CN114143912A

CN114143912A - Method, device and apparatus for reestablishing RRC connection, and storage medium

Info

Publication number: CN114143912A
Application number: CN202010923200.XA
Authority: CN
Inventors: 顾祥新; 邓云
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2022-03-04

Abstract

The embodiment of the invention provides a method, equipment, a device and a storage medium for reestablishing RRC connection, wherein the method for reestablishing the RRC connection by user equipment comprises the following steps: acquiring a C-RNTI; determining that a link of a user equipment is in an RLF state; and sending an RRC reestablishment request to the network equipment, wherein the RRC reestablishment request comprises an equipment information field indicating whether the user equipment is the remote user equipment or the non-remote user equipment. In the technical scheme of the embodiment of the invention, the C-RNTI can be multiplexed by the remote UE and the non-remote UE, thereby saving C-RNTI resources.

Description

Method, device and apparatus for reestablishing RRC connection, and storage medium

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method, an apparatus, a device, and a storage medium for reestablishing an RRC connection.

Background

The third Generation Partnership Project (3 GPP) introduced a sidelink (sidelink) communication technology, where a User Equipment (UE) includes a remote UE (remote UE) and a non-remote UE, and the non-remote UE includes a relay UE (relay UE), and the remote UE establishes a PC5sidelink (PC5 sidelink) with the relay UE through a PC5 interface, and then accesses to a network device through the relay UE.

There are two modes in which the remote UE accesses the Network device through the Relay UE, namely, a Layer 2UE-to-Network Relay mode (Layer 2UE-to-Network Relay) and a Layer 3UE-to-UE Relay mode (Layer 3UE-to-UE Relay). In the layer two relay mode, RRC connection is directly established between the remote UE and the Network device, so that the remote UE enters an RRC _ CONNECTED state after accessing the Network through the relay UE, and is allocated a Radio Network Temporary Identifier (C-RNTI); in the layer three relay mode, the remote UE establishes a PC5 connection with the relay UE without directly establishing an RRC connection with the network device.

In scenarios of a large number of UE applications, such as Internet of Things (IOT), many remote UEs access the network device through the relay UE, but in layer two relay mode, there may not be enough C-RNTIs allocated to remote UEs entering the connected state.

Disclosure of Invention

An object of the embodiments of the present invention is to provide a method, device, apparatus, and storage medium for reestablishing an RRC connection.

The embodiment of the invention provides a method for reestablishing RRC connection by user equipment, wherein the user equipment comprises side link far-end user equipment and non-side link far-end user equipment, and the method comprises the following steps: s110, acquiring a C-RNTI; s120, determining that the link of the user equipment is in an RLF state; s130, sending an RRC reestablishment request to the network device, where the RRC reestablishment request includes a device information field indicating whether the user equipment is the edge link remote user equipment or the non-edge link remote user equipment.

Optionally, the method for the user equipment to reestablish the RRC connection further includes: s120 includes determining that the PC5side link of the user equipment is in the RLF state; s130 includes sending an RRC reestablishment request to the network device, where the device information field indicates that the user equipment is the sidelink remote user equipment.

Optionally, the method for the user equipment to reestablish the RRC connection further includes: s120 includes determining that the Uu link of the user equipment is in an RLF state; s130 includes sending an RRC reestablishment request to the network device, where the device information field indicates that the user equipment is a non-sidelink remote user equipment.

Optionally, the device information field includes a spare bit in the RRC reestablishment request, which is set to one of 0 and 1 to indicate that the user equipment is the edge link remote user equipment, and the other to indicate that the user equipment is the non-edge link remote user equipment.

Optionally, the device information field includes an extension field including a layer two identifier of the edge link relay user equipment, which indicates that the user equipment is the edge link remote user equipment.

The embodiment of the invention also provides the user equipment, which comprises a memory and a processor, wherein the memory is stored with a computer instruction capable of running on the processor, and the step of the user equipment for rebuilding the RRC connection method is executed when the processor runs the computer instruction.

The embodiment of the invention also provides a storage medium, wherein a computer instruction is stored on the storage medium, and the computer instruction executes the step of the method for reestablishing the RRC connection by the user equipment when running.

An embodiment of the present invention further provides a user equipment, including: a first obtaining module adapted to obtain a C-RNTI; a first determining module adapted to determine that a link of a user equipment is in an RLF state; a sending module adapted to send an RRC reestablishment request to the network device, wherein the RRC reestablishment request includes a device information field indicating whether the user equipment is an edge link remote user equipment or a non-edge link remote user equipment.

Optionally, the user device further includes: the first determining module is adapted to determine that the PC5side link of the user equipment is in RLF state; the sending module is adapted to send an RRC reestablishment request to the network device, where the device information field indicates that the user equipment is a sidelink remote user equipment.

Optionally, the user device further includes: the first determining module is adapted to determine that a Uu link of the user equipment is in an RLF state; the sending module is adapted to send an RRC reestablishment request to the network device, where the device information field indicates that the user equipment is a non-sidelink remote user equipment.

Optionally, the device information field includes a spare bit in the RRC reestablishment request, which is adapted to be set to one of 0 and 1 to indicate that the user equipment is the edge link remote user equipment, and the other to indicate that the user equipment is the non-edge link remote user equipment.

The embodiment of the invention also provides a method for reestablishing RRC connection by network equipment, which comprises the following steps: allocating C-RNTI to user equipment, wherein the user equipment comprises side link far-end user equipment and non-side link far-end user equipment, and the C-RNTI can be multiplexed by the side link far-end user equipment and the non-side link far-end user equipment; receiving an RRC reestablishment request sent by user equipment; acquiring an equipment information field in an RRC reestablishment request; and determining whether the user equipment is the side link far-end user equipment or the non-side link far-end user equipment based on the information of the equipment information field.

Optionally, the device information field includes spare bits, and the method includes: and if the spare bit is one of 0 and 1, determining that the user equipment is the side link far-end user equipment, and if the spare bit is the other one of 0 and 1, determining that the user equipment is the non-side link far-end user equipment.

Optionally, the device information field includes an extension field including a layer two identifier of the edge link relay user equipment, and the method includes: and if the equipment information field does not comprise the layer two identification, the user equipment is determined to be the non-edge link far-end user equipment.

Optionally, the method for the network device to reestablish the RRC connection further includes: obtaining a PCI and a C-RNTI corresponding to the user equipment from the RRC reestablishment request; based on PCI, C-RNTI and user equipment information determined by the equipment information field, communicating with the original network equipment, wherein the original network equipment is the network equipment with which the user equipment establishes RRC connection for the last time before the occurrence of PC5side link RLF or Uu link RLF; acquiring configuration information and/or capability information of user equipment, which is obtained based on PCI, C-RNTI and user equipment information, from original network equipment; establishing an RRC connection with the user equipment based on the configuration information and/or the capability information.

The embodiment of the invention also provides network equipment, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the step of rebuilding the RRC connection method of the network equipment when running the computer instructions.

The embodiment of the invention also provides a storage medium, wherein the storage medium is stored with computer instructions, and the computer instructions execute the steps of the method for reestablishing the RRC connection by the network equipment when running.

An embodiment of the present invention further provides a network device, including: the allocation module is suitable for allocating C-RNTIs to user equipment, the user equipment comprises side link far-end user equipment and non-side link far-end user equipment, and the C-RNTIs can be multiplexed by the side link far-end user equipment and the non-side link far-end user equipment; a receiving module, adapted to receive an RRC reestablishment request sent by a user equipment; a second obtaining module, adapted to obtain a device information field in the RRC reestablishment request; a second determination module adapted to determine whether the user equipment is a side link remote user equipment or a non-side link remote user equipment based on the information of the device information field.

Optionally, the device information field comprises a spare bit, and the network apparatus comprises a third determining module adapted to determine that the user equipment is a sidelink remote user equipment if the spare bit is one of 0 and 1, and that the user equipment is a non-sidelink remote user equipment if the spare bit is the other.

Optionally, the device information field includes an extension field including a layer two identifier for the edge link relay user equipment, and the network apparatus includes a fourth determining module adapted to determine that the user equipment is the edge link remote user equipment if the device information field includes the layer two identifier and determine that the user equipment is the non-edge link remote user equipment if the device information field does not include the layer two identifier.

Optionally, the network device includes: a third obtaining module, adapted to obtain the PCI and C-RNTI corresponding to the user equipment from the RRC reestablishment request; a first connection module adapted to communicate with an original network device based on the PCI, C-RNTI and user equipment information determined by the device information field, the original network device being the network device with which the user equipment most recently established an RRC connection prior to the occurrence of the PC5side link RLF or Uu link RLF; a fourth obtaining module, adapted to obtain configuration information and/or capability information of the user equipment from the original network equipment; a second connection module adapted to establish an RRC connection with the user equipment based on the configuration information and/or the capability information.

Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effects that the C-RNTI is multiplexed by the remote UE and the non-remote UE, so that the C-RNTI resource is saved.

Drawings

FIG. 1 is a flowchart illustrating a UE reestablishing RRC connection according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a communication system in an embodiment of the present invention;

FIG. 3 is a diagram illustrating RRC connection reestablishment according to a first embodiment of the present invention;

FIG. 4 is a diagram illustrating RRC connection reestablishment according to a second embodiment of the present invention;

FIG. 5 is a diagram illustrating a structure of a user equipment according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a network device reestablishing RRC connection according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present invention.

Detailed Description

In an embodiment of the present invention, a layer two relay mode is used. In the layer two relay mode, although the network device does not need to schedule the radio air interface resource of the remote UE through the C-RNTI, the network device may still allocate the C-RNTI to the remote UE in the embodiment of the present invention. The related data (such as capability information, the capability information includes a frequency band and a transmission power supported by the UE) of the remote UE in a connected state may be indexed by the C-RNTI, mobility management such as UE handover may be performed by the C-RNTI, and the remote UE may reestablish RRC connection with the network device by the C-RNTI after a PC5sidelink Radio Link Failure (RLF) occurs.

In the embodiment of the invention, the network equipment can allocate the C-RNTI to the UE, and the C-RNTI is multiplexed by the remote UE and the non-remote UE, for example, one C-RNTI is allocated to both the remote UE and the non-remote UE, so that in the scene of application of a large number of remote UEs such as IOT, the remote UEs occupy C-RNTI resources without influencing C-RNTI resources of the non-remote user equipment, the larger change brought to a 3GPP protocol by expanding the C-RNTI (for example, expanding the C-RNTI from 16bit to 24bit) is avoided, the complex implementation process at the network equipment and the UE is avoided, and the upgrading of a large number of existing network equipment and UE is also avoided.

In the case that the C-RNTI is multiplexed by the remote UE and the non-remote UE, after RLF (e.g. PC5sidelink RLF, Uu RLF) occurs, the UE sends a message of RRC reestablishment request (e.g. rrcreetablshmentirerequest) to the network device, the network device parses the message and can obtain the C-RNTI, and since the C-RNTI is multiplexed by the remote UE and the non-remote UE, the network device cannot determine whether the RRC reestablishment request is from the remote UE or the non-remote UE according to the C-RNTI.

In the embodiment of the present invention, after the RLF occurs, the message that the UE sends the RRC reestablishment request to the network device may include a device information field indicating whether the UE is a remote UE or a non-remote UE.

In the embodiment of the present invention, each technical solution may be applied to a 3G system, a 4G system, a 5G system, and a system such as a Public Land Mobile Network (PLMN) for future evolution, where the 5G system includes two types of networks, namely, a Non-independent Network (NSA) and an independent Network (SA).

In an embodiment of the present invention, the UE may be an access Terminal, a subscriber unit, a subscriber Station, a Mobile Station (Mobile Station, MS), a remote Station, a remote Terminal, a Mobile device, a user Terminal, a Terminal device (Terminal Equipment), a wireless communication device, or a user agent; the UE may also be a cellular phone, a cordless phone, a Session Initiation Protocol (IP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a UE in a future 5G network or a UE in a future evolved PLMN, etc.

In an embodiment of the present invention, the Network device may be an apparatus deployed in a Radio Access Network (RAN) to provide a Wireless communication function, including but not limited to a device providing a base station function in a 3G, 4G, 5G system and a PLMN system evolved in the future, for example, a device providing a base station function in a 3G Network includes a node B (NodeB), a device providing a base station function in a 4G Network includes an evolved node B (eNB), a device providing a base station function in a Wireless Local Area Network (WLAN) (i.e., an Access Point, AP), a device providing a base station function in a 5G NR, a gNB (ng-eNB), and the like.

In an embodiment of the present invention, the Processor may be a Central Processing Unit (CPU), and the Processor may also be other general purpose processors, Digital Signal Processors (DSP), Application Specific Integrated Circuits (ASIC), Field Programmable Gate Arrays (FPGA), other Programmable logic devices, discrete Gate or transistor logic devices, or discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In embodiments of the invention, the memory may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous dynamic random access memory (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct memory bus RAM (DR | RAM).

In the embodiment of the present invention, the storage medium includes various media that can store program codes, such as a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

In the embodiments of the present invention, the apparatus embodiments are merely schematic, for example, the division of the modules is only one logical function division, and there may be other division manners in actual implementation. The module may be stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network-connected device) to perform steps of a method associated with embodiments of the present invention.

In order to make the objects, features and advantages of the embodiments of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings.

As shown in fig. 1, an embodiment of the present invention provides a method 100 for a UE to reestablish an RRC connection, where the method may include:

s110, acquiring a C-RNTI;

s120, determining that the link of the UE is in an RLF state;

s130, sending an RRC reestablishment request to the network device, where the RRC reestablishment request includes a device information field indicating whether the UE is a remote UE or a non-remote UE.

The method 100 relates to a network device and a UE, the UE including a non-remote UE (may be referred to as a non-sidelink remote UE) including a relay UE (may be referred to as an sidelink relay UE) and a remote UE (may be referred to as a sidelink remote UE), the non-remote UE accessing the network device via a Uu link (uulink). The remote UE and the relay UE establish a PC5sidelink through a PC5 interface, the relay UE and the network equipment establish a Uu link through a Uu interface, and the remote UE is accessed to the network equipment through the PC5sidelink and the Uu link between the relay UE and the network equipment.

As shown in fig. 2, the system 200 includes a network device 201 and connected UEs, which include

non-remote UEs

211, 212 and a remote UE 213, wherein the non-remote UE 212 may act as a relay UE for the remote UE 213. The

non-remote UEs

211, 212 are within the Coverage area (IC) of the network device and establish a connection with the network device 201 based on the Uu interface; the remote UE 213 may be in Or Out of Coverage (OOC) of the network device, and the remote UE 213 establishes a connection with the relay UE 212 based on the PC5 interface, and further connects to the network device 201 through the relay UE 212.

In the execution of step S110, the network device may allocate C-RNTI to the UE, for example, allocate C-RNTI to a non-remote UE (including a relay UE) through a uulink, and allocate C-RNTI to a remote UE through a uulink and a PC5 sidelink; the non-remote UE receives the allocation message sent by the network equipment through the uulink and acquires the C-RNTI, and the remote UE receives the allocation message sent by the network equipment through the uulink and the PC5sidelink and acquires the C-RNTI.

Specifically, since the network device can distinguish whether the accessed UE is a non-remote UE or a remote UE during the access process, the network device may allocate the C-RNTI allocated to the non-remote UE to the remote UE again, so that the C-RNTIs of at least a part of the remote UE are respectively the same as the C-RNTIs of at least a part of the non-remote UE, that is, one C-RNTI or each C-RNTI of a plurality of C-RNTIs is respectively multiplexed between the corresponding remote UE and the non-remote UE.

For example, in FIG. 2, the far-end UE 213 has the same C-RNTI as one of the non-far-end UE 211 and the non-far-end UE 212, while the other of the non-far-end UE 211 and the non-far-end UE 212 has a different C-RNTI 1.

In the execution of step S120, the UE may detect a link to which it is connected (e.g., uulink where the non-remote UE is connected to the network device, and PC5sidelink where the remote UE is connected to the relay UE), and when the link may fail, the UE may determine whether it is in the RLF state.

In the execution of step S130, if the UE determines that the link is in the RLF state, a message of an RRC reestablishment request (e.g., rrcreetablestablishrequest) may be sent to the network device, where the message may include a device information field indicating whether the UE is a far-end UE or a non-far-end UE.

For example, the UE sends an RRC reestablishment request including a device information field including a spare bit (spare bit) set to one of 0 and 1 to indicate that the UE is a far-end UE and the other to indicate that the UE is a non-far-end UE. The network equipment receives the message of the RRC reestablishment request, if the standby bit is one of 0 and 1, the UE is determined to be the remote UE, and if the standby bit is the other one of 0 and 1, the UE is determined to be the non-remote UE; if the spare bit is 1, the UE is determined to be the far-end UE, and if the spare bit is 0, the UE is determined to be the non-far-end UE.

For another example, the UE sends an RRC reestablishment request including a device information field including an extension field including a layer two identity (relay UE L2 ID) for the relay UE, which indicates that the UE is a remote UE. The network equipment receives the message of the RRC reestablishment request, if the equipment information field comprises the layer two identification, the UE is determined to be the far-end UE, and if the equipment information field does not comprise the layer two identification, the UE is determined to be the non-far-end UE.

For another example, the UE sends an RRC reestablishment request including the device information field, where the device information field is not included, for example, the RRC reestablishment request does not include the extension field and the spare bit of the RRC reestablishment request is not configured, and then the UE is determined to be a non-remote UE.

In some embodiments, if the UE determines that the PC5sidelink connected to the UE is in the RLF state, a message of an RRC reestablishment request is sent to the network device, and a device information field in the message indicates that the UE is a remote UE.

In other embodiments, if the UE determines that the uulink connected thereto is in the RLF state, a message of an RRC reestablishment request is sent to the network device, and a device information field in the message indicates that the UE is a non-remote UE.

A first embodiment of the invention is described below in connection with fig. 3.

As shown in fig. 3, the network 300 includes a network device 301 and a network device 302 adjacent to each other, and

UEs

311, 312, 313 in a connected state. The

non-remote UEs

311 and 312 are connected to the network device 301 through the Uu interface, the remote UE313 is located outside the coverage of the network device 301, and is connected to the non-remote UE 312 (i.e., relay UE) through the PC5 interface, so as to access the network device 301 through the non-remote UE 312.

The Cell of the network device 301 has a Physical Cell Identity (PCI), denoted PCI 1; the network device 301 stores related information of the

UEs

311, 312, 313, such as configuration information and capability information, where the configuration information may be bearer information or Quality of Service (QoS) information, and the capability information may be frequency bands or transmission power supported by the UEs.

The cell of network device 302 is shown as PCI 2.

The UE 311 is assigned the same C-RNTI (i.e., C-RNTI1) as the UE313, while the UE 312 is assigned a different C-RNTI (i.e., C-RNTI 2).

The remote UE313 gradually moves away from the relay UE 312 and the cell PCI1 of the network device 301 and moves towards the cell PCI2 of the network device 302, as illustrated by arrow 314. During the moving process, the sidelink where the remote UE313 and the relay UE 312 are connected has PC5sidelink RLF, and the remote UE313 sends a message of RRC reestablishment request to the network device 302. In this scenario, network device 301 may be referred to as an original network device and network device 302 may be referred to as a target network device.

The message of the RRC reestablishment request sent by the remote UE313 to the network device 302 includes a PCI field, a C-RNTI field, and a device information field. Wherein, the information of the PCI field indicates that the cell where the remote UE313 is located is PCI 1; the information of the C-RNTI field indicates that the C-RNTI of the remote UE313 is C-RNTI 1; the device information field may be a spare bit (which is set to one of 0 and 1 to indicate that the remote UE313 is a remote UE type) or an extended field (which includes a layer two identity for the relay UE 312 to indicate that the remote UE313 is a remote UE type).

The network device 302, upon receiving the RRC reestablishment request message, obtains the PCI1, the C-RNTI1 corresponding to the remote UE313, and the user equipment information determined by the device information field (which indicates that the remote UE313 is a remote UE type); the network device 302 then communicates with the network device 301 based on the PCI1, the C-RNTI1, and the user device information, e.g., the network device 302 establishes a connection with the network device 301 through the PCI1 and sends the C-RNTI1 and the user device information to the network device 301.

After receiving the C-RNTI1 and the user equipment information, the network device 301 can uniquely determine that the UE initiating the RRC reestablishment request is the remote UE 313; then, configuration information and/or capability information, etc. related to the remote UE313 are transmitted to the network device 302.

The network device 302 receives configuration information and/or capability information, etc. related to the remote UE313, transmitted by the network device 301, and establishes an RRC connection with the remote UE313 through the Uu interface based on the information.

The remote UE313 sends information of RRC connection setup completion to the network device 302 through the Uu interface after completing the RRC connection; at this time, the remote UE313 is a non-remote UE of the network device 302.

In the first embodiment, the remote UE313 establishes an RRC connection with the network device 302 over the Uu interface, it being understood that the first embodiment may be varied, wherein the remote UE313 may be connected to one of the non-remote UEs in the network device 302 over the PC5 interface, which acts as a relay UE to access the remote UE313 to the network device 302.

A second embodiment of the invention is described below in conjunction with fig. 4.

As shown in fig. 4, the network 400 includes a network device 401 and a network device 402 adjacent to each other, and

UEs

411, 412, 313 in a connected state. The

non-remote UEs

411, 412 are connected to the network device 401 through the Uu interface, and the remote UE 413 is located outside the coverage area of the network device 301, and is connected to the non-remote UE 412 (i.e., relay UE) through the PC5 interface, so as to access the network device 401 through the non-remote UE 412.

The physical cell identity of the network device 401 is denoted PCI 3; the network device 401 stores relevant information of the

UEs

411, 412, 413, such as configuration information and capability information, where the configuration information may be bearer information or QoS information, and the capability information may be frequency bands or transmission power supported by the UEs.

The cell of network device 402 is shown as PCI 4.

UE411 is assigned the same C-RNTI (i.e., C-RNTI3) as UE 413, while UE 412 is assigned a different C-RNTI (i.e., C-RNTI 4).

The non-remote UE411 gradually moves away from the cell PCI3 of the network device 401 and moves towards the cell PCI4 of the network device 402 (not shown), as illustrated by arrow 414. During the moving, the Uu link RLF occurs in the Uu link where the non-remote UE411 is connected to the network device 401, and the non-remote UE411 sends a message of RRC reestablishment request to the network device 402. In this scenario, network device 401 may be referred to as an original network device and network device 402 may be referred to as a target network device.

The message of the RRC reestablishment request issued by the non-remote UE411 to the network device 402 includes a PCI field, a C-RNTI field, and information related to the UE type. The information of the PCI field indicates that the cell in which the non-remote UE411 is located is PCI 3. The information of the C-RNTI field indicates that the C-RNTI that the non-remote UE411 has is C-RNTI 3. The information related to the UE type may be a device information field used to determine that the non-far UE411 is a non-far UE type, e.g., the device information field may be a spare bit (set to one of 1 and 0 to indicate that the non-far UE411 is a non-far UE type) or an extended field (which does not include a layer two identity for the relay UE, thereby indicating that the non-far UE411 is a non-far UE type); the information related to the UE type may also be a field of device information not included in the RRC reestablishment request (e.g., an extension field is not included in the RRC reestablishment request and a spare bit of the RRC reestablishment request is not configured), which may be used to determine that the non-remote UE411 is a non-remote UE type.

The network device 402, upon receiving the RRC reestablishment request message, obtains the PCI3, the C-RNTI3 corresponding to the non-remote UE411, and the information related to the UE type (which determines that the non-remote UE411 is a non-remote UE type). The network device 402 then communicates with the network device 401 based on the PCI3, the C-RNTI3, and the information related to the UE type, e.g., the network device 402 establishes a connection with the network device 401 through the PCI3 and sends the C-RNTI3 and the information related to the UE type to the network device 401.

After receiving the C-RNTI3 and the information related to the UE type, the network device 401 can uniquely determine that the UE initiating the RRC reestablishment request is the non-remote UE 411; then, configuration information and/or capability information, etc. related to the non-remote UE411 are transmitted to the network device 402.

The network device 402 receives the configuration information and/or capability information, etc. related to the non-remote UE411, which are sent by the network device 401, and establishes an RRC connection with the non-remote UE411 through the Uu interface based on the information.

The non-remote UE411 sends information of RRC connection setup completion to the network device 402 through the Uu interface after completing the RRC connection; at this time, the non-remote UE411 is a non-remote UE of the network device 402.

In the second embodiment, the non-remote UE411 establishes an RRC connection with the network device 402 over the Uu interface, it being understood that the second embodiment may vary, wherein the UE411 may be connected to one of the non-remote UEs in the network device 402 over the PC5 interface, which acts as a relay UE to access the UE411 to the network device 402.

The embodiment of the present invention further provides a UE, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the steps of any one of the above-mentioned methods for reestablishing RRC connection by the UE when executing the computer instruction.

The embodiment of the present invention further provides a storage medium, where the storage medium stores computer instructions, and the computer instructions, when executed, execute the steps of any method for reestablishing RRC connection by UE.

As shown in fig. 5, an embodiment of the present invention further provides a user device 500, including: a first obtaining module 510 adapted to obtain a C-RNTI; a first determining module 520 adapted to determine that a link of the UE is in an RLF state; a sending module 530 adapted to send an RRC reestablishment request to the network device, including a device information field indicating whether the UE is a far-end UE or a non-far-end UE.

In a particular implementation, the first determining module 520 is adapted to determine that the PC5side link of the UE is in the RLF state; the sending module 530 is adapted to send an RRC reestablishment request to the network device, wherein the device information field indicates that the UE is a remote UE.

In a particular implementation, the first determining module 520 is adapted to determine that the Uu link of the UE is in an RLF state; the sending module 530 is adapted to send an RRC reestablishment request to the network device, wherein the device information field indicates that the UE is a non-remote UE.

In a specific implementation, the device information field includes a spare bit adapted to be set to one of 0 and 1 to indicate that the UE is a far end UE and to the other to indicate that the UE is a non-far end UE.

In a particular implementation, the device information field includes an extension field including a layer two identity for the relay UE indicating that the UE is a far end UE.

In the embodiments of the present invention, the modules of the user equipment and the correlation thereof may refer to the related description in the method for reestablishing RRC connection by UE described above with reference to fig. 1 to 4.

As shown in fig. 6, an embodiment of the present invention provides a method 600 for a network device to reestablish an RRC connection, where the method includes:

s610, distributing C-RNTI to the UE, wherein the UE comprises remote UE and non-remote UE, and the C-RNTI can be multiplexed by the remote UE and the non-remote UE;

s620, receiving an RRC reestablishment request sent by the UE;

s630, obtaining the equipment information field in the RRC reestablishment request;

s640, determining whether the UE is a far-end UE or a non-far-end UE based on the information of the device information field.

In the execution of step S610, the network device may allocate C-RNTI to the UE, for example, allocate C-RNTI to a non-remote UE (which may include a relay UE) through a uulink, and allocate C-RNTI to a remote UE through a uulink and a PC5 sidelink.

In the execution of step S620, after the link of the UE (e.g., PC5sidelink of the UE or Uu link of the UE) is in the RLF state, the UE may send a message of RRC reestablishment request to the network device, where the message includes a device information field indicating whether the UE is a remote UE or a non-remote UE; accordingly, the network device receives the RRC reestablishment request message.

In the execution of step S630, the network device may parse the received RRC reestablishment request message, and obtain the device information field therein.

In the execution of step S640, the network device may determine whether the UE is a far-end UE or a non-far-end UE based on the information of the device information field.

In particular implementations, the device information field may include spare bits; and if the network equipment detects that the spare bit is one of 0 and 1, the UE is determined to be a far-end UE, and the other one of 0 and 1 is determined to be a non-far-end UE.

In particular implementations, the device information field may include an extension field including a layer two identity for the relay UE indicating that the UE is a far-end UE; and if the network equipment detects that the equipment information field comprises the layer two identification, determining that the UE is the remote UE, and determining that the UE is the non-remote UE if the network equipment does not comprise the layer two identification.

In a specific implementation, the network device (i.e. the current network device receiving the RRC reestablishment request) may further perform the following steps: obtaining a PCI and a C-RNTI corresponding to the UE from the RRC reestablishment request; based on PCI, C-RNTI and user equipment information determined by the equipment information field, communicating with the original network equipment, wherein the original network equipment is the network equipment with which the UE establishes RRC connection for the last time before the occurrence of PC5side link RLF or Uu link RLF; acquiring configuration information and/or capability information of UE (user equipment) obtained by the original network equipment based on PCI (peripheral component interconnect), C-RNTI (radio network temporary identifier) and user equipment information; establishing an RRC connection with the UE based on the configuration information and/or the capability information.

In the embodiment of the present invention, reference may be made to the related description in the method for reestablishing RRC connection by a UE described in conjunction with fig. 1 to 4 for each step of the method for reestablishing RRC connection by a network device and the related relationship thereof.

The embodiment of the present invention further provides a network device, which includes a memory and a processor, where the memory stores computer instructions capable of running on the processor, and the processor executes the steps of any one of the above methods for reestablishing RRC connection by the network device when executing the computer instructions.

The embodiment of the present invention further provides a storage medium, where the storage medium stores computer instructions, and the computer instructions, when executed, execute the steps of any method for reestablishing RRC connection by a network device.

As shown in fig. 7, an embodiment of the present invention further provides a network apparatus 700, including:

an allocating module 710, adapted to allocate C-RNTI to the UE, the UE including a far-end UE and a non-far-end UE, the C-RNTI being reusable by the far-end UE and the non-far-end UE; a receiving module 720, adapted to receive an RRC reestablishment request sent by the UE; a second obtaining module 730, adapted to obtain a device information field in the RRC reestablishment request; a second determination module 740 adapted to determine whether the UE is a far-end UE or a non-far-end UE based on the information of the device information field.

In a specific implementation, the device information field includes a spare bit, and the network apparatus includes a third determining module adapted to determine that the UE is a far-end UE if the spare bit is one of 0 and 1 and that the UE is a non-far-end UE if the spare bit is the other one.

In a specific implementation, the device information field includes an extension field including a layer two identity for the relay UE, and the network apparatus includes a fourth determining module adapted to determine that the UE is a far-end UE if the device information field includes the layer two identity and a non-far-end UE if the device information field does not include the layer two identity.

In a specific implementation, the network device 700 further includes: a third obtaining module, adapted to obtain a PCI and a C-RNTI corresponding to the UE from the RRC reestablishment request; a first connection module adapted to communicate with an original network device based on the PCI, C-RNTI and user equipment information determined by the device information field, the original network device being the network device with which the UE most recently established an RRC connection before the occurrence of the PC5side link RLF or Uu link RLF; a fourth obtaining module, adapted to obtain configuration information and/or capability information of the UE from the original network device; a second connection module adapted to establish an RRC connection with the UE based on the configuration information and/or the capability information.

In the embodiment of the present invention, each module of the network device and the correlation thereof may refer to the related description in the method for reestablishing RRC connection by the network device.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for reestablishing RRC connection of user equipment, the user equipment comprising an edge link remote user equipment and a non-edge link remote user equipment, the method comprising:

s110, acquiring a C-RNTI;

s120, determining that the link of the user equipment is in an RLF state;

s130, sending an RRC reestablishment request to a network device, where the RRC reestablishment request includes a device information field indicating whether the user equipment is the edge-link remote user equipment or the non-edge-link remote user equipment.

2. The method of claim 1, comprising:

the S120 comprises determining that the PC5side link of the user equipment is in RLF state;

the S130 includes sending an RRC reestablishment request to the network device, where the device information field indicates that the user equipment is the sidelink remote user equipment.

3. The method of claim 1, comprising:

the S120 comprises determining that a Uu link of the user equipment is in an RLF state;

the S130 includes sending an RRC reestablishment request to the network device, where the device information field indicates that the user equipment is the non-sidelink remote user equipment.

4. The method of claim 1, wherein the device information field comprises a spare bit in the RRC reestablishment request set to one of 0 and 1 to indicate that the UE is a sidelink remote UE and set to another one to indicate that the UE is a non-sidelink remote UE.

5. The method of claim 1, wherein the device information field comprises an extension field including a layer two identifier for a sidelink relay user equipment indicating that the user equipment is a sidelink remote user equipment.

6. A user device comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 1 to 5.

7. A storage medium having stored thereon computer instructions, wherein the computer instructions when executed perform the steps of the method of any one of claims 1 to 5.

8. A user device, comprising:

a first obtaining module adapted to obtain a C-RNTI;

a first determining module adapted to determine that a link of the user equipment is in an RLF state;

a sending module adapted to send an RRC reestablishment request to a network device, wherein the RRC reestablishment request includes a device information field indicating whether the user equipment is an edge link remote user equipment or a non-edge link remote user equipment.

9. The user device according to claim 8, comprising:

the first determining module is adapted to determine that the PC5side link of the user equipment is in RLF state;

the sending module is adapted to send an RRC reestablishment request to the network device, where the device information field indicates that the user equipment is the sidelink remote user equipment.

10. The user device according to claim 8, comprising:

the first determining module is adapted to determine that a Uu link of the user equipment is in an RLF state;

the sending module is adapted to send an RRC reestablishment request to the network device, where the device information field indicates that the user equipment is the non-sidelink remote user equipment.

11. The UE of claim 8, wherein the equipment information field comprises a spare bit in the RRC reestablishment request, which is adapted to be set to one of 0 and 1 to indicate that the UE is a sidelink remote UE and to be set to another UE to indicate that the UE is a non-sidelink remote UE.

12. The UE of claim 8, wherein the equipment information field comprises an extension field including a layer two identifier for a sidelink trunking UE, indicating that the UE is a sidelink remote UE.

13. A method for a network device to reestablish RRC connection, comprising:

allocating C-RNTI to user equipment, wherein the user equipment comprises side link far-end user equipment and non-side link far-end user equipment, and the C-RNTI can be multiplexed by the side link far-end user equipment and the non-side link far-end user equipment;

receiving an RRC reestablishment request sent by the user equipment;

acquiring a device information field in the RRC reestablishment request;

determining whether the user equipment is the edge link remote user equipment or the non-edge link remote user equipment based on the information of the equipment information field.

14. The method of claim 13, wherein the device information field comprises spare bits, and wherein the method comprises: and if the spare bit is one of 0 and 1, determining that the user equipment is the far-end user equipment of the side link, and if the spare bit is the other one of 0 and 1, determining that the user equipment is the far-end user equipment of the non-side link.

15. The method of claim 13, wherein the device information field comprises an extension field including a layer two identifier for a sidelink relay user equipment, and wherein the method comprises: and if the equipment information field comprises the layer two identification, determining that the user equipment is the remote user equipment of the side link, and if the equipment information field does not comprise the layer two identification, determining that the user equipment is the remote user equipment of the non-side link.

16. The method of claim 13, comprising:

obtaining the PCI and C-RNTI corresponding to the user equipment from the RRC reestablishment request;

communicating with an original network device based on the PCI, the C-RNTI and user equipment information determined by the device information field, the original network device being a network device with which the user equipment has established an RRC connection the last time before the occurrence of the PC5side link RLF or the Uu link RLF;

acquiring configuration information and/or capability information of the user equipment, which is obtained by the original network equipment based on the PCI, the C-RNTI and the user equipment information;

establishing an RRC connection with the user equipment based on the configuration information and/or the capability information.

17. A network device comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 13 to 16.

18. A storage medium having stored thereon computer instructions, wherein the computer instructions when executed perform the steps of the method of any one of claims 13 to 16.

19. A network apparatus, comprising:

an allocation module adapted to allocate a C-RNTI to user equipment, the user equipment comprising edge link remote user equipment and non-edge link remote user equipment, the C-RNTI being reusable by the edge link remote user equipment and the non-edge link remote user equipment;

a receiving module, adapted to receive an RRC reestablishment request sent by a user equipment;

a second obtaining module, adapted to obtain a device information field in the RRC reestablishment request;

a second determination module adapted to determine whether the user equipment is an edge link remote user equipment or a non-edge link remote user equipment based on information of the device information field.

20. The network apparatus of claim 19, wherein the device information field comprises a spare bit, and wherein the network apparatus comprises a third determining module adapted to determine that the user equipment is a sidelink remote user equipment if the spare bit is one of 0 and 1, and to determine that the user equipment is a non-sidelink remote user equipment if the spare bit is the other of 0 and 1.

21. The network apparatus of claim 19, wherein the device information field comprises an extension field including a layer two identifier for a sidelink relay user equipment, and wherein the network apparatus comprises a fourth determining module adapted to determine that the user equipment is a sidelink remote user equipment if the device information field comprises the layer two identifier and that the user equipment is a non-sidelink remote user equipment if the layer two identifier is not included.

22. The network device of claim 19, comprising:

a third obtaining module, adapted to obtain the PCI and C-RNTI corresponding to the user equipment from the RRC reestablishment request;

a first connection module adapted to communicate with an original network device based on the PCI, the C-RNTI and user equipment information determined by the device information field, the original network device being a network device with which the user equipment most recently established an RRC connection before the occurrence of the PC5side link RLF or Uu link RLF;

a fourth obtaining module, adapted to obtain configuration information and/or capability information of the user equipment from the original network equipment;

a second connection module adapted to establish an RRC connection with the user equipment based on the configuration information and/or the capability information.