CN115604695A

CN115604695A - Method and device for determining priority of public land network (PLMN)

Info

Publication number: CN115604695A
Application number: CN202211205635.6A
Authority: CN
Inventors: 尹建树
Original assignee: Zeku Technology Beijing Corp Ltd
Current assignee: Zeku Technology Beijing Corp Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-01-13

Abstract

The embodiment of the application discloses a method, a device, user equipment and a storage medium for determining the priority of a public land network (PLMN), wherein the method comprises the following steps: obtaining a public land network (PLMN) search result; and under the condition that the first PLMN is included in the PLMN search result and exists in a PLMN list which is suspended and registered due to roaming guide SOR, determining that the first PLMN is the PLMN with the lowest priority, wherein the first PLMN is the user-controlled PLMN including the access technology. By implementing the embodiment of the application, the user-controlled PLMN containing the access technology in the PLMN list which is registered due to the interruption of the SOR can be prevented from being selected, so that the stability of a communication system is improved.

Description

Method and device for determining priority of public land network (PLMN)

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a priority of a PLMN (Public Land Mobile Network).

Background

Roaming enables a User Equipment (UE) to connect with a network to transmit and receive data even when the UE is outside a service area, and roaming Steering (SOR) is a technique used by the UE during roaming to select a Public Land Mobile Network (PLMN).

As an example, if a Universal Subscriber Identity Module (USIM) card configuration of the UE indicates that the SOR information should be received when the UE initiates an initial registration on a visited public land network (VPLMN) that includes an access technology. If the VPLMN does not provide SOR information or the security check of the SOR information received from the VPLMN fails, the UE needs to add the VPLMN to the PLMN list for registration suspension by SOR.

There is a case where, when selecting a PLMN, the UE selects a PLMN included in the PLMN list whose registration is suspended by the SOR, and the PLMN in the PLMN list whose registration is suspended by the SOR may be a PLMN with a network abnormality, so that even if a PLMN with the highest priority in the PLMN search result is selected, the UE may perform a process of selecting a network multiple times due to a network problem, which may cause instability of a communication system and affect user use.

Disclosure of Invention

The embodiment of the application discloses a method and a device for determining the priority of a PLMN (public land Mobile network), which can be used for determining the priority of the searched PLMN in a PLMN searching scene, can avoid selecting a PLMN which is controlled by a user and contains an access technology in a PLMN list and is registered due to an SOR (service object register) suspension, and improve the stability of a communication system.

The embodiment of the application provides a method for determining the priority of a PLMN, which comprises the following steps:

obtaining a public land network (PLMN) search result;

and under the condition that the first PLMN is included in the PLMN search result and exists in a PLMN list which is registered in a suspended mode due to roaming guide SOR, determining that the first PLMN is the PLMN with the lowest priority, wherein the first PLMN is the PLMN which is controlled by a user and comprises an access technology.

The embodiment of the present application further provides an apparatus for determining a priority of a PLMN, including:

a communication unit, configured to obtain a public land network PLMN search result;

and the processing unit is configured to determine that the first PLMN is a lowest priority PLMN when the PLMN search result includes the first PLMN and the first PLMN exists in a PLMN list for which registration is suspended by a roaming guidance SOR, where the first PLMN is a user-controlled PLMN including an access technology.

The embodiment of the application discloses user equipment, which comprises a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to implement the method for determining the priority of any terrestrial public network disclosed in the embodiment of the application when executing the computer program.

The embodiment of the application discloses a computer readable storage medium, on which a computer program is stored, wherein the computer program is executed by a processor to realize the priority determination method of any one of the land public networks disclosed in the embodiment of the application.

Compared with the related art, the embodiment of the application has the following beneficial effects:

according to the embodiment of the application, after the PLMN search result is obtained, the user equipment regards the first PLMN which exists in the PLMN search result and the PLMN list which is registered due to the registration interruption of the SOR at the same time as the PLMN with the lowest priority, so that the user-controlled PLMN which contains the access technology and is selected from the PLMN list which is registered due to the registration interruption of the SOR can be avoided, the unification of the priorities of the same PLMN in different scenes is realized, and the stability of a communication system is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1A is an architecture diagram of an example of a communication system provided by an embodiment of the present application;

fig. 1B is an architecture diagram of another example of a communication system provided by an embodiment of the present application;

fig. 2 is a schematic structural diagram of an example of a user equipment provided in an embodiment of the present application;

fig. 3 is a flow chart of an example of performing an SOR flow during a PLMN handover;

fig. 4 is a method flowchart of an example of a method for determining a priority of a public land network PLMN disclosed in an embodiment of the present application;

fig. 5 is a flowchart of another example of a method for determining a priority of a PLMN according to an embodiment of the present application;

fig. 6 is a flowchart of another example of a method for determining a priority of a PLMN according to an embodiment of the present application;

FIG. 7 is a flowchart illustrating a first application of an embodiment of the present application;

FIG. 8 is a flowchart illustrating a second application of the embodiment of the present application;

FIG. 9 is a flowchart illustrating an application example three according to an embodiment of the present application

Fig. 10 is a block diagram of an example structure of a device for determining priority of a public land network according to an embodiment of the present application;

fig. 11 is a block diagram of another example structure of a priority determination apparatus for a public land network according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

For the convenience of clearly describing the technical solutions of the embodiments of the present application, the technical terms related to the embodiments of the present application are explained below.

1) PLMN: refers to a network established and operated by a government or an approved operator thereof for the purpose of providing land mobile communication services to the public.

2) Home Public Land Mobile Network (HPLMN): the PLMN to which the ue belongs is determined by an International Mobile Subscriber Identity (IMSI) on the USIM card of the ue. There is only one HPLMN for a certain user equipment.

3) Equivalent Home Public Land Mobile Network (EHPLMN): is a PLMN that is co-located with the home PLMN currently selected by the user equipment. The operator corresponding to the HPLMN may have different PLMNs, for example, the operator 1 has three PLMNs, PLMN1, PLMN2, and PLMN3, and PLMNs 2 and 3 are EHPLMNs as opposed to PLMN1, and the information may be written in the SIM card before the SIM card leaves the factory.

4) Equivalent PLMN (EPLMN): the PLMN which is in the same position as the currently selected PLMN of the user equipment is referred to, it is understood that the PLMN which is currently selected by the user equipment and the PLMN which is in the same position as the currently selected PLMN can be freely reselected, and the EPLMN network can be configured by an operator.

5) User controlled public land mobile network (UPLUMN) including access technology: is a parameter related to PLMN selection.

6) Operator controlled public land mobile network (OPLMN) containing access technology: is another parameter related to PLMN selection.

7) The Registered Public Land Mobile Network (RPLMN) refers to a PLMN which is successfully registered and initiated by the user equipment to the core network last time or last time, for example, the PLMN which is successfully registered and initiated last time before the user equipment is disconnected from the network.

8) In the embodiments of the present application, the words "first", "second", and the like are used to distinguish the same items or similar items having substantially the same functions and actions. For example, the first instruction and the second instruction are for distinguishing different user instructions, and the order of the first instruction and the second instruction is not limited. Those skilled in the art will appreciate that the terms "first," "second," and the like do not denote any order or importance, but rather the terms "first," "second," and the like do not denote any order or importance.

It is noted that the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "such as" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

9) "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, and c may represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, wherein a, b and c can be single or multiple.

To facilitate understanding of the technical solutions of the embodiments of the present application, an application scenario of the present application is first described.

Fig. 1A is a block diagram of an exemplary communication system according to an embodiment of the present disclosure. As shown in fig. 1A, the communication system includes a UE101, a network device 102, and at least 2 PLMN networks, for example, there are 2 PLMN networks, PLMN1 and PLMN2, respectively, and PLMN1 and PLMN2 are accessed through the network device 102. The PLMN1 and PLMN2 may be UPLMN or OPLMN, or, if there are other types of PLMNs, the PLMN1 and PLMN2 may also be other types of PLMNs, and the types of PLMNs are not limited herein.

It should be noted that, in fig. 1A, taking the example that the communication system includes 1 user equipment, 1 network device 102, and 2 PLMN networks, in the actual use process, the number of the user equipment, the network device, and the PLMN networks is not limited. For example, please refer to fig. 1B, which is a block diagram illustrating another exemplary communication system according to an embodiment of the present disclosure. As shown in fig. 1B, the communication system includes 1 user equipment, 2 network devices, and 3 PLMN networks, where the user equipment is user equipment 102, the 2 network devices are network device 103 and network device 104, respectively, and the 3 PLMN networks are PLMN3 to PLMN5, respectively, where PLMN3 is accessed through network device 103, and PLMN4 and PLMN5 are accessed through network device 104.

It should be understood that the network device may be any device having a wireless transceiving function. Such devices include, but are not limited to: an evolved node B (eNB or eNodeB), a Radio Network Controller (RNC), a node B (NodeB, NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., homeevevdnodeb or homeNodeB, HNB), a baseband unit (BBU), an Access Point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a Transmission Point (TP) or a Transmission Reception Point (TRP), etc., may also be a gbb or a transmission point (TRP or TP) in a 5G communication system or an NR system, or a group of base stations (including multiple antennas) may also constitute a network panel or a radio transmission panel (NB), or a BBU may also constitute a network panel or a distributed transmission panel (BBU), such as a BBU or a baseband unit. In some deployments, the gNB may include a Centralized Unit (CU) and a DU. The gNB may also include a Radio Unit (RU). The CU implements part of the function of the gNB, and the DU implements part of the function of the gNB, for example, the CU implements the function of a Radio Resource Control (RRC) layer, a packet data convergence layer protocol (PDCP) layer, and the DU implements the function of a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as the RRC layer signaling, may also be considered to be transmitted by the DU or the DU + CU under this architecture. It is to be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into network devices in an access network (RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

It should also be understood that user equipment, which may also be referred to as terminal equipment, access terminals, subscriber units, subscriber stations, mobile stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user devices. The terminal may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like.

The communication system may be a 5G communication system, an LTE communication system, or other future-oriented communication systems, and is not limited herein. The communication system may further include other devices, such as a relay device, a routing device, etc., which are not shown in the communication systems shown in fig. 1A and 1B, but those skilled in the art may set the devices according to actual use situations, and the present invention is not limited thereto.

The foregoing describes a communication system in an embodiment of the present application, and the structure of a user equipment in the communication system is further described below.

Please refer to fig. 2, which is a schematic structural diagram of an example of a ue according to an embodiment of the present disclosure. The user device as shown in fig. 2 comprises components such as a processor 210, a memory 220, a transceiver 230, a display unit 240, an input unit 250, a sensor 260, an audio circuit 270, and a power module 280.

The processor 210 is a control center of the user equipment, connects various parts of the entire user equipment using various interfaces and lines, performs various functions of the user equipment and processes data by running or executing software programs and/or modules stored in the memory 220 and calling data stored in the memory 220, thereby performing overall monitoring of the user equipment. Alternatively, processor 210 may include one or more processing units; optionally, the processor 210 may be integrated with an application processor, and the application processor mainly processes an operating device, a user interface, an application program, and the like, and may also include other processors, which are not listed here.

The memory 220 may be used to store software programs and modules, and the processor 210 executes various functional applications and data processing of the user equipment by operating the software programs and modules stored in the memory 220. The memory 220 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating device, an application program required for at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the user equipment, etc. Further, the memory 220 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The transceiver 230 may provide a solution for wireless communication applied to the user equipment, including Wireless Local Area Networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), bluetooth (BT), global Navigation Satellite System (GNSS), frequency Modulation (FM), near Field Communication (NFC), infrared (IR), and the like. Transceiver 230 may be one or more devices that integrate at least one communication processing module, such as, without limitation, transceiver 230 integrating an antenna with a baseband processor, or transceiver 230 integrating an antenna with a modem processor, etc.

The display unit 240 may be used to display information input by a user or information provided to the user and various menus of the user equipment. The Display unit 240 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), and the like, without limitation.

The input unit 250 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the user device. Specifically, the input unit 250 may collect operations by a user thereon or nearby and drive the corresponding connection device according to a preset program. In addition, the input unit 250 may include a touch panel 251, and the touch panel 251 may be implemented in various types, such as resistive, capacitive, infrared, and surface acoustic wave. The input unit 250 may include other input devices 252 in addition to the touch panel 251. In particular, the other input devices 252 may include, but are not limited to, one or more of function keys (such as volume control keys, switch keys, etc.), a trackball, a joystick, and the like.

The user device may also include at least one sensor 260, such as a gyroscope sensor, a motion sensor, and other sensors. The motion sensor can comprise an acceleration sensor, is used for detecting the magnitude of acceleration in each direction, can detect the magnitude and the direction of gravity when the motion sensor is static, and can be used for identifying the application of the posture of the electronic equipment, such as horizontal and vertical screen switching, related games, magnetometer posture calibration and the like; other sensors such as a pressure gauge, a barometer, a hygrometer, a thermometer, and an infrared sensor, which are also configurable by the electronic device, are not described herein.

Audio circuitry 270 may include a speaker 271 and microphone 272 that may provide an audio interface between a user and a user device. The audio circuit 270 may transmit the electrical signal converted from the received audio data to the speaker 271, and convert the electrical signal into a sound signal by the speaker 271 for output; on the other hand, the microphone 272 converts the collected sound signal into an electrical signal, which is received by the audio circuit 270 and converted into audio data, which is then processed by the audio data output processor 210, and then sent to another electronic device via the video circuit, for example, or the audio data is output to the memory 220 for further processing.

The user equipment further includes a power module 280 for supplying power to each component, and optionally, the power module 280 may be logically connected to the processor 210 through a power management device, so that the power management device may manage charging, discharging, power consumption management, and the like.

Although not shown, the user device may also include a camera. Optionally, the position of the camera on the user equipment may be front-located or rear-located, which is not limited in this embodiment of the present application.

It is to be understood that the illustrated structure in the embodiments of the present application does not constitute a specific limitation to the user equipment. In other embodiments of the present application, the user equipment may include more or fewer components than illustrated, or combine certain components, or split certain components, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

In the communication system, the roaming technology is used to realize that the user equipment can also perform data transmission during the moving process, so that an SOR flow is provided to facilitate the user equipment to perform PLMN handover more quickly.

Next, the content of performing the SOR procedure during the PLMN handover will be described by taking fig. 1A as an example. Referring to fig. 3, a flowchart of another example of performing an SOR procedure during PLMN handover is described as follows:

step S310, the user equipment 101 is in an automatic network selection mode and resides on UPLMN 1;

for convenience of illustration, in the example shown in fig. 3, taking a PLMN with PLMN1 being a UPLMN type and having a first priority as an example, PLMN1 may be represented by UPLMN1.

Step S302, the user equipment 101 sends a registration request for registering PLMN1 to the access network equipment 102, and the access network equipment 102 receives the registration request.

Step S303, the access network device 102 sends a registration acceptance message to the user equipment 101, and the user equipment 101 receives the registration acceptance message.

Step S304, the user equipment 101 determines that the registration accept message does not include the SOR information, or the SOR information is parsed from the registration accept message but the security check of the SOR information fails.

Step S305, the user equipment 101 adds PLMN1 to the PLMN list (which is called PLMNs wireless registration works associated to SOR in english) whose registration is suspended by SOR.

Step S306, the user equipment 101 still resides in the PLMN1, and enters an idle state.

Step S307, when the high priority timer of the user equipment 101 times out, triggering the high priority network selection, and the user equipment 101 searches for the PLMN.

Step S308, the user equipment 101 obtains a PLMN search result.

As an example, the PLMN search result includes: PLMN1 and PLMN2, wherein the PLMN type of PLMN1 has a higher priority than the PLMN type of PLMN2, for example, PLMN1 is UPLMN and PLMN2 is OPLMN. Illustratively, the priority of the PLMN type is according to the priority order specified in protocol 23.122: and sequencing the PLMNs according to the sequence of HPLMN/EHPLMN, UPLMN, OPLMN, high signal quality PLMN and non-high signal quality PLMN.

Step S309, the user equipment 101 determines the PLMN with the highest priority among the resident PLMNs and the PLMN search results.

As an example, the user equipment 101 may obtain its stored EPLMN list, for example, the EPLMN list includes PLMN1 and PLMN3, and the priority order of PLMN1 to PLMN3 is: PLMN1> PLMN2> PLMN3. Since in the example shown in fig. 3, PLMN search is triggered due to timeout of the high priority timer, the PLMN list whose registration is suspended due to SOR is not considered when filtering the UPLMN in this scenario, and thus, the priority of PLMN1 does not change. Thereby obtaining the PLMN with the highest current priority as PLMN1.

Step S310, the user equipment 101 resides on the PLMN with the highest priority.

In this example, since PLMN1 has the highest priority, user equipment 101 remains camped on PLMN1.

The above scenarios are only for illustration, and in the actual use process, other scenarios may also be included, for example, selecting a PLMN in a high priority timer timeout scenario, which is not described herein.

As can be seen from fig. 3, when a PLMN is selected by a UE, a PLMN including an access technology controlled by a user and included in a PLMN list in which registration is suspended by an SOR may be selected by the UE, and a PLMN in which network abnormality occurs may be a PLMN in which registration is suspended by the SOR, so that even if a PLMN with the highest priority in a PLMN search result is selected, a process of selecting a network by the UE multiple times due to a network problem may occur, which may cause instability of a communication system and affect user use.

In view of this, the embodiments of the present application provide a method for optimizing a public land network, in which a UPLMN whose registration is suspended due to an SOR is regarded as a PLMN with a lowest priority in a PLMN search result, so that priority processing on the PLMN whose registration is suspended due to the SOR is unified under different scenarios, network selection to a PLMN including an access technology controlled by a user in a PLMN list whose registration is suspended due to the SOR can be avoided, and stability of a communication system is improved.

Hereinafter, the technical solutions in the embodiments of the present application will be described in detail with reference to the accompanying drawings.

Please refer to fig. 4, which is a flowchart illustrating an exemplary method for determining a priority of a public land network PLMN according to an embodiment of the present application. The method may be applied to a communication system shown in fig. 1A or fig. 1B, for example, the UE in the following may be a user equipment 101 in the communication system shown in fig. 1A or fig. 1B, and the network device in the following may be any one of a network device 102 to a network device 104 in the communication system shown in fig. 1A or fig. 1B, and the description of the flowchart of the method is as follows:

step S410, the UE obtains a PLMN search result.

Illustratively, the PLMN search result may include at least one searched PLMN. Specifically, the PLMN search result may include at least one PLMN included in the user-controlled PLMN selector list including access technologies, and/or at least one PLMN included in the operator-controlled PLMN selector list including access technologies.

In practical applications, the non-access stratum of the UE may instruct the access stratum to perform PLMN search. And after obtaining the PLMN search result, the access layer reports the PLMN search result to the non-access layer, so that the non-access layer performs PLMN selection based on the PLMN search result.

In this embodiment of the present application, the PLMN search result may be a search result obtained by performing PLMN search by the UE in any scenario. For example, the PLMN search results may include search results of a PLMN search triggered by a timeout of a high priority timer, or search results of a PLMN search attempting to restore service in a UE offline state.

In some embodiments, the UE obtaining the PLMN search result may include: and acquiring the PLMN searching result under the condition that a high priority timer is overtime, wherein the high priority timer is used for periodically triggering PLMN selection.

Specifically, when the UE is camped on the VPLMN, a high priority timer may be started, and in case the high priority timer expires, the UE may obtain a PLMN search result, and camp on the HPLMN or other higher priority PLMN based on the PLMN search result. Periodic retrieval of PLMN search results may be accomplished using timer start/reset to periodically attempt the HPLMN or higher priority PLMNs.

In other embodiments, the obtaining, by the UE, the PLMN search result may include: and the UE is in a offline state, the PLMN list which is stopped to be registered due to the SOR comprises the registered PLMN, and the PLMN searching result is obtained.

Specifically, when the UE is offline while camped on the VPLMN, if the registered PLMN (i.e., the VPLMN) is not included in the PLMN list for registration suspension by SOR, the UE preferentially attempts to camp on the VPLMN again. If the PLMN list in which registration is stopped by the SOR includes the registered PLMN, the UE does not preferentially try to register the PLMN, but starts PLMN search, acquires a PLMN search result, and determines to reselect the PLMN according to the PLMN search result.

Step S420, when the PLMN search result includes the first PLMN and the first PLMN exists in the PLMN list for which registration is suspended due to SOR, determining that the first PLMN is the PLMN with the lowest priority, where the first PLMN is a user-controlled PLMN including an access technology.

That is, if the UPLMN exists in both the PLMN list for which registration was suspended by the SOR and the PLMN search result, the priority of the UPLMN may be determined to be the lowest priority. Or, in the PLMN search result, the priority of the UPLMN existing in the PLMN list for which registration was suspended by the SOR is regarded as the lowest priority.

Optionally, when the PLMN search result includes other PLMNs, for example, a second PLMN, and the second PLMN exists in the PLMN list for which registration is suspended by the SOR, the UE may also determine that the second PLMN is the lowest priority PLMN, and the second PLMN is a user-controlled PLMN including an access technology.

That is, all PLMNs existing in the PLMN list for which registration was suspended by SOR, whether UPLMN or OPLMN, are collectively regarded as the lowest priority.

It should be noted that the UPLMN and the OPLMN in the embodiment of the present application are generally referred to, that is, the UPLMN may be understood as all PLMNs belonging to the UPLMN type, and the OPLMN may be understood as all PLMNs belonging to the OPLMN type.

Illustratively, the list of PLMNs registered due to SOR termination includes at least one PLMN registered due to SOR termination. The registration suspension by the SOR may include that the UE does not acquire SOR information or security check of the SOR information fails in the process of registering the VPLMN.

Optionally, the PLMN list for registration suspension due to SOR includes the visited PLMN including the access technology, i.e. VPLMN. Specifically, when the UE is configured to receive SOR information when initiating initial registration on a VPLMN, for example, when a USIM card of the UE is configured with Service n ° 127, it may be considered that an abnormal condition occurs in the VPLMN because the security check of the SOR information or SOR information sent by a network device of the VPLMN is not received in an actual registration process, and therefore, the VPLMN is added to a PLMN list for which registration is terminated by SOR, so that the list includes at least one PLMN for which registration is terminated by SOR, and the list may be applied in a PLMN search scenario to determine a priority of a searched PLMN.

Optionally, the PLMN list for registration suspension due to SOR may include a PLMN including an access technology controlled by a user and/or a PLMN including an access technology controlled by an operator, and of course, if the VPLMN further includes other types of PLMNs besides the two types of PLMNs, the PLMN list for registration suspension due to SOR may also include the other types of PLMNs. It can be understood that, according to the method of the embodiment of the present application, in the case that the PLMN exists in the PLMN search result, the PLMN is considered as the PLMN with the lowest priority. That is, whether it is the UPLMN or the OPLMN, its priority is considered the lowest priority.

According to the method of the embodiment of the application, after the PLMN search result is obtained, the UE regards the UPLMN which is simultaneously present in the PLMN search result and the PLMN list whose registration has been suspended due to SOR as the PLMN of the lowest priority. That is to say, the network selection is prevented from reaching the user-controlled PLMN including the access technology in the PLMN list in which registration is suspended due to SOR, and different priority processing modes are not used for the PLMN in which registration is suspended due to SOR due to different UE network selection modes or different scenarios, so that the priorities of the same PLMN in different scenarios are unified, and the stability of the communication system is improved.

In the following, the method for determining the priority of the PLMN provided in the embodiment of the present application is further described by taking an example where the method is applied to a process of selecting a PLMN with the highest priority.

Specifically, please refer to fig. 5, which is a flowchart illustrating another exemplary method for determining a priority of a PLMN according to an embodiment of the present application. As shown in fig. 5, the method may include the following steps.

Step S510, the UE obtains a PLMN search result.

Step S520, determining that the first PLMN is the lowest priority PLMN when the PLMN search result includes the first PLMN and the first PLMN exists in the PLMN list for which registration is suspended by the roaming guidance SOR, where the first PLMN is the PLMN controlled by the user and including the access technology.

Steps S510 to S520 are similar to steps 510 to S520, and are not described herein again.

Step S530, according to the PLMN list for which registration is suspended by the SOR, selecting a PLMN with the highest priority in the PLMN search result, where the PLMN in the PLMN list for which registration is suspended by the SOR has the lowest priority.

For example, a part of PLMNs in the PLMN search result may be determined to be the lowest priority based on the list of PLMNs whose registration was suspended due to SOR, the part of PLMNs being PLMNs included in the list of PLMNs whose registration was suspended due to SOR; and sequencing other PLMNs except the part of PLMNs in the PLMN search result based on a preset priority order to obtain the priorities of the other PLMNs, thereby determining the PLMN with the highest priority in the PLMN search result.

Optionally, the preset priority order may include: the priority of the user controlled PLMN including access technology is higher than the priority of the operator controlled PLMN including access technology. For example, when the PLMN search result includes UPLMN1, UPLMN2, and OPLMN1, if UPLMN1 is a PLMN in the PLMN list for which registration is suspended by SOR, UPLMN1 is determined as the lowest priority PLMN, and the priority order is determined to be UPLMN 2> OPLMN 1> UPLMN1 based on the preset priority order.

Illustratively, in a case where a PLMN search result includes a PLMN controlled by a user and including an access technology, and the PLMN suspended registration by the SOR includes the PLMN controlled by the user and including an access technology in the PLMN list, the PLMN with the highest priority is an operator-controlled PLMN including an access technology.

That is, if the UPLMN in the PLMN search result exists in the PLMN list whose registration was suspended due to SOR, the PLMN with the highest priority is not the UPLMN but the OPLMN. In this case, it can be understood that the PLMN search result includes only one PLMN of the UPLMN type included in the PLMN list for which registration was suspended by the SOR, so that the PLMN of the UPLMN type is the lowest priority, and thus the PLMN of the OPLMN type in the PLMN search result is the highest priority.

It should be noted that, for the same type of PLMN, multiple priorities may also be included, for example, a PLMN of a UPLMN type may also include a first priority, a second priority, and the like, and a PLMN of an OPLMN type may also include a first priority, a second priority, and the like, for example, UPLMN1 represents a PLMN of the first priority in the UPLMN category, and UPLMN2 represents a PLMN of the second priority in the UPLMN category; OPLMN1 refers to a first priority PLMN in the OPLMN category and OPLMN2 refers to a second priority PLMN in the OPLMN category. When the PLMN search result includes a plurality of PLMNs of the UPLMN type, for example, including UPLMN1 and UPLMN2, where UPLMN1 is included in the PLMN list whose registration is suspended by the SOR, the priority of UPLMN1 is the lowest priority, but the priority of UPLMN2 is not affected, and then the highest priority in the PLMN search result is UPLMN2.

As an example, the PLMN where the UE currently resides is PLMN1, and the UE may obtain an EPLMN list stored by the UE, for example, the EPLMN list includes PLMN1 and PLMN3, and the priority order of the PLMN types of PLMN1 to PLMN3 is: PLMN1> PLMN2> PLMN3. It should be noted that, regardless of whether the EPLMN list is stored in the UE, as long as the currently camped PLMN is located in the PLMN list that has been registered due to SOR suspension, the priority of the currently camped PLMN is the lowest priority.

If the currently camped PLMN is not located in the PLMN list for which registration was suspended due to SOR and the EPLMN list is stored in the UE, the priority of the currently camped PLMN may be determined according to the priority order specified in protocol 23.122 and/or according to the EPLMN list.

Illustratively, the UE selecting the PLMN with the highest priority among the PLMNs may include: the UE attempts to camp on the highest priority PLMN. For example, in a PLMN search scenario where a recovery of service is attempted in a offline state, after determining a PLMN with the highest priority, a search for a suitable (able) cell in the PLMN may be attempted. If the failed cell cannot be found, the PLMN can be excluded, the PLMN with the highest priority is determined as the PLMN in the remaining PLMNs in the PLMN search result, and the failed cell in the PLMN is attempted to be searched. Until a failed cell is found, or a failed cell search is performed for all PLMNs.

It can be seen that, according to the above method provided in this embodiment of the present application, a PLMN with the highest priority may be determined according to a PLMN list for which registration is suspended by an SOR, so as to select a PLMN. In the process, the PLMN in the PLMN list which is registered due to the suspension of the SOR is regarded as the lowest priority, so that the stability of a communication system can be ensured, the priority processing of the PLMN in the list under different scenes is unified, and the unification of the priority of the same PLMN in different scenes is realized.

In the embodiments shown in fig. 4 or fig. 5, the process of determining the priority of PLMNs according to the PLMN list registered due to SOR suspension and selecting the PLMN with the highest priority is described, and some embodiments of the present application may further include a related step of configuring/maintaining the PLMN list registered due to SOR suspension. Referring to fig. 6, a method flowchart of another example of a method for determining a priority of a PLMN according to an embodiment of the present application is shown, where the method includes the following steps:

step S610, the UE initiates registration of the first PLMN.

In this embodiment, the UE may determine, through an automatic mode or a manual mode, a PLMN to be registered, which may be the first PLMN. For example, when the UE is in a roaming state, the UE may determine a first PLMN according to a user operation, or the UE may select any PLMN from the VPLMNs as the first PLMN, or may select a PLMN with a highest priority as the first PLMN according to priorities of multiple VPLMNs.

After the UE selects the first PLMN, registration of the first PLMN may be initiated with the network device. For example, the UE sends a registration request message to the network device corresponding to the first PLMN, where the registration request message may include identification information of the first PLMN, identification information of the UE, and the like, and the registration request message is similar to the registration request message in step S302 shown in fig. 3 and is not described herein again.

It should be understood that a network device corresponding to a first PLMN may be understood as a network device that may be used to access the first PLMN. Taking the communication system shown in fig. 1B as an example, if the first PLMN is PLMN3, the network device corresponding to the first PLMN is network device 104; if the first PLMN is PLMN4, the network device corresponding to the first PLMN is the network device 105.

Step S620, after receiving the registration request initiated by the UE, the network device sends a registration response message to the UE.

In this embodiment, the registration response message may be a registration accept message or a downlink Non Access Stratum (NAS) transport message. For example, after receiving the registration request message sent by the UE, the network device may send a registration accept message or a downlink NAS transport message to the UE. The configuration information of the first PLMN, SOR information, etc. may be included, which is similar to step S303 shown in fig. 3 and will not be described herein again.

For SOR information, there are, but not limited to, the following two cases:

in a first case, if the network device determines that the first PLMN is abnormal, the network device may not carry SOR information in the registration accept message or the downlink NAS transport message, or may not carry preset SOR information in the registration accept message or the downlink NAS transport message, where part of information used for security check in the preset SOR information is an error.

In the second case, if the network device determines that the first PLMN is in a normal state, the SOR information may be carried in the registration accept message or the downlink NAS transport message, and part of the information used for security check in the SOR information is correct.

In this embodiment of the present application, initiating, by the UE, registration of the first PLMN to the network device may be understood as initiating, by the UE, initial registration to the first PLMN, and in this case, the network device may carry the SOR information in a registration accept message or a downlink NAS transport message. Of course, if the UE disconnects after sending the initial registration to the first PLMN in the subsequent registration process, for example, and then the UE initiates registration to the first PLMN again, the network device may also feed back the SOR information according to the registration operation sent by the UE, and the UE initiating registration to the network device for the first PLMN may also be understood as a registration process after the initial registration initiated for the first PLMN, which is not limited herein.

Step S630, the UE determines that the registration of the first PLMN is suspended due to SOR according to the registration accept message or the downlink NAS transport message.

Specifically, after the UE receives the registration accept message or the downlink NAS transport message, it is determined whether the registration of the first PLMN is suspended due to SOR according to whether the registration accept message or the downlink NAS transport message carries SOR information or whether security check of the SOR information is correct. For example, the received registration acceptance message or downlink NAS transport message is analyzed, and if it is determined that the message does not include SOR information, it is determined that the registration of the first PLMN is suspended due to SOR; or if the message includes the SOR information but the security check of the SOR information fails, determining that the registration of the first PLMN is terminated due to the SOR. And if the SOR information is acquired after the received registration acceptance message or the downlink NAS transmission message is analyzed, and the safety check of the SOR information is successful, determining that the first PLMN does not have the SOR and the registration is stopped.

Of course, one is not excluded: the registration accept message or the downlink NAS transport message sent by the network device includes the SOR information, but the registration accept message or the downlink NAS transport message received by the UE does not include the SOR information due to a packet loss occurring in the transmission process, and in this case, the UE may also determine that the registration of the first PLMN is suspended due to the SOR. Or, the UE may also determine whether the first PLMN is terminated due to SOR through other information in the registration accept message or the downlink NAS transport message, in this embodiment of the present application, a specific process of determining whether the first PLMN is terminated due to SOR by the UE is not limited.

Step S640, if the registration of the first PLMN is terminated due to SOR, the UE adds the first PLMN to the PLMN list where the registration is terminated due to SOR.

In case of a registration termination due to SOR, the UE adds the first PLMN to the list of PLMNs registered due to SOR. The PLMN list including the visited PLMN including the access technology will not include the HPLMN because the SOR has terminated registration. And, any type of VPLMN may be included in the PLMN list for registration suspension by SOR, for example, the VPLMN and the OPLMN may be included.

Step S650, the UE obtains the PLMN search result.

Step S660, determining that the first PLMN is the lowest priority PLMN when the PLMN search result includes the first PLMN and the first PLMN exists in the PLMN list for which registration is suspended by the roaming guidance SOR, where the first PLMN is a user-controlled PLMN including an access technology.

And step S670, selecting the PLMN with the highest priority in the PLMN search result according to the PLMN list which is stopped to be registered due to the SOR, wherein the PLMN with the highest priority in the PLMN list which is stopped to be registered due to the SOR is the lowest.

Steps S650 to S670 are similar to steps 510 to S530, and are not described herein again.

The specific arrangement and implementation of the embodiments of the present application are described above from different perspectives by way of a plurality of embodiments. In order to more clearly understand the technical idea of the embodiments of the present application, several application examples are provided below to further describe the solution of the embodiments of the present application in a specific scenario.

Application example 1

Fig. 7 shows a flowchart of a first application example of the embodiment of the present application. This application example is an example in a high priority PLMN search scenario. As shown in fig. 7, in this application example, the method provided in the embodiment of the present application includes the following steps:

step S701, the UE is in an automatic network selection mode and resides on the UPLMN1. Wherein the USIM card of the UE configures Service n 127 to indicate that SOR information should be received from a VPLMN when the UE initiates an initial registration onto the VPLMN.

In this application example, the UPLMN1 is a PLMN of the UPLMN type with a priority of the first priority.

Step S702, the UE sends a registration request for registering the UPLMN1 to the network device, and the network device receives the registration request.

Step S703, the network device sends a registration accept message to the UE, and the UE receives the registration accept message.

Step S704, the UE determines that the registration accept message does not include the SOR information, or the SOR information is parsed from the registration accept message but the security check of the SOR information fails.

Step S705, the UE adds UPLMN1 to the PLMN list for registration suspension by SOR.

Step S706, the UE still resides in UPLMN1 and enters an idle state.

And step S707, triggering high-priority network selection when a high-priority timer of the UE is overtime, and searching the PLMN by the UE.

Step S707, the UE obtains the PLMN search result.

As an example, the PLMN search result includes: OPLMN1, OPLMN2 and UPLMN1. The preset priority order is as follows: UPLMN 1> OPLMN2.

Step S709, the UE determines the PLMN with the highest priority in the resident PLMNs and the PLMN search result.

In this application example, the UE determines the UPLMN1 as the lowest priority UPLMN. Therefore, the UE reorders the PLMN search results, with the priority order being OPLMN 1> OPLMN 2> UPLMN1, thereby obtaining that the PLMN with the highest current priority is OPLMN1.

Step S710, the UE resides on the PLMN with the highest priority.

In this example, since OPLMN1 has the highest priority, the UE camps on OPLMN1.

It can be seen that in the present application example, when the high priority timer expires to trigger the PLMN search, the UE regards UPLMN in the PLMN list for which registration was suspended by the SOR as the lowest priority PLMN. And if other PLMNs with higher priority exist, triggering high-priority network selection to other PLMNs. Different priority processing is not used due to different network selection modes or scenes of the UE.

Application example two

Fig. 8 shows a flowchart of application example two in the embodiment of the present application. The application example is an example in a PLMN search scenario performed when the UE attempts recovery from the offline. As shown in fig. 8, in this application example, the method provided in the embodiment of the present application includes the following steps:

step S801, the UE is in an automatic network selection mode and resides on the UPLMN1. Wherein the USIM card of the UE configures Service n 127 to indicate that SOR information should be received from a VPLMN when the UE initiates an initial registration onto the VPLMN.

Step S802, the UE sends a registration request for registering UPLMN1 to the network equipment, and the network equipment receives the registration request.

Step S803, the network device sends a registration accept message to the UE, and the UE receives the registration accept message.

Step S804, the UE determines that the registration accept message does not include the SOR information, or the SOR information is parsed from the registration accept message but the security check of the SOR information fails.

Step S805, the UE adds UPLMN1 to the PLMN list for registration suspension by SOR.

Step S806, the UE still resides in the UPLMN1 and enters an idle state.

In step S807, the UE performs PLMN search without preferentially attempting the RPLMN because it is determined that the RPLMN is present in the PLMN list for which registration has been suspended by SOR (OOS).

Step S808, the UE acquires a PLMN search result.

Step S809, the UE determines the PLMN with the highest priority among the camped PLMNs and the PLMN search results.

Step S810, the UE resides on the PLMN with the highest priority.

In this example, since OPLMN1 has the highest priority, the UE camps on OPLMN1 and makes a second attempt to search for a survivable cell.

It can be seen that in the present application example, the UE attempts to resume normal service off-line, performs a PLMN search, and is considered the lowest priority PLMN since UPLMN1 is present in the list of registration aborted by SOR. And the UE sorts the PLMNs reported by the access layer according to the priority and sequentially tries to search the survivable cells.

Application example three

Fig. 9 is a flowchart illustrating application example three according to the embodiment of the present application. As shown in fig. 9, in this application example, the method provided in this embodiment includes the following steps:

step S901, the UE stays in the UPLMN1 in the automatic network selection mode. Wherein the USIM card of the UE configures Service n 127 to indicate that SOR information should be received from a VPLMN when the UE initiates an initial registration onto the VPLMN.

Step S902, the UE sends a registration request for registering the UPLMN1 to the network device, and the network device receives the registration request.

Step S903, the network equipment sends a registration acceptance message to the UE, and the UE receives the registration acceptance message.

Step S904, the UE determines that the registration accept message does not include the SOR information, or the SOR information is parsed from the registration accept message but the security check of the SOR information fails.

Step S905, the UE adds UPLMN1 to the PLMN list for registration suspension by the SOR.

Step S906, the UE still resides in UPLMN1 and enters an idle state.

Step 907 is to determine that the RPLMN is present in the PLMN list for which registration was suspended by SOR because the UE has an out-of-network (OOS) and to perform PLMN search without preferentially attempting the RPLMN.

Step S908, the UE obtains a PLMN search result.

Step S909, the UE determines the PLMN with the highest priority among the resident PLMNs and the PLMN search result.

In this application example, the UE determines UPLMN1 as the lowest priority UPLMN. Therefore, the UE reorders the PLMN search results, with the priority order being OPLMN 1> OPLMN 2> UPLMN1, thereby obtaining that the PLMN with the highest current priority is OPLMN1.

Step S910, the UE resides on the PLMN with the highest priority.

Step S911, the UE restores normal service and resides on the OPLMN1.

Step S912, the high priority timer of the UE is overtime, the high priority network selection is triggered, and the UE searches the PLMN.

Step S913, the UE obtains a PLMN searching result.

As an example, the PLMN search result includes: OPLMN1, OPLMN2 and UPLMN1.

Step S914, the UE determines the PLMN with the highest priority among the camped PLMNs and the PLMN search results.

In this application example, the UE determines UPLMN1 as the lowest priority UPLMN. Therefore, the UE reorders the PLMN search results, and the priority order is OPLMN 1> OPLMN 2> UPLMN1, so as to obtain that the PLMN with the highest current priority is OPLMN1.

Step S915, the UE camps on the PLMN with the highest priority.

In this application example, OPLMN1 remains resident in OPLMN1 because OPLMN1 has the highest priority.

It can be seen that in the present application example, whether the UE attempts to recover normal service in offline mode, instructs the access stratum to perform PLMN search, or the high priority timer times out to trigger PLMN search, the UE regards UPLMN1 existing in the list of registration suspended by SOR as the lowest priority PLMN, and does not use different priority processing due to different network selection modes or different scenarios of the UE.

It should be noted that, in the actual use process, the foregoing embodiments may also be combined, for example, after the embodiment shown in fig. 6 is executed, the embodiment shown in fig. 5 is executed, and of course, other combination manners are also possible, and the present invention is not limited herein.

In the above embodiment, after obtaining the PLMN search result, the user equipment regards the first PLMN in the PLMN list that exists in the PLMN search result and is terminated by the SOR at the same time as the PLMN of the lowest priority, and does not use different priority processing modes for the PLMN terminated by the SOR because of different network selection modes or different scenarios of the user equipment, and can avoid selecting a network to the PLMN including the access technology controlled by the user in the PLMN list terminated by the SOR, thereby implementing the unification of the priorities of the same PLMN in different scenarios, and improving the stability of the communication system.

The above-mentioned scheme provided by the embodiments of the present application is mainly introduced from the perspective of interaction between a network device and a user equipment. It is understood that, in order to implement the above functions, the network device or the user equipment may include a corresponding hardware structure and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed in hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

Referring to fig. 10, a block diagram of an exemplary structure of a device for determining a priority of a public land network according to an embodiment of the present application is provided. The apparatus 1000 may be in the form of software. The apparatus 1000 may include: a processing unit 1001 and a communication unit 1002. The processing unit 1001 is used for controlling and managing the operation of the apparatus 1000. The communication unit 1002 is configured to support communication of the apparatus 1000 with other network entities. Optionally, the communication unit 1002, also referred to as a transceiving unit, may comprise a receiving unit and/or a transmitting unit for performing receiving and transmitting operations, respectively. The apparatus 1000 may further comprise a storage unit 1003 for storing program codes and/or data of the apparatus 1000.

Among other things, the processing unit 1001 may be a processor or controller that may implement or execute the various illustrative logical blocks, modules, and circuits described in connection with the embodiment disclosure of the present application. The communication unit 1002 may be a communication interface, a transceiver or a transceiver circuit, etc., wherein the communication interface is referred to as a generic term, and in a specific implementation, the communication interface may include a plurality of interfaces. The storage unit 1003 may be a memory.

The apparatus 1000 may be the user equipment in any of the above embodiments, or may also be a chip disposed in the user equipment. The processing unit 1001 may enable the apparatus 1000 to perform the actions of the user equipment in the above method examples. For example, for performing the steps in the embodiments shown in fig. 5-7.

The communication unit 1002 may support communication between the apparatus 1000 and a network device, for example, for performing step S410 in the embodiment shown in fig. 4, and/or for performing step S510 in the embodiment shown in fig. 5, and/or for performing step S610, step S630, and step S650 in the embodiment shown in fig. 6.

It should be noted that, in the embodiment of the present application, the division of the unit (module) is schematic, and is only a logic function division, and there may be another division manner in actual implementation. Each functional module in the embodiments of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be substantially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in a software product, which is stored in a storage medium and includes several instructions, so that a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) executes all or part of the steps of the method described in the embodiments of the present application. The storage medium may be any of various media that can store program codes, such as a memory.

Fig. 11 shows a device 1100 for determining a priority of a PLMN according to an embodiment of the present application, where the device 1100 may be a user equipment, and is capable of implementing a function of the user equipment in the method according to the embodiment of the present application; the apparatus 1100 may also be an apparatus capable of supporting a user equipment to implement the function of the user equipment in the method provided by the embodiment of the present application. The apparatus 1100 may be a chip system. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.

In a hardware implementation, the communication module 1102 may be a transceiver integrated in the apparatus 1100 to form the communication interface 1110.

The apparatus 1100 comprises at least one processor 1120 for implementing or for enabling the apparatus 1100 to implement the functionality of the user equipment in the methods provided by embodiments of the present application. For example, the processor 1120 may select a precoding matrix for CQI calculation from the set of precoding matrices, which is specifically described in the method example and is not described herein again.

The apparatus 1100 may also include at least one memory 1130 for storing program instructions and/or data. A memory 1130 is coupled to the processor 1120. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. The processor 1120 may operate in conjunction with the memory 1130. Processor 1120 may execute program instructions stored in memory 1130. At least one of the at least one memory may be included in the processor.

Apparatus 1100 may also include a communication interface 1110 for communicating with other devices over a transmission medium such that the apparatus used in apparatus 1100 may communicate with other devices. Illustratively, the other device may be a network-side device. Processor 1120 can transceive data using communication interface 1110. The communication interface 1110 may specifically be a transceiver.

The embodiment of the present application does not limit the specific connection medium among the communication interface 1110, the processor 1120, and the memory 1130. In the embodiment of the present application, the memory 1130, the processor 1120 and the communication interface 1110 are connected by the bus 1140 in fig. 11, the bus is represented by a thick line in fig. 11, and the connection manner between other components is merely illustrative and not limited. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 11, but that does not indicate only one bus or one type of bus.

In the present embodiment, the processor 1120 can be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or execute the methods, steps, and logic blocks disclosed in the present embodiment. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

In the embodiment of the present application, the memory 1130 may be a non-volatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example. The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.

An embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions, and when the computer instructions are executed on an electronic device, the electronic device is caused to execute the foregoing method for determining the priority of the public land network PLMN.

The computer-readable storage medium described above may take any combination of one or more computer-readable media. A computer readable medium may be a computer, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM) or flash memory, an optical fiber, a portable compact disc read only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, radio Frequency (RF), etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present description may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).

The embodiments of the present application also provide a computer program product, which when run on a computer, causes the computer to execute some or all of the steps in the above method embodiments.

The embodiment of the present application provides a chip system, where the chip system includes a processor and may further include a memory, and is used to implement the function of the user equipment in the foregoing method. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

The embodiment of the present application provides a system, where the system includes the foregoing apparatus and a network device.

Through the description of the above embodiments, those skilled in the art will understand that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to perform all or part of the functions described above.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a module or a unit is only one type of logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another apparatus, or some features may be omitted, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for determining a priority of a public land network, PLMN, comprising:

obtaining a public land network (PLMN) search result;

2. The method of claim 1, wherein obtaining the PLMN search result comprises:

acquiring the PLMN search result under the condition that a high-priority timer is overtime, wherein the high-priority timer is used for periodically triggering PLMN selection; or the like, or a combination thereof,

and the terminal equipment is in a offline state, the PLMN list which is stopped to be registered due to the SOR comprises the registered PLMN, and the PLMN searching result is obtained.

3. The method of claim 2, further comprising:

and selecting the PLMN with the highest priority in the PLMN search results according to the PLMN list which is stopped registering due to the SOR, wherein the PLMN with the lowest priority in the PLMN list which is stopped registering due to the SOR.

4. The method of claim 3, wherein if a user-controlled PLMN including an access technology is included in the search result, and the user-controlled PLMN including an access technology is included in the list of PLMNs registered due to SOR suspension, the PLMN with the highest priority is an operator-controlled PLMN including an access technology.

5. The method according to any of claims 1-4, wherein prior to said obtaining public land mobile network, PLMN, search results, the method further comprises:

initiating registration of a first PLMN;

and in case that the registration of the first PLMN is terminated due to the roaming-oriented SOR, adding the first PLMN to the PLMN list in which the registration is terminated due to the roaming-oriented SOR.

6. The method of claim 5, wherein after the performing registration with the first PLMN, the method further comprises:

receiving a registration acceptance message or a downlink NAS transmission message;

and determining that the first PLMN is terminated due to the SOR registration according to the registration acceptance message or the downlink NAS transmission message.

7. The method according to claim 5 or 6, wherein the first PLMN being terminated by a SOR registration comprises: not acquiring the SOR information or failing to perform security check on the SOR information.

8. The method according to any of claims 1-7, wherein the PLMN list that was registered due to SOR termination includes the PLMN containing the access technology at the visited place.

9. An apparatus for determining a priority of a public land network (PLMN), comprising:

the communication unit is used for acquiring a public land network (PLMN) search result;

10. A user equipment, characterized by comprising a memory in which a computer program is stored and a processor configured to implement the method according to any of claims 1 to 8 when executing the computer program.

11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method according to any one of claims 1 to 8.