CN115884222A

CN115884222A - Method and equipment used for wireless communication

Info

Publication number: CN115884222A
Application number: CN202111318202.7A
Authority: CN
Inventors: 陈宇; 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2021-09-26
Filing date: 2021-11-09
Publication date: 2023-03-31

Abstract

A method and apparatus for wireless communication includes receiving a first message used to indicate switching from a direct path to an indirect path; starting a first timer; expiration of the first timer is used to trigger an RRC reestablishment; receiving a first signal on a sidelink after the act starts a first timer and before the first timer expires; stopping the first timer in response to receiving the first signal; sending a second message, the second message being used for feeding back the first message; wherein the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are respectively RRC messages; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer. The path switching can be performed by receiving the first message and the first signal.

Description

Method and equipment used for wireless communication

Technical Field

The present application relates to a transmission method and apparatus in a wireless communication system, and more particularly, to a method and apparatus for reducing service interruption, improving service continuity, enhancing reliability, and improving security in wireless communication.

Background

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

In Communication, both LTE (Long Term Evolution) and 5G NR relate to accurate reception of Reliable information, optimized energy efficiency ratio, determination of information validity, flexible resource allocation, scalable system structure, efficient non-access stratum information processing, lower service interruption and dropped rate, support for Low power consumption, which is important for normal Communication between a base station and user equipment, reasonable scheduling of resources, and balancing of system load, so to speak, high throughput rate, meet Communication requirements of various services, improve spectrum utilization, improve service quality, and are essential for eMBB (enhanced Mobile BroadBand), URLLC (Ultra Low Latency Communication), eMTC (enhanced Machine Type Communication) or eMTC (enhanced Machine Type Communication). Meanwhile, in the Internet of Things in the Industrial field, in V2X (Vehicular to X), communication between devices (Device to Device) is performed, in communication of unlicensed spectrum, user communication quality monitoring, network planning optimization is performed, in NTN (Non-terrestrial Network communication), in TN (terrestrial Network communication), in a Dual connectivity (Dual connectivity) system, in signaling design, neighborhood management, and service management are widely required in beamforming, and transmission modes of information are divided into broadcast and unicast, both of which are indispensable for a 5G system, because they help the UE to be connected to the Network, either directly or through relay connection.

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

The 3GPP standardization organization has made relevant standardization work for 5G, and forms a series of standards including 38.304,38.211,38.213, etc., and the contents of the standards can be referred to as follows:

https://www.3gpp.org/ftp/Specs/archive/38_series/38.304/38304-g40.zip

https://www.3gpp.org/ftp/Specs/archive/38_series/38.211/38211-g50.zip

https://www.3gpp.org/ftp/Specs/archive/38_series/38.213/38213-g50.zip

disclosure of Invention

In various communication scenarios, the use of relays may be involved, e.g. when one UE is not within the coverage area of a cell, the network may be accessed by a relay, and the relay node may be another UE. The relay mainly comprises a layer 3 relay and a layer 2 relay, and provides network access service for a remote node (remote UE) through a relay node, wherein the layer 3 relay is transparent to an access network, namely the remote UE only establishes connection with a core network, and the access network cannot identify whether data come from the remote node or the relay node; in layer 2 relay, the remote node and the access network have RRC connection, the access network can manage the remote node, and a radio bearer can be established between the access network and the remote node. In some cases, especially when the signal of the remote UE transmitted through the direct path is degraded and there are available relay nodes around the remote UE, the network may instruct the remote UE to switch the direct path transmission to the indirect path transmission, that is, to change from the direct connection network to the relay connection network, according to information such as a measurement report of the remote UE. However, a remote UE may not always succeed in switching from a direct path to an indirect path, in order to avoid unlimited waiting or trying of the remote UE, a timer may need to be set, how to control the timer, i.e. when to stop the timer, how the remote UE should process the timer after the timer expires is a problem to be solved, if the processing is not good, an excessive delay or interruption of communication is caused, and because the timer is used in the process of transmitting the direct path to the indirect path, the timer is neither the conventional timer used in directly communicating with the network nor the timer used in transmitting the sidelink, and therefore special processing needs to be performed according to the special scenario. In addition, how to determine that the indirect path transmission has been successfully established is also a problem to be solved.

The above-described problems, the present application provides a solution.

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

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

receiving a first message, the first message being used to indicate switching from a direct path to an indirect path; starting a first timer; expiration of the first timer is used to trigger an RRC reestablishment;

receiving a first signal on a sidelink after the act begins a first timer and before the first timer expires; stopping the first timer in response to receiving the first signal;

sending a second message, the second message being used for feeding back the first message;

wherein the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

As an embodiment, the problem to be solved by the present application includes: in scenarios involving relaying, especially when switching from direct path transmission or switching to indirect path transmission, a timer is used to control the switching process.

As an embodiment, the benefits of the above method include: the method provided by the application can avoid the problems of overlong waiting time, no response and the like which are possibly caused when the direct path transmission is switched to the indirect path transmission, and the switching is unsuccessful, and meanwhile, the timer is stopped when the indirect path transmission is determined to be used, and the processes such as RRC reconstruction and the like can be avoided.

In particular, according to one aspect of the present application, the first signal comprises a data packet generated by a sender of any of the first messages.

Specifically, according to an aspect of the present application, the first signal includes first signaling, and the first signaling is used for indicating that the indirect path is established.

In particular, according to an aspect of the present application, the first signal comprises second signaling used to confirm that the direct link between the first node and the sender of the first signal has been successfully established; the second signaling comprises a relay service code; the second signaling is a PC5-S message.

Specifically, according to an aspect of the present application, a first discovery message is received, where the first discovery message includes a first cell identity, and the first cell identity is a cell identity of a sender of the first message; the first discovery message comprises a first link layer identity of a sender of the first signal; evaluating a first measurement result according to a first reference signal resource; evaluating a second measurement result from a sidelink signal transmitted by a sender of the first discovery message;

sending a third message over the direct path, the third message being used to indicate the first link layer identity;

wherein the first message is to indicate switching from a direct path to an indirect path when a first condition is satisfied; the first condition comprises the first measurement being below a first threshold and the second measurement being above a second threshold; the first message comprises the first link layer identity; the first condition is satisfied; the configuration associated with the first condition in the first message is executed to trigger starting the first timer.

Specifically, according to an aspect of the present application, the RRC reestablishment includes: selecting a third node, the third node belonging to a first candidate relay list, the first candidate relay list relating to switching from a direct path to an indirect path; transmitting, by the third node, an RRC reestablishment request message using the indirect path; deleting the first candidate relay list in response to applying the first message;

wherein a first candidate cell list is retained during application of the first message, the first candidate cell list relating to conditional reconfiguration; the first candidate cell list includes at least one cell.

In particular, according to an aspect of the present application, during the running of said first timer, the conditional reconfiguration evaluation for CHO is maintained, and the evaluation for conditional switching from direct path to indirect path is stopped.

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

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

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

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

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

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

sending a first message, the first message being used to indicate switching from a direct path to an indirect path;

receiving a second message, the second message being used for feeding back the first message;

wherein a sender of the second message starts a first timer, expiration of the first timer being used to trigger an RRC reestablishment, a first signal is received on a sidelink after the act starts the first timer and before the first timer expires; the first signal is used to stop the first timer; the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

In particular, according to an aspect of the present application, a third message is received over the direct path, the third message being used to indicate the first link layer identity; the first reference signal resource is used to evaluate the first measurement result; the secondary link signal is used to evaluate the second measurement;

wherein the first message is to indicate switching from a direct path to an indirect path when a first condition is satisfied; the first condition comprises the first measurement being below a first threshold and the second measurement being above a second threshold; the first message comprises the first link layer identity; the configuration associated with the first condition in the first message is executed to trigger starting the first timer.

Specifically, according to an aspect of the present application, the RRC reestablishment includes: receiving, by the third node, an RRC reestablishment request message using the indirect path.

Specifically, according to an aspect of the present application, the second node is a base station.

In particular, according to an aspect of the present application, the second node is a relay.

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

In particular, according to an aspect of the present application, the second node is a satellite.

In particular, according to an aspect of the present application, the second node is an access point device.

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

forwarding a second message, the second message being used for feeding back the first message;

sending a first signal on a sidelink after the act starts a first timer and before the first timer expires;

wherein a sender of the second message starts a first timer, expiration of which is used to trigger an RRC reestablishment; the first signal is used to stop the first timer; the first message is used to indicate switching from the direct path to the indirect path; the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the first message is used for the action to start the first timer.

Specifically, according to one aspect of the present application, the first signal includes a data packet generated by a sender of any of the first messages.

In particular, according to an aspect of the present application, the first signal comprises second signaling, the second signaling being used to confirm that the direct link between the first node and the third node has been successfully established; the second signaling comprises a relay service code; the second signaling is a PC5-S message.

Specifically, according to an aspect of the present application, a first discovery message and a sidelink signal are transmitted, the first discovery message including a first cell identity, the first cell identity being a cell identity of a sender of the first message; the first discovery message comprises a first link layer identity of the third node; the first reference signal resource is used to evaluate the first measurement result; the secondary link signal is used to evaluate a second measurement;

Specifically, according to an aspect of the present application, the RRC reestablishment includes: selecting the third node, the third node belonging to a first candidate relay list, the first candidate relay list relating to switching from a direct path to an indirect path; transmitting, by the third node, an RRC reestablishment request message using the indirect path; deleting the first candidate relay list in response to applying the first message;

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

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

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

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

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

A first node used for wireless communication, comprising:

a first receiver to receive a first message used to instruct a switch from a direct path to an indirect path; starting a first timer; expiration of the first timer is used to trigger an RRC reestablishment;

the first receiver receiving a first signal on a sidelink after the act begins a first timer and before the first timer expires; stopping the first timer in response to receiving the first signal;

a first transmitter to transmit a second message, the second message being used for feeding back the first message;

wherein the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are respectively RRC messages; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

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

a second transmitter to transmit a first message, the first message being used to instruct switching from a direct path to an indirect path;

a second receiver receiving a second message, the second message being used for feeding back the first message;

wherein a sender of the second message starts a first timer, expiration of the first timer being used to trigger an RRC reestablishment, a first signal is received on a sidelink after the act starts the first timer and before the first timer expires; the first signal is used to stop the first timer; the first message is transmitted through the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

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

a third transmitter for forwarding a second message, the second message being used for feeding back the first message;

the third transmitter to send a first signal on a sidelink after the act begins a first timer and before the first timer expires;

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

the system error caused by failure when switching from the direct path to the indirect path can be avoided.

And the overlong time delay caused by failure in switching from the direct path to the indirect path is reduced.

An appropriate evaluation is made to evaluate the flag indicating successful establishment of the indirect path and stop the first timer accordingly.

Conditional based direct path to indirect path switching is supported.

Support mixed applications of CHO and condition-based direct path-to-indirect path switching.

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 illustrates a flow diagram of receiving a first message, starting a first timer, receiving a first signal, and sending a second message according to one embodiment of the application;

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

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

FIG. 4 shows a schematic diagram of a first communication device and a second communication device according to an embodiment of the present application;

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

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

figure 7 shows a schematic diagram of a protocol stack for relaying communications according to an embodiment of the present application;

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

FIG. 9 shows a schematic diagram of a first message being used for the behavior start of the first timer according to one embodiment of the application;

figure 10 illustrates a schematic diagram of a processing apparatus for use in a first node according to one embodiment of the present application;

figure 11 illustrates a schematic diagram of a processing device for use in a second node according to an embodiment of the present application;

fig. 12 illustrates a schematic diagram for a processing device in a third node according to an embodiment of the 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 flow chart of receiving a first message, starting a first timer, receiving a first signal, and sending a second message according to an embodiment of the application, as shown in fig. 1. In fig. 1, each block represents a step, and it is particularly emphasized that the sequence of the blocks in the figure does not represent a chronological relationship between the represented steps.

In embodiment 1, a first node in the present application receives a first message in step 101; starting a first timer in step 102; receiving a first signal in step 103; sending a second message in step 104;

wherein the first message is used to indicate switching from a direct path to an indirect path; expiration of the first timer is used to trigger an RRC reestablishment; the first node receiving the first signal on a sidelink after the act starts a first timer and before the first timer expires; the first node, in response to receiving the first signal, stopping the first timer; the second message is used for feeding back the first message; the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

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

As an embodiment, the direct path refers to a transmission path from the UE to the network, and the transmission through the direct path means that data is transmitted between the UE to the remote (remote) UE of the network (U2N) and the network without passing through a relay.

As a sub-embodiment of this embodiment, the data comprises higher layer data and signaling.

As a sub-embodiment of this embodiment, the data comprises a string or block of bits.

As a sub-embodiment of this embodiment, the data only includes signaling or data carried by an RB (radio bearer).

As an embodiment, the indirect path (indirect path) refers to a UE-to-Network transmission path through which transmission of data means forwarding between a UE to a remote UE of a Network (U2N, UE-to-Network) and the Network via the UE to a relay UE of the Network (U2N, UE-to-Network).

As a sub-embodiment of this embodiment, the data only includes signaling or data carried by RB (radio bearer).

As one embodiment, the U2N relay UE refers to a UE providing a function of supporting connection of a U2N remote UE to a network.

As an embodiment, a U2N remote UE refers to a UE that needs to go through a U2N relay UE to communicate with a network.

As an embodiment, a U2N remote UE refers to a UE that needs to go through a U2N relay UE to communicate with the network.

As an embodiment, the U2N remote UE refers to a UE supporting a relay service for communicating with a network.

As one embodiment, the U2N relay is a U2N relay UE.

As an embodiment, when performing unicast service transceiving with the network, both the U2N relay and the U2N remote node are in an RRC connected state.

As an embodiment, when the U2N remote UE is in the RRC idle state or the RRC inactive state, the U2N relay UE may be in any RRC state, including an RRC connected state, an RRC idle state, and an RRC inactive state.

As one embodiment, not transmitting over a direct path is equal to transmitting over an indirect path.

As one embodiment, transmitting without a direct path includes transmitting via a relay.

As one embodiment, transmitting via the direct path includes transmitting without relaying.

As one embodiment, transmitting via the direct path includes not forwarding via a relay.

As one embodiment, a U2N relay UE is a UE that provides functionality (functionality) supported by connection (connectivity) to a network for U2N remote UEs.

As a sub-embodiment of this embodiment, the U2N relay UE is a UE.

As a sub-embodiment of this embodiment, the U2N relay UE provides relay service to the network for the U2N remote UE.

As an embodiment, the U2N remote UE is a UE communicating with the network through a U2N relay UE.

As an embodiment, the serving cell refers to a cell where the UE camps. Performing cell search includes the UE searching for a suitable (able) cell of a selected PLMN (Public Land Mobile Network) or SNPN (Stand-alone Non-Public Network), selecting the suitable cell to provide available services, and monitoring a control channel of the suitable cell, which is defined as residing on the cell; that is, a camped cell is the serving cell for the UE with respect to the UE. The following benefits exist when the RRC idle state or the RRC inactive state resides in one cell: enabling the UE to receive system messages from the PLMN or SNPN; after registration, if the UE wishes to establish an RRC connection or continue a suspended RRC connection, the UE may do so by performing an initial access on a control channel of the camped cell; the network may page the UE; so that the UE can receive ETWS (Earthquake and Tsunami Warning System) and CMAS (Commercial Mobile Alert System) notifications.

As an embodiment, for a UE in an RRC connected state that is not configured with CA/DC (carrier aggregation/dual connectivity), only one serving cell includes a primary cell. For a UE in an RRC connected state configured with CA/DC (carrier aggregation/dual connectivity), a serving Cell is used to indicate a Cell set including a Special Cell (SpCell) and all slave cells. A Primary Cell (Primary Cell) is an MCG (Master Cell Group) Cell, and operates on a Primary frequency, and a UE performs an initial connection establishment procedure or initiates a connection reestablishment on the Primary Cell. For dual connectivity operation, a special Cell refers to a PCell (Primary Cell) of an MCG or a PSCell (Primary SCG Cell) of an SCG (Secondary Cell Group); the special cell is referred to as PCell if it is not a dual connectivity operation.

As an example, the frequency on which the SCell (slave Cell) operates is a slave frequency.

As an embodiment, the individual contents of an information element are referred to as a domain.

As an embodiment, MR-DC (Multi-Radio Dual Connectivity) refers to Dual Connectivity of E-UTRA and NR nodes, or Dual Connectivity between two NR nodes.

As an embodiment, in MR-DC, the radio access node providing the control plane connection to the core network is a master node, which may be a master eNB, a master ng-eNB, or a master gNB.

As an embodiment, MCG refers to a set of serving cells associated with a primary node in MR-DC, including spcells, and may, optionally, include one or more scells.

As an example, PCell is the SpCell of MCG.

As one example, the PSCell is the SpCell of SCG.

As an embodiment, in MR-DC, no control plane connection to the core network is provided, and the radio access node providing additional resources to the UE is a slave node. The slave node may be an en-gNB, a slave ng-eNB or a slave gNB.

As an embodiment, in MR-DC, the set of serving cells associated with a slave node is an SCG (secondary cell group) comprising an SpCell and, optionally, one or more scells.

As an embodiment, the access stratum function that enables V2X (Vehicle-to-eventing) communication defined in 3GPP standard TS 23.285 is V2X sidelink communication (V2X sidelink communication), where the V2X sidelink communication occurs between nearby UEs and uses E-UTRA techniques but does not traverse (transforming) network nodes.

As an embodiment, at least the access stratum function enabling V2X (Vehicle-to-event) communication defined in the 3GPP standard TS 23.287 is NR sidelink communication (NR sidelink communication) which takes place between two or more UEs in close proximity and uses NR techniques but does not traverse (transforming) network nodes.

As an example, the sidelink supports direct communication between UEs-to-UEs using sidelink resource allocation patterns, physical layer signals or channels, and physical layer procedures.

As one example, not or within or outside of coverage equals coverage.

As one embodiment, in-coverage is equal to in-coverage.

As one embodiment, out-of-coverage is equal to out-of-coverage.

For one embodiment, the first node is a U2N remote node.

As an embodiment, PDCP entities corresponding to radio bearers terminated between the UE and the network are located within the UE and the network, respectively.

As an embodiment, the direct path is a direct path or a communication link or a channel or a bearer used when transmitting over the direct path.

As an embodiment, the direct path transmission refers to that data carried by at least an SRB (Signaling radio bearer) between the UE and the network is not relayed or forwarded by other nodes.

As an embodiment, the direct path transmission means that RLC bearers associated with at least SRBs (Signaling radio bearers) between the UE and the network are respectively terminated at the UE and the network.

As an embodiment, the direct path transmission means that RLC entities associated with at least SRBs (Signaling radio bearers) between the UE and the network are respectively terminated at the UE and the network.

As an embodiment, the direct path transmission refers to that a direct communication link exists between the UE and the network.

As an embodiment, the direct path transmission means that a Uu interface exists between the UE and the network.

As an embodiment, the direct path transmission refers to that a MAC layer of a Uu interface exists between the UE and the network, and the MAC layer of the Uu interface carries RRC signaling.

As an embodiment, the direct path transmission refers to a physical layer where a Uu interface exists between the UE and the network.

As an embodiment, the direct path transmission means that a logical channel and/or a transport channel exists between the UE and the network.

As an embodiment, the indirect path is an indirect path or a communication link or a channel or a bearer used when transmitting through the indirect path.

As an embodiment, the indirect path transmission refers to relaying or forwarding data carried by at least SRB (Signaling radio bearer) between the UE and the network through other nodes.

As an embodiment, the indirect path transmission means that RLC bearers associated with at least SRBs (Signaling radio bearers) between the UE and the network are respectively terminated by the UE and other nodes, other nodes and the network.

As an embodiment, the indirect path transmission means that RLC entities associated with at least SRBs (Signaling radio bearers) between the UE and the network are respectively terminated by the UE and other nodes, other nodes and the network.

As an embodiment, the indirect path transmission refers to that no direct communication link exists between the UE and the network.

As an embodiment, the indirect path transmission refers to that there is no MAC layer of the Uu interface between the UE and the network.

As an embodiment, the indirect path transmission refers to that there is no physical layer of the Uu interface between the UE and the network.

As an embodiment, the indirect path transmission means that there is no logical channel and no transport channel between the UE and the network.

As an embodiment, the network comprises a Radio Access Network (RAN) and/or a serving cell and/or a base station.

As an embodiment, the meaning of the phrase at least SRB includes at least one of { SRB0, SRB1, SRB2, SRB3 }.

As an embodiment, the meaning of the phrase at least SRB includes SRB and DRB (data radio bearer).

As an embodiment, the phrase UE includes the first node with the UE in a network.

As an embodiment, the other nodes comprise relay nodes or other UEs.

As an embodiment, when using direct path transmission, the UE may send physical layer signaling to the network; when indirect path transmission is used, the UE cannot send or directly send physical layer signaling to the network;

as an embodiment, when using direct path transmission, the UE may send a MAC CE to the network; when the indirect path transmission is used, the UE cannot send the MAC CE to the network or directly send the MAC CE;

as an embodiment, when using direct path transmission, no other protocol layer exists between the PDCP layer and the RLC layer of the first node; when using indirect path transmission, there are other protocol layers between the PDCP layer and the RLC layer of the first node.

As a sub-embodiment of this embodiment, the further protocol layer is or comprises an adaptation layer.

As an embodiment, when using direct path transmission, the network directly schedules uplink transmission of the first node through DCI; when using the indirect path transmission, the network does not directly schedule the uplink transmission of the first node through the DCI.

As an embodiment, when using direct path transmission, the SRB of the first node is associated with an RLC entity and/or an RLC layer and/or an RLC bearer; when indirect path transmission is used, the SRB of the first node is associated with the RLC entity of the PC5 interface.

As an embodiment, when using direct path transmission, the SRB of the first node has a mapping relationship with an RLC entity of a Uu interface; when indirect path transmission is used, the SRB of the first node has a mapping relation with the RLC entity of the PC5 interface.

As an embodiment, only a direct path or only an indirect path exists between the first node and the network.

As an example, the phrase switching from a direct path to an indirect path means: the use of the indirect path is started while the use of the direct path is stopped.

As an example, the phrase switching from a direct path to an indirect path means: the use of indirect path transmission is started while the use of direct path transmission is stopped.

As an example, the phrase switching from a direct path to an indirect path means: the direct path transmission is changed into the indirect path transmission.

As an embodiment, the phrase switching from a direct path to an indirect path means: the first node associates the SRB with the RLC entity of the PC5 interface and simultaneously releases the RLC entity of the Uu interface associated with the SRB.

As an embodiment, the phrase switching from a direct path to an indirect path means: the first node associates SRBs and DRBs with RLC entities of the PC5 interface, and simultaneously releases RLC entities of the Uu interface associated with the SRBs and DRBs.

As an example, the phrase switching from a direct path to an indirect path means: the SRB and DRB of the first node are associated with the RLC entity of the PC5 interface and are no longer associated with the RLC entity of the Uu interface or the RLC bearer of the Uu interface.

As a sub-embodiment of this embodiment, the meaning that the phrase is no longer associated with the RLC entity of the Uu interface includes disassociation.

As a sub-embodiment of this embodiment, the meaning of the phrase no longer being associated with the RLC entity of the Uu interface includes that the radio bearer served by the RLC entity of the Uu interface includes neither SRBs nor DRBs.

As a sub-embodiment of this embodiment, the meaning of the phrase no longer being associated with the RLC entity of the Uu interface includes releasing the RLC bearer or RLC entity of the Uu interface.

As a sub-embodiment of this embodiment, an RLC bearer of at least one PC5 interface is added, and the added RLC bearer of the at least one PC5 interface serves the SRB and/or DRB of the first node.

As an example, the phrase switching from a direct path to an indirect path means: the SRB and the DRB of the first node are associated with a sidelink RLC entity and are no longer associated with an RLC entity of a Uu interface or an RLC bearer of the Uu interface.

As a sub-embodiment of this embodiment, at least one secondary link RLC bearer is added, and the at least one added secondary link RLC bearer serves the SRB and/or DRB of the first node.

As an embodiment, the phrase switching from a direct path to an indirect path means: at least one radio bearer of the first node is associated with a second RLC entity, the at least one radio bearer of the first node not being associated with a first RLC entity.

As a sub-embodiment of this embodiment, the second RLC entity is a secondary link RLC entity.

As a sub-embodiment of this embodiment, the second RLC entity is an RLC entity of the PC5 interface.

As a sub-embodiment of this embodiment, the first RLC entity is an RLC entity of the Uu interface.

As a sub-embodiment of this embodiment, the first RLC entity is an RLC entity.

As a sub-embodiment of this embodiment, the RLC entity is configured by RLC-BearerConfig.

As a sub-embodiment of this embodiment, the RLC entity is configured by RLC-config of RLC-BearerConfig.

As a sub-embodiment of this embodiment, the phrase not associated with a first RLC entity means that it is no longer associated with said first RLC entity.

As a sub-embodiment of this embodiment, the meaning of the phrase not being associated with a first RLC entity includes not being associated with the first RLC entity any more.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with the first RLC entity includes a disassociation.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with the first RLC entity includes demapping.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with the first RLC entity includes that the radio bearer served by the RLC bearer to which the first RLC entity corresponds does not include the at least one radio bearer of the first node.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with a first RLC entity comprises releasing said first RLC entity serving said at least one radio bearer of said first node.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with a first RLC entity includes releasing an RLC bearer corresponding to the first RLC entity serving the at least one radio bearer of the first node.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with the first RLC entity includes releasing all the RLC bearers and/or RLC entities of the Uu interface.

As a sub-embodiment of this embodiment, the phrase associated with the second RLC entity means: at least one secondary link RLC bearer is added, and the added at least one secondary link RLC bearer serves the at least one radio bearer of the first node.

As a sub-embodiment of this embodiment, the phrase associated with the second RLC entity means: configuring at least one secondary link RLC bearer to serve the at least one radio bearer of the first node.

As a sub-embodiment of this embodiment, the at least one radio bearer of the first node is an SRB.

As a sub-embodiment of this embodiment, the at least one radio bearer of the first node is a DRB.

As a sub-embodiment of this embodiment, the at least one radio bearer of the first node is any SRB other than SRB 0.

As a sub-embodiment of this embodiment, the at least one radio bearer of the first node is any RB.

As a sub-embodiment of this embodiment, the at least one radio bearer of the first node comprises any RB.

As a sub-embodiment of this embodiment, the at least one radio bearer of the first node is or comprises any SRB.

As a sub-embodiment of this embodiment, the at least one radio bearer of the first node is or comprises any DRB.

As an example, the phrase switching from a direct path to an indirect path means: at least one radio bearer of the first node is associated with a second RLC bearer, the at least one radio bearer of the first node is not associated with a first RLC bearer.

As a sub-embodiment of this embodiment, the second RLC bearer is a sidelink RLC bearer.

As a sub-embodiment of this embodiment, the second RLC bearer is an RLC bearer of the PC5 interface.

As a sub-embodiment of this embodiment, the first RLC bearer is an RLC bearer of a Uu interface.

As a sub-embodiment of this embodiment, the first RLC bearer is an RLC bearer.

As a sub-embodiment of this embodiment, the RLC bearer is configured by RLC-BearerConfig.

As a sub-embodiment of this embodiment, the RLC bearer is configured by RLC-config of RLC-BearerConfig.

As a sub-embodiment of this embodiment, the secondary link RLC bearer is configured by an RRC IE other than RLC-BearerConfig.

As a sub-embodiment of this embodiment, the secondary link RLC bearer is configured by an RRC IE other than the RLC-config of the RLC-BearerConfig.

As a sub-embodiment of this embodiment, the secondary link RLC bearer is configured by sl-RLC-BearerConfig.

As a sub-embodiment of this embodiment, the secondary link RLC bearer is configured by RLC-config of sl-RLC-BearerConfig.

As a sub-embodiment of this embodiment, the phrase not associated with the first RLC bearer means that it is no longer associated with said first RLC bearer.

As a sub-embodiment of this embodiment, the meaning of the phrase not being associated with the first RLC bearer includes not being associated with the first RLC bearer anymore.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with the first RLC bearer includes a disassociation relationship.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with the first RLC bearer includes demapping.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with a first RLC bearer includes that a radio bearer served by the first RLC bearer does not include the at least one radio bearer of the first node.

As a sub-embodiment of this embodiment, the meaning of the phrase not being associated with a first RLC bearer comprises releasing said first RLC bearer serving said at least one radio bearer of said first node.

As a sub-embodiment of this embodiment, the meaning of the phrase not associated with the first RLC bearer includes releasing said first RLC bearer.

As a sub-embodiment of this embodiment, the at least one radio bearer of the first node is served by the first RLC bearer before the first message is received.

As a sub-embodiment of this embodiment, the meaning of the phrase not being associated with the first RLC bearer includes releasing all RLC bearers and/or RLC entities of the Uu interface.

As a sub-embodiment of this embodiment, the phrase associated with the second RLC bearer means: at least one secondary link RLC bearer is added, and the added at least one secondary link RLC bearer serves the at least one radio bearer of the first node.

As a sub-embodiment of this embodiment, the phrase associated with the second RLC bearer means: configuring at least one secondary link RLC bearer to serve the at least one radio bearer of the first node.

As a sub-embodiment of this embodiment, the RLC-BearerToReleaseList of the first message comprises an identity of the first RLC bearer.

As a sub-embodiment of this embodiment, the phrase not associated with the first RLC bearer means that the RLC-BearerToReleaseList of said first message comprises the identity of said first RLC bearer.

As a sub-embodiment of this embodiment, the phrase associated with the second RLC bearer means: the sl-RLC-bearerToReleaseList included in the first message configures the at least one radio bearer for the second RLC bearer to serve the first node.

As a sub-embodiment of this embodiment, the phrase associated with the second RLC bearer means: the PC5 related RLC-BeareToAddModList included in the first message configures the at least one radio bearer of the first node to be served by the second RLC bearer.

As a sub-embodiment of this embodiment, the phrase associated with the second RLC bearer means: the relay related RLC-BearerToAddModList comprised by the first message configures the at least one radio bearer of the second RLC bearer serving the first node.

As a sub-embodiment of this embodiment, the phrase associated with the second RLC bearer means: the RLC-BearerToAddModList related to the secondary link included in the first message configures the at least one radio bearer of the second RLC bearer serving the first node.

As one embodiment, the first message includes an rlc-BearerToReleaseList.

As one embodiment, the first message comprises sl-RLC-BearerToAddModList.

As an embodiment, the first message comprises RLC-BearerToAddModList related to PC 5.

As a sub-embodiment of this embodiment, the phrase that said first message comprises RLC-BearerToAddModList relating to PC5 means that: the first message comprises an Information Element (IE) including in its name both PC5 and BearerToAddModList.

As an embodiment, the first message includes RLC-BearerToAddModList related to relay.

As a sub-embodiment of this embodiment, the phrase that said first message comprises RLC-BearerToAddModList relating to relay means: the first message comprises an Information Element (IE) including both a relay and a BearerToAddModList in one name.

As a sub-embodiment of this embodiment, the phrase that said first message comprises RLC-BearerToAddModList relating to relay means: said first message comprises an Information Element (IE) whose name comprises BearerToAddModList, and said information element whose name comprises BearerToAddModList indicates relay related.

As one embodiment, the first message includes RLC-BearerToAddModList related to the sidelink.

As an embodiment, the first message is or comprises RRCReconfiguration.

As an embodiment, the first message is or comprises RRCConnectionReconfiguration.

For one embodiment, the first message comprises CellGroupConfig.

For one embodiment, the first message includes RLC-config.

For one embodiment, the first message comprises sl-RLC-config.

For one embodiment, the first message includes relay-RLC-config.

For one embodiment, the first message includes an RLC-config-relay.

For one embodiment, the first message indicates that an RLC bearer associated with the direct path is released.

For one embodiment, the first message indicates that at least one logical channel is released.

As an embodiment, the first message indicates the release of the at least one logical channel identity by means of an rlc-BearerToReleaseList.

As an embodiment, the first message indicates at least one addition of an RLC bearer related to an indirect path.

As an embodiment, the first message indicates to add at least one of a sidelink RLC bearer related to the indirect path or an RLC bearer of the PC5 interface.

As an embodiment, the first message indicates at least that the RLC bearer associated with the one SRB is modified to be a secondary link RLC bearer or an RLC bearer of the PC5 interface.

As an embodiment, the first message indicates at least that one SRB is no longer associated with an RLC bearer, but is instead associated with a sidelink (sidelink) RLC bearer or an RLC bearer of the PC5 interface.

As an embodiment, the first message indicates at least that one SRB is no longer associated with an RLC bearer, but an indirect path related RLC bearer or a relay RLC bearer.

As one embodiment, the first message indicates: all SRBs are no longer associated with RLC bearers but rather with either indirect path related RLC bearers or relay RLC bearers.

As a sub-embodiment of this embodiment, the RLC bearer refers to an RLC bearer of a Uu interface.

As one embodiment, the first message indicates: all DRBs are no longer associated with RLC bearers but rather with indirect path related RLC bearers or relay RLC bearers.

As an embodiment, the first message indicates: all SRBs are no longer associated with RLC bearers, but rather with non-direct path related RLC bearers or relay RLC bearers.

As one embodiment, the first message includes a reconfigurationWithSync.

For one embodiment, the first timer is not T304.

As one embodiment, the first timer is not T310.

As one embodiment, the first timer is not T311.

As one embodiment, the first timer is not T312.

As an embodiment, the first timer is not T316.

As one embodiment, the first timer is T303.

For one embodiment, the first timer is T305.

For one embodiment, the first timer is T314.

For one embodiment, the first timer is T324.

For one embodiment, the first timer is T334.

For one embodiment, the first timer is T344.

As one embodiment, the first timer is T304a.

As one embodiment, the first timer is T304b.

For one embodiment, the first timer is T304r.

As one embodiment, the first timer is T304-r.

As one embodiment, the first timer is T401.

For one embodiment, the first timer is T402.

As one embodiment, the first timer is T403.

For one embodiment, the first timer is T404.

For one embodiment, the first timer is T414.

As an example, the first timer is T411.

For one embodiment, the first timer is T410.

As one embodiment, the first timer is T500.

As one embodiment, the first timer is T501.

For one embodiment, the first timer is T502.

As one embodiment, the first timer is T503.

For one embodiment, the first timer is T504.

As one embodiment, the first timer is T514.

As an embodiment, the name of the first timer comprises a relay.

As an embodiment, the name of the first timer includes r.

As an example, the name of the first timer includes T1.

As an example, the name of the first timer includes T2.

For one embodiment, the name of the first timer includes 304.

For one embodiment, the first timer is not T304.

For one embodiment, expiration of the first timer triggers the first node to perform an RRC reestablishment (RRC Re-initialization).

As one example, the expiration of the first timer is considered a failure.

As an embodiment, expiration of the first timer triggers the first node to initiate reestablishment of the RRC connection.

As an embodiment, the first node is in an RRC connected state.

As one embodiment, the act of starting the first timer includes restarting the first timer.

As one embodiment, the time after the action starts a first timer and before the first timer expires refers to the time of the first timer that is in a running state.

For one embodiment, the reception of the first signal triggers the first node to stop the first timer.

As one embodiment, the secondary link is a communication link between the first node and other UEs.

As one embodiment, the secondary link is a communication link between the first node and a relay.

As an embodiment, the Physical Channel occupied by the first signal is a psch (Physical Sidelink Shared Channel).

As an embodiment, the Physical Channel occupied by the first signal is a PSCCH (Physical Sidelink Control Channel).

As an embodiment, the Physical Channel occupied by the first signal is a PSFCH (Physical Sidelink Feedback Channel).

As an embodiment, the first signal is received after the second message is sent.

As an embodiment, the first signal is received later than the second message is transmitted.

As an embodiment, the second message triggers the first signal.

For one embodiment, the first signal is an ACK.

For one embodiment, the first signal comprises an ACK.

As an example, the first signal includes SCI (sidelink control information).

As one embodiment, the first signal is SCI.

For one embodiment, the first signal includes a MAC CE.

As one embodiment, the first signal is a MAC CE.

For one embodiment, the first signal includes a MAC CE and a SCI.

As an embodiment, the first signal is MAC CE and SCI.

For one embodiment, the first signal comprises a PC5-RRC message.

As an embodiment, the first signal is a PC5-RRC message.

As an embodiment, the bearer occupied by the first signal is a sidelink bearer.

For one embodiment, the second message occupies sidelink resources; the first message does not occupy secondary link resources.

As one embodiment, the second message includes RRC signaling.

As an embodiment, the second message is rrcreconconfigurationcomplete.

As an embodiment, the second message is rrcconnectionreconfiguration complete.

As one embodiment, the second message occurs in pairs with the first message.

As an embodiment, the second message indicates that at least part of the configuration in the first message has been applied.

As an embodiment, the transmission of the first message over the direct path means that the physical channel occupied by the first message includes or only includes the PDSCH; the transmission of the second message over the indirect path means that the physical channel occupied by the second message comprises at least one of { PSSCH, PSCCH, PSFCH }, or only.

As an example, the transmission of the first message over the direct path means that the physical channel occupied by the first message does not include any of { psch, PSCCH, PSFCH }.

As an example, the meaning that the behavior is received over the sidelink includes: received on a resource of the sidelink.

As an example, the meaning that the behavior is received over the sidelink includes: received on a channel of the sidelink.

As a sub-embodiment of this embodiment, the channel of the secondary link includes at least one of { psch, PSCCH, PSFCH }.

As an embodiment, the sender of the first signal is a relay of the first node.

As an embodiment, the sender of the first signal is a U2N relay of the first node.

As an embodiment, the sender of the first signal is a relay comprised by the indirect path.

As an embodiment, the sender of the first signal is a relay between the first node and a network.

As an embodiment, the meaning of the second message being transmitted over the indirect path includes the second message being forwarded by the sender of the first signal.

As an embodiment, the first signal comprises a data packet generated by a sender of any of the first messages; alternatively, said first signal comprises a data packet generated by a sender of a first of said first messages.

As a sub-embodiment of this embodiment, the sender of the first message is the serving cell of the first node.

As a sub-embodiment of this embodiment, the sender of the first message is a base station.

As a sub-embodiment of this embodiment, the sender of the first message does not include a relay.

As a sub-embodiment of this embodiment, the sender of the first message is the generator of the first message.

As a sub-embodiment of this embodiment, the sender of the first message does not include other UEs.

As a sub-embodiment of this embodiment, the data packet generated by the sender of any of the first messages is or includes a PDCP PDU.

As a sub-embodiment of this embodiment, the data packet generated by the sender of any of the first messages is or includes a PDCP SDU.

As a sub-embodiment of this embodiment, the data packet generated by the sender of any of the first messages is or includes an IP packet.

As a sub-embodiment of this embodiment, the data packet generated by the sender of any of the first messages is or includes an RRC message.

As a sub-embodiment of this embodiment, the data packet generated by the sender of any of the first messages is or includes a NAS message.

As a sub-embodiment of this embodiment, the data packet generated by the sender of any of the first messages uses the SRB and/or DRB of the first node.

As a sub-embodiment of this embodiment, the data packet generated by the sender of any of the first messages is or includes a system message.

As an embodiment, the first signal comprises first signaling, the first signaling being used to indicate that the indirect path is established.

As a sub-embodiment of this embodiment, the first signaling indicates that the sender of the first signal has established an RRC connection, and the established RRC connection is used to confirm that the indirect path is established.

As a sub-embodiment of this embodiment, the first signaling is a PC5-S message.

As a sub-embodiment of this embodiment, the first signaling is a PC5-RRC message.

As a sub-embodiment of this embodiment, the first signaling is a discovery message.

As a sub-embodiment of this embodiment, the first signaling indicates that the data of the first node has been successfully forwarded to the network.

As a sub-embodiment of this embodiment, the first signaling is a PDCP status report.

As a sub-embodiment of this embodiment, the first signaling is adaptation layer signaling.

As a sub-embodiment of this embodiment, the first signaling is a MAC CE.

As a sub-embodiment of this embodiment, the first signaling is transmitted over the PSCCH.

As a sub-embodiment of this embodiment, the first signaling indicates that the first node may communicate with the network over the indirect path.

As a sub-embodiment of this embodiment, the first signaling explicitly indicates that the indirect path is established.

As a sub-embodiment of this embodiment, the first signaling indicates that an acknowledgement has been received by the network that the indirect path has been established.

As a sub-embodiment of this embodiment, the first signaling indicates that an acknowledgement sent by an RLC entity located on the network side corresponding to an RLC bearer for forwarding the data of the first node is received.

As a sub-embodiment of this embodiment, the first signaling indicates that an RLC status report sent by an RLC entity located on the network side and corresponding to an RLC bearer for forwarding data of the first node is received.

As a sub-embodiment of this embodiment, the first signaling indicates that a receiving or sending window of an RLC entity located at the Uu interface of the sender of the first signal corresponding to an RLC bearer that receives data for forwarding the first node moves.

As a sub-embodiment of this embodiment, the first signaling indicates that an RLC bearer of the Uu interface that receives data for forwarding the first node is established.

As a sub-embodiment of this embodiment, the first signaling is RRCReconfigurationSidelink.

As a sub-embodiment of this embodiment, the first signaling is rrcreeconfiguration completesidelink.

As a sub-embodiment of this embodiment, the first signaling is SCCH-Message.

As a sub-embodiment of this embodiment, the generator of the first signaling is the sender of the first signal.

As a sub-embodiment of this embodiment, the generator of the first signaling is a relay of the first node.

As a sub-embodiment of this embodiment, the reception of the first signaling may confirm that the first node is able to communicate with the network using the indirect path.

As an embodiment, the first signal comprises second signaling used to confirm that a direct link between the first node and a sender of the first signal has been successfully established; the second signaling comprises a relay service code; the second signaling is a PC5-S message.

As a sub-embodiment of this embodiment, the second signaling indicates that the PC5 unicast link establishment is complete.

As a sub-embodiment of this embodiment, the second signaling indicates that the PC5 unicast link modification is complete.

As a sub-embodiment of this embodiment, the second signaling indicates agreement to establish the direct link.

As a sub-embodiment of this embodiment, the second signaling indicates that the direct link has been established.

As a sub-embodiment of this embodiment, the second signaling indicates that the direct link authentication is complete.

As a sub-embodiment of this embodiment, the second signaling is Direct link addressing.

As a sub-embodiment of this embodiment, the second signaling is Direct linking modification accept.

As a sub-embodiment of this embodiment, the second signaling is Direct link authentication response.

As a sub-embodiment of this embodiment, the relay service code is RSC (relay service code).

As a sub-embodiment of this embodiment, the relay service code is used for 5G ProSe u2n (UE-to-Network) relay discovery for indicating connection services provided by the 5G ProSe u2n relay; the 5G ProSe u2n relay and the 5G ProSe u2n remote UEs may determine from RSC whether to support layer 2 or layer 3 relay.

For one embodiment, the first node transmits a second signal on a sidelink; the second signal comprises third signaling, the second signaling being used to confirm that a direct link between the first node and a sender of the first signal has been successfully established; the second signaling comprises a relay service code; the third signaling is a PC5-S message; in response to sending the second signal, the first node stops the first timer.

As a sub-embodiment of this embodiment, the third signal occupies the pscch channel.

As a sub-embodiment of this embodiment, the third signaling indicates that the PC5 unicast link establishment is complete.

As a sub-embodiment of this embodiment, the third signaling indicates that the PC5 unicast link modification is complete.

As a sub-embodiment of this embodiment, the third signaling indicates agreement to establish the direct link.

As a sub-embodiment of this embodiment, the third signaling indicates that the direct link establishment is complete.

As a sub-embodiment of this embodiment, the third signaling indicates that the direct link authentication is complete.

As a sub-embodiment of this embodiment, the third signaling is Direct link addressing.

As a sub-embodiment of this embodiment, the third signaling is Direct linking modification accept.

As a sub-embodiment of this embodiment, the third signaling is Direct link authentication response.

Example 2

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

The V2X communication architecture of embodiment 2 includes UE (User Equipment) 201, ue241, ng-RAN (next generation radio access network) 202,5gc (5G Core network )/EPC (Evolved Packet Core) 210, hss (Home Subscriber Server )/UDM (Unified Data Management) 220, proSe function 250, and ProSe application Server 230. The V2X communication architecture may interconnect with other access networks, but these entities/interfaces are not shown for simplicity. As shown, the V2X communication architecture provides packet switched services, however those skilled in the art will readily appreciate that the various concepts presented throughout this application may be extended to networks providing circuit switched services or other cellular networks. The NG-RAN includes NR node bs (gnbs) 203 and other gnbs 204. The gNB203 provides user and control plane protocol termination towards the UE201. 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/EPC210. 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 via an S1/NG interface. The 5GC/EPC210 includes MME (Mobility Management Entity)/AMF (Authentication Management Field)/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/EPC210. 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/UPF213. 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 Service (ProSe); including a DPF (Direct Provisioning Function), a Direct Discovery Name Management Function (Direct Discovery Name Management Function), an EPC-level Discovery ProSe Function (EPC-level Discovery ProSe Function), and the like. The ProSe application server 230 has the functions of storing EPC ProSe subscriber identities, mapping between application layer subscriber identities and EPC ProSe subscriber identities, allocating ProSe restricted code suffix pools, etc.

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

As an embodiment, the ProSe function 250 is connected 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 in the present application is a UE201.

As an example, the second node in this application is the gNB203.

As an embodiment, the third node in this application is UE241.

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 radio link from the UE241 to the NR node B is an uplink.

As an embodiment, the radio link from the NR node B to the UE241 is the downlink.

As an embodiment, the UE201 supports relay transmission.

As an embodiment, the UE241 supports relay transmission.

As an embodiment, the UE201 is a vehicle including an automobile.

As an embodiment, the UE241 is a vehicle including an automobile.

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 shows a schematic diagram of an embodiment of a radio protocol architecture for the user plane and the control plane according to the present application, as shown in fig. 3. Fig. 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, fig. 3 showing the radio protocol architecture for the control plane 300 between a first node (UE, satellite or aircraft in a gNB or NTN) and a second node (gNB, satellite or aircraft in a UE or NTN), or two UEs, in three layers: layer 1, layer 2 and layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to herein as PHY301. Layer 2 (L2 layer) 305 is above PHY301 and is responsible for the link between the first and second nodes and the two UEs through PHY301. The L2 layer 305 includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the second node. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security by ciphering data packets and provides handoff support for a first node between second nodes. The RLC sublayer 303 provides segmentation and reassembly of upper layer packets, retransmission of lost packets, and reordering of packets to compensate for out-of-order reception due to HARQ. The MAC sublayer 302 provides multiplexing between logical and transport channels. The MAC sublayer 302 is also responsible for allocating the various radio resources (e.g., resource blocks) in one cell between the first nodes. The MAC sublayer 302 is also responsible for HARQ operations. A RRC (Radio Resource Control) sublayer 306 in layer 3 (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 between the second node and the first node. The PC5-S (PC 5Signaling Protocol) sublayer 307 is responsible for processing of the Signaling Protocol of the PC5 interface. The radio protocol architecture of the user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer), the radio protocol architecture for the first node and the second node in the user plane 350 is substantially the same for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355 and the MAC sublayer 352 in the L2 layer 355 as the corresponding layers and sublayers in the control plane 300, but the PDCP sublayer 354 also provides header compression for upper layer packets to reduce radio transmission overhead. The L2 layer 355 in the user plane 350 further includes an SDAP (Service Data Adaptation Protocol) sublayer 356, and the SDAP sublayer 356 is responsible for mapping between QoS streams and Data Radio Bearers (DRBs) to support diversity of services. Although not shown, the first node may have several upper layers above the L2 layer 355. Also included are a network layer (e.g., IP layer) that terminates at the P-GW on the network side and an application layer that terminates at the other end of the connection (e.g., far end UE, server, etc.). For a UE related to relay service, its control plane may further include an adaptation sublayer AP308, and its user plane may also include an adaptation sublayer AP358, and the introduction of the adaptation layer may facilitate the lower layers, such as the MAC layer, e.g., the RLC layer, to multiplex and/or differentiate data from multiple source UEs, and may also not include the adaptation sublayer for communication between the UE related to relay service and the UE. In addition, the adaptation sublayers AP308 and AP358 may also serve as sublayers within the PDCP304 and PDCP354, respectively. The RRC306 may be used to handle RRC signaling for the Uu interface and signaling for the PC5 interface.

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

The radio protocol architecture of fig. 3 applies to the second node in this application as an example.

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

As an embodiment, the first message in this application is generated in RRC306.

As an embodiment, the second message in this application is generated in RRC306.

As an embodiment, the third message in this application is generated in RRC306.

As an embodiment, the first signal in the present application is generated in PHY301 or MAC302 or RLC303 or RRC306 or PC5-S307.

As an embodiment, the second signal in this application is generated in PHY301 or MAC302 or RLC303 or RRC306 or PC5-S307.

As an embodiment, the first signaling in the present application is generated in PHY301, MAC302, RLC303, RRC306, or PC5-S307.

As an embodiment, the second signaling in this application is generated in the PC5-S307.

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

As an embodiment, the first discovery message in this application is generated in PHY301, MAC302, RLC303, RRC306, or PC5-S307.

Example 4

Embodiment 4 shows a schematic diagram of a first communication device and a second communication device 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 multiple antenna transmit processor 457, a multiple 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 the L2 layer. 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 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 streams from 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 functions of the L2 layer. The controller/processor 459 may be associated with a memory 460 that stores program codes and data. Memory 460 may be referred to as a computer-readable medium. In transmissions from the second communications device 410 to the second communications device 450, the controller/processor 459 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer packets from the core network. The upper layer packet is then provided to all protocol layers above the L2 layer. Various control signals may also be provided to L3 for L3 processing.

In a transmission from the first communications device 450 to the second communications device 410, a data source 467 is used at the first communications device 450 to provide upper layer data packets to a controller/processor 459. The 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 functions of the L1 layer. The controller/processor 475 implements 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 communication device 450 to the second communication 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, with the at least one processor, the first communication device 450 apparatus at least: receiving a first message, the first message being used to indicate switching from a direct path to an indirect path; starting a first timer; expiration of the first timer is used to trigger an RRC reestablishment; receiving a first signal on a sidelink after the act starts a first timer and before the first timer expires; stopping the first timer in response to receiving the first signal; sending a second message, the second message being used for feeding back the first message; wherein the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

As an embodiment, the first communication device 450 includes: a memory storing a program of computer readable instructions that when executed by at least one processor result in actions comprising: receiving a first message, the first message being used to indicate switching from a direct path to an indirect path; starting a first timer; expiration of the first timer is used to trigger an RRC reestablishment; receiving a first signal on a sidelink after the act begins a first timer and before the first timer expires; stopping the first timer in response to receiving the first signal; sending a second message, the second message being used for feeding back the first message; wherein the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

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: sending a first message, the first message being used to indicate switching from a direct path to an indirect path; receiving a second message, the second message being used for feeding back the first message; wherein a sender of the second message starts a first timer, expiration of the first timer being used to trigger an RRC reestablishment, a first signal is received on a sidelink after the act starts the first timer and before the first timer expires; the first signal is used to stop the first timer; the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

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: sending a first message, the first message being used to indicate switching from a direct path to an indirect path; receiving a second message, the second message being used for feeding back the first message; wherein a sender of the second message starts a first timer, expiration of the first timer being used to trigger an RRC reestablishment, a first signal is received on a sidelink after the act starts the first timer and before the first timer expires; the first signal is used to stop the first timer; the first message is transmitted through the direct path; the second message is transmitted through the indirect path; the first message and the second message are RRC messages, respectively; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

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: forwarding a second message, the second message being used for feeding back the first message; sending a first signal on a sidelink after the act starts a first timer and before the first timer expires; wherein a sender of the second message starts a first timer, expiration of which is used to trigger an RRC reestablishment; the first signal is used to stop the first timer; the first message is used to indicate switching from the direct path to the indirect path; the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are respectively RRC messages; the first message is used for the action to start the first timer.

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: forwarding a second message, the second message being used for feeding back the first message; sending a first signal on a sidelink after the act starts a first timer and before the first timer expires; wherein a sender of the second message starts a first timer, expiration of which is used to trigger an RRC reestablishment; the first signal is used to stop the first timer; the first message is used to indicate switching from the direct path to the indirect path; the first message is transmitted over the direct path; the second message is transmitted through the indirect path; the first message and the second message are respectively RRC messages; the first message is used for the action to start the first timer.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

For one embodiment, receiver 416 (including antenna 420), receive processor 412, and controller/processor 440 are used to receive the second message in this application.

For one embodiment, receiver 416 (including antenna 420), receive processor 412, and controller/processor 440 are used to receive the third message in this application.

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

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

For one embodiment, a transmitter 456 (including an antenna 460), a transmit processor 455, and a controller/processor 490 are used to transmit the first signal in this application.

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

For one embodiment, a transmitter 456 (including an antenna 460), a transmit processor 455, and a controller/processor 490 are used to send the first discovery message in this application.

Example 5

Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in fig. 5. In fig. 5, U01 corresponds to a first node of the present application, U02 corresponds to a second node of the present application, and U03 third node corresponds to a third node of the present application, and it is specifically illustrated that the sequence in the present example does not limit the signal transmission sequence and the implemented sequence in the present application, and the steps in F51 are optional.

ForFirst node U01Receiving a first discovery message in step S5101; receiving a first message in step S5102; receiving a first signal in step S5103; the second message is sent in step S5104.

For theSecond node U02In step S5201, the first message is transmitted; the second message is received in step S5202.

For theThird node U03Transmitting a first discovery message in step S5301; transmitting the first signal in step S5302; the second message is forwarded in step S5303.

In embodiment 5, the first message is used to indicate switching from a direct path to an indirect path; the first node U01 starts a first timer; expiration of the first timer is used to trigger an RRC reestablishment; said first node U01, after said act starts a first timer and before said first timer expires, receiving a first signal on a sidelink, and in response to receiving said first signal, stopping said first timer; the second message is used for feeding back the first message; the first message is transmitted through the direct path; the second message is transmitted through the indirect path; the first message and the second message are respectively RRC messages; the second message is relayed by a sender of the first signal; the first message is used for the action to start the first timer.

As an embodiment, the first node U01 is a U2N relay UE.

As an embodiment, the first node U01 is a U2N remote UE.

As an embodiment, the first node U01 is a NR ProSe U2N remote UE.

As an embodiment, the third node U03 is a UE.

As an embodiment, the third node U03 is a U2N relay of the first node U01.

As an embodiment, the third node U03 is a layer 2 relay of the first node U01.

As an embodiment, the third node U03 is an NR ProSe U2N relay.

As an embodiment, the second node U02 is a serving cell of the first node U01.

As an embodiment, the second node U02 is a primary cell of the first node U01.

As an embodiment, the second node U02 is the master cell group of the first node U01.

As an embodiment, the second node U02 is a base station corresponding to or belonging to a primary cell of the first node U01.

As an embodiment, the second node U02 is a base station corresponding to or belonging to a primary cell of the second node U02.

As an embodiment, the second node U02 is not the serving cell of the first node U01.

As an embodiment, the second node U02 is a serving cell of the third node U03.

As an embodiment, the second node U02 is a primary cell of the third node U03.

As an embodiment, the second node U02 is the master cell group of the third node U03.

As an embodiment, the second node U02 is a base station corresponding to or belonging to a primary cell of the third node U03.

As an embodiment, the first node U01 and the third node U03 have the same primary cell (PCell).

As an embodiment, the camping cell of the first node U01 is or belongs to the second node U02.

As an embodiment, the cell where the third node U03 resides is or belongs to the second node U02.

As an embodiment, the home cell of the first node U01 is or belongs to the second node U02.

As an embodiment, the home cell of the third node U03 is or belongs to the second node U02.

As an embodiment, an RRC connection exists between the first node U01 and the third node U03.

As an embodiment, an RRC connection exists between the third node U03 and the second node U02.

As an embodiment, an RRC connection exists between the first node U01 and the second node U02.

As an embodiment, there is no RRC connection between the third node U03 and the second node U02.

As an embodiment, the third node U03 applies the system message of the second node U02.

As an embodiment, the first node U01 applies the system message forwarded by the third node U03.

As an embodiment, the first node U01 communicates with the second node U02 via a direct path at least before receiving the first message.

For one embodiment, the first node U01 and the third node U03 communicate via a sidelink.

For one embodiment, the first node U01 establishes a direct link with the third node U03.

For one embodiment, the first discovery message comprises a discover message.

As an embodiment, the first discovery message is a NAS layer message.

As an embodiment, the first discovery message occupies sidelink resources.

As one embodiment, the first discovery message is sent on a sidelink.

As an embodiment, the name of the first discovery message comprises discovery.

As an embodiment, the first cell identity is NCI.

As an embodiment, the first cell identity is an ID of the second node U02.

As an embodiment, the first cell identity is an ID of a cell of the second node U02.

As an embodiment, the sender of the first message is the second node U02.

As an embodiment, the sender of the first signal is the third node U03.

For one embodiment, the first link layer identity is a link layer identity.

As an embodiment, the first link layer identity is a layer-2ID.

For one embodiment, the first discovery message includes the first link layer identity.

As an embodiment, the header of the MAC sub-PDU carrying the first discovery message comprises 8 most significant bits of the first link layer identity, the first link layer identity comprises 24 bits, and the header of the MAC sub-PDU carrying the first discovery message does not comprise bits other than the 8 most significant bits of the first link layer identity.

As an embodiment, the header of the MAC sub-PDU carrying the first discovery message comprises the 16 most significant bits of the first link layer identity, the first link layer identity comprises 24 bits, and the header of the MAC sub-PDU carrying the first discovery message does not comprise bits other than the 16 most significant bits of the first link layer identity.

As an embodiment, the header of the MAC sub-PDU carrying the second message includes 8 most significant bits of the first link layer identity, the first link layer identity includes 24 bits, and the header of the MAC sub-PDU carrying the second message does not include bits other than the 8 most significant bits of the first link layer identity.

As a sub-embodiment of this embodiment, the MAC sub-PDU carrying the second message is transmitted over a sidelink.

For one embodiment, the first reference signal resource includes an SSB.

For one embodiment, the first reference signal resource includes a CSI-RS.

For one embodiment, the first reference signal resource includes a SSB-index.

For one embodiment, the first reference signal resource includes a CSI-RS-index.

As an embodiment, the first reference signal resource is indicated by the second node U02.

As one embodiment, the first reference signal resource is indicated by the first message.

As an embodiment, the first reference signal resource is a reference signal resource of the second node U02.

As an embodiment, the sentence evaluating the meaning of the first measurement result from the first reference signal resource comprises measuring the first reference signal resource, the measurement result on the first reference signal resource being the first measurement result.

As an embodiment, the sentence evaluating the meaning of the first measurement result from the first reference signal resource comprises performing a measurement on the first reference signal resource, the measurement on the first reference signal resource being the first measurement result.

As an embodiment, the first measurement result is RSRP (Reference Signal Receiving Power).

As an embodiment, the first measurement result is RSRQ (Reference Signal Receiving Quality).

As an embodiment, the first measurement result is RSSI (Received Signal Strength Indication).

As an embodiment, the first measurement is SNR (SIGNAL-to-NOISE RATIO).

As an embodiment, the sender of the first discovery message is the sender of the first signal.

As one embodiment, the secondary link signal transmitted by the sender of the first discovery message is or includes a discovery message.

As one embodiment, the sidelink signal transmitted by the sender of the first discovery message is or includes a reference signal.

As an embodiment, the method further comprises receiving a second measurement result from the second message, wherein the second measurement result is derived from a sidelink signal transmitted by the sender of the first discovery message.

As an embodiment, the sentence evaluating the meaning of the second measurement result according to the sidelink signal sent by the sender of the first discovery message comprises measuring the first discovery message or the physical resource occupied by the first discovery message or the reference signal included in the physical resource block occupied by the first discovery message to obtain the second measurement result.

As an embodiment, the sentence evaluating the meaning of the second measurement result from the sidelink signal sent by the sender of the first discovery message comprises measuring a discovery message sent by the sender of the first discovery message to obtain the second measurement result.

As one embodiment, the sentence evaluating the meaning of the second measurement result from a sidelink signal transmitted by the sender of the first discovery message comprises measuring a reference signal transmitted by the sender of the first discovery message on a sidelink to obtain the second measurement result.

As an embodiment, the sentence evaluating meaning of a second measurement result from a sidelink signal transmitted by a transmitter of the first discovery message comprises measuring a signal transmitted by the transmitter of the first discovery message on at least one of { PBSCH, PSSCH, PSCCH } to obtain the second measurement result.

As an embodiment, the second measurement result is SL-RSRP (Sidelink Reference Signal Receiving Power).

As one embodiment, the second measurement result is SD-RSRP.

As an embodiment, the second measurement result is RSRP measured according to a discovery message.

As an embodiment, the second measurement result is PSBCH RSRP (PSBCH reference signal received power).

As one embodiment, the second measurement result is PSSCH-RSRP (PSSCH reference signal received power).

As an embodiment, the second measurement result is PSCCH-RSRP (PSCCH reference signal received power).

As an embodiment, the second measurement result is SL RSSI (received signal strength indicator).

As an example, the second measurement result is a SL CR (Sidelink channel occupancy ratio).

As an example, the second measurement result is SL CBR (Sidelink channel busy ratio).

As an embodiment, the third message is or comprises a measurement report.

As an embodiment, the third message is an RRC message.

As an example, the third message is or comprises MCGfailureinformation.

As an embodiment, the third message is or comprises scgfailurelnformation.

As an embodiment, the third message is or comprises UEAssistanceInformation.

As an embodiment, the transmission channel occupied by the third message is UL-SCH.

As an embodiment, the third message is not forwarded by the third node U03.

As an embodiment, the third message uses an SRB bearer.

For one embodiment, the third message includes the first link layer identity.

For one embodiment, the third message includes an index of the first link layer identity.

As one embodiment, the first message indicates a condition-based direct path to indirect path handover.

As a sub-embodiment of this embodiment, the condition-based direct path to indirect path switching refers to a condition reconfiguration for switching from a direct path to an indirect path.

As a sub-embodiment of this embodiment, the condition-based direct path to indirect path handover refers to an RLC bearer that involves reconfiguration of an RLC bearer mapped with a radio bearer, but does not involve changing the conditional reconfiguration of an existing radio bearer.

As a sub-embodiment of this embodiment, the condition-based direct path to indirect path handover refers to radio bearer reconfiguration.

As a sub-embodiment of this embodiment, the condition-based direct path to indirect path handover refers to RLC bearer reconfiguration.

As a sub-embodiment of this embodiment, the condition-based direct path to indirect path handover does not change the SpCellConfig.

As an embodiment, after the first node U01 switches from the direct path to the indirect path, the serving cell of the first node is still the second node U02.

As an embodiment, the second node U02 indicates the first threshold and the second threshold.

As one embodiment, the first message indicates the first threshold and the second threshold.

As an embodiment, when the first node U01 receives the first message, the direct path to the indirect path is not immediately switched, but when the first condition is satisfied, the direct path to the indirect path is switched.

As an embodiment, the step S5303 of forwarding the second message includes: receiving a first MAC PDU carrying the second message; extracting a first RLC PDU from the first MAC PDU, extracting a first adaptation layer PDU from the first RLC PDU, and determining that data carried by the first adaptation layer PDU is specific to an RLC channel of a Uu interface according to a header of the first adaptation layer PDU; the first adaptation layer PDU carries a first PDCP PDU which comprises the second message; and encapsulating the first PDCP PDU and sending the encapsulated first PDCP PDU to the second node U02 through a Uu interface.

As an embodiment, the step S5303 of forwarding the second message includes: and receiving the PDU carrying the second message on a sidelink, and sending the PDU carrying the second message to the second node U02.

As a sub-embodiment of this embodiment, the PDUs carrying the second message comprise PDCP PDUs.

As a sub-embodiment of this embodiment, the act of sending the PDU carrying the second message to the second node U02 includes: transmitting the PDU carrying the second message on a PUSCH channel.

As a sub-embodiment of this embodiment, the act of sending the PDU carrying the second message to the second node U02 includes: encapsulating the PDU carrying the second message in an RLC PDU.

As a sub-embodiment of this embodiment, the act of sending the PDU carrying the second message to the second node U02 includes: encapsulating the PDU carrying the second message in an adaptation layer PDU.

As a sub-embodiment of this embodiment, the act of sending the PDU carrying the second message to the second node U02 includes: encapsulating the PDU carrying the second message in a MAC PDU.

As a sub-embodiment of this embodiment, the act of sending the PDU carrying the second message to the second node U02 includes: and encapsulating the PDU carrying the second message in a PDU of a protocol layer between a PDCP layer and an RLC layer.

As an embodiment, the step S5303 of forwarding the second message includes: relaying the second message.

As an embodiment, the first node U01 maintains a conditional reconfiguration (conditional reconfiguration) evaluation for CHO and stops the evaluation for conditional switching from direct path to indirect path during the operation of the first timer.

As an example, the sentence maintains the meaning of the conditional reconfiguration evaluation against CHO includes: the running of the first timer does not affect the evaluation of the conditional reconfiguration for CHO.

As an example, the sentence maintains the meaning of the conditional reconfiguration evaluation against CHO includes: the running of the first timer does not affect the evaluation of whether the conditional reconfiguration for CHO is fulfilled.

As an example, the sentence maintains the meaning of the conditional reconfiguration evaluation against CHO includes: during the running of the first timer, the evaluation of whether the conditional reconfiguration for CHO that has been started is fulfilled is not stopped.

As an embodiment, the sentence maintaining meaning of the conditional reconfiguration evaluation against CHO comprises: during the running of the first timer, the evaluation of whether a conditional reconfiguration for CHO is fulfilled may be started.

As an example, the sentence maintains the meaning of the conditional reconfiguration evaluation against CHO includes: during the running of the first timer, a reevaluation can be made for a conditional reconfiguration of CHO.

As an embodiment, the sentence maintaining the meaning of said evaluation (evaluation) of the conditional reconfiguration for CHO comprises: it is evaluated whether the condition for the conditional reconfiguration of CHO is fulfilled.

As one embodiment, the meaning of the sentence stopping evaluation for the conditional switch from the direct path to the indirect path includes: the running of the first timer triggers the termination of the evaluation for the conditional switch from the direct path to the indirect path.

As one embodiment, the meaning of the sentence stopping evaluation for the conditional switch from the direct path to the indirect path includes: the first timer is not evaluated during its run for conditional switching from a direct path to an indirect path.

As one embodiment, the meaning of the sentence stopping evaluation for the conditional switch from the direct path to the indirect path includes: execution of the first timer causes termination of ongoing and incomplete evaluation of conditional switching for switching from a direct path to an indirect path.

As an embodiment, the meaning of the evaluation of sentence stop for conditional switching from direct path to indirect path comprises: it is evaluated whether a condition for conditional switching from the direct path to the indirect path is satisfied.

As one embodiment, the first message indicates a condition for conditional switching from a direct path to an indirect path.

As an embodiment, the first message indicates a conditional reconfiguration for CHO.

As one embodiment, the conditional switch from the direct path to the indirect path is a conditional reconfiguration from the direct path to the indirect path.

As an embodiment, the above method has a benefit that the UE can still perform the CHO type handover during the operation of the first timer, which is beneficial to ensure the service continuity of the UE.

As an embodiment, the above method has a benefit that the UE stops conditional handover from the direct path to the indirect path during the running of the first timer, which is beneficial to reduce complexity, ensure consistency of UE and network behaviors, and avoid causing unnecessary confusion.

As an embodiment, the sentence of the first message is for indicating that when the first condition is satisfied, the meaning of switching from the direct path to the indirect path is: the first condition being satisfied is used to trigger the first node to switch from a direct path to an indirect path.

As an embodiment, the first message is a sentence indicating that when the first condition is satisfied, the meaning of switching from the direct path to the indirect path is: in response to the first condition being satisfied, the first node switches from a direct path to an indirect path.

As an embodiment, the sentence of the first message is for indicating that when the first condition is satisfied, the meaning of switching from the direct path to the indirect path is: when the first condition is satisfied, the first node performs a configuration associated with the first condition relating to transmission using an indirect path.

Example 6

Embodiment 6 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in fig. 6. In fig. 6, U11 corresponds to a first node of the present application, U12 corresponds to a second node of the present application, and U13 corresponds to a third node of the present application, and it is specifically noted that the sequence in the present example does not limit the sequence of signal transmission and the sequence of implementation in the present application.

For theFirst node U11Receiving a first discovery message in step S6101; sending a third message in step S6102; receiving a first message in step S6103; in step S6104, an RRC reestablishment request message is sent.

For theSecond node U12Receiving a third message in step S6201; transmitting a first message in step S6202; an RRC reestablishment request message is received in step S6203.

For theThird node U13Transmitting a first discovery message in step S6301; forwarding the RRC reestablishment request message at step S6302; .

Embodiment 6 shows an RRC reestablishment procedure; example 6 is based on example 5, and reference can be made to example 5 for what is required but not illustrated in example 6.

As an embodiment, the RRC reestablishment includes: selecting a third node, the third node belonging to a first candidate relay list, the first candidate relay list relating to switching from a direct path to an indirect path; transmitting, by the third node, an RRC reestablishment request message using the indirect path; deleting the first candidate relay list in response to applying the first message;

wherein a first candidate cell list is retained during the first message being applied, the first candidate cell list relating to conditional reconfiguration; the first candidate cell list includes at least one cell.

As one embodiment, the first discovery message includes a relay service code.

As a sub-embodiment of this embodiment, the relay service code included in the first discovery message indicates that a relay service is supported.

As a sub-embodiment of this embodiment, the relay service code included in the first discovery message indicates that L2 relay service is supported.

As an embodiment, the first discovery message includes a cell ID of the second node U12.

As an embodiment, the first discovery message comprises the cell NCI of the second node U12.

As an embodiment, the second node U12 is a serving cell of the first node U11.

As an embodiment, the second node U12 is a serving cell of the third node U13.

As one embodiment, the third message is sent after the first discovery message is received.

As an embodiment, the reception of the first discovery message triggers the transmission of the third message.

As an embodiment, the first message indicates a conditional reconfiguration.

As an embodiment, the nodes included in the first candidate relay list are all UEs.

As an embodiment, the nodes included in the first candidate relay list are all relays.

As one embodiment, the first message indicates a conditional reconfiguration for CHO (conditional handover).

As a sub-embodiment of this embodiment, said conditional reconfiguration for CHO indicated by said first message comprises reconfigurationWithSync.

As a sub-embodiment of this embodiment, the candidate cells comprised by said conditional reconfiguration for CHO are kept in said first candidate cell list.

As a sub-embodiment of this embodiment, all candidate cells included in said conditional reconfiguration for CHO constitute said first candidate cell list.

As a sub-embodiment of this embodiment, the first candidate cell list is varconditional reconfig.

As a sub-embodiment of this embodiment, the first candidate cell list is saved in varconditional reconf.

As one embodiment, said conditional reconfiguration for CHO indicated by said first message comprises SpCellConfig.

As a sub-embodiment of this embodiment, the conditional reconfiguration indicated by the first message includes reconfigurationWithSync.

As one embodiment, the first message indicates a conditional reconfiguration for direct path to indirect path handover.

As a sub-embodiment of this embodiment, the conditional reconfiguration indicated by the first message for the direct path to the indirect path switch does not include SpCellConfig.

As a sub-embodiment of this embodiment, the conditional reconfiguration for direct path to indirect path switch indicated by the first message does not include reconfigurationWithSync.

As a sub-embodiment of this embodiment, the candidate relay nodes indicated by the first message for direct path to indirect path handover are saved in the first candidate relay list.

As a sub-embodiment of this embodiment, the candidate relay nodes for direct path to indirect path handover indicated by the first message are configured in the first candidate relay list.

As a sub-embodiment of this embodiment, the first candidate relay list is varconditional reconfig.

As a sub-embodiment of this embodiment, the first candidate relay list is saved in varconditional reconfig.

As a sub-embodiment of this embodiment, the first candidate relay list is saved in a state variable other than varconditional reconf.

As a sub-embodiment of this embodiment, the first candidate relay list includes link layer identities of candidate relays.

As a sub-embodiment of this embodiment, the first candidate relay list includes the first link layer identity.

As one embodiment, the first message notification indicates a conditional reconfiguration for CHO and a conditional reconfiguration for direct path to indirect path handover.

As an example, the conditional reconfiguration for CHO and the conditional reconfiguration for direct path to indirect path switch may have the same name or different names.

For one embodiment, the first node U11 may have a radio link failure after receiving the first message.

As an embodiment, the first node U11 is triggered RRC re-establishment after receiving the first message.

As a sub-embodiment of this embodiment, the expiration of the first timer triggers the RRC reestablishment.

As an embodiment, the RRC reestablishment includes performing relay selection, and the relay node selected by the first node U11 in the relay selection process is the third node U13.

As an embodiment, the RRC re-establishment includes performing cell selection, and the node selected by the first node U11 in the cell selection process is the third node U13.

As an embodiment, the RRC reestablishment includes performing cell and relay selection, and the node selected by the first node U11 in the cell and relay selection process is the third node U13.

As an embodiment, the phrase the meaning to which the first message is applied includes: applying the triggered conditional reconfiguration in the first message.

As an embodiment, the phrase the meaning to which the first message is applied includes: and applying the configuration of the application required by the first message due to the condition satisfaction.

As an embodiment, the phrase the meaning to which the first message is applied includes: the configuration related to the third node U13 in the first message is applied.

As an embodiment, the phrase the meaning to which the first message is applied includes: apply the configuration in the first message relating to the third node U13 being selected as relay.

As an embodiment, the phrase the meaning to which the first message is applied includes: applying a configuration in the first message relating to indirect path transmission relating to the third node U13.

As an embodiment, the meaning to which the phrase first message is applied includes: applying the configuration in the first message relating to performing an indirect path transmission through the third node U13.

As an embodiment, the RRC reestablishment request message is rrcreestablshmentirequest.

As an embodiment, the RRC reestablishment request message is an RRCConnectionReestablishmentRequest.

Example 7

Embodiment 7 illustrates a schematic diagram of a protocol stack for relay communication according to an embodiment of the present application, as shown in fig. 7.

In the protocol stack shown in fig. 7, the first protocol layers are terminated in the UE and the relay node, the relay node and the gNB node, respectively.

As an example, the UE in fig. 7 corresponds to the first node of the present application, and the relay in fig. 7 corresponds to the third node of the present application; the gNB in fig. 7 corresponds to the third node of the present application; figure 7 shows a layer 2 relay.

As an embodiment, embodiment 7 is based on embodiment 3, and further shows a protocol stack and an interface related to a relay node; in embodiment 7, the NAS is a non-access stratum, the Uu-RRC is an RRC protocol of a Uu interface, and the Uu-PDCP is a PDCP layer of the Uu interface; uu-RLC is the RLC layer of the Uu interface, uu-MAC is the MAC layer of the Uu interface, and Uu-PHY is the physical layer of the Uu interface; PC5-RLC is the RLC layer of the PC5 interface; PC5-MAC is the MAC layer of the PC5 interface; PC5-PHY is the physical layer of PC5 interface; the N2 Stack is a protocol Stack of an N2 interface, and the N2 interface is an interface between the gNB and the core network; the Uu first protocol layer is a first protocol layer of a Uu interface; PC 5-second protocol layer is the second protocol layer of the PC5 interface.

The prefix Uu-in fig. 7 represents the protocol layer of the Uu interface, as an example.

The prefix PC 5-in fig. 7 represents the protocol layer of the PC5 interface, as one embodiment.

As an embodiment, the communication interface between the UE and the gNB in fig. 7 is a Uu interface.

As an example, the communication interface between the relay and the gNB in fig. 7 is a Uu interface.

As an example, the communication interface between the UE and the relay in fig. 7 is a PC5 interface.

As an embodiment, the first protocol layer is an adaptation layer.

As an embodiment, the second protocol layer is an adaptation layer.

As an embodiment, the first protocol layer is a protocol layer between a PDCP layer and an RLC layer.

As an embodiment, the second protocol layer is a protocol layer between a PDCP layer and an RLC layer.

As an embodiment, the Uu first protocol layer is configured to multiplex data of multiple radio bearers on the same Uu-RLC bearer/entity.

As an embodiment, the PC 5-second protocol layer is configured to multiplex data of multiple radio bearers on the same PC5-RLC bearer/entity.

As an embodiment, the PC 5-second protocol layer is used for mapping of PC5-RLC bearers/entities.

As an embodiment, the first protocol layer is used to associate one or more PC5-RLC entities with a Uu-RLC entity.

For one embodiment, the second protocol layer is configured to associate one or more PC5-RLC entities with a Uu-RLC entity.

As an example, the PC5 second protocol layer in fig. 7 is an adaptation layer of the PC5 interface.

As an example, the Uu first protocol layer in fig. 7 is an adaptation layer of the Uu interface.

As an embodiment, a peer PDCP entity of the UE in fig. 7 is located in the gNB.

As an embodiment, the opposite RRC entity of the UE in fig. 7 is located in the gNB.

As an embodiment, the first signal is a signal between the UE and the relay and is generated in a PC5-PHY or a PC5-MAC or a PC5-RLC or a PC 5-second protocol layer or a PC5-RRC or a PC5-S.

As an embodiment, the second signal is a signal between the UE and the relay, and is generated in a PC5-PHY or a PC5-MAC or a PC5-RLC or a PC 5-second protocol layer or a PC5-RRC or a PC5-S.

In one embodiment, the first message is generated in the gNB and is a Uu-RRC message.

In one embodiment, the second message is generated at the first node, and the second message is a Uu-RRC message.

As one embodiment, the second message is transparent to the relay.

As an example, the UE in fig. 7 is a U2N remote UE.

As an example, the relay in fig. 7 is a U2N relay UE.

As an embodiment, the direct path refers to a direct communication path between the UE and the gNB without forwarding through the relay.

As an embodiment, when using the direct path transmission, the UE does not use the PC 5-second protocol layer, does not use the PC5-RLC layer, does not use the PC5-MAC, does not use the PC5-PHY, and is Uu-RLC, uu-MAC, uu-PHY, respectively, below the Uu-PDCP layer.

As an embodiment, switching from the direct path to the indirect path includes at least adding or modifying entities corresponding to protocol layers below the Uu-PDCP layer.

As a sub-embodiment of this embodiment, the entity corresponding to the protocol layers below the Uu-PDCP layer is at least one of the entities corresponding to the { Uu-RLC, uu-MAC, uu-PHY } layer.

As a sub-embodiment of this embodiment, switching from the direct path to the indirect path comprises associating a protocol entity corresponding to the Uu-PDCP protocol layer with said entity corresponding to said at least one protocol layer below the added or modified Uu-PDCP layer.

As an embodiment, switching from the direct path to the indirect path includes sending at least a PDCP status report.

As an embodiment, the indirect path refers to a communication path between the UE and the gNB that is forwarded through the relay.

As an example, the indirect path transmission requires at least the use of sidelink or PC5 interface transmission.

As an example, fig. 7 shows an implementation of indirect path transmission.

As an embodiment, the Uu first protocol layer in the relay carries SDUs of the PC 5-second protocol layer in the relay.

As an embodiment, the PC 5-second protocol layer in the relay carries SDUs of the Uu first protocol layer in the relay.

As an embodiment, the first signal is generated at the relay, the first signal being transmitted over a PC5 interface.

Example 8

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

The first node in embodiment 8 corresponds to the first node of the present application; the second node in example 8 corresponds to the second node of the present application; the third node in embodiment 8 corresponds to the third node of the present application; the fourth node in embodiment 8 is a cell or base station or group of cells other than the second node.

The arrow with "Path switch" in FIG. 8 indicates that the first node is switching from a direct path transmission to an indirect path transmission, where the direct path is the link where the first node communicates directly with the second node; the indirect path is a link through which the first node communicates with the fourth node through the third node; it should be noted that although fig. 8 illustrates that the fourth node is different from the second node, the method proposed in the present application is also applied to a scenario in which the fourth node and the second node are the same node; the direct path transmission and the indirect path transmission refer to between the first node and the network.

As an embodiment, the configuration of indirect path communication through the third node is part of a conditional reconfiguration of CHO for the fourth node.

As one embodiment, the first message indicates a first conditional reconfiguration for CHO for the fourth node, the first conditional reconfiguration comprising a configuration of indirect path transmission through the third node.

As a sub-embodiment of this embodiment, the CHO refers to conditional handover, and after the first node completes the conditional handover, the PCell of the first node is changed from the second node to the fourth node.

As a sub-embodiment of this embodiment, when performing the first conditional reconfiguration, the first node starts a timer T304, and the first signal is used to stop the timer T304.

As a sub-embodiment of this embodiment, when performing the first condition reconfiguration, the first node starts only the first timer, and does not start the timer T304.

As a sub-embodiment of this embodiment, when performing the first condition reconfiguration, the first node starts both the timer T304 and the first timer, and the stop of the first timer triggers the timer T304 to be stopped.

As an embodiment, the PCI of the second node is different from that of the fourth node, and the second node and the fourth node belong to or are managed by the same DU.

As an embodiment, the second node and the fourth node belong to the same group of cells.

As an embodiment, the second node and the fourth node belong to the MCG and the SCG of the first node, respectively.

As one embodiment, the first node maintains a first candidate cell list for CHO and a first candidate relay list for condition-based direct path to indirect path switching; the first candidate cell list comprises candidate cells for CHO, the first candidate relay list comprises candidate relays for condition-based path switching; the first message is used to indicate the first candidate cell list and the first candidate relay list, the first node has a radio link failure after receiving the first message, and in response to the radio link failure, the first node performs an RRC reestablishment.

As a sub-embodiment of this embodiment, the RRC reestablishment includes selecting a first cell, where the first cell belongs to the first candidate cell list, and the first node applies rrcreeconfiguration for the first cell, and as a response to the rrcreeconfiguration for the first cell by the behavior application, the first node deletes the first candidate cell list and deletes a PCell in the first candidate relay list as a relay of the first cell.

As a sub-embodiment of this embodiment, the RRC reestablishment includes selecting a first relay, the first relay belonging to the first candidate relay list, the first node applying the configuration for the first relay, as a response to the behavior applying the configuration for the first cell, the first node deleting the first candidate relay list and deleting the PCell of the first relay in the first candidate cell list.

As an embodiment, the path switching refers to stopping using direct path transmission and starting using indirect path transmission, and if no change of the SpCell is involved in the process of the path switching, the path switching is not the same as the conventional inter-cell switching (handover); if a change in the SpCell is involved in the path switch procedure, the path switch may be performed within a conventionally-meant inter-cell handover procedure; in summary, the conventional sense of inter-cell handover does not involve the path switching.

Example 9

Embodiment 9 illustrates a schematic diagram in which a first message is used for the behavior start of the first timer according to an embodiment of the present application, as shown in fig. 9.

As an embodiment, the first message is executed or applied immediately after being received, the execution or application of the first message triggering the start of the first timer.

As an embodiment, the reception of the first message triggers the start of the first counter.

As an embodiment, the application of the first message triggers the start of the first counter.

As an embodiment, execution of the first message triggers starting the first counter.

As an embodiment, the first message includes configuration information of the first timer.

As a sub-embodiment of this embodiment, the configuration information of the first timer includes an expiration time of the first timer.

As a sub-embodiment of this embodiment, the configuration information of the first timer includes a time of the first timer.

As an embodiment, the first timer is triggered by the execution of the configuration executed when a certain condition is satisfied, which is included in the first message.

As an embodiment, the first timer is triggered by an applied configuration included in the first message that satisfies a certain condition.

As an embodiment, when a conditional reconfiguration is performed, at least part of the configuration for the conditional reconfiguration included in the first message is triggered by an application to start the first timer.

As an embodiment, the configuration associated with the first condition in the first message is executed to trigger starting the first timer.

As a sub-embodiment of this embodiment, the configuration associated with the first condition is a configuration of the triggered application or execution that the first condition is satisfied.

As a sub-embodiment of this embodiment, the configuration associated with the first condition is one or several fields in the first message.

As a sub-embodiment of this embodiment, the configuration associated with the first condition is one or several information elements in the first message.

As a sub-embodiment of this embodiment, after the configuration associated with the first condition is executed or applied, the communication mode between the first node and the network is or is switched to indirect path transmission.

As a sub-embodiment of this embodiment, the first node starts the first timer in response to the configuration associated with the first condition in the first message being executed.

As a sub-embodiment of this embodiment, the start of the first timer is part of the first message in which the configuration associated with the first condition is executed.

Example 10

Embodiment 10 illustrates a block diagram of a processing apparatus for use in a first node according to one embodiment of the present application; as shown in fig. 10. In fig. 10, a processing means 1000 in a first node comprises a first receiver 1001 and a first transmitter 1002. In the case of the embodiment 10, the following description is given,

a first receiver 1001 that receives a first message used to instruct switching from a direct path to an indirect path; starting a first timer; expiration of the first timer is used to trigger an RRC reestablishment;

the first receiver 1001, after the act starts a first timer and before the first timer expires, receiving a first signal on a sidelink; stopping the first timer in response to receiving the first signal;

a first transmitter 1002 that transmits a second message, the second message being used for feeding back the first message;

As an embodiment, the first signal comprises a data packet generated by a sender of any of the first messages.

As an embodiment, the first receiver 1001 receives a first discovery message, the first discovery message including a first cell identity, the first cell identity being a cell identity of a sender of the first message; the first discovery message comprises a first link layer identity of a sender of the first signal; evaluating a first measurement result according to a first reference signal resource; evaluating a second measurement result according to a sidelink signal transmitted by a sender of the first discovery message;

the first transmitter 1002, sending a third message over the direct path, the third message being used to indicate the first link layer identity;

As an embodiment, the first receiver 1001, during the running of the first timer, maintains the conditional reconfiguration evaluation for CHO, stopping the evaluation for conditional switching from direct path to indirect path.

As an embodiment, the first receiver 1001 receives a first message used to instruct switching from a direct path to an indirect path via a third node; determining whether to start a first timer according to whether a direct link is established with the third node;

wherein the first message is transmitted over the direct path; the second message is transmitted over the indirect path via the third node; the first message and the second message are RRC messages, respectively; the second message is relayed by the third node; the first message comprises a first link layer identity, the first link layer identity comprising 24 bits; the first link layer identity is an identity of the third node; the meaning of the sentence determining whether to start the first timer according to whether the direct link is established with the third node includes:

not starting the first timer when a direct link is established with the third node;

starting the first timer when a direct link with the third node is not established;

a relay service code is used to establish the direct link; the phrase via the third node means that the third node is a relay on the indirect path.

As an embodiment, expiration of the first timer is used to trigger RRC reestablishment.

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

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

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

As an embodiment, the first node is an aircraft.

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

As an embodiment, the first node is a relay.

As an embodiment, the first node is a ship.

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

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

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

As one embodiment, the first node is a sidelink communications node.

For one embodiment, the first receiver 1001 includes at least one of the antenna 452, the receiver 454, the receive processor 456, the multiple antenna receive processor 458, the controller/processor 459, the memory 460, or the data source 467 of embodiment 4.

For one embodiment, the first transmitter 1002 includes at least one of the antenna 452, the transmitter 454, the transmit processor 468, the multi-antenna transmit processor 457, the controller/processor 459, the memory 460, or the data source 467 of embodiment 4.

Example 11

Embodiment 11 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. 11. In fig. 11, the processing means 1100 in the second node comprises a second transmitter 1101 and a second receiver 1102. In the case of the embodiment 11, however,

a second transmitter 1101 that transmits a first message used to instruct switching from the direct path to the indirect path;

a second receiver 1102 receiving a second message, the second message being used for feeding back the first message;

For one embodiment, the second receiver 1102 receives a third message over the direct path, the third message being used to indicate the first link layer identity; the first reference signal resource is used to evaluate the first measurement result; the secondary link signal is used to evaluate the second measurement;

As an embodiment, the RRC reestablishment includes: receiving, by the third node, an RRC reestablishment request message using the indirect path.

As one embodiment, the second node is a satellite.

As one embodiment, the second node is an IoT node.

As one embodiment, the second node is a relay.

For one embodiment, the second node is an access point.

As an embodiment, the second node is a base station.

For one embodiment, the second transmitter 1101 includes at least one of the antenna 420, the transmitter 418, the transmit processor 416, the multi-antenna transmit processor 471, the controller/processor 475, and the memory 476 of embodiment 4.

For one embodiment, the second receiver 1102 includes at least one of the antenna 420, the receiver 418, the receive processor 470, the multiple antenna receive processor 472, the controller/processor 475, and the memory 476 of embodiment 4.

Example 12

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

a third transmitter 1201 forwarding a second message, the second message being used for feeding back the first message;

the third transmitter 1201 transmitting a first signal on a sidelink after the act starts a first timer and before the first timer expires;

As an embodiment, the first signal comprises second signaling used to confirm that a direct link between the first node and the third node has been successfully established; the second signaling comprises a relay service code; the second signaling is a PC5-S message.

As an embodiment, the third transmitter 1201 transmits a first discovery message and a sidelink signal, where the first discovery message includes a first cell identity, and the first cell identity is a cell identity of a sender of the first message; the first discovery message comprises a first link layer identity of the third node; the first reference signal resource is used to evaluate the first measurement result; the secondary link signal is used to evaluate a second measurement;

As an embodiment, the RRC reestablishment includes: selecting the third node, the third node belonging to a first candidate relay list, the first candidate relay list relating to switching from a direct path to an indirect path; transmitting, by the third node, an RRC reestablishment request message using the indirect path; deleting the first candidate relay list in response to applying the first message;

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

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

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

As an embodiment, the third node is an aircraft.

As an embodiment, the third node is a vehicle terminal.

As an embodiment, the third node is a relay.

As an embodiment, the third node is a ship.

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

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

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

As one embodiment, the third node is a sidelink communications node.

For one embodiment, the third receiver 1202 may comprise at least one of the antenna 452, the receiver 454, the receive processor 456, the multiple antenna receive processor 458, the controller/processor 459, the memory 460, or the data source 467 of embodiment 4.

For one embodiment, the third transmitter 1201 includes at least one of the antenna 452, the transmitter 454, the transmit processor 468, the multi-antenna transmit processor 457, the controller/processor 459, the memory 460, or the data source 467 of embodiment 4.

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

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive. The scope of the invention is indicated by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalents thereof are intended to be embraced therein.

Claims

1. A first node for wireless communication, comprising:

a first receiver to receive a first message, the first message being used to instruct switching from a direct path to an indirect path; starting a first timer; expiration of the first timer is used to trigger an RRC reestablishment;

2. The first node of claim 1,

the first signal comprises a data packet generated by a sender of any of the first messages.

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

the first signal includes first signaling used to indicate that the indirect path is established.

4. The first node according to any of claims 1 to 3,

the first signal comprises second signaling used to confirm that a direct link between the first node and a sender of the first signal has been successfully established; the second signaling comprises a relay service code; the second signaling is a PC5-S message.

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

the first receiver to receive a first discovery message, the first discovery message including a first cell identity, the first cell identity being a cell identity of a sender of the first message; the first discovery message comprises a first link layer identity of a sender of the first signal; evaluating a first measurement result according to a first reference signal resource; evaluating a second measurement result from a sidelink signal transmitted by a sender of the first discovery message;

the first transmitter, sending a third message over the direct path, the third message being used to indicate the first link layer identity;

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

the RRC reestablishment comprises: selecting a third node, the third node belonging to a first candidate relay list, the first candidate relay list relating to switching from a direct path to an indirect path; transmitting, by the third node, an RRC reestablishment request message using the indirect path; deleting the first candidate relay list in response to applying the first message;

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

the first receiver, during operation of the first timer, maintains a conditional reconfiguration evaluation for CHO, ceasing evaluation for conditional switching from direct path to indirect path.

8. A second node for wireless communication, comprising:

9. A third node for wireless communication, comprising:

the third transmitter, after the act begins a first timer and before the first timer expires, transmitting a first signal on a sidelink;

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

receiving a first signal on a sidelink after the act starts a first timer and before the first timer expires; stopping the first timer in response to receiving the first signal;

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

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