CN115413057A

CN115413057A - Method and equipment used for wireless communication

Info

Publication number: CN115413057A
Application number: CN202111324975.6A
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: 2021-05-27
Filing date: 2021-11-10
Publication date: 2022-11-29

Abstract

The application discloses a method and a device used for wireless communication, comprising the following steps: starting a first timer; selecting a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer in conjunction with sending the first message; operating the first timer according to a transmission mode to at least the first serving cell; transmitting a third wireless signal, the third wireless signal comprising a third message, the third message for requesting an RRC connection; the method and the device ensure the continuity of the service and reduce the interruption by reasonably controlling the first timer and the second timer.

Description

Method and equipment used for wireless communication

Technical Field

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

Background

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

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

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

Disclosure of Invention

In various communication scenarios, establishment and reconstruction of an entity and a link may be involved, and particularly in the case of key update, reconstruction of the relevant entity is required to ensure security. When ciphering is performed by the PDCP entity, the PDCP entity concerned is re-established. In scenarios involving relays, communication between UEs may be involved. The relay may be another UE, and this UE acting as a relay node may be stationary or mobile, e.g. a car. Generally, the communication range of the relay node is smaller than that of the serving cell, and the relay node is often used to appropriately enlarge the service range of the serving cell or solve the problem of blocking of a wireless shadow building in the coverage. Short distance combined with movement or fast movement more easily causes instability of communication between the remote UE and the relay node, and compared to a stationary serving cell with a large coverage area, the link between the remote node and the relay node is more unstable, and the remote node may need to change the relay node more frequently, and resume the connection with the serving cell more frequently. When restoring the connection with the serving cell, it involves re-establishment of RRC connection and possibly PDCP entity if a key change of the new serving cell occurs. In the process of reestablishing the connection between the remote node and the network through the relay, the radio links between the remote node and the relay node and between the relay node and the serving cell may fail or have failed, or the access of the relay node is denied or the relay node cannot provide the relay service, and the like. The existing technology for the non-relay condition cannot support the quick replacement of different nodes to initiate a reconstruction or access request, so that the time delay is large, and the data interruption is easily caused.

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

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

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

starting a first timer; selecting a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer in conjunction with sending the first message; operating the first timer according to a transmission mode to at least the first serving cell; transmitting a third wireless signal, the third wireless signal comprising a third message, the third message for requesting an RRC connection;

wherein expiration of the first timer is used to trigger the first node to enter an RRC idle state; the act of operating the first timer in accordance with a transmission mode to at least the first serving cell comprises: stopping the first timer in response to selecting the first serving cell when the transmission mode to the first serving cell is through relay transmission; when the transmission mode to the first serving cell is direct transmission, continuing to run the first timer after the act of selecting the first serving cell.

As an embodiment, the problem to be solved by the present application includes: how to rapidly attempt RRC reconstruction in an unstable communication network, especially when a relay is involved, reduces data interruption and provides service continuity.

As an example, the benefits of the above method include: the proposed method can solve the above problem, starting the first timer when a UE initiates a re-establishment, and in an unstable network, for example, when it receives re-establishment feedback from the network, it is stopped, during which multiple attempts can be made quickly, instead of terminating the timer when one attempt is initiated or when one attempt is ready to be initiated.

In particular, according to one aspect of the present application, a second wireless signal is received, the second wireless signal including a second message used to determine that the first message was not successfully distributed.

Specifically, according to an aspect of the present application, the second message is used to trigger stopping the first timer and the second timer, and the first node enters an RRC idle state;

wherein the third radio signal is transmitted upon the first node entering an RRC idle state; the third message is for requesting establishment of an RRC connection.

Specifically, according to an aspect of the present application, the second message is used to trigger restarting the second timer and sending the third message; the third message is used to request RRC reestablishment.

Specifically, according to an aspect of the present application, a fourth wireless signal is received, where the fourth wireless signal includes a fourth message, and the fourth message is used for feeding back the third message;

the fourth message is used to trigger stopping the first timer and the second timer.

In particular, according to an aspect of the present application, the second message is used to trigger a reselection of a relay.

Specifically, according to an aspect of the present application, a failure of a first radio link is detected, and the first radio signal is transmitted through the first radio link;

in response to detecting the first radio link failure, stopping the second timer and performing selecting a serving cell.

Specifically, according to one aspect of the present application, a first discovery signal is received, the first discovery signal being used to indicate a first serving cell; the act of selecting a first serving cell includes selecting a sender of the first discovery signal as a relay.

Specifically, according to an aspect of the present application, the first message is an nth RRC reestablishment request attempt initiated by the first timer during operation, where N is greater than 1, and all serving cells to which the N RRC reestablishment request attempts are directed are the first serving cell; the transmission of the N RRC reestablishment requests to the first serving cell is by relay transmission.

Specifically, according to one aspect of the present application, a first timer is started; selecting a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer with the sending of the first message; operating the first timer in accordance with a transmission mode to at least the first serving cell; transmitting a third wireless signal, the third wireless signal comprising a third message, the third message for requesting an RRC connection;

wherein expiration of the first timer is used to trigger the first node to enter an RRC idle state; the act of operating the first timer in accordance with a transmission mode to at least the first serving cell comprises: stopping the first timer in response to selecting the first serving cell when the transmission mode to the first serving cell is direct transmission; when the transmission mode to the first serving cell is through relay transmission, continuing to run the first timer after the behavior selects the first serving cell.

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

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

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

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

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

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

a first transmitter to start a first timer; selecting a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer with the sending of the first message; operating the first timer according to a transmission mode to at least the first serving cell; transmitting a third wireless signal, the third wireless signal comprising a third message, the third message for requesting an RRC connection;

As an example, compared with the conventional scheme, the present application has the following advantages: the method provided by the application can support the remote node (remote UE) to try the reestablishment of the RRC connection for many times during the running period of the first timer in the process of starting the reestablishment of the RRC connection, so that the success rate of the reestablishment of the RRC connection is increased, the data interruption is reduced, the reliability is improved, and the method is particularly suitable for networks using relay communication.

As an example, compared with the conventional scheme, the present application has the following advantages: the method provided by the application can rapidly reselect the relay to initiate the reconstruction again after the remote node receives the feedback of the relay node which can determine the failure of the transmission of the reconstruction request message.

As an example, compared with the conventional scheme, the method has the following advantages: the method provided by the application can quickly select the direct connection network or select other relays to initiate a new RRC establishment request after the remote node receives the feedback of the relay node which can determine the transmission failure of the reestablishment request message, can save time and quickly reenter the connection network without waiting for the expiration of the second timer, namely, the second timer is terminated in advance.

Drawings

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

fig. 1 shows a flowchart of starting a first timer, selecting a first serving cell, transmitting a first wireless signal, and transmitting a third wireless signal according to one embodiment of the application;

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

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

FIG. 4 shows a schematic diagram of a first node according to an embodiment of the present application;

FIG. 5 shows a flow diagram of a transmission according to an embodiment of the application;

FIG. 6 shows a flow diagram of a transmission according to an embodiment of the application;

FIG. 7 shows a schematic diagram of a candidate node group according to an embodiment of the application;

FIG. 8 illustrates a diagram where a second message is used to determine that a first message was not successfully distributed, according to one embodiment of the present application;

figure 9 shows a schematic diagram of a second message used to trigger reselection of a relay according to one embodiment of the present application;

fig. 10 illustrates a schematic diagram of a processing device for use in a first node according to an embodiment of the application.

Detailed Description

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

Example 1

Embodiment 1 illustrates a flowchart of starting a first timer, selecting a first serving cell, transmitting a first wireless signal, and transmitting a third wireless signal according to an embodiment of the present application, as shown in fig. 1. In fig. 1, each block represents a step, and it should be particularly emphasized that the sequence of the blocks in the figure does not represent a chronological relationship between the represented steps.

In embodiment 1, a first node in the present application starts a first timer in step 101; selecting a first serving cell in step 102; transmitting a first wireless signal in step 103; transmitting a third wireless signal in step 104;

wherein the first wireless signal comprises a first message requesting RRC reestablishment; starting a second timer in conjunction with sending the first message; operating the first timer in accordance with a transmission mode to at least the first serving cell; the third wireless signal comprises a third message requesting an RRC connection; expiration of the first timer is used to trigger the first node to enter an RRC idle state; the act of operating the first timer in accordance with a transmission mode to at least the first serving cell comprises: stopping the first timer in response to selecting the first serving cell when the transmission mode to the first serving cell is through relay transmission; when the transmission mode to the first serving cell is direct transmission, continuing to run the first timer after the act of selecting the first serving cell.

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

As an embodiment, the first wireless signal is transmitted at the PC5 interface.

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

As one embodiment, the third wireless signal is transmitted over a sidelink.

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

As an embodiment, the first wireless signal comprises a first MAC PDU comprising a first MAC sub-PDU, the header of the first MAC sub-PDU being a first MAC sub-header comprising 16 most significant bits of the first identity and 8 most significant bits of the second identity; the first identity is used to identify the first node.

As a sub-embodiment of the above embodiment, the first identity and the second identity are each a link layer identity.

As a sub-embodiment of the above embodiment, the first identity and the second identity are Layer-2 identities, respectively.

As a sub-embodiment of the above embodiment, said second identity is used to identify a second node; the second node is a relay node for the first node.

As a sub-embodiment of the above embodiment, the second identity is used to identify a relay of the first node.

As a sub-embodiment of the above embodiment, the second identity is used to identify a recipient of the first wireless signal.

As a sub-embodiment of the above embodiment, said second identity is used to identify a recipient of said first message.

As a sub-embodiment of the above embodiment, the node identified by the second identity is a node other than the generator of the first message.

As an embodiment, the Physical Channel occupied by the first wireless signal includes a PUSCH (Physical Uplink Shared Channel).

For one embodiment, the first wireless signal is transmitted over a main link.

As an embodiment, when the transmission means to the first serving cell is by relay transmission, the receiver of the first wireless signal is a relay node.

As an embodiment, when the transmission mode to the first serving cell is transmission through relay, the first wireless signal includes a first MAC PDU, the first MAC PDU includes a first MAC sub-PDU, a header of the first MAC sub-PDU is a first MAC sub-header, and the first MAC sub-header includes 16 most significant bits of a first identity and 8 most significant bits of a second identity; the first identity is used to identify the first node.

As an embodiment, when the transmission manner to the first serving cell is through relay transmission, the first wireless signal is transmitted along with SCI (Sidelink Control Information).

As an embodiment, when the transmission mode to the first serving cell is through relay transmission, the first wireless signal is transmitted on a sidelink.

As an embodiment, when the transmission mode to the first serving cell is direct transmission, the receiver of the first wireless signal is a serving cell.

As a sub-embodiment of the above embodiment, the recipient of the first wireless signal is the first serving cell.

As a sub-embodiment of the above embodiment, the first wireless signal carries a msg3 message.

As a sub-embodiment of the above embodiment, the first wireless signal is a msg3 message.

As a sub-embodiment of the above embodiment, the first radio signal is transmitted on a resource indicated by a RAR (Random Access Response).

As a sub-embodiment of the above embodiment, the first wireless signal is occupying a PUSCH channel.

As one embodiment, the first wireless signal is a physical layer signal.

As an embodiment, the first timer is a timer of an RRC layer; alternatively, the first timer is maintained by the RRC layer.

As an embodiment, the first timer is started during the first node starts RRC connection re-establishment.

As an embodiment, the first timer is started in response to the first node initiating a procedure for RRC connection Re-establishment (RRC Re-establishment).

As an embodiment, expiration of the first timer triggers the first node to enter an RRC IDLE state.

For one embodiment, the first timer includes T311.

As one embodiment, the first timer is T311.

As one embodiment, the first timer is not T311.

As an embodiment, the first timer is a relay related timer.

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

As an embodiment, the name of the first timer includes T1 or T2.

As an example, the name of the first timer includes T4.

As one embodiment, the first timer is T411.

As an embodiment, the first timer is T301.

As an example, the first timer is T401.

For one embodiment, the first timer is T402.

As an example, the first timer and T311 are started simultaneously.

For one embodiment, the first message comprises a rrcreestablishrequest.

For one embodiment, the first message comprises an rrcconnectionreestablishingrequest.

For one embodiment, the first message is rrcreestablshmentirequest.

For one embodiment, the first message is an rrcconnectionreestablishingrequest.

For one embodiment, the first message includes a ue-Identity.

For one embodiment, the first message comprises a resendapalishmentcause.

For one embodiment, the first message includes a c-RNTI.

As one embodiment, the first message includes a physcellld.

For one embodiment, the first message includes a shortMAC-I.

As an embodiment, the physcellld included in the first message is used to indicate the physical cell identity of the Pcell to which the first node was connected prior to the failure.

As an embodiment, the first message is sent with a fixed configuration.

As an embodiment, the first message is sent over the PC5 interface.

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

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

As one embodiment, the first message is encrypted.

As one embodiment, the first message is not encrypted.

As an embodiment, the RLC channel occupied by the first message is fixed.

As an embodiment, the relay of the first node generates an rrcreestableshmentrequest message according to the first message, and sends the generated rrcreetablepresenmentrequest to the first serving cell.

As an embodiment, the receiver of the first wireless signal generates a rrcreestableblementrequest message according to the first message, and sends the generated rrcreetablementrequest to the first serving cell.

As an embodiment, the relay of the first node forwards the first message to the first serving cell.

As one embodiment, the phrase selecting a first serving cell comprises: cell selection is performed and a suitable (able) cell is selected.

As one embodiment, the phrase selecting the first serving cell comprises: cell selection is performed and an acceptable (acceptable) cell is selected.

As one embodiment, the phrase selecting a first serving cell comprises: the cell selection is performed according to the S criteria, and a suitable (able) cell is selected.

As one embodiment, the phrase selecting a first serving cell comprises: a first serving cell is determined as a recipient of the first wireless signal.

As one embodiment, the phrase selecting a first serving cell comprises: and determining a first serving cell, and attempting to connect the first serving cell by a direct transmission mode.

As one embodiment, the phrase selecting a first serving cell comprises: the cell identity of the first serving cell is determined by SIB1 system messages.

As one embodiment, the phrase selecting a first serving cell comprises: a relay selection is performed.

As one embodiment, the phrase selecting a first serving cell comprises: performing a relay selection, the selected relay residing in the first serving cell.

As one embodiment, the phrase selecting the first serving cell comprises: selecting a second node, the second node being a relay of the first node, the second node having an RRC connection with the first serving cell.

As one embodiment, the phrase selecting a first serving cell comprises: selecting a second node, the second node being a relay of the first node, a PCell of the second node being the first serving cell.

As one embodiment, the phrase selecting a first serving cell comprises: selecting a first serving cell as a recipient of the first message.

As one embodiment, the phrase selecting a first serving cell comprises: selecting a second node, the discovery message (discovery message) sent by the second node comprising the identity of the first serving cell.

As one embodiment, the phrase selecting the first serving cell comprises: attempting (attempt) RRC connection reestablishment on the first serving cell.

As one embodiment, the phrase selecting the first serving cell comprises: setting a resendabilishmellld to the identity of the first serving cell.

As one embodiment, the phrase selecting the first serving cell comprises: and taking the first serving cell as a target cell for RRC reconstruction of the first node.

For one embodiment, the third message includes a RRCSetupRequest.

For one embodiment, the third message comprises a RRCReestablishmentRequest.

As an embodiment, the third message comprises an RRCConnectionSetupRequest.

For one embodiment, the third message comprises an rrcconnectionreestablishingrequest.

As an embodiment, the first timer is in a running state when the first serving cell is selected.

As an embodiment, selecting the first serving cell comprises the first node selecting a relay according to signal quality, the selected relay camping on the first serving cell or the selected relay establishing a connection with the first serving cell.

As one embodiment, the act of starting the second timer includes starting (start) and restarting (restart).

As an embodiment, the sentence being accompanied by the first message, starting a second timer comprises: the first message is sent, the second timer is started or restarted.

As an embodiment, the sentence being accompanied by sending the first message, starting a second timer comprises: the behavior selection of the first serving cell triggers the first message to be sent while triggering the second timer to be started or restarted.

As an embodiment, the sentence being accompanied by the first message, starting a second timer comprises: initiating the RRC reestablishment procedure triggers the first message to be sent while triggering the second timer to be started or restarted.

As an embodiment, the relay of the first node and the first serving cell use the same access technology.

As a sub-embodiment of the above embodiment, the relay of the first node is a second node.

As a sub-embodiment of the above embodiment, the relay of the first node is a recipient of the first wireless signal.

As an embodiment, the second timer is started when rrcreestablshmentirequest is sent.

As an embodiment, the second timer is started when rrcconnectionresessalibestimentrequest is transmitted.

As one embodiment, the second timer is started when the rrcelestablishrequest message is sent.

As an embodiment, the second timer is started when an rrcconnectionresestostringrequest message is sent.

For one embodiment, the second timer is stopped when a RRCReestablishment message is received.

For one embodiment, the second timer is stopped when an RRCConnectionReestablishment message is received.

As an embodiment, the second timer is stopped when an RRCSetup message is received.

As an embodiment, the second timer is stopped when an RRCConnectionSetup message is received.

For one embodiment, the second timer includes T301.

As one embodiment, the second timer is T301.

As an embodiment, the second timer is not T301.

For one embodiment, the second timer is T305.

As an embodiment, the second timer is T306.

As an embodiment, the second timer is T307.

As an embodiment, the second timer is T308.

As one embodiment, the second timer is T309.

As one embodiment, the second timer is T301a.

As an embodiment, the second timer is T301b.

As an embodiment, the second timer is T301r.

As an embodiment, the second timer is T301c.

As one embodiment, the second timer is not T311.

As one embodiment, the second timer is T313.

As one example, the second timer is T314.

As an embodiment, the second timer is T315.

As an example, the second timer is T316.

As an embodiment, the second timer is T401.

As an embodiment, the second timer is T402.

For one embodiment, the second timer is T404.

As an embodiment, the second timer is T411.

As an embodiment, the second timer is T410.

For one embodiment, the second timer is T412.

As an example, the second timer is T413.

For one embodiment, the second timer is T414.

As one embodiment, the second timer is T500.

As an embodiment, the second timer is T501.

As an embodiment, the second timer is T511.

As one embodiment, the second timer is T510.

As one example, the second timer is T512.

As one embodiment, the second timer is T513.

As one embodiment, the second timer is T514.

As an embodiment, the name of the second timer comprises r.

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

As an embodiment, the name of the second timer comprises sl.

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

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

As an embodiment, the expiration of the second timer triggers the first node to enter an RRC idle state.

As an embodiment, expiration of the second timer triggers the first node to perform an RRC reestablishment.

As an embodiment, expiration of the second timer triggers the first node to perform relay selection.

As an embodiment, the expiration values of the first timer and the second timer are fixed or pre-configured.

As an embodiment, the expiration values of the first timer and the second timer are configured by system messages.

As an embodiment, the third wireless signal is transmitted at the PC5 interface.

As an embodiment, the Physical Channel occupied by the third radio signal includes a psch (Physical Sidelink Shared Channel).

As an embodiment, the third wireless signal comprises a first MAC PDU comprising a first MAC sub-PDU whose header is a first MAC sub-header comprising 16 most significant bits of the first identity and 8 most significant bits of the second identity; the first identity is used to identify the first node.

As a sub-embodiment of the above embodiment, the second identity is used to identify a recipient of the third wireless signal.

As a sub-embodiment of the above embodiment, the second identity is used to identify a recipient of the first message.

As a sub-embodiment of the above embodiment, the node identified by the second identity is a node other than the first node and the second node.

As an embodiment, the Physical Channel occupied by the third wireless signal includes a PUSCH (Physical Uplink Shared Channel).

As one embodiment, the third wireless signal is transmitted over a main link.

As an embodiment, when the transmission mode to the first serving cell is through relay transmission, the receiver of the third wireless signal is a relay node.

As an embodiment, when the transmission mode to the first serving cell is transmission through relay, the third wireless signal includes a first MAC PDU, the first MAC PDU includes a first MAC sub-PDU, a header of the first MAC sub-PDU is a first MAC sub-header, and the first MAC sub-header includes 16 most significant bits of a first identity and 8 most significant bits of a second identity; the first identity is used to identify the first node.

As an embodiment, when the transmission scheme to the first serving cell is relay transmission, the third wireless signal is transmitted along with SCI (Sidelink Control Information).

As an embodiment, when the transmission mode to the first serving cell is through relay transmission, the third wireless signal is transmitted on a secondary link.

As an embodiment, when the transmission mode to the first serving cell is direct transmission, the receiver of the third wireless signal is a serving cell.

As a sub-embodiment of the above embodiment, the receiver of the third wireless signal is the first serving cell.

As a sub-embodiment of the above embodiment, the third wireless signal carries a msg3 message.

As a sub-embodiment of the above embodiment, said third radio signal is a msg3 message.

As a sub-embodiment of the above embodiment, the third wireless signal is transmitted on a resource indicated by an RAR (Random Access Response).

As a sub-embodiment of the above embodiment, the third wireless signal is occupying a PUSCH channel.

As one embodiment, the third wireless signal is a physical layer signal.

As one embodiment, the act of operating the first timer includes only one of stopping the first timer or continuing to run the first timer.

As an embodiment, the transmission mode of the first serving cell includes only one of relay transmission and direct transmission.

As an embodiment, the transmission manner through relay transmission of the first serving cell means indirect (indirect) transmission.

As an embodiment, the first node determines the transmission mode of the first serving cell according to a pre-configuration.

As an embodiment, the first node determines the transmission mode of the first serving cell according to a parameter provided by a system message.

As an embodiment, the first node determines the transmission mode of the first serving cell according to an internal algorithm.

As an embodiment, the first node determines the transmission mode of the first serving cell from measurements including signal strength.

As an embodiment, when the transmission mode to the first serving cell is through relay transmission, the relay mode of the relay transmission is layer 2 relay.

As an embodiment, when the transmission scheme to the first serving cell is through relay transmission, the relay scheme of the relay transmission is L2 relay.

As an embodiment, when the transmission manner to the first serving cell is through relay transmission, the relay manner of the relay transmission is Layer 2 relay.

As an embodiment, when the transmission mode to the first serving cell is through relay transmission, the relay mode of the relay transmission is a type 2 relay.

As an embodiment, when the transmission mode to the first serving cell is through relay transmission, the relay mode of the relay transmission is a first type relay.

As an embodiment, the sentence comprises the meaning that the opposite end of the physical layer of the first node is maintained by the first serving cell when the transmission means to the first serving cell is a direct transmission.

As an embodiment, the sentence includes the meaning that the opposite end of the MAC entity of the first node is maintained by the first serving cell when the transmission manner to the first serving cell is direct transmission.

As an embodiment, the sentence includes the meaning that a peer RLC entity of the first node is maintained by the first serving cell when the transmission manner to the first serving cell is direct transmission.

As an embodiment, the sentence includes a meaning that an opposite end of a physical layer of the first node is maintained by a relay node when the transmission manner to the first serving cell is transmission by relay.

As an embodiment, the sentence includes a meaning that an opposite end of the MAC entity of the first node is maintained by a relay node when the transmission manner to the first serving cell is transmission through a relay.

As an embodiment, the sentence includes the following meaning when the transmission manner to the first serving cell is transmission by relay, a peer RLC entity of the first node being maintained by a relay node.

As an embodiment, the sentence comprises the meaning that the first message is forwarded by a relay to the first serving cell when the transmission means to the first serving cell is transmitted by a relay.

As an embodiment, the sentence includes a meaning when the transmission manner to the first serving cell is transmission through a relay, and the relay generates a rrcreestablementrequest according to the first message and issues the rrcreetablebleblewebmentrequest to the first serving cell.

As an embodiment, said sentence said continuing to run said first timer after said behavior selecting said first serving cell comprises the following meaning: maintaining a running state of the first timer after the act of selecting the first serving cell when the transmission to the first serving cell is a direct transmission.

As an embodiment, said sentence said continuing to run said first timer after said act of selecting said first serving cell comprises the following meaning: selecting the first serving cell is not used to trigger stopping the first timer when the transmission mode to the first serving cell is direct transmission.

As an embodiment, said sentence said continuing to run said first timer after said behavior selecting said first serving cell comprises the following meaning: when the transmission manner to the first serving cell is direct transmission, the condition that the first timer is stopped does not include that the first serving cell is selected.

As an embodiment, said sentence said continuing to run said first timer after said behavior selecting said first serving cell comprises the following meaning: not stopping the first timer after the behavior selects the first serving cell.

As an embodiment, said sentence said continuing to run said first timer after said behavior selecting said first serving cell comprises the following meaning: maintaining a running state of the first timer after the behavior selects the first serving cell when the transmission mode to the first serving cell is through relay transmission.

As an embodiment, said sentence said continuing to run said first timer after said act of selecting said first serving cell comprises the following meaning: selecting the first serving cell is not used to trigger stopping the first timer when the transmission mode to the first serving cell is through relay transmission.

As an embodiment, said sentence said continuing to run said first timer after said act of selecting said first serving cell comprises the following meaning: when the transmission manner to the first serving cell is transmission by relay, a condition that the first timer is stopped does not include that the first serving cell is selected.

As an embodiment, in response to starting the RRC reestablishment procedure, the first node sends an RRC reestablishment request message and starts the second timer, expiration of which is used to trigger the third radio signal.

As an embodiment, in response to starting the RRC reestablishment procedure, the first node sends an RRC reestablishment request message and starts a third timer, expiration of the third timer is used to trigger the third radio signal, and the first node starts a fourth timer in conjunction with sending the third radio signal.

As a sub-embodiment of the above embodiment, the expiration of the fourth timer is used to trigger the first node to enter an RRC idle state.

As an embodiment, expiration of the second timer is used to trigger reselection of a serving cell.

As a sub-embodiment of this embodiment, said reselecting the serving cell includes reselecting a relay camped on or connected to the serving cell.

As a sub-embodiment of this embodiment, the reselecting serving cell includes cell selection.

As a sub-embodiment of this embodiment, the reselecting the serving cell includes selecting a serving cell and sending a random access signal by direct transmission.

As an embodiment, expiration of the second timer is used to trigger the first node to perform relay selection, the third message being sent in response to a relay node being successfully selected.

As an embodiment, the expiry of the second timer is used to trigger the first node to perform cell selection, the third message being sent in response to a cell being successfully selected.

As a sub-embodiment of the above embodiment, in response to the cell being successfully selected, a third timer is started, expiration of which is used to trigger the first node to enter an RRC idle state.

As a sub-embodiment of the above embodiment, the relay selection is part of cell selection.

As an example, the meaning of a sentence when the transmission means to the first serving cell is a relay transmission is: L2U 2N relay is used.

As an example, the meaning of a sentence when the transmission means to the first serving cell is a relay transmission is: the appropriate relay is selected.

As an embodiment, the meaning of a sentence when the transmission means to the first serving cell is a transmission by a relay is: the appropriate L2 relay is selected.

As an embodiment, the meaning of a sentence when the transmission means to the first serving cell is a transmission by a relay is: the appropriate L2U 2N relay is selected.

As an embodiment, the meaning of a sentence when the transmission means to the first serving cell is a transmission by a relay is: a suitable L2U 2N relay UE is selected.

As an embodiment, the meaning of a sentence when the transmission means to the first serving cell is a transmission by a relay is: selecting the L2U 2N relay UE to receive at least system information of the first serving cell.

As an embodiment, the meaning of a sentence when the transmission means to the first serving cell is a transmission by a relay is: selecting the L2U 2N relay UE to receive at least the paging message of the first serving cell.

For one embodiment, the phrase selecting the first serving cell includes performing cell selection and performing relay selection.

As one embodiment, the phrase selecting a first serving cell includes performing cell selection and finding that the first serving cell is a suitable cell; and/or performing relay selection and finding a suitable relay and the first serving cell is the serving cell of the found relay.

As a sub-embodiment of this embodiment, the behavior performing relay selection is or comprises performing L2U 2N relay UE selection.

As a sub-embodiment of this embodiment, the act of performing relay selection is or includes performing L2U 2N relay selection.

As a sub-embodiment of this embodiment, the phrase finds a suitable relay refers to a finding of a suitable L2U 2N relay UE.

As a sub-embodiment of this embodiment, the meaning that the first serving cell is the serving cell of the relay that is found is: the first serving cell is a serving cell in a non-RRC connected state or a primary cell in an RRC connected state of the discovered relay.

As a sub-embodiment of this embodiment, when the first node selects an appropriate L2U 2N relay UE through relay, a transmission manner between the first node and a serving cell of the appropriate L2U 2N relay UE, that is, the first serving cell, is transmission through relay.

As a sub-embodiment of this embodiment, when the first node selects a suitable cell through cell selection, that is, the first serving cell, the transmission mode of the first node and the first serving cell is direct transmission.

As one embodiment, the phrase transmitting via a relay refers to transmitting using an indirect path.

As one embodiment, the phrase direct transmission refers to transmission using a direct path.

For one embodiment, the number of times the second timer may be restarted is configured during a run state of the first timer.

As an example, the number of times the second timer may be restarted is 1 during the first timer is in one run state.

For one embodiment, the second timer may be restarted more than 0 times during the first timer being in a run state.

As an embodiment, the first node initiates an RRC reestablishment procedure, the start of the first timer.

Example 2

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

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

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

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

As an embodiment, the ProSe function 250 is connected to the ProSe application server 230 through 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 through a PC1 reference point, respectively.

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

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

As an example, the third node gNB203 in the present application.

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

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

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

As an embodiment, the UE201 supports relay transmission.

As an embodiment, the UE241 supports relay transmission.

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

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

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

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

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

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

As an embodiment, the gNB203 is a satellite device.

Example 3

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

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

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

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

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

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

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

As an embodiment, the 4a message in this application is generated in RRC306.

As an embodiment, the 3a message in this application is generated in RRC306.

For one embodiment, the first protocol layer control PDU in this application is generated in AP308 or AP358.

For one embodiment, the first wireless signal is generated from PHY301 or PHY351.

As an example, the second wireless signal in the present application is generated in PHY301 or PHY351.

As an example, the third wireless signal in the present application is generated in PHY301 or PHY351.

As an example, the fourth wireless signal in the present application is generated in PHY301 or PHY351.

For one embodiment, the first discovery signal in this application is formed in PHY301 or PHY351.

Example 4

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

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

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

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

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

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

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

As an embodiment, the first communication device 450 apparatus includes: at least one processor and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, the first communication device 450 apparatus at least: starting a first timer; selecting a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer in conjunction with sending the first message; operating the first timer in accordance with a transmission mode to at least the first serving cell; transmitting a third wireless signal, the third wireless signal comprising a third message, the third message for requesting an RRC connection; wherein expiration of the first timer is used to trigger the first node to enter an RRC idle state; the act of operating the first timer in accordance with a transmission mode to at least the first serving cell comprises: stopping the first timer in response to selecting the first serving cell when the transmission mode to the first serving cell is through relay transmission; continuing to run the first timer after the act of selecting the first serving cell when the transmission to the first serving cell is a direct transmission.

As an embodiment, the first communication device 450 includes: a memory storing a program of computer readable instructions that when executed by at least one processor result in actions comprising: starting a first timer; selecting a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer with the sending of the first message; operating the first timer according to a transmission mode to at least the first serving cell; transmitting a third wireless signal, the third wireless signal comprising a third message, the third message for requesting an RRC connection; wherein expiration of the first timer is used to trigger the first node to enter an RRC idle state; the act of operating the first timer in accordance with a transmission mode to at least the first serving cell comprises: stopping the first timer in response to selecting the first serving cell when the transmission mode to the first serving cell is through relay transmission; continuing to run the first timer after the act of selecting the first serving cell when the transmission to the first serving cell is a direct transmission.

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

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

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

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

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

As an example, the first communication device 450 is a relay.

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

For one embodiment, the first communication device 410 is an access point.

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

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

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

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

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

Example 5

Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in fig. 5. In fig. 5, U01 corresponds to the first node of the present application, and it is specifically illustrated that the sequence in this example does not limit the sequence of signal transmission and the sequence of implementation in the present application, wherein the steps in F51, F52, and F53 are optional.

ForFirst node U01Receiving a first discovery signal in step S5101; transmitting a first wireless signal in step S5102; receiving a second wireless signal in step S5103; transmitting a third wireless signal in step S5104; the fourth wireless signal is received in step S5105.

For theSecond node U02Transmitting a first discovery signal in step S5201; receiving a first wireless signal in step S5202; the second wireless signal is transmitted in step S5203.

For theThird node U03Receiving the third wireless signal in step S5301; in step S5302, the fourth wireless signal is transmitted.

In embodiment 5, the first node U01, starts a first timer; selecting a first serving cell; the first wireless signal comprises a first message for requesting RRC reestablishment; starting a second timer in conjunction with sending the first message; operating the first timer according to a transmission mode to at least the first serving cell; the third wireless signal comprises a third message requesting an RRC connection;

wherein expiration of the first timer is used to trigger the first node to enter an RRC idle state; the act of operating the first timer in accordance with a transmission mode to at least the first serving cell comprises: stopping the first timer in response to selecting the first serving cell when the transmission mode to the first serving cell is through relay transmission; continuing to run the first timer after the act of selecting the first serving cell when the transmission to the first serving cell is a direct transmission.

As an embodiment, the first node U01 is a remote UE, the second node U02 is a relay, and the third node U03 is the first serving cell.

As an embodiment, the first node U01 is a remote UE, the second node U02 is a relay selected by the first node U01, and the third node U03 is a candidate cell of the first node U01.

As an embodiment, the first node U01 is a remote UE, the second node U02 is a relay, and the third node U03 is a base station.

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

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

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

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

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

For one embodiment, the third node U03 is the SpCell of the first node U01.

As an embodiment, the third node U03 is an MCG (Master Cell Group) of the first node U01.

As an embodiment, the communication interface between the first node U01 and the second node U02 is a PC5.

As an embodiment, the first node U01 and the second node U02 communicate using a sidelink.

As an embodiment, the communication interface between the first node U01 and the third node U03 is Uu.

As an embodiment, the communication interface between the second node U02 and the third node U03 is Uu.

As an example, the first node U01 communicates with the second node U02 using a sidelink.

As an example, the second node U02 communicates with the third node U03 using a primary link.

As one embodiment, the first wireless signal is a physical layer signal.

As one embodiment, the sentence meaning the first wireless signal comprises a first message comprises: the first wireless signal carries the first message.

As one embodiment, the sentence meaning that the first wireless signal comprises a first message comprises: the first wireless signal carries the first message.

As one embodiment, the sentence meaning that the second wireless signal comprises a second message comprises: the second wireless signal carries the second message.

As one embodiment, the sentence meaning that the first wireless signal comprises a second message comprises: the second wireless signal carries the second message.

As one embodiment, the sentence meaning that the third wireless signal comprises a third message comprises: the third wireless signal carries the third message.

As one embodiment, the sentence meaning that the fourth wireless signal comprises a fourth message comprises: the fourth wireless signal carries the fourth message.

As an embodiment, the first wireless signal includes a first PDCP PDU including the first message; the first PDCP PDU uses ciphering.

As an embodiment, the first PDCP PDU uses integrity protection.

As one embodiment, the first discovery signal is a physical layer signal.

As an embodiment, the physical channel occupied by the first discovery signal includes a pscch.

As an embodiment, the physical channel occupied by the first discovery signal includes a physical channel of a sidelink.

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

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

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

As a sub-embodiment of this embodiment, the first discovery message includes a discovery message (discovery message).

As a sub-embodiment of this embodiment, the first discovery message uses discovery mode a.

As a sub-embodiment of this embodiment, the first discovery message uses discovery mode B.

As a sub-embodiment of this embodiment, the first discovery message is transmitted using SRB 4.

As a sub-embodiment of this embodiment, the first discovery message includes a PLMN (Public Land Mobile Network) identity.

As a sub-embodiment of this embodiment, the first discovery message includes an identity of the first serving cell.

As a sub-embodiment of this embodiment, the first discovery message includes a relay service code (relay service code).

As a sub-embodiment of this embodiment, the first discovery message includes a first identity and a second identity.

As a sub-embodiment of this embodiment, the second identity is used to identify the second node U02.

As a sub-embodiment of this embodiment, the first identity is used to identify the first node U01.

As a sub-embodiment of this embodiment, the first identity is used to identify a first group to which the first node U01 belongs.

As an embodiment, the second node U02 sends a first system message comprising at least part of the bits of SIB1 of the first serving cell.

For one embodiment, the first node U01 receives the first system message.

For one embodiment, the first system message includes an identity of the first serving cell.

As an embodiment, SIB1 of the first serving cell is used to generate the first system message.

As an embodiment, SIB1 of the first serving cell is used to generate the first discovery message.

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

As an embodiment, the first system message is sent by means of unicast.

As an embodiment, the first system message is transmitted by broadcasting.

As an embodiment, the first system message is sent by means of multicast.

As an embodiment, the first system message includes a PLMN identity included in the first discovery message.

As an embodiment, the PLMN identity included in the first discovery message is used to select the first serving cell.

As a sub-embodiment of the above embodiment, the PLMN indicated by the first discovery message is a PLMN supported or allowed to access by the first node U01.

As a sub-embodiment of the above embodiment, the PLMN indicated by the first discovery message is an HPLMN or EHPLMN (Equivalent Home PLMN, equivalent to Home PLMN) of the first node U01.

As a sub-embodiment of the above embodiment, when the PLMN indicated by the first discovery message is a PLMN supported by the first node U01, the first node U01 selects the first serving cell.

As a sub-embodiment of the above embodiment, when the PLMN indicated by the first discovery message is a HPLMN (Home PLMN) of the first node U01, the first node U01 selects the first serving cell.

As an embodiment, the second node U02 receives the first wireless signal.

As an embodiment, the second node U02 does not receive the first wireless signal.

As an embodiment, the first node U01 detects a failure of a first wireless link, and the first wireless signal is transmitted through the first wireless link; in response to detecting the first radio link failure, the first node U01 stops the second timer and performs selecting a serving cell.

As a sub-embodiment of the above embodiment, the first node U01 regards that the radio link failure is detected by monitoring the strength of the radio signal, and when the strength of the radio signal is found to be lower than a predefined threshold, the first node U01.

As a sub-embodiment of the foregoing embodiment, the first node U01, by monitoring the strength of the wireless signal on the time-frequency resource occupied by the first wireless link, when the strength of the wireless signal is found to be lower than a predefined threshold, considers that a wireless link failure is detected by the first node U01.

As a sub-embodiment of the above embodiment, the first node U01 periodically sends the discovery message by monitoring the discovery message sent by the second node U02, and when the first node U01 fails to detect the discovery message sent by the second node U02, the first node U01 considers that the radio link failure occurs in the first radio link.

As a sub-embodiment of the above embodiment, when the first node U01 fails to detect ACK or NACK for the first wireless signal, the first node U01 considers that a radio link failure occurs for the first wireless link.

As a sub-embodiment of the above embodiment, said first wireless link is a sidelink.

As a sub-embodiment of the above embodiment, the first wireless link is a wireless link between the first node U01 and the second node U02.

As a sub-embodiment of the above embodiment, the first wireless link is a direct unicast link (direct unicast link).

As a sub-embodiment of the above embodiment, the first node U01 detects the radio link failure of the first radio link after the first radio signal is transmitted.

As a sub-embodiment of the above embodiment, the first node U01 detects the radio link failure of the first radio link before the first radio signal is transmitted.

As a sub-embodiment of the foregoing embodiment, the first node U01 detecting that the first radio link failure is used to trigger the first node to enter an RRC idle state, and the first node entering the RRC idle state triggers the first node U01 to stop the first timer and the second timer.

As a sub-embodiment of the above embodiment, the sentence stopping the second timer includes meaning that the second timer is stopped if the second timer is in a running state.

As a sub-embodiment of the above embodiment, the sentence stopping the second timer includes a meaning that does not intervene in a stopped state of the second timer if the second timer is in the stopped state.

As a sub-embodiment of the above embodiment, the expiration of the second timer triggers the first node U01 to consider that the first radio link failure is detected.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: cell selection is performed and a suitable (able) cell is selected.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: cell selection is performed and an acceptable (acceptable) cell is selected.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: the cell selection is performed according to the S criteria, and a suitable (able) cell is selected.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: determining a first serving cell as a recipient of the third wireless signal.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: and determining a first service cell, and attempting to connect the first service cell by means of direct transmission.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: the cell identity of the first serving cell is determined by SIB1 system messages.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: selecting a first serving cell as a recipient of the third message.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: an RRC connection re-establishment is attempted (attempt) at the third node U03.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: attempting (attempt) RRC connection reestablishment on a cell other than the first serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: attempting (attempt) RRC connection reestablishment on the first serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: and selecting the first serving cell as a serving cell, and determining that the transmission mode of the first serving cell is direct transmission.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: and selecting a serving cell except the first serving cell as a serving cell, and determining the transmission mode of the serving cell except the first serving cell as direct transmission.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: the resessabelishmenticellid is set to the identity of the selected serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: and taking the first service cell as a target cell of the U01 RRC reconstruction of the first node.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: and taking a serving cell except the first serving cell as a target cell for the RRC reconstruction of the first node U01.

As a sub-embodiment of the above embodiment, the third node U03 is a serving cell selected by the first node U01 after the behavior execution selects the serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: and connecting the selected serving cell by selecting a direct transmission mode.

As an embodiment, expiration of the second timer triggers the first node U01 to perform selecting a serving cell.

As one embodiment, the second wireless signal is a physical layer signal.

As one embodiment, the second wireless signal is transmitted over a sidelink.

As an embodiment, the physical channel occupied by the second radio signal includes a pscch.

As an embodiment, the physical channel occupied by the second radio signal comprises a PSCCH.

As an embodiment, the reception of the second message triggers the first node U01 to stop the first timer.

As an embodiment, the reception of the second message triggers the first node U01 to stop the second timer.

As an embodiment, the receiving of the second message triggers the first node U01 to enter an RRC IDLE state, and the first node U01 entering the RRC IDLE state triggers the first node U01 to stop the first timer.

As an embodiment, the receiving of the second message triggers the first node U01 to enter an RRC IDLE state, and the first node U01 entering the RRC IDLE state triggers the first node U01 to stop the second timer.

As an embodiment, the RRC connection requested by the third message includes a newly established RRC connection and a re-established RRC connection.

In an embodiment, the second message triggers the first node U01 to enter an RRC idle state, and the third message is an RRCSetupRequest.

As an embodiment, the second message triggers the first node U01 to enter an RRC idle state, and the third message is RRCConnectionSetupRequest.

As an embodiment, the second message triggers the first node U01 to perform relay reselection as part of selecting a serving cell, and the third message is rrcreestablshmentirequest.

As an embodiment, the second message triggers the first node U01 to perform relay reselection as part of selecting a serving cell, and the third message is rrcconnectionrequestablistensionrequest.

As one embodiment, the fourth wireless signal is a physical layer signal.

As an embodiment, the fourth wireless signal is transmitted through a sidelink.

As an embodiment, the Physical Channel occupied by the fourth wireless signal includes a PDSCH (Physical Downlink Shared Channel).

As an embodiment, the Physical Channel occupied by the fourth wireless signal includes a PDCCH (Physical Downlink Control Channel).

As an embodiment, the fourth wireless signal and the third wireless signal use the same transmission mode, and the transmission mode includes transmission by relay and direct transmission.

As an embodiment, the fourth wireless signal and the third wireless signal use different transmission methods, and the transmission methods include transmission by relay and direct transmission.

For one embodiment, the fourth message comprises a RRCSetup.

For one embodiment, the fourth message includes rrcreelease.

For one embodiment, the fourth message includes RRCReject.

For one embodiment, the fourth message includes rrcreestablistering.

For one embodiment, the fourth message comprises RRConnectionSetup.

For one embodiment, the fourth message includes RRCConnectionReestablishment.

For one embodiment, when the third message is rrcreestablstringrequest, the fourth message includes rrcreestablstringrequest.

As an embodiment, when the third message is RRCReestablishmentRequest, the fourth message includes RRCReject.

As an embodiment, when the third message is a RRCSetupRequest, the fourth message includes a RRCSetup.

As an embodiment, when the third message is a RRCSetupRequest, the fourth message includes rrcreelease.

As an embodiment, when the third message is a RRCSetupRequest, the fourth message includes a RRCReject.

As an embodiment, the first node U01 stops the first timer in response to receiving the fourth message.

As an embodiment, the first node U01 stops the second timer in response to receiving the fourth message.

As an embodiment, the fourth message triggers the first node U01 to enter an RRC idle state, and in response to entering the RRC idle state, the first node U01 stops the first timer.

As an embodiment, the fourth message triggers the first node U01 to enter an RRC idle state, and in response to entering the RRC idle state, the first node U01 stops the second timer.

Example 6

Embodiment 6 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in fig. 6. In fig. 6, U11 corresponds to the first node of the present application, and it is specifically illustrated that the sequence in the present example does not limit the sequence of signal transmission and the sequence of implementation in the present application; wherein the steps in F61, F62, F63 are optional; example 6 is based on example 5, and the parts required but not described in example 6 can be referred to in example 5.

For theFirst node U11Receiving a first discovery signal in step S6101; transmitting a first wireless signal in step S6102; receiving a second wireless signal in step S6103; transmitting a third wireless signal in step S6104; in step S6105, a fourth wireless signal is received.

ForSecond node U12Transmitting a first discovery signal in step S6201; receiving a first wireless signal in step S6202; a second wireless signal is transmitted in step S6203.

For theThird node U13Receiving a 3a wireless signal in step S6301; a 4 a-th wireless signal is transmitted in step S6302.

ForFourth node U14Receiving a third wireless signal in step S6401; transmitting a 3a wireless signal in step S6402; receiving a 4a wireless signal in step S6403; the fourth wireless signal is transmitted in step S6404.

As an embodiment, the second node U12 is a relay for said first node U11.

As an embodiment, the first node U11 selects a first serving cell, and determines that a transmission mode to the first serving cell is relay transmission.

As a sub-embodiment of the above embodiment, the relay transmitted by the relay is the second node U12.

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

As an embodiment, the first node U12 is a UE.

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

As an embodiment, the third node U13 is a group of serving cells.

As an embodiment, the third node U13 is a base station.

As an embodiment, the third node U13 is a primary serving cell.

As an embodiment, the third node U13 is the first serving cell.

As an embodiment, the second node U12 resides in the first serving cell.

As an embodiment, an RRC connection exists between the second node U12 and the first serving cell.

As an embodiment, the second message is used to trigger the first node U11 to perform relay selection or relay reselection.

As an embodiment, the second message is used to trigger the first node U11 to perform the selection of the serving cell and the transmission mode to the selected serving cell.

As an embodiment, the second message is used to trigger the first node U11 to perform selecting a serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: a relay selection is performed.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: performing relay selection, the selected relay residing in the first serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: performing relay selection, the selected relay residing in a serving cell other than the first serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: selecting a second node U12, wherein the second node U12 is a relay of the first node U12, and the second node U12 has RRC connection with the first serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: selecting a second node U12, the second node U12 being a relay for the first node U11, the PCell of the second node U12 being the first serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: and selecting a serving cell according to the PLMN identity and the identity of the serving cell included in the first discovery message.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell comprises: and selecting the serving cell according to the PLMN identity and the identity of the serving cell included in the discovery message sent by the relay node.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: a second node U12 is selected, the discovery message (discovery message) sent by the second node U12 comprising the identity of the first serving cell.

As a sub-embodiment of the above embodiment, the behavior selecting a serving cell includes: and selecting to connect the selected serving cell by using a relay transmission mode.

As an embodiment, said fourth node U14 is a UE.

As an embodiment, the fourth node U14 is a relay.

For one embodiment, the fourth node U14 is a relay of the first node U11.

As an embodiment, after receiving the second message, the fourth node U14 is determined to be a relay.

As an embodiment, after receiving the second message, the transmission mode from the first node U11 to the third node U13 is determined to be relay transmission through the fourth node U14.

As an embodiment, the discovery message sent by the fourth node U14 includes the cell identity of the third node U13.

As an embodiment, the discovery message issued by the fourth node U14 includes the PLMN identity to which the third node U13 belongs or indicates.

For one embodiment, the fourth node U14 resides at the third node U13.

As an embodiment, the fourth node U14 has an RRC connection with the third node U13.

As an embodiment, the third node U13 is the first serving cell.

As an embodiment, the third node U13 is a serving cell other than the first serving cell.

As an embodiment, the fourth node U14 is a node other than the second node U12.

As an embodiment, the fourth node U14 belongs to the same group as the second node U12 and the first node U11.

As one embodiment, the third wireless signal is transmitted over a sidelink.

As an embodiment, the physical channel occupied by the third radio signal includes a PSSCH.

As an embodiment, the physical channel occupied by the third radio signal comprises a PSCCH.

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

For one embodiment, the third message comprises a PC5-S message.

As one embodiment, the third wireless signal is used to generate the 3a wireless signal.

As an embodiment, the third wireless signal is used to trigger the 3rd wireless signal.

As an embodiment, the physical channel occupied by the 3rd wireless signal is PUSCH.

As an embodiment, the 3 a-th wireless signal is an uplink wireless signal.

For one embodiment, the 3a wireless signal includes a 3a message.

As a sub-embodiment of the above embodiment, the 3a message is the same as the third message.

As a sub-embodiment of the above embodiment, the 3a message is different from the third message.

As a sub-embodiment of the above embodiment, the 3a message is different from the third message, the 3a message is an RRC message, and the third message is a PC5-S message.

As a sub-embodiment of the above embodiment, the 3a message is different from the third message, the 3a message is an RRC message, and the third message is a PC5-RRC message.

As a sub-embodiment of the above embodiment, the 3a message is different from the third message, and the 3a message is generated by a domain included in the third message.

As a sub-embodiment of the above embodiment, the 3a message is different from the third message, the 3a message does not use encryption or is not encrypted; the third message uses encryption or is encrypted.

As a sub-embodiment of the above embodiment, the 3a message includes an RRCSetupRequest.

As a sub-embodiment of the above embodiment, the 3a message includes rrcreestablishrequest.

As a sub-embodiment of the above embodiment, the 3a message comprises a RRCResumeRequest.

As a sub-embodiment of the above embodiment, the 3a message includes RRCResumeRequest1.

As a sub-embodiment of the above embodiment, the 3a message is used to request RRC connection of the first node U11.

As a sub-embodiment of the above embodiment, the 3a message is used to request an RRC connection between the first node U11 and the third node U13.

As an embodiment, the physical channel occupied by the 4a wireless signal is a PDSCH.

As an embodiment, the physical channel occupied by the 4a wireless signal is a PDCCH.

As an embodiment, the 4a wireless signal is a downlink wireless signal.

For one embodiment, the 4a wireless signal comprises a 4a message.

As an embodiment, the 3a message triggers the 4a message.

As an embodiment, the 4a message is used for feeding back the 3a message.

As an embodiment, the 4a message is used to agree or confirm the RRC connection of the first node U11 requested by the 3a message.

For one embodiment, the 4a message includes an RRCSetup.

For one embodiment, the 4a message includes rrcreestablistering.

For one embodiment, the 4a message includes a RRCReject.

As an embodiment, the 4a message includes rrcreelease.

As an embodiment, the fourth message is identical to the 4a message.

As an embodiment, the 4a message is used to generate the fourth message.

As an embodiment, the fourth message is used to grant or confirm the request of the third message.

For one embodiment, the fourth node U14 forwards the 4 th a message via the fourth wireless signal.

As an embodiment, the reception of the second message is used to trigger the stopping of the second timer.

As an embodiment, the reception of the second message is used to trigger the transmission of the third wireless signal.

As an embodiment, the above method has the advantages that the second timer is terminated early, which is beneficial for the first node to quickly reinitiate RRC reestablishment or initiate RRC establishment request, thereby saving time and reducing interruption.

As an embodiment, the first message is an nth RRC reestablishment request attempt initiated by the first node U11 during the first timer, where N is greater than 1, and the serving cells for the N RRC reestablishment request attempts are all the first serving cell; the transmission mode of the N times of RRC reestablishment requests to the first service cell is through relay transmission.

As a sub-embodiment of the above embodiment, the third node U13 is the first serving cell.

As a sub-embodiment of the above embodiment, said N is equal to 2.

As a sub-embodiment of the above embodiment, said N is equal to 4.

As a sub-embodiment of the above embodiment, the N is configurable.

As a sub-embodiment of the above embodiment, the first message includes rrcreestableblementrequest, and the first node U11 sends rrcreestableblementrequest at least N-1 times before sending the first message and during the running period before expiring or stopping after the first timer starts.

As a sub-embodiment of the above embodiment, the RRC reestablishment requests sent N-1 times before sending the first message are all relayed through the second node U12.

As a sub-embodiment of the above embodiment, the RRC reestablishment request sent N-1 times before sending the first message is relayed through the second node U12 and at least one node other than the second node U12.

As a sub-embodiment of the above embodiment, expiration of the second timer is used to trigger sending of the RRC reestablishment request.

As a sub-embodiment of the above embodiment, the N RRC reestablishment request attempts are for N different serving cells, respectively.

As a sub-embodiment of the above embodiment, the shortMAC-I included in the RRC reestablishment request message of any two times of the N RRC reestablishment request attempts is different.

For one embodiment, the second timer comprises T300.

For one embodiment, the second timer includes T319.

Example 7

Embodiment 7 illustrates a schematic diagram of a candidate node group according to an embodiment of the present application, as shown in fig. 7.

As an example, the first node in fig. 7 corresponds to the first node of the present application.

As an example, the third node in fig. 7 corresponds to the first serving cell of the present application.

As an embodiment, the second node and the fourth node in fig. 7 belong to a first candidate node group, and the second node and the fourth node are candidate relay nodes respectively.

As one embodiment, the first set of candidate nodes includes candidate relay nodes.

As an embodiment, the first node determines a transmission mode from the first node to the third node according to an internal algorithm, where the transmission mode includes one of transmission through relay and direct transmission.

As an embodiment, the first candidate node group includes K candidate nodes, two of which are the second node and the fourth node, K being a positive integer greater than 1.

As an embodiment, a node having the same group identity as the first node is determined as a candidate relay node.

As one embodiment, a node that has the same group identity as the first node and sends a discovery message and the sent discovery message indicates that a node that can receive relay traffic is determined to be a candidate relay node.

As one embodiment, a node that has the same group identity as the first node and sends a discovery message and the sent discovery message includes a relay traffic code is determined to be a candidate relay node.

As an embodiment, the serving cell of the first node configures the first candidate node group.

As one embodiment, the first node configures the first candidate node group in a serving cell before a radio link failure occurs.

As one embodiment, the serving cell to which the first node is connected prior to transmitting the first wireless signal configures the first candidate node group.

As an embodiment, the first node configures the first candidate node group for a serving cell for which the first node attempts an RRC re-establishment.

As an embodiment, the serving cell of the first node configures the first candidate node group by means of rrcreconconfiguration message.

As an embodiment, the serving cell of the first node configures the first candidate node group by means of an rrcreelease message.

As an embodiment, the nodes comprised within the first candidate node group are all UEs.

As an embodiment, the UEs comprised by the first candidate node group all camp on the first serving cell.

As an embodiment, any node included in the first candidate node group resides in the first serving cell or establishes an RRC connection with the first serving cell.

As an embodiment, whether a target recipient of the third wireless signal belongs to the first candidate group of nodes is used to determine whether the third message is for requesting establishment of an RRC connection or reestablishment of an RRC connection.

As one embodiment, the third message is a rrcreestablshmentirequest when the intended recipient of the third wireless signal belongs to the first candidate group of nodes.

As a sub-embodiment of the above embodiment, the third wireless signal is transmitted over a secondary link, the third wireless signal includes a third MAC PDU, the third MAC PDU includes a third MAC sub-PDU, the third MAC sub-PDU includes a third MAC sub-header, and a DST field of the third MAC sub-header indicates a target recipient of the third wireless signal.

As one embodiment, the third message is an RRCSetupRequest when the target recipient of the third wireless signal belongs to the first candidate group of nodes.

As a sub-embodiment of the above embodiment, if the third wireless signal is transmitted through the main link, the target recipient of the third wireless signal does not belong to the first candidate node group.

As a sub-embodiment of the above embodiment, if the third wireless signal is transmitted through a PUSCH channel, the target recipient of the third wireless signal does not belong to the first candidate node group.

As a sub-embodiment of the above embodiment, the third wireless signal includes a third MAC PDU including a third MAC sub-header, a DST field of the third MAC sub-header indicating a target recipient of the third wireless signal.

For one embodiment, the first node establishes a direct link with at least one node in the first candidate group of nodes.

For one embodiment, the first node establishes direct links with more than one node in the first candidate node group.

For one embodiment, the first node establishes direct links with all nodes in the first candidate node group.

For one embodiment, the direct link comprises a direct unicast link.

As an embodiment, the first message is an nth RRC reestablishment request attempt initiated by the first node in one run at the first timer, where N is greater than 1, and the serving cells for the N RRC reestablishment request attempts are all the first serving cell; the transmission mode of the N times of RRC reestablishment requests to the first serving cell is relay transmission, and a relay used by the relay transmission belongs to the first candidate node group.

As an embodiment, any candidate node within the first candidate node group is associated with a priority for determining a relay in the first candidate node group.

As an embodiment, any candidate node within the first candidate node group sends information indicating a load strength for determining a relay from within the first candidate node group.

Example 8

Embodiment 8 illustrates a schematic diagram where a second message is used to determine that a first message was not successfully distributed according to an embodiment of the present application, as shown in fig. 8.

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

For one embodiment, the second message comprises a PC5-S message.

As an embodiment, the second message indicates that an interface or link transmitting the first message has failed.

As one embodiment, the second message indicates a radio link failure.

As an embodiment, the second message indicates a handover failure.

As an embodiment, the second message indicates an access failure.

As an embodiment, the second message indicates that access is blocked.

As an embodiment, the second message indicates that access is denied.

As an embodiment, the second message indicates that the RRC connection is released.

As an embodiment, the second message indicates that the RRC connection is suspended.

As one embodiment, the second message indicates an unknown error.

For one embodiment, the second message indicates that the first message was not successfully distributed.

As an embodiment, the second message indicates that the first serving cell is not suitable (unsuitable).

For one embodiment, the second message indicates that the compatibility check failed.

As an embodiment, the second message indicates that a radio bearer for transmitting the first message is released.

As one embodiment, the second message indicates a relay failure.

As an embodiment, the second message indicates that a direct unicast link (direct unicast link) is released.

As an embodiment, the second message indicates that the PC5 link is released.

For one embodiment, the second message includes a Direct link modification.

For one embodiment, the second message includes a Direct link release request.

For one embodiment, the second message includes a Direct link failure.

For one embodiment, the second message includes a Direct link failure indication.

As an embodiment, the second message includes a Direct link failure information.

For one embodiment, the second message includes a Direct link failure report.

For one embodiment, the second message indicates expiration of a fourth timer, which may determine that the first message was not properly distributed.

As an embodiment, the first node retransmits the first message in response to receiving the second message, and the second timer is restarted in response to transmitting the first message.

As an embodiment, in response to receiving the second message, the first node transmits an ith radio signal including an RRC reestablishment request message through the sidelink, and in response to transmitting the RRC reestablishment request message, the second timer is restarted.

As an embodiment, in response to receiving the second message, the first node reselects a relay node and transmits an ith radio signal over a sidelink, the ith radio signal including an RRC reestablishment request message, and in response to transmitting the RRC reestablishment request message, the second timer is restarted.

As an embodiment, the second message is sent by means of unicast.

Example 9

Embodiment 9 illustrates a schematic diagram where a second message is used to trigger reselection of a relay according to an embodiment of the present application, as shown in fig. 9.

As one embodiment, the second message indicates that a sender of the second message is handed off.

As a sub-embodiment of the above embodiment, the sender of the second message is a relay of the first node.

As a sub-embodiment of the above embodiment, the sender of the second message is the sender of the second wireless signal.

As a sub-embodiment of the above embodiment, the sender of the second message is the second node.

As a sub-embodiment of the above embodiment, the sender of the second message is a node within the first candidate node group in embodiment 7.

As a sub-embodiment of the above embodiment, the sender of the second message resides in the first serving cell.

As a sub-embodiment of the above embodiment, there is an RRC connection between the sender of the second message and the first serving cell.

As a sub-embodiment of the above embodiment, the PCell of the sender of the second message is the first serving cell.

As a sub-embodiment of the above embodiment, the sender of the second message is the recipient of the first wireless signal.

As a sub-embodiment of the above embodiment, the second message indicates that a sender of the second message is handed.

As a sub-embodiment of the above embodiment, the second message indicates that the handover occurring by the sender of the second message is a conditional handover, and the conditional handover is implemented by conditional reconfiguration.

As a sub-embodiment of the above embodiment, the second message indicates that a handover occurs to a sender of the second message, and triggers the first node to perform relay reselection or reselect a relay.

As an embodiment, the second message indicates that a serving cell of a sender of the second message has changed.

As a sub-embodiment of the above embodiment, the second message indicates that the PCell of the sender of the second message is changed.

As a sub-embodiment of the above embodiment, the second message indicates that the MCG of the sender of the second message has changed.

As a sub-embodiment of the above embodiment, the second message indicates that the sender of the second message performed reconfigwithSync.

As a sub-embodiment of the above embodiment, the second message indicates that the camped cell of the sender of the second message has changed.

As a sub-embodiment of the above embodiment, the second message indicates that a sender of the second message performed cell reselection.

As a sub-embodiment of the above embodiment, the second message indicates that the serving cell of the sender of the second message changes, triggering the first node to perform relay reselection or reselect a relay.

As an embodiment, the time-frequency resource occupied by the second message is used to indicate that the sender of the second message is performing handover.

As a sub-embodiment of the above embodiment, the second message comprises a discovery message.

As a sub-embodiment of the above embodiment, the second message occupies resources within an explicit pool.

As a sub-embodiment of the above embodiment, the time-frequency resource occupied by the second message can only be used when performing handover.

As a sub-embodiment of the above embodiment, the time-frequency resource occupied by the second message can only be used when random access is performed.

As an embodiment, the second message includes a discovery message, the second message indicates a cell in which a sender of the second message resides, and the resident cell of the sender of the second message indicated by the second message changes, triggering the first node to perform relay reselection or reselect a relay.

As an embodiment, the second message includes a discovery message, the second message indicates a current serving cell of a sender of the second message, and the current serving cell of the sender of the second message indicated by the second message changes, triggering the first node to perform relay reselection or reselect a relay.

As an embodiment, the first node selects relaying according to the strength of signals transmitted by different relay nodes.

As an embodiment, the first node is based on the identity of the serving cell of signals transmitted by different relay nodes.

As an embodiment, the first node is based on priorities of different relay nodes.

As an embodiment, the first node belongs to the same group according to whether different relay nodes belong to the same group.

As an embodiment, the first node is dependent on whether a different relay node belongs to the first candidate node group.

As one embodiment, the first node reselects a relay according to an internal algorithm.

As an embodiment, after relay selection or reselection, the relay selected by the first node is the sender of the second message.

As an embodiment, after relay selection or re-selection of a relay, the relay selected by the first node is a node other than the sender of the second message.

As an embodiment, after relay selection or relay reselection, the relay selected by the first node is the fourth node in embodiment 6.

For one embodiment, the reselection relay includes at least one of a cell selection or a relay selection.

Example 10

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

a first transmitter 1002 that starts a first timer; selecting a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer in conjunction with sending the first message; operating the first timer in accordance with a transmission mode to at least the first serving cell; transmitting a third wireless signal, the third wireless signal comprising a third message, the third message for requesting an RRC connection;

For one embodiment, the first transmitter 1002, starts a first timer; selecting a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer in conjunction with sending the first message; operating the first timer in accordance with a transmission mode to at least the first serving cell; transmitting a third wireless signal, the third wireless signal comprising a third message, the third message for requesting an RRC connection;

wherein expiration of the first timer is used to trigger the first node to enter an RRC idle state; the act of operating the first timer in accordance with a transmission mode to at least the first serving cell comprises: when the transmission mode to the first serving cell is through relay transmission, continuing to run the first timer after the behavior selects the first serving cell; stopping the first timer in response to selecting the first serving cell when the transmission mode to the first serving cell is direct transmission.

For one embodiment, the first receiver 1001 receives a second wireless signal, the second wireless signal including a second message, the second message being used to determine that the first message was not successfully distributed.

For one embodiment, the second message is used to trigger the first transmitter 1002 to stop the first timer and the second timer, and the first node enters an RRC idle state;

For one embodiment, the second message is used to trigger the first transmitter 1002 to restart the second timer and send the third message; the third message is used to request RRC reestablishment.

For one embodiment, the first receiver 1001 receives a fourth wireless signal, where the fourth wireless signal includes a fourth message, and the fourth message is used for feeding back the third message;

the fourth message is used to trigger the first transmitter 1002 to stop the first timer and the second timer.

As an embodiment, the second message is used to trigger reselection of a relay.

For one embodiment, the first receiver 1001 detects a failure of a first radio link, and the first radio signal is transmitted through the first radio link;

in response to detecting the failure of the first radio link, the first receiver 1001 stops the second timer and performs selection of a serving cell.

As an embodiment, the first receiver 1001 receives a first discovery signal, which is used to indicate a first serving cell; the act of selecting a first serving cell comprises selecting a sender of the first discovery signal as a relay.

As an embodiment, the first message is an nth RRC reestablishment request attempt initiated by the first timer in operation by the first transmitter 1002, where N is greater than 1, and the serving cells for the N RRC reestablishment request attempts are all the first serving cell; the transmission mode of the N times of RRC reestablishment requests to the first service cell is through relay transmission.

As an example, the first transmitter 1002, selects a first serving cell; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer in conjunction with sending the first message;

wherein the transmission mode from the first node to the first serving cell is through a first relay transmission, and a first timer is started as a response to selecting the first relay; the first relay is an L2U 2N relay; expiration of the first timer is used to trigger the first node to enter an RRC idle state.

As an embodiment, the behavior selecting the first serving cell includes performing relay selection and finding a suitable L2U 2N relay, i.e. the first relay; the first serving cell is a serving cell of the first relay.

As a sub-embodiment of this embodiment, when the first relay is in an RRC connected state, the first serving cell is a primary cell of the first relay.

As an embodiment, the transmitting through the indirect path is that data transmission between the first node and the network is forwarded through a relay; the direct path is such that data transmission between the first node and the network does not pass through a relay.

As an example, the first transmitter 1002, selects the first relay; transmitting a first wireless signal, wherein the first wireless signal comprises a first message, and the first message is used for requesting RRC reestablishment; starting a second timer with the sending of the first message;

the first transmitter 1002, after the second timer expires, restarts the second timer; transmitting a third radio signal accompanying the restarting of the second timer, the third radio signal including a third message, the third message requesting an RRC connection;

wherein the first relay is an L2U 2N relay.

As an embodiment, the first timer is stopped in response to selecting the first relay.

As an embodiment, the first message belongs to a first RRC reestablishment procedure, and the initiation of the first RRC reestablishment procedure triggers the start of the first timer.

For one embodiment, the phrase that the second timer expires is for the action to start a second timer.

As an embodiment, expiration of the second timer triggers the first node to perform relay selection and the first node discovers a suitable relay.

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

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

As a sub-embodiment of this embodiment, the suitable relay is not the first relay.

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

For one embodiment, expiration of the first timer is used to trigger the first node to enter an RRC idle state.

As an embodiment, the actions of starting the second timer and restarting the second timer both belong to the first RRC reestablishment procedure.

As an example, the first relay is a suitable L2U 2N relay.

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

As an embodiment, the first receiver 1001 receives a first configuration message, where the first configuration message is used to configure the second timer.

As a sub-embodiment of this embodiment, the phrase configuring the second timer includes configuring a number of times the second timer can be restarted in one RRC reestablishment process.

As a sub-embodiment of this embodiment, the number of times that the second timer can be restarted in one RRC reestablishment procedure is greater than 0.

As a sub-embodiment of this embodiment, the number of times that the second timer can be restarted in one RRC reestablishment procedure is greater than 1.

As a sub-embodiment of this embodiment, the number of times the second timer can be restarted in one RRC reestablishment procedure is equal to 1.

As a sub-embodiment of this embodiment, the number of times the second timer can be restarted in one RRC reestablishment procedure is equal to 2.

As a sub-embodiment of this embodiment, the number of times the second timer can be restarted in one RRC reestablishment procedure is limited.

As a sub-embodiment of this embodiment, the number of times the second timer can be restarted in one RRC reestablishment process is unlimited.

As a sub-embodiment of this embodiment, the expiration of the last restart of the second timer in one RRC reestablishment procedure triggers the first node to enter an RRC idle state.

For one embodiment, the first configuration message includes a system information block.

As an embodiment, the first configuration message is an RRC message.

As an embodiment, the first configuration message is or comprises rrcreconconfiguration.

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

As an embodiment, the first timer is not T301.

As an embodiment, the first timer is not T311.

As an embodiment, the first timer is T311.

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

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

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

As an embodiment, the first node is an aircraft.

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

As an embodiment, the first node is a relay.

As an embodiment, the first node is a ship.

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

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

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

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

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

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

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

Claims

1. A first node to be used for wireless communication, comprising:

2. The first node of claim 1, comprising:

a first receiver to receive a second wireless signal, the second wireless signal comprising a second message used to determine that the first message was not successfully distributed.

3. The first node of claim 2,

the second message is used to trigger the first transmitter to stop the first timer and the second timer, the first node entering an RRC idle state;

4. The first node of claim 2, comprising:

the second message is used to trigger the first transmitter to restart the second timer and send the third message; the third message is used to request RRC reestablishment.

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

the first receiver is configured to receive a fourth wireless signal, where the fourth wireless signal includes a fourth message, and the fourth message is used for feeding back the third message;

in response to receiving the fourth message, the first transmitter stops the first timer and the second timer.

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

the second message is used to trigger a reselection of a relay.

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

the first receiver detects that a first wireless link fails, and the first wireless signal is sent through the first wireless link;

in response to detecting the first radio link failure, the first receiver stops the second timer and performs selecting a serving cell.

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

the first receiver receiving a first discovery signal, the first discovery signal being used to indicate a first serving cell; the act of selecting a first serving cell includes selecting a sender of the first discovery signal as a relay.

9. The first node according to any of claims 1 to 8,

the first message is an N RRC reestablishment request attempt initiated by the first transmitter during the operation by the first timer, where N is greater than 1, and all serving cells for which the N RRC reestablishment request attempts are intended are the first serving cell; the transmission mode of the N times of RRC reestablishment requests to the first service cell is through relay transmission.

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