WO2018068536A1 - 网络切换方法及终端 - Google Patents

网络切换方法及终端 Download PDF

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Publication number
WO2018068536A1
WO2018068536A1 PCT/CN2017/091169 CN2017091169W WO2018068536A1 WO 2018068536 A1 WO2018068536 A1 WO 2018068536A1 CN 2017091169 W CN2017091169 W CN 2017091169W WO 2018068536 A1 WO2018068536 A1 WO 2018068536A1
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Prior art keywords
plmn
network
terminal
plmns
system message
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PCT/CN2017/091169
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English (en)
French (fr)
Inventor
姜印清
汤超
柳晓见
阮攀
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华为技术有限公司
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Priority to CN201780003376.XA priority Critical patent/CN108235827A/zh
Priority to EP17860112.6A priority patent/EP3525520B1/en
Publication of WO2018068536A1 publication Critical patent/WO2018068536A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a network switching method and a terminal.
  • the Multi-Operator Core Network enables multiple operators to share access networks, thus reducing the difficulty of deploying communication networks.
  • the eNodeB broadcasts a Public Land Mobile Network (PLMN) list to which the current cell belongs in System Message 1 (System Information Block Type 1, SIB1).
  • PLMN Public Land Mobile Network
  • SIB1 System Information Block Type 1, SIB1
  • the first one is the primary PLMN, and the others are all from the PLMN.
  • the use of the base station resources by the master/slave PLMN can be guaranteed according to the configured proportion, and the primary operator does not enjoy certain privileges for the use of the base station resources.
  • the UE After the UE is powered on, the UE performs the PLMN selection according to the description of 3GPP 23122 section 4.4.
  • the UE For example, in the SIB1, there is a PLMN that the UE needs to register, and the UE indicates to the eNodeB the PLMN that it selects.
  • the eNodeB selects an S1 interface according to the PLMN selected by the UE, and connects to the core network node of the PLMN.
  • the S1 interface of the core network and the eNodeB is broken. After the eNodeB detects that the S1 interface is broken, the eNodeB sends a paging message to the UE for system message change. In SystemInformationBlockType1, the faulty network will be deleted and the UE is expected to be registered to other networks.
  • the embodiment of the present application provides a network switching method and a terminal, which can achieve the problem of low handover efficiency when performing network switching.
  • an embodiment of the present application provides a network switching method.
  • the system includes: receiving, by the terminal, a system message sent by the network device, where the system message includes information of at least two public land mobile network PLMNs, where the information of the at least two PLMNs respectively include the status of the corresponding PLMN, and the at least two PLMNs belong to the multi-operator shared network.
  • the MOCN one of the at least two PLMNs is a PLMN currently registered by the terminal; and the terminal selects at least two PLMNs according to the information of the at least two PLMNs according to the status of the currently registered PLMN, according to the status of the currently registered PLMN.
  • the PLMN other than the registered PLMN and whose status is available for registration.
  • the terminal It is judged directly according to the system message that when the current network is unavailable, the PLMN is selected according to the PLMN list and registered.
  • the network search is not required during the handover process, and the switching efficiency is higher.
  • the system message includes a system message 1, where the system message 1 includes identification information of the PLMN, and the identifier information of the PLMN includes a PLMN ID and a parameter corresponding to the cellReservedForOperatorUse.
  • the status of the PLMN includes a parameter corresponding to the cell reservation condition cellReservedForOperatorUse of the identity information of the PLMN.
  • the foregoing terminal determines, according to the status of the currently registered PLMN, that the currently registered PLMN is unavailable, and the terminal determines that the currently registered PLMN is unavailable, when the terminal determines that the parameter corresponding to the cellReservedForOperatorUse of the previously registered PLMN is reserved.
  • the PLMN in which the status is available includes a PLMN in which the parameter corresponding to cellReservedForOperatorUse in the at least two PLMNs is not reserved.
  • the embodiment of the present application can determine whether the current PLMN is available according to the parameter corresponding to the cellReservedForOperatorUse, and the efficiency is higher.
  • an embodiment of the present application provides a terminal.
  • the system includes: a receiver, configured to receive a system message sent by a network device, where the system message includes information of at least two public land mobile network PLMNs, where information of the at least two PLMNs respectively includes states of their corresponding PLMNs, At least two PLMNs belong to a multi-operator shared network MOCN, one of the at least two PLMNs is a PLMN currently registered by the terminal, and a processor is configured to determine the currently registered according to a status of the currently registered PLMN. When the PLMN is unavailable, according to the information of the at least two PLMNs, the PLMNs of the at least two PLMNs except the currently registered PLMN and whose states are available for registration are selected for registration.
  • the system message includes the system message 1.
  • the status of the PLMN includes a parameter corresponding to the cell reservation condition cellReservedForOperatorUse of the PLMN.
  • the processor is further configured to: when it is determined that the parameter corresponding to the cellReservedForOperatorUse of the pre-registered PLMN is reserved, determine that the currently registered PLMN is unavailable.
  • the PLMN in which the status is available includes a PLMN in which the parameter corresponding to cellReservedForOperatorUse in the at least two PLMNs is not reserved.
  • an embodiment of the present application provides a computer readable storage medium, comprising instructions, when executed on a computer, causing a computer to perform the method as in the first aspect and its alternative implementations.
  • an embodiment of the present application provides a computer program product, comprising instructions, when executed on a computer, causing the computer to perform the method as in the first aspect and its alternative implementation.
  • FIG. 1 is a schematic diagram of an MOCN architecture applicable to a network switching method according to an embodiment of the present application
  • FIG. 2 is a schematic flow chart of a network switching method
  • FIG. 3 is a signaling interaction diagram of a network switching method according to an embodiment of the present disclosure
  • Figure 4 is a network architecture diagram
  • FIG. 5 is a signaling interaction diagram of another network switching method according to an embodiment of the present disclosure.
  • FIG. 6 is an example of a system message 1 according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • the embodiment of the present application provides a network switching method and a terminal. It can be applied to the network switching process based on the MOCN. Specifically, the terminal directly judges according to the system message that when the current network is unavailable, the PLMN is selected according to the PLMN list and registered. The network search is not required during the handover process, and the handover efficiency is higher and the user experience is better.
  • FIG. 1 is a schematic diagram of an MOCN architecture applicable to a network switching method according to an embodiment of the present application.
  • the MOCN network includes: at least two core networks 10, an access network 20, and a terminal 30, wherein the core network 10 and the access network 20 are connected through an S1 interface.
  • At least two core networks 10 include a core network 101 and a core network 102, which belong to different operators.
  • the networks of different operators can be distinguished by the PLMN identifier.
  • the network of the A operator corresponding to the core network 101 can be identified by the PLMN1.
  • the network of the B operator corresponding to the core network 102 can be identified by the PLMN 2.
  • the terminal first searches for the network of the A-operator-owned system. For example, the terminal first searches for the AG network of the A carrier. After the AG network of the A carrier does not have a service, the terminal continues to search for the 3G network of the A carrier. After the AG network of the A carrier does not have a service, the terminal continues to search for the 2G network.
  • the terminal searches for the network of the A-operator's ownership system and finds that there is no service, it starts to search for other carrier networks. These other networks may not all have a protocol relationship with the A-operator network, that is, not all terminals are allowed to register until the search is performed. Allow the registered B carrier's network to be registered to the B carrier's network of a certain standard.
  • the application of the present application finds that the services provided by different operators of different networks of the same carrier are generally different. Generally, the network of one type of the operator is damaged, and the networks of other standards are actually affected. There is also a problem in the service. Therefore, when a terminal selects another network to register, the terminal generally does not register successfully. Even if the registration is successful, the quality of service will decrease, affecting the user experience.
  • the embodiment of the present application provides a network switching method and a terminal. If the terminal 30 registers with the core network 101 of the network of the network operator A, when the core network 101 fails, and the normal communication between the access network 20 and the core network 101 is impossible, the access network 20 sends a system message to the terminal 30. 1.
  • the system message 1 carries a PLMN list and an indication that the network corresponding to the PLMN1 is unavailable (ie, the core network 101 indicating the network corresponding to the PLMN1 has no service).
  • an available PLMN for example, a network corresponding to the PLMN2
  • the PLMN is selected according to the PLMN list and registered. The network search is not required during the handover process, and the switching efficiency is higher.
  • the terminal 30 may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to the wireless modem, and various forms of User Equipment (UE), mobile stations ( Mobile station, MS), terminal, terminal equipment, etc.
  • UE User Equipment
  • MS Mobile station
  • terminal equipment etc.
  • the access network 20 includes an access network device, which may be a device deployed in the wireless access network to provide wireless communication functionality to the terminal.
  • the apparatus may include various forms of macro base stations, micro base stations, relay stations, access points, and the like.
  • the names of devices with base station functions may be different, for example, in an LTE network, called an evolved NodeB (eNB or eNodeB), in the third generation.
  • eNB evolved NodeB
  • 3G network it is called a Node B and so on.
  • access network devices For convenience of description, in the present application, the above devices for providing wireless communication functions to terminals are collectively referred to as access network devices.
  • the core network 10 includes core network devices, and the core network devices corresponding to different PLMNs may also be different.
  • the device can provide a user connection, management of the user, and completion of the bearer for the service, and is a device that provides an interface to the external network by the bearer network.
  • the establishment of the user connection includes functions such as mobility management (MM), call management (CM), switching/routing, and recording notification (in combination with the completion of the connection of the intelligent network service to the peripheral device of the intelligent network).
  • MM mobility management
  • CM call management
  • switching/routing switching/routing
  • recording notification in combination with the completion of the connection of the intelligent network service to the peripheral device of the intelligent network.
  • User management includes user description, QoS (Quality of Service), user communication record (Accounting), dialogue with intelligent network platform to provide virtual home environment, security (the corresponding security measures provided by the authentication center include Security management of mobile services and security of access to external networks).
  • the basic services that the core network can provide include mobile office, e-commerce, communication, entertainment services, travel and location-based services, telemetry simple messaging services (monitoring control), and so on.
  • MME Mobility Management Entity
  • SGW Serving GateWay
  • LTE Long Term Evolution
  • the above-mentioned devices that provide user connections, management of users, and bearers for services are provided as interfaces of the bearer network to the external network, and are collectively referred to as core network devices.
  • FIG. 3 is a signaling interaction diagram of a network handover method according to an embodiment of the present disclosure. As shown in FIG. 2, the method specifically includes:
  • the network device sends a system message.
  • the system message includes information of at least two PLMNs, the information of the at least two PLMNs respectively include the status of the corresponding PLMN, the at least two PLMNs belong to the MOCN, and one of the at least two PLMNs is currently registered by the terminal.
  • PLMN PLMN.
  • the system message includes a PLMN list including at least information of two PLMNs, the information of the PLMN including the identity and status of the PLMN, and the like.
  • the PLMN list includes the PLMN information currently registered by the terminal, and the PLMN information currently registered by the terminal indicates that the currently registered PLMN is unavailable.
  • the network device may send the PLMN list to which the current cell belongs through SIB1.
  • SIB1 For details of SIB1, see 3GPP TS 36.331.
  • the PLMN list includes a PLMN identity (PLMN-Identity, PLMNID) and a cell reservation (cellReservedForOperatorUse).
  • PLMNID PLMN-Identity
  • cellReservedForOperatorUse When the parameter corresponding to cellReservedForOperatorUse is not reserved, the PLMN is available; when reserved, the PLMN is unavailable.
  • the PLMNID consists of the Mobile Country Code (MCC) and the Mobile Network Code (MNC) of the local SIM card home network.
  • MCC Mobile Country Code
  • MNC Mobile Network Code
  • the MCC and the MNC generally match the International Mobile Subscriber Identification Number (IMSI) prefix of the local SIM card.
  • IMSI International Mobile Subscriber Identification Number
  • the network device may include an access network device and a core network device.
  • the parameter corresponding to the cellReservedForOperatorUse of the PLMN corresponding to the core network device in the SIB1 may be changed to reserved, and the confirmed SIB1 is sent to the terminal.
  • the access network device detects that it is disconnected from the S1 interface of the core network device, or the access network device receives an indication that the network sent by the core network device is unavailable, it determines that it cannot communicate with the core network device.
  • the terminal receives a system message sent by the network device. Specifically, the network device may send a paging message to the terminal, where the paging message is used to indicate a system message change. After receiving the paging message, the terminal receives SIB1.
  • the terminal determines, according to the status of the currently registered PLMN, when determining that the currently registered PLMN is unavailable. According to the information of at least two PLMNs, the PLMNs of at least two PLMNs other than the currently registered PLMN and whose status is available for registration are selected for registration.
  • the terminal determines whether the current network is unavailable or not according to the parameter corresponding to cellReservedForOperatorUse in the system message.
  • This network search is no longer performed when it is determined that the current PLMN is unavailable.
  • the PLMN selection is performed according to the PLMN list carried in the system message. No longer select rplmn registration, search for other available PLMNs in the LMN list for registration. Registration is successful and enters a service state.
  • the terminal may also maintain a blacklist list, and determine that the current PLMN is unavailable, and when the LPMN is selected, the blacklist is matched. If the PLMN is in the blacklist, the terminal does not reside in the PLMN, and the reselection PLMN operation is started.
  • the blacklist can be determined based on the contents of the system message.
  • the cell search and the PLMN selection process are optimized, and the rPLMN LTE (4G)/UMTS (3G)/GSM (2G) all-standard search is omitted.
  • Reduce the time consumption of about 60S quickly switch to other available networks in the shared network, and reduce the search time of the original network.
  • the background of the MOCN network is actually to solve the problem of incomplete coverage of the operator network, if multiple operators The network belongs to the MOCN. Generally speaking, the multiple operators have a cooperative relationship, and even the multiple operators will set each other to be EPLMN (peer-to-peer network).
  • the network of one of the multiple operators is damaged, and the networks of other standards are also affected, and the business will have problems. Therefore, quickly switching to another operator's network, especially the network of the peer-to-peer network, can improve the user's communication experience. For example, if the A operator and the B carrier are MOCN, and as long as any one of the A operators' networks (4G, 3G, or 2G) is abnormal, the terminal can directly search the BG's 4G network (the terminals are generally set to 4G first). ) to get the normal service in the fastest way.
  • FIG. 4 is a diagram of a network architecture. As shown in FIG. 4, the terminal interacts with the access network device in the network device through an access layer (AS) protocol. The terminal interacts with the core network device in the network device through a non-access stratum (NAS) protocol.
  • the access layer protocol is an underlying protocol of a non-access stratum protocol.
  • the network switching method in the embodiment of the present application is further introduced in the following with reference to the network architecture shown in FIG.
  • FIG. 5 is a signaling interaction diagram of another network switching method according to an embodiment of the present disclosure. This method is applicable to the terminal shown in FIG. The method specifically includes the following steps:
  • the terminal selects a PLMN registration process.
  • the PLMN After the terminal is powered on, the PLMN needs to be selected for registration. For the process, refer to the related description in 3GPP 23122.
  • the network needs to register the network with the PLMN ID 234-34 after booting, that is, the network corresponding to the PLMN ID indicated by the 602 part in the PLMN list shown in FIG. 6 (for example, in FIG. 1
  • the PLMN ID corresponding to the core network 101 shown may be 234-34), where 234 is a mobile country code (MCC) and 34 is a mobile network code (MNC).
  • MCC mobile country code
  • MNC mobile network code
  • the SIB1 mainly includes related parameters of the broadcast cell access and the cell selection, scheduling information of the SI message, and the like.
  • the system message 1 includes a PLMN list and a field such as the cellReservedForOperatorUse.
  • the network device After the network device fails to communicate properly or other problems, the network device needs to modify the system message 1 and notify the terminal. Generally, the cellReservedForOperatorUse field under the PLMN ID corresponding to the network is repaired. Changed to reserved. Specifically, the network device first sends a Paging message to the access layer of the terminal, where the message is used to indicate that the system message 1 is changed. After receiving the Paging message, the terminal AS layer needs to re-resolve system message 1.
  • the terminal AS layer parses the SIB1, and determines that the parameter corresponding to the cellReservedForOperatorUse corresponding to the currently registered PLMN1 (the network with the PLMN ID of 234-34 shown in FIG. 6) is reserved, and determines that the PLMN1 network is unavailable, and the terminal enters the no-service state.
  • the terminal AS layer carries the cause value (that is, the parameter corresponding to the cellReservedForOperatorUse of the PLMN1 is reserved), and reports the no service status to the terminal NAS layer.
  • the terminal NAS layer determines that the terminal needs to perform the PLMN handover process after the service is out of service.
  • the terminal NAS layer performs PLMN selection according to the list according to the PLMN list obtained by parsing the system message 1.
  • the PLMN list in the system message 1 shown in FIG. 6 includes two PLMNs, and the PLMN ID is 234-34.
  • the network and the network indicated by the PLMN ID 234-30 (the PLMN ID indicated by the 601 part shown in FIG. 6) (for example, the PLMN ID corresponding to the core network 102 shown in FIG. 1 may be 234-30).
  • the terminal NAS layer selects a PLMN in which the parameter of the corresponding cellReservedForOperatorUse in the PLMN list is not reserved. For example, as shown in FIG. 6, since the parameter of the cellReservedForOperatorUse corresponding to the network with the PLMN ID of 234-34 is modified to be reserved, Select the network with the PLMN ID 234-30 to register.
  • the terminal NAS layer instructs the AS layer to register according to its selected PLMN 2 (for example, the network with the PLMN ID 234-30 shown in FIG. 6).
  • the terminal AS layer performs cell search, and after the cell search succeeds, initiates a registration request to the network device corresponding to the PLMN 2. After the network device returns the response information of the successful registration of the PLMN2, the terminal enters the service state.
  • the terminal AS layer can also maintain the blacklist list.
  • the LPMN is selected, and the blacklist is matched. If the PLMN is in the blacklist, the terminal does not reside in the PLMN, and the reselection of the PLMN is started. .
  • FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • the terminal includes a transmitter 701, a receiver 702, a processor 703, and a memory 704.
  • Transmitter 701, receiver 702, processor 703, and memory 704 may be coupled by a bus (shown in the figures).
  • the transmitter 701 is configured to generate an uplink signal, and the uplink signal is transmitted to the access network device described in the foregoing embodiment via an antenna, for example, a registration request sent by the terminal to the network device, and the like.
  • the receiver 702 is configured to adjust (eg, filter, amplify, downconvert, digitize, etc.) signals received from the antenna, typically from a network device, such as for receiving a Paging message sent by the network device, system message 1 and the like.
  • the processor 703 controls and manages the actions of the terminal for performing the processing performed by the terminal in the above embodiment. For example, other processes for controlling a terminal according to receiving system messages and/or the techniques described herein.
  • the processor 703 may include an AS module and a NAS module.
  • the AS module is configured to parse the system message 1 and determine whether the current PLMN is available. When the current PLMN is unavailable, the NAS module is reported.
  • the NAS module is configured to select, according to the PLMN list in the system message 1, that the PLMN list is registered except for the currently registered PLMN and the status is available.
  • the processor 703 is configured to support the terminal to perform the processes S310 and S320 in FIG. 3, and the processes 501, 502, and 503 in FIG.
  • the memory 604 is used to store program codes and data for the terminal.
  • Figure 7 only shows a simplified design of the terminal.
  • an access network device can include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., but all The base stations in which the present invention can be implemented are all within the scope of the present invention.
  • the controller/processor for performing the above terminal of the present invention the function of the access network device may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and field programmable. Gate array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.

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Abstract

本发明实施例涉及一种网络切换方法及终端。包括：终端接收网络设备发送的***消息，***消息包括至少两个公共陆地移动网络PLMN的信息，至少两个PLMN的信息分别包括其对应的PLMN的状态，至少两个PLMN属于多运营商共享网络MOCN，至少两个PLMN中的一个为终端当前注册的PLMN；终端根据当前注册的PLMN的状态，在确定当前注册的PLMN不可用时，根据至少两个PLMN的信息，选择至少两个PLMN中除当前注册的PLMN以外且状态为可用的PLMN进行注册。通过本申请实施例，终端直接根据***消息判断，当前网络不可用时，根据PLMN列表选择PLMN并进行注册。切换过程中不需要进行本网搜索，切换效率更高。

Description

网络切换方法及终端
本申请要求于2016年10月13日提交中国专利局、申请号为201610895165.9、发明名称为“一种MOCN网络切换优化的方法和设备”的中国专利申请的优先权，本申请同时要求于2017年4月25日提交中国专利局、申请号为201710278555.6、发明名称为“网络切换方法及终端”的中国专利申请的优先权，两者全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及通信技术领域，尤其涉及一种网络切换方法及终端。
背景技术
随着通信技术的不断发展，高覆盖率一直是移动通信网络所追求的。多运营商共享网络(Multi-Operator Core Network，MOCN)能够实现多运营商之间共享接入网，从而降低通信网络部署的难度。
在MOCN中，eNodeB在***消息1(SystemInformationBlockType1，SIB1)中会广播当前小区所属的公共陆地移动网络(Public Land Mobile Network，PLMN)列表。在PLMN列表中，第一个是主PLMN，其他的都是从PLMN。主/从PLMN对基站资源的使用可以按照配置的比例进行保障，主运营商不对基站资源的使用享有某种特权。UE在开机后，还是按照3GPP 23122section 4.4的描述进行PLMN选择，如SIB1中有UE需要注册的PLMN，UE向eNodeB指示其选择的PLMN。eNodeB根据UE选择的PLMN来选择S1接口，并连接到该PLMN的核心网节点。
当发生某些灾难时，核心网和eNodeB的S1接口断掉了，eNodeB检查到S1接口断掉后，会给UE发***消息变更的paging(寻呼)。在SystemInformationBlockType1中，会将故障网络删除掉，期望UE能注册到其他网络上去。
通常在进行网络切换时，在确定网络无服务后，需要遍历PLMN下的LTE/UMTS/GSM等所有制式，才能切换成功，切换效率低，具体可以参考3GPP 36304。
发明内容
本申请实施例提供了一种网络切换方法及终端，可实现在进行网络切换时，切换效率低的问题。
第一方面，本申请实施例提供了一种网络切换方法。包括：终端接收网络设备发送的***消息，***消息包括至少两个公共陆地移动网络PLMN的信息，至少两个PLMN的信息分别包括其对应的PLMN的状态，至少两个PLMN属于多运营商共享网络MOCN，至少两个PLMN中的一个为终端当前注册的PLMN；终端根据当前注册的PLMN的状态，在确定当前注册的PLMN不可用时，根据至少两个PLMN的信息，选择至少两个PLMN中除当前注册的PLMN以外且状态为可用的PLMN进行注册。通过本申请实施例，终端 直接根据***消息判断，当前网络不可用时，根据PLMN列表选择PLMN并进行注册。切换过程中不需要进行本网搜索，切换效率更高。
在一个可选地实现中，所述***消息包括***消息1，其中，***消息1中包括PLMN的标识信息，该PLMN的标识信息包括PLMN ID以及cellReservedForOperatorUse对应的参数。其中，PLMN的状态包括PLMN的标识信息的小区预留情况cellReservedForOperatorUse对应的参数。前述终端根据当前注册的PLMN的状态，在确定所述当前注册的PLMN不可用包括：终端确定前注册的PLMN的cellReservedForOperatorUse对应的参数为reserved时，确定所述当前注册的PLMN不可用。所述状态为可用的PLMN包括，所述至少两个PLMN中cellReservedForOperatorUse对应的参数为not reserved的PLMN。
通过本申请实施例可以根据cellReservedForOperatorUse对应的参数来判断当前PLMN是否可用，效率更高。
第二方面，本申请实施例提供了一种终端。包括：接收器，用于接收网络设备发送的***消息，所述***消息包括至少两个公共陆地移动网络PLMN的信息，所述至少两个PLMN的信息分别包括其对应的PLMN的状态，所述至少两个PLMN属于多运营商共享网络MOCN，所述至少两个PLMN中的一个为所述终端当前注册的PLMN；处理器，用于根据当前注册的PLMN的状态，在确定所述当前注册的PLMN不可用时，根据所述至少两个PLMN的信息，选择所述至少两个PLMN中除所述当前注册的PLMN以外且状态为可用的PLMN进行注册。
在一个可选地实现中，所述***消息包括***消息1所述PLMN的状态包括所述PLMN的小区预留情况cellReservedForOperatorUse对应的参数。所述处理器还用于，确定前注册的PLMN的cellReservedForOperatorUse对应的参数为reserved时，确定所述当前注册的PLMN不可用。所述状态为可用的PLMN包括，所述至少两个PLMN中cellReservedForOperatorUse对应的参数为not reserved的PLMN。
第三方面，本申请实施例提供了一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行如第一方面以及其可可选的实现方式中的的方法。
第四方面，本申请实施例提供了一种计算机程序产品，包括指令，当其在计算机上运行时，使得计算机执行如第一方面以及其可选地实现方式中的方法。
附图说明
图1为本申请实施例提供的一种网络切换方法所适用的MOCN架构图；
图2为一种网络切换方法的流程示意图；
图3为本申请实施例提供的一种网络切换方法的信令交互图；
图4为一种网络架构图；
图5为本申请实施例提供的另一种网络切换方法的信令交互图；
图6为本申请实施例提供的一个***消息1示例；
图7为本申请实施例提供的一种终端结构示意图。
具体实施方式
本申请实施例提供了一种网络切换方法及终端。可以应用于基于MOCN中的网络切换过程中，具体地，终端直接根据***消息判断，当前网络不可用时，根据PLMN列表选择PLMN并进行注册。切换过程中不需要进行本网搜索，切换效率更高，用户体验更好。
图1为本申请实施例提供的一种网络切换方法所适用的MOCN架构图。如图1所示，该MOCN网络包括：至少两个核心网10、接入网20以及终端30，其中，核心网10与接入网20之间通过S1接口连接。至少两个核心网10包括核心网101以及核心网102，分别属于不同的运营商，不同运营商的网络可通过PLMN标识来区分，例如，核心网101对应的A运营商的网络可以用PLMN1标识，核心网102对应的B运营商的网络可以用PLMN2标识。
结合图2所示，若终端注册在A运营商的网络，在A运营商网络出现网络异常时，终端首先搜索A运营商所有制式的网络。例如，终端首先搜索A运营商4G网络，在A运营商4G网络无服务后，继续搜索A运营商3G网络，在A运营商3G网络无服务后，继续搜索2G网络。当终端搜索A运营商所有制式的网络发现全部无服务后，开始搜索其他运营商网络，这些其他网络可能不是全部都与A运营商网络存在协议关系，也就是不是全部允许终端注册，直至搜索到允许注册的B运营商的网络，然后注册到B运营商的某一制式的网络。
本申请的申请是通过分析发现，对于同一运营商的不同制式的网络，提供的服务一般是不同的，通常，运营商的一种制式的网络受损，其他制式的网络其实也会受到影响，业务也会存在问题，所以一般终端在选择其他制式的网络进行注册时，一般不会注册成功，即使注册成功，服务质量也会下降，影响用户体验。
本申请实施例提供了一种网络切换方法及终端。若终端30在网络运营商A的网络的核心网101注册，当核心网101出现故障，使得接入网20与核心网101之间无法进行正常通信时，接入网20向终端30发送***消息1，该***消息1携带PLMN列表以及PLMN1对应的网络不可用的指示(即，指示PLMN1对应的网络的核心网101无服务)。终端30根据***消息1确定当前注册的PLMN1对应的网络不可用时，根据PLMN列表，选择一个可用的PLMN(例如，PLMN2对应的网络)进行注册。通过本申请实施例，当前网络不可用时，根据PLMN列表选择PLMN并进行注册。切换过程中不需要进行本网搜索，切换效率更高。
终端30可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备，以及各种形式的用户设备(User Equipment，UE)，移动台(Mobile station，MS)，终端(terminal)，终端设备(Terminal Equipment)等等。
接入网20包括接入网设备，该接入网设备可以为一种部署在无线接入网中用以为终端提供无线通信功能的装置。该装置可以包括各种形式的宏基站，微基站，中继站，接入点等等。在采用不同的无线接入技术的***中，具备基站功能的设备的名称可能会有所不同，例如在LTE网络中，称为演进的节点B(evolved NodeB，eNB或者eNodeB)，在第三代3G网络中，称为节点B(Node B)等等。为方便描述，本申请中，上述为终端提供无线通信功能的装置统称为接入网设备。
核心网10包括核心网设备，不同的PLMN对应的核心网设备也可以不同，核心网设 备可以为提供用户连接、对用户的管理以及对业务完成承载，作为承载网络提供到外部网络的接口的设备。用户连接的建立包括移动性管理(Mobile Management，MM)、呼叫管理(CM)、交换/路由、录音通知(结合智能网业务完成到智能网***设备的连接关系)等功能。用户管理包括用户的描述、QoS(Quality of Service，服务质量)、用户通信记录(Accounting)、与智能网平台的对话提供虚拟居家环境、安全性(由鉴权中心提供相应的安全性措施包含了对移动业务的安全性管理和对外部网络访问的安全性处理)。承载连接(Access to)包括到外部的PSTN、外部电路数据网和分组数据网、互联网(Internet)和Intranets、以及移动自己的SMS服务器等等。核心网可以提供的基本业务包括移动办公、电子商务、通信、娱乐性业务、旅行和基于位置的服务、遥感业务(Telemetry)简单消息传递业务(监视控制)等等。例如在LTE网络中的MME(Mobility Management Entity，移动管理实体)，SGW(Serving GateWay，服务网关)等等。为方便描述，本申请中，上述提供用户连接、对用户的管理以及对业务完成承载，作为承载网络提供到外部网络的接口的设备统称为核心网设备。
下面结合附图，通过具体的实施例及其应用场景对本发明实施例提供的一种时钟同步的方法及设备进行详细地说明。
图3为本申请实施例提供的一种网络切换方法的信令交互图。如图2所示，该方法具体包括：
S310，网络设备发送***消息。其中，该***消息包括至少两个PLMN的信息，该至少两个PLMN的信息分别包括其对应的PLMN的状态，该至少两个PLMN属于MOCN，该至少两个PLMN中的一个为终端当前注册的PLMN。例如，该***消息包括PLMN列表，该PLMN列表至少包括两个PLMN的信息，该PLMN的信息包括PLMN的标识以及状态等等。该PLMN列表中包括终端当前注册的PLMN信息，该终端当前注册的PLMN信息指示该当前注册的PLMN不可用。
网络设备可以通过SIB1来发送当前小区所属的PLMN列表。SIB1具体可参见3GPP TS 36.331。
PLMN列表中包括PLMN标识(PLMN-Identity，PLMNID)以及小区预留情况(cellReservedForOperatorUse)。当cellReservedForOperatorUse对应的参数为not reserved时，该PLMN可用；当为reserved时，该PLMN不可用。PLMNID由本地SIM卡归属网络的国家码(Mobile Country Code，MCC)和网络码(Mobile Network Code，MNC)组成。其中，所述MCC和MNC一般与所述本地SIM卡的国际移动用户识别码(InternationalMobile SubscriberIdentification Number，IMSI)前缀匹配。
其中，网络设备可以包括接入网设备和核心网设备。接入网设备在确定其与核心网设备无法进行正常通信时，可以将SIB1中该核心网设备对应的PLMN的cellReservedForOperatorUse对应的参数更改为reserved，并向终端发送确认后的SIB1。例如，接入网设备监测到其与核心网设备的S1接口断开，或者接入网设备接收到核心网设备发送的网络不可用的指示时，确定其与核心网设备无法进行正常通信。
终端接收网络设备发送的***消息。具体地，网络设备可向终端发送paging消息，该paging消息用于指示***消息变更。终端在接收到paging消息后，接收SIB1。
S320，终端根据当前注册的PLMN的状态，在确定当前注册的PLMN不可用时，根 据至少两个PLMN的信息，选择至少两个PLMN中除当前注册的PLMN以外且状态为可用的PLMN进行注册。
终端根据***消息中cellReservedForOperatorUse对应的参数，判断当前网络是否可用不可用。
在确定当前PLMN不可用时，不再进行本网络搜索。根据***消息中携带的PLMN列表进行PLMN选择。不再选择rplmn注册，搜索LMN列表中其他可用的PLMN进行注册。注册成功，进入有服务状态。
另外，终端还可以维护黑名单列表，在确定当前PLMN不可用，进行LPMN选择时，匹配黑名单列表，若PLMN在黑名单列表中，则终端不在此PLMN驻留，启动重选PLMN操作，其中，黑名单列表可以根据***消息中的内容确定。
通过本申请实施例，当MOCN组网中，某个运营商网络瘫痪后，优化小区搜索、PLMN选择流程，省去rPLMN LTE(4G)/UMTS(3G)/GSM(2G)所有制式搜索，能够减少60S左右的耗时，快速切换到共享网络中其他可用网络，减少对原有瘫痪网络搜索时间，另外，MOCN网络的背景其实就是为了解决运营商网络覆盖不全的问题，如果多个运营商的网络是属于MOCN的，一般来讲，该多个运营商是有合作关系的，甚至该多个运营商会相互设置对方为EPLMN(对等网络)。多个运营商中某一制式的网络受损，其他制式的网络也会受到影响，业务也会存在问题。所以快速切换到另一运营商的网络，尤其是属于对等网络的运营商的网络，可以提高用户的通信体验。例如，如果A运营商和B运营商是MOCN的，而只要A运营商的任何一网络(4G、3G或者2G)异常，终端可以直接搜B运营商的4G网络(终端一般都是设置4G优先的)，以最快的方式获取正常服务。
图4为一种网络架构图。如图4所示，终端与网络设备中的接入网设备之间通过接入层(AS)协议进行交互。终端与网络设备中的核心网设备通过非接入层(NAS)协议进行交互。其中，接入层协议为非接入层协议的底层协议。
下面结合图4所示的网络架构，对本申请实施例的网络切换方法进行进一步地介绍。
图5为本申请实施例提供的另一种网络切换方法的信令交互图。该方法适用如图3所示的终端。该方法具体包括如下步骤：
501，终端选择PLMN注册过程。
终端在开机后，需要选择PLMN进行注册，该过程可参见3GPP 23122中的相关描述。
例如，结合图6所示，终端的需要，开机后注册PLMN ID为234-34的网络，也就是图6所示的PLMN列表中，602部分指示的PLMN ID对应的网络(例如，图1中所示的核心网101对应的PLMN ID可以为234-34)，其中，234为移动国家码(mobile country code，MCC)，34为移动网络码(mobile network code，MNC)。通过读取***消息1可知，PLMN ID为234-34的网络cellReservedForOperatorUse对应的参数为not reserved，也就是可以进行注册，则终端注册到该网络。其中，SIB1中主要包括广播小区接入与小区选择的相关参数以及SI消息的调度信息等等，该***消息1中包括PLMN列表以及cellReservedForOperatorUse等字段。
502，终端当前PLMN是否可用判断过程。
网络设备在出现故障或其他问题导致无法正常通信后，网络设备需要修改***消息1，并通知终端，一般是将该网络对应的PLMN ID下的cellReservedForOperatorUse字段修 改为reserved。具体地，网络设备首先向终端的接入层发送Paging消息，该消息用于指示***消息1发生变更。终端AS层在接收到Paging消息后，需要重新解析***消息1。
终端AS层解析SIB1，确定当前注册的PLMN1(如图6所示的PLMN ID为234-34的网络)对应的cellReservedForOperatorUse对应的参数为reserved，则确定该PLMN1网络不可用，终端进入无服务状态。
终端AS层携带原因值(即，PLMN1的cellReservedForOperatorUse对应的参数为reserved)，向终端NAS层上报无服务状态。
503，终端PLMN切换过程。
终端NAS层，确定终端在无服务状态后，需执行PLMN切换过程。
具体的，终端NAS层根据解析***消息1得到的PLMN列表，根据该列表进行PLMN选择，例如，如图6所示的***消息1中的PLMN列表包括两个PLMN，PLMN ID为234-34的网络和PLMN ID为234-30(图6所示的601部分指示的PLMN ID)指示的网络(例如，图1中所示的核心网102对应的PLMN ID可以为234-30)。进一步地，终端NAS层在PLMN列表中对应的cellReservedForOperatorUse的参数为not reserved的PLMN中进行选择，例如如图6所示，由于PLMN ID为234-34的网络对应的cellReservedForOperatorUse的参数修改为reserved，故选择则PLMN ID为234-30的网络进行注册。
终端NAS层指示AS层根据其选定的PLMN2(例如，图6所示的PLMN ID为234-30的网络)进行注册。
终端AS层进行小区搜索，在小区搜索成功后，向PLMN2对应的网络设备发起注册请求。在网络设备返回PLMN2注册成功的响应信息后，终端进入有服务状态。
另外，终端AS层还可以维护黑名单列表，在确定当前PLMN不可用，进行LPMN选择时，匹配黑名单列表，若PLMN在黑名单列表中，则终端不在此PLMN驻留，启动重选PLMN操作。
图7为本申请实施例提供的一种终端结构示意图。该终端包括发射器701，接收器702，处理器703以及存储器704。发射器701，接收器702，处理器703以及存储器704可以通过总线(图中为示出)连接。
发射器701用于调生成上行链路信号，该上行链路信号经由天线发射给上述实施例中所述的接入网设备，例如终端向网络设备发送的注册请求等等。接收器702用于调节(例如，滤波、放大、下变频以及数字化等)从天线接收的信号，一般来自网络设备，例如用于接收网络设备发送的Paging消息以及***消息1等等。
处理器703对终端的动作进行控制管理，用于执行上述实施例中由终端进行的处理。例如用于控制终端根据接收***消息和/或本发明所描述的技术的其他过程。具体地，处理器703可以包括AS模块以及NAS模块，AS模块用于解析***消息1，判断当前PLMN是否可用，在当前PLMN不可用时，上报NAS模块。NAS模块用于根据***消息1中的PLMN列表，选择PLMN列表中除当前注册的PLMN以外且状态为可用的PLMN进行注册。作为示例，处理器703用于支持终端执行图3中的过程S310和S320、图5中的过程501、502和503。存储器604用于存储用于终端的程序代码和数据。
可以理解的是，图7仅仅示出了终端的简化设计。例如，在实际应用中，接入网设备可以包含任意数量的发射器，接收器，处理器，控制器，存储器，通信单元等，而所有 可以实现本发明的基站都在本发明的保护范围之内。
用于执行本发明上述终端，接入网设备功能的控制器/处理器可以是中央处理器(CPU)，通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)，现场可编程门阵列(FPGA)或者其他可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。
专业人员应该还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令处理器完成，所述的程序可以存储于计算机可读存储介质中，所述存储介质是非短暂性(英文：non-transitory)介质，例如随机存取存储器，只读存储器，快闪存储器，硬盘，固态硬盘，磁带(英文：magnetic tape)，软盘(英文：floppy disk)，光盘(英文：optical disc)及其任意组合。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。

Claims (10)

  1. 一种网络切换方法，其特征在于，包括：
    终端接收网络设备发送的***消息，所述***消息包括至少两个公共陆地移动网络PLMN的信息，所述至少两个PLMN的信息分别包括其对应的PLMN的状态，所述至少两个PLMN属于多运营商共享网络MOCN，所述至少两个PLMN中的一个为所述终端当前注册的PLMN；
    所述终端根据当前注册的PLMN的状态，在确定所述当前注册的PLMN不可用时，根据所述至少两个PLMN的信息，选择所述至少两个PLMN中除所述当前注册的PLMN以外且状态为可用的PLMN进行注册。
  2. 根据权利要求1所述的方法，其特征在于，所述***消息包括***消息1，所述PLMN的状态包括所述PLMN的标识信息的小区预留情况cellReservedForOperatorUse对应的参数。
  3. 根据权利要求2所述的方法，其特征在于，所述终端根据当前注册的PLMN的状态，在确定所述当前注册的PLMN不可用包括：
    终端确定前注册的PLMN的标识信息的cellReservedForOperatorUse对应的参数为reserved时，确定所述当前注册的PLMN不可用。
  4. 根据权利要求2或3所述的方法，其特征在于，所述状态为可用的PLMN包括，所述至少两个PLMN的标识信息中cellReservedForOperatorUse对应的参数为not reserved的PLMN。
  5. 一种终端，其特征在于，包括：
    接收器，用于接收网络设备发送的***消息，所述***消息包括至少两个公共陆地移动网络PLMN的信息，所述至少两个PLMN的信息分别包括其对应的PLMN的状态，所述至少两个PLMN属于多运营商共享网络MOCN，所述至少两个PLMN中的一个为所述终端当前注册的PLMN；
    处理器，用于根据当前注册的PLMN的状态，在确定所述当前注册的PLMN不可用时，根据所述至少两个PLMN的信息，选择所述至少两个PLMN中除所述当前注册的PLMN以外且状态为可用的PLMN进行注册。
  6. 根据权利要求5所述的终端，其特征在于，所述***消息包括***消息1，所述PLMN的状态包括所述PLMN的标识信息的小区预留情况cellReservedForOperatorUse对应的参数。
  7. 根据权利要求6所述的终端，其特征在于，所述处理器还用于，确定前注册的PLMN的标识信息的cellReservedForOperatorUse对应的参数为reserved时，确定所述当前注册的PLMN不可用。
  8. 根据权利要求6或7所述的终端，其特征在于，所述状态为可用的PLMN包括，所述至少两个PLMN的标识信息中cellReservedForOperatorUse对应的参数为not reserved的PLMN。
  9. 一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行如权利要求1-4任意一项所述的方法。
  10. 一种计算机程序产品，包括指令，当其在计算机上运行时，使得计算机执行如权利要求1-4任意一项所述的方法。
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