CN116137705A

CN116137705A - Method and apparatus for wireless communication

Info

Publication number: CN116137705A
Application number: CN202111368650.8A
Authority: CN
Inventors: 陈宇; 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2023-05-19

Abstract

A method and apparatus for wireless communication includes entering a first state in response to a first set of conditions being satisfied; executing a first set of operations in the first state; transitioning from the first state to a second state in response to any condition in the second set of conditions being met; transitioning from the first state to a normally resident state in response to any of a third set of conditions being met; by receiving the first condition set and the second condition set, the state can be reasonably determined.

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 sidelink communication, relay, cell selection, reselection, and the like in wireless communication.

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, and forms a series of standards including 38.304,38.211,38.213,38.331, etc., and reference may be made to the standard content:

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

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

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

https://www.3gpp.org/ftp/Specs/archive/38_series/38.331/38331-g50.zip

disclosure of Invention

In various communication scenarios, the use of a relay may be involved, for example, when one UE is not within the coverage area of a cell, the network may be accessed through the relay, and the relay node may be another UE (U2N relay UE). The relay mainly comprises a layer 3 relay and a layer 2 relay (L2 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 in layer 2 relay, the remote node and the access network may have an RRC connection, the access network may manage the remote node, and a radio bearer may be established between the access network (RAN) and the remote node. In layer 2 relay, the remote node needs to establish an RRC connection with the access network through the relay node. A UE in different RRC states, including rrc_connected, rrc_idle, rrc_inactive states, especially non-RRC CONNECTED states, needs explicit methods for cell selection and reselection, mainly by a series of states and transition conditions between states, but introduction of relays, especially layer 2 relays, allows a remote node to receive system messages of cells from cells not satisfying the required PLMN, but initiate emergency services, but obviously, this connection mode is different from the camping on any cell (camped on any cell) without relay, so that the existing methods of cell selection and reselection of layer 2 relays are contradictory, and new methods and mechanisms are needed to solve the problem, to establish a more accurate and robust cell selection reselection mechanism, as a solution for mobility management in the non-RRC CONNECTED state.

The above-mentioned 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:

entering a first state in response to the first set of conditions being satisfied; executing a first set of operations in the first state;

transitioning from the first state to a second state in response to any condition in the second set of conditions being met; transitioning from the first state to a normally resident state in response to any of a third set of conditions being met;

wherein the first set of operations includes: monitoring a first system information set through a first relay, and executing reselection evaluation; the first condition set includes at least: a suitable relay is found and no suitable cell is found, or the first set of conditions comprises at least: an acceptable relay is found and no suitable cell is found; the second state only supports the first service set; the unicast traffic in the first traffic set comprises only emergency traffic; in the second state, an RRC connection is established; the third set of conditions includes at least the condition that a suitable cell has been found.

As one embodiment, the problems to be solved by the present application include: in a scenario involving relaying, especially layer 2 relaying, how cell selection and reselection in the relaying scenario is supported by appropriate state and appropriate state transition conditions.

As one example, the benefits of the above method include: the cell selection and reselection method provided by the application can be suitable for the scene that the UE uses the layer 2 relay, in particular to the cell selection and reselection of the non-RRC connection state through the layer 2 relay.

Specifically, according to one aspect of the present application, in response to the fourth set of conditions being met, transitioning from the first state to an arbitrary cell selection state; the fourth set of conditions includes at least a condition that cell selection is performed and no acceptable cells are found.

Specifically, according to one aspect of the present application, in response to the fifth set of conditions being met, transitioning from the first state to a camped on any cell state; the fifth set of conditions includes a condition that at least an acceptable cell is found and no suitable cell is found.

Specifically, according to one aspect of the present application, the PLMN of the serving cell of the first relay is not the PLMN selected by the first node, nor the PLMN registered by the first node, nor the equivalent PLMN list of the first node.

Specifically, according to one aspect of the present application, the first state is a camping on any cell state, and the first condition set includes that a suitable relay is found and that a serving cell of the found suitable relay only supports the first service set.

Specifically, according to one aspect of the present application, the first state is a camped on any cell state, and the first condition set includes finding an acceptable relay.

Specifically, according to one aspect of the present application, relay selection is performed and a suitable relay is found and the found PLMN of the serving cell of the suitable relay is either the PLMN selected by the first node or the PLMN registered by the first node or an equivalent PLMN list belonging to the first node; leaving the first state.

Specifically, according to one aspect of the present application, cell selection reselection evaluation is performed and cells meeting a first quality criterion are not found before the behavior enters the first state;

wherein the first state is a camp-on arbitrary cell state; under the assumption that no relay is used: an acceptable cell is a cell that meets the first quality criterion and the condition to enter the camped on any cell state includes that no suitable cell is found to be an acceptable cell, and the first node enters the any cell selection state.

Specifically, according to one aspect of the present application, the first cell is determined to be an acceptable cell according to the second criterion; the first cell does not meet a first quality criterion;

wherein an acceptable cell is a cell that meets the first quality criterion on the assumption that no relay is used; the second criterion includes: the first cell is a serving cell of the first relay, the first cell being unblocked.

Specifically, according to one aspect of the present application, cell selection and relay selection are performed, and a PLMN in which a suitable cell is not found and a serving cell is not found either is a PLMN selected by the first node or is a PLMN registered by the first node or is a relay belonging to an equivalent PLMN list of the first node; determining that a serving cell of the first relay is an acceptable cell;

wherein the first relay is in a normal resident state or a connected mode, and a PLMN of a serving cell of the first relay is not a PLMN selected by the first node, is not a PLMN registered by the first node, and is not an equivalent PLMN list of the first node.

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

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 vehicle-mounted terminal.

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

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

a first receiver that enters a first state in response to a first set of conditions being satisfied; executing a first set of operations in the first state;

a first processor that transitions from the first state to a second state in response to any one of a second set of conditions being met; transitioning from the first state to a normally resident state in response to any of a third set of conditions being met;

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

the selection and reselection of relays can be well fused with the reselection of cells, but without excessive interaction to avoid unnecessary complexity.

The contradiction caused by the common cell selection and reselection methods in the scene of using layer 2 relay is avoided.

The scope of selecting the relay is enlarged, namely when the PLMN of the service cell of the relay can not meet all service requirements, the relay can be selected under the condition that no better relay or cell is selected.

The remote UE may enter a camped on any cell state through relay.

The remote UE may enter the RRC connected state outside of coverage.

Cell selection and reselection may also be performed by the remote UE when it is out of coverage.

The remote UE may also initiate emergency services through relay when out of coverage.

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 for entering a first state, transitioning from the first state to a second state, and transitioning from the first state to a normal park state, 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 illustrates a schematic diagram of state transitions according to one embodiment of the present application;

FIG. 9 illustrates a schematic diagram of state transitions according to one embodiment of the present application;

FIG. 10 illustrates a schematic diagram of state transitions 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.

Detailed Description

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

Example 1

Embodiment 1 illustrates a flow chart for entering a first state, transitioning from the first state to a second state, and transitioning from the first state to a normal resident state, as shown in fig. 1, according to one embodiment of the present application. 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 enters a first state in step 101; transitioning from the first state to the second state in step 102; transition from the first state to the normally resident state in step 103;

the first node enters a first state as a response that the first condition set is satisfied; executing a first set of operations in the first state; transitioning from the first state to a second state in response to any condition in the second set of conditions being met; transitioning from the first state to a normally resident state in response to any of a third set of conditions being met; the first set of operations includes: monitoring a first system information set through a first relay, and executing reselection evaluation; the first condition set includes at least: a suitable relay is found and no suitable cell is found, or the first set of conditions comprises at least: an acceptable relay is found and no suitable cell is found; the second state only supports the first service set; the unicast traffic in the first traffic set comprises only emergency traffic; in the second state, an RRC connection is established; the third set of conditions includes at least the condition that a suitable cell has been found.

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

As an embodiment, the first node is not operating in an SNPN AM (Access Mode).

As an embodiment, a direct path (direct path) refers to a UE-to-network transmission path by which transmission means that data is sent 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 one embodiment, an indirect path refers to a transmission path of a UE to a Network, through which data is transmitted, meaning that the data is forwarded between a remote UE of the UE to the Network (U2N, UE-to-Network) and the Network via a relay UE of the UE to the Network (U2N, UE-to-Network).

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

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 direct path or 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 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 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 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 transmit or directly transmit the MAC CE 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, there is only a direct path or only an indirect path between the first node and the network.

As one embodiment, the phrase switching from a direct path to an indirect path means: the indirect path starts to be used while the direct path stops to be used.

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

As one embodiment, the phrase switching from a direct path to an indirect path means: from direct path transmission to indirect path transmission.

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

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

As one embodiment, the reselection evaluation includes a cell reselection evaluation and a relay reselection evaluation.

As one embodiment, the reselection evaluation comprises a relay reselection evaluation.

As an embodiment, the reselection evaluation comprises a cell reselection evaluation.

As one embodiment, the reselection evaluation comprises a relay selection evaluation.

As an embodiment, the reselection evaluation comprises a cell selection evaluation.

As an embodiment, the first node cannot transition from the arbitrary cell selection state to the second state without going through an intermediate state or an intermediate procedure.

As an embodiment, both the first state and the second state are states that can stay for a long period of time.

As a sub-embodiment of this embodiment, a non-long-term stay state, which refers to a state entered for performing cell selection or reselection, as opposed to the long-term stay, and in which a suitable cell is found or not, the other state is exited and entered.

As an embodiment, the first state is a camped on any cell (camped on any cell) state.

As one embodiment, the first state is not a normal resident (normal) state.

As an embodiment, the first state is camping on any cell by relay.

As an embodiment, the first state is non-direct (direct) camping on any cell.

As one embodiment, the name of the first state includes a relay.

As one embodiment, the name of the first state includes a resident (camp).

As an embodiment, the name of the first state includes direct.

As an embodiment, the second state is a Connected mode (Connected mode).

As an embodiment, the second state is not Connected mode.

As an embodiment, the second state is a non-direct connection mode (indirect Connected mode).

As an embodiment, the second state is a state or mode of a connection through a relay.

As one embodiment, the name of the second state includes a relay.

As one embodiment, the name of the second state includes Connected.

As one embodiment, when the first node is in the first state, the first node determines whether to enter the second state according to the second condition set.

As an embodiment, when the first node is in the first state, the first node determines whether to enter the arbitrary cell selection state according to the fourth condition set.

As an embodiment, the arbitrary cell selection (any cell selection) state is applied to rrc_idle and rrc_inactive states; in the arbitrary cell selection state, the UE needs to perform a cell selection procedure to find (find) a suitable cell (useable cell), and if no suitable cell is found in all UEs supported RATs (radio access technology ) and all frequency bands through the cell selection procedure and the UE is not in the SNPN AM, it should attempt to find an acceptable cell (useable cell) camping of an arbitrary PLMN, it should attempt and first search for a high quality cell on all UEs supported RATs.

As a sub-embodiment of this embodiment, the UE does not support L2U 2N relay.

As a sub-embodiment of this embodiment, the UE does not find a suitable L2U 2N relay.

As an embodiment, if one UE is not camping on any cell, the one UE should be in the arbitrary cell selection state.

As a sub-embodiment of this embodiment, the one UE does not find a suitable L2U 2N relay UE.

As a sub-embodiment of this embodiment, the one UE does not find a suitable L2U 2N relay.

As a sub-embodiment of this embodiment, the one UE does not support L2U 2N relay.

As an embodiment, a UE in an arbitrary cell selection state should perform relay selection to find a suitable relay.

As a sub-embodiment of this embodiment, the relay is an L2U 2N relay.

As one embodiment, the UE in the first state should perform relay selection in an attempt to find a suitable relay.

As a sub-embodiment of this embodiment, the relay is an L2U 2N relay.

As an embodiment, the UE in the first state should perform cell selection in an attempt to find a suitable relay.

As one embodiment, when the first node is in the first state and any one of the second set of conditions is satisfied, the first node transitions (transit) from the first state to the second state.

As a sub-embodiment of this embodiment, the first node transitions from the first state to the second state without passing through other states.

As one embodiment, when the first node is in the first state and any one of the third set of conditions is satisfied, the first node transitions (transit) from the first state to the normal resident state.

As a sub-embodiment of this embodiment, the first node transitions from the first state to the normal resident state without going through other states and without going through other processes.

As an embodiment, the first state may be directly transferred to the connected mode.

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

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

As one embodiment, the first relay is an L2 relay.

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

As an embodiment, any operation in the first set of operations has an opportunity to be performed.

As an embodiment, the first node listens (monitor) through the first relay for a first set of system information.

As a sub-embodiment of this embodiment, the first set of system information comprises at least one system information block.

As a sub-embodiment of this embodiment, the first set of system information comprises at least part or all of the bits of a MIB (master information block ).

As a sub-embodiment of this embodiment, the first set of system information comprises at least part or all of the bits of SIB 1.

As a sub-embodiment of this embodiment, the first set of system information includes at least some or all of the bits of SIB 12.

As an embodiment, the act of listening to the first set of system information through the first relay comprises: the first node receives the first set of system information forwarded by the first relay.

As a sub-embodiment of this embodiment, the first set of system information comprises SIBs (system information block, system information blocks).

As a sub-embodiment of this embodiment, the act of receiving the first set of system information forwarded by the first relay includes receiving at least one system information block.

As a sub-embodiment of this embodiment, the first relay forwards the first set of system information via a discovery message.

As a sub-embodiment of this embodiment, the first relay forwards the first set of system information via a PC5-S message.

As a sub-embodiment of this embodiment, the first relay forwards the first set of system information via a PC5-RRC message.

As a sub-embodiment of this embodiment, the first relay forwards system information according to a block of system information that is of interest or request to the first node as indicated by the first node.

As a sub-embodiment of this embodiment, the first relay requests and/or receives system information after receiving an indication of the first node to request system information.

As an embodiment, the act of listening to the first set of system information through the first relay comprises: the first node receives an indication of a change in related system information sent by the first relay.

As a sub-embodiment of this embodiment, the indication of the change in related system information is for system information in the first set of system information.

As a sub-embodiment of this embodiment, the system information corresponding to the indication of the change in the system information and the indication of the change in the system information are simultaneously transmitted by the first relay.

As a sub-embodiment of this embodiment, the first node requests system information from the first relay according to the indication of the system information change.

As a sub-embodiment of this embodiment, the first node requests system information from the first relay after receiving the indication of the change in the related system information.

As an embodiment, the first set of operations includes listening for a Short Message (Short Message) through the first relay.

As a sub-embodiment of this embodiment, the short message is not an SMS.

As a sub-embodiment of this embodiment, the sender of the short message comprises a cell or a base station, which is carried by DCI (downlink control information) at the time of Uu interface transmission.

As a sub-embodiment of this embodiment, the short message comprises 8 bits.

As a sub-embodiment of this embodiment, the second bit of the short message is used to indicate an alarm.

As a sub-embodiment of this embodiment, the second bit of the short message is used to indicate ETWS (Earthquake and Tsunami Warning System, earthquake tsunami warning system) and CMAS (Commercial Mobile Alert Service ).

As a sub-embodiment of this embodiment, the first bit of the short message does not indicate an alarm.

As a sub-embodiment of this embodiment, the first bit of the short message indicates a system message change.

As a sub-embodiment of this embodiment, the third bit of the short message indicates to stop paging monitoring.

As a sub-embodiment of this embodiment, the first relay monitors the short message sent by the cell or the base station for the first node according to the P-RNTI of the first node.

As an embodiment, the first set of operations does not include listening for a Short Message (Short Message) by the first relay.

As an embodiment, the first state is applicable only to rrc_idle and rrc_inactive states.

As an embodiment, the first state is only applicable to non-RRC CONNECTED states, i.e. states other than the rrc_connected state.

As an embodiment, the first set of operations comprises performing necessary measurements related to cell selection and/or reselection.

As one embodiment, the first set of operations includes performing necessary measurements related to relay selection and/or reselection.

As one embodiment, cell selection reselection refers to cell selection and/or cell reselection.

As one embodiment, the action performing reselection evaluation includes at least one of { performing cell selection evaluation, performing cell reselection evaluation, performing relay selection evaluation, performing relay reselection evaluation }.

As an embodiment, the relay of the present application refers to an L2U 2N relay UE.

As an embodiment, the L2U 2N relay of the present application refers to an L2U 2N relay UE.

As an embodiment, the cell selection reselection in the first state refers to cell reselection.

As an embodiment, the cell selection reselection in the arbitrary cell selection state refers to cell selection.

As an embodiment, when using L2U 2N relay, in the first state, the first node may perform cell selection.

As an embodiment, when using L2U 2N relay, in the first state, the first node performs only cell selection and does not perform cell reselection.

As an embodiment, when using L2U 2N relay, in the normal stay state, the first node may perform cell selection.

As a sub-embodiment of this embodiment, when using L2U 2N relay, in the normal stay state, the first node performs only cell selection and not cell reselection.

As an embodiment, when L2U 2N relay is not used, in the normal stay state, the first node performs only cell reselection and not cell selection.

As an embodiment, when using L2U 2N relay, the first node may perform cell selection in the camped on any cell state.

As a sub-embodiment of this embodiment, when using L2U 2N relay, in the camped on any cell state, the first node performs only cell selection and not cell reselection.

As an embodiment, when L2U 2N relay is not used, in the camped on any cell state, the first node performs only cell reselection and not cell selection.

As one embodiment, the act of performing a reselection evaluation includes performing a cell selection and/or reselection procedure.

As a sub-embodiment of this embodiment, the condition for triggering the execution of the cell reselection procedure comprises the first node internally triggering to meet a performance requirement.

As a sub-embodiment of this embodiment, the conditions triggering the execution of the cell reselection procedure comprise receiving information on the BCCH (broadcast control channel ) that the cell reselection evaluation procedure has changed.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises receiving a failure message of the first relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises receiving a radio link failure message of the first relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises receiving an indication of the occurrence of a handover of the first relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises receiving an indication that the camping cell of the first relay is not available.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises receiving an indication of no coverage of the first relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises receiving an indication of a link release of the first relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises receiving an indication of blocked (barred) of the first relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises receiving an indication of the first relay entering any cell selection state by the first relay.

As a sub-embodiment of this embodiment, an indication is received that the first relay of the first relay enters a camped on any cell state.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises a failure or release of a link with the first relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises that the link with the first relay fails to meet QoS requirements.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises a link quality with the first relay being below a certain threshold.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises that no message or feedback related to the keep alive message of the first relay is received.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises that the first relay is no longer a suitable relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises that the first relay is no longer a suitable L2U 2N relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises that the cell in which the first node resides is no longer a suitable cell.

As a sub-embodiment of this embodiment, the condition triggering the execution of the cell reselection procedure comprises being in the first state.

As one embodiment, the act of performing reselection evaluation includes performing L2U 2N relay selection and/or reselection procedures.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises that the first relay is no longer a suitable L2U 2N relay.

As a sub-embodiment of this embodiment, the conditions that trigger the execution of the L2U 2N relay selection and/or reselection procedure include that the current L2U 2N relay is no longer a suitable L2U 2N relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises an internal factor triggering of the first node.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises that the cell in which the first node resides is no longer a suitable cell.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises that the cell in which the first relay resides is no longer a suitable cell.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises that the quality of the cell in which the first node resides is below a certain threshold.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises that the link quality between the first node and the first relay is below a certain threshold.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises the first node transmitting a suitable cell.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises the first node discovering cells with a quality above a certain threshold.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises that the link between the first node and the first relay is released or fails.

As a sub-embodiment of this embodiment, the condition triggering execution of the L2U 2N relay selection and/or reselection procedure comprises the first relay instructing the first node to perform the L2U 2N relay selection or reselection.

As a sub-embodiment of this embodiment, the conditions that trigger the execution of the L2U 2N relay selection and/or reselection procedure include the discovery of a better signal quality L2U 2N relay.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises that said first relay is blocked.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises that the first relay fails in radio link.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises the first node leaving the RRC connected state.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises the first node leaving the second state.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises the first node entering an arbitrary cell selection state.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises the first node entering a camped on any cell state.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure includes reaching a specific time.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure includes entering a specific area.

As a sub-embodiment of this embodiment, the conditions triggering the execution of the L2U 2N relay selection and/or reselection procedure include meeting certain requirements with the location of a certain reference point.

As a sub-embodiment of this embodiment, the conditions triggering the execution of the L2U 2N relay selection and/or reselection procedure include meeting certain requirements with the location of certain two specific reference points.

As a sub-embodiment of this embodiment, the condition triggering the execution of the L2U 2N relay selection and/or reselection procedure comprises being in said first state.

As an embodiment, the action performing reselection evaluation includes cell selection and/or reselection evaluation, and L2U 2N relay selection and/or reselection evaluation.

As a sub-embodiment of this embodiment, when the first node finds a suitable cell, but does not find a suitable L2U 2N relay, the first node enters a normal camping state and camps on the found suitable cell.

As a sub-embodiment of this embodiment, the first node enters the first state when the first node does not find a suitable cell, but finds a suitable L2U 2N relay.

As a sub-embodiment of this embodiment, when the first node does not find a suitable cell, but finds a suitable L2U 2N relay, the first node enters the first state and resides in the found L2U 2N relay.

As a sub-embodiment of this embodiment, when the first node does not find a suitable cell, but finds a suitable L2U 2N relay, the first node enters the first state and camps on the PCell or serving cell of the found L2U 2N relay.

As a sub-embodiment of this embodiment, the first state is a normal park state.

As a sub-embodiment of this embodiment, when the first node finds a suitable cell and also a suitable L2U 2N relay, the first node selects between the suitable cell and the suitable L2U 2N relay according to an internal algorithm.

As one example, a suitable relay is a suitable L2U 2N relay.

As one embodiment, the suitable relay is a suitable L2U 2N relay UE.

As one embodiment, the acceptable relay is an acceptable L2U 2N relay.

As one embodiment, the acceptable relay is an acceptable L2U 2N relay UE.

As one example, a suitable L2 relay is a suitable L2U 2N relay.

As one embodiment, the suitable L2 relay is a suitable L2U 2N relay UE.

As one embodiment, an acceptable L2 relay is an acceptable L2U 2N relay.

As one embodiment, the acceptable L2 relay is an acceptable L2U 2N relay UE.

As an embodiment, the first relay is a suitable (relay).

As an embodiment, the first relay is an acceptable (acceptable) relay.

As one example, a suitable L2 relay is one that meets the second quality requirement.

As a sub-embodiment of this embodiment, the second quality requirement is or includes that the radio channel quality of the sidelink between the first node and the candidate relay is greater than or not less than a certain threshold.

As a sub-embodiment of this embodiment, the second quality requirement is or includes that the SL-RSRP measurement is above or not below a certain threshold.

As a sub-embodiment of this embodiment, the second quality requirement is or includes that the SD-RSRP measurement is above or not below a certain threshold.

As a sub-embodiment of this embodiment, the second quality requirement is for a radio channel quality between the first node and a candidate relay.

As a sub-embodiment of this embodiment, the second quality requirement is for a sidelink channel quality between the first node and a candidate relay.

As a sub-embodiment of this embodiment, the second quality requirement is for SL-RSRP and/or SD-RSRP measurements between the first node and candidate relays.

As one embodiment, an acceptable L2 relay is one that meets the second quality requirement.

As an embodiment, the suitable L2 relay is or includes an unblocked relay.

As an embodiment, the suitable L2 relay is or comprises a relay of cells where the camped cell is acceptable for the first node.

As an embodiment, the acceptable L2 relay is or comprises a relay in which the cell in which the L2 relay is camping is acceptable for the first node, wherein the cell in which the acceptable L2 relay is camping is a suitable cell for the L2 relay.

As an embodiment, the acceptable L2 relay is or comprises a relay in which the cell in which the L2 relay is camping is acceptable for the first node, wherein the cell in which the L2 relay is acceptable is an acceptable cell of the L2 relay.

As one example, the suitable L2 relay is or includes: PCell is a relay of a suitable cell, which is in RRC connected state.

As one example, the suitable L2 relay is or includes: the serving cell is a relay of a suitable cell, which is in an RRC connected state.

As one example, the suitable L2 relay is or includes: the PCell belongs to the PLMN selected or registered by the first node or belongs to a PLMN of the equivalent PLMN list, and the appropriate relay is in RRC connected state.

As one example, the suitable L2 relay is or includes: the serving cell belongs to the PLMN selected by the first node or the registered PLMN or belongs to a PLMN of the equivalent PLMN list, and the suitable relay is in a non-RRC connected state.

As one embodiment, the acceptable L2 relay is or includes: the PCell does not belong to the PLMN selected by the first node or to an L2 relay of a registered PLMN and does not belong to a PLMN of the equivalent PLMN list, and the acceptable relay is in RRC connected state.

As one embodiment, the acceptable L2 relay is or includes: the serving cell does not belong to the PLMN selected or registered by the first node nor to a PLMN of the equivalent PLMN list, and the acceptable relay is in a non-RRC connected state.

As one example, the suitable L2 relay is or includes: a relay of at least core system information is provided or may be provided.

As one example, the suitable L2 relay is or includes: and the relay meeting the QoS requirement.

As one example, the suitable L2 relay is or includes: relay meeting NAS layer requirements.

As one example, the suitable L2 relay is or includes: the indicated RSC is a relay that meets the L2 relay requirement.

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

As one example, the suitable L2 relay is or includes: a relay of the PC5 connection is established.

As one example, the suitable L2 relay is or includes: a relay of a Direct link is established.

As a sub-embodiment of this embodiment, the PC5-S message used for the establishment of the direct link comprises RSC.

As a sub-embodiment of this embodiment, the establishment of the DIRECT link includes sending a direct_communication_request message.

As one example, the suitable L2 relay is or includes: a relay of system information from the appropriate L2 relay is received.

As one example, the suitable L2 relay is or includes: a relay of system information from the core of the suitable L2 relay is received.

As one example, the suitable L2 relay is or includes: the first node indicates to it a relay of information related to receiving a page.

As one example, the suitable L2 relay is or includes: the first node indicates to it the relay that received the paging related information and was acknowledged.

As one example, the suitable L2 relay is or includes: relay with the ability to monitor paging messages of the first node.

As one example, the suitable L2 relay is or includes: the relay of the paging message of the first node can be monitored.

As one example, the suitable L2 relay is or includes: relay capable of forwarding notifications of the network.

As one example, the suitable L2 relay is or includes: no relay of radio link failure occurs.

As one example, the suitable L2 relay is or includes: the measured SL-RSRP and/or SD-RSRP meets the L2U2N relay of certain requirements.

As a sub-embodiment of this embodiment, the first node performs measurements for candidate relays to obtain the SL-RSRP and/or the SD-RSRP.

As a sub-embodiment of this embodiment, a candidate relay performs a measurement for the first node to obtain the SL-RSRP and/or the SD-RSRP.

As one example, the suitable L2 relay is or includes: the measured SL-RSRQ and/or SD-RSRQ meet certain requirements of the L2U2N relay.

As a sub-embodiment of this embodiment, the first node performs measurements for candidate relays to obtain the SL-RSRQ and/or SD-RSRQ.

As a sub-embodiment of this embodiment, a candidate relay performs a measurement for the first node to obtain the SL-RSRQ and/or the SD-RSRQ.

As one example, the suitable L2 relay is or includes: relay that does not receive a direct link release or reject indication.

As one example, the suitable L2 relay is or includes: the direct link with it is an active (active) relay.

As one example, the suitable L2 relay is or includes: a relay in a normal resident state or a relay in an RRC connected state.

As one embodiment, the phrase RRC connection is established includes establishing (establish) an RRC connection.

As one embodiment, the phrase RRC connection is established including a continue (resume) RRC connection.

As one embodiment, the phrase RRC connection is established including re-establishing (re-establishment) an RRC connection.

As an embodiment, the first node enters an RRC connected state when the RRC connection is established.

As an embodiment, the first node has an RRC connection with the access network when the RRC connection is established.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN includes initiating a registration procedure for the PLMN or SNPN.

As a sub-embodiment of this embodiment, the registration process includes sending a request for NAS layer-related registration (registration).

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN includes completing a registration process for the PLMN or SNPN.

As a sub-embodiment of this embodiment, the registration process includes receiving an allowed response of a registration of interest (registration) of the NAS layer.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN includes the paging message from a PLMN or SNPN, upon transmission to a serving cell or base station, triggering the serving cell or base station air interface to transmit a paging message and/or DCI related to paging.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: a paging message sent by the registered PLMN is received.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: the paging message sent by the equivalent PLMN of the registered PLMN is received.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: the NAS layer registration procedure is performed and a paging message sent for the PLMN is received.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: in the registered state, a paging message sent for the PLMN is received.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: the paging message sent for the PLMN is received with respect to the NAS or core network in a registered state.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: a paging message sent by the registered SNPN is received.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: paging messages sent by equivalent PLMNs of the registered SNPNs are received.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: the NAS layer registration procedure is performed and a paging message sent for the SNPN is received.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: in the registered state, a paging message transmitted for the SNPN is received.

As one embodiment, the phrase registering and receiving a paging message from a PLMN or SNPN comprises: the paging message sent for the SNPN is received with respect to the NAS or core network being in a registered state.

As one embodiment, the acceptable L2 relay is or includes: a relay of system information is provided or may be provided.

As one embodiment, the acceptable L2 relay is or includes: the indicated RSC is a relay that meets the L2 relay requirement.

As a sub-embodiment of this embodiment, the relay service code indicates support for emergency services.

As one embodiment, the acceptable L2 relay is: a relay of the PC5 connection is established.

As one embodiment, the acceptable L2 relay is: a relay of a Direct link is established.

As one embodiment, the acceptable L2 relay is or includes: a relay of system information from the acceptable L2 relay is received.

As one embodiment, the acceptable L2 relay is or includes: no relay of radio link failure occurs.

As one embodiment, the acceptable L2 relay is or includes: relay that does not receive a direct link release or reject indication.

As one embodiment, the acceptable L2 relay is or includes: the direct link with it is an active (active) relay.

As one embodiment, the acceptable L2 relay is or includes: a relay in a normal resident state or a relay in an RRC connected state.

As one embodiment, the acceptable L2 relay is or includes: relay in RRC connected state.

As an embodiment, the core network and the access network may have respective paging messages, such as paging messages from the core network or PLMN or SNPN, which are referred to herein as paging or paging messages on the RAN side, without particular emphasis.

As an embodiment, the first node is not registered on the PLMN indicated by the first relay.

As an embodiment, the first set of conditions includes a condition that a suitable relay is found.

As an embodiment, the first set of conditions includes a condition that an acceptable relay is found.

As one embodiment, the meaning of the response that the phrase is satisfied as the first set of conditions is: in response to all conditions in the first set of conditions being satisfied.

As one embodiment, the meaning of the response that the phrase is satisfied as the first set of conditions is: as a response to any of the first set of conditions being met.

As one embodiment, the first state is a state other than normal resident.

As one embodiment, the first state may transition to the normal resident state and/or the normal resident state may transition to the first state.

As one embodiment, the first quality criterion in the present application is the S criterion.

As an embodiment, the first quality criterion in the present application is:

srxlev >0 and square >0

Wherein the Srxlev is a cell select RX level value in dB; the square is the cell selection quality value in dB.

As a sub-embodiment of this embodiment:

Srxlev＝Q _rxlevmeas –(Q _rxlevmin +Q _{rxlevminoffset} )–P _compensation -Qoffset _temp

Squal＝Q _qualmeas –(Q _qualmin +Q _{qualminoffset} )-Qoffset _temp

q in the above two formulas _rxlevmeas For the measured cell RX level value, i.e. RSRP (Reference Signal Receiving Power, reference signal received power); q (Q) _qualmeas For the measured cell quality value, i.e. RSRQ (Reference Signal Receiving Quality, reference signal received quality); upper partOther parameters in both formulas are either configured by the system, e.g. by system information, or use default values, e.g. 0.

As an embodiment, under the assumption that L2 relay is not used, the acceptable cell is a cell that satisfies the first quality criterion and the condition to enter the camped on any cell state includes that no suitable cell is found and an acceptable cell is found.

As a sub-embodiment of this embodiment, the phrase unused L2 relay includes not supporting L2U 2N relay.

As a sub-embodiment of this embodiment, the phrase not using L2 relaying includes not finding a suitable relay.

As a sub-embodiment of this embodiment, the phrase not using L2 relay includes not finding an acceptable L2U 2N relay nor finding a suitable relay.

As a sub-embodiment of this embodiment, in case of using L2 relay, the acceptable cell of the first relay is considered as an acceptable cell of the first node, and the first relay is in a camping on any cell state.

As a sub-embodiment of this embodiment, in case of using L2 relay, the first node determines acceptable cells according to a second criterion comprising: the first relay is an acceptable L2 relay and no suitable cell is found.

As a sub-embodiment of this embodiment, in case of using L2 relay, the first node determines acceptable cells according to a second criterion, which is or comprises: no suitable cell is found, only the camping cell is found to be a relay of the acceptable cell of the first node.

As a sub-embodiment of this embodiment, in case of using L2 relay, the first node determines acceptable cells according to a second criterion, which is or comprises: no suitable cell is found and only the camping cell is found to support only the relay of the first service set.

As a sub-embodiment of this embodiment, in case of using L2 relay, the first node determines acceptable cells according to a second criterion, which is a criterion other than the first quality criterion.

As an embodiment, on the assumption that L2 relay is not used, an acceptable cell is a cell that meets the first quality criterion, i.e. an acceptable cell needs to meet the first quality criterion; in case of using L2 relay, the acceptable cell also needs to meet the first quality criterion for the first node being an L2U 2N remote node.

As an embodiment, in the second state, the RRC connection is established through the first relay, or the RRC connection is directly established without going through the relay.

As an embodiment, the first node performs a cell reselection evaluation in response to at least one condition of a first set of cell reselection conditions being met;

wherein the first set of cell reselection conditions comprises: and according to the internal trigger of the first node, when the information for cell reselection evaluation on a BCCH channel is changed, when the first relay fails, when the channel quality of a first wireless link is lower than a first threshold value, the first wireless link is in the first state, wherein the first wireless link is a wireless link between the first node and the first relay.

As an embodiment, the first node transitions from the first state to a camped-on state in response to performing cell selection or cell reselection and finding a suitable cell.

As an embodiment, the first node transitions from the first state to a normal resident state in response to performing relay selection and finding an appropriate relay.

As an embodiment, the second set of conditions includes leaving or needing to leave an idle or inactive mode.

As an embodiment, the second set of conditions includes a need to enter a connected mode.

As an embodiment, the second set of conditions includes receiving a NAS layer indication that a connected mode needs to be entered.

As an embodiment, the second set of conditions includes receiving a paging sum, or paging message, requiring or triggering entry into a connected mode.

As an embodiment, the second set of conditions includes a need to establish an RRC connection through L2U 2N relay.

As one embodiment, the second set of conditions includes receiving a system notification.

As an embodiment, the second set of conditions includes receiving a Short Message (Short Message).

As an embodiment, the second condition set includes receiving system information, and needs to receive or is interested in receiving MBS services.

As one embodiment, the second set of conditions includes a need to perform RNA updates.

As one embodiment, the second set of conditions includes expiration of a first timer.

As an embodiment, the second set of conditions includes a need to register a PLMN.

As an embodiment, the second set of conditions includes a need to update the tracking area.

As an embodiment, the second set of conditions includes a need to register a SNPN.

As an embodiment, the second set of conditions includes a need to initiate a traffic and/or PDU session.

As an embodiment, the first condition set includes: suitable relays are found and no suitable cells are found.

As a sub-embodiment of this embodiment, the suitable relay found is an L2U 2N relay UE.

As a sub-embodiment of this embodiment, the suitable relay found is the first relay.

As a sub-embodiment of this embodiment, the PLMN of the serving cell of the first relay is not the PLMN selected by the first node nor the PLMN registered by the first node nor the equivalent PLMN list belonging to the first node.

As a sub-embodiment of this embodiment, the PLMN of the cell in which the first relay resides is not the PLMN selected by the first node nor the PLMN registered by the first node nor the equivalent PLMN list of the first node.

As a sub-embodiment of this embodiment, the PLMN of the primary cell of the first relay is not the PLMN selected by the first node nor the PLMN registered by the first node nor the equivalent PLMN list belonging to the first node.

As a sub-embodiment of this embodiment, the serving cell of the first relay supports only the first set of services to the first node.

As a sub-embodiment of this embodiment, the serving cell of the first relay is an acceptable cell for the first node instead of a suitable cell.

As a sub-embodiment of this embodiment, the first set of conditions includes: a second relay is not found, which is a suitable relay, and the PLMN of the serving cell of the second relay is the PLMN selected by the first node or is the PLMN registered by the first node or belongs to an equivalent PLMN list of the first node.

As a sub-embodiment of this embodiment, the first set of conditions includes: no second relay is found, which is a suitable relay, and its serving cell is a suitable cell for the first node.

As a sub-embodiment of this embodiment, the first set of conditions includes: a second relay is not found, the second relay being a suitable relay, a serving cell of the second relay supporting traffic to the first node outside the first traffic set.

As a sub-embodiment of this embodiment, the first set of conditions includes: no second relay is found, which is a suitable relay, and the PLMN of the serving cell of the second relay is a suitable PLMN.

As an embodiment, the first condition set includes: an acceptable relay is found and no suitable relay and no suitable cell is found.

As a sub-embodiment of this embodiment, the acceptable relay found is an L2U 2N relay UE.

As a sub-embodiment of this embodiment, the acceptable relay found is the first relay.

As a sub-embodiment of this embodiment, the first relay is in a normally resident state.

As a sub-embodiment of this embodiment, the first relay is in a connected mode.

As a sub-embodiment of this embodiment, the serving cell of the first relay is a suitable cell of the first relay.

As an embodiment, the first service set comprises only emergency services (emergency call).

As an embodiment, the first set of services comprises only emergency services and alert services.

As an embodiment, the unicast traffic of the first traffic set is traffic that can only be received in RRC connected state.

As an embodiment, the unicast traffic of the first traffic set is traffic that can only be received in the connected mode.

As an embodiment, the meaning that the phrase that the second state supports only the first service set is: the second state is converted from the first state, not from the normal resident state.

As an embodiment, the meaning that the phrase that the second state supports only the first service set is: when the first node wants to initiate unicast services supported by the first service set, the first node needs to be switched from the first state to the second state.

As an embodiment, the first node uses only the first relay in the first state and does not use other L2U 2N relay UEs.

As a sub-embodiment of this embodiment, the indirect path of the first node comprises only the first relay.

As an embodiment, the third condition set includes: suitable cells were found.

As an embodiment, the third condition set includes: suitable relays were found.

As a sub-embodiment of this embodiment, the first set of conditions includes that acceptable relays are found and no suitable cells are found; the first set of conditions does not include finding a suitable relay and not finding a suitable cell.

As an embodiment, whether the first set of conditions includes finding a suitable relay is related to whether the third set of conditions includes finding a suitable relay.

As an embodiment, the condition that a suitable relay is found belongs to either the first condition set or the third condition set.

As one embodiment, the intersection of the first set of conditions and the third set of conditions is an empty set.

As one embodiment, the intersection of the second set of conditions with the third set of conditions is an empty set.

As one embodiment, the intersection of the first set of conditions and the second set of conditions is an empty set.

As an embodiment, the PLMN of the serving cell of the first relay is not the PLMN selected by the first node nor the PLMN registered by the first node nor the equivalent PLMN list belonging to the first node.

As a sub-embodiment of this embodiment, the first relay is in a connected mode.

As a sub-embodiment of this embodiment, the first relay is in a camped on any cell state.

As a sub-embodiment of this embodiment, the PLMN of the serving cell of the first relay is the PLMN indicated by the first relay in the discovery message.

As a sub-embodiment of this embodiment, the PLMN of the serving cell of the first relay is any PLMN of the serving cell of the first relay.

As a sub-embodiment of this embodiment, the PLMN of the serving cell of the first relay is any one of PLMNs supported by the first relay of the serving cell of the first relay.

As an embodiment, the first state is a camped on any cell state (camped on any cell), the first set of conditions comprises that a suitable relay is found and that a serving cell of the found suitable relay only supports the first set of traffic.

As a sub-embodiment of this embodiment, the first relay is in a connected mode.

As an embodiment, the first state is a camped on any cell state, and the first set of conditions includes finding an acceptable relay.

As a sub-embodiment of this embodiment, the first set of conditions does not include finding a suitable relay.

As a sub-embodiment of this embodiment, the first set of conditions includes that no suitable relay has been found.

As a sub-embodiment of this embodiment, the first set of conditions comprises that no suitable cell has been found.

As an embodiment, the third set of conditions includes a condition that a suitable relay is found.

As an embodiment, in the second state, the RRC connection is established through the first relay; the second state is a state other than a connected mode in which the RRC connection is not directly established through the middle and then.

As an embodiment, the second state is a connected mode.

As an embodiment, the third condition set includes: the first relay indicates that a serving cell of the first relay is a suitable cell of the first node.

As an embodiment, the third condition set includes: the first relay indicates that the PLMN of the serving cell of the first relay is either the PLMN selected by the first node or the PLMN registered by the first node or an equivalent PLMN list belonging to the first node.

As an embodiment, the PLMN of the serving cell of the first relay is a PLMN indicated by the first relay in the discovery message.

As an embodiment, the PLMN of the serving cell of the first relay is any PLMN of the serving cell of the first relay.

As an embodiment, the PLMN of the serving cell of the first relay is any one of PLMNs supported by the first relay of the serving cell of the first relay.

As one embodiment, the first relay is in a normal resident state.

As an embodiment, the first relay is in a connected mode.

As an embodiment, the first relay is in a camped on any cell state.

As an embodiment, the first node leaves the first state in response to performing relay selection and discovering a suitable relay and the discovered PLMN of the serving cell of the suitable relay being either the PLMN selected by the first node or the PLMN registered by the first node or belonging to an equivalent PLMN list of the first node.

For one embodiment, the phrase exiting the first state comprises: transition from the first state to the normal park state.

For one embodiment, the phrase exiting the first state comprises: transitioning from the first state to a fifth state; the fifth state may be directly transitioned to the connected mode in response to a sixth set of conditions being satisfied.

As a sub-embodiment of this embodiment, the fifth state is a normal stay state by relay.

As a sub-embodiment of this embodiment, the fifth state is a stay state by relay.

As a sub-embodiment of this embodiment, the name of the fifth state includes a relay.

As a sub-embodiment of this embodiment, the name of the fifth state includes residency.

As a sub-embodiment of this embodiment, the fifth state is non-direct resident.

As a sub-embodiment of this embodiment, the sixth set of conditions includes a condition that a suitable relay is found.

For one embodiment, the phrase exiting the first state comprises: transitioning from the first state to a fifth state; the fifth state is transitionable to the second state in response to the second set of conditions being satisfied.

As a sub-embodiment of this embodiment, the fifth state is non-direct resident.

As a sub-embodiment of this embodiment, the sentence in response to the second set of conditions being satisfied, the fifth state being directly transitionable to the second state has the meaning of: when any of the second set of conditions is met, the fifth state transitions to the second state without going through other intermediate states or intermediate processes.

As an embodiment, the first node performs a cell selection reselection evaluation and does not find a cell meeting a first quality criterion before the behavior enters the first state;

As a sub-embodiment of this embodiment, the phrase performing a cell selection reselection evaluation and not finding a cell that meets the first quality criterion comprises: no suitable cells were found.

As a sub-embodiment of this embodiment, the phrase performing a cell selection reselection evaluation and not finding a cell that meets the first quality criterion comprises: no acceptable cells were found.

As a sub-embodiment of this embodiment, the phrase unused relays includes not supporting relays.

As a sub-embodiment of this embodiment, the phrase unused relays includes not supporting L2U 2N relays.

As a sub-embodiment of this embodiment, the phrase unused relays includes not finding a suitable relay.

As a sub-embodiment of this embodiment, the phrase unused relays includes relays that are not found acceptable.

As a sub-embodiment of this embodiment, sentences are given on the assumption that no relay is used: an acceptable cell is a cell that meets the first quality criterion and the condition to enter the camped on any cell state includes that no suitable cell is found to be an acceptable cell, the meaning of the first node entering the any cell selection state includes: under the assumption that no relay is used: the first node should enter an arbitrary cell selection state.

As a sub-embodiment of this embodiment, the acceptable cell need not be meeting the first quality criterion in case of using L2U 2N relay.

As one embodiment, the first node determines the first cell as an acceptable cell according to a second criterion; the first cell does not meet a first quality criterion;

As a sub-embodiment of this embodiment, the first quality criterion is an S criterion.

As a sub-embodiment of this embodiment, the first relay is in a connected mode.

As a sub-embodiment of this embodiment, the first node does not find a suitable cell.

As a sub-embodiment of this embodiment, the first node does not find a suitable relay.

As a sub-embodiment of this embodiment, the first relay is a suitable relay.

As a sub-embodiment of this embodiment, the first relay is an acceptable relay.

As an embodiment, the first node performs cell selection and relay selection and does not find a PLMN of a suitable cell nor a serving cell, either the PLMN selected by the first node or the PLMN registered by the first node or a relay belonging to an equivalent PLMN list of the first node; determining that a serving cell of the first relay is an acceptable cell;

As a sub-embodiment of this embodiment, the sentence that neither a suitable cell nor a PLMN of a serving cell is found is either the PLMN selected by the first node or the PLMN registered by the first node or a relay belonging to an equivalent PLMN list of the first node; determining that the serving cell of the first relay is an acceptable cell includes: no relays other than the first relay are found.

As a sub-embodiment of this embodiment, the sentence that neither a suitable cell nor a PLMN of a serving cell is found is either the PLMN selected by the first node or the PLMN registered by the first node or a relay belonging to an equivalent PLMN list of the first node; determining that the serving cell of the first relay is an acceptable cell includes: any of the discovered relays is not a PLMN selected by the first node nor a relay of the PLMN registered by the first node nor an equivalent PLMN list belonging to the first node.

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

As an embodiment, the first node transitions from an RRC state other than an RRC idle state to an RRC idle state when entering the first state.

As an embodiment, the first relay indicates a non-serving PLMN.

As a sub-embodiment of this embodiment, the non-serving PLMN is not the PLMN selected by the first relay.

As a sub-embodiment of this embodiment, the non-serving PLMN is not a PLMN registered by the first relay.

As a sub-embodiment of this embodiment, the non-serving PLMN is not one of the equivalent PLMN list of the first relay.

As a sub-embodiment of this embodiment, the first relay indicates the non-serving PLMN via a discovery message.

As a sub-embodiment of this embodiment, the non-serving PLMN is a PLMN selected by the first node.

As a sub-embodiment of this embodiment, the non-serving PLMN is a PLMN registered by the first node.

As a sub-embodiment of this embodiment, the non-serving PLMN is one of a list of PLMNs equivalent to the first node.

As a sub-embodiment of this embodiment, the first state is a normal park state.

As a sub-embodiment of this embodiment, the first node enters a normal resident state.

As a sub-embodiment of this embodiment, the first node enters a normal resident state from the first state.

As a sub-embodiment of this embodiment, the first node enters a normal stay state from the first state as a response to receiving the non-serving PLMN.

As an embodiment, the first condition set includes: the non-serving PLMN indicated by the first relay is a PLMN registered by the first node or a selected PLMN or an equivalent PLMN list belonging to the first node.

Example 2

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

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

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

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

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

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

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

As one embodiment, the second node in this application is the gNB203.

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

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

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

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

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

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

As an embodiment, the UE201 supports L2 relay transmission.

As an embodiment, the UE241 supports L2 relay transmission.

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

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

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, the control plane may also include an adaptation sublayer AP308, and the user plane may also include an adaptation sublayer AP358, where the introduction of the adaptation layer may facilitate multiplexing and/or distinguishing data from multiple source UEs by lower layers, such as the MAC layer, e.g., the RLC layer, and may or may not include an adaptation sublayer for UE-to-UE communications involving relay services. In addition, the adaptation sublayers AP308 and AP358 may also be sublayers within PDCP304 and PDCP354, respectively. The RRC306 may be used to handle RRC signaling of the Uu interface and signaling of the PC5 interface, but logically, the RRC entity handling RRC signaling of the Uu interface and the RRC signaling handling PC5 interface may be separate entities; similar processing may also be applicable to PDCP, RLC, MAC and PHY entities. In the non-RRC connected state, either some messages are received, or some flows are in progress, either the AP308 or AP358 sublayers may not be used, or this may be considered transparent to the AP308 or AP 358. The adaptation sublayers AP308 and AP358 are either RLC between PDCP and RLC for associating RLC of the PC5 interface with RLC of the Uu interface or N:1,1: N multiplexing or mapping or association for RLC entities or channels or bearers or RLC SDUs.

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 radio protocol architecture in fig. 3 is applicable to the third node in the present application.

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

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

As an embodiment, the first discovery message in the present application is generated in RRC306 or PC5-S307.

Example 4

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

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

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

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

In a transmission from the second communication device 410 to the first communication device 450, each receiver 454 receives a signal at the first communication device 450 through its respective antenna 452. Each receiver 454 recovers information modulated onto a radio frequency carrier and converts the radio frequency stream into a baseband multicarrier symbol stream that is provided to a receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 implement various signal processing functions for the L1 layer. A multi-antenna receive processor 458 performs receive analog precoding/beamforming operations on the baseband multi-carrier symbol stream from the receiver 454. The receive processor 456 converts the baseband multicarrier symbol stream after receiving the analog precoding/beamforming operation from the time domain to the frequency domain using a Fast Fourier Transform (FFT). In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receive processor 456, wherein the reference signal is to be used for channel estimation, and the data signal is subjected to multi-antenna detection in the multi-antenna receive processor 458 to recover any spatial stream destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered in a receive processor 456 and soft decisions are generated. The receive processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals that were transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller/processor 459. The controller/processor 459 implements the functions of the L2 layer. The controller/processor 459 may be associated with a memory 460 that stores program codes and data. Memory 460 may be referred to as a computer-readable medium. In the transmission from the second communication device 410 to the second 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: at least one processor and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus of the first communication device 450 to at least: entering a first state in response to the first set of conditions being satisfied; executing a first set of operations in the first state; transitioning from the first state to a second state in response to any condition in the second set of conditions being met; transitioning from the first state to a normally resident state in response to any of a third set of conditions being met; wherein the first set of operations includes: monitoring a first system information set through the first relay, and executing reselection evaluation; the first condition set includes at least: a suitable relay is found and no suitable cell is found, or the first set of conditions comprises at least: an acceptable relay is found and no suitable cell is found; the second state only supports the first service set; the unicast traffic in the first traffic set comprises only emergency traffic; in the second state, an RRC connection is established; the third set of conditions includes at least the condition that a suitable cell has been found.

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: entering a first state in response to the first set of conditions being satisfied; executing a first set of operations in the first state; transitioning from the first state to a second state in response to any condition in the second set of conditions being met; transitioning from the first state to a normally resident state in response to any of a third set of conditions being met; wherein the first set of operations includes: monitoring a first system information set through the first relay, and executing reselection evaluation; the first condition set includes at least: a suitable relay is found and no suitable cell is found, or the first set of conditions comprises at least: an acceptable relay is found and no suitable cell is found; the second state only supports the first service set; the unicast traffic in the first traffic set comprises only emergency traffic; in the second state, an RRC connection is established; the third set of conditions includes at least the condition that a suitable cell has been found.

As an embodiment, the first communication device 450 corresponds to a first 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 first communication device 450 is a relay.

As an example, a receiver 456 (including an antenna 460), a receive processor 452 and a controller/processor 490 are used for receiving the first signaling in the present application.

As an example, a receiver 456 (including an antenna 460), a receive processor 452 and a controller/processor 490 are used for receiving the first discovery message in the present application.

As an example, a receiver 456 (including an antenna 460), a receive processor 452 and a controller/processor 490 are used for receiving the first signal in the present application.

As an example, a transmitter 456 (including an antenna 460), a transmit processor 455 and a controller/processor 490 are used to transmit the first signaling in this application.

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

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

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 is a cell or a base station, U03 corresponds to a first relay of the present application, and it is specifically illustrated that the order in this example does not limit the order of signal transmission and the order of implementation in the present application, where steps in F51 and F52 are optional.

For the followingFirst node U01Receiving a first signal in step S5101; enter a first state in step S5102; receiving a first signaling in step S5103; in step S5104, the second state is switched to the connection mode.

For the followingThird node U03Transmitting a first signal in step S5301; the first signaling is transmitted in step S5302.

In embodiment 5, the first node U01 enters a first state in response to the first set of conditions being satisfied; executing a first set of operations in the first state; transitioning from the first state to a second state in response to any condition in the second set of conditions being met; transitioning from the first state to a normally resident state in response to any of a third set of conditions being met;

Wherein the first set of operations includes: monitoring a first system information set through the first relay, and executing reselection evaluation; the first condition set includes at least: a suitable relay is found and no suitable cell is found, or the first set of conditions comprises at least: an acceptable relay is found and no suitable cell is found; the second state only supports the first service set; the unicast traffic in the first traffic set comprises only emergency traffic; in the second state, an RRC connection is established; the third set of conditions includes at least the condition that a suitable cell has been found.

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

As an embodiment, the first node U01 is an L2U 2N remote UE.

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

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

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

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

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

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

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

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

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

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

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

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

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

As a sub-embodiment of this embodiment, the third node U03 is in an RRC connected state.

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

As a sub-embodiment of this embodiment, the third node U03 is in a non-RRC connected state.

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

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

As an embodiment, the first node U01 and the third node U03 have the same serving cell.

As a sub-embodiment of this embodiment, both the third node U03 and the first node U01 are in a non-RRC connected state.

As an embodiment, the second node U02 is a cell in which the third node U03 resides.

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

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

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

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

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

As an embodiment, the first node U01 selects the third node U03 to connect to the network, where the cell in which the first node U01 resides is not the cell with the best signal quality of the first node U01.

As a sub-embodiment of this embodiment, the phrase connecting to the network includes receiving a system message and/or receiving a paging message and/or establishing an RRC connection.

As a sub-embodiment of this embodiment, the first node U01 resides in the cell in which the third node U03 resides.

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

As an embodiment, there is no RRC connection between the first node U01 and the third node U03.

As an embodiment, the first node U01 is in an RRC connected state in the second state.

As an embodiment, the first node U01 is in a non-RRC connected state in the first state.

As an embodiment, the first node U01 is in rrc_idle state.

As an embodiment, the first node U01 is in rrc_inactive state.

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

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

As an embodiment, the third node U03 is in an RRC connected state.

As an embodiment, the third node U03 is in a non-RRC connected state.

As an embodiment, the third node U03 is in rrc_idle state.

As an embodiment, the third node U03 is in rrc_inactive state.

As an embodiment, the first node U01 has an RRC connection between the connected mode and the second node U02.

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

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

As a sub-embodiment of this embodiment, the third node U03 forwards the system message sent by the second node U02.

As an embodiment, the first node U01 communicates with the second node U02 via a direct path before entering the first state.

As an embodiment, the first node U01 establishes a PC5 connection or establishes a direct link or uses a sidelink communication with the second node U02 before entering the first state.

As a sub-embodiment of this embodiment, the PC5 connection is a relay-related PC5 connection.

As an embodiment, the first node U01 communicates with the third node U03 through a sidelink.

As an embodiment, the first node U01 establishes a direct link with the third node U03 for L2 relay.

As an embodiment, the meaning of the first node U01 connected to the network through the third node U03 includes: the first node U01 receives system information from the network through the third node U03.

As an embodiment, the meaning of the first node U01 connected to the network through the third node U03 includes: the first node U01 listens to the first set of system information through the third node U03.

As an embodiment, the meaning of the first node U01 connected to the network through the third node U03 includes: the first node U01 establishes an RRC connection with the network through the third node U03.

As an embodiment, the meaning of the first node U01 connected to the network through the third node U03 includes: the first node U01 initiates a request or attempt to establish an RRC connection through the third node U03.

As an embodiment, the first node U01 receives a first signal on a sidelink before the behavior transitions from the first state to the second state, the first signal being used to indicate a first cell, and determines that the first cell is a camping cell of the first node U01;

wherein, when the third node U03 is in an RRC connected state, the first cell is a PCell of the third node U03, and when the third node U03 is in a non-RRC connected state, the first cell is a serving cell of the third node U03.

As a sub-embodiment of this embodiment, the first cell is the second node U02 or belongs to the second node U02.

As a sub-embodiment of this embodiment, the first signal comprises a discovery message.

As a sub-embodiment of this embodiment, the first signal comprises a first discovery message.

As a sub-embodiment of this embodiment, the first signal comprises an NCI, the NCI indicating the first cell.

As a sub-embodiment of this embodiment, the first cell is a camping cell of the third node U03.

As a sub-embodiment of this embodiment, the first cell is a suitable cell of the third node U03.

As a sub-embodiment of this embodiment, the first cell is a connected cell of the third node U03.

As a sub-embodiment of this embodiment, the first signal comprises an identity of the first cell.

As a sub-embodiment of this embodiment, the first node U01 resides in the first cell.

As a sub-embodiment of this embodiment, the third node is either in RRC connected or non-RRC connected state.

As a sub-embodiment of this embodiment, when the third node U03 is in a non-RRC connected state, the third node U03 is connected to only one serving cell.

As a sub-embodiment of this embodiment, the first cell is a suitable cell of the first node U01.

As a sub-embodiment of this embodiment, the quality of the first cell determined by the first node U01 through measurement or cell selection evaluation or search does not satisfy the S criterion (criterion S).

As a sub-embodiment of this embodiment, the quality of the first cell determined by the first node U01 by measurement or cell selection evaluation or search does not meet a first quality criterion.

As a sub-embodiment of this embodiment, the first signal comprises a discovery message of mode a or a discovery message of mode B.

As a sub-embodiment of this embodiment, the first cell is an acceptable cell.

As a sub-embodiment of this embodiment, the first cell is the second node U02 or a cell managed by the second node U02.

As an embodiment, the first signal indicates a PLMN of a first cell, where the PLMN of the first cell is not the PLMN selected by the first node U01 nor the PLMN registered by the first node U01 nor the equivalent PLMN list of the first node U01.

As an embodiment, in step S5102, the first node U01 enters the first state.

As a sub-embodiment of this embodiment, the first state is a camped on any cell state.

As a sub-embodiment of this embodiment, the first state is not a camped on any cell state.

As an embodiment, the first signal is used to determine that at least one condition of the first set of conditions is met.

As an embodiment, the first signal is used to determine that the first set of conditions is met.

As an embodiment, the first signal is transmitted over a sidelink.

As an embodiment, the first signal is used to instruct the third node U03 to provide only traffic in the first set of traffic.

As an embodiment, the first signal is used to instruct the second node U02 to provide only the traffic in the first set of traffic.

As an embodiment, the first signal is used to instruct the cell of the third node U03 to provide only the traffic in the first set of traffic.

As an embodiment, the first node U01 measures the first signal to obtain an SD-RSRP, which meets the quality requirements of the L2U 2N relay selection.

As a sub-embodiment of this embodiment, there is no PC5 connection between the first node U01 and the third node U03.

As a sub-embodiment of this embodiment, there is no direct link between the first node U01 and the third node U03.

As a sub-embodiment of this embodiment, the first node U01 establishes a PC5 connection or a direct link for L2U 2N relay with the third node U03 after receiving the first signal in step S5101 and before step S5102.

As an embodiment, in F51, the first signaling is sent by the third node U03 to the first node U01.

As a sub-embodiment of this embodiment, the generator of the first signaling is the third node U03.

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

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

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

As a sub-embodiment of this embodiment, the first signaling is or includes PC5-MAC signaling.

As a sub-embodiment of this embodiment, the first signaling is or includes PC5-PHY signaling.

As a sub-embodiment of this embodiment, the physical channel occupied by the first signaling is or includes a PSCCH (physical sidelink control channel ).

As a sub-embodiment of this embodiment, the physical channel occupied by the first signaling is or includes a PSSCH (physical sidelink shared channel ).

As a sub-embodiment of this embodiment, the first signaling indicates that a Radio Link Failure (RLF) has occurred at the third node U03.

As a sub-embodiment of this embodiment, the first signaling indicates that the Radio Link Failure (RLF) of the Uu interface has occurred for the third node U03.

As a sub-embodiment of this embodiment, the first signaling indicates that the third node U03 has undergone a cell change.

As a sub-embodiment of this embodiment, the first signaling indicates that the third node U03 has switched.

As a sub-embodiment of this embodiment, the first signaling indicates to stop the L2U 2N relay service.

As a sub-embodiment of this embodiment, the first signaling indicates to release the direct link between the first node U01 and the third node U03.

As a sub-embodiment of this embodiment, the first signaling indicates that a radio link failure or error of the PC5 interface has occurred.

As a sub-embodiment of this embodiment, the first signaling indicates that it is blocked by the cell to which the third node U03 is connected.

As a sub-embodiment of this embodiment, the first signalling indication is blocked by the second node U02.

As a sub-embodiment of this embodiment, the first signaling indicates that the BCCH of the cell to which the third node U03 is connected indicates a cell selection procedure change.

As a sub-embodiment of this embodiment, the first signaling indicates that the BCCH of the cell to which the third node U03 is connected indicates a relay selection procedure change.

As a sub-embodiment of this embodiment, the first signaling indicates the cell to which the third node U03 is connected, i.e. the BCCH of the second node U02 indicates a cell selection procedure change.

As a sub-embodiment of this embodiment, the first signaling indicates that the cell to which the third node U03 is connected, i.e. the BCCH of the second node U02, indicates a relay selection procedure change.

As a sub-embodiment of this embodiment, the first signaling comprises a discovery message, the first signaling indicating that relay service is about to be stopped.

As a sub-embodiment of this embodiment, the first signaling indicates that QoS is limited.

As a sub-embodiment of this embodiment, the radio channel quality determined by measuring the physical layer signal occupied by the first signaling does not meet the L2U 2N relay selection requirement.

As a sub-embodiment of this embodiment, the radio channel quality determined by measuring the physical layer resources occupied by the first signaling does not meet the L2U 2N relay selection requirement.

As a sub-embodiment of this embodiment, the first signaling indicates that the PLMN of the serving cell of the third node U03 has changed.

As a sub-embodiment of this embodiment, the first signaling instructs the third node U03 to provide only the traffic in the first traffic set.

As an embodiment, the first signaling is used to determine that the first set of conditions is satisfied.

As an embodiment, the first signaling is used to determine to enter the first state from a normal stay state via relay selection.

As an embodiment, the first signaling is used to determine that the first relay is no longer a suitable relay.

As one embodiment, the first signaling is used to determine that the first relay is an acceptable relay.

As an embodiment, the first signaling is used to determine that the fourth set of conditions is met.

As an embodiment, the first signaling is used to determine that the second set of conditions is satisfied.

As an embodiment, the first node U01 starts to switch to the connection mode in step S5104.

As an embodiment, the first node U01 transitions to the connection mode in step S5104.

As an embodiment, the first node U01 successfully switches to the connection mode in step S5104.

As an embodiment, when the first node U01 fails to successfully transition from the second state to the connected mode, the first node U01 enters an arbitrary cell selection state.

As an embodiment, when the first node U01 fails to successfully transition from the second state to the connected mode, the first node U01 enters the first state.

As an embodiment, when the first node U01 fails to successfully transition from the second state to the connected mode, the first node U01 enters the second state.

As an embodiment, when the first node U01 fails to successfully transition from the second state to the connected mode, the first node U01 performs cell selection and/or L2U 2N relay selection.

As an embodiment, the first signal indicates the first set of services.

As a sub-embodiment of this embodiment, the RSC (relay service code) included in the first signal indicates the first traffic set.

As an embodiment, the first signaling indicates the first set of services.

As a sub-embodiment of this embodiment, the RSC (relay service code) included in the first signaling indicates the first traffic set.

As an embodiment, the first signal indicates that ims-emergencypupport is true.

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, U12 is a gNB, and a third node of U13 corresponds to a first relay of the present application, which is specifically described, but the order in this example is not limited to the order of signal transmission and implementation in the present application.

For the followingFirst node U11Transmitting an RRC connection establishment request in step S6101; receiving RRC connection establishment in step S6102; transmitting the RRC connection setup complete in step S6103; receiving a security mode command in step S6104; transmitting the security mode completion in step S6105; receiving an RRC reconfiguration in step S6106; the RRC reconfiguration complete is sent in step S6107.

For the followingSecond node U12Receiving an RRC connection setup request in step S6201; transmitting RRC connection establishment in step S6202; receiving an RRC connection setup complete in step S6203; transmitting a security mode command in step S6204; receiving the security mode complete in step S6205; transmitting an RRC reconfiguration in step S6206; the RRC reconfiguration complete is received in step S6207.

Embodiment 6 shows an RRC connection establishment procedure through the third node U13, wherein RRC connection establishment request, RRC connection establishment complete, security mode command, security mode complete, RRC reconfiguration, and transmission of RRC reconfiguration complete are all completed through relay of the third node U13.

As an embodiment, the security-related signaling procedure for emergency services is different from the security-related signaling procedure for normal services.

As an embodiment, the signaling flow for the emergency services regarding the security mode is omitted.

As an embodiment, the signaling flow related to RRC reconfiguration for emergency services is different from the signaling flow related to RRC reconfiguration for normal services.

As an embodiment, the step set S6001 includes one or more signaling procedures, and in the step set 6001, the first node U11 and the second node U12 perform a discovery procedure.

As an embodiment, step set S6002 includes one or more signaling procedures, and in step set S6002, the first node U11 and the second node U12 establish a PC5-RRC connection using an NR V2X procedure.

As an embodiment, the step set S6003 includes one or more signaling procedures, and in step S6003, the second node U12 and the first node U11 perform a relay channel establishment procedure on a Uu interface; the first node U11 establishes an RLC channel for relaying SRB1 to the first node U11 at a PC5 interface according to the configuration of the second node U12, and/or the third node U13 establishes an RLC channel for relaying SRB1 to the first node U11 at a PC5 interface according to the configuration of the second node U12.

As an embodiment, the step set S6004 includes one or more signaling procedures, and in step S6004, the first node U11 establishes SRB2 and/or DRB according to the configuration of the second node U12; the second node U12 establishes an additional RLC channel between the second node U12 and the third node U13 to relay data.

As an embodiment, the RRC connection establishment request is a first RRC message sent by the first node U11 for the RRC connection establishment.

As an embodiment, the RRC connection setup request is one of { RRCSetupRequest, RRCResumeRequest, RRCReestablishmentRequest }.

As an embodiment, the RRC connection setup is one of { RRCSetup, RRCResume, RRCReestablishment }.

As an embodiment, the RRC connection setup complete is one of { RRCSetupComplete, RRCResumeComplete, RRCReestablishmentComplete }.

As an embodiment, the RRC connection establishment request is relayed through the third node U13.

As an embodiment, the RRC connection establishment request is used to request establishment of an RRC connection between the first node U11 and the second node U12 through the third node U13.

As an embodiment, the RRC connection establishment request is transmitted through a default or fixed PC5 RLC bearer configuration.

As an embodiment, if the third node U13 has not yet started to enter the RRC connected state, the third node U13 will establish an RRC connection with the second node U12 during the RRC connection establishment of the first node U11.

As an embodiment, the RRC connection establishment is a response to the RRC connection establishment request.

As one embodiment, the RRC connection establishment is transmitted via a default or fixed PC5 RLC bearer configuration.

As an embodiment, the RRC connection establishment complete is forwarded by the third node U13 to the second node U12 using an SRB1 relay channel on a PC5 interface; the SRB1 relay channel is configured to the third node U13 through a Uu interface; after sending the RRC connection establishment is completed, the first node U11 establishes an RRC connection on the Uu interface.

As an embodiment, the security mode command is used to establish security between the first node U11 and the second node U12.

As one embodiment, the secure mode completion is used to feed back the secure mode command.

As an embodiment, the secure mode command is secure mode command.

As one embodiment, the security mode completion is security modecomplete.

As an embodiment, the RRC reconfiguration is rrcrecon configuration.

As an embodiment, the RRC reconfiguration complete is rrcrecon configuration complete.

As an embodiment, the RRC reconfiguration is used to configure SRB2 between the first node U11 and the second node U12.

As a sub-embodiment of this embodiment, the SRB2 between the first node U11 and the second node U12 is associated with an RLC channel or entity of the PC5 interface between the first node U11 and the third node U13.

As an embodiment, the RRC reconfiguration is used to configure a DRB between the first node U11 and the second node U12.

As a sub-embodiment of this embodiment, the DRB between the first node U11 and the second node U12 is associated with an RLC channel or entity of the PC5 interface between the first node U11 and the third node U13.

As an embodiment, the RRC reconfiguration complete is used to feed back the RRC reconfiguration.

As an embodiment, the reason for the RRC connection establishment is email as an embodiment.

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.

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.

In embodiment 7, the PC5 interface is an interface between the first node and the first relay, and the PC5 interface-related protocol entity { PC5-ADAPT, PC5-RLC, PC5-MAC, PC5-PHY } terminates at the first node and the first relay; 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 and the first relay are both UEs.

As an embodiment, the protocol entity { Uu-ADAPT, uu-RLC, uu-MAC, uu-PHY } of the Uu interface terminates with the first relay and the gNB.

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

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

As an example, in (a), PC5-ADAPT corresponds to AP358 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-ADAPT corresponds to AP308 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 embodiment, the phrase RRC connection is established refers to establishing an RRC connection between the first node and the gNB.

As an embodiment, the phrase RRC connection is established refers to the Uu-RRC entity between the first node and the gNB establishing an RRC connection through a series of signaling procedures.

As an embodiment, the phrase that the RRC connection is established through the first relay means that the Uu-RRC entity between the first node and the gNB establishes the RRC connection through a series of signaling procedures that require forwarding of the first relay.

As a sub-embodiment of one embodiment, the series of signaling flows includes one of RRC connection setup request messages { RRCSetupRequest, RRCResumeRequest, RRCReestablishmentRequest } sent by the first node; the series of signaling flows include one of RRC connection setup messages { RRCSetup, RRCResume, RRCReestablishment } sent by the gNB corresponding to the RRC connection setup request message; the series of signaling procedures includes one of RRC connection setup complete messages { RRCSetupComplete, RRCResumeComplete, RRCReestablishmentComplete } corresponding to RRC connection setup sent by the first node.

As a sub-embodiment of an embodiment, the first node enters the second state after the series of signaling flows is completed.

As a sub-embodiment of an embodiment, the first node initiates the series of signalling flows after entering the second state.

As an embodiment, the gNB in fig. 7 is the second node in the present application.

As an example, one cell of the gNB shown in fig. 7 is a serving cell of the first relay, and the first relay is in a non-RRC connected state.

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

As an example, one cell of the gNB shown in fig. 7 is an acceptable cell of the first relay, which is in a non-RRC connected state.

As an example, one cell of the gNB in fig. 7 is the camping cell of the first relay.

As an example, one cell of the gNB in fig. 7 is a suitable cell of the first relay.

As an example, one cell of the gNB shown in fig. 7 is the cell selected by the first relay.

As an example, one cell of the gNB in fig. 7 is an acceptable cell for the first relay.

As an example, one cell of the gNB in fig. 7 is the camping cell of the first node.

As an example, one cell of the gNB in fig. 7 is a suitable cell of the first node.

As an example, one cell of the gNB shown in fig. 7 is the cell selected by the first node.

As an example, one cell of the gNB in fig. 7 is an acceptable cell for the first node.

As an embodiment, when the first node is in the first state, the first node may receive a system message through the first relay or only through the gNB.

As one example, PC5-ADAPT is used only for specific RBs or messages or data.

As a sub-embodiment of this embodiment, the PC 5-accept layer is not used when the first relay forwards system information.

As an embodiment, the meaning that the phrase RRC connection is not directly established through the middle and then includes that the signaling procedure involved in the establishment procedure of the RRC connection does not require forwarding of the first relay but is directly sent by the first node to the gNB, where the first node needs to establish Uu-RLC, uu-MAC and Uu-PHY and does not need Uu-ADAPT.

As an embodiment, the first relay establishes an RRC connection with the gNB in the connected mode is directly established.

As an embodiment, the first relay establishes an RRC connection with the gNB in the connected mode through the first relay.

Example 8

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

In fig. 8, the dashed lines indicate that the state transition is optional or that the state transition requires going through other intermediate states or procedures such as cell selection and/or L2U 2N relay selection.

As an example, in fig. 8, when all conditions in the first condition set are satisfied and the first node is in a state other than the first state, the first node enters the first state.

As a sub-embodiment of this embodiment, the other states than the first state are or include any cell selection state.

As a sub-embodiment of this embodiment, the other state than the first state is or includes a camped on any cell state.

As a sub-embodiment of this embodiment, the other states than the first state are or include a connected mode.

As a sub-embodiment of this embodiment, the other state than the first state is or includes the second state.

As a sub-embodiment of this embodiment, the other state than the first state is or includes the third state.

As a sub-embodiment of this embodiment, the other state than the first state is or comprises a cell reselection evaluation procedure.

As a sub-embodiment of this embodiment, the first set of conditions comprises finding acceptable cells.

As a sub-embodiment of this embodiment, the first set of conditions includes finding acceptable relays.

In fig. 8, the first node is in the first state, and the first node transitions from the first state to the second state when any one of the second set of conditions is satisfied.

As a sub-embodiment of this embodiment, the second state is a connected mode.

As a sub-embodiment of this embodiment, the second state is not a connected mode.

As a sub-embodiment of this embodiment, the second set of conditions includes leaving or requiring leaving of an idle or inactive mode.

As a sub-embodiment of this embodiment, the second set of conditions comprises leaving or needing to leave the idle mode.

As a sub-embodiment of this embodiment, the second set of conditions includes a need to enter a connected mode.

As a sub-embodiment of this embodiment, the second set of conditions includes receiving a NAS layer indication that a connected mode needs to be entered.

As a sub-embodiment of this embodiment, the second set of conditions includes the receipt of a paging sum, or paging message, requiring or triggering entry into a connected mode.

As a sub-embodiment of this embodiment, the second set of conditions includes the need to establish an RRC connection through the L2U 2N relay.

As a sub-embodiment of this embodiment, the second set of conditions includes receiving a system notification.

As a sub-embodiment of this embodiment, the second set of conditions includes receiving a Short Message (Short Message).

As a sub-embodiment of this embodiment, the second set of conditions includes receiving system information, requiring or interested in receiving MBS services.

As a sub-embodiment of this embodiment, the second set of conditions includes a need to perform RNA updates.

As a sub-embodiment of this embodiment, the second set of conditions includes expiration of a first timer.

As a sub-embodiment of this embodiment, the second set of conditions includes a need to register a PLMN.

As a sub-embodiment of this embodiment, the second set of conditions includes a need to update the tracking area.

As a sub-embodiment of this embodiment, the second set of conditions includes a need to register a SNPN.

As a sub-embodiment of this embodiment, the second set of conditions includes a need to initiate a traffic and/or PDU session.

As a sub-embodiment of this embodiment, the second set of conditions includes a need to initiate traffic in the first set of traffic.

As a sub-embodiment of this embodiment, the second set of conditions includes a need to initiate an emergency call.

As an example, in fig. 8, the first node is in the first state, and when all conditions in the fourth condition set are satisfied, the first node transitions from the first state to the third state in fig. 8.

As a sub-embodiment of this embodiment, the third state in fig. 8 is an arbitrary cell selection state.

As a sub-embodiment of this embodiment, the fourth set of conditions includes at least a condition that reselection evaluation is performed and neither a suitable cell nor a suitable L2 relay is found.

As a sub-embodiment of this embodiment, the fourth set of conditions comprises that no acceptable cells are found.

As a sub-embodiment of this embodiment, the fourth set of conditions includes that no acceptable relay is found.

As a sub-embodiment of this embodiment, the fourth set of conditions includes at least a condition that reselection evaluation is performed and no suitable cell is found.

As a sub-embodiment of this embodiment, the third state in fig. 8 is not an arbitrary cell selection state, and the fourth set of conditions includes at least a condition that a reselection evaluation is performed, and no acceptable L2 relay is found, the reselection evaluation being an L2U 2N relay UE selection and/or reselection evaluation.

As a sub-embodiment of this embodiment, the third state in fig. 8 is any cell selection state, the fourth set of conditions includes at least a condition that a reselection evaluation is performed, and neither an acceptable cell nor an acceptable L2 relay is found, the reselection evaluation including a cell reselection evaluation and/or a cell selection evaluation; the reselection evaluation includes an L2U 2N relay selection and/or reselection evaluation.

As a sub-embodiment of this embodiment, the third state in fig. 8 is an arbitrary cell selection state, and the fourth set of conditions comprises at least one condition that a reselection evaluation is performed, and that neither a suitable nor an acceptable cell is found, the reselection evaluation being a cell reselection evaluation and/or a cell selection evaluation.

As an embodiment, the first state is a camped on any cell state.

As an embodiment, the second state is a connected mode.

As an embodiment, the first state is a second relay state.

As one embodiment, the first state is a second relay resident state.

As an embodiment, the first state is a resident in any relay state.

As an example, the third state in fig. 8 is an arbitrary cell selection state.

As an example, the third state in fig. 8 is an arbitrary relay selection state.

As an example, the third state in fig. 8 is an arbitrary cell and relay selection state.

As an example, the third state in fig. 8 is an arbitrary cell or relay selection state.

As an example, the third state in fig. 8 is one of { any relay selection state, any L2U 2N relay selection state, out of coverage state, any cell and relay selection state, any cell and L2U 2N relay selection state, any access point selection state }.

As an embodiment, the first state is a camped on any cell state and the second state is a connected mode.

As an embodiment, the first state is a camped on any cell state and the third state is any cell selection state.

As an embodiment, the second state is a connected mode and the third state is an arbitrary cell selection state.

As an embodiment, the first state is a camped on any cell state, the second state is a connected mode, and the third state is any cell selection state.

As an embodiment, the first state is entered when the first node leaves the second state, e.g. an RRC connection is released, e.g. a radio link failure occurs, e.g. an indication of the first relay is received, e.g. the first node actively disconnects the RRC connection, the first node performs cell selection and an acceptable cell is found.

As an embodiment, the first state is entered when the first node leaves the second state, e.g. an RRC connection is released, e.g. a radio link failure occurs, e.g. an indication of the first relay is received, e.g. the first node actively disconnects the RRC connection, the first node performs L2U 2N relay selection and an acceptable L2U 2N relay is found.

As an embodiment, the first state is entered when the first node leaves the second state, e.g. an RRC connection is released, e.g. a radio link failure occurs, e.g. an indication of the first relay is received, e.g. the first node actively disconnects the RRC connection, the first node performs cell selection and L2U2N relay selection and finds an acceptable cell and/or finds an acceptable L2U2N relay.

As an embodiment, when the first node leaves the second state, e.g. the RRC connection is released, e.g. a radio link failure occurs, e.g. an indication of the first relay is received, e.g. the first node actively disconnects the RRC connection, the first node performs cell selection and L2U2N relay selection and finds an acceptable cell and/or finds an acceptable L2U2N relay, the first state is entered and is directly connected to the network without relaying.

As a sub-embodiment of this embodiment, the first node preferably uses a direct path to connect to the network when the first node performs cell selection and L2U2N relay selection and finds an acceptable cell and/or finds an acceptable L2U2N relay.

As an embodiment, the first node performs a cell selection reselection evaluation and does not find a cell meeting a first quality criterion before entering the first state; wherein the first state is an arbitrary cell selection state; under the assumption that L2 relay is not used: an acceptable cell is a cell that meets the first quality criterion and the condition to enter the camped on any cell state includes that an acceptable cell is found, the first node enters the any cell selection state.

As a sub-embodiment of this embodiment, the act of performing a cell selection reselection evaluation is or includes cell selection.

As a sub-embodiment of this embodiment, the act of performing a cell selection reselection evaluation is or includes a cell reselection.

As a sub-embodiment of this embodiment, the acceptable cell need not meet the first quality criterion when the first node causes a first relay; the first relay is an L2 relay.

As a sub-embodiment of this embodiment, when the first node uses a first relay, the acceptable cell needs to meet the first quality criterion, the first state being a camped on any cell state; the first set of conditions does not include the condition that acceptable cells are found; the first relay is an L2 relay.

As a sub-embodiment of this embodiment, the first node enters the arbitrary cell selection state on the assumption that L2 relay is not used.

As one embodiment, the first node receives a first signal on a sidelink prior to the transition of the behavior from the first state to the second state, the first signal being used to indicate a first cell, the first cell being determined to be an acceptable cell for the first node; wherein the first cell is a PCell of the first relay when the first relay is in an RRC connected state, and is a serving cell of the first relay when the first relay is in a non-RRC connected state.

As a sub-embodiment of this embodiment, the first cell is determined to be an acceptable cell, the quality of the first cell does not meet the first quality criterion, which is the S criterion.

As a sub-embodiment of this embodiment, the first cell is considered to be an acceptable cell for the first node.

As a sub-embodiment of this embodiment, the first cell is not considered to be a suitable cell for the first node.

As a sub-embodiment of this embodiment, the first cell is considered to be an acceptable relay cell for the first node.

As a sub-embodiment of this embodiment, the first cell is considered to be an L2U 2N relay cell acceptable to the first node.

As one embodiment, the first node determines the first cell as an acceptable cell according to a second criterion; the first cell does not meet a first quality criterion; wherein an acceptable cell is a cell that meets the first quality criterion under the assumption that L2 relay is not used.

As a sub-embodiment of this embodiment, the second criterion does not comprise the first quality criterion.

As a sub-embodiment of this embodiment, it is also possible that the second criterion is not fulfilled by the first quality criterion.

As a sub-embodiment of this embodiment, the second criterion must be met when performing cell selection in order to meet the first quality criterion; when performing L2U 2N relay selection, meeting the first quality criterion is not a requirement for meeting the second criterion.

As a sub-embodiment of this embodiment, the second criterion comprises: the first relay is a suitable L2 relay.

As a sub-embodiment of this embodiment, the second criterion comprises: the first relay is an acceptable L2 relay.

As a sub-embodiment of this embodiment, the second criterion comprises: the first cell is a suitable cell for the first relay.

As a sub-embodiment of this embodiment, the second criterion comprises: the first cell is not blocked.

As a sub-embodiment of this embodiment, the second criterion comprises: the first cell does not belong to the first node selected or registered or equivalent PLMN.

As a sub-embodiment of this embodiment, the second criterion comprises: no suitable cells were found.

As a sub-embodiment of this embodiment, the second criterion comprises: no suitable relay was found.

As a sub-embodiment of this embodiment, the condition to enter the first state comprises finding an acceptable cell.

As a sub-embodiment of this embodiment, the first set of conditions does not comprise the condition that the discovered cell meets the first quality criterion.

As a sub-embodiment of this embodiment, the acceptable cells include acceptable relay cells.

As a sub-embodiment of this embodiment, the acceptable cells do not include acceptable relay cells.

As a sub-embodiment of this embodiment, the acceptable cells do not include suitable relay cells.

As an embodiment, the first node performs a cell selection reselection evaluation and does not find a cell meeting a first quality criterion before the behavior enters the first state; wherein an acceptable cell is a cell that meets the first quality criterion.

As a sub-embodiment of this embodiment, the first node does not find a suitable cell before entering the first state.

As an embodiment, the first relay is in a camped on any cell state, and the cell to which the first relay is connected or camping is a suitable cell of the first node.

As a sub-embodiment of this embodiment, the first node enters a normal camping state in response to finding that the cell to which the first relay is connected or camping is a suitable cell.

As a sub-embodiment of this embodiment, the first node performs relay selection and discovers a second relay, which is a suitable relay and which is in a normal stay state or connected mode, which the first node selects.

As an embodiment, the third set of conditions comprises that a suitable cell is found.

As an embodiment, the third set of conditions includes finding a suitable relay.

As one embodiment, when the first node is in a normal camping state and the camping cell is not available, the first node performs relay selection and discovers the first relay, and the first node enters the first state.

As an embodiment, the first node transitions from the first state to an arbitrary cell selection state in response to all conditions in the fourth set of conditions being met; the fourth set of conditions includes at least a condition that cell selection is performed and no acceptable cells are found.

As a sub-embodiment of this embodiment, the third state is the arbitrary cell selection state.

As a sub-embodiment of this embodiment, the third state is not the arbitrary cell selection state.

As a sub-embodiment of this embodiment, the fourth set of conditions includes: no suitable cells were found.

As a sub-embodiment of this embodiment, the fourth set of conditions includes: no suitable relay was found.

As a sub-embodiment of this embodiment, the fourth set of conditions includes: relay selection is performed and no acceptable relays are found.

As an embodiment, the first node transitions from the first state to a camped on any cell state in response to a fifth set of conditions being met; the fifth set of conditions includes a condition that at least an acceptable cell is found and no suitable cell is found.

As a sub-embodiment of this embodiment, the fifth set of conditions includes: no suitable relay was found.

As a sub-embodiment of this embodiment, the fifth set of conditions includes: relay selection is performed and no acceptable relays are found.

Example 9

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

In fig. 9, the dashed lines indicate that the state transition is optional or that the state transition needs to go through other intermediate states or intermediate procedures such as cell selection and/or L2U 2N relay selection.

Embodiment 9 is based on embodiment 8, and the embodiment in embodiment 8 can be combined with the embodiment in embodiment 9.

In embodiment 9, the first state is not a normal resident state (sampled normal).

As an example, the second state in fig. 9 is Connected mode.

As an example, the second state in fig. 9 is not Connected mode.

As an example, the second state in fig. 9 is the relay connection mode.

The second state in fig. 9 is a mode of connection through a relay, as one example.

As an example, the second state in fig. 9 is the relay mode.

As an embodiment, the second set of conditions includes deciding to enter a connected mode.

As an embodiment, the second set of conditions includes a need to initiate traffic in the first set of traffic.

As an embodiment, the second set of conditions includes a need to initiate emergency services.

As an example, the third state in fig. 9 is an arbitrary cell selection state.

As an example, the third state in fig. 9 is one of { any relay selection state, any L2U 2N relay selection state, out of coverage state, any cell and relay selection state, any cell and L2U 2N relay selection state, any access point selection state }.

As an embodiment, after leaving the second state, the first node performs cell selection or initial cell selection, enters the normal camping state if a suitable cell is found, enters the third state directly or through other intermediate states if no suitable cell is found, and is any cell selection state.

As an embodiment, after leaving the second state, the first node performs L2U 2N relay selection, enters the first state if a suitable L2U 2N relay is found, and enters the third state if a suitable L2U 2N relay is not found.

As an embodiment, after leaving the second state, the first node performs cell selection or initial cell selection, enters the first state if no suitable cell is found but an acceptable cell is found, enters the third state directly or through other intermediate states if no suitable cell is found or an acceptable cell is found, and the third state is any cell selection state.

As an embodiment, after leaving the second state, the first node performs relay selection and cell selection, enters the first state if no suitable cell is found and no suitable relay is found but an acceptable relay is found, enters the third state directly or via other intermediate states if no suitable cell is found and no acceptable relay is found, and the third state is any cell selection state.

As an embodiment, when the first node is in the normal camping state, no suitable cell is found or the camping cell is no longer a suitable cell nor a suitable relay is found, a transition is made to the third state, which is one of { any relay selection state, any cell and relay selection state, any relay or cell selection state }.

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

As an embodiment, when the first node is in the third state and the quality of the camped cell is lower than a first quality requirement, the first node performs relay selection and/or cell selection, as a result of which the first node finds an acceptable L2U2N relay, the first node transitions from the third state to the first state directly or through other intermediate states.

As an embodiment, when the first node is in the first state, a system message is received through the first relay, the first relay is an acceptable L2U2N relay, the signal quality of the first relay no longer meets the requirement or the first relay is no longer an acceptable L2U2N relay, triggering the first node to perform relay selection and/or cell selection.

As a sub-embodiment of this embodiment, the first node transitions from the first state to the normal camping state in response to finding a suitable cell.

As a sub-embodiment of this embodiment, the first node transitions from the first state to the normal stay state in response to finding a suitable relay.

As a sub-embodiment of this embodiment, the first node transitions from the first state to the first state as a response that neither a suitable cell nor a suitable relay is found but an acceptable cell is found.

As a sub-embodiment of this embodiment, the first node transitions from the first state to the normal camping state in response to not finding a suitable relay nor a suitable cell but finding an acceptable relay.

As an embodiment, when the first node is in the first state, it is found that the quality of at least the second cell meets a first quality requirement.

As a sub-embodiment of this embodiment, the act finds that at least the quality of the second cell meets the first quality requirement triggering the first node to perform cell selection.

As a sub-embodiment of this embodiment, the act finds that at least the quality of the second cell meets the first quality requirement triggers the first node to select the second cell.

As a sub-embodiment of this embodiment, the act finds that at least the quality of the second cell meets the first quality requirement triggers the first node to trigger the first node to stop using the first relay.

As a sub-embodiment of this embodiment, the act finds that at least the quality of the second cell meets the first quality requirement triggers the first node to trigger the first node to stop using L2U 2N relays.

As a sub-embodiment of this embodiment, the first quality requirement is used to determine whether to allow selection of an L2U 2N relay, i.e. to allow selection of an L2U 2N relay only when all cells do not meet the first quality requirement.

As a sub-embodiment of this embodiment, the first quality requirement is used to determine whether to allow selection of an L2U 2N relay, i.e. to allow selection of an L2U 2N relay only when all suitable cells do not meet the first quality requirement.

As a sub-embodiment of this embodiment, the first quality requirement is used to determine whether to allow selection of an L2U 2N relay, i.e. to allow selection of an L2U 2N relay only when the first quality requirement is not met by the best one of all measurable or best cells or suitable cells.

As a sub-embodiment of this embodiment, the first quality requirement is used to determine whether to allow selection of an L2U 2N relay, i.e. not to allow use of an L2U 2N relay when there is a cell satisfying the first quality requirement.

As a sub-embodiment of this embodiment, the first quality requirement comprises that the measured cell signal quality meets a certain threshold.

As a sub-embodiment of this embodiment, the first quality requirement comprises that the measured RSRP of the cell meets a certain level threshold.

As a sub-embodiment of this embodiment, the first quality requirement comprises that the measured RSRQ of the cell meets a certain quality threshold.

As an embodiment, the first node receives the updated first quality requirement, and triggers the first node to perform cell selection and/or L2U 2N relay selection.

As a sub-embodiment of this embodiment, the first node may use L2U 2N relay only when the quality of the currently camping cell is below the first quality requirement.

As a sub-embodiment of this embodiment, the first node may use L2U 2N relay only when the quality of all suitable cells is below the first quality requirement.

As a sub-embodiment of this embodiment, the first node may use L2U 2N relay only when the quality of all suitable cells and all acceptable cells is below the first quality requirement.

As a sub-embodiment of this embodiment, the first node may use L2U 2N relay only when the quality of all detectable cells is below the first quality requirement.

As an embodiment, the first node in the first state enters the connection mode from the first state when it needs to initiate a service other than the first service set.

As an embodiment, the first node in the first state, in response to finding a suitable cell, enters a normal camping state, and in response to needing to leave an RRC idle state to enter an RRC connected state, transitions to the connected mode.

As an embodiment, the first node in the first state, in response to finding a suitable relay, enters a normal stay state, and in response to needing to leave an RRC idle state to enter an RRC connected state, transitions to the connected mode.

As an embodiment, when the first node leaves the connected mode, cell selection and/or relay selection is performed, and the first state is entered in response to all conditions in the first set of conditions being met.

As a sub-embodiment of this embodiment, the first set of conditions includes: no suitable cells were found.

As a sub-embodiment of this embodiment, the first set of conditions includes: no suitable relay was found.

As a sub-embodiment of this embodiment, the first set of conditions includes: no suitable relay cell is found.

As a sub-embodiment of this embodiment, the first set of conditions includes: an acceptable cell was found.

As a sub-embodiment of this embodiment, the first set of conditions includes: an acceptable relay is found.

As a sub-embodiment of this embodiment, the first set of conditions includes: an acceptable relay cell is found.

As a sub-embodiment of this embodiment, the act of performing cell selection and/or relay selection is performed on a specific frequency.

Example 10

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

The dashed line in fig. 10 identifies that the conversion relationship is optional.

The embodiment of embodiment 10 may be combined with at least some of the embodiments of embodiment 8.

The embodiment in embodiment 10 can be combined with at least some of the embodiments in embodiment 9.

As an embodiment, the first state is not a camped on any cell state.

As an embodiment, the first state is one of { camp on any relay, camp on any relay cell, camp on any state, camp on any node }.

As an embodiment, the first state is a state related to a non-direct path.

As one embodiment, the name of the first state includes a relay.

As an embodiment, the name of the first state includes direct.

As one embodiment, the name of the first state includes a stamp.

As an embodiment, the first state transitions to the camped-on arbitrary cell state in response to all conditions in the fifth set of conditions being met.

As an embodiment, the fifth set of conditions includes finding an acceptable cell.

As an embodiment, the fifth set of conditions includes that the first relay is no longer an acceptable relay.

As an embodiment, the fifth set of conditions includes that the first relay is no longer a suitable relay.

As an embodiment, the first state transitions to the camped-on arbitrary cell state in response to any condition of the fifth set of conditions being met.

As one embodiment, when the first node is in the camped-on arbitrary cell state, the first node performs relay selection and discovers an accepted relay, and the first node transitions from the camped-on arbitrary cell state to the first state.

As an embodiment, when the first node is in the camped-on arbitrary cell state, the first node performs relay selection and finds a suitable relay, and the found PLMN of the serving cell of the suitable relay is not the PLMN selected or registered by the first node nor is in the equivalent PLMN list of the first node, the first node transitions from the camped-on arbitrary cell state to the first state.

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, a first processor 1102 and a first transmitter 1103. In the case of the embodiment of the present invention in which the sample is a solid,

The first receiver 1101, in response to the first set of conditions being satisfied, enters a first state; executing a first set of operations in the first state;

a first processor 1102 that transitions from the first state to a second state in response to any of a second set of conditions being met; transitioning from the first state to a normally resident state in response to any of a third set of conditions being met;

As an embodiment, the first processor 1102 transitions from the first state to an arbitrary cell selection state in response to a fourth set of conditions being met; the fourth set of conditions includes at least a condition that cell selection is performed and no acceptable cells are found.

As an embodiment, the first processor 1102 transitions from the first state to a camped on any cell state in response to a fifth set of conditions being met; the fifth set of conditions includes a condition that at least an acceptable cell is found and no suitable cell is found.

As an embodiment, the first state is a camped on any cell state, the first set of conditions includes that a suitable relay is found and that a serving cell of the found suitable relay only supports the first set of services.

As an embodiment, the first receiver 1101 performs relay selection and discovers a suitable relay and the discovered PLMN of the serving cell of the suitable relay is either the PLMN selected by the first node or the PLMN registered by the first node or an equivalent PLMN list belonging to the first node; leaving the first state.

As an embodiment, the first receiver 1101 performs a cell selection reselection evaluation and does not find a cell that meets a first quality criterion before the behavior enters the first state;

As an embodiment, the first receiver 1101 determines that the first cell is an acceptable cell according to a second criterion; the first cell does not meet a first quality criterion;

As an embodiment, the first receiver 1101 performs cell selection and relay selection, and does not find a PLMN of a suitable cell nor a serving cell, either the PLMN selected by the first node or the PLMN registered by the first node or the relay belonging to the equivalent PLMN list of the first node; determining that a serving cell of the first relay is an acceptable cell;

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

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

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

As an embodiment, the first node is an aircraft.

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

As an embodiment, the first node is a relay.

As an embodiment, the first node is a ship.

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

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

As an embodiment, the first node is a device supporting low latency 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 1103 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, comprising:

the first processor transitioning from the first state to an arbitrary cell selection state in response to a fourth set of conditions being satisfied; the fourth set of conditions includes at least a condition that cell selection is performed and no acceptable cells are found.

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

the first processor transitioning from the first state to a camped on any cell state in response to a fifth set of conditions being satisfied; the fifth set of conditions includes a condition that at least an acceptable cell is found and no suitable cell is found.

4. A first node according to any one of the claims 1 to 3, characterized in that,

the PLMN of the serving cell of the first relay is not the PLMN selected by the first node nor the PLMN registered by the first node nor the equivalent PLMN list of the first node.

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

the first state is a camped on any cell state, the first set of conditions includes that a suitable relay is found and that a serving cell of the found suitable relay only supports the first set of services.

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

the first state is a camped on any cell state and the first set of conditions includes finding an acceptable relay.

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

the first receiver performing relay selection and discovering a suitable relay and the discovered PLMN of the serving cell of the suitable relay is either the PLMN selected by the first node or the PLMN registered by the first node or an equivalent PLMN list belonging to the first node; leaving the first state.

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

the first receiver performing a cell selection reselection evaluation and not finding a cell that meets a first quality criterion before the act enters a first state;

9. The first node according to any of claims 1 to 8, comprising:

the first receiver determines the first cell as an acceptable cell according to a second criterion; the first cell does not meet a first quality criterion;

10. The first node according to any of claims 1 to 9, comprising:

the first receiver performs cell selection and relay selection, and does not find a PLMN of a suitable cell or a serving cell, either the PLMN selected by the first node or the PLMN registered by the first node or a relay belonging to an equivalent PLMN list of the first node; determining that a serving cell of the first relay is an acceptable cell;

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