CN117641513A

CN117641513A - Communication method, device and readable storage medium

Info

Publication number: CN117641513A
Application number: CN202210971810.6A
Authority: CN
Inventors: 程思涵; 张奕忠; 康艳超
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2024-03-01
Also published as: WO2024032537A1

Abstract

The application discloses a communication method, a device and a readable storage medium, which belong to the technical field of communication, and the method comprises the following steps: the terminal receives a first message from the access network device, the first message containing information of one or more first PLMNs providing disaster roaming services; and under the condition that the terminal determines that the PLMN providing the service for the terminal generates DC according to the first message, the terminal sends a second message to the access network equipment, wherein the second message is used for requesting one or more target PLMNs in the first PLMNs to provide the service for the terminal.

Description

Communication method, device and readable storage medium

Technical Field

The application belongs to the technical field of communication, and particularly relates to a communication method, a device and a readable storage medium.

Background

Multi-Operator Core Network (MOCN) refers to a set of wireless networks common to multiple operators, i.e., the same set of base stations may be simultaneously connected to Core Networks (CNs) of multiple operators. Each operator shares radio network resources (cell carrier frequency) without sharing CN nodes, which belong to different operators.

The radio access network (Radio Access Network, RAN) node broadcasts information of the supported public land mobile network (Public Land Mobile Network, PLMN), e.g. PLMN ID, by means of a system broadcast message. When a terminal (UE) initiates RRC connection establishment to a RAN, information about which operator is accessed to the RAN is provided to the RAN, for example, carrying a PLMN ID of a target operator; the RAN routes the UE's request to the corresponding operator's core network based on this information.

In the MOCN scenario, when the core network of the operator serving the UE fails, i.e. a disaster situation (Disaster Condition, DC) occurs, the UE will not be able to continue normal communication traffic.

Disclosure of Invention

The embodiment of the application provides a communication method, equipment and a readable storage medium, which can solve the problem that under the MOCN scene, when a core network of an operator providing service for UE fails, the UE cannot continue normal communication service.

In a first aspect, a communication method is provided, including:

the terminal receives a first message from the access network device, the first message containing information of one or more first PLMNs providing disaster roaming services;

and under the condition that the terminal determines that the PLMN providing the service for the terminal generates DC according to the first message, the terminal sends a second message to the access network equipment, wherein the second message is used for requesting one or more target PLMNs in the first PLMNs to provide the service for the terminal.

In a second aspect, a communication method is provided, including:

the access network equipment sends a first message, wherein the first message comprises information of one or more first PLMNs for providing disaster roaming service;

the access network device receives a second message sent by the terminal, where the second message is used to request a target PLMN to provide services for the terminal, and the target PLMN is one of one or more first PLMNs.

In a third aspect, a communication method is provided, including:

the core network equipment receives a third message from the access network equipment, wherein the third message is used for determining to send a first NAS message to the access network equipment, and the first NAS message contains information of one or more first PLMNs for providing disaster roaming service;

the core network device is a network device of a target PLMN in one or more first PLMNs.

In a fourth aspect, there is provided a communication apparatus comprising:

a first receiving module, configured to receive a first message from an access network device, where the first message includes information of one or more first PLMNs that provide disaster roaming services;

and the first sending module is used for sending a second message to the access network equipment, wherein the second message is used for requesting one or more target PLMNs in the first PLMNs to provide services for the communication device when the PLMNs providing services for the communication device are determined to generate DC according to the first message.

In a fifth aspect, there is provided a communication apparatus comprising:

a second transmitting module, configured to transmit a first message, where the first message includes information of one or more first PLMNs that provide disaster roaming services;

and the second receiving module is used for receiving a second message sent by the terminal, wherein the second message is used for requesting a target PLMN to provide services for the terminal, and the target PLMN is one of one or more first PLMNs.

In a sixth aspect, there is provided a communication apparatus comprising:

a third receiving module, configured to receive a third message from an access network device, where the third message is configured to determine to send a first NAS message to the access network device, where the first NAS message includes information of one or more first PLMNs that provide a disaster roaming service;

wherein the communication device is a network equipment of a target PLMN of the one or more first PLMNs.

In a seventh aspect, there is provided a terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the first aspect.

In an eighth aspect, a terminal is provided, including a processor and a communication interface, where the communication interface is configured to receive, by the terminal from an access network device, a first message, where the first message includes information of one or more first PLMNs that provide disaster roaming services;

In a ninth aspect, there is provided a network device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method according to the second or third aspects.

In a tenth aspect, a network device is provided, comprising a processor and a communication interface,

when the network device is the access network device, the communication interface is used for sending a first message by the access network device, wherein the first message contains information of one or more first PLMNs for providing disaster roaming service;

When the network device is the access network device, the core network device receives a third message from the access network device, where the third message is used for the core network device to determine to send a first NAS message to the access network device, where the first NAS message includes information of one or more first PLMNs that provide a disaster roaming service;

In an eleventh aspect, there is provided a communication system comprising: a terminal operable to perform the steps of the communication method as described in the first aspect, an access network device operable to perform the steps of the communication method as described in the second aspect, and a core network device operable to perform the steps of the communication method as described in the third aspect.

In a twelfth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor, performs the steps of the method as described in the first aspect, or performs the steps of the method as described in the second aspect, or performs the steps of the method as described in the third aspect.

In a thirteenth aspect, there is provided a chip comprising a processor and a communication interface, the communication interface and the processor being coupled, the processor being adapted to run a program or instructions, to carry out the steps of the method according to the first aspect, or to carry out the steps of the method according to the second aspect, or to carry out the steps of the method according to the third aspect.

In a fourteenth aspect, there is provided a computer program/program product stored in a storage medium, the computer program/program product being executable by at least one processor to perform the steps of the method as described in the first aspect, or to perform the steps of the method as described in the second aspect, or to perform the steps of the method as described in the third aspect.

In the embodiment of the application, the access network device sends a first message to the terminal, wherein the first message contains information of one or more first PLMNs for providing the disaster roaming service, the terminal determines that the PLMN for providing the disaster roaming service for the terminal generates DC based on the first message, and then the terminal sends a second message to the access network device, and requests a target PLMN in the one or more first PLMNs for providing the disaster roaming service to provide the service for the terminal through the second message, so that when the PLMN for providing the service for the UE fails in a MOCN scene, the PLMN for providing the service for the terminal can be replaced, and the UE can continue to perform normal communication service.

Drawings

Fig. 1 is a block diagram of a wireless communication system to which embodiments of the present application are applicable;

FIG. 2 is a schematic flow chart of a communication method according to an embodiment of the present application;

FIG. 3 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 5a is a schematic view of an application scenario provided in an embodiment of the present application;

FIG. 5b is one of the flow diagrams of an application embodiment provided by an embodiment of the present application;

FIG. 5c is a second flow chart of an embodiment of the application provided in the present application;

FIG. 5d is a third flow chart of an embodiment of the application provided in the present application;

fig. 6 is one of schematic structural diagrams of a communication device according to an embodiment of the present application;

FIG. 7 is a second schematic diagram of a communication device according to an embodiment of the present disclosure;

fig. 8 is a third schematic structural diagram of the communication device according to the embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

fig. 10 is a schematic structural diagram of a terminal provided in an embodiment of the present application;

fig. 11 is one of schematic structural diagrams of a network device provided in an embodiment of the present application;

Fig. 12 is a second schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally intended to be used in a generic sense and not to limit the number of objects, for example, the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It is noted that the techniques described in embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single carrier frequency division multiple access (Single-carrier Frequency Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the present application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New air interface (NR) system for purposes of example, and NR terminology is used in much of the description below, but theseThe technique can also be applied to applications other than NR system applications, such as generation 6 (6 ^th Generation, 6G) communication system.

Fig. 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. In addition to the above terminal device, a Chip in the terminal, such as a Modem (Modem) Chip, a System on Chip (SoC), may be used. Note that, the specific type of the terminal 11 is not limited in the embodiment of the present application. The network device 12 may comprise an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, a WLAN access point, a WiFi node, or the like, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmission and reception point (Transmitting Receiving Point, TRP), or some other suitable terminology in the art, and the base station is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiments of the present application, only a base station in an NR system is described as an example, and the specific type of the base station is not limited.

Since the embodiments of the present application are directed to MOCN scenarios, there are multiple core networks of operators in the network, and multiple core network devices may be set in each core network of each operator according to requirements, it should be noted that, in fig. 1, only one core network device graph is drawn to correspond to one core network of an operator for simplicity and clarity, that is, fig. 1 may be understood to be a wireless communication system including two core networks of operators. The embodiments of the present application are equally applicable to scenarios involving a greater number of operators' core networks.

The core network device may include, but is not limited to, at least one of: core network nodes, core network functions, mobility management entities (Mobility Management Entity, MME), access mobility management functions (Access and Mobility Management Function, AMF), session management functions (Session Management Function, SMF), user plane functions (User Plane Function, UPF), policy control functions (Policy Control Function, PCF), policy and charging rules function units (Policy and Charging Rules Function, PCRF), edge application service discovery functions (Edge Application Server Discovery Function, EASDF), unified data management (Unified Data Management, UDM), unified data repository (Unified Data Repository, UDR), home subscriber server (Home Subscriber Server, HSS), centralized network configuration (Centralized network configuration, CNC), network storage functions (Network Repository Function, NRF), network opening functions (Network Exposure Function, NEF), local NEF (or L-NEF), binding support functions (Binding Support Function, BSF), application functions (Application Function, AF), and the like. In the embodiment of the present application, only the core network device in the NR system is described as an example, and the specific type of the core network device is not limited.

The communication method provided by the embodiment of the application is described in detail below through some embodiments and application scenarios thereof with reference to the accompanying drawings.

Referring to fig. 2, an embodiment of the present application provides a communication method, where an execution body of the method is a terminal, and the method includes:

step 201: the terminal receives a first message from the access network device, the first message containing information of one or more first PLMNs providing disaster roaming services;

the DC is also understood herein as Core Network (Core Network) DC, i.e. user traffic is not available due to Core Network failure or damage.

Step 202: and under the condition that the terminal determines that the PLMN providing the service for the terminal generates DC according to the first messages, the terminal sends a second message to the access network equipment, wherein the second message is used for requesting a target PLMN in one or more first PLMNs to provide the service for the terminal. For example, it is known that there are 4 operators corresponding to PLMN1, PLMN2, PLMN3, PLMN4, respectively, and if PLMN1, PLMN3 is DC and PLMN2, PLMN4 is capable of providing disaster roaming services, the one or more second PLMNs comprise PLMN1, PLMN3 and the one or more first PLMNs comprise PLMN2, PLMN4.

The PLMN serving the terminal can also be understood as: the terminal is currently in a registered state within the PLMN.

In the embodiment of the application, the access network device sends a first message to the terminal, wherein the first message contains information of one or more first PLMNs for providing the disaster roaming service, the terminal determines that the PLMN for providing the disaster roaming service for the terminal generates DC based on the first message, and then the terminal sends a second message to the access network device, and requests a target PLMN in the one or more first PLMNs for providing the disaster roaming service to provide the service for the terminal through the second message, so that when the PLMN for providing the service for the UE generates DC, the PLMN for providing the service for the terminal can be replaced, and the UE can continue to perform normal communication service.

The access network device may be a base station to which the terminal accesses.

It should be noted that different PLMNs correspond to different operators, and by informing the terminal which PLMNs generate DC and which PLMNs provide the disaster roaming service, it is convenient to replace PLMNs that provide services for the terminal later, i.e. replace other operators.

It will be appreciated that the target PLMN is a PLMN selected from one or more first PLMNs, and although there may be a plurality of PLMNs capable of providing disaster roaming services, there may only be one PLMN ultimately serving the terminal, and thus the selection of a specific target PLMN from one or more first PLMNs may be performed by the terminal or may also be performed by the access network device.

In one possible implementation, the first message also contains information of one or more second PLMNs where DC is occurring.

I.e. the access network device may provide the terminal with information of the second PLMN where DC has occurred, such that the terminal determines whether DC has occurred for the PLMN of the service provided for itself based on the information of the second PLMN.

In one possible implementation, the determining, by the terminal, that DC occurs for a PLMN that provides services for the terminal includes:

and the terminal determines that the PLMN providing the service for the terminal generates DC according to the information of the first PLMN.

The access network equipment only sends the information of one or more first PLMNs providing the disaster roaming service to the terminal, and when the terminal receives the information of the first PLMNs, the terminal can know that the PLMNs providing the disaster roaming service for the terminal generate DC, namely, the terminal is informed of the fact that the PLMNs providing the disaster roaming service for the terminal generate DC and the information of the PLMNs capable of providing the disaster roaming service are completed by sending the information of the one or more first PLMNs providing the disaster roaming service.

In a possible implementation manner, the first message further includes first indication information, where the first indication information is used to indicate that DC occurs in a PLMN that provides services for the terminal.

I.e. the access network device directly informs the terminal that DC occurred in the PLMN serving itself by indicating the first indication information.

It should be further noted that, the information of the second PLMN generating DC and the information of the first PLMN providing the disaster roaming service may be specifically determined by the access network device, for example, the access network device may obtain the information of the second PLMN and the information of the first PLMN according to the indication of the core network side, or obtain the information of the second PLMN and the information of the first PLMN through some other manner, and the manner in which the access network device obtains the information of the second PLMN and the information of the first PLMN in the embodiment of the present application is not specifically limited.

In one possible embodiment, the information of the second PLMN includes an identification of the second PLMN, and the information of the first PLMN includes an identification of the first PLMN.

In this embodiment of the present application, the identifier of the PLMN may specifically be a PLMN ID, and the access network device makes the terminal obtain, through the PLMN ID, the PLMN that is currently generating DC, and the PLMN that provides the disaster roaming service.

In one possible implementation, the first message is a system broadcast message.

In the embodiment of the present application, if the terminal is in an idle state, no radio resource control (Radio Resource Control, RRC) connection is established between the terminal and the access network device, so that the access network device provides the terminal with information of the PLMN where DC occurs and information of the PLMN providing the disaster roaming service by sending a system broadcast message. That is, by enhancing the system broadcast message, information of the PLMN where DC occurs and information of the PLMN providing the disaster roaming service are carried in the system broadcast message.

It should be noted that the system broadcast message is composed of a plurality of system information blocks (System Information Block, SIBs), and the information of the PLMN where DC occurs and the information of the PLMN providing the disaster roaming service may be carried in the same or different SIBs of the system broadcast message.

In one possible implementation, before the terminal receives the first message from the access network device, the method further comprises:

the terminal receives a paging message from the access network device.

In the embodiment of the application, the paging message is used for indicating the terminal to receive the system broadcast message. It can be understood that, since the access network device needs to tell the terminal that the information of the PLMN where the DC occurs and the information of the PLMN providing the disaster roaming service are equivalent to the change of the system broadcast message, the access network device sends the paging message, and instructs the terminal to receive the system broadcast message through the paging message, thereby obtaining the information of the PLMN where the DC occurs and the information of the PLMN providing the disaster roaming service.

The terminal receiving the system broadcast message may be understood as the terminal receiving and reading the system broadcast message.

In one possible implementation, the terminal sends a second message to the access network device, including:

The terminal sends a registration request message to the access network device.

In the embodiment of the application, the terminal sends a registration request message to the access network device, where the registration request message is used to request the target PLMN in the one or more first PLMNs to register. So that the terminal can continue to obtain service in the target PLMN.

In one possible implementation, the first message is an RRC message.

In the embodiment of the present application, if the terminal is in a connected state, and there is an RRC connection between the terminal and the access network device, the access network device may provide, to the terminal, information of a PLMN where DC occurs and information of a PLMN providing a disaster roaming service through an RRC message. That is, by enhancing the RRC message, information of the PLMN where DC occurs and information of the PLMN providing the disaster roaming service are carried in the RRC message. The terminal can directly send the registration message to the target PLMN by utilizing the existing RRC connection, so that the process that the terminal searches the network again and reestablishes the RRC connection with the access network equipment is avoided, the time of user service interruption is shortened, and the user experience is improved.

In one possible implementation, the terminal receives a first message from an access network device, including:

the terminal receives a first message from access network equipment under the condition that the terminal is in a connection state;

Correspondingly, the terminal sends a second message to the access network device, including:

the terminal sends a second message to the access network device through the RRC connection with the access network device.

In the embodiment of the present application, since the terminal is in a connected state, and there is an RRC connection between the terminal and the access network device, it is possible to directly use the existing RRC connection by sending the second message to the access network device by the terminal.

In one possible embodiment, the method further comprises:

(1) The terminal establishes RRC connection with the access network equipment;

(2) The terminal transmits a Non-access stratum (NAS) message to a PLMN serving the terminal through an RRC connection.

In the embodiment of the present application, if the terminal is in an idle state, the terminal may first establish an RRC connection with the access network device, and then send a NAS message to a PLMN that provides services for the terminal through the established RRC connection. It should be noted that, the PLMN for serving the terminal refers to a PLMN that the terminal has previously registered for use, and although the PLMN may generate DC at this time, the terminal may still send a NAS message to the PLMN for serving the terminal, and specifically, the NAS message carries information of the PLMN for serving the terminal, such as a PLMN ID, because the terminal does not know that DC has generated in the PLMN. The NAS message may be a Service request (Service request) message, or a registration (registration) message.

In one possible implementation, the RRC message includes one or more of the following:

(1) An RRC connection reconfiguration message;

(2) And transmitting the message by the downlink information.

The RRC message may be enhanced, and information of the PLMN where the DC occurs and information of the PLMN providing the disaster roaming service may be carried in the RRC message.

In one possible implementation, the determining, by the terminal, that DC occurs for a PLMN that provides services to the terminal according to the first message includes:

and the terminal determines that the PLMN for providing the service for the terminal generates DC according to the identification of the PLMN for providing the service for the terminal and the identification of the second PLMN.

In the embodiment of the application, the terminal can know whether the PLMN serving the terminal generates DC or not by comparing the identity of the PLMN serving the terminal and the identity of the second PLMN obtained through the first message. For example: there are 4 operators known to correspond to PLMN1, PLMN2, PLMN3 and PLMN4 respectively, wherein PLMN1 and PLMN3 generate DC, and the PLMN providing service for the terminal is PLMN1, and for the terminal, the identifier of the PLMN providing service for the terminal is PLMN1, the identifier of the second PLMN obtained through the first message is PLMN1 and PLMN3, and comparing the two identifiers to obtain that PLMN1 providing service for the terminal generates DC.

It will be appreciated that if the PLMN serving the terminal is found to have no DC after comparing the identity of the PLMN serving the terminal with the identity of the second PLMN known by the first message, this is normal, and normal communication of the terminal is not affected, and no further processing is required.

In a possible implementation manner, the first message further includes third information, where the third information is used to indicate an identifier of a PLMN supported by the access network device;

the method further comprises the steps of:

and the terminal determines the target PLMN according to the identification of the PLMN supported by the access network equipment and the identification of the first PLMN.

In the embodiment of the present application, the identifier of the PLMN supported by the access network device is used to indicate PLMNs capable of connecting and communicating with the access network device, and it should be noted that, in all the first PLMNs providing the disaster roaming service, not all the PLMNs may be PLMNs supported by the access network device, so that the identifier of the PLMN supported by the access network device needs to be compared with the identifier of the first PLMN to determine the target PLMN. For example: PLMNs providing disaster roaming services include PLMN2 and PLMN4, but the PLMNs supported by the access network device are PLMN2, and then the terminal needs to be served by PLMN2 finally, i.e. the target PLMN is PLMN2.

It should be noted that if a plurality of PLMNs can still be determined based on the identifier of the PLMN supported by the access network device and the identifier of the first PLMN, a final target PLMN may be selected at this time, for example: the priority may be set in advance for each PLMN, and the PLMN with the highest priority may be selected as the target PLMN, or a default PLMN may be configured by the network side, and the default PLMN may be selected as the target PLMN, or a PLMN may be randomly selected as the target PLMN.

In one possible implementation, the first message is a first NAS message, which is sent by the core network device of the target PLMN and forwarded by the access network device to the terminal.

In the embodiment of the present application, the message for notifying the terminal of the information of the second PLMN where the DC occurs and the information of the first PLMN providing the disaster roaming service are NAS messages sent by the core network device, and by enhancing the NAS messages, the NAS messages carry the information of the PLMN where the DC occurs and the information of the PLMN providing the disaster roaming service.

It should be noted that, in this embodiment, the target PLMN of the one or more first PLMNs is determined by the access network device selection.

the terminal sends a second NAS message to the PLMN serving the terminal through the access network device.

In this embodiment of the present application, the PLMN for serving the terminal refers to a PLMN that the terminal has previously registered for use, and although the PLMN may have DC, it is not known that DC has occurred in the PLMN, and therefore the terminal still sends a NAS message to the PLMN for serving the terminal, specifically, the NAS message carries information of the PLMN for serving the terminal, for example, a PLMN ID.

It will be appreciated that although the terminal is unaware that DC has occurred in the PLMN serving the terminal, the access network device is aware, and therefore, a second NAS message sent by the terminal to the core network device corresponding to the PLMN serving the terminal, is forwarded by the access network device to the target PLMN providing the disaster roaming service, where the second NAS message is used to request that a NAS connection be established with the PLMN serving the terminal. The second NAS message may be a Service request message, or a registration message.

In one possible implementation, the first NAS message includes one or more of the following:

(1) Downlink NAS transmission information;

(2) Configuring an update command;

(3) A notification message.

The NAS message may be enhanced, and the NAS message carries information of a PLMN where DC occurs and information of a PLMN providing a disaster roaming service.

Referring to fig. 3, an embodiment of the present application provides a communication method, where an execution body of the method is an access network device, for example, the access network device may be a base station accessed by a terminal, and the method includes:

step 301: the access network device sends a first message containing information of one or more first PLMNs providing disaster roaming service; for example, it is known that there are 4 operators corresponding to PLMN1, PLMN2, PLMN3, PLMN4, respectively, and if PLMN1, PLMN3 is DC and PLMN2, PLMN4 is capable of providing disaster roaming services, the one or more second PLMNs comprise PLMN1, PLMN3 and the one or more first PLMNs comprise PLMN2, PLMN4.

Step 302: the access network device receives a second message sent by the terminal, where the second message is used to request a target PLMN to provide services for the terminal, and the target PLMN is one of the one or more first PLMNs.

In the embodiment of the application, the access network device sends a first message to the terminal, wherein the first message contains information of one or more second PLMNs generating DC and information of one or more first PLMNs providing disaster roaming service, the terminal determines that the PLMNs providing service for the terminal itself generate DC based on the first message, and then the terminal sends a second message to the access network device, and requests a target PLMN in the one or more first PLMNs providing disaster roaming service to provide service for the terminal through the second message, so that when the PLMNs providing service for the UE generate DC in a MOCN scene, the PLMNs providing service for the terminal can be replaced, and the UE can continue normal communication service.

In one possible implementation, the access network device only sends the information of the one or more first PLMNs providing the disaster roaming service to the terminal, and when the terminal receives the information of the first PLMNs, it can learn that the PLMN providing the disaster roaming service for itself is DC, that is, by sending the information of the one or more first PLMNs providing the disaster roaming service, the method of informing the terminal that the PLMN providing the disaster roaming service for itself is DC, and the information of the PLMN capable of providing the disaster roaming service are completed.

I.e. the access network device directly informs the terminal that DC occurred in the PLMN serving itself by indicating the first indication information. It should be further noted that, the information of the second PLMN generating DC and the information of the first PLMN providing the disaster roaming service may be specifically determined by the access network device, for example, the access network device may obtain the information of the second PLMN and the information of the first PLMN according to the indication of the core network side, or obtain the information of the second PLMN and the information of the first PLMN through some other manner, and the manner in which the access network device obtains the information of the second PLMN and the information of the first PLMN in the embodiment of the present application is not specifically limited.

In the embodiment of the present application, if the terminal is in an idle state, no RRC connection is established between the terminal and the access network device, so that the access network device provides the terminal with information of a PLMN where DC occurs and information of a PLMN providing a disaster roaming service by sending a system broadcast message. That is, by enhancing the system broadcast message, information of the PLMN where DC occurs and information of the PLMN providing the disaster roaming service are carried in the system broadcast message.

In one possible implementation, before the access network device sends the first message, the method further includes:

the access network device sends a paging message, and the paging message is used for indicating the terminal to receive the system broadcast message.

In one possible implementation manner, the access network device receives a second message sent by the terminal, including:

the access network equipment receives the registration request message sent by the terminal.

In one possible implementation, the first message is an RRC message.

In one possible implementation, the access network device sends a first message comprising:

the method comprises the steps that under the condition that a terminal is in a connection state, access network equipment sends a first message to the terminal;

correspondingly, the access network equipment receives a second message sent by the terminal, and the second message comprises:

the access network device receives a second message sent by the terminal through the RRC connection with the terminal.

(1) An RRC connection reconfiguration message;

(2) And transmitting the message by the downlink information.

In a possible implementation manner, the first message further includes third information, where the third information is used to indicate an identifier of a PLMN supported by the access network device.

In one possible implementation, the first message is a first NAS message;

the access network device sends a first message comprising:

The access network equipment receives a first NAS message from core network equipment of a target PLMN;

the access network device sends a first NAS message to the terminal.

(1) The access network equipment receives a second NAS message sent by the terminal, wherein the second NAS message is a NAS message sent to core network equipment corresponding to a PLMN (public land mobile network) for providing service for the terminal, and the second NAS message is used for requesting to establish NAS connection with the PLMN for providing service for the terminal;

(2) The access network device sends a second NAS message to the core network device.

It will be appreciated that although the terminal is unaware that DC has occurred in the PLMN serving the terminal, the access network device is aware, and therefore, a second NAS message sent by the terminal to the core network device corresponding to the PLMN serving the terminal may be forwarded by the access network device to the core network device corresponding to the target PLMN serving the disaster roaming service, where the second NAS message is used to request that a NAS connection be established with the PLMN serving the terminal. The second NAS message may be a Service request message, or a registration message. Even if the PLMN for providing the service for the terminal generates DC, the NAS sent by the terminal can be forwarded to the target PLMN for providing the disaster roaming service through the access network equipment, so that the target PLMN provides the service for the terminal, the terminal can be ensured to continue to communicate, and the user experience is improved.

and under the condition that the terminal is in a connection state, the access network equipment sends a third NAS message to the core network equipment, wherein the third NAS is used for informing the core network equipment that the terminal is in the connection state in the PLMN for providing services for the terminal.

In the embodiment of the present application, if the terminal is in a connected state, the access network device may directly send a notification message to the core network device, for notifying that the UE is in a connected state in the PLMN that provides services for the terminal.

In one possible embodiment, the method further comprises:

the access network equipment determines a target PLMN according to the identification of the PLMN supported by the access network equipment and the identification of the first PLMN.

(1) Downlink NAS transmission information;

(2) Configuring an update command;

(3) A notification message.

Referring to fig. 4, an embodiment of the present application provides a communication method, where an execution body of the method is a core network device, and the core network device is a core network device of a target PLMN for providing a disaster roaming service, for example, the core network device may be an AMF device, including:

step 401: the core network device receives a third message from the access network device, wherein the third message is used for determining that the core network device sends a first NAS message to the access network device, and the first NAS message contains information of one or more first PLMNs for providing disaster roaming services;

in the embodiment of the application, the access network device sends a first message to the terminal, wherein the first message contains information of one or more second PLMNs with DC and information of one or more first PLMNs with disaster roaming service, the terminal determines that the PLMN with the disaster roaming service is DC based on the first message, and then the terminal sends a second message to the access network device, and requests a target PLMN in the one or more first PLMNs with the disaster roaming service to provide service for the terminal through the second message, so that in a MOCN scene, when the PLMN with the disaster roaming service for the UE fails, the PLMN with the disaster roaming service can be replaced for the terminal, and the UE can continue normal communication service.

I.e. the core network device may provide the terminal with information of the second PLMN where DC has occurred, such that the terminal determines whether DC has occurred for the PLMN of the service provided for itself based on the information of the second PLMN.

In one possible implementation manner, the core network device only sends the information of the one or more first PLMNs providing the disaster roaming service to the terminal, and when the terminal receives the information of the first PLMNs, the terminal can know that the PLMN providing the disaster roaming service for itself is DC, that is, by sending the information of the one or more first PLMNs providing the disaster roaming service, the method of notifying the terminal that the PLMN providing the disaster roaming service for itself is DC, and the information of the PLMN capable of providing the disaster roaming service are completed.

I.e. the core network device directly informs the terminal that the PLMN providing service for itself is DC-generating by indicating the first indication information. It should be further noted that, the information of the second PLMN generating DC and the information of the first PLMN providing the disaster roaming service may be specifically determined by the access network device, for example, the access network device may obtain the information of the second PLMN and the information of the first PLMN according to the indication of the core network side, or obtain the information of the second PLMN and the information of the first PLMN through some other manner, and the manner in which the access network device obtains the information of the second PLMN and the information of the first PLMN in the embodiment of the present application is not specifically limited.

In one possible implementation, the third message includes:

and the terminal sends a second NAS message to core network equipment corresponding to the PLMN for providing service for the terminal, wherein the second NAS message is used for requesting to establish NAS connection with the PLMN for providing service for the terminal.

In one possible implementation, the third message includes:

and the access network equipment sends a third NAS message to the core network equipment, wherein the third NAS is used for informing the core network equipment that the terminal is in a connection state in a PLMN for providing services for the terminal.

In one possible implementation, the third message is a message sent by the access network device to the second network, the third message including at least one of:

(1) Information of one or more second PLMNs of the disaster situation DC;

(2) Providing information of one or more first PLMNs of the disaster roaming service;

(3) Providing second indication information of the first NAS message; the second indication information of the first NAS message is provided for the access network device to inform the second network to generate a NAS message sent to the terminal. Thus, after receiving the NAS message, the access network device may send the NAS message to the terminal directly through the RRC connection with the terminal.

(4) Information of the terminal, the terminal is a terminal which establishes RRC connection with the access network equipment and generates DC for PLMN providing service for the terminal. The information of the terminal is used for the access network device to inform the core network device of the information of the terminal which needs to provide the disaster roaming service, so that the core network device can generate NAS information aiming at the terminal and send the NAS information to the terminal.

In this embodiment of the present application, the PLMN identifier may specifically be a PLMN ID, through which the terminal is enabled to learn about PLMNs that are currently DC, and PLMNs that provide disaster roaming services.

(1) Downlink NAS transmission information;

(2) Configuring an update command;

(3) A notification message.

The technical scheme of the present application is described below with reference to specific application examples:

it should be noted that, for clarity and simplicity of description, the scenario for the following embodiment is shown in fig. 5a, where Op1 and Op2 are operators supported by RAN, where UE is in a registration state in Op1 network, and in a MOCN scenario, op 1's core network fails, i.e. DC occurs, and Op2 can provide disaster roaming service.

Embodiment one: base station informs UE through system broadcast

Precondition for this embodiment: the UE is in a registration state in the Op1 network, and the current UE is in an idle state in the Op1 network, namely no RRC connection exists between the current UE and the base station;

Referring to fig. 5b, the flow is as follows:

the RAN receives an indication of the core network, such as an operation and maintenance (Operations and Maintenance, OAM) or AMF indication, and starts sending a system broadcast message, which includes:

(1) The ID of the PLMN of the core network Disster, i.e. the PLMN ID of Op1

(2) The PLMN ID of the PLMN providing the disaster roaming service of the core network, i.e. the PLMN ID of Op2

After receiving the system broadcast message, the UE determines that a core network server appears in the PLMN currently providing service for the UE through the system broadcast message, and determines that other PLMNs corresponding to the base station can provide the core network Disaster roaming service, and then the UE initiates a registration request to the PLMN.

The UE determines that the PLMN currently serving the UE has a core network server according to the ID of the PLMN currently registered and the ID of the PLMN currently having the core network server broadcasted by the base station. For example, the UE is currently registered in Op1, and the UE receives a system broadcast message from the base station that Op1 is in the core network disaster, and the UE determines by comparing 2 PLMN IDs.

The UE determines that other PLMNs corresponding to the base station can provide the disaster roaming service of the core network according to the PLMN ID supported by the base station broadcast by the base station where the base station resides and the ID of the PLMN providing the disaster roaming service of the core network. For example, the base station broadcast supports Op1 and Op2, and the base station broadcast Op2 may provide a core network disaster roaming service, the UE makes a determination based on these 2 pieces of information.

Optionally, the UE reads the system broadcast message after receiving the paging (paging) message sent by the base station in embodiment two: the base station informs the UE through RRC message

Precondition for this embodiment: the UE is in a registration state in the Op1 network, and the current UE is in a connected state in the Op1 network, namely RRC connection is formed between the current UE and the base station;

referring to fig. 5c, the flow is as follows:

the RAN receives an indication of the core network, such as an operation and maintenance (Operations and Maintenance, OAM) or AMF indication, from which the RAN determines Op1 to be in the core network discovery state:

the RAN determines UEs currently in a connected state in Op1 and sends an RRC message to each UE, the RRC message notifying the UE: op1 appears as a core network server, and in particular, op1 may be represented by a PLMN ID of Op 1;

op2 may provide a core network disaster roaming service, and Op2 may be represented by a PLMN ID of Op2

The RRC message may specifically be an RRC connection reconfiguration (RRC connection reconfiguration) message, a downlink information transfer (DL information transfer) message.

After receiving the RRC message, the UE determines that Op1 presents a core network server, and determines that Op2 corresponding to the base station can provide a core network Disaster roaming service, and then the UE initiates a registration request to Op2 by using the existing RRC connection.

It should be noted that, the scheme is also applicable to a scenario in which the UE enters the connected state from the idle state:

when the RAN receives a request for establishing connection with Op1 sent by the UE, specifically, carries the PLMN ID of Op1 in an RRC setup complete (RRC setup complete) message;

the RAN directly performs step 1 so that the UE can be directed to Op2 using the existing RRC connection.

Embodiment III: the base station forwards to the Op2 core network, and the Op2 core network informs the UE through NAS information

Precondition for this embodiment: the UE is in a registration state in the Op1 network, and enters a connection state from an idle state

Referring to fig. 5d, the flow is as follows:

1. optionally, the UE establishes an RRC connection with the RAN and sends a NAS message, such as a Service request message, or a registration message, to Op1

The RAN determines that Op1 is in a core network server state according to an indication of the core network, such as an operation and maintenance (Operations and Maintenance, OAM) or AMF indication, and Op2 may provide a core network Disaster roaming service:

the RAN forwards NAS information of the UE to the core network of the Op 2;

it should be noted that, if the UE is already in the connected state, the RAN may directly send a notification message to the core network element AMF of Op2, for notifying the AMF of Op2, where the UE is in the connected state in Op 1;

The AMF of op2 sends a NAS message to the UE, the NAS message being for notifying the UE:

op1 appears as a core network server, and in particular, op1 may be represented by a PLMN ID of Op 1;

op2 may provide a core network disaster roaming service, and Op2 may be represented by a PLMN ID of Op 2;

the NAS message may specifically be a downlink NAS transport message (DL NAS transport), a configuration update command (Configuration Update Command), and Notification (Notification).

After receiving the NAS message, the RAN sends the NAS message to the UE through the conventional RRC connection of the UE;

and 5, after receiving the NAS message, the UE determines that Op1 appears a core network server, determines that Op2 corresponding to the base station can provide a core network Disaster roaming service, and initiates a registration request to Op2 by using the conventional RRC connection.

According to the communication method provided by the embodiment of the application, the execution body can be a communication device. In the embodiment of the present application, a communication device is described by taking an example of a communication method performed by a communication device.

Referring to fig. 6, an embodiment of the present application provides a communication apparatus 600, including:

a first receiving module 601, configured to receive a first message from an access network device, where the first message includes information of one or more first PLMNs that provide a disaster roaming service;

A first sending module 602, configured to send, to the access network device, a second message to request one or more target PLMNs in the first PLMNs to provide services for the communication device, where the first message determines that DC occurs in a PLMN that provides services for the communication device.

In a possible implementation, the first message further contains information of one or more second PLMNs where DC occurs.

In a possible embodiment, the information of the second PLMN includes an identity of the second PLMN, and the information of the first PLMN includes an identity of the first PLMN.

In one possible embodiment, the apparatus further comprises:

And the fourth receiving module is used for receiving a paging message from the access network equipment before the first message is received from the access network equipment, wherein the paging message is used for indicating the communication device to receive a system broadcast message.

In a possible implementation manner, the first sending module is configured to:

and the terminal sends a registration request message to the access network equipment.

In one possible implementation, the first message is a radio resource control, RRC, message.

In one possible embodiment, the first receiving module is configured to:

the terminal receives the first message from the access network equipment under the condition that the terminal is in a connection state;

the first sending module is configured to:

and the terminal sends the second message to the access network equipment through the RRC connection between the terminal and the access network equipment.

In one possible embodiment, the apparatus further comprises:

a first establishing module, configured to establish an RRC connection with the access network device;

and the third sending module is used for sending the non-access stratum NAS message to the PLMN for providing service for the terminal through the RRC connection by the terminal.

An RRC connection reconfiguration message;

and transmitting the message by the downlink information.

In one possible implementation, determining that DC occurs for a PLMN serving the terminal according to the first message includes:

and determining that the PLMN for providing service for the communication device generates DC according to the identification of the PLMN for providing service for the communication device and the identification of the second PLMN.

the apparatus further comprises:

and the first determining module is used for determining the target PLMN according to the identification of the PLMN supported by the access network equipment and the identification of the first PLMN.

In a possible implementation manner, the first message is a first NAS message of a non-access stratum, and the first NAS message is sent by a core network device of the target PLMN and forwarded by the access network device to the communication apparatus.

In one possible embodiment, the apparatus further comprises:

and the fourth sending module is used for sending a second NAS message to core network equipment corresponding to the PLMN for providing service for the communication device through the access network equipment before the terminal receives the first message from the access network equipment, wherein the second NAS message is used for requesting to establish NAS connection with the PLMN for providing service for the terminal.

downlink NAS transmission information;

configuring an update command;

a notification message.

Referring to fig. 7, an embodiment of the present application provides a communication apparatus 700, including:

a second sending module 701, configured to send a first message, where the first message includes information of one or more first PLMNs that provide disaster roaming services;

a second receiving module 702, configured to receive a second message sent by a terminal, where the second message is used to request a target PLMN to provide services for the terminal, and the target PLMN is one of one or more first PLMNs.

In one possible embodiment, the apparatus further comprises:

and a fifth sending module, configured to send a paging message before sending the first message, where the paging message is used to instruct the terminal to receive a system broadcast message.

In a possible embodiment, the second receiving module is configured to:

and receiving a registration request message sent by the terminal.

In one possible implementation, the first message is an RRC message.

In a possible implementation manner, the second sending module is configured to:

the terminal sends a first message to the terminal under the condition that the terminal is in a connection state;

the second receiving module is configured to:

and receiving the second message sent by the terminal through the RRC connection with the terminal.

an RRC connection reconfiguration message;

and transmitting the message by the downlink information.

In a possible implementation manner, the first message further includes third information, where the third information is used to indicate an identifier of a PLMN supported by the communication device.

In one possible implementation, the first message is a first NAS message;

The second sending module is configured to:

receiving the first NAS message from a core network device of the target PLMN;

and sending the first NAS message to the terminal.

In one possible embodiment, the apparatus further comprises:

a fourth receiving module, configured to receive, before sending the first message, a second NAS message sent by the terminal, where the second NAS message is a NAS message sent to a core network device corresponding to a PLMN that provides a service for the terminal;

a sixth sending module, configured to send the second NAS message to the core network device;

the second NAS message is used for requesting to establish NAS connection with a PLMN providing service for the terminal.

In one possible embodiment, the apparatus further comprises:

a seventh sending module, configured to send, before sending the first message, a third NAS message to the core network device when the terminal is in a connected state, where the third NAS is configured to notify, to the core network device, that the terminal is in a connected state in a PLMN that provides services for the terminal.

In one possible embodiment, the apparatus further comprises:

and the second determining module is used for determining the target PLMN according to the identification of the PLMN supported by the communication device and the identification of the first PLMN.

downlink NAS transmission information;

configuring an update command;

a notification message.

Referring to fig. 8, an embodiment of the present application provides a communication apparatus 800, including:

a third receiving module 801, configured to receive a third message from an access network device, where the third message is used to determine to send a first NAS message to the access network device, where the first NAS message includes information of one or more first PLMNs that provide a disaster roaming service;

wherein the communication device is a core network device of a target PLMN of the one or more first PLMNs.

In one possible implementation, the third message includes:

and the access network equipment sends a third NAS message to the communication device, wherein the third NAS is used for notifying the communication device that the terminal is in a connection state in a PLMN for providing services for the terminal.

In a possible implementation manner, the third message is a message sent by the access network device to the second network, and the third message includes at least one of the following:

information of one or more second PLMNs of the disaster situation DC;

providing information of one or more first PLMNs of the disaster roaming service;

providing second indication information of the first NAS message;

and the information of the terminal, wherein the terminal is used for establishing RRC connection with the access network equipment and generating DC for the PLMN for providing services for the terminal.

downlink NAS transmission information;

configuring an update command;

a notification message.

The communication device in the embodiments of the present application may be an electronic device, for example, an electronic device with an operating system, or may be a component in an electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, terminals may include, but are not limited to, the types of terminals 11 listed above, other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., and embodiments of the application are not specifically limited.

The communication device provided in the embodiment of the present application can implement each process implemented by the embodiments of the methods of fig. 2 to 5d, and achieve the same technical effects, so that repetition is avoided, and no further description is provided herein.

Optionally, as shown in fig. 9, the embodiment of the present application further provides a communication device 900, including a processor 901 and a memory 902, where a program or an instruction that can be executed on the processor 901 is stored in the memory 902, and when the communication device 900 is a terminal, for example, the program or the instruction is executed by the processor 901, to implement each step of the foregoing embodiment of the communication method, and the same technical effects can be achieved. When the communication device 900 is a network device, the program or the instructions implement the steps of the above-mentioned communication method embodiment when executed by the processor 901, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the communication interface is used for receiving a first message from access network equipment by the terminal, the first message comprises information of one or more first public land mobile network PLMNs of which disaster situations DC occur and information of one or more first PLMNs of which disaster roaming services are provided; and under the condition that the terminal determines that the PLMN providing the service for the terminal generates DC according to the first message, the terminal sends a second message to the access network equipment, wherein the second message is used for requesting one or more target PLMNs in the first PLMNs to provide the service for the terminal. The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment, and the same technical effects can be achieved. Specifically, fig. 10 is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 1000 includes, but is not limited to: at least some of the components of the radio frequency unit 1001, the network module 1002, the audio output unit 1003, the input unit 1004, the sensor 1005, the display unit 1006, the user input unit 1007, the interface unit 1008, the memory 1009, and the processor 1010, etc.

Those skilled in the art will appreciate that terminal 1000 can also include a power source (e.g., a battery) for powering the various components, which can be logically connected to processor 1010 by a power management system so as to perform functions such as managing charge, discharge, and power consumption by the power management system. The terminal structure shown in fig. 10 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine some components, or may be arranged in different components, which will not be described in detail herein.

It should be understood that in the embodiment of the present application, the input unit 1004 may include a graphics processing unit (Graphics Processing Unit, GPU) 10041 and a microphone 10042, and the graphics processor 10041 processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 1006 may include a display panel 10061, and the display panel 10061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072. The touch panel 10071 is also referred to as a touch screen. The touch panel 10071 can include two portions, a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In this embodiment, after receiving downlink data from the network device, the radio frequency unit 1001 may transmit the downlink data to the processor 1010 for processing; in addition, the radio frequency unit 1001 may send uplink data to the network device. In general, the radio frequency unit 1001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 1009 may be used to store software programs or instructions and various data. The memory 1009 may mainly include a first memory area storing programs or instructions and a second memory area storing data, wherein the first memory area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 1009 may include volatile memory or nonvolatile memory, or the memory 1009 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory x09 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, and the like, and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 1010.

Wherein the radio frequency unit 1001 is configured to receive, by a terminal, a first message from an access network device, where the first message includes information of one or more first PLMNs that provide a disaster roaming service;

Optionally, the first message further contains information of one or more second PLMNs where DC occurs.

Optionally, the first message further includes first indication information, where the first indication information is used to indicate that DC occurs in a PLMN that provides services for the terminal.

Optionally, the information of the second PLMN includes an identity of the second PLMN, and the information of the first PLMN includes an identity of the first PLMN.

Optionally, the first message is a system broadcast message.

Optionally, before the terminal receives the first message from the access network device, the radio frequency unit 1001 is configured to:

the terminal receives a paging message from the access network device, where the paging message is used to instruct the terminal to receive a system broadcast message.

Optionally, the radio frequency unit 1001 is configured to:

Optionally, the first message is a radio resource control RRC message.

Optionally, the radio frequency unit 1001 is configured to:

a radio frequency unit 1001 for:

Optionally, the radio frequency unit 1001 is configured to:

the terminal establishes RRC connection with the access network equipment;

and the terminal sends a non-access stratum NAS message to a PLMN for providing service for the terminal through the RRC connection.

Optionally, the RRC message includes one or more of:

an RRC connection reconfiguration message;

and transmitting the message by the downlink information.

Optionally, the determining, by the terminal, that DC occurs in a PLMN for providing services to the terminal according to the first message includes:

and the terminal determines that the PLMN for providing service for the terminal generates DC according to the identification of the PLMN for providing service for the terminal and the identification of the second PLMN.

Optionally, the first message further includes third information, where the third information is used to indicate an identifier of a PLMN supported by the access network device;

the method further comprises the steps of:

Optionally, the first message is a first NAS message of a non-access stratum, and the first NAS message is sent by a core network device of the target PLMN and forwarded by the access network device to the terminal.

Optionally, before the terminal receives the first message from the access network device, the processor 1010 is configured to:

and the terminal sends a second NAS message to core network equipment corresponding to the PLMN for providing service for the terminal through the access network equipment, wherein the second NAS message is used for requesting to establish NAS connection with the PLMN for providing service for the terminal.

Optionally, the first NAS message includes one or more of:

downlink NAS transmission information;

configuring an update command;

a notification message.

The embodiment of the application also provides a network device, which comprises a processor and a communication interface, wherein when the network device is the access network device, the communication interface is used for sending a first message by the access network device, and the first message comprises information of one or more first PLMNs for providing disaster roaming service; the access network device receives a second message sent by the terminal, where the second message is used to request a target PLMN to provide services for the terminal, and the target PLMN is one of one or more first PLMNs. When the network device is the access network device, the core network device receives a third message from the access network device, where the third message is used for the core network device to determine to send a first NAS message to the access network device, where the first NAS message includes information of one or more first PLMNs that provide a disaster roaming service; the core network device is a network device of a target PLMN in one or more first PLMNs. . The network device embodiment corresponds to the network device method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network device embodiment, and the same technical effects can be achieved.

Specifically, the embodiment of the application also provides a network device. As shown in fig. 11, the network device 1100 includes: an antenna 111, a radio frequency device 112, a baseband device 113, a processor 114 and a memory 115. The antenna 111 is connected to a radio frequency device 112. In the uplink direction, the radio frequency device 112 receives information via the antenna 111, and transmits the received information to the baseband device 113 for processing. In the downlink direction, the baseband device 113 processes information to be transmitted, and transmits the processed information to the radio frequency device 112, and the radio frequency device 112 processes the received information and transmits the processed information through the antenna 111.

The method performed by the network device in the above embodiment may be implemented in the baseband apparatus 113, the baseband apparatus 113 including a baseband processor.

The baseband apparatus 113 may, for example, include at least one baseband board, where a plurality of chips are disposed, as shown in fig. 11, where one chip, for example, a baseband processor, is connected to the memory 115 through a bus interface, so as to call a program in the memory 115 to perform the network device operation shown in the above method embodiment.

The network device may also include a network interface 116, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network device 1100 of the embodiment of the present invention further includes: instructions or programs stored in the memory 115 and capable of running on the processor 114, the processor 114 invokes the instructions or programs in the memory 115 to perform the method performed by the modules shown in fig. 7, and achieve the same technical effects, and are not repeated here.

Specifically, the embodiment of the application also provides a network device. As shown in fig. 12, the network apparatus 1200 includes: a processor 1201, a network interface 1202, and a memory 1203. The network interface 1202 is, for example, a common public radio interface (common public radio interface, CPRI).

Specifically, the network device 1200 of the embodiment of the present invention further includes: instructions or programs stored in the memory 1203 and capable of being executed by the processor 1201, the processor 1201 calls the instructions or programs in the memory 1203 to execute the method executed by each module shown in fig. 8, and achieve the same technical effects, so that repetition is avoided and thus a detailed description is omitted.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the foregoing communication method embodiment, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used for running a program or an instruction, implementing each process of the above communication method embodiment, and achieving the same technical effect, so as to avoid repetition, and no redundant description is provided herein.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product, where the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement each process of the foregoing embodiments of the communication method, and achieve the same technical effects, so that repetition is avoided, and details are not repeated herein.

The embodiment of the application also provides a communication system, which comprises: a terminal, an access network device and a core network device, the terminal being operable to perform the steps of the terminal-side method as described above, the access network device being operable to perform the steps of the access network device-side method as described above, the core network device being operable to perform the steps of the core network device-side method as described above.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A method of communication, comprising:

the terminal receives a first message from the access network device, the first message containing information of one or more first public land mobile network PLMNs providing disaster roaming services;

and in the case that the terminal determines that the disaster condition DC occurs in the PLMN for providing the service for the terminal, the terminal sends a second message to the access network equipment, wherein the second message is used for requesting one or more target PLMNs in the first PLMNs to provide the service for the terminal.

2. The method of claim 1, wherein the first message further contains information of one or more second PLMNs where DC is occurring.

3. The method of claim 1, wherein the terminal determining that a PLMN serving the terminal is DC-generating comprises:

4. The method of claim 1, wherein the first message further comprises first indication information indicating that DC is occurring in a PLMN serving the terminal.

5. The method of claim 2, wherein the information of the second PLMN comprises an identification of the second PLMN and the information of the first PLMN comprises an identification of the first PLMN.

6. The method according to claim 1 or 5, wherein,

the first message is a system broadcast message.

7. The method of claim 6, wherein prior to the terminal receiving the first message from the access network device, the method further comprises:

8. The method of claim 1, wherein the terminal sending a second message to the access network device comprises:

9. The method according to claim 1 or 5, wherein,

The first message is a radio resource control, RRC, message.

10. The method of claim 9, wherein the step of determining the position of the substrate comprises,

the terminal receives a first message from an access network device, including:

the terminal sends a second message to the access network device, including:

11. The method according to claim 9, wherein the method further comprises:

the terminal establishes RRC connection with the access network equipment;

and the terminal sends a non-access stratum NAS message to core network equipment corresponding to the PLMN for providing service for the terminal through the RRC connection.

12. The method of claim 9, wherein the RRC message includes one or more of:

an RRC connection reconfiguration message;

and transmitting the message by the downlink information.

13. The method of claim 5, wherein the terminal determining that a PLMN serving the terminal is DC-generating comprises:

14. The method of claim 5, wherein the first message further includes third information, the third information being used to indicate an identity of a PLMN supported by the access network device;

the method further comprises the steps of:

15. The method according to claim 1 or 5, wherein,

the first message is a first non-access stratum NAS message.

16. The method of claim 15, wherein prior to the terminal receiving the first message from the access network device, the method further comprises:

17. The method of claim 15, wherein the first NAS message comprises one or more of:

downlink NAS transmission information;

configuring an update command;

a notification message.

18. A method of communication, comprising:

19. The method of claim 18, wherein the first message further contains information of one or more second PLMNs where DC is occurring.

20. The method of claim 18, wherein the first message further comprises first indication information indicating that DC is occurring in a PLMN serving the terminal.

21. The method of claim 19, wherein the information of the second PLMN comprises an identification of the second PLMN and the information of the first PLMN comprises an identification of the first PLMN.

22. The method according to claim 18 or 21, wherein,

the first message is a system broadcast message.

23. The method of claim 22, wherein prior to the access network device sending the first message, the method further comprises:

the access network device sends a paging message, where the paging message is used to instruct the terminal to receive a system broadcast message.

24. The method of claim 18, wherein the access network device receives the second message sent by the terminal, comprising:

and the access network equipment receives the registration request message sent by the terminal.

25. The method according to claim 18 or 21, wherein,

the first message is an RRC message.

26. The method of claim 25, wherein the step of determining the position of the probe is performed,

the access network device sends a first message, including:

the access network equipment sends a first message to the terminal under the condition that the terminal is in a connection state;

the access network device receives a second message sent by the terminal, including:

and the access network equipment receives the second message sent by the terminal through the RRC connection with the terminal.

27. The method of claim 25, wherein the RRC message includes one or more of:

an RRC connection reconfiguration message;

and transmitting the message by the downlink information.

28. The method of claim 21, wherein the first message further includes third information, the third information indicating an identity of a PLMN supported by the access network device.

29. The method of claim 21, wherein the first message is a first NAS message;

the access network device sends a first message, including:

the access network device receives the first NAS message from the core network device of the target PLMN;

and the access network equipment sends the first NAS message to the terminal.

30. The method of claim 29, wherein prior to the access network device sending the first message, the method further comprises:

the access network equipment receives a second NAS message sent by the terminal, wherein the second NAS message is a NAS message sent to core network equipment corresponding to a PLMN for providing service for the terminal;

the access network equipment sends the second NAS message to the core network equipment;

31. The method of claim 29, wherein prior to the access network device sending the first message, the method further comprises:

and under the condition that the terminal is in a connection state, the access network equipment sends a third NAS message to the core network equipment, wherein the third NAS is used for informing the core network equipment that the terminal is in the connection state in a PLMN for providing services for the terminal.

32. The method of claim 29, further comprising:

and the access network equipment determines the target PLMN according to the identification of the PLMN supported by the access network equipment and the identification of the first PLMN.

33. The method of claim 29, wherein the first NAS message comprises one or more of:

downlink NAS transmission information;

configuring an update command;

a notification message.

34. A method of communication, comprising:

the core network device is one or more core network devices of target PLMNs in the first PLMN.

35. The method of claim 34, wherein the first message further contains information of one or more second PLMNs where DC is occurring.

36. The method of claim 34, wherein the first message further comprises first indication information indicating that DC is occurring in a PLMN serving the terminal.

37. The method of claim 34, wherein the third message comprises:

38. The method of claim 34, wherein the third message comprises:

and the access network equipment sends a third NAS message to the core network equipment, wherein the third NAS is used for notifying the core network equipment that the terminal is in a connection state in a PLMN for providing services for the terminal.

39. The method of claim 34, wherein the third message is a message sent by the access network device to the second network, the third message comprising at least one of:

information of one or more second PLMNs of the disaster situation DC;

providing second indication information of the first NAS message;

40. The method of claim 34 or 39, wherein the information of the second PLMN comprises an identity of the second PLMN and the information of the first PLMN comprises an identity of the first PLMN.

41. The method of claim 34, wherein the first NAS message comprises one or more of:

downlink NAS transmission information;

configuring an update command;

a notification message.

42. A communication device, comprising:

43. A communication device, comprising:

44. A communication device, comprising:

45. A terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the communication method of any one of claims 1 to 17.

46. A network device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the communication method of any one of claims 18 to 33, or the steps of the communication method of any one of claims 34 to 41.

47. A readable storage medium, characterized in that the readable storage medium stores thereon a program or instructions, which when executed by a processor, implements the communication method of any one of claims 1 to 17, or implements the steps of the communication method of any one of claims 18 to 33, or implements the steps of the communication method of any one of claims 34 to 41.