Control) PDU (Protocol Data Unit) through an air interface, where the first MAC PDU includes a first MAC Header and a first MAC SDU (service Data Unit);

monitoring a first HARQ (Hybrid Automatic Repeat reQuest) -ACK (acknowledgement) on each channel in a first channel set, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly;

wherein the first physical layer signaling comprises scheduling information of the first MAC PDU; the first set of channels comprises Q channels, the Q being a non-negative integer; whether the number of continuous HARQ DTX (Discontinuous Transmission) reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first Radio Bearer (Radio Bearer) that is independent of whether the number of consecutive HARQ DTXs reaches the first threshold.

As an embodiment, in the method, the first node determines whether the target link fails according to the number of continuous HARQ DTX on the target link, and further determines whether to continue monitoring HARQ-ACK on the target link; so as to more accurately judge whether to perform data retransmission.

Specifically, according to an aspect of the present application, the method as described above is characterized by including whether the number of continuous HARQ DTX reaches the first threshold or not is used to determine a first field in the first MAC header and a second field in the first physical layer signaling, the first field in the first MAC header and the second field in the first physical layer signaling indicating a destination of the first MAC PDU.

As an embodiment, the above method implicitly indicates whether the number of continuous HARQ DTX reaches the first threshold, so as to avoid redundancy overhead caused by configuration signaling.

As an embodiment, the method can implement fast switching of the Q value according to whether the number of the continuous HARQ DTX reaches the first threshold, and further adjust the policy of data retransmission in time.

Specifically, according to one aspect of the present application, the method described above is characterized by including:

when the number of continuous HARQ DTX reaches the first threshold, sending a second message through an air interface;

wherein the second message is used to determine that the first set of channels does not include a first channel.

As an embodiment, the above method allows the relay node and the remote node to reuse one destination identity, avoiding the need to design special redundant signaling for the relay node to distinguish whether it is data for itself or data that needs to be forwarded by itself.

Specifically, according to an aspect of the present application, the method is characterized by including, when the number of continuous HARQ DTX reaches the first threshold, the Q is Q1; when the number of continuous HARQ DTX does not reach the first threshold, the Q is Q2; the Q1 is not greater than the difference of Q2 minus 1.

As an example, the Q1 and the Q2 are 1 and 2, respectively.

receiving a second MAC PDU through an air interface after the time domain resource occupied by the first channel set, wherein the second MAC PDU comprises a second MAC head and a second MAC SDU;

transmitting a third MAC PDU over an air interface, the third MAC PDU comprising a third MAC header and a third MAC SDU;

monitoring for a second HARQ-ACK on each channel in a second set of channels, the second HARQ-ACK indicating whether a third MAC PDU was decoded correctly;

wherein the number of consecutive HARQ DTX reaches the first threshold; the second MAC PDU is used to determine that the second set of channels includes Q2 channels, the third MAC PDU being transmitted over the first radio bearer.

As an embodiment, the above aspect enables the first node to restore the number of channels in the second set of channels from Q1 to Q2 when a target link quality improves, improving transmission efficiency.

discarding retransmission of the first MAC PDU over an air interface when an ACK for the first MAC PDU is detected on any one of the first set of channels; retransmitting the first MAC PDU over an air interface when no ACK for the first MAC PDU is detected on all channels in the first set of channels;

wherein the number of continuous HARQ DTXs does not reach the first threshold, the Q is greater than 1, and at least one of the Q channels is reserved for transmitting the first HARQ-ACK by a communication node other than a target receiver of the first MAC PDU.

As an embodiment, the method can significantly reduce data retransmission of the first node, and improve spectrum utilization efficiency.

receiving a fifth MAC PDU over an air interface, the fifth MAC PDU comprising a first RLC PDU; if the first RLC PDU indicates that the RLC SDU carried by the first MAC SDU has reached the maximum retransmission times, releasing the first radio bearer;

wherein the first RLC PDU indicates whether the RLC SDU carried by the first MAC SDU is received.

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

receiving a first physical layer signaling through an air interface, and detecting a first MAC PDU through the air interface, wherein the first MAC PDU comprises a first MAC head and a first MAC SDU;

sending the first HARQ-ACK on a first channel in the first channel set, or abandoning sending the first HARQ-ACK;

wherein the first set of channels includes Q channels, and Q is a non-negative integer; whether to send the first HARQ-ACK is related to the Q, the first set of channels being reserved for the first HARQ-ACK, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly; the first physical layer signaling comprises scheduling information of the first MAC PDU; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

receiving a second message over an air interface;

wherein the second message is used to determine that the first set of channels does not include the first channel, the second message being triggered in response to the number of continuous HARQ DTXs reaching the first threshold; in response to receiving the second message, the act of forgoing sending the first HARQ-ACK is performed.

after the time domain resource occupied by the first channel set, sending a second MAC PDU through an air interface, wherein the second MAC PDU comprises a second MAC head and a second MAC SDU;

receiving a third MAC PDU through an air interface, wherein the third MAC PDU comprises a third MAC header and a third MAC SDU;

transmitting a second HARQ-ACK on one channel in a second set of channels, the second HARQ-ACK indicating whether a third MAC PDU was decoded correctly;

wherein the number of consecutive HARQ DTX reaches the first threshold; the second MAC PDU is used to determine that the second set of channels includes Q2 channels; the third MAC PDU is transmitted over the first radio bearer.

receiving a fourth MAC PDU over an air interface, the fourth MAC PDU comprising a fourth MAC header and the first MAC SDU;

wherein the number of continuous HARQ DTX does not reach the first threshold, the Q is greater than 1, at least one of the Q channels is reserved for the sender of the fourth MAC PDU to send the first HARQ-ACK; the second node is a target recipient of the first MAC PDU and the sender of the fourth MAC PDU is not a target recipient of the first MAC PDU; the sender of the fourth MAC PDU sends a first HARQ-ACK in the first set of channels indicating correct decoding of the first MAC PDU.

transmitting a fifth MAC PDU over an air interface, the fifth MAC PDU comprising a first RLC PDU;

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

monitoring for a first HARQ-ACK on a first channel of a first set of channels; or, abandoning monitoring the first HARQ-ACK;

transmitting a first HARQ-ACK on one channel in a first set of channels;

wherein the first set of channels includes Q channels, and Q is a non-negative integer; whether to monitor the first HARQ-ACK is related to the Q, the first set of channels being reserved for the first HARQ-ACK, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly; the first physical layer signaling comprises scheduling information of the first MAC PDU; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

Specifically, according to one aspect of the present application, the above method is characterized by including that at least the former of the second field in the first physical layer signaling and the first field in the first MAC header is used for determining whether the number of continuous HARQ DTX reaches the first threshold, the first field in the first MAC header and the second field in the first physical layer signaling indicating a destination of the first MAC PDU.

receiving a second message over an air interface;

wherein the second message is used to determine that the first set of channels does not include a first channel, the second message being triggered in response to the number of continuous HARQ DTXs reaching the first threshold.

In particular, according to an aspect of the application, the above method is characterized in that the number of consecutive HARQ DTX's does not reach the first threshold, the third node monitors the first HARQ-ACK on the first channel of the first set of channels and the detected first HARQ-ACK is an ACK; the first HARQ-ACK sent by the third node on the one of the first set of channels is an ACK regardless of whether the first MAC PDU was decoded correctly by the third node.

transmitting a fourth MAC PDU over an air interface, the fourth MAC PDU comprising a fourth MAC header and the first MAC SDU;

wherein the number of continuous HARQ DTX does not reach the first threshold, the Q is greater than 1; the third node is not a target recipient of the first MAC PDU; the third node transmits the first HARQ-ACK on the one of the first set of channels.

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

a first transmitter to transmit a first physical layer signaling and a first MAC PDU over an air interface, the first MAC PDU including a first MAC header and a first MAC SDU;

a first receiver to monitor for a first HARQ-ACK on each channel in a first set of channels, the first HARQ-ACK indicating whether the first MAC PDU was decoded correctly;

wherein the first physical layer signaling comprises scheduling information of the first MAC PDU; the first set of channels comprises Q channels, the Q being a non-negative integer; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

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

a second receiver, configured to receive a first physical layer signaling through an air interface, and detect a first MAC PDU through the air interface, where the first MAC PDU includes a first MAC header and a first MAC SDU;

a second transmitter, configured to send the first HARQ-ACK on one channel in the first set of channels, or to forgo sending the first HARQ-ACK;

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

a third receiver, configured to receive a first physical layer signaling through an air interface, and detect a first MAC PDU through the air interface, where the first MAC PDU includes a first MAC header and a first MAC SDU; monitoring for a first HARQ-ACK on a first channel of a first set of channels; or, abandoning monitoring the first HARQ-ACK;

a third transmitter to transmit a first HARQ-ACK on one channel of the first set of channels;

Drawings

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

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

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

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

FIG. 4 shows a hardware module diagram of a communication node according to an embodiment of the application;

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

fig. 6 shows a flow diagram of a retransmission of a first MAC SDU according to an embodiment of the present application;

fig. 7 shows a schematic diagram of a protocol architecture for relay transmission according to an embodiment of the application;

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

FIG. 9 shows yet another schematic diagram of an identity in accordance with an embodiment of the present application;

FIG. 10 shows a diagram of a MAC PDU in accordance with one embodiment of the application;

fig. 11 shows a flow diagram of determining whether to listen for a first HARQ-ACK on a first channel according to first physical layer signaling according to an embodiment of the present application;

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

figure 13 shows a block diagram of a processing arrangement for use in a second node according to an embodiment of the present application;

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

fig. 15 illustrates a diagram of determining the second channel set from a second MAC PDU according to one embodiment of the present application.

Detailed Description

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

Example 1

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

In embodiment 1, a first node 100 transmits, in step 101, first physical layer signaling and a first MAC PDU including a first MAC header and a first MAC SDU over an air interface; monitoring for a first HARQ-ACK on each channel of a first set of channels in step 102, the first HARQ-ACK indicating whether the first MAC PDU was decoded correctly;

in embodiment 1, the first physical layer signaling includes scheduling information of the first MAC PDU; the first set of channels comprises Q channels, the Q being a non-negative integer; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

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

For one embodiment, the air interface includes a PC5 interface.

For one embodiment, the air interface comprises a Uu interface.

For one embodiment, the second node is a target recipient of the first MAC PDU.

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

As an embodiment, the target receiver of a MAC PDU refers to: and receiving the MAC PDU through an air interface, and not forwarding the MAC SDU carried in the MAC PDU through the air interface any more.

As an embodiment, the target receiver of a MAC PDU refers to: and receiving the MAC PDU through an air interface, and not forwarding RLC (Radio Link Control) SDU (Radio Link Control) carried in the MAC PDU through the air interface any more.

As an embodiment, the target receiver of a MAC PDU refers to: and receiving the MAC PDU through an air interface, and transferring the data carried in the MAC PDU to a PDCP layer.

As an embodiment, the target receiver of a MAC PDU refers to: the one MAC PDU is received through an air interface, and data carried in the one MAC PDU is transferred to NAS (Non-Access Stratum).

As an embodiment, the number of continuous HARQ DTX refers to the number of feedback channels that the second node continuously gives up sending for the data channel sent by the first node, where the feedback channels carry HARQ-ACKs associated with the data channel.

As an embodiment, the number of consecutive HARQ DTX is the same as the number of physical layer signaling that the first node continuously transmitted and no associated HARQ-ACK was detected.

As an embodiment, the first node is a ue, the physical layer signaling includes SCI (Sidelink Control Information), and the first physical layer signaling includes SCI.

As a sub-embodiment of the foregoing embodiment, the physical layer CHannel occupied by the first MAC PDU includes a PSSCH (physical Sidelink Shared CHannel).

As a sub-embodiment of the foregoing embodiment, the transmission CHannel occupied by the first MAC PDU includes SL-SCH (SideLink Shared CHannel).

As a sub-embodiment of the above embodiment, each Channel in the first set of channels is a PSFCH (physical Sidelink Feedback Channel).

As an embodiment, the first node is a base station device, the physical layer signaling includes DCI (Downlink Control Information), and the first physical layer signaling includes DCI.

As an embodiment, the physical layer signaling includes at least a portion of bits in a second identity that identifies a target recipient of the first MAC SDU.

As an embodiment, the sender of the physical layer signaling is identified by the second identity.

As an embodiment, the physical layer signaling includes at least part of bits in a first identity and at least part of bits in a second identity, and the first MAC header includes at least part of bits in the first identity and at least part of bits in the second identity.

As an embodiment, the number of consecutive HARQ DTX is the same as the number of PSFCHs for the first node that are not transmitted continuously by a second node, the second node being a target recipient of the first MAC SDU.

As one embodiment, the first Radio Bearer is a DRB (Data Radio Bearer).

As an embodiment, the first Radio Bearer is an SRB (signaling Radio Bearer).

As an embodiment, the first radio bearer, independent of whether the number of continuous HARQ DTX reaches the first threshold, comprises: the number of consecutive HARQ DTXs reaching the first threshold does not result in a release of the first radio bearer.

As an embodiment, the first radio bearer, independent of whether the number of continuous HARQ DTX reaches the first threshold, comprises: the first MAC SDU is transmitted on the first radio bearer regardless of whether the number of consecutive HARQ DTX's reaches the first threshold.

As one embodiment, when the Q is 0, the act of monitoring for a first type of HARQ-ACK on each channel in a first set of channels comprises: zero transmit power is maintained on each channel in the first set of channels.

As one embodiment, when the Q is 0, the act of monitoring for a first type of HARQ-ACK on each channel in a first set of channels comprises: forgoing monitoring for HARQ-ACK in the first set of channels.

As one embodiment, when the Q is 0, the act of monitoring for a first type of HARQ-ACK on each channel in a first set of channels comprises: a wireless signal is transmitted on at least one channel in a first set of channels.

As one embodiment, Q is a positive integer.

As an embodiment, the maximum value of Q is configurable.

As an example, the maximum value of Q does not exceed 64.

As an embodiment, the number of consecutive HARQ DTX's is updated from a current value to the current value plus 1 if the first receiver does not detect the first HARQ-ACK on all channels in the first set of channels.

As an embodiment, when the number of continuous HARQ DTX reaches the first threshold, the first MAC entity of the first node sends a first message to an upper layer of the first node, where the first message indicates that the number of continuous HARQ DTX reaches the first threshold.

As an embodiment, the upper layer includes an RRC (Radio Resource Control) layer.

For one embodiment, the upper layer includes an RLC layer.

As an embodiment, the upper layer includes a PDCP layer.

As an embodiment, the first MAC PDU is generated at the first MAC entity.

For one embodiment, the first threshold is configurable.

As one embodiment, the first threshold is a fixed constant.

As one embodiment, the first threshold is a positive integer.

As an example, the first threshold does not exceed 2 to the power of 16.

As one embodiment, the results of the behavior monitoring for a first HARQ-ACK on each channel of a first set of channels is used by the first node to determine whether to retransmit the first MAC PDU.

As an embodiment, when the number of continuous HARQ DTX reaches the first threshold, the Q is Q1; when the number of continuous HARQ DTX does not reach the first threshold, the Q is Q2; the Q1 is not greater than the difference of Q2 minus 1.

As an example, the difference between Q1 and Q2 minus 1 is equal.

As an example, the difference between the Q1 and the Q2 minus 1 is equal, and the Q1 channels are different from only one of the Q2 channels.

As an embodiment, the one different channel is a first channel.

As one embodiment, the Q2 channels include the Q1 channels.

As an embodiment, when the number of continuous HARQ DTX reaches the first threshold, the Q is Q1; when the number of continuous HARQ DTX does not reach the first threshold, the Q is Q2; the difference between the Q1 and the Q2 minus Q3 is equal, and the Q3 is a positive integer greater than 1.

As an embodiment, the first radio bearer is multicast and the Q3 is a number of target recipients of the first MAC PDU.

As an embodiment, whether the number of continuous HARQ DTX's reaches the first threshold is used to determine a first field in the first MAC header and a second field in the first physical layer signaling, the first field in the first MAC header and the second field in the first physical layer signaling indicating a destination of the first MAC PDU.

As an embodiment, the first physical layer signaling includes a first-stage (a first-stage) SCI format and a second-stage (a second-stage) SCI format.

As an embodiment, the scheduling information includes at least one of time domain resources or frequency domain resources of an occupied physical layer channel.

As one embodiment, the scheduling information includes at least one of MCS (Modulation and Coding Status), RV (Redundancy Version), NDI (New Data Indicator), and HARQ Process number (Process number).

As an embodiment, when the number of continuous HARQ DTX does not reach the first threshold, the first field in the first MAC header and the second field in the first physical layer signaling respectively comprise at least part of bits in a second identity; when the number of continuous HARQ DTXs reaches a first threshold, the first field in the first MAC header and the second field in the first physical layer signaling respectively comprise at least part of bits in a third identity.

As an embodiment, the first field in the first MAC header and the second field in the first physical layer signaling constitute the second identity or the third identity.

As an embodiment, the third field in the first MAC header and the fourth field in the first physical layer signaling respectively comprise at least part of bits in the first identity, regardless of whether the number of consecutive HARQ DTX's reaches the first threshold.

As an embodiment, the third field in the first MAC header and the fourth field in the first physical layer signaling constitute the first identity.

As an embodiment, the third field in the first MAC header and the fourth field in the first physical layer signaling indicate a transmission source of the first MAC PDU.

As an embodiment, the names of the first domain and the second domain are DST and Dest at 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 domain and the fourth domain are SRC and SourceID, respectively.

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

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

As one embodiment, the first identity indicates the first node.

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 respectively identify the first node, the second node, and the third node in the present application.

As an embodiment, the first identity, the second identity and the third identity are each a link layer identity; any two of the first identity, the second identity and the third identity are different.

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

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

Example 2

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

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

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

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

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

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

As an embodiment, the first node, the second node and the third node in the present application are the NR node B, UE201 and the 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 wireless 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 the downlink.

As an embodiment, the UE201 supports relay transmission.

As an embodiment, the UE241 supports relay transmission.

As an example, the gNB203 is a macro cellular (MarcoCellular) base station.

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

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

As an example, the gNB203 is a flight platform device.

As an embodiment, the gNB203 is a satellite device.

Example 3

Embodiment 3 illustrates a schematic diagram of an embodiment of a radio protocol architecture of a user plane and a control plane according to the present application, as shown in fig. 3. Fig. 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, fig. 3 showing the radio protocol architecture for the control plane 300 between a first node 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 PHY 301. 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 two UEs, through PHY 301. The L2 layer 305 includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the second node (or the 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 packets, retransmission of missing packets by ARQ, and the RLC sublayer 303 also provides duplicate 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 between the first nodes. The MAC sublayer 302 is also responsible for HARQ (Hybrid Automatic Repeat Request) operations. The RRC sublayer 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), the radio protocol architecture in the user plane 350 for the first node and the second node (or third node) is substantially the same for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355 as the corresponding layers and sublayers in the control plane 300, but the PDCP sublayer 354 also provides header compression for upper layer packets to reduce radio transmission overhead. The L2 layer 355 in the user plane 350 further includes an SDAP (Service Data Adaptation Protocol) sublayer 356, and the SDAP sublayer 356 is responsible for mapping between QoS (quality of Service) streams and Data Radio Bearers (DRBs) to support diversity of services. Although not shown, the first node may have several upper layers above the L2 layer 355, 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., far end UE, server, etc.).

As an embodiment, the entities of the multiple sub-layers of the control plane in fig. 3 constitute an SRB (Signaling Radio bearer) in the vertical direction.

As an embodiment, entities of the 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 message in this application is generated in the MAC 302.

As an embodiment, the first message in this application is generated in the MAC 352.

As an embodiment, the second message in this application is generated in the RRC 306.

As an embodiment, the first physical layer signaling in the present application is generated in the PHY301 or the PHY 351.

As an embodiment, the physical layer signaling in the present application is generated in the PHY301 or the PHY 351.

As an embodiment, the first MAC pdu in the present application is generated in the MAC352 or the MAC 302.

As an embodiment, the first MAC PDU and the fourth MAC PDU in the present application are generated in the same MAC entity.

As an embodiment, the third MAC PDU in the present application is generated in the MAC352 or the MAC 302.

As an embodiment, the first RLC PDU in the present application is generated in the RLC 303.

As an embodiment, the fifth MAC PDU in the present application is generated in the MAC 302.

As an example, the

L2 layer

305 or 355 belongs to a higher layer.

As an embodiment, the RRC sublayer 306 in the L3 layer belongs to a higher layer.

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

As an embodiment, 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 and the MAC sublayer.

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

Some of the embodiments described above avoid the increase in signalling overhead that would be incurred by a third node to establish/maintain a higher layer connection; further, the above embodiment can realize that the third node joins and exits the relay operation quickly, thereby reducing the delay and improving the transmission robustness.

Example 4

Embodiment 4 shows a hardware module schematic diagram 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 communications device 450 includes a controller/processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter/receiver 454, and an antenna 452.

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

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

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

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

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

As an embodiment, the first communication device 450 apparatus includes: at least one processor and at least one memory including computer program code; the at least one memory and the computer program code configured to, for use with the at least one processor, the first communication device 450 apparatus at least: sending a first physical layer signaling and a first MAC PDU through an air interface, wherein the first MAC PDU comprises a first MAC header and a first MAC SDU; monitoring for a first HARQ-ACK on each channel in a first set of channels, the first HARQ-ACK indicating whether the first MAC PDU was decoded correctly; wherein the first physical layer signaling comprises scheduling information of the first MAC PDU; the first set of channels comprises Q channels, the Q being a non-negative integer; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

As an embodiment, the first communication device 450 includes: a memory storing a program of computer readable instructions that when executed by at least one processor result in actions comprising: sending a first physical layer signaling and a first MAC PDU through an air interface, wherein the first MAC PDU comprises a first MAC header and a first MAC SDU; monitoring for a first HARQ-ACK on each channel in a first set of channels, the first HARQ-ACK indicating whether the first MAC PDU was decoded correctly; wherein the first physical layer signaling comprises scheduling information of the first MAC PDU; the first set of channels comprises Q channels, the Q being a non-negative integer; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

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 physical layer signaling through an air interface, and detecting a first MAC PDU through the air interface, wherein the first MAC PDU comprises a first MAC head and a first MAC SDU; sending the first HARQ-ACK on a first channel in the first channel set, or abandoning sending the first HARQ-ACK; wherein the first set of channels includes Q channels, and Q is a non-negative integer; whether to send the first HARQ-ACK is related to the Q, the first set of channels being reserved for the first HARQ-ACK, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly; the first physical layer signaling comprises scheduling information of the first MAC PDU; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

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 result in actions comprising: receiving a first physical layer signaling through an air interface, and detecting a first MAC PDU through the air interface, wherein the first MAC PDU comprises a first MAC head and a first MAC SDU; sending the first HARQ-ACK on a first channel in the first channel set, or abandoning sending the first HARQ-ACK; wherein the first set of channels includes Q channels, and Q is a non-negative integer; whether to send the first HARQ-ACK is related to the Q, the first set of channels being reserved for the first HARQ-ACK, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly; the first physical layer signaling comprises scheduling information of the first MAC PDU; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

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 physical layer signaling through an air interface, and detecting a first MAC PDU through the air interface, wherein the first MAC PDU comprises a first MAC head and a first MAC SDU; monitoring for a first HARQ-ACK on a first channel of a first set of channels; or, abandoning monitoring the first HARQ-ACK; transmitting a first HARQ-ACK on one channel in a first set of channels; wherein the first set of channels includes Q channels, and Q is a non-negative integer; whether to monitor the first HARQ-ACK is related to the Q, the first set of channels being reserved for the first HARQ-ACK, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly; the first physical layer signaling comprises scheduling information of the first MAC PDU; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

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 result in actions comprising: receiving a first physical layer signaling through an air interface, and detecting a first MAC PDU through the air interface, wherein the first MAC PDU comprises a first MAC head and a first MAC SDU; monitoring for a first HARQ-ACK on a first channel of a first set of channels; or, abandoning monitoring the first HARQ-ACK; transmitting a first HARQ-ACK on one channel in a first set of channels; wherein the first set of channels includes Q channels, and Q is a non-negative integer; whether to monitor the first HARQ-ACK is related to the Q, the first set of channels being reserved for the first HARQ-ACK, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly; the first physical layer signaling comprises scheduling information of the first MAC PDU; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

For one 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.

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

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

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

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

Example 5

Embodiment 5 illustrates a transmission flow chart among a first node, a second node and a third node according to an embodiment of the present application, as shown in fig. 5. In fig. 5, the steps in block F1, block F2, and block F3 are optional, respectively, wherein step S200 is optional in the step in block F1.

For theFirst node U1Sending a second message over the air interface in step S100, the second message being used to determine that the first set of channels does not include a first channel; in step S101, a first physical layer signaling and a first MAC PDU are sent over an air interface, where the first MAC PDU includes a first MAC header and a first MAC SDU; monitoring in step S102 a first HARQ-ACK on each channel of a first set of channels, the first HARQ-ACK indicating whether the first MAC PDU was decoded correctly; receiving a fifth mac pdu over the air interface in step S103; and if the first RLC PDU indicates that the RLC SDU carried by the first MAC SDU has reached the maximum retransmission times, releasing the first radio bearer.

For theSecond node U2Receiving the second message over an air interface in step S200;receiving the first physical layer signaling and detecting the first MAC PDU over an air interface in step S201; in step S202, a first HARQ-ACK is transmitted on a first channel of a first set of channels, or transmission of the first HARQ-ACK is abandoned, wherein whether the first HARQ-ACK is transmitted or not is related to the Q; transmitting a fifth MAC PDU over the air interface in step S203;

for theThird node U3Receiving the second message over an air interface in step S300; receiving the first physical layer signaling and detecting the first MAC PDU over an air interface in step S301; monitoring for a first HARQ-ACK on a first channel of a first set of channels or abstaining from monitoring for a first HARQ-ACK in step 302, wherein whether or not monitoring for the first HARQ-ACK is related to the Q; a first HARQ-ACK is sent on one channel of the first set of channels in step 303.

In embodiment 5, the first physical layer signaling includes scheduling information of the first MAC PDU; the first set of channels comprises Q channels, the Q being a non-negative integer; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

As an embodiment, the second message received in the step S200 is sent directly by the first node U1, as indicated by arrow a 0.

As an embodiment, the second message received in the step S200 is relayed to the second node U2 by the third node U3 after receiving the second message sent by the first node U1 in the step S300.

As an embodiment, the second message is sent to the second node U2 only by the first node U1, i.e. the step S200 does not exist.

As one embodiment, the step in block F1 is not present; when the number of continuous HARQ DTXs does not reach the first threshold, a first field in the first MAC header and a second field in the first physical layer signaling jointly indicate a second identity; when the number of continuous HARQ DTXs reaches the first threshold, a first field in the first MAC header and a second field in the first physical layer signaling together indicate a third identity; the first field in the first MAC header and the second field in the first physical layer signaling indicate a destination of the first MAC PDU.

As a sub-embodiment of the above embodiment, the step in block F2 is performed only if the number of consecutive HARQ DTX's does not reach the first threshold, i.e. the second node U2 does not receive the first physical layer signaling and the first MAC PDU destined for the third identity.

As an embodiment, when the number of continuous HARQ DTX's does not reach the first threshold, the first channel is reserved for use by the second node U2; when the number of continuous HARQ DTXs reaches the first threshold, the first set of channels does not include the first channel.

As a sub-embodiment of the above embodiment, the first set of channels comprises a second channel, which is reserved for the third node U3.

As an embodiment, an advantage of the above method is that HARQ-ACK channels reserved for relay nodes and remote nodes are fixed and do not vary depending on whether the number of consecutive HARQ DTX's reaches the first threshold, improving robustness.

As an embodiment, when the number of continuous HARQ DTX does not reach the first threshold, the second channel is reserved to the third node U3, the first channel is reserved to the second node U2; when the number of continuous HARQ DTX reaches the first threshold, the first channel is reserved for the third node U3, the first set of channels does not include the second channel.

As a sub-embodiment of the foregoing embodiment, according to the positioning of the PSFCH in the existing 3GPP Release 16 specification, the time-frequency position of the PSSCH occupied by the first MAC PDU is used to determine the time-frequency resource of the first channel.

As an embodiment, an advantage of the foregoing embodiment is that the existing association relationship between the psch and the PSFCH can be reused as much as possible, better compatibility is maintained, and HARQ-ACK feedback delay is reduced.

As an embodiment, the time domain resources occupied by the first channel in the second channel are orthogonal.

For one embodiment, the first channel precedes the second channel.

As an embodiment, any two of the Q2 channels are reserved for different communication nodes to send the first HARQ-ACK.

As an embodiment, Q is greater than 2, and time domain resources occupied by any two of the Q channels are orthogonal.

As an embodiment, the second message is triggered in response to the number of continuous HARQ DTX's reaching the first threshold; in response to receiving the second message, the second node U2 abandons sending the first HARQ-ACK in step S202.

As an embodiment, the second message is sent by the first node U1 when the number of continuous HARQ DTX reaches the first threshold.

As an embodiment, the number of consecutive HARQ DTX is the number of consecutive unsent PSFCHs by the second node U2 as monitored by the first node U1.

For one embodiment, the detecting the first MAC PDU includes channel estimation, channel equalization, and channel decoding.

For one embodiment, the detecting the first MAC PDU includes CRC (Cyclic Redundancy Check) validation; if the CRC verification is passed, considering that the first MAC PDU is correctly decoded; if not, the first MAC PDU is deemed to have not been decoded correctly.

As one embodiment, the receiving the first physical layer signaling includes channel estimation, channel equalization, and channel decoding.

As one embodiment, the receiving the first physical layer signaling includes passing CRC validation.

For one embodiment, monitoring for a first HARQ-ACK on a channel includes determining whether the first HARQ-ACK is transmitted based on an energy detection; if not sent, it is determined to be HARQ DTX.

For one embodiment, monitoring for a first HARQ-ACK on a channel includes determining whether the first HARQ-ACK was transmitted based on signature sequence monitoring; if not sent, it is determined to be HARQ DTX.

As an embodiment, monitoring the first HARQ-ACK on one channel comprises signature sequence monitoring for ACK and NACK with different local sequences, respectively.

As one embodiment, the signature sequence monitoring includes coherent detection.

As one embodiment, the signature sequence monitoring includes non-coherent detection.

As an embodiment, the time-frequency Resource occupied by the first MAC PDU belongs to a Resource Pool (Resource Pool).

As an embodiment, all channels in the first set of channels belong to a Resource Pool (Resource Pool).

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

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

As an embodiment, the time-frequency resource occupied by each channel in the first set of channels is predefined.

As an embodiment, the first node U1 sends higher layer signaling to configure the time-frequency resource occupied by each channel in the first channel set.

As an embodiment, the time-frequency resources occupied by each channel in the first set of channels are associated to the time-frequency resources occupied by the first MAC PDU.

As an embodiment, when Q is greater than 1, all channels in the first channel set occupy the same frequency domain resource, and time domain resources occupied by any two channels in the first channel set are different.

As an embodiment, the starting sub-channel occupied by the psch of the first MAC PDU is mapped to any one of the same frequency domain resources.

As an embodiment, the method for determining any one of the same frequency domain resources refers to section 16.3 of 3GPP standard TS 38.213.

As an embodiment, when Q is greater than 1, a slot occupied by one channel closest to a time domain resource of the pscch of the first MAC PDU in the first channel set is a first slot, and the first slot is a closest slot, of slots configured as a PSFCH, whose distance from a last slot occupied by the pscch of the first MAC PDU is not less than a first integer.

As an embodiment, when Q is greater than 1, the time slots occupied by Q-1 channels other than the one channel closest to the time domain resource of the pscch of the first MAC PDU in the first channel set are Q-1 time slots closest to the first time slot in the time slot configured as a PSFCH and after the first time slot.

As an embodiment, the time slot configured as a PSFCH is indicated by period psfchreresource.

For one embodiment, the first integer is indicated by MinTimeGapPSFCH.

As an embodiment, when Q is greater than 1, a time interval between a time slot occupied by Q-1 channels outside the one channel closest to the time domain resource of the pscch of the first MAC PDU in the first channel set and the first time slot is indicated by the first physical layer signaling.

As an embodiment, when Q is greater than 1, the number of RBs (Resource blocks ) spaced between RBs occupied by Q-1 channels other than the one channel closest to the time domain Resource of the pscch of the first MAC PDU in the first channel set and RBs occupied by the one channel closest to the time domain Resource of the pscch of the first MAC PDU in the first channel set is indicated by the first physical layer signaling.

As an embodiment, Q-1 is 1, and the one channel closest to the time domain resource of the psch of the first MAC PDU in the first channel set is the first channel.

As an embodiment, the number of consecutive HARQ DTX's does not reach the first threshold, the third node U3 monitors the first HARQ-ACK on the first channel of the first set of channels and the detected first HARQ-ACK is an ACK; the first HARQ-ACK sent by the third node on the one of the first set of channels is an ACK regardless of whether the first MAC PDU was decoded correctly by the third node.

As an embodiment, the above embodiment has advantages in that: when the first node U1 misses the ACK sent by the second node U2, the first node U1 can also avoid retransmitting the first MAC PDU according to the ACK sent by the third node U3; HARQ retransmissions are minimized.

For one embodiment, the first node U1 receives a fifth MAC PDU over the air interface in step S103, the fifth MAC PDU comprising a first RLC PDU; if the first RLC PDU indicates that the RLC SDU carried by the first MAC SDU has reached the maximum retransmission times, releasing the first radio bearer; wherein the first RLC PDU indicates whether the RLC SDU carried by the first MAC SDU is received.

For one embodiment, the second node U2 sends a fifth MAC PDU over the air interface at step S203, the fifth MAC PDU comprising the first RLC PDU; wherein the first RLC PDU indicates whether the RLC SDU carried by the first MAC SDU is received.

As an embodiment, the first MAC PDU includes at least part of bits in the first identity and at least part of bits in the second identity.

As an embodiment, when the number of continuous HARQ DTX does not reach the first threshold, the fifth MAC PDU comprises at least part of bits in the first identity and at least part of bits in the second identity; when the number of continuous HARQ DTX does not reach the first threshold, the fifth MAC PDU comprises at least a portion of bits in the first identity and at least a portion of bits in a third identity.

As an embodiment, when the number of continuous HARQ DTX's does not reach the first threshold, the second message indicates that the fifth MAC PDU includes at least part of the bits in the first identity and at least part of the bits in a third identity.

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

As an embodiment, one channel included in the first set of channels is reserved for a third node, and the third node is identified by the third identity.

As an embodiment, the first RLC PDU is an RLC control PDU.

For one embodiment, the first RLC PDU is a STATUS PDU.

As an embodiment, the second Information includes rrcreeconfigurationsidelink IE (Information Element).

Example 6

Embodiment 6 illustrates a flowchart of retransmission of a first MAC SDU according to an embodiment of the present application, as shown in fig. 6.

For theFirst node U1In step S105, monitoring a first HARQ-ACK on each channel in a first set of channels, and determining whether to retransmit the first MAC PDU according to a detection result in the first set of channels;

for theSecond node U2Receiving the first physical layer signaling over an air interface and failing to do so in step S205Correctly decoding the first MAC PDU; transmitting a NACK on a first channel of the first set of channels in step S206; receiving a fourth MAC PDU over the air interface in step S207;

for theThird node U3Receiving the first physical layer signaling and the first MAC PDU over an air interface in step S305; detecting the NACK on the first channel of the first set of channels and sending an ACK on one of the first set of channels in step 306; transmitting the fourth MAC PDU over an air interface in step S307;

in embodiment 6, the fourth MAC PDU includes a fourth MAC header and the first MAC SDU; the number of continuous HARQ DTX's does not reach the first threshold, the Q is greater than 1, at least one of the Q channels is reserved for the third node U3 to send the first HARQ-ACK; the second node U2 is the intended recipient of the first MAC PDU and the third node U3 is not the intended recipient of the first MAC PDU.

As an embodiment, the first field and the third field in the fourth MAC header respectively include a partial bit in the second identity and a partial bit in the third identity; the fourth MAC PDU is scheduled by second physical layer signaling sent by the third node U3 to the second node U2, and a second domain and a fourth domain in the second physical layer signaling comprise partial bits in the second identity and partial bits in the third identity, respectively.

For one embodiment, the first node U1 abandons retransmission of the first MAC PDU over the air interface when an ACK for the first MAC PDU is detected on any one of the first set of channels; the first node U1 retransmitting the first MAC PDU over an air interface when no ACK for the first MAC PDU is detected on all channels in the first set of channels; wherein the number of continuous HARQ DTXs does not reach the first threshold, the Q is greater than 1, and at least one of the Q channels is reserved for a communication node other than the second node U2 to transmit the first HARQ-ACK.

As a sub-embodiment of the above embodiment, the third node U3 monitors the first HARQ-ACK on the first channel of the first set of channels and the detected first HARQ-ACK is an ACK; the first HARQ-ACK sent by the third node on the one of the first set of channels is an ACK regardless of whether the first MAC PDU was decoded correctly by the third node.

For one embodiment, the first node U1 abandons retransmission of the first MAC PDU over an air interface when an ACK for the first MAC PDU is detected on the first channel of the first set of channels; the first node U1 retransmitting the first MAC PDU over an air interface when no ACK is detected for the first MAC PDU on the first channel of the first set of channels; wherein the number of continuous HARQ DTXs does not reach the first threshold, the Q is greater than 1, and at least one of the Q channels is reserved for a communication node other than the second node U2 to transmit the first HARQ-ACK.

As an embodiment, when the first MAC PDU is transmitted, the number of continuous HARQ DTX does not reach the first threshold, and Q is greater than 1.

As one embodiment, the behavior aborting retransmission of the first MAC PDU includes releasing a Buffer (Buffer) occupied by the first MAC PDU.

As one embodiment, the act of foregoing retransmission of the first MAC PDU includes deciding, by an RLC layer of the first node, whether to retransmit the first MAC SDU.

As one embodiment, the phrase not detecting an ACK for the first MAC PDU comprises: the first HARQ-ACK is not detected.

As one embodiment, the phrase not detecting an ACK for the first MAC PDU comprises: detecting a NACK for the first MAC PDU.

As an embodiment, a third domain in the first MAC header is different from a third domain in the fourth MAC header, the third domain in the first MAC header and the third domain in the fourth MAC header being used to indicate the first node U1 and the third node U3, respectively.

Example 7

Embodiment 7 illustrates a schematic diagram of a protocol architecture of relay transmission according to an 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 the example that data is sent to the second node by the first node (data is sent to the first node by the second node and is obtained by the same way): the first target data is processed by the PDCP sublayer 6102 and the RLC sublayer 6103 in sequence at the first node side to generate a first target MAC PDU in the MAC layer 6104, then transferred to the PHY layer 6105, transferred to the PHY layer 6201 of the third node via the air interface, and then processed by the MAC layer 6203 and the RLC sublayer 6205 in sequence to recover the first RLC data; the first RLC data is recombined into second RLC data (optional) in the RLC sublayer 6205, and a second target MAC PDU is generated after being processed by the MAC sublayer 6204 and transmitted to the PHY layer 6202; and then the second target data is transmitted to a PHY layer 6305 of the second node through an air interface, and then the second target MAC PDU is restored through MAC6304 in sequence, and then the second target data is restored through the processing of the RLC sublayer 6303 and the PDCP sublayer 6302 in sequence.

As an example, the RLC sublayer 6205 may not perform data segmentation on RLC SDUs.

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

As an embodiment, the RLC sublayer 6205 may perform data combination on the RLC SDU.

As an embodiment, the RLC sublayer 6205 performs no data combination or data segmentation on the RLC SDU, and performs only storage, forwarding and retransmission when necessary; the second RLC data is the same as the first RLC data.

As an embodiment, the first target MAC PDU and the second target MAC PDU are the first MAC PDU and the fourth MAC PDU, respectively.

For one embodiment, the first target data is generated at the RRC/SDAP6101 and the second target data is passed to the RRC/SDAP 6301.

As an embodiment, the first target MAC PDU and the second target MAC PDU carry the second message, respectively.

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/SDAP6101 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.

As an embodiment, a fifth MAC PDU is sent by the second node to the first node through a third node.

For one embodiment, the second node sends a fifth MAC PDU to the third node over the air interface; the third node forwards the fifth MAC PDU to the first node, wherein the fifth MAC PDU comprises a first RLC PDU; if the first RLC PDU indicates that the RLC SDU carried by the first MAC SDU has reached the maximum retransmission times, the first node releases the first radio bearer; wherein the first RLC PDU indicates whether the RLC SDU carried by the first MAC SDU is received.

Example 8

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

In example 8, an identity comprises a first part and a second part.

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 number of bits comprised by the second part is twice the number of bits comprised by the second part.

As an embodiment, the second part is carried by a 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 an embodiment, the one identity is any one of the first identity, the second identity and the third identity.

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

As an embodiment, when said one identity is used for identifying a destination node, said one identity is divided into said first part and said second part.

Example 9

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

In example 9, an identity comprises a third portion and a fourth portion.

As an embodiment, the number of bits included in the third portion and the number of bits included in the fourth portion are positive integer multiples of 8.

As an embodiment, the number of bits comprised by the third portion is twice the number of bits comprised by the fourth portion.

As an embodiment, the fourth part is carried by a 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).

For one embodiment, the leftmost bit of the identity in FIG. 9 is the most significant bit and the rightmost bit is the least significant bit.

As an embodiment, when said one identity is used for identifying a source node, said one identity is divided into said third part and said fourth part.

Example 10

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

In embodiment 10, one MAC PDU includes one MAC Header and at least one MAC sub-PDU (sub-PDU); the MAC header includes a source identity, a destination identity, and other bits.

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

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

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

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

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

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

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

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

For one embodiment, the LCID field includes 5 bits.

For one embodiment, the LCID field includes 6 bits.

As an example, the MAC PDU in fig. 10 is the first MAC PDU in this application.

As a sub-embodiment of the foregoing embodiment, the channel identity of the first logical channel in this application is an LCID included in a MAC subheader of any MAC sub-PDU in the first MAC PDU.

As an example, the MAC PDU in fig. 10 is the second MAC PDU in this application.

As an example, the MAC PDU in fig. 10 is the target MAC PDU in this application.

Example 11

Embodiment 11 illustrates a flowchart of determining whether to listen for the first HARQ-ACK on the first channel according to the first physical layer signaling according to an embodiment of the present application, as shown in fig. 11. The steps in fig. 11 are performed in the second node.

The second node receives the first physical layer signaling in step S1101; determining whether the first physical layer signaling includes a partial bit of the second identity in step S1102; if yes, decoding the first MAC PDU as a relay node in step S1103, monitoring a first HARQ-ACK on a first channel in the first channel set, and then sending the first HARQ-ACK on one channel in the first channel set in step S1106; if not, in step S1104, abandoning monitoring the first HARQ-ACK on the first channel in the uoshu first channel set, and determining whether the first physical layer signaling includes a partial bit of the third identity, if so, decoding the first MAC PDU as a target recipient in step S1105; if not, the step S1106 is executed.

As an embodiment, the method avoids using the second information to notify the second node and the third node whether the number of the continuous HARQ DTX reaches the first threshold, reduces signaling overhead, and improves transmission efficiency.

Example 12

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

The first transmitter 1201 transmits a first physical layer signaling and a first MAC PDU over an air interface, the first MAC PDU including a first MAC header and a first MAC SDU; the first receiver 1202 monitors each channel in a first set of channels for a first HARQ-ACK indicating whether the first MAC PDU was decoded correctly;

in embodiment 12, the first physical layer signaling includes scheduling information of the first MAC PDU; the first set of channels comprises Q channels, the Q being a non-negative integer; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

As an embodiment, the first transmitter 1201, when the number of continuous HARQ DTX reaches the first threshold, transmits a second message over an air interface; wherein the second message is used to determine that the first set of channels does not include a first channel.

For an embodiment, the first receiver 1202 receives a second MAC PDU over an air interface after the time domain resource occupied by the first channel set, where the second MAC PDU includes a second MAC header and a second MAC SDU; monitoring for a second HARQ-ACK on each channel in a second set of channels, the second HARQ-ACK indicating whether a third MAC PDU was decoded correctly; the first transmitter 1201 transmits a third MAC PDU over an air interface, where the third MAC PDU includes a third MAC header and a third MAC SDU; wherein the number of consecutive HARQ DTX reaches the first threshold; the second MAC PDU is used to determine that the second set of channels includes Q2 channels, the third MAC PDU being transmitted over the first radio bearer.

As an embodiment, the second MAC PDU is transmitted over the first radio bearer.

As an embodiment, the first radio bearer is a DRB, and the second MAC PDU is transmitted through an SRB.

As an embodiment, the second MAC PDU is transmitted after the second message.

As an embodiment, the first node is characterized by comprising:

the first transmitter 1201 transmits a third message;

wherein the third message is used to determine that the Q2 channels are included in the second set of channels.

As an embodiment, the first node is characterized in that the first field is included in the third MAC header, and the first field in the third MAC header is used to determine that the Q2 channels are included in the second set of channels.

As an embodiment, the first node is characterized in that the first field is included in the third MAC header, and when the first field in the third MAC header includes at least part of bits in a third identity, the Q2 channels are included in the second channel set; the Q2 channels are included in the second set of channels when the first field in the third MAC header includes at least some bits in a second identity.

As an embodiment, the second MAC PDU is used to trigger the third message.

For one embodiment, the first transmitter 1201, upon detecting an ACK for the first MAC PDU on any channel in the first set of channels, foregoes retransmission of the first MAC PDU over an air interface; retransmitting the first MAC PDU over an air interface when no ACK for the first MAC PDU is detected on all channels in the first set of channels; wherein the number of continuous HARQ DTXs does not reach the first threshold, the Q is greater than 1, and at least one of the Q channels is reserved for transmitting the first HARQ-ACK by a communication node other than a target receiver of the first MAC PDU.

For one embodiment, the first receiver 1202 receives a fifth MAC PDU over an air interface, the fifth MAC PDU comprising a first RLC PDU; if the first RLC PDU indicates that the RLC SDU carried by the first MAC SDU has reached the maximum retransmission times, releasing the first radio bearer; wherein the first RLC PDU indicates whether the RLC SDU carried by the first MAC SDU is received.

For one embodiment, the first node 1200 is a user equipment.

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

The first transmitter 1201 includes, for one embodiment, the antenna 452, the transmitter/receiver 454, the multi-antenna transmitter processor 457, the transmit processor 468, the controller/processor 459, the memory 460, and the data source 467 of fig. 4 of the present application.

For one embodiment, the first receiver 1202 may include 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.

For one embodiment, the first receiver 1202 may include 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.

Example 13

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

The second receiver 1301 receives a first physical layer signaling through an air interface, and detects a first MAC PDU through the air interface, where the first MAC PDU includes a first MAC header and a first MAC SDU; the second transmitter 1302 sending the first HARQ-ACK on the first channel of the first set of channels, or, abstaining from sending the first HARQ-ACK; wherein the first set of channels includes Q channels, and Q is a non-negative integer; whether to send the first HARQ-ACK is related to the Q, the first set of channels being reserved for the first HARQ-ACK, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly; the first physical layer signaling comprises scheduling information of the first MAC PDU; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

For one embodiment, the second receiver 1301 receives a second message over an air interface;

For an embodiment, the second transmitter 1302 transmits a second MAC PDU over an air interface after the time domain resource occupied by the first channel set, where the second MAC PDU includes a second MAC header and a second MAC SDU; transmitting a second HARQ-ACK on one channel in a second set of channels, the second HARQ-ACK indicating whether a third MAC PDU was decoded correctly; the second receiver 1301 receives a third MAC PDU over an air interface, where the third MAC PDU includes a third MAC header and a third MAC SDU; wherein the number of consecutive HARQ DTX reaches the first threshold; the second MAC PDU is used to determine that the second set of channels includes Q2 channels; the third MAC PDU is transmitted over the first radio bearer.

For one embodiment, the second receiver 1301 receives a fourth MAC PDU over an air interface, where the fourth MAC PDU includes a fourth MAC header and the first MAC SDU; wherein the number of continuous HARQ DTX does not reach the first threshold, the Q is greater than 1, at least one of the Q channels is reserved for the sender of the fourth MAC PDU to send the first HARQ-ACK; the second node is a target recipient of the first MAC PDU and the sender of the fourth MAC PDU is not a target recipient of the first MAC PDU; the sender of the fourth MAC PDU sends a first HARQ-ACK in the first set of channels indicating correct decoding of the first MAC PDU.

For one embodiment, the second transmitter 1302 transmits a fifth MAC PDU over the air interface, the fifth MAC PDU comprising the first RLC PDU; wherein the first RLC PDU indicates whether the RLC SDU carried by the first MAC SDU is received.

The second receiver 1301, receives a third message;

As an embodiment, the second MAC PDU is used to trigger the third message.

For one embodiment, the second node 1300 is a user equipment.

For one embodiment, the second transmitter 1302 includes the antenna 420, the transmitter 418, the transmit processor 416, and the controller/processor 475.

For one embodiment, the second transmitter 1302 includes the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416, and the controller/processor 475.

For one embodiment, the second receiver 1301 includes the antenna 420, the receiver 418, the multi-antenna receive processor 472, the receive processor 470, and the controller/processor 475.

For one embodiment, the second receiver 1301 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 an 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 receiver 1401 receives a first physical layer signaling over an air interface, detects a first MAC PDU over the air interface, the first MAC PDU comprising a first MAC header and a first MAC SDU; monitoring for a first HARQ-ACK on a first channel of a first set of channels; or, abandoning monitoring the first HARQ-ACK; the third transmitter 1402 sends a first HARQ-ACK on one channel of the first set of channels;

in embodiment 14, the first set of channels includes Q channels, and Q is a non-negative integer; whether to monitor the first HARQ-ACK is related to the Q, the first set of channels being reserved for the first HARQ-ACK, the first HARQ-ACK indicating whether the first MAC PDU is decoded correctly; the first physical layer signaling comprises scheduling information of the first MAC PDU; whether the number of consecutive HARQ DTX reaches a first threshold is used to determine the Q; the first MAC SDU is transmitted over a first radio bearer independent of whether the number of continuous HARQ DTX's reaches the first threshold.

As an embodiment, at least the former of the second field in the first physical layer signaling and the first field in the first MAC header indicating the destination of the first MAC PDU is used to determine whether the number of continuous HARQ DTX's reaches the first threshold.

For one embodiment, the third receiver 1401 receives a second message over an air interface;

As an embodiment, the number of consecutive HARQ DTX's does not reach the first threshold, the third node monitors the first HARQ-ACK on the first channel of the first set of channels and the detected first HARQ-ACK is an ACK; the first HARQ-ACK sent by the third node on the one of the first set of channels is an ACK regardless of whether the first MAC PDU was decoded correctly by the third node.

For one embodiment, the third transmitter 1402 transmits a fourth MAC PDU over an air interface, the fourth MAC PDU including a fourth MAC header and the first MAC SDU;

For one embodiment, the third receiver 1401 receives a third MAC PDU over the air interface, the third MAC PDU comprising a third MAC header and a third MAC SDU; monitoring for a second HARQ-ACK on a channel of the second set of channels; the third transmitter 1402 sends a second HARQ-ACK on another channel of the second set of channels; wherein the second HARQ-ACK indicates whether a third MAC PDU is decoded correctly, and the number of continuous HARQ DTX reaches the first threshold; the second MAC PDU is used to determine that the second set of channels includes Q2 channels; the third MAC PDU is transmitted over the first radio bearer; the second MAC PDU is sent over an air interface after the time domain resources occupied by the first set of channels, the second MAC PDU including a second MAC header and a second MAC SDU;

the third receiver 1401, receiving a third message;

As an embodiment, the second MAC PDU is used to trigger the third message.

Example 15

Embodiment 15 illustrates a schematic diagram of determining the second channel set according to the second MAC PDU according to an embodiment of the present application, as shown in fig. 15.

In embodiment 15, a first node receives, through an air interface, a second MAC PDU after a time domain resource occupied by the first channel set, where the second MAC PDU includes a second MAC header and a second MAC SDU; then sending a third MAC PDU through an air interface, wherein the third MAC PDU comprises a third MAC header and a third MAC SDU; then monitoring a second HARQ-ACK on each channel in a second set of channels, the second HARQ-ACK indicating whether a third MAC PDU is decoded correctly;

the second node sends a second MAC PDU through an air interface after the time domain resource occupied by the first channel set, wherein the second MAC PDU comprises a second MAC head and a second MAC SDU; then receiving a third MAC PDU through an air interface, wherein the third MAC PDU comprises a third MAC header and a third MAC SDU; then sending a second HARQ-ACK on one channel in a second channel set, wherein the second HARQ-ACK indicates whether the third MAC PDU is decoded correctly or not;

in embodiment 15, the first set of channels includes only channel # 1; the number of consecutive HARQ DTX reaches the first threshold; the second MAC PDU is used by at least the first node of the first and second nodes to determine that the second set of channels includes 2 channels, channel #2 and channel # 3; the third MAC PDU is transmitted over the first radio bearer.

As an example, the channel #2 and the channel #3 are reserved for the second node and the third node, respectively.

As an example, the second set of channels includes only one channel if the second MAC PDU is not transmitted over the air interface.

As an embodiment, the one channel in the second set of channels is the channel # 2.

As an embodiment, the one channel in the second set of channels is the channel # 3.

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

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

Claims

1. A first node for wireless communication, comprising:

2. The first node of claim 1 comprising, whether the number of continuous HARQ DTXs reaches the first threshold is used to determine a first field in the first MAC header and a second field in the first physical layer signaling, the first field in the first MAC header and the second field in the first physical layer signaling indicating a destination of the first MAC PDU.

3. The first node of claim 1, comprising:

the first transmitter, when the number of the continuous HARQ DTX reaches the first threshold, transmitting a second message through an air interface;

4. The first node according to any of claims 1-3, comprising, when the number of continuous HARQ DTXs reaches the first threshold, the Q is Q1; when the number of continuous HARQ DTX does not reach the first threshold, the Q is Q2; the Q1 is not greater than the difference of Q2 minus 1.

5. The first node of claim 4, comprising:

the first receiver receives a second MAC PDU through an air interface after the time domain resource occupied by the first channel set, where the second MAC PDU includes a second MAC header and a second MAC SDU; monitoring for a second HARQ-ACK on each channel in a second set of channels, the second HARQ-ACK indicating whether a third MAC PDU was decoded correctly;

the first transmitter transmits a third MAC PDU over an air interface, the third MAC PDU including a third MAC header and a third MAC SDU;

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

a first transmitter to forgo retransmission of the first MAC PDU over an air interface when an ACK for the first MAC PDU is detected on any one of the first set of channels; retransmitting the first MAC PDU over an air interface when no ACK for the first MAC PDU is detected on all channels in the first set of channels;

7. The first node according to any of claims 1 to 6, comprising:

the first receiver receives a fifth MAC PDU through an air interface, wherein the fifth MAC PDU comprises a first RLC PDU; if the first RLC PDU indicates that the RLC SDU carried by the first MAC SDU has reached the maximum retransmission times, releasing the first radio bearer;

8. A second node for wireless communication, comprising:

a second transmitter, configured to send a first HARQ-ACK on a first channel in the first set of channels, or to forgo sending the first HARQ-ACK;

9. A third node for wireless communication, comprising:

10. The third node according to claim 9, characterized in that the number of continuous HARQ DTX's does not reach the first threshold, the third node monitors the first HARQ-ACK on the first channel of the first set of channels and the detected first HARQ-ACK is an ACK; the first HARQ-ACK sent by the third node on the one of the first set of channels is an ACK regardless of whether the first MAC PDU was decoded correctly by the third node.

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

sending a first physical layer signaling and a first MAC PDU through an air interface, wherein the first MAC PDU comprises a first MAC header and a first MAC SDU;

monitoring for a first HARQ-ACK on each channel in a first set of channels, the first HARQ-ACK indicating whether the first MAC PDU was decoded correctly;

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

13. A method in a third node for wireless communication, comprising:

transmitting a first HARQ-ACK on one channel in a first set of channels;