WO2015106525A1

WO2015106525A1 - Network selection method and device

Info

Publication number: WO2015106525A1
Application number: PCT/CN2014/079092
Authority: WO
Inventors: 吕亮
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-01-16
Filing date: 2014-06-03
Publication date: 2015-07-23
Also published as: CN104796962A; CN104796962B

Abstract

A network selection method and device. The method comprises: when a user equipment searches for a network, determining whether a registered public land mobile network (RPLMN) of the user equipment can be registered as a long term evolution (LTE) network; if yes, performing LTE network registration through the RPLMN; and if not, searching for an LTE network according to optional network information stored in a preset standby public land mobile network (SPLMN) list, and performing LTE network registration. The SPLMN list is used for storing the optional network information, and the optional network information is information of LTE networks with which the user equipment has registered. Through a combination of the RPLMN and the SPLMN, the user equipment is enabled to access an LTE network with a high priority, the network searching time of the user equipment is shortened, and the efficiency of network searching by the user equipment is improved.

Description

TECHNICAL FIELD The present invention relates to the field of wireless communication technologies, and in particular, to a network selection method and apparatus. BACKGROUND With the development of mobile communication technologies, LTE (Long Term Evolution) technology has been rapidly developed in recent years, and the Global System of Mobile communication (GSM) network will be in the future for a long time. The coexistence of Wideband Code Division Multiple Access (WCDMA) networks and LTE networks will be a normal trend. Therefore, terminals supporting multiple access technologies will also be the development trend of future terminals. There are four types of PLMNs (Public Land Mobile Network) in the Universal Subscriber Identity Module (USIM) card. These four types of PLMN are: an equivalent HPLMN list (referred to as the EHPLMN list). The highest priority PLMN list (referred to as HPLMN list), the operator controlled PLMN list (referred to as OPLIMN list), the user controlled PLMN list (referred to as: UPLMN list). The priority of these four types of PLMNs from high to low is EHPLMN list, HPLMN list, OPLMN list, UPLMN list. According to the TS23.122 of the 3rd Generation Partnership Project (3GPP), the terminal first selects the Registered Public Land Mobile Network (RPLMN) after the power is turned on, and the RPLMN is the terminal. The last successful registration of the network. However, with the popularity of LTE networks, more and more operators have customized the LTE preferences. At this time, the RPLMN network may no longer be the preferred registration network. According to the 3GPP specification TS23.122, if there is no RPLMN or RPLMN is unavailable when the terminal is powered on, the terminal will find an available PLMN according to the priority order of the four types of PLMNs. After finding the PLMN, the terminal will station in this "suitable" cell. stay. For a multimode terminal that supports LTE priority, if you automatically select the network from the LTE to search for the network every time, the network will be searched according to the above PLMN priority order, and there will be a longer network search time. , greatly reducing the user experience. Further, if the network environment in which the user is located does not have the LTE network of the HPLMN, or the network that was successfully registered last time is not the LTE network, the LTE priority registration may fail. This problem is scarce in some radio resource bands, especially in countries with many operators. For example, in order to reduce the construction and maintenance funds of the network, there are often new, merged and demise between operators, which easily causes the operator to have one or more PLMN IDs (Public Land Mobile Network Identity) at the same time. If the PLMN ID of the LTE network of the operator is different from the PLMN ID of the 3G network, the user handles the 3G USIM card of the operator (for example, the USIM card of WCDMA), and under the requirement of LTE priority registration, the user's multimode The terminal open source preferentially searches for the HPLMN parsed by the International Mobile Subscriber Identification Number (IMSI), that is, searches for the HPLMN network of the LTE, registers with the HPLMN network of the 3G, and then registers by reselection or switching. The LTE network causes the problem that the multimode terminal cannot directly register the LTE network. That is to say, in the place where the 3G network as the HPLMN has no coverage, the HPLMN will be searched first. After the HPLMN of LTE cannot be searched for in various access systems, it is possible to search for other PLMNs in the order specified by the protocol. The LTE network of the operator causes LTE registration to be very long and cannot meet the LTE priority requirements. SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a network selection method and apparatus for solving the problem of low efficiency of network selection in the network selection method of the related art. Based on the above technical problems, the present invention is solved by the following technical solutions. In one aspect, the present invention provides a network selection method, including the following steps: determining, when a user equipment searches a network, whether the registered public land mobile network RPLMN of the user equipment can be registered as a long term evolution LTE network; if yes, Performing LTE network registration by using the RPLMN; if not, searching for the LTE network according to the optional network information stored in the SPLMN list of the preset public land mobile network SPLMN, and performing LTE network registration; wherein the SPLMN list is used for storage Optional network information, where the optional network information is information of an LTE network that is registered by the user equipment. Wherein, when the radio access type of the RPLMN is an LTE network, and the public land mobile network PLMN information of the RPLMN is included in the SPLMN list, it is determined that the RPLMN can be registered as an LTE network. Searching for the LTE network according to the optional network information stored in the SPLMN list of the public land mobile network SPLMN, which is set in advance, performing LTE network registration, specifically: according to the priority of each optional network information in the SPLMN list from high to a low order, reading optional network information in the SPLMN list; searching for an LTE network matching the optional network information according to the currently read optional network information; When the LTE network that matches the network information is selected, the user equipment registers according to the LTE network; When the LTE network matching the optional network information is not searched, the optional network information of the next priority in the SPLMN list is continuously read to search for the LTE network until the LTE network registration is completed or the SPLMN is completed. The optional network information in the list is read. The method further includes: after the user terminal performs the LTE network registration, the method further includes: if the PLMN of the LTE network currently accessed by the user equipment exists in the EHPLMN list, and/or, if the user equipment is currently accessing the LTE network The PLMN is the same as the PLMN in the HPLMN list, and/or, if the PLMN of the LTE network currently accessed by the user equipment is equivalent to the PLMN in the HPLMN list, the PLMN information of the LTE network is saved in the SPLMN list. . The saving the PLMN information of the LTE network to the SPLMN list includes: adding PLMN information of the LTE network as the highest priority optional network information to the SPLMN list; and deleting the The lowest priority optional network information in the SPLMN list. In another aspect, the present invention further provides a network selection device, comprising: a determining module, configured to determine, when the user equipment searches the network, whether the registered public land mobile network RPLMN of the user equipment can be registered as a long term evolution LTE network a first registration module, configured to perform LTE network registration by using the RPLMN when the determining module determines to be YES; and a second registration module, configured to: when the determining module determines to be no, according to the foregoing The optional public network mobile network SPLMN list stores optional network information to search for the LTE network, and performs LTE network registration; wherein the SPLMN list is used to store optional network information, where the optional network information is the user Information about the LTE network that the device has registered. Wherein, when the radio access type of the RPLMN is an LTE network, and the public land mobile network PLMN information of the RPLMN is included in the SPLMN list, the determining module determines that the RPLMN can be registered as an LTE network. The second registration module includes: a reading unit, configured to read the optional network information in the SPLMN list according to a priority of each optional network information in the SPLMN list from highest to lowest a search unit, configured to search for an LTE network that matches the optional network information according to the currently read optional network information; and a registration unit, configured to search for a match with the selectable network information In the LTE network, the user equipment is registered based on the LTE network; when the LTE network that matches the optional network information is not searched, the reading unit continues to read the next priority in the SPLMN list. The network information can be selected to search for the LTE network until the LTE network registration is completed or the optional network information in the SPLMN list is read. The apparatus further includes an update module configured to: when the PLMN of the LTE network currently accessed by the user equipment exists in the EHPLMN list, and/or, if the PLMN of the LTE network currently accessed by the user equipment is The PLMNs in the HPLMN list are the same, and/or, if the PLMN of the LTE network currently accessed by the user equipment is equivalent to the PLMN in the HPLMN list, the PLMN information of the LTE network is saved in the SPLMN list. The update module includes: an adding unit, configured to add PLMN information of the LTE network as the highest priority optional network information to the SPLMN list; and a deleting unit, configured to delete the SPLMN list The lowest priority optional network information. The present invention has the following advantages: The present invention utilizes the combination of the RPLMN and the SPLMN of the user equipment to enable the user equipment to access the LTE network with higher priority, thereby improving the efficiency of the user equipment search network. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a general flowchart of a network selection method according to an embodiment of the present invention; FIG. 2 is a flowchart of performing LTE network selection according to a SPLMN list according to an embodiment of the present invention; FIG. 3 is an embodiment of the present invention. A flowchart of an update of the SPLMN list; and FIG. 4 is a block diagram of a network selection device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the problem of low efficiency of network selection in the related art, the present invention provides a network selection method and apparatus. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The present invention implements an LTE priority selection network by maintaining an alternative PLMN list (SUGGESTED PLMN LIST, SPLMN) at the NAS layer (management/non-access layer) of the user equipment (User Equipment, UE). If the user equipment determines that the radio access type (RAT) of the RPLMN is not the LTE network or the RPMMN is registered as the roaming network of the LTE, the optional network information may be selected from the SPLMN list according to a preset rule. registered. After the registration is successful, the SPLMN list can be updated to back up the LTE network that the user equipment registers each time. The SPLMN list is a list of PLMNs maintained by the NAS layer for fast network completion. Can be used to store one or more optional network information in the SPLMN list. The optional network information is user set Prepare information about the LTE network before registration. The optional network information may include: a PLMN ID, a frequency point and a bandwidth corresponding to the PLMN ID. The PLMN ID is the code of the PLMN, for example 46003, 46011. The optional network information in the SPLMN list has a higher priority in the four types of PLMNs. For example: PLMN in the EHPLMN list and PLMN in the HPLMN list can be optional network information in the SPLMN list. The number of optional network information maintained by the SPLMN list can be a fixed value, for example: The number is 5. The one or more optional network information stored in the SPLMN list has a priority, for example, determining the priority according to the chronological order of the optional network information entering the SPLMN list, and finally entering the SPLMN list with the highest priority of the optional network, and entering the SPLMN list at the earliest. The optional network has the lowest priority. The optional network information is related to the USIM used by the user equipment. The user equipments use different USIM cards, which may result in different LTE networks with optional network information. That is, the LTE network with different search priorities is different. For example: Use the USIM card of carrier A to preferentially search for the LTE network of carrier A, and use the carrier. B's USIM card preferentially searches for Carrier B's LTE network. Therefore, the SPLMN list needs to be matched according to the USIM card. Otherwise, the user equipment will be preferentially registered to a roaming LTE network after the USIM card is replaced.

The SPLMN list can be bound to the USIM card of the user equipment and named according to the IMSI of the USIM card of the user equipment. After obtaining the IMSI of the USIM card, the last six digits of the IMSI are used to name the SPLMN list bound to the USIM card. The user equipment uses the SPLMN list to register the LTE network, which serves to quickly register the network and achieve LTE priority. As shown in FIG. 1, FIG. 1 is a general flowchart of a network selection method according to an embodiment of the present invention. Step S110: The user equipment initiates an automatic network searching process. The user equipment can perform automatic network search. The automatic search network refers to the user equipment independently completing the network search and selection according to the rules set in advance. The user equipment may be a mobile phone, an intelligent terminal, a multimedia device, a streaming media device, and the like. When the user equipment is powered on, the configuration information of the user equipment can be read to implement initial configuration of the user equipment. The user equipment can read the pre-configured EHPLMN list and the HPLMN list in the USIM to prepare the user equipment for network selection. The PLMN ID of the highest priority PLMN is stored in the HPLMN list, such as 46011; the PLMN ID of the equivalent HPLMN can be stored in the EHPLMN list, for example, storage 46003 and 46011, this means that the 46003 network is equivalent to the highest priority 46011 network, and the 46003 network and the 46011 network can be considered approximately equal. The user equipment can obtain the IMSI of the user equipment by reading the USIM card, and obtain the SPLMN list bound to the USIM card according to the last six digits of the IMSI of the user equipment. Wherein, when the SPLMN list is obtained for the first time, the SPLMN list is empty. After the user equipment is ready, if the initial configuration is completed, the user equipment starts to search the network to access the network. According to the 3GPP specification TS23.122, the user equipment first reads the RPLMN information and determines whether the network of the RPLMN meets the requirements. Step S120, determining whether the RPLMN satisfies the LTE priority condition. If yes, step S130 is performed, and if not, step S140 is performed. The PLMN information is included in the RPLMN, and the PLMN information may include a PLMN ID, a frequency point corresponding to the PLMN ID, and a bandwidth.

The LTE priority condition is that the radio access type (RAT) of the RPLMN of the user equipment is an LTE network, and the PLMN information of the RPLMN is the same as one of the optional network information in the SPLMN list. It is determined whether the RPLMN satisfies the LTE priority condition, that is, whether the RPLMN of the user equipment can be registered as an LTE network. If the RPLMN satisfies the LTE priority condition, it is determined that the RPLMN can be registered as the LTE network, and the process proceeds to step S130. If the RPLMN does not satisfy the LTE priority condition, the process proceeds to step S140. The radio access type of the RPLMN can be distinguished by the PLMN ID. The NAS layer of the user equipment is used to maintain and control information related to the user equipment accessing the network. The information related to the user equipment accessing the network may include an EHPLMN list, an HPLMN list, a SPLMN list, an RPLMN, and the like. For example, you can maintain information such as RPLMN on the NAS layer and send the RPLMN to the AS layer. The AS layer (access layer) of the user equipment can implement network registration of the user equipment according to the information sent by the NAS layer. For example, if the AS layer receives the RPLMN information from the NAS layer, it can search the network according to the RPLMN information to implement network registration of the user equipment. When the user equipment initiates the automatic network search process, the network of the RPLMN is not necessarily the LTE system, and the user equipment requires the LTE network to be preferentially registered. Therefore, the user equipment cannot directly send the RPLMN information of the NAS layer to the AS layer for searching, but The RPLMN information that was last registered by the user equipment can be utilized. Determining whether the RPLMN of the user equipment meets the LTE priority condition, that is, determining whether the network (RPLMN) that the user equipment last registered is the LTE standard, and determining the PLMN information included in the RPLMN, that is, the frequency of the PLMN ID and the PLMN ID. Whether the bandwidth is included in the SPLMN list. If RPLMN meets LTE priority The condition can be directly used to search the network by RPLMN. If the LTE priority condition is not met, the SPLMN list can be used for network search. Step S130, performing LTE network registration through the RPLMN. When it is determined that the RPLMN of the user equipment satisfies the LTE priority condition, the LTE network registration of the user equipment may be performed according to the cell synchronization and registration procedure of the RPLMN specified in the 3GPP specification TS 23.122. This method has the fastest registration speed, and does not affect the user experience because the search time is too long. This method can ensure that the user equipment does not always register a low priority PLMN or a roaming LTE network. Step S140, performing LTE network selection and registration according to the SPLMN list. When the RPLMN of the user equipment does not meet the LTE priority condition, the LTE network is searched according to the optional network information stored in the SPLMN list, so that the user equipment can preferentially register the LTE network. The optional network information in the SPLMN list belongs to the same type of information as the PLMN information of the RPLMN, but the optional network information in the SPLMN list may not be the last registered PLMN information, and may be the PLMN registered last time or earlier. The information, and the optional network information in the SPLMN list are all LTE standards, however the RPLMN can only remember the last registered PLMN information and the PLMN information does not necessarily include the LTE system. The SPLMN list can be used to store one or more optional network information with priority. When it is determined that the RPLMN of the user equipment does not satisfy the LTE priority condition, the network may be sequentially searched according to the priority of each optional network information stored in the SPLMN list. As shown in FIG. 2, FIG. 2 is a flowchart of performing LTE network selection according to a SPLMN list according to an embodiment of the present invention. Step S210: Read optional network information in the SPLMN list according to the priority of each optional network information in the SPLMN list from highest to lowest. Step S220: Search for an LTE network that matches the optional network information according to the currently read optional network information. Step S230, determining whether an LTE network matching the optional network information is searched for. When the LTE network can be searched according to the currently read optional network information, step S240 is performed. When the LTE network cannot be searched according to the currently read optional network information, the process returns to step S210. Continue to read the next priority optional network information of the currently selectable network information, search for the low priority optional network information The matched LTE network is completed until the LTE network registration is completed or the optional network information in the SPLMN list is read. When the optional network information in the SPLMN list is read and the LTE network has not been searched, the process of performing LTE network selection according to the SPLMN list is ended, and the network search and registration may be performed according to the priority order of the four types of PLMNs. Step S240, when searching for an LTE network that matches the optional network information, the user equipment is based on the

The LTE network is registered. Because the optional network information in the SPLMN list is obtained by recording the previously registered LTE network, the network search using the SPLMN list can provide a reference for the user equipment to quickly search the network and register the network, shortening the user equipment. Web search time. Step S150: After the user terminal registers with the LTE network, the SPLMN list is updated according to a predetermined rule. The predetermined rule includes updating the SPLMN list after the user equipment registers with the LTE network and/or updating the SPLMN list after the completion of the User Equipment Tracking Area Update (TAU). After the user equipment registers with the LTE network or the TAU is completed, the SPLMN list is updated according to the PLMN information of the LTE network registered by the user equipment. The PLMN in the EHPLMN list and the PLMN in the HPLMN list may be members of the SPLMN list. Wherein, if the PLMN of the LTE network currently accessed by the user equipment exists in the EHPLMN list, and/or if the PLMN of the LTE network currently accessed by the user equipment is the same as the PLMN in the HPLMN list, and/or if the user equipment is currently If the PLMN of the LTE network is equal to the PLMN in the HPLMN list, the LTE network that the user equipment accesses is considered to be equal to or higher than the HPLMN priority, and the PLMN information of the LTE network can be used as the PLMN information. The optional network information is saved in the SPLMN list to update the SPLMN list, so that the user equipment can select the network information by referring to the network. The flow of the user terminal updating the SPLMN list is specifically as shown in FIG. 3. FIG. 3 is a flow chart of updating the SPLMN list according to an embodiment of the present invention. Step S310, receiving a signaling message from the network side. The signaling message may include: The entire network system of the user equipment is connected (Evolved Packet System)

(EPS) attach complete) Message, User Equipment Tracking Area Update Complete (TAU complete) message. The EPS attach complete may indicate that the user equipment completes the LTE network registration and has access to the LTE network. The completion of the user equipment TAU may indicate that the user equipment tracking area update is completed. Only after the user equipment completes the LTE network registration, can the TAIL be performed, that is, the user equipment receives the EPS attach complete signaling message sent by the LTE network side before receiving the TAU complete signaling message. For example, after the user equipment accesses the LTE network, the TAU complete signaling message can be generated when the TAIL is performed during the cell handover. Step S320, determining the type of the received signaling message. When the received signaling message is an EPS attach complete message, step S340 is performed. When the received signaling message is a TAU complete message, step S330 is performed. Step S330, determining whether the PLMN of the user equipment changes. If yes, step S340 is performed, and if no, step S380 is performed. The current PLMN information of the user equipment may be included in the user equipment TAU complete signaling message. The PLMN before the user equipment TAU can be compared with the PLMN after the TAU, and it is determined whether the PLMN in the TAU complete signaling message received by the user equipment is the same as the PLMN in the last TAU complete signaling message. That is, it is determined whether the PLMN ID of the PLMN before the TAU and the PLMN ID of the PLMN after the TAU are the same. If the same, the PLMN of the user equipment does not change, and step S380 is performed; if not, the PLMN of the user equipment changes, and the execution is performed. Step S340. Step S340, determining whether the current PLMN of the user equipment belongs to the EHPLMN. If yes, step S370 is performed, and if no, step S350 is performed. According to the description in step S110, the user equipment can read the EHPLMN list in the SIM card when booting up, so as to know the pre-configured equivalent HPLMN list. Before updating the SPLMN list, it is determined whether the current PLMN that the user equipment is successfully registered exists in the EHPLMN list. If it is determined that the current PLMN belongs to the EHPLMN, it is determined that the user equipment selects the high priority PLMN, and the SPLMN list may be updated. It is possible to prevent the PLMN that the user equipment subsequently registers through the SPLMN list from being a low priority PLMN. Further, it may be determined whether the PLMN ID of the current PLMN of the user equipment is the same as the PLMN ID of the PLMN in the EHPLMN list. If they are the same, it indicates that the current PLMN belongs to the EHPLMN. If not, it indicates that the current PLMN does not belong to the EHPLMN. When it is determined that the current PLMN of the user equipment belongs to the EHPLMN, that is, the same PLMN as the current PLMN exists in the EHPLMN list, step S370 is performed, otherwise step SS350 is performed. Step S350, determining whether the current PLMN of the user equipment is an HPLMN. If yes, step S370 is performed, and if no, step S360 is performed. Another method of determining that the PLMN is a high priority PLMN is to determine that the PLMN is an HPLMN. According to the description in step S110, the user equipment can read the HPLMN list in the SIM card when booting up, so as to know the pre-configured HPLMN list. The current PLMN of the user equipment is compared with the PLMN in the HPLMN list. If there is a PLMN that is the same as the current PLMN in the HPLMN list, step S370 is performed, otherwise step S360 is performed. The PLMN ID of the current PLMN may be compared with the PLMN ID of the PLMN in the HPLMN list. If they are the same, the current PLMN is the HPLMN. If they are different, the current PLMN is not the HPLMN. Step S360, determining whether the current PLMN of the user equipment is equivalent to the HPLMN. If yes, step S370 is performed, if otherwise, step S380 is performed. Information of one or more PLMNs that are equivalent to each other may be included in the list of equivalent PLMNs. The equivalent expression is equivalent. For example, if the PHPNA is included in the EHPLMN and the PLMNA is equivalent to the PLMNB, the PLMNA in the EHPLMN can be regarded as the PLMNB. The PLMN ID of the one or more equivalent PLMNs may be included in a list of user equipment, such as an EHPLMN list, an HPLMN list, and the like. After the LTE network is registered, the user equipment may receive the complete EPS attach complete signaling message sent by the LTE network side. After the TAU is completed, the user equipment may receive the TAU complete signaling message sent by the LTE network side. . An equivalent PLMN list message can be configured in the EPS attach complete signaling message and the TAU complete signaling message. The user equipment can store the list of equivalent PLMNs. Further, since the user equipment has stored the equivalent PLMN list delivered by the network side after the registration is completed last time or the last time the TAU is completed, the user equipment may receive the current IPMN after the registration is completed or the TAU is completed. The equivalent PLMN list replaces the last stored equivalent PLMN list. In this way, the network side can inform the user that each PLMN in the list of equivalent PLMNs is mutually equivalent. If the EHPLMN list is not configured in the SIM card, and the current PLMN is not the HPLMN, the SPLMN can only be updated according to the list of equivalent PLMNs sent by the network side. After the user equipment completes the network registration, the network side sends the equivalent PLMN list to the user equipment. If it is determined that the PLMN and the HPLMN registered by the user equipment are equivalent, it is considered that the user equipment is registered as a high priority network. When the current PLMN of the user equipment is equivalent to the HPLMN, step S370 is performed, otherwise step S380 is performed. Step S370, updating the SPLMN list. The information of the current PLMN is added to the highest priority location in the SPLMN list, and the information of the PLMN of the lowest priority location is deleted. According to the 3GPP specification TS23.122, the most recently registered cell of the user equipment has the highest PLMN priority, so the SPLMN list is updated in such a way that the PLMN information to be added is placed at the highest priority position each time the update is performed.

The number of optional network information in the SPLMN list is fixed. The PLLM information of the LTE network accessed by the user equipment may be used as optional network information to update the SPLMN list. Specifically, the PLMN information of the LTE network may be added to the SPLMN list as the highest priority optional network information, and the lowest priority optional network information in the SPLMN list may be deleted. To ensure that the number of optional network information in the SPLMN list does not change. For example: The optional network information A, B, and C are included in the SPLMN list, and the priority of the optional network information is sequentially decreased from A to C. When it is necessary to add D as optional network information to the SPLMN list, D can be used as the highest priority optional network information, and the lowest priority C is deleted, and an updated SPLMN list is obtained, and the updated SPLMN list can be The network information is selected as D, A, and B, and the priority of the optional network information is sequentially decreased from D to B. In step S380, the SPLMN list is not updated. The PLMN of the LTE network currently accessed by the user equipment does not exist in the EHPLMN list, the PLMN of the LTE network currently accessed by the user equipment is different from the PLMN in the HPLMN list, and the PLMN and HPLMN lists of the LTE network currently accessed by the user equipment are If the PLMN is not equivalent, it can be considered that the user equipment is currently registered with a low priority LTE network or a roaming network. At this time, the SPLMN list is not updated. According to the above method, the present invention also provides a network selection device. As shown in FIG. 4, FIG. 4 is a structural diagram of a network selection device 400 according to an embodiment of the present invention. The apparatus 400 may include: a determining module 410, configured to determine, when the user equipment searches the network, whether the registered public land mobile network RPLMN of the user equipment can be registered as a long term evolution LTE network. When the radio access type of the RPLMN is an LTE network, and the public land mobile network PLMN information of the RPLMN is included in the SPLMN list, the determining module 410 determines that the RPLMN can be registered as the LTE network. The first registration module 420 is configured to perform LTE network registration by using the RPLMN when the determination module 410 determines that the YES is determined by the RMMMN; and the second registration module 430 is configured to be configured according to the preset when the determination module 410 determines to be NO. The optional network information stored in the SPLMN list of the public land mobile network is searched for the LTE network, and the LTE network is registered. The SPLMN list is used to store the optional network information, and the optional network information is the information of the LTE network registered by the user equipment. The second registration module 430 may include: a reading unit 431 configured to read the optional network information in the SPLMN list in descending order of priority of each of the selectable network information in the SPLMN list; the searching unit 432, setting To search for an LTE network that matches the optional network information according to the currently read optional network information; the registration unit 433 is configured to: when searching for an LTE network that matches the optional network information, the user equipment is based on the LTE network When the LTE network that matches the optional network information is not searched, the reading unit continues to read the optional network information of the next priority in the SPLMN list to search for the LTE network until the LTE network registration is completed or SPLMN The optional network information in the list is read. The apparatus 400 can also include an update module 440 that can be configured to include updating the SPLMN list after the user terminal preferentially registers the optional network. The update module 440 is configured to: when the PLMN of the LTE network currently accessed by the user equipment exists in the EHPLMN list, and/or if the PLMN of the LTE network currently accessed by the user equipment is the same as the PLMN in the HPLMN list, and/or If the PLMN of the LTE network currently accessed by the user equipment is equivalent to the PLMN in the HPLMN list, the PLMN information of the LTE network is saved in the SPLMN list. The update module 440 may include: an adding unit 441, which may be configured to add PLMN information of the LTE network as the highest priority optional network information to the SPLMN list; and a deleting unit 442, which may be set to delete the lowest priority in the SPLMN list. Level of optional network information. The function of the device in this embodiment is basically corresponding to the method embodiment shown in FIG. 1 to FIG. 3, and therefore, in the description of the embodiment, reference may be made to the related description in the foregoing embodiment. Do not repeat them. While the preferred embodiments of the present invention have been disclosed for purposes of illustration, those skilled in the art will recognize that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above. Industrial Applicability As described above, a network selection method and apparatus provided by the embodiments of the present invention have the following beneficial effects: The user equipment is connected to the LTE with higher priority by combining the RPLMN and the SPLMN of the user equipment. The network improves the efficiency of user equipment search.

Claims

The claim request method and a network selection method include: determining, when the user equipment searches the network, the registered public land mobile network of the user equipment

Whether the RPLMN can be registered as a Long Term Evolution (LTE) network; if yes, the LTE network registration is performed through the RPLMN; if not, the LTE network is searched according to the optional network information stored in the SPLMN list of the preset public land mobile network preset. Performing an LTE network registration; wherein the SPLMN list is used to store optional network information, where the optional network information is information of an LTE network that is registered by the user equipment. The method of claim 1, wherein

When the radio access type of the RPLMN is an LTE network, and the public land mobile network PLMN information of the RPLMN is included in the SPLMN list, it is determined that the RPLMN can be registered as an LTE network. The method of claim 1 or 2, wherein searching for the LTE network according to the optional network information stored in the SPLMN list, and performing the LTE network registration, specifically:

Reading the optional network information in the SPLMN list according to the order of priority of each optional network information in the SPLMN list; searching and speaking according to the currently read optional network information Optional network information matching LTE network; when searching for an LTE network that matches the optional network information, the user equipment registers based on the LTE network; when not searching for the optional network information When the LTE network is matched, the optional network information of the next priority in the SPLMN list is continuously read to search for the LTE network until the LTE network registration is completed or the optional network information in the SPLMN list is read. The method of claim 1, further comprising: after the user terminal performs the LTE network registration, the method further includes:

If the PLMN of the LTE network currently accessed by the user equipment exists in the EHPLMN list, and/or, if the user equipment is currently accessing the PLMN of the LTE network and the PLMN in the HPLMN list The same, and/or, if the PLMN of the LTE network currently accessed by the user equipment is equivalent to the PLMN in the HPLMN list, the PLMN information of the LTE network is saved in the SPLMN list. The method of claim 4, wherein the saving the PLMN information of the LTE network to the SPLMN list comprises: adding PLMN information of the LTE network as the highest priority optional network information Up to the SPLMN list; and deleting the lowest priority optional network information in the SPLMN list. And a network selection device, comprising: a determining module, configured to determine, when the user equipment searches the network, whether the registered public land mobile network RPLMN of the user equipment can be registered as a long term evolution LTE network; the first registration module is set to When the determining module determines to be YES, the LTE network registration is performed by using the RPLMN; and the second registration module is configured to: according to the preset public land mobile, if the determining module determines to be no The optional network information stored in the network SPLMN list searches for the LTE network, and performs LTE network registration. The SPLMN list is used to store the optional network information, where the optional network information is information about the LTE network that is registered by the user equipment. . The apparatus according to claim 6, wherein: when the radio access type of the RPLMN is an LTE network, and the public land mobile network PLMN information of the RPLMN is included in the SPLMN list, the determining module determines that The RPLMN can be registered as an LTE network. The device of claim 6 or 7, wherein the second registration module comprises:

a reading unit, configured to read optional network information in the SPLMN list according to a priority of each optional network information in the SPLMN list, and a search unit, configured to be based on the current read The optional network information is used to search for an LTE network that matches the optional network information;

a registration unit, configured to: when searching for an LTE network that matches the optional network information, the user equipment registers according to the LTE network; when an LTE network that matches the optional network information is not searched , the reading unit continues to read the optional of the next priority in the SPLMN list The network information is used to search for the LTE network until the LTE network registration is completed or the optional network information in the SPLMN list is read. The device according to claim 6, wherein the device further comprises: an update module, configured to: when the PLMN of the LTE network currently accessed by the user equipment exists in the EHPLMN list, and/or, if the user equipment is currently connected The PLMN of the LTE network is the same as the PLMN in the HPLMN list, and/or, if the PLMN of the LTE network currently accessed by the user equipment is equivalent to the PLMN in the HPLMN list, the PLMN information of the LTE network is saved to the In the SPLMN list. The device of claim 9, wherein the updating module comprises: an adding unit, configured to add PLMN information of the LTE network as the highest priority optional network information to the SPLMN list;

The delete unit is set to delete the lowest priority optional network information in the SPLMN list.