CN116567756A

CN116567756A - Method and apparatus for wireless communication

Info

Publication number: CN116567756A
Application number: CN202210110809.4A
Authority: CN
Inventors: 陈宇; 张晓博
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-01-29
Filing date: 2022-01-29
Publication date: 2023-08-08

Abstract

A method and apparatus for wireless communication are disclosed, including receiving first signaling, performing the first signaling, the first signaling being used to indicate a first reconfiguration for a first group of cells; determining whether to transmit a first signal on a sidelink based on whether all conditions in a first set of conditions are met and whether the first cell group is a master cell group or a slave cell group; according to the method and the device, whether the first signal is sent or not is determined reasonably, network optimization is facilitated, communication reliability is improved, and communication interruption is avoided.

Description

Method and apparatus for wireless communication

Technical Field

The present invention relates to a transmission method and apparatus in a wireless communication system, and in particular, to a method and apparatus for optimizing a network in communication, improving service quality, reducing service interruption and dropped calls, and relaying communications.

Background

Future wireless communication systems have more and more diversified application scenes, and different application scenes have different performance requirements on the system. To meet the different performance requirements of various application scenarios, a New air interface technology (NR) is decided to be researched in the 3GPP (3 rd Generation Partner Project, third Generation partnership project) RAN (Radio Access Network ) #72 times of the whole meeting, and standardized Work is started on NR by the 3GPP RAN #75 times of the whole meeting through the WI (Work Item) of NR.

In communication, both LTE (Long Term Evolution ) and 5G NR can be involved in reliable accurate reception of information, optimized energy efficiency ratio, determination of information validity, flexible resource allocation, scalable system structure, efficient non-access layer information processing, lower service interruption and disconnection rate, support for low power consumption, which is significant for normal communication between a base station and a user equipment, reasonable scheduling of resources, balancing of system load, so that it can be said as high throughput, meeting communication requirements of various services, improving spectrum utilization, improving a base stone of service quality, whether embbe (ehanced Mobile BroadBand, enhanced mobile broadband), URLLC (Ultra Reliable Low Latency Communication, ultra-high reliability low latency communication) or eMTC (enhanced Machine Type Communication ) are indispensable. Meanwhile, in the internet of things in the field of IIoT (Industrial Internet of Things), in V2X (vehicle to X) communication (Device to Device) in the field of industry, in communication of unlicensed spectrum, in monitoring of user communication quality, in network planning optimization, in NTN (Non Territerial Network, non-terrestrial network communication), in TN (Territerial Network, terrestrial network communication), in dual connectivity (Dual connectivity) system, in radio resource management and codebook selection of multiple antennas, in signaling design, neighbor management, service management, and beamforming, there is a wide demand, and the transmission modes of information are broadcast and unicast, both transmission modes are indispensable for 5G system, because they are very helpful to meet the above demands.

With the increasing of the scene and complexity of the system, the system has higher requirements on reducing the interruption rate, reducing the time delay, enhancing the reliability, enhancing the stability of the system, and the flexibility of the service, and saving the power, and meanwhile, the compatibility among different versions of different systems needs to be considered in the system design.

The 3GPP standardization organization performs related standardization work for 5G to form a series of standards, and the standard content can be referred to:

https://www.3gpp.org/ftp/Specs/archive/38_series/38.211/38211-g60.zip

https://www.3gpp.org/ftp/Specs/archive/38_series/38.213/38213-g60.zip

https://www.3gpp.org/ftp/Specs/archive/38_series/38.331/38331-g60.zip

disclosure of Invention

In various communication scenarios, the use of relay may be involved, for example, when one UE (User Equipment) is at the cell edge and coverage is poor, the network may be accessed through the relay, and the relay node may be another UE. The relay mainly comprises a layer 3 relay and a layer 2 relay (L2U 2N relay), which are used for providing network access service for a remote node (U2N 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; while layer 2 relay, remote node (U2N remote UE) and access network (RAN) have RRC connection, the access network can manage the remote node, and radio bearers can be established between the access network and the remote node. The relay may be another UE, and in a system supporting layer 2 relay, the UE may communicate with the network through an L2 relay UE (L2U 2N relay UE), that is, using an indirect path (direct path), or may communicate with the network directly without relay, that is, using a direct path (direct path). In some scenarios, one UE may also use both the direct and indirect paths to achieve better reliability and higher throughput. Both the remote node and the L2 relay UE may be mobile, and the movement of the remote node and the L2 relay UE may be independent of each other. The movement of the L2 relay UE may trigger a cell handover, a path switch or a cell reselection. In the prior art, when the L2 relay UE performs the above actions, interruption of communication of the remote node will be caused. However, as much as possible to ensure continuity of communication, reducing interruption is important for wireless communication systems. But if this is not taken care of, it may lead to more serious problems for the remote UE, such as a fact that a break has occurred but it cannot be found immediately. How to guarantee the continuity of the communication of the remote node to the greatest extent, and at the same time assist the remote node to perform the re-establishment of the connection or the re-selection of the relay as soon as possible if necessary, is a problem to be solved.

Of course, the solution proposed by the present application may also solve other problems in the communication system, without being limited to the above.

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

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

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

receiving first signaling, performing the first signaling, the first signaling being used to indicate a first reconfiguration for a first group of cells;

determining whether to transmit a first signal on a sidelink based on whether all conditions in a first set of conditions are met and whether the first cell group is a master cell group or a slave cell group;

wherein the first reconfiguration includes at least one of a cell handover and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; one condition of the first set of conditions includes: at least one U2N remote UE is connected with the first node; the sentence is based on whether all conditions in the first set of conditions are met and whether the first cell group is a master cell group or a slave cell group, the meaning of determining whether to send the first signal on the sidelink is: transmitting a first signal when all conditions in the first set of conditions are satisfied and the first cell group is a primary cell group; when the first cell group is a cell group or at least one condition of the first set of conditions is not satisfied, no first signal is sent.

As one embodiment, the problems to be solved by the present application include: in the scenario of using L2 relay, when a link condition change occurs, for example, when a mobility event occurs, how to assist the remote UE in performing the corresponding processing. .

As one example, the benefits of the above method include: and continuing the relay service when the wireless link supporting the L2 relay UE changes. The method is beneficial to reducing the service continuity of the remote node, namely the remote UE, simultaneously beneficial to the connection reestablishment or cell/relay reselection of the remote UE in time, beneficial to improving the service quality and increasing the coverage.

Specifically, according to one aspect of the present application, a first timer is started in response to performing the first signaling;

wherein the first signaling is RRC signaling, the first signaling includes a first domain, the first domain includes a second domain, and the second domain is a reconfigurationwisync; the first domain is related to whether the first cell group is a master cell group or a slave cell group; the first cell group is a master cell group when the first domain is a masterCellGroup, and a slave cell group when the first domain is a secondaryccellgroup; the second field is used to indicate an expiration value of the first timer; expiration of the first timer is used to trigger RRC reestablishment.

Specifically, according to one aspect of the present application, second signaling is received;

wherein the second signaling is control signaling below the RRC layer, the second signaling being used to trigger the action to perform the first signaling.

Specifically, according to one aspect of the present application, third signaling is received, the third signaling including the first signaling and a first set of execution conditions;

wherein at least one condition of the first set of execution conditions is satisfied and is used to trigger the behavior to execute the first signaling; the first signaling is associated with the first set of execution conditions; the first set of execution conditions includes: the first measurement satisfies a first threshold.

Specifically, according to one aspect of the present application, cell reselection is performed and a first cell is selected; determining whether to send a second signal on a sidelink or not according to the gNB to which the first cell belongs;

wherein the cell in which the first node resides before the act performs cell reselection is a second cell; the reason why the second signal is used to indicate that the second signal is sent is that cell reselection occurs, and the sentence is that, according to the gNB to which the first cell belongs, whether the second signal is sent on the sidelink is determined by: when the gNB to which the first cell belongs is different from the gNB to which the second cell belongs, a second signal is sent; and when the gNB to which the first cell belongs is the same as the gNB to which the second cell belongs, not transmitting a second signal.

Specifically, according to one aspect of the present application, a radio link failure of the first radio link is detected;

determining whether to send a third signal based on whether the first wireless link is a wireless link between the first node and a master cell group or a wireless link between the first node and a cell group;

wherein the third signal is higher layer signaling; the third signal is used to indicate that the reason for sending the third signal is that the first radio link fails in radio link, and the sentence is that whether to send the third signal is determined according to whether the first radio link is a radio link between the first node and a master cell group or a radio link between the first node and a cell group, which means that: transmitting a third signal when the first wireless link is a wireless link between the first node and a primary cell group; when the first wireless link is a wireless link between the first node and a cell group, no third signal is sent.

Specifically, according to one aspect of the present application, a radio link failure of the second radio link is detected; the second wireless link is a wireless link between the first node and a fourth node; the fourth node is a remote UE;

Transmitting a fourth signal; the first node is a relay between a receiver of the fourth signal and the fourth node;

wherein relaying the fourth signal between a receiver and the fourth node is used to indicate that the reason for transmitting the fourth signal is that a radio link failure occurred; the fourth signal includes a first SCI and a first MAC PDU, the first SCI including N bits of an identity of the receiver of the fourth signal and a header of the first MAC PDU including bits other than the N bits of the identity of the receiver of the fourth signal; n is a positive integer.

Specifically, according to one aspect of the present application, the first condition set includes: the first reconfiguration includes: stopping using the direct path;

wherein the phrase ceasing to use the direct path includes at least one of releasing a bearer associated with the direct path, suspending the bearer associated with the direct path, and transitioning from the direct path to the indirect path.

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

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

Specifically, according to one aspect of the present application, the first node is a U2N relay UE.

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

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

Specifically, according to one aspect of the present application, the first node is a mobile phone.

Specifically, according to one aspect of the present application, the first node is a communication terminal supporting multi-SIM card communication.

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

receiving a first signal on a sidelink; performing a first operation according to an RRC state in response to receiving the first signal;

wherein a sender of the first signal receives first signaling in a main link and performs the first signaling; the first signaling is used to indicate a first reconfiguration for a first group of cells; the first cell group is a master cell group; the first reconfiguration includes at least one of a cell switch and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; the second node is a U2N remote UE connected to a sender of the first signal; the meaning of the sentence performing the first operation according to the RRC state is: the first operation is connection reestablishment when the second node is in an RRC connected state; the first operation is relay reselection when the second node is in an RRC idle state or an RRC inactive state; the RRC state of the second node is one of an RRC connected state, an RRC idle state, and an RRC inactive state.

Specifically, according to one aspect of the present application, a second signal is received, which is used to indicate that the reason for transmitting the second signal is that a cell reselection occurred.

Specifically, according to one aspect of the present application, a third signal is received, the third signal being used to indicate that the reason for transmitting the third signal is that the first radio link has failed.

Specifically, according to one aspect of the present application, a fourth signal is received, the fourth signal being used to indicate that the reason for transmitting the fourth signal is that a radio link failure occurred; the second wireless link is a wireless link between a sender of the fourth signal and a fourth node; the fourth node is a remote UE; the fourth signal includes a first SCI and a first MAC PDU, the first SCI including N bits of an identity of the second node and a header of the first MAC PDU including bits other than the N bits of the identity of the second node; n is a positive integer.

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

Specifically, according to one aspect of the present application, the second node is a relay.

Specifically, according to one aspect of the present application, the second node is a U2N remote UE.

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

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

Specifically, according to one aspect of the present application, the second node is a mobile phone.

In particular, according to one aspect of the present application, the second node is a communication terminal supporting multi-SIM card communication.

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

a first receiver that receives first signaling, the first signaling being performed, the first signaling being used to indicate a first reconfiguration for a first group of cells;

a first transmitter that determines whether to transmit a first signal on a sidelink based on whether all conditions in a first set of conditions are satisfied and whether the first cell group is a master cell group or a slave cell group;

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

a second receiver that receives the first signal on the sidelink; performing a first operation according to an RRC state in response to receiving the first signal;

As an example, compared to the conventional solution, the present application has the following advantages:

Support relay, especially processing when L2U 2N relay UE undergoes link change when L2U 2N (UE to Network) relay UE is used.

The normal communication of the remote UE can be ensured not to be influenced to the greatest extent.

The L2U 2N relay UE is supported to connect to the network using both the direct path and the indirect path.

The supporting L2U 2N relay UEs are both relay and remote nodes.

The L2U 2N relay UE is supported to use both MCG and SCG.

When the L2U 2N relay UE does not continue to perform relay service, the remote UE, i.e., the remote node, may be assisted to initiate connection reestablishment or cell/relay reselection as soon as possible.

In the method proposed in the present application, the reception reconfiguration with sync is not a sufficient condition for notifying the remote UE, and since the remote UE is likely to need to disconnect after receiving the notification and perform connection reestablishment or reselection relay, the method proposed in the present application notifies the remote UE only when necessary, that is, when the received reconfiguration with sync does affect the direct path, so that continuity of communication of the remote UE can be guaranteed to the greatest extent, and unnecessary interruption is avoided.

Drawings

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

FIG. 1 illustrates a flow chart of receiving first signaling, determining whether to send a first signal on a sidelink based on whether all conditions in a first set of conditions are met and whether a first cell group is a master cell group or a slave cell group, according to one embodiment of the present application;

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

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

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

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

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

FIG. 7 illustrates a schematic diagram of a protocol stack for relaying communications according to one embodiment of the present application;

FIG. 8 shows a schematic diagram of a topology according to one embodiment of the present application;

FIG. 9 shows a schematic diagram of a topology according to one embodiment of the present application;

fig. 10 shows a schematic diagram in which first signaling is used to indicate a first reconfiguration for a first cell group according to one embodiment of the present application;

FIG. 11 illustrates a schematic diagram of a processing device for use in a first node according to one embodiment of the present application;

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

Description of the embodiments

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

Example 1

Embodiment 1 illustrates a flow chart for receiving a first signal according to one embodiment of the present application, determining whether to send a first signal on a sidelink based on whether all conditions in a first set of conditions are met and whether the first cell group is a master cell group or a slave cell group, as shown in fig. 1. In fig. 1, each block represents a step, and it is emphasized that the order of the blocks in the drawing does not represent temporal relationships between the represented steps.

In embodiment 1, a first node in the present application receives a first signaling in step 101, determines in step 102 whether all conditions in a first condition set are satisfied and whether a first cell group is a primary cell group, and sends a first signal in step 103;

Wherein the first signaling is used to indicate a first reconfiguration for a first group of cells; the first reconfiguration includes at least one of a cell switch and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; one condition of the first set of conditions includes: at least one U2N remote UE is connected with the first node; the sentence is based on whether all conditions in the first set of conditions are met and whether the first cell group is a master cell group or a slave cell group, the meaning of determining whether to send the first signal on the sidelink is: transmitting a first signal when all conditions in the first set of conditions are satisfied and the first cell group is a primary cell group; when the first cell group is a cell group or at least one condition of the first set of conditions is not satisfied, no first signal is sent.

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

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

As an embodiment, the first node is in an RRC idle state or an RRC inactive state.

As an embodiment, the direct path refers to a UE-to-network transmission path, by which data is transmitted between a remote UE of the UE-to-network (U2N) and the network without being relayed.

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

As a sub-embodiment of this embodiment, the data comprises RRC 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 includes only signaling or data carried by RBs (radio bearers).

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

As a sub-embodiment of this embodiment, the data comprises RRC signaling.

As an embodiment, a wireless link is either the direct path or the indirect path.

As one embodiment, a U2N relay UE refers to a UE that provides functionality to support the connection of a U2N remote UE to a network.

As one embodiment, a U2N remote UE refers to a UE that needs to communicate with a network via a U2N relay UE.

As one embodiment, a U2N remote UE refers to a UE that communicates with a network supporting relay services.

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

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

As an embodiment, when the U2N remote UE is in an RRC idle state or an 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 an embodiment, not transmitting over a direct path is equal to transmitting over an indirect path.

As one embodiment, not transmitting over a direct path includes transmitting over a relay.

As one embodiment, transmitting over a direct path is or includes transmitting without relaying.

As one embodiment, transmitting over the direct path is or includes forwarding without relaying.

As one embodiment, the U2N relay UE is a UE that provides functionality (functionality) support for a U2N remote UE to connect to a network.

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 services to the network for the U2N remote UE.

As one embodiment, the U2N remote UE is a UE that communicates with the network through a U2N relay UE.

As one embodiment, a direct mode is a mode using the direct path.

As one embodiment, the direct mode is a mode in which the U2N remote UE communicates with the network using the direct path.

As an embodiment, the direct mode is a mode in which the U2N remote UE uses the direct path to transmit RRC signaling or establish an RRC connection with the network.

As one embodiment, the indirect (indirect) mode is a mode using the indirect path.

As an embodiment, the indirect mode is a mode using the indirect path.

As one embodiment, the direct mode is a mode in which the U2N remote UE communicates with the network using the indirect path.

As an embodiment, the direct mode is a mode in which the U2N remote UE uses the indirect path to transmit RRC signaling or establish an RRC connection with the network.

As an embodiment, the serving cell is or includes a cell in which the UE resides. Performing a cell search includes the UE searching for a suitable (subscriber) cell of the selected PLMN (Public land mobile Network ) or SNPN (Stand-alone Non-Public Network), selecting the suitable cell to provide available service, monitoring a control channel of the suitable cell, which is defined as camping on the cell; that is, a camped cell, with respect to the UE, is the serving cell for the UE. Camping on one cell in RRC idle state or RRC inactive state has the following benefits: such that the UE may 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 perform initial access on the control channel of the camping cell; the network may page to the UE; so that the UE can receive ETWS (Earthquake and Tsunami Warning System, earthquake tsunami warning system) and CMAS (Commercial Mobile Alert System ) notifications.

As an embodiment, for a U2N remote node, the serving cell is or includes the cell in which the U2N relay resides or is connected.

As an embodiment, for a UE in RRC connected state without CA/DC (carrier aggregation/dual connectivity ) configuration, only one serving cell includes the primary cell. For UEs in RRC connected state that are CA/DC (carrier aggregation/dual connectivity ) configured, the serving Cell is used to indicate the set of cells including the Special Cell (SpCell) and all the secondary cells. The Primary Cell (Primary Cell) is a MCG (Master Cell Group) Cell, operating on the Primary frequency, on which the UE performs an initial connection establishment procedure or initiates connection re-establishment. For the dual connectivity operation, the special Cell refers to a PCell (Primary Cell) of MCG or a PSCell (Primary SCG Cell) of SCG (Secondary Cell Group); if not dual connectivity operation, the special cell is referred to as a PCell.

As an example, the frequency at which the SCell (Secondary Cell, slave Cell) operates is the slave frequency.

For one embodiment, the individual content of the information element is referred to as a field.

As an example, 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, including SpCell, and optionally, one or more scells, in MR-DC.

As an example, PCell is SpCell of MCG.

As one example, PSCell is the SpCell of SCG.

As an embodiment, in MR-DC, the radio access node that does not provide control plane connection to the core network, 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 the slave node is SCG (secondary cell group, slave cell group), including SpCell and, optionally, one or more scells.

As one embodiment, the access layer function that enables V2X (Vehicle-to-evaluation) communications defined in 3GPP standard TS 23.285 is V2X sidelink communications (V2X sidelink communication), which occur between nearby UEs and which use E-UTRA technology but do not traverse network nodes.

As one embodiment, at least the access layer function enabling V2X (Vehicle-to-evaluation) communications defined in 3GPP standard TS 23.287 is NR sidelink communications (NR sidelink communication), where the NR sidelink communications occur between two or more UEs in close proximity and use NR technology but do not traverse a network node.

As one embodiment, the sidelink is a direct communication link between UE-to-UEs using sidelink resource allocation patterns, physical layer signals or channels, and physical layer procedures.

As an example, not or not within or outside of the coverage is equal to the coverage.

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

As an embodiment, the out-of-coverage is equal to the out-of-coverage.

As an 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 communication link or channel or bearer used when transmitting over the direct path.

As an embodiment, the direct path transmission refers to that data carried by at least 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 refers to that RLC bearers associated with at least SRBs (Signaling radio bearer, signaling radio bearers) between the UE and the network are terminated by the UE and the network, respectively.

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

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

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

As an embodiment, the direct path transmission refers to a MAC layer where 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 refers to the presence of a logical channel and/or a transport channel between the UE and the network.

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

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

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

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

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

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

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

As an embodiment, the indirect path transmission refers to a MAC layer where a Uu interface does not exist between the UE and the network.

As an embodiment, the indirect path transmission refers to a physical layer where no Uu interface exists between the UE and the network.

As an embodiment, the indirect path transmission refers to that there is no logical channel or no transmission 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 phrase UE and the UE in the network comprise the first node.

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

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

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

as an embodiment, when direct path transmission is used, no other protocol layer exists between the PDCP layer and RLC layer of the first node; when indirect path transmission is used, 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 other 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 indirect path transmission is used, the network does not directly schedule uplink transmission of the first node through DCI.

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

As an embodiment, when using direct path transmission, there is a mapping relationship between the SRB of the first node and the RLC entity of the 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, a direct path and/or an indirect path exists between the first node and the network.

As one embodiment, path switching (path switch) includes switching from a direct path to an indirect path, switching from an indirect path to/associated with one relay to an indirect path to/associated with another relay, switching between direct and indirect paths inside the same gNB; conversion between direct paths and indirect paths between different gnbs, conversion of indirect paths to indirect paths between different gnbs.

As an embodiment, the meaning of converting from a direct path to an indirect path is: the indirect path starts to be used while the direct path stops to be used.

As an embodiment, the meaning of converting from a direct path to an indirect path is: the indirect path transmission is started while the direct path transmission is stopped.

As an embodiment, the meaning of converting from a direct path to an indirect path is: from direct path transmission to indirect path transmission.

As an embodiment, the meaning of converting from a direct path to an indirect path is: the first node associates an SRB with an RLC entity of a PC5 interface while releasing the RLC entity of the Uu interface associated with the SRB.

As an embodiment, the meaning of converting from a direct path to an indirect path is: the first node associates SRBs and DRBs with RLC entities of the PC5 interface while releasing RLC entities of the Uu interface associated with the SRBs and DRBs.

As an embodiment, the meaning of converting from an indirect path to a direct path is: the direct path starts to be used while the indirect path stops to be used.

As an embodiment, the meaning of converting from an indirect path to a direct path is: direct path transmission is started while indirect path transmission is stopped.

As an embodiment, the meaning of converting from an indirect path to a direct path is: from indirect path transmission to direct path transmission.

As an embodiment, the meaning of converting from an indirect path to a direct path is: the first node releases the RLC entity of the PC5 interface associated with the SRB while associating the SRB with the RLC entity of the Uu interface.

As an embodiment, the meaning of converting from an indirect path to a direct path is: the first node releases all RLC entities of the PC5 interface associated with the DRB while associating the DRB with RLC entities of the Uu interface.

As an embodiment, the first node supports an indirect path to indirect path conversion.

As an embodiment, when the first node uses an indirect path, the relay used by the indirect path is a first relay.

As an embodiment, the relay in the present application refers to a U2N relay UE.

As an embodiment, the first node is an L2U 2N relay UE.

As an embodiment, the first node uses DC (dual connectivity ).

As an embodiment, the first node is configured with DC (dual connectivity ).

As an embodiment, the first node in this application connects two cell groups, namely a Master Cell Group (MCG) and a Slave Cell Group (SCG).

As an embodiment, the first node in the present application uses both a direct path and an indirect path.

As an embodiment, the first node in the present application uses only a direct path.

As an embodiment, the first signaling is RRC signaling.

As one embodiment, the first signaling includes SIB12.

As an embodiment, the first signaling comprises rrcrecon configuration.

As an embodiment, the first signaling includes ReconfigurationWithSync.

As an embodiment, the first signaling includes cellgroupconfig.

As an embodiment, the first signaling includes masterCellGroup.

As an embodiment, the first signaling includes a second signaling group.

As an embodiment, the first signaling is a MAC CE (Control element).

As an embodiment, the first signaling is DCI (downlink control information ).

As an embodiment, the first signaling is performed immediately after being received.

As an embodiment, the first signaling is not performed immediately after being received.

As an embodiment, the first signaling is stored first after being received and is not executed immediately.

As a sub-embodiment of this embodiment, the first signaling is stored in a state variable.

As a sub-embodiment of this embodiment, the condition that the first signaling is performed includes receiving an instruction indicating execution, or meeting a certain condition.

As an embodiment, the first signaling is an rrcrecon configuration message.

As an embodiment, the first signaling is an rrcrecon configuration message encapsulated by one container.

As an embodiment, the first signaling is a reconfigurated wistsync cell encapsulated by a container.

As an embodiment, the first signal is sent only on the secondary link.

As an embodiment, the act of sending the first signal on the sidelink (sidelink) means that: the secondary link is relative to the primary link, which is the link between one UE and the network; the sidelink is a link for one UE to another UE.

As an embodiment, the act of sending the first signal on the sidelink means that: the first signal occupies resources of a secondary link.

As an embodiment, the act of sending the first signal on the sidelink means that: the sidelink is a link between UEs.

As an embodiment, the act of sending the first signal on the sidelink means that: the sidelink is a direct link (direct link) between UEs.

As an embodiment, the act of sending the first signal on the sidelink means that: the bearer used by the message comprised by the first signal is a sidelink SRB.

As an embodiment, the act of sending the first signal on the sidelink means that: the message comprised by the first signal is sent using the PC5 interface.

As an embodiment, the first signal comprises SCI (sidelink control information ) transmitted on the sidelink.

As an embodiment, the first signal comprises a MAC PDU (Protocol Data Unit ) sent on a sidelink.

As an embodiment, the first signal is higher layer (upper layer) signaling.

As an embodiment, the first signal comprises an RRC message.

As a sub-embodiment of this embodiment, the RRC message included in the first signal is a PC5-RRC message.

As an embodiment, the first signal includes a notifiationessagesidelink message.

As an embodiment, the first signal comprises a message of the NAS layer or a PC5-S message.

As an embodiment, the first signal comprises a DIRECT LINK RELEASE REQUEST.

As an embodiment, the first signal comprises DIRECT LINK MODIFICATION REQUEST.

As an embodiment, the first signal comprises direct_communication_release.

As an embodiment, the first signal comprises a link release message.

As an embodiment, the first signal comprises a link modification message.

As an embodiment, the first signal comprises a discovery message.

As a sub-embodiment of this embodiment, the discovery message is for a U2N relay service.

As an embodiment, the meaning of the sentence that the first reconfiguration includes at least one of cell switching and path switching is: the first reconfiguration includes cell switching and does not include path switching.

As an embodiment, the meaning of the sentence that the first reconfiguration includes at least one of cell switching and path switching is: the first reconfiguration does not include a cell handover including a path switch.

As an embodiment, the meaning of the sentence that the first reconfiguration includes at least one of cell switching and path switching is: the first reconfiguration includes a cell handover including a path switch.

As an embodiment, the first reconfiguration includes at least one domain.

As an embodiment, the first reconfiguration includes at least one cell of an RRC message.

As an embodiment, the first reconfiguration is for MCG or the first reconfiguration is for SCG.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: the first reconfiguration indicates a destination cell.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: the first reconfiguration includes a system message of the destination cell.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: the first reconfiguration indicates random access resources of the destination cell.

As an embodiment, the first reconfiguration includes a cell handover or path switching meaning or includes: the first reconfiguration indicates a new identity.

As a sub-embodiment of this embodiment, the first reconfiguration includes a newUE-Identity for indicating the new Identity, which is a C-RNTI (radio network temporary Identity, radio Network Tempory Identity).

As a sub-embodiment of this embodiment, the new identity is the C-RNTI of the first node at the destination cell.

As a sub-embodiment of this embodiment, the first reconfiguration includes a newUE-Identity for indicating the Identity of the cell at the first node.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: if the T316 timer is running, the T316 timer is stopped.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: the T312 timer for the first cell group is stopped.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: a T304 timer for the first cell group is started.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: the first reconfiguration indicates downlink frequency information in which SSB (synchronization signal block ) frequencies of the target cell are located.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: performing the first reconfiguration includes synchronizing with a cell indicated by the first reconfiguration.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: performing the first reconfiguration includes reading a system message of a cell indicated by the first reconfiguration.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: the first reconfiguration includes spCellConfig.

As an embodiment, the first reconfiguration includes that the meaning of cell handover is or includes: the first reconfiguration includes spCellConfigCommon.

As a sub-embodiment of this embodiment, the spCellConfigCommon field is used to indicate a common configuration for SpCell (special cell), which is PCell or PSCell.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: the first reconfiguration is or includes sl-PathSwitchConfig.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: the first reconfiguration includes targetRelayUEIdentity for indicating an identity of the destination relay UE.

As a sub-embodiment of this embodiment, the sl-PathSwitchConfig included in the first reconfiguration includes the targetRelayUEIdentity.

As a sub-embodiment of this embodiment, the first node considers the relay UE indicated by the targetraceyueidentity as a destination relay UE in response to receiving or performing the first reconfiguration.

As an embodiment, the first node starts a second timer in response to receiving or performing the first reconfiguration, the second timer being a timer other than T304.

As a sub-embodiment of this embodiment, the stop condition of the second timer includes receiving a signal of the relay UE indicated by targetraceyueidentity on the sidelink.

As a sub-embodiment of this embodiment, expiration of the second timer is used to trigger connection reestablishment.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: at least one secondary link RLC bearer is added, the added at least one secondary link RLC bearer being for carrying at least SRB1.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: at least one secondary link RLC bearer is added, the added at least one secondary link RLC bearer being for carrying at least one DRB.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: at least one secondary link RLC bearer is activated, the added secondary link RLC bearer being for carrying at least SRB1.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: at least one secondary link RLC bearer is activated, the at least one secondary link RLC bearer being activated for carrying at least one DRB.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: and releasing the RLC bearer, wherein the released RLC bearer is used for bearing at least SRB1.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: and releasing all RLC bearers used for bearing the DRB.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: the RLC bearer is deactivated, the deactivated RLC bearer being for carrying at least SRB1.

As an embodiment, the first reconfiguration includes a path switch meaning or includes: all RLC bearers for carrying DRBs are deactivated.

As an embodiment, the first reconfiguration indicates either a cell handover or a path switch.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the first signal explicitly indicates a reason for transmitting the first signal.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the indication type field included in the first signal indicates a reason for initiating transmission of the first signal.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the cause field included in the first signal indicates a reason for initiating transmission of the first signal.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: when the first reconfiguration is received, the reason for transmitting the first signal, indicated by the first signal, is that a synchronous reconfiguration is received (reconfiguration with sync).

As a sub-embodiment of this embodiment, the first reconfiguration is or includes a reconfigurationWithSync field.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: when the first reconfiguration is not received, the reason for transmitting the first signal, indicated by the first signal, is not that a synchronous reconfiguration is received.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the first signal indicates that the reason for transmitting the first signal is that the first reconfiguration was received.

As a sub-embodiment of this embodiment, the first reconfiguration is for MCG.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the reason why the first signal indicates that the first signal is transmitted is that the first reconfiguration is performed.

As a sub-embodiment of this embodiment, the first reconfiguration is for MCG.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the first signal indicates that the reason for transmitting the first signal is that the first reconfiguration for MCG was received or performed.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the first signal indicates that the reason for transmitting the first signal is the first reconfiguration, which is reconfiguration with sync.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the first signal indicates that the reason for sending the first signal is for the first reconfiguration of the MCG, which is reconfiguration with sync.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the first signal indicates that the reason for transmitting the first signal is the first reconfiguration for cell handover of MCG, which is reconfiguration with sync.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the first signal indicates that the reason for sending the first signal is the first reconfiguration for path switching of MCG, which is reconfiguration with sync.

As an embodiment, the sentence the first signal is used to indicate that the reason for transmitting the first signal has a meaning related to the first reconfiguration that is or comprises: the indication type field included in the first signal is set to a relay ue-HO to indicate that the reason for transmitting the first signal is the first reconfiguration, which is reconfiguration with sync.

As an embodiment, the first reconfiguration is reconfiguration with sync in the sense that the first reconfiguration is a reconfigurationWithSync field included in the first signaling.

As an embodiment, the first reconfiguration is for MCG.

As an embodiment, the first reconfiguration is for a cell handover of the MCG.

As an embodiment, the first reconfiguration is for path switching of the MCG.

As an embodiment, the phrase that there is at least one U2N remote UE connected to the first node means that: there is at least one U2N remote UE establishing a direct link with the first node.

As an embodiment, the phrase that there is at least one U2N remote UE connected to the first node means that: there is at least one U2N remote UE establishing a direct link with the first node for U2N relay.

As an embodiment, the phrase that there is at least one U2N remote UE connected to the first node means that: there is at least one U2N remote UE establishing a PC5 RRC connection with the first node.

As an embodiment, the phrase that there is at least one U2N remote UE connected to the first node means that: there is at least one U2N remote UE establishing a PC5 RRC connection for relay with the first node.

As an embodiment, the phrase that there is at least one U2N remote UE connected to the first node means that: at least one U2N remote UE is being served, the act of being served comprising providing UE-to-network relay services to the U2N remote UE.

As an embodiment, the phrase that there is at least one U2N remote UE connected to the first node means that: at least one U2N remote UE accesses to a network through the first node.

As an embodiment, the phrase that there is at least one U2N remote UE connected to the first node means that: the list of served U2N remote UEs is not empty.

As an embodiment, the phrase that there is at least one U2N remote UE connected to the first node means that: the list of served U2N remote UEs is maintained to include at least one item.

As an embodiment, the first condition set includes: the first reconfiguration includes: stopping using the direct path;

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes ceasing to use the direct path to the MCG.

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes releasing at least SRB for the MCG.

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes suspending at least SRB for the MCG.

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes releasing at least the DRB for the MCG.

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes suspending at least a DRB for the MCG.

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes releasing at least SRB1 for the MCG.

As a sub-embodiment of this embodiment, the act of stopping using the direct path refers to or includes suspending at least SRB1 for the MCG.

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes performing a cell handover for the MCG.

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes changing the direct path to the primary cell to the direct path to the destination cell.

As a sub-embodiment of this embodiment, the act of ceasing to use the direct path refers to or includes performing a cell handover for the PCell.

As an embodiment, the first signal need not be sent when the first reconfiguration indicates that the first node is connected to the network through a U2N relay, but the direct path of the first node is not released.

As a sub-embodiment of this embodiment, the meaning that the direct path is not released includes: the RLC bearer of the Uu interface associated with SRB1 is not released or suspended.

Typically, when the path conversion indicated by the first reconfiguration only includes conversion of an indirect path to an indirect path, releasing the indirect path, adding the indirect path, and converting the indirect path to one of the direct paths, and not including conversion of the direct path to the indirect path or conversion of the direct path to another direct path, the first reconfiguration does not trigger transmission of the first signal.

As a sub-embodiment of this embodiment, the direct path is for MCG.

As a sub-embodiment of this embodiment, the direct path is for PCell.

As a sub-embodiment of this embodiment, the direct path is not for SCG.

As one embodiment, transitioning from the direct path to the indirect path includes stopping RLC bearers using the Uu interface and starting RLC bearers using the sidelink.

As an embodiment, transitioning from the direct path to the indirect path includes releasing or suspending or deactivating RLC bearers of the Uu interface for carrying the first radio bearer, and activating or adding RLC bearers of the sidelink for carrying the first radio bearer.

As a sub-embodiment of this embodiment, the first radio bearer comprises an SRB.

As a sub-embodiment of this embodiment, the first radio bearer comprises a DRB.

As a sub-embodiment of this embodiment, the first radio bearer comprises an MRB.

As a sub-embodiment of this embodiment, the first radio bearer comprises at least SRB1.

As one embodiment, the radio bearer for the network of the U2N remote UE connected to the first node uses the resources of the SCG.

As an embodiment, the radio bearer for the network of the U2N remote UE connected to the first node uses only the resources of the SCG.

As an embodiment, the radio bearer of the Uu interface of the U2N remote UE connected to the first node uses the resources of the SCG.

As an embodiment, the radio bearer of the Uu interface of the U2N remote UE connected to the first node uses only the resources of the SCG.

As an embodiment, the first node starts a first timer in response to performing the first signaling.

As a sub-embodiment of this embodiment, the first timer is T304.

As a sub-embodiment of this embodiment, the first timer is T404.

As a sub-embodiment of this embodiment, the first timer is T304a.

As a sub-embodiment of this embodiment, the first timer is T304b.

As a sub-embodiment of this embodiment, the first timer is T304r.

As a sub-embodiment of this embodiment, when the first signaling is performed immediately after being received, the act of starting the first timer in response to performing the first signaling is equivalent to starting the first timer in response to receiving the first signaling.

As a sub-embodiment of this embodiment, the act of starting the first timer includes starting and restarting.

As a sub-embodiment of this embodiment, the first timer is associated with a cell handover.

As a sub-embodiment of this embodiment, the first timer is associated with a path switch.

As a sub-embodiment of this embodiment, the first node starts the first timer when the first reconfiguration is applied.

As one example, the benefits of the above method include: when the relay UE uses the direct path and the indirect path at the same time, the data of the remote UE can be forwarded by using the direct path, so that the interruption of the data of the remote UE can be avoided, and multi-hop can be avoided.

As an embodiment, the first signaling is RRC signaling, the first signaling includes a first domain, the first domain includes a second domain, and the second domain is a reconfigurationwisync; the first domain is related to whether the first cell group is a master cell group or a slave cell group; the first cell group is a master cell group when the first domain is a masterCellGroup, and a slave cell group when the first domain is a secondaryccellgroup; the second field is used to indicate an expiration value of the first timer; expiration of the first timer is used to trigger RRC reestablishment.

As a sub-embodiment of this embodiment, the first reconfiguration is or includes the second domain.

As a sub-embodiment of this embodiment, the first reconfiguration belongs to the second domain.

As a sub-embodiment of this embodiment, the first field is used to indicate whether the first cell group is a master cell group or a cell group, when the first field is a masterCellGroup, the first cell group is a master cell group, and when the first field is a secondarycell group, the first cell group is a cell group.

As a sub-embodiment of this embodiment, the first cell group is the cell group indicated by the first domain.

As a sub-embodiment of this embodiment, when the first domain is a masterCellGroup, the first domain includes a configuration about a primary cell.

As a sub-embodiment of this embodiment, when the first domain is a second cell group, the first domain includes a configuration about a primary cell.

As a sub-embodiment of this embodiment, the first domain comprises a spCellConfig domain, and the spCellConfig comprises the second domain.

As a sub-embodiment of this embodiment, the second field comprises an expiration value of the first timer.

As a sub-embodiment of this embodiment, the candidate values for the second field including the expiration value of the first timer include 50ms,100ms,150ms,200ms,500ms,1000ms,2000ms,10000ms.

As a sub-embodiment of this embodiment, the act of starting the first timer comprises setting an expiration value of the first timer to the expiration value of the first timer indicated by the second domain.

As a sub-embodiment of this embodiment, the meaning of the expiration of the first timer used to trigger RRC reestablishment is or includes: expiration of the first timer will trigger the first node to perform RRC reestablishment.

As a sub-embodiment of this embodiment, the meaning of the expiration of the first timer used to trigger RRC reestablishment is or includes: the RRC reestablishment is equal to the connection reestablishment.

As a sub-embodiment of this embodiment, the meaning of the expiration of the first timer used to trigger RRC reestablishment is or includes: sufficient conditions for performing RRC reestablishment include expiration of the first timer.

As a sub-embodiment of this embodiment, the meaning of the expiration of the first timer used to trigger RRC reestablishment is or includes: the RRC reestablishment is an RRC procedure including at least transmitting an RRC reestablishment request message.

As a sub-embodiment of this embodiment, the meaning of the expiration of the first timer used to trigger RRC reestablishment is or includes: the RRC reestablishment is an RRC procedure including performing at least either one of cell selection and relay selection.

As a sub-embodiment of this embodiment, the meaning of the expiration of the first timer used to trigger RRC reestablishment is or includes: as part of the RRC reestablishment, the first cell group is suspended or released, the first cell group being SCG.

As an embodiment, the first node receives third signaling, the third signaling comprising the first signaling and a first set of execution conditions;

As a sub-embodiment of this embodiment, the first reconfiguration is a conditional reconfiguration.

As a sub-embodiment of this embodiment, the third signaling is an RRC message.

As a sub-embodiment of this embodiment, the third signaling is or includes an rrcrecon configuration message.

As a sub-embodiment of this embodiment, the third signaling comprises a conditional reconfiguration field, which comprises the first signaling.

As a sub-embodiment of this embodiment, the third signaling includes a conditional reconfiguration field, the conditional reconfiguration field included in the conditional reconfiguration field includes the first signaling, and the first signaling is rrcr reconfiguration.

As a sub-embodiment of this embodiment, the first signaling is the same name as the third signaling.

As a sub-embodiment of this embodiment, the first signaling is embedded in the third signaling by means of a container, i.e. the third signaling comprises a container comprising the first signaling in the form of a byte string.

As a sub-embodiment of this embodiment, the third signaling includes a configurable reconfiguration field including a condreconfiguratoaddmod field including the first signaling and the first set of execution conditions associated with the first signaling.

As a sub-embodiment of this embodiment, the first set of execution conditions includes at least one condition.

As a sub-embodiment of this embodiment, any one of the first set of execution conditions is satisfied triggering the behavior to execute the first signaling.

As a sub-embodiment of this embodiment, the first signaling is not performed immediately after being received.

As a sub-embodiment of this embodiment, the first signaling is received and stored in a state variable, and the first signaling is executed when at least one condition of the first set of execution conditions is satisfied.

As a sub-embodiment of this embodiment, the meaning of the sentence that at least one condition of the first set of execution conditions is fulfilled to trigger the behavior to execute the first signaling is: if one condition in the first execution condition set is met, executing the first signaling; and if no condition in the first execution condition set is met, not executing the first signaling.

As a sub-embodiment of this embodiment, the meaning of the sentence that at least one condition of the first set of execution conditions is fulfilled to trigger the behavior to execute the first signaling is: executing the first signaling if all conditions in the first set of execution conditions are satisfied; and if at least one condition in the first execution condition set is not met, not executing the first signaling.

As a sub-embodiment of this embodiment, the sentence said first set of execution conditions comprises: the meaning that the first measurement meets the first threshold is: one condition included in the first set of execution conditions is that the first measurement meets a first threshold.

As a sub-embodiment of this embodiment, the first measurement result comprises RSRP.

As a sub-embodiment of this embodiment, the first threshold is in dB.

As a sub-embodiment of this embodiment, the first threshold is in units of cm or m or km.

As a sub-embodiment of this embodiment, the first threshold is in units of ms or s or minutes or hours.

As a sub-embodiment of this embodiment, the first threshold is an absolute value.

As a sub-embodiment of this embodiment, the first threshold is a specific value.

As a sub-embodiment of this embodiment, the first threshold is a comparison value, i.e. another measurement.

As a sub-embodiment of this embodiment, the first threshold is a comparison value, i.e. an offset is added to the other measurement.

As a sub-embodiment of this embodiment, the first measurement result fulfils a first threshold value, meaning that the first measurement result is larger than the value indicated by the first threshold value.

As a sub-embodiment of this embodiment, the first measurement result meets the first threshold value in the sense that the first measurement result is not smaller than the value indicated by the first threshold value.

As a sub-embodiment of this embodiment, the first measurement result fulfils a first threshold value in the sense that the first measurement result is larger than another measurement result indicated by the first threshold value.

As a sub-embodiment of this embodiment, the first measurement satisfying the first threshold means that the first measurement is larger than the sum of a and B, where a is another measurement indicated by the first threshold and B is a given offset.

As a sub-embodiment of this embodiment, the first measurement satisfying the first threshold means that the first measurement is larger than a, where a is the sum of another measurement indicated by the first threshold and an offset.

As a sub-embodiment of this embodiment, the first measurement result fulfils the first threshold value in the sense that the first measurement result is not smaller than another measurement result indicated by the first threshold value.

As a sub-embodiment of this embodiment, the first measurement result fulfils a first threshold value, meaning that said first measurement result is not smaller than the sum of a and B, wherein a is another measurement result indicated by said first threshold value and B is a given offset.

As a sub-embodiment of this embodiment, the first measurement result meets the first threshold value in the sense that the first measurement result is not smaller than a, where a is the sum of another measurement result indicated by the first threshold value and an offset.

As a sub-embodiment of this embodiment, the first measurement is time and the first threshold is time.

As a sub-embodiment of this embodiment, the first measurement is distance or relative distance and the first threshold is distance.

As a sub-embodiment of this embodiment, the first measurement is a location and the first threshold is a specific location.

As a sub-embodiment of this embodiment, the first measurement result is a measurement result for a candidate cell.

As a sub-embodiment of this embodiment, the first measurement result is a measurement result for a candidate relay.

As an embodiment, the performing the first signaling is a configuration of applying the first signaling.

As an embodiment, all conditions in the first set of execution conditions are fulfilled to trigger execution of the first signaling.

As an embodiment, any one of the first set of execution conditions is satisfied and is used to trigger execution of the first signaling.

As an embodiment, the first signal is higher layer signaling.

As one embodiment, the first set of conditions includes determining to perform the first signaling.

Example 2

Embodiment 2 illustrates a schematic diagram of a network architecture according to the present application, as shown in fig. 2.

Fig. 2 illustrates a diagram of a network architecture 200 of a 5g nr, LTE (Long-Term Evolution) and LTE-a (Long-Term Evolution Advanced, enhanced Long-Term Evolution) system. The 5G NR or LTE network architecture 200 may be referred to as 5GS (5 GSystem)/EPS (Evolved Packet System ) 200, or some other suitable terminology. The 5GS/EPS 200 may include one or more UEs (User Equipment) 201, ng-RAN (next generation radio access network) 202,5GC (5G Core Network)/EPC (Evolved Packet Core, evolved packet core) 210, hss (Home Subscriber Server )/UDM (Unified Data Management, unified data management) 220, and internet service 230. The 5GS/EPS may interconnect with other access networks, but these entities/interfaces are not shown for simplicity. As shown, 5GS/EPS provides packet switched services, however, those skilled in the art will readily appreciate that the various concepts presented throughout this application may be extended to networks providing circuit switched services or other cellular networks. The NG-RAN includes NR node bs (gnbs) 203 and other gnbs 204. The gNB203 provides user and control plane protocol termination towards the UE 201. The gNB203 may be connected to other gnbs 204 via an Xn interface (e.g., backhaul). The gNB203 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), a TRP (transmit receive node), or some other suitable terminology. The gNB203 provides the UE201 with an access point to the 5GC/EPC210. Examples of UE201 include a cellular telephone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a Personal Digital Assistant (PDA), a satellite radio, a non-terrestrial base station communication, a satellite mobile communication, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, an drone, an aircraft, a narrowband internet of things device, a machine-type communication device, a land-based vehicle, an automobile, a wearable device, or any other similar functional device. Those of skill in the art may also refer to the UE201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. gNB203 is connected to 5GC/EPC210 through an S1/NG interface. The 5GC/EPC210 includes MME (Mobility Management Entity )/AMF (Authentication Management Field, authentication management domain)/SMF (Session Management Function ) 211, other MME/AMF/SMF214, S-GW (Service Gateway)/UPF (User Plane Function ) 212, and P-GW (Packet Date Network Gateway, packet data network Gateway)/UPF 213. The MME/AMF/SMF211 is a control node that handles signaling between the UE201 and the 5GC/EPC210. In general, the MME/AMF/SMF211 provides bearer and connection management. All user IP (Internet Protocal, internet protocol) packets are transported through the S-GW/UPF212, which S-GW/UPF212 itself is connected to the P-GW/UPF213. The P-GW provides UE IP address assignment as well as other functions. The P-GW/UPF213 is connected to the internet service 230. Internet services 230 include operator-corresponding internet protocol services, which may include, in particular, the internet, intranets, IMS (IP Multimedia Subsystem ) and packet-switched streaming services.

As an embodiment, the first node in the present application is UE201.

As an embodiment, the second node in the present application is UE241.

As one embodiment, the base station of the first node in the present application is the gNB203.

As an embodiment, the radio link from the UE201 to the UE241 is a sidelink.

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

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

As an embodiment, the UE201 supports relay transmission.

As an embodiment, the UE201 includes a mobile phone.

As one example, the UE201 is a vehicle including an automobile.

As an embodiment, the UE201 supports multiple SIM cards.

As an embodiment, the UE201 supports sidelink transmission.

As an embodiment, the UE201 supports MBS transmissions.

As an embodiment, the UE201 supports MBMS transmission.

As an embodiment, the UE241 supports relay transmission.

As an embodiment, the UE241 includes a mobile phone.

As one example, the UE241 is a vehicle including an automobile.

As one embodiment, the UE241 supports multiple SIM cards.

As an embodiment, the UE241 supports sidelink transmission.

As an embodiment, the UE241 supports MBS transmissions.

As an embodiment, the UE241 supports MBMS transmission.

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

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

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

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

As one embodiment, the gNB203 is a satellite device.

Example 3

Embodiment 3 shows a schematic diagram of an embodiment of a radio protocol architecture according to one user plane and control plane of the present application, as shown in fig. 3. Fig. 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, fig. 3 shows the radio protocol architecture for the control plane 300 for a first node (UE, satellite or aerial in gNB or NTN) and a second node (gNB, satellite or aerial in UE or NTN), or between 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 links between the first node and the second node and the two UEs through PHY301. The L2 layer 305 includes a MAC (Medium Access Control ) sublayer 302, an RLC (Radio Link Control, radio link layer control protocol) sublayer 303, and a PDCP (Packet Data Convergence Protocol ) sublayer 304, which terminate at the second node. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security by ciphering the data packets and handover support for the first node between second nodes. The RLC sublayer 303 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data 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 among the first nodes. The MAC sublayer 302 is also responsible for HARQ operations. The 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 the 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, PDCP sublayer 354 in the L2 layer 355, RLC sublayer 353 in the L2 layer 355 and MAC sublayer 352 in the L2 layer 355 as the corresponding layers and sublayers in the control plane 300, but the PDCP sublayer 354 also provides header compression for upper layer packets to reduce radio transmission overhead. Also included in the L2 layer 355 in the user plane 350 is an SDAP (Service Data Adaptation Protocol ) sublayer 356, the SDAP sublayer 356 being responsible for mapping between QoS flows and data radio bearers (DRBs, data Radio Bearer) to support diversity of traffic. Although not shown, the first node may have several upper layers above the L2 layer 355. Further included are a network layer (e.g., IP layer) terminating at the P-GW on the network side and an application layer terminating at the other end of the connection (e.g., remote UE, server, etc.). For UEs involving relay services, its control plane may also include an adaptation sublayer SRAP (Sidelink Relay Adaptation Protocol, sidelink relay adaptation may be possible) 308, and its user plane may also include an adaptation sublayer SRAP358, the introduction of which may facilitate multiplexing and/or distinguishing data from multiple source UEs by lower layers, such as the MAC layer, e.g., the RLC layer.

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

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

As an embodiment, the first signaling in the present application is generated in RRC306 or MAC302.

As an embodiment, the second signaling in the present application is generated in PHY301 or MAC302.

As an embodiment, the third signaling in the present application is generated in RRC306.

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

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

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

As an embodiment, the fourth signal in the present application is generated in RRC306 or MAC302 or PHY301 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 communication device 450 includes a controller/processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, and optionally a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter/receiver 454, and an antenna 452.

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

In the transmission from the second communication device 410 to the first communication device 450, upper layer data packets from the core network are provided to a controller/processor 475 at the second communication device 410. The controller/processor 475 implements the functionality of the L2 (Layer-2) Layer. In the transmission from the second communication device 410 to the first communication device 450, a controller/processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 450 based on various priority metrics. The controller/processor 475 is also responsible for retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., physical layer). Transmit processor 416 performs coding and interleaving to facilitate Forward Error Correction (FEC) at the second communication device 410, as well as mapping of signal clusters based on various modulation schemes, e.g., binary Phase Shift Keying (BPSK), quadrature Phase Shift Keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM). The multi-antenna transmit processor 471 digitally space-precodes the coded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. A transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes with reference signals (e.g., pilots) in the time and/or frequency domain, and then uses an Inverse Fast Fourier Transform (IFFT) to generate a physical channel carrying the time domain multicarrier symbol stream. The multi-antenna transmit processor 471 then performs transmit analog precoding/beamforming operations on the time domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multicarrier symbol stream provided by the multiple antenna transmit processor 471 to a radio frequency stream and then provides it to a different antenna 420.

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

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

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

As an embodiment, the first communication device 450 apparatus includes: receiving first signaling, performing the first signaling, the first signaling being used to indicate a first reconfiguration for a first group of cells; determining whether to transmit a first signal on a sidelink based on whether all conditions in a first set of conditions are met and whether the first cell group is a master cell group or a slave cell group; wherein the first reconfiguration includes at least one of a cell handover and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; one condition of the first set of conditions includes: at least one U2N remote UE is connected with the first node; the sentence is based on whether all conditions in the first set of conditions are met and whether the first cell group is a master cell group or a slave cell group, the meaning of determining whether to send the first signal on the sidelink is: transmitting a first signal when all conditions in the first set of conditions are satisfied and the first cell group is a primary cell group; when the first cell group is a cell group or at least one condition of the first set of conditions is not satisfied, no first signal is sent.

As an embodiment, the first communication device 450 includes: a memory storing a program of computer-readable instructions that, when executed by at least one processor, produce acts comprising: receiving first signaling, performing the first signaling, the first signaling being used to indicate a first reconfiguration for a first group of cells; determining whether to transmit a first signal on a sidelink based on whether all conditions in a first set of conditions are met and whether the first cell group is a master cell group or a slave cell group; wherein the first reconfiguration includes at least one of a cell handover and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; one condition of the first set of conditions includes: at least one U2N remote UE is connected with the first node; the sentence is based on whether all conditions in the first set of conditions are met and whether the first cell group is a master cell group or a slave cell group, the meaning of determining whether to send the first signal on the sidelink is: transmitting a first signal when all conditions in the first set of conditions are satisfied and the first cell group is a primary cell group; when the first cell group is a cell group or at least one condition of the first set of conditions is not satisfied, no first signal is sent.

As an embodiment, the second communication device 410 apparatus includes: at least one processor and at least one memory including computer program code; the at least one memory and the computer program code are configured for use with the at least one processor. The second communication device 410 means at least: receiving a first signal on a sidelink; performing a first operation according to an RRC state in response to receiving the first signal; wherein a sender of the first signal receives first signaling in a main link and performs the first signaling; the first signaling is used to indicate a first reconfiguration for a first group of cells; the first cell group is a master cell group; the first reconfiguration includes at least one of a cell switch and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; the second node is a U2N remote UE connected to a sender of the first signal; the meaning of the sentence performing the first operation according to the RRC state is: the first operation is connection reestablishment when the second node is in an RRC connected state; the first operation is relay reselection when the second node is in an RRC idle state or an RRC inactive state; the RRC state of the second node is one of an RRC connected state, an RRC idle state, and an RRC inactive state.

As an embodiment, the second communication device 410 apparatus includes: a memory storing a program of computer-readable instructions that, when executed by at least one processor, produce acts comprising: receiving a first signal on a sidelink; performing a first operation according to an RRC state in response to receiving the first signal; wherein a sender of the first signal receives first signaling in a main link and performs the first signaling; the first signaling is used to indicate a first reconfiguration for a first group of cells; the first cell group is a master cell group; the first reconfiguration includes at least one of a cell switch and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; the second node is a U2N remote UE connected to a sender of the first signal; the meaning of the sentence performing the first operation according to the RRC state is: the first operation is connection reestablishment when the second node is in an RRC connected state; the first operation is relay reselection when the second node is in an RRC idle state or an RRC inactive state; the RRC state of the second node is one of an RRC connected state, an RRC idle state, and an RRC inactive state.

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

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

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

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

As an embodiment, the second communication device 450 is a relay.

As an example, the second communication device 450 is a satellite.

As an example, the second communication device 450 is an aircraft.

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

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

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

As an example, the second communication device 410 is a satellite.

As an example, the second communication device 410 is an aircraft.

As an example, a receiver 454 (including an antenna 452), a receive processor 456 and a controller/processor 459 are used for receiving the first signaling in the present application.

As an example, a receiver 454 (including an antenna 452), a receive processor 456 and a controller/processor 459 are used for receiving said second signaling in the present application.

As an example, a receiver 454 (comprising an antenna 452), a receive processor 456 and a controller/processor 459 are used for receiving said third signaling in the present application.

As one example, a transmitter 454 (including an antenna 452), a transmit processor 468 and a controller/processor 459 are used to transmit the first signal in this application.

As one example, a transmitter 454 (including an antenna 452), a transmit processor 468 and a controller/processor 459 are used to transmit the second signal in this application.

As one example, a transmitter 454 (including an antenna 452), a transmit processor 468 and a controller/processor 459 are used to transmit the third signal in this application.

As one example, a transmitter 454 (including an antenna 452), a transmit processor 468 and a controller/processor 459 are used to transmit the fourth signal in this application.

As an example, receiver 418 (including antenna 420), receive processor 470 and controller/processor 475 are used to receive the first signal in the present application.

As an example, receiver 418 (including antenna 420), receive processor 470 and controller/processor 475 are used to receive the second signal in the present application.

As an example, receiver 418 (including antenna 420), receive processor 470 and controller/processor 475 are used to receive the third signal in the present application.

As an example, receiver 418 (including antenna 420), receive processor 470 and controller/processor 475 are used to receive the fourth signal in the present application.

Example 5

Embodiment 5 illustrates a wireless signal transmission flow diagram according to one 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 it is specifically stated that the order in this example is not limited to the order of signal transmission and implementation in the present application, where steps within F51 and F52 are optional.

For the followingFirst node U01Receiving a first signaling in step S5101; receiving a second signaling in step S5102; transmitting a first signal in step S5103; in step S5104, a radio link failure of the second radio link is detected; transmitting a fourth signal in step S5105; in step S5106, it is detected that a radio link failure occurs in the first radio link; in step S5107, it is determined whether the first radio link is a radio link between the first node and the primary cell group; a third signal is sent in step S5108.

For the followingSecond node U02Receiving a first signal in step S5201; receiving a fourth signal in step S5202; the third signal is received in step S5203.

For the followingThird node U03Transmitting a first signaling in step S5301; the second signaling is sent in step S5302.

In embodiment 5, the first signaling is used to indicate a first reconfiguration for a first group of cells; the first node U01 determining whether to send a first signal on a sidelink based on whether all conditions in a first set of conditions are met and whether the first cell group is a master cell group or a slave cell group;

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 an NR ProSe U2N relay UE.

As an embodiment, the second node U02 is a U2N remote UE.

As an embodiment, the wireless link between the first node U01 and the second node U02 is a sidelink wireless link.

As an embodiment, the wireless link between the first node U01 and the third node U03 is a main link wireless link.

As an embodiment, the second node U02 is a U2N remote UE connected to the first node U01.

As an embodiment, the third node U03 is a base station.

As an embodiment, the third node U03 is the first cell group.

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

As an embodiment, the third node U03 is a gNB corresponding to the first cell group.

As an embodiment, the third node U03 is a primary cell of the first node U01.

As an embodiment, the third node U03 is a master cell group of the first node U01.

As an embodiment, the third node U03 corresponds to the first cell group or the base station corresponding to the first cell group in the present application.

As an embodiment, the first signaling is RRC signaling.

As one embodiment, the first signaling includes SIB12.

As an embodiment, the first signaling comprises rrcrecon configuration.

As an embodiment, the first signaling includes ReconfigurationWithSync.

As an embodiment, the first signaling includes cellgroupconfig.

As an embodiment, the first signaling includes masterCellGroup.

As an embodiment, the first signaling includes a second signaling group.

As an embodiment, the first signaling is sent to the first node U01 via SRB 1.

As an embodiment, the first signaling is part of a third signaling indicating whether the first signaling is performed immediately after receiving the first signaling.

As an embodiment, the first signaling is an rrcrecon configuration message, and the first signaling is a separate RRC message, i.e. not part of other RRC messages, and the first signaling is performed immediately after receiving the first signaling.

As an embodiment, the first signaling is rrcrecon configuration, and the first signaling is not a separate RRC message, i.e. is part of another RRC message, and is not performed immediately after receiving the first signaling.

As a sub-embodiment of this embodiment, the first signaling belongs to the third signaling.

As a sub-embodiment of this embodiment, the first signaling is performed when a first set of execution conditions associated with the first signaling is satisfied.

As an embodiment, the second signaling is control signaling below the RRC layer, the second signaling being used to trigger the action to perform the first signaling.

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

As a sub-embodiment of this embodiment, the second signaling is DCI.

As a sub-embodiment of this embodiment, the second signaling is transmitted over the Uu interface.

As a sub-embodiment of this embodiment, the second signaling is not an RRC message.

As a sub-embodiment of this embodiment, the second signaling indicates an index or identity of the first signaling.

As a sub-embodiment of this embodiment, the meaning that the sentence said second signaling is used to trigger said behavior to perform said first signaling is or comprises: the second signaling explicitly indicates that the first signaling is performed, and the first signaling is not performed immediately after being received.

As a sub-embodiment of this embodiment, the meaning that the sentence said second signaling is used to trigger said behavior to perform said first signaling is or comprises: the second signaling indicates the index or the identity of the first signaling, and after receiving the second signaling, the first node U01 executes the corresponding signaling according to the index or the identity indicated by the second signaling, and in this embodiment, executes the first signaling.

As a sub-embodiment of this embodiment, the meaning that the sentence said second signaling is used to trigger said behavior to perform said first signaling is or comprises: the second signaling is a trigger condition for performing the first signaling.

As a sub-embodiment of this embodiment, the meaning that the sentence said second signaling is used to trigger said behavior to perform said first signaling is or comprises: after receiving the second signaling, the first node U01 executes the first signaling; when the second signaling is not received, the first node U01 does not perform the first signaling.

As a sub-embodiment of this embodiment, the first signaling is stored in one state variable after being received, and the first signaling is deleted from the one state variable after being executed.

As a sub-embodiment of this embodiment, the second signaling comprises a target cell identity and the first signaling also comprises the target cell identity.

As a sub-embodiment of this embodiment, the second signaling includes an identity of a target node, the first signaling also includes an identity of the target node, and after receiving the second signaling, the first node U01 performs signaling for the target node, which is in this embodiment the first signaling, where the target node is one of a target cell, a target primary cell group, a target cell, a target secondary cell group, a target PSCell, and a target L2U 2N relay UE.

As an embodiment, the first signal is sent when the first node U01 determines that the first signaling is to be performed.

As an embodiment, the transmission of the first signal is part of performing the first signaling.

As an embodiment, the sending of the first signal is performed after the performing of the first signaling by the act is completed.

As an embodiment, the first node U01 detects in step S5104 that a radio link failure occurs in a second radio link (Radio link failure), which is a radio link between the first node and a fourth node; the fourth node is a remote UE.

As a sub-embodiment of this embodiment, the fourth node is a U2N remote UE connected to the first node U01.

As a sub-embodiment of this embodiment, the first node U01 is a relay between the second node U02 and the fourth node.

As a sub-embodiment of this embodiment, the first node U01 is a U2U relay that communicates between the second node U02 and the fourth node.

As a sub-embodiment of this embodiment, the second wireless link is a sidelink wireless link between the first node and a fourth node.

As a sub-embodiment of this embodiment, the first node U01 communicates with the second node U02 via a sidelink, and the first node U01 communicates with the fourth node via a sidelink.

As a sub-embodiment of this embodiment, the first node U01 detects the second radio link failure by HARQ retransmission to the maximum number.

As a sub-embodiment of this embodiment, the first node U01 detects the second radio link failure by the physical layer measurement result being below a certain threshold.

As a sub-embodiment of this embodiment, the first node U01 detects the second radio link failure by discovering that a T400 timer expires.

As an embodiment, the first node U01 sends the fourth signal in response to detecting that the second radio link has failed.

As an embodiment, the fourth signal comprises a first SCI (sidelink control information) and a first MAC PDU, the first SCI comprising N bits of the identity of the second node U02 and a header of the first MAC PDU comprising bits other than the N bits of the identity of the second node U02; n is a positive integer.

As a sub-embodiment of this embodiment, the first SCI is generated at the physical layer, the first SCI indicating the resources occupied by the first MAC PDU.

As a sub-embodiment of this embodiment, the identity of the second node U02 is a link layer identity.

As a sub-embodiment of this embodiment, the identity of the second node U02 is L2 ID or Layer-2 ID.

As a sub-embodiment of this embodiment, the identity of the second node U02 comprises 24 bits.

As a sub-embodiment of this embodiment, said N is equal to 8, said first SCI comprises 8 least significant bits of said identity of said second node U02, and the header of said first MAC PDU comprises 16 most significant bits of said identity of said second node U02.

As a sub-embodiment of this embodiment, said N is equal to 16, said first SCI comprises 16 least significant bits of said identity of said second node U02, and said header of said first MAC PDU comprises 8 most significant bits of said identity of said second node U02.

As an embodiment, the fourth signal is sent on a sidelink.

As an embodiment, the fourth signal comprises a PC5 RRC message.

As an embodiment, the fourth signal comprises a PC5-S message.

As an embodiment, the fourth signal includes a notifiationessagesidelink message.

As an embodiment, the reason why the fourth signal is transmitted is that the radio link failure occurs, which is indicated by the indifferentype field included in the fourth signal.

As an embodiment, the value of the indifferentype field included in the fourth signal is set to a relay ue-RLF to indicate that the reason for sending the fourth signal is that a radio link failure occurs.

As an embodiment, the value of the indifferentype field included in the fourth signal is set to a value of the relay ue-PC5RLF to indicate that the reason for sending the fourth signal is that a radio link failure occurs.

As an embodiment, the value of the indifferentype field included in the fourth signal is set to be related ue-SLRLF to indicate that the reason for sending the fourth signal is that radio link failure occurs.

As an embodiment, the first node U01 detects that the first radio link fails in step S5106.

As a sub-embodiment of this embodiment, the first node U01 detects the radio link failure occurring on the first radio link by expiration of at least one of a T310 timer or a T312 timer.

As a sub-embodiment of this embodiment, the first node U01 detects the radio link failure occurring in the first radio link by an indication of an error occurrence in the MAC layer.

As a sub-embodiment of this embodiment, the first node U01 detects the radio link failure occurring in the first radio link by finding that the RLC layer reaches the maximum number of retransmissions.

As a sub-embodiment of this embodiment, the first radio link is a radio link between the first node U01 and the first cell group.

As a sub-embodiment of this embodiment, the first radio link is a radio link between the first node U01 and a set of primary cells.

As a sub-embodiment of this embodiment, the first radio link is a radio link between the first node U01 and a cell group.

As a sub-embodiment of this embodiment, the first wireless link is different from the second wireless link.

As an embodiment, the first node U01 sends the second signal in response to detecting that the first radio link has failed.

As an embodiment, the third number is or includes higher layer signaling.

As an embodiment, the third signal comprises a PC5 RRC message.

As an embodiment, the third signal comprises a PC5-S message.

As an embodiment, the third signal includes a notifiationessagesidelink message.

As an embodiment, the reason why the fourth signal is transmitted is indicated by the indifferentype field included in the third signal is that a radio link failure occurs.

As an embodiment, the reason why the indication type field included in the third signal indicates that the fourth signal is sent is that radio link failure of the Uu interface occurs.

As an embodiment, the reason why the indication type field included in the third signal indicates that the fourth signal is sent is that the first radio link fails in radio link.

As an embodiment, the value of the indifferentype field included in the third signal is set to be a delayue-UuRLF to indicate that the reason for sending the fourth signal is that a radio link failure occurs.

As an embodiment, the reason why the indication type field included in the third signal indicates that the fourth signal is sent is that the first radio link fails, and the first radio link is a radio link between the first node U01 and the MCG.

As one embodiment, if the first radio link is not a radio link between the first node U01 and a master cell group, the first radio link is a radio link between the first node U01 and a cell group.

As an embodiment, the third signal is sent on a sidelink.

As an embodiment, the first signal, the second signal, the third signal, and the fourth signal are transmitted two by two at different times.

As an embodiment, the fourth signal may be transmitted simultaneously with the first signal, the second signal or the third signal; and the first signal, the second signal and the third signal are transmitted in a pairwise manner at different time.

As one embodiment, the first node U01 does not send the third signal when the first wireless link is not a wireless link between the first node U01 and a master cell group.

Example 6

Embodiment 6 illustrates a wireless signal transmission flow diagram according to one embodiment of the present application, as shown in fig. 6. In fig. 6, U11 corresponds to a first node of the present application, and U12 corresponds to a second node of the present application, which specifically illustrates that the order in this example does not limit the order of signal transmission and implementation in the present application. Example 6 is based on example 5, and reference is made to example 5 for the parts of example 6 that are required but not illustrated.

For the followingFirst node U11Cell reselection is performed in step S6101; determining in step S6102 whether the second condition is satisfied; the second signal is transmitted in step S6103.

For the followingSecond node U12The second signal is received in step S6201.

As an embodiment, the first node U11 is a U2N relay UE.

As an embodiment, the first node U11 is a U2N remote UE.

As an embodiment, the first node U11 is an NR ProSe U2N remote UE.

As an embodiment, the second node U12 is a U2N remote UE.

As an embodiment, the first node U11 provides a U2N relay service for the second node U12.

As an embodiment, the first node U11 transitions from the RRC connected state to the non-RRC connected state before step S6101.

As an embodiment, the non-RRC connected state includes an RRC idle state.

As an embodiment, the non-RRC connected state includes an RRC inactive state.

As an embodiment, the first node U11 enters the RRC connected state after completing step S6102.

As an embodiment, the first node U11 enters the RRC connected state after completing step S6103.

As an embodiment, the cell selected by the first node U11 to perform cell reselection in step S6101 is the first cell.

As an embodiment, the cell in which the first node U11 resides before performing the cell reselection in step S6101 is a second cell.

As a sub-embodiment of this embodiment, in step S6101, the first node U11 reselects from the second cell to the first cell.

As a sub-embodiment of this embodiment, the first cell is different from the second cell.

As a sub-embodiment of this embodiment, the first node U11 determines, from the cell identity of the first cell, the gNB to which the first cell belongs.

As a sub-embodiment of this embodiment, the first node U11 determines, from the cell identity of the second cell, the gNB to which the first cell belongs.

As an embodiment, the first node U11 determines whether to transmit a second signal on a sidelink according to whether the second condition is satisfied, and transmits the second signal when the second condition is satisfied; when the second condition is not satisfied, a second signal is not transmitted.

As an embodiment, the second condition is that the gNB to which the first cell belongs is different from the gNB to which the second cell belongs, and the second condition is satisfied, that is, the gNB to which the first cell belongs is different from the gNB to which the second cell belongs.

As one embodiment, the first node U11 determines whether to send the second signal on the sidelink according to the gNB to which the first cell belongs, and sends the second signal when the gNB to which the first cell belongs is different from the gNB to which the second cell belongs; and when the gNB to which the first cell belongs is the same as the gNB to which the second cell belongs, not transmitting a second signal.

As an embodiment, the gcb to which the first cell belongs is the same as the gcb to which the second cell belongs, meaning that the first cell and the second cell are managed by the same gcb or belong to the same gcb.

As an embodiment, the gNB to which the first cell belongs is the same as the gNB to which the second cell belongs, meaning that the first cell and the second cell have the same CU.

As an embodiment, the gNB to which the first cell belongs is the same as the gNB to which the second cell belongs, meaning that the first cell and the second cell have the same DU.

As an embodiment, the second signal is sent on a sidelink.

As an embodiment, the second signal comprises a PC5 RRC message.

As an embodiment, the second signal comprises a PC5-S message.

As an embodiment, the second signal includes a notifiationessagesidelink message.

As an embodiment, the reason why the fourth signal is transmitted is indicated by the indifferentype field included in the second signal is that a cell reselection occurs.

As an embodiment, the reason why the second signal includes an indifferentype field indicating that the fourth signal is transmitted is that cell reselection between gnbs occurs.

As an embodiment, the above method has the advantage that, although the first node performs cell reselection, since the new cell and the original cell belong to the same gNB, excessive signaling processing is not involved, and therefore, a notification message may not be sent to the U2N remote UE, so as to avoid interruption of the U2N remote UE.

As an embodiment, the second condition is that the second cell and the first cell belong to different system information areas.

As a sub-embodiment of this embodiment, the second condition is fulfilled, meaning that the first cell and the second cell belong to different system information areas.

As a sub-embodiment of this embodiment, a systemInformationAreaID indicated by a system message of the first cell is used to identify a system information area to which the first cell belongs; the systemInformationAreaID indicated by the system message of the second cell is used to identify a system information area to which the second cell belongs.

As an embodiment, the second condition is that the second cell and the first cell belong to different tracking areas.

As a sub-embodiment of this embodiment, the second condition is fulfilled, meaning that the first cell and the second cell belong to different tracking areas.

As a sub-embodiment of this embodiment, a tracking area code (tracking area code) indicated by the system message of the first cell is used to identify the tracking area to which the first cell belongs; and the tracking area code indicated by the system message of the second cell is used for identifying the tracking area to which the second cell belongs.

As an embodiment, the second condition is that the second cell and the first cell belong to different RAN notification areas.

As a sub-embodiment of this embodiment, the second condition is fulfilled, meaning that the first cell and the second cell belong to different RAN (radio access network ) notification areas.

As a sub-embodiment of this embodiment, the RAN-area code included in the system message of the first cell is used to indicate the RAN notification area to which the first cell belongs; and the RAN-area code included in the system message of the second cell is used for indicating the RAN notification area to which the second cell belongs.

As one embodiment, the first condition includes a first sub-condition, a second sub-condition, a third sub-condition, and a fourth sub-condition, and the first condition is satisfied when all sub-conditions included in the first condition are satisfied.

As one embodiment, the first condition includes a first sub-condition, a second sub-condition, a third sub-condition, and a fourth sub-condition, and the first condition is satisfied when at least two sub-conditions included in the first condition are satisfied.

As a sub-embodiment of this embodiment, the at least two sub-conditions are one of the first and second sub-conditions, the first and fourth sub-conditions, the second and third sub-conditions, the second and fourth sub-conditions, and the third and fourth sub-conditions.

As one embodiment, the first condition includes a first sub-condition, a second sub-condition, a third sub-condition, and a fourth sub-condition, and the first condition is satisfied when at least three sub-conditions included in the first condition are satisfied.

As a sub-embodiment of this embodiment, the at least three sub-conditions are one of the first and second sub-conditions and third sub-conditions, the fourth and second sub-conditions and third sub-conditions, and the first and fourth sub-conditions.

As an embodiment, the first sub-condition is that the gNB to which the first cell belongs is different from the gNB to which the second cell belongs.

As an embodiment, the second sub-condition is that the second cell and the first cell belong to different system information areas.

As an embodiment, the third sub-condition is that the second cell and the first cell belong to different tracking areas.

As an embodiment, the fourth sub-condition is that the second cell and the first cell belong to different RAN notification areas.

As an embodiment, the RAN notification area is configured to determine whether a UE in an RRC inactive state initiates a RAN area update, where the UE in an RRC inactive state does not need to initiate a RAN area update when moving in a different cell in the same RAN notification area; a UE in an RRC inactive state needs to initiate a RAN area update when moving between different RAN announcement areas.

Example 7

Embodiment 7 illustrates a schematic diagram of a protocol stack for relaying communications according to one embodiment of the present application, as shown in fig. 7.

FIG. 7 shows two sub-graphs (a) and (b).

The protocol stack shown in fig. 7 is applicable to L2U 2N relay communication, and embodiment 7 is based on embodiment 3.

Fig. 7 (a) corresponds to a user plane protocol stack in L2U 2N relay communication; fig. 7 (b) corresponds to a control plane protocol stack in L2U 2N relay communication.

As an example, the first node in fig. 7 is a relay of the second node when using an indirect path.

As an embodiment, the first node in fig. 7 is an L2U 2N relay UE between the second node and the first cell group.

As an embodiment, the gNB in fig. 7 is the gNB in the first cell group.

As an embodiment, the gNB in fig. 7 is the gNB corresponding to the first cell group.

As an embodiment, the gNB in fig. 7 is a gNB corresponding to the PCell of the first cell group.

As an embodiment, the gNB in fig. 7 belongs to the first cell group.

In embodiment 7, the PC5 interface is an interface between the second node and the first node, and the PC5 interface-related protocol entity { PC5-SRAP, PC5-RLC, PC5-MAC, PC5-PHY } terminates at the first node and the second node; the Uu interface is an interface between the UE and the gNB, and protocol entities of the Uu interface are respectively terminated by the UE and the gNB.

As an embodiment, the first node is a U2N relay UE, and the first node provides an L2U 2N relay service to the second node before performing the first signaling.

As an embodiment, the first node is a U2N relay UE, and the first node provides an L2U relay service to the second node before performing the first signaling.

As an embodiment, both the first node and the second node are UEs.

As an embodiment, the gNB in fig. 7 corresponds to the third node in embodiment 5 of the present application.

As an embodiment, the protocol entities { Uu-SRAP, uu-RLC, uu-MAC, uu-PHY } of the Uu interface terminate at the first node and the gNB.

As an embodiment, in (a), the protocol entity { Uu-SDAP, uu-PDCP } of the Uu interface ends with the second node and the gNB, and the SDAP PDU and PDCP PDU of the second node are forwarded by the first node, but the first node does not modify the SDAP PDU and PDCP PDU of the second node, that is, the SDAP PDU and PDCP PDU sent by the second node to the gNB are transparent to the first node.

As an embodiment, in (b), the protocol entity { Uu-RRC, uu-PDCP } of the Uu interface ends with the second node and the gNB, and RRC PDUs and PDCP PDUs of the second node are forwarded by the first node, but the first node does not modify the RRC PDUs and PDCP PDUs sent by the second node, that is, the RRC PDUs and PDCP PDUs sent by the second node to the gNB are transparent to the first node.

As an example, in (a), PC5-SRAP corresponds to SRAP357 in fig. 3, PC5-RLC corresponds to RLC353 in fig. 3, PC5-MAC corresponds to MAC352 in fig. 3, and PC5-PHY corresponds to PHY351 in fig. 3.

As an example, in (a), uu-SDAP corresponds to SDAP356 in fig. 3, uu-PDCP corresponds to PDCP354 in fig. 3.

As an example, in (b), PC5-SRAP corresponds to SRAP307 in fig. 3, PC5-RLC corresponds to RLC303 in fig. 3, PC5-MAC corresponds to MAC302 in fig. 3, and PC5-PHY corresponds to PHY301 in fig. 3.

As an example, in (b), uu-RRC corresponds to RRC306 in fig. 3 and Uu-PDCP corresponds to PDCP304 in fig. 3.

As an example, one cell of the gNB shown in fig. 7 is the PCell of the first node, and the first node is in an RRC connected state.

As one embodiment, the first node communicates with the gNB via a direct path.

As an embodiment, the first cell group is the MCG of the first node.

As an embodiment, the first cell group is an SCG of the first node.

As an example, PC5-SRAP is used only for specific RBs or messages or data.

As a sub-embodiment of this embodiment, the PC5-SRAP layer is not used when the first node forwards the system information of the gNB.

As an example, in fig. 7, the communication between the second node and the gNB uses an indirect path.

As an example, in fig. 7, the communication between the first node and the gNB uses a direct path.

As an embodiment, the first signaling is generated by Uu-RRC of the gNB in fig. 7 (b), which is received by Uu-RRC of the first node.

As an embodiment, the first signal, the second signal, the third signal, and the fourth signal are all transmitted over a PC5 interface between the first node and the second node.

As an embodiment, the Uu-PDCP of the second node is associated with PC5-RLC, or with PC5-RLC via PC5-SRAP, when using an indirect path.

As an embodiment, when using the direct path, the second node will establish Uu-RLC, with which Uu-PDCP of the second node is associated.

As an embodiment, when the first node performs cell reselection, the first node is in an RRC idle state or an RRC inactive state.

Example 8

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

The topology of example 8 and the meaning of direct and indirect paths apply to other examples including example 5.

The first node in embodiment 8 corresponds to the first node of the present application, and the second node corresponds to the second node of the present application.

In embodiment 8, the second node communicates with the network through the relay service of the first node.

As an embodiment, the third node in embodiment 8 corresponds to the first cell group of the present application.

As an embodiment, the third node in embodiment 8 corresponds to the primary cell of the first cell group of the present application.

As an embodiment, the third node in embodiment 8 corresponds to the gNB corresponding to the first cell group in the present application.

As an embodiment, the third node in embodiment 8 corresponds to the PCell of the first node of the present application.

As an embodiment, the third node in embodiment 8 corresponds to one transmitting point of the primary cell group of the first node in the present application.

As an embodiment, the first node in embodiment 8 is an L2U 2N relay UE of the second node.

As an embodiment, the third node in embodiment 8 is one SCell of the first cell group.

As an embodiment, the third node in embodiment 8 is a transmitting point of the first cell group.

As an example, the third node in example 8 is a cell other than a PCell.

As one embodiment, the third node in embodiment 8 is a master cell group.

As one embodiment, the third node in embodiment 8 is a cell group.

As an embodiment, the third node in embodiment 8 is a neighbor cell.

As an embodiment, the third node in embodiment 8 is a repeater of the first cell group.

As an example, the third node in example 8 is one node of a TN.

As an embodiment, the third node in embodiment 8 is a node of NTN.

As one example, the second node in example 8 communicates with the network using an indirect path.

As a sub-embodiment of this embodiment, the indirect path used by the second node comprises a sidelink radio link r1 between the second node and the first node.

As a sub-embodiment of this embodiment, the indirect path used by the second node comprises a wireless link b1 between the third node and the first node.

As a sub-embodiment of this embodiment, the indirect path used by the second node comprises a sidelink RLC bearer between the second node and the first node for transmitting data between the second node and the third node.

As a sub-embodiment of this embodiment, the indirect path used by the second node comprises an RLC bearer between the third node and the first node for transmitting data between the second node and the third node.

As a sub-embodiment of this embodiment, the indirect path used by the second node includes a radio bearer forwarded by the first node between the second node and the third node.

As an embodiment, the first node communicates with the third node via a direct path.

As a sub-embodiment of this embodiment, the direct path used by the first node comprises a wireless link b1 between the first node and the third node.

As a sub-embodiment of this embodiment, the direct path used by the first node comprises RLC bearers and/or radio bearers between the first node to the third node.

As an embodiment, the first node communicates with the fifth node via a direct path.

As a sub-embodiment of this embodiment, the direct path used by the first node comprises a wireless link b2 between the first node and the fifth node.

As a sub-embodiment of this embodiment, the direct path used by the first node comprises RLC bearers and/or radio bearers between the first node to the fifth node.

As an embodiment, the fifth node is a master cell group of the first node.

As an embodiment, the fifth node is a cell group of the first node.

As an embodiment, one of the third node and the fifth node is a master cell group of the first node, and the other is a cell group of the first node.

As an embodiment, the first node communicates with the third node and the fifth node simultaneously using a dual connectivity (dual connectivity, DC) technology.

As an embodiment, the first cell group is the fifth node.

As an embodiment, the first cell group is the third node.

As an embodiment, the third node is a master cell group of the first node, and the fifth node is a cell group of the first node.

As a sub-embodiment of this embodiment, when the first cell group is the third node, the first node transmits the first signal; when the first cell group is the fifth node, the first node does not transmit the first signal.

As a sub-embodiment of this embodiment, when the first cell group is the third node, the first node transmits the first signal; and when the first cell group is the fifth node, the first node does not send a Notification nMessageSidelink message.

As a sub-embodiment of this embodiment, the first cell group is the third node, and the first reconfiguration is for indicating a handover from the third node to a destination cell, which is a new PCell.

As a sub-embodiment of this embodiment, the first cell group is the third node, and the first reconfiguration is for indicating a handover from the third node to a destination cell group, which is a new MCG.

As a sub-embodiment of this embodiment, the first cell group is the third node, and the first reconfiguration is to indicate to communicate with the third node via an indirect path.

As a sub-embodiment of this embodiment, the first cell group is the fifth node, and the first reconfiguration is for indicating a handover from the fifth node to a destination cell, the destination cell being a new PSCell.

As a sub-embodiment of this embodiment, the first cell group is the fifth node, and the first reconfiguration is for indicating a switch from the fifth node to a destination cell group, the destination cell group being a new SCG.

As a sub-embodiment of this embodiment, the first cell group is the fifth node, and the first reconfiguration is to indicate to communicate with the fifth node via an indirect path.

As a sub-embodiment of this embodiment, when a radio link failure occurs in the radio link b1 between the first node and the third node, the first node transmits a third signal; when a radio link b2 between the first node and the fifth node fails, the first node does not send a third signal.

As a sub-embodiment of this embodiment, when a radio link failure occurs in the radio link b1 between the first node and the third node, the first node sends a notifiation essagesidelink message; when the radio link b2 between the first node and the fifth node fails, the first node does not send a notificationessagesidelink message.

As an embodiment, the first node is in an RRC idle state or an RRC inactive state, the first node performs cell reselection from the third node to the fifth node, and the third node and the fifth node correspond to two serving cells, respectively.

As a sub-embodiment of this embodiment, the first node does not send a second signal when the third node and the fifth node are connected to or subordinate to the same gNB; the first node transmits a second signal when the third node and the fifth node are connected to or subordinate to different gnbs.

As a sub-embodiment of this embodiment, when the third node and the fifth node are connected to or subordinate to the same gNB, the first node does not send a notifiationessagesidelink message; when the third node and the fifth node are connected to or subordinate to different gnbs, the first node transmits a notifiationessagesidelink message.

As a sub-embodiment of this embodiment, when the third node and the fifth node belong to the same system information area, the first node does not send a notificationassagesidelink message; when the third node and the fifth node belong to different system information areas, the first node transmits a notifiation essagesidelink message.

As a sub-embodiment of this embodiment, when the third node and the fifth node belong to the same RAN notification area, the first node does not send a notifiationassagesidelink message; when the third node and the fifth node belong to different RAN notification area areas, the first node transmits a notifiation essagesidelink message, wherein the RAN notification areas are indicated by RAN-area codes in system messages of the third node and the fifth node, respectively.

As a sub-embodiment of this embodiment, when the third node and the fifth node belong to the same tracking area, the first node does not send a notifiationassagesidelink message; when the third node and the fifth node belong to different tracking area regions, the first node transmits a notifiation essagesidelink message.

As a sub-embodiment of this embodiment, when the third node and the fifth node belong to the same PLMN, the first node does not send a notifiationassagesidelink message; when the third node and the fifth node belong to different PLMNs, the first node sends a notificationessagesidelink message.

Example 9

Embodiment 9 illustrates a schematic diagram of a topology according to one embodiment of the present application, as shown in fig. 9.

The first node in embodiment 9 corresponds to the first node of the present application, and the second node corresponds to the second node of the present application.

As an embodiment, the third node in fig. 9 corresponds to the first cell group of the present application.

As an embodiment, the third node in fig. 9 corresponds to the primary cell of the first cell group of the present application.

As an embodiment, the third node in fig. 9 corresponds to the gNB corresponding to the first cell group of the present application.

As an example, the third node in fig. 9 corresponds to the PCell of the first node of the present application.

As an embodiment, the third node in fig. 9 corresponds to a transmitting point of the primary cell group of the first node in the present application.

As an embodiment, the third node in fig. 9 corresponds to the MCG of the first node of the present application.

As an embodiment, the sixth node in fig. 9 is an L2U 2N relay UE.

As an embodiment, the first reconfiguration is for indicating an addition of an indirect path.

As one embodiment, the first node communicates with the third node using a direct path.

As a sub-embodiment of this embodiment, the direct path used by the first node is a wireless link b1 between the first node and the third node.

As a sub-embodiment of this embodiment, the direct path used by the first node is or comprises a radio bearer between the first node and the third node.

As a sub-embodiment of this embodiment, the direct path used by the first node is or includes an RLC bearer between the first node and the third node.

As a sub-embodiment of this embodiment, the direct path used by the first node is or includes a wireless channel between the first node and the third node.

As a sub-embodiment of this embodiment, the direct path of the first node is independent of the first reconfiguration.

As a sub-embodiment of this embodiment, the added indirect path is a communication link between the first node and the third node.

As a sub-embodiment of this embodiment, the added indirect path includes a sidelink radio link r2 between the first node and a sixth node.

As a sub-embodiment of this embodiment, the added indirect path comprises a wireless link d between the third node and a sixth node.

As a sub-embodiment of this embodiment, the first signaling indicates that the sixth node is a destination L2U 2N relay UE of the first node.

As a sub-embodiment of this embodiment, the added indirect path is a radio bearer between the first node and the third node that is forwarded by the sixth node.

As a sub-embodiment of this embodiment, the added indirect path includes a sidelink RLC bearer between the first node and the sixth node for transmitting data between the first node to the third node.

As a sub-embodiment of this embodiment, the added indirect path includes an RLC bearer between the sixth node and the third node for transmitting data between the first node to the third node.

As a sub-embodiment of this embodiment, the direct path between the first node and the third node is not taken out of use.

As a sub-embodiment of this embodiment, the first signaling does not trigger the first node to send a first signal.

As a sub-embodiment of this embodiment, the first signaling does not trigger the first node to send a notifiationless sip message.

As an embodiment, the first reconfiguration is used to indicate that the indirect path is released or stopped.

As a sub-embodiment of this embodiment, the indirect path released or taken out of use is a communication link between the first node and the third node.

As a sub-embodiment of this embodiment, the indirect path that is released or is out of use comprises a sidelink radio link r2 between the first node and a sixth node.

As a sub-embodiment of this embodiment, the non-direct path released or taken out of use comprises a wireless link d between the third node and a sixth node.

As a sub-embodiment of this embodiment, the first signaling indicates that the sixth node is no longer the destination L2U 2N relay UE of the first node.

As a sub-embodiment of this embodiment, the indirect path released or stopped from use is a radio bearer forwarded by the sixth node between the first node and the third node.

As a sub-embodiment of this embodiment, the released or out-of-use indirect path comprises a sidelink RLC bearer between the first node and the sixth node for transmitting data between the first node to the third node.

As a sub-embodiment of this embodiment, the released or inactive indirect path comprises an RLC bearer between the sixth node and the third node for transmitting data between the first node to the third node.

As an embodiment, the first reconfiguration is configured to instruct the indirect path of the first node to switch to another indirect path.

As a sub-embodiment of this embodiment, the L2U2N relay UE of the first node is switched from the sixth node to a node other than the sixth node.

As a sub-embodiment of this embodiment, the sixth node is an L2U2N relay UE selected by the first node before performing the first signaling.

As a sub-embodiment of this embodiment, after the first signaling is performed, the L2U2N relay UE of the first node is changed to a node other than the sixth node.

As an embodiment, the first node forwards data between the second node and the third node only via a direct path.

Example 10

Embodiment 10 illustrates a schematic diagram in which first signaling is used to indicate a first reconfiguration for a first cell group, as shown in fig. 10, according to one embodiment of the present application.

As an embodiment, the first reconfiguration is a field or a cell comprised by the first signaling.

As an embodiment, the first signaling is rrcrecon configuration, and the content included in the first signaling is used for RRC reconfiguration.

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

As a sub-embodiment of this embodiment, the first reconfiguration is a partial domain of the first signaling.

As an embodiment, the first signaling comprises a first domain, which is or comprises the first reconfiguration.

As a sub-embodiment of this embodiment, the first reconfiguration is for MCG when the first domain is a masterCellGroup; the first reconfiguration is for SCG when the first domain is a second reconfigurated cell group.

As an embodiment, the first signaling comprises a first domain comprising a second domain, the first reconfiguration being part of or the second domain.

As a sub-embodiment of this embodiment, the first domain is a masterCellGroup, or the first domain is a second-digit cellgroup.

As a sub-embodiment of this embodiment, the second domain is reconfigurationWithSync.

As an embodiment, the first signaling comprises a first domain comprising a third domain comprising a second domain, the first reconfiguration being part of or the third domain.

As a sub-embodiment of this embodiment, the third domain spCellConfig.

As a sub-embodiment of this embodiment, the first reconfiguration includes the second domain.

As a sub-embodiment of this embodiment, the first reconfiguration is for a group of cells indicated by the first domain.

As a sub-embodiment of this embodiment, the cell group indicated by the first domain included in the first signaling is the first cell group.

As an embodiment, the first reconfiguration is used to configure the first cell group.

As one embodiment, the first reconfiguration is to configure the T304 timer of the first cell group.

As one embodiment, the first reconfiguration is to configure the T404 timer of the first cell group.

As an embodiment, the first reconfiguration is used to configure T304 time-frequency resources of the first cell group.

As an embodiment, the first reconfiguration is to configure the timer of the first cell group.

As an embodiment, the first reconfiguration is for configuring an identity of the first node in the first cell group.

As an embodiment, the first reconfiguration is for configuring RLC bearers of the first cell group.

As an embodiment, the first reconfiguration is used to configure the MAC layer of the first cell group.

As an embodiment, the first reconfiguration is a conditional reconfiguration.

As an embodiment, the first reconfiguration is not a conditional reconfiguration.

Example 11

Embodiment 11 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. 11. In fig. 11, the processing means 1100 in the first node comprises a first receiver 1101 and a first transmitter 1102. In the case of the embodiment of the present invention in which the sample is a solid,

a first receiver 1101 that receives first signaling, which is used to indicate a first reconfiguration for a first cell group, and performs the first signaling;

a first transmitter 1102 that determines whether to transmit a first signal on a sidelink based on whether all conditions in a first set of conditions are met and whether the first cell group is a master cell group or a slave cell group;

wherein the first reconfiguration includes at least one of a cell handover and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; one condition of the first set of conditions includes: there is at least one U2N remote UE connected to the first node 1100; the sentence is based on whether all conditions in the first set of conditions are met and whether the first cell group is a master cell group or a slave cell group, the meaning of determining whether to send the first signal on the sidelink is: transmitting a first signal when all conditions in the first set of conditions are satisfied and the first cell group is a primary cell group; when the first cell group is a cell group or at least one condition of the first set of conditions is not satisfied, no first signal is sent.

As an embodiment, the first receiver 1101 starts a first timer in response to performing the first signaling;

As an embodiment, the first receiver 1101 receives second signaling;

As an embodiment, the first receiver 1101 receives third signaling, the third signaling including the first signaling and a first set of execution conditions;

As an embodiment, the first receiver 1101 performs cell reselection and selects a first cell;

the first transmitter 1102 determines whether to send a second signal on a sidelink according to the gNB to which the first cell belongs;

wherein the cell in which the first node 1100 resides before the act performs cell reselection is a second cell; the reason why the second signal is used to indicate that the second signal is sent is that cell reselection occurs, and the sentence is that, according to the gNB to which the first cell belongs, whether the second signal is sent on the sidelink is determined by: when the gNB to which the first cell belongs is different from the gNB to which the second cell belongs, a second signal is sent; and when the gNB to which the first cell belongs is the same as the gNB to which the second cell belongs, not transmitting a second signal.

As an embodiment, the first receiver 1101 detects that the first wireless link fails in a wireless link;

the first transmitter 1102 determines whether to transmit a third signal according to whether the first radio link is a radio link between the first node 1100 and a master cell group or a radio link between the first node and a cell group;

Wherein the third signal is higher layer signaling; the third signal is used to indicate that the reason for sending the third signal is that the first radio link fails in radio link, and the sentence is that whether to send the third signal is determined according to whether the first radio link is a radio link between the first node 1100 and a master cell group or a radio link between the first node 1100 and a cell group, which means that: transmitting a third signal when the first wireless link is a wireless link between the first node 1100 and a primary cell group; when the first wireless link is a wireless link between the first node 1100 and a cell group, no third signal is sent.

As an embodiment, the first receiver 1101 detects that the second radio link fails in radio link; the second wireless link is a wireless link between the first node 1100 and a fourth node; the fourth node is a remote UE;

the first transmitter 1102 transmits a fourth signal; the first node 1100 is a relay between a receiver of the fourth signal and the fourth node;

wherein the fourth signal is used to indicate that the reason for transmitting the fourth signal is that a radio link failure occurred; the fourth signal includes a first SCI and a first MAC PDU, the first SCI including N bits of an identity of the receiver of the fourth signal and a header of the first MAC PDU including bits other than the N bits of the identity of the receiver of the fourth signal; n is a positive integer.

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 or a ship.

As an embodiment, the first node is a mobile phone or a vehicle terminal.

As an embodiment, the first node is a relay UE and/or a U2N relay UE.

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

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

As an embodiment, the first node is a sidelink communication node.

As an example, the first receiver 1101 includes at least one of the antenna 452, the receiver 454, the receive processor 456, the multi-antenna receive processor 458, the controller/processor 459, the memory 460, or the data source 467 in example 4.

As an example, the first transmitter 1102 may include 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 example 4.

Example 12

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

a second receiver 1202 for receiving the first signal on the sidelink; performing a first operation according to an RRC state in response to receiving the first signal;

wherein a sender of the first signal receives first signaling in a main link and performs the first signaling; the first signaling is used to indicate a first reconfiguration for a first group of cells; the first cell group is a master cell group; the first reconfiguration includes at least one of a cell switch and a path switch; the first signal is used to indicate that a reason for transmitting the first signal is related to the first reconfiguration; the second node 1200 is a U2N remote UE connected to the sender of the first signal; the meaning of the sentence performing the first operation according to the RRC state is: the first operation is connection reestablishment when the second node 1200 is in an RRC connected state; the first operation is relay reselection when the second node 1200 is in an RRC idle state or an RRC inactive state; the RRC state of the second node 1200 is one of an RRC connected state, an RRC idle state, and an RRC inactive state.

As an embodiment, the second receiver 1202 receives a second signal, which is used to indicate that the reason for transmitting the second signal is that a cell reselection has occurred.

As an embodiment, the second receiver 1202 receives a third signal, where the third signal is used to indicate that the reason for sending the third signal is that the first radio link fails.

As an embodiment, the second receiver 1202 receives a fourth signal, where the fourth signal is used to indicate that the reason for transmitting the fourth signal is that a radio link failure occurs; the second wireless link is a wireless link between a sender of the fourth signal and a fourth node; the fourth node is a remote UE; the fourth signal includes a first SCI including N bits of an identity of the second node 1200 and a first MAC PDU whose header includes bits other than the N bits of the identity of the second node 1200; n is a positive integer.

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

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

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

As an embodiment, the second node is an aircraft or a ship.

As an embodiment, the second node is a mobile phone or a vehicle terminal.

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

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

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

As an embodiment, the second node is a sidelink communication node.

As an example, the second receiver 1202 may include at least one of the antenna 452, the receiver 454, the receive processor 456, the multi-antenna receive processor 458, the controller/processor 459, the memory 460, or the data source 467 of example 4.

As an example, the second transmitter 1201 includes at least one of the antenna 452, the transmitter 454, the transmission processor 468, the multi-antenna transmission processor 457, the controller/processor 459, the memory 460, or the data source 467 in example 4.

Those of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described methods may be implemented by a program that instructs associated hardware, and the program may be stored on a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiment may be implemented in a hardware form or may be implemented in a software functional module form, and the application is not limited to any specific combination of software and hardware. User equipment, terminals, and UEs in the present application include, but are not limited to, unmanned aerial vehicles, communication modules on unmanned aerial vehicles, remote control airplanes, aircraft, mini-planes, cell phones, tablet computers, notebooks, vehicle-mounted communication devices, wireless sensors, network cards, internet of things terminals, RFID terminals, NB-IoT terminals, MTC (Machine Type Communication ) terminals, eMTC (enhanced MTC) terminals, data cards, network cards, vehicle-mounted communication devices, low cost cell phones, low cost tablet computers, satellite communication devices, ship communication devices, NTN user devices, and other wireless communication devices. The base station or system device in the present application includes, but is not limited to, a macro cell base station, a micro cell base station, a home base station, a relay base station, a gNB (NR node B) NR node B, a TRP (Transmitter Receiver Point, transmitting/receiving node), 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. Accordingly, the presently disclosed embodiments are considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A first node for wireless communication, comprising:

2. The first node of claim 1, wherein the first node,

the first receiver, in response to performing the first signaling, starting a first timer;

3. The first node of claim 1, comprising:

the first receiver receives a second signaling;

4. The first node of claim 1, comprising:

the first receiver receiving third signaling, the third signaling comprising the first signaling and a first set of execution conditions;

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

the first receiver performs cell reselection and selects a first cell;

the first transmitter determines whether to transmit a second signal on a sidelink according to the gNB to which the first cell belongs;

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

the first receiver detects that a first wireless link fails in a wireless link;

the first transmitter determining whether to transmit a third signal based on whether the first wireless link is a wireless link between the first node and a master cell group or a wireless link between the first node and a cell group;

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

The first receiver detects that a second wireless link fails in a wireless link; the second wireless link is a wireless link between the first node and a fourth node; the fourth node is a remote UE;

the first transmitter transmits a fourth signal; the first node is a relay between a receiver of the fourth signal and the fourth node;

8. The first node according to any of the claims 1 to 4, characterized in that,

the first set of conditions includes: the first reconfiguration includes: stopping using the direct path;

9. A second node for wireless communication, comprising:

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

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