WO2024016178A1 - Network selection method and apparatus, device, storage medium and program product - Google Patents

Abstract

A network selection method and apparatus, a device, a storage medium and a program product, relating to the technical field of communications. The method comprises: an access layer sending first information to a high layer, the first information being used for indicating PLMNs having signal quality greater than a threshold value (310). An access layer indicates PLMNs having better signal quality for a high layer, so that when selecting a PLMN, the high layer can select a target PLMN from the PLMNs having better signal quality, so as to ensure that a finally selected target PLMN is a PLMN having better signal quality, thereby improving the communication quality.

Description

Network selection methods, devices, equipment, storage media and program products Technical field

The embodiments of the present application relate to the field of communication technology, and in particular to a network selection method, device, equipment, storage medium and program product.

Background technique

The mobile phone will select PLMN (Public Land Mobile Network) when it is just turned on or enters idle state. When PLMN selection is required, the NAS (Non-access Stratum, non-access layer) of the mobile phone chip will trigger the access layer to read the system information of the surrounding cells and obtain the identification of the PLMN to which the surrounding cells belong from the system information. The access layer then reports the identity of the above-mentioned PLMN to the NAS layer, and the NAS layer selects the final PLMN.

In related technologies, when the NAS layer selects a PLMN, it will give priority to the priority of the PLMN to select the corresponding HPLMN (Home Public Land Mobile Network, belonging to the public land mobile network) or EHPLMN (Equivalent Home Public Land Mobile Network, equivalent to the public land network) mobile network). Therefore, even if the signal quality of a high-priority PLMN is very poor, this PLMN will be selected, resulting in unguaranteed communication quality.

Contents of the invention

Embodiments of the present application provide a network selection method, device, equipment, storage medium and program product. The technical solutions are as follows:

According to one aspect of the embodiment of the present application, a network selection method is provided. The method is executed by a terminal device. The terminal device includes an access layer and a higher layer. The method includes:

The access layer sends first information to the higher layer, where the first information is used to indicate a PLMN whose signal quality is greater than a threshold.

According to one aspect of the embodiment of the present application, a network selection device is provided. The device is provided in a terminal device. The terminal device includes an access layer and a high layer. The device includes:

The first sending module is configured to send first information to the higher layer through the access layer, where the first information is used to indicate a PLMN whose signal quality is greater than a threshold value.

According to an aspect of the embodiment of the present application, a terminal device is provided. The terminal device includes a processor and a memory. A computer program is stored in the memory. The processor executes the computer program to implement the above network selection method. .

According to one aspect of the embodiments of the present application, a computer-readable storage medium is provided. A computer program is stored in the storage medium, and the computer program is used to be executed by a processor to implement the above network selection method.

According to one aspect of an embodiment of the present application, a chip is provided. The chip includes programmable logic circuits and/or program instructions, and is used to implement the above network selection method when the chip is running.

According to an aspect of an embodiment of the present application, a computer program product is provided. The computer program product includes computer instructions. The computer instructions are stored in a computer-readable storage medium. A processor reads the computer-readable storage medium from the computer-readable storage medium. Obtain and execute the computer instructions to implement the above network selection method.

The technical solutions provided by the embodiments of this application may include the following beneficial effects:

The first information is sent to the higher layer through the access layer, and the first information is used to indicate to the higher layer PLMNs whose signal quality is greater than the threshold value. Simply put, it can be understood as indicating to the upper layer through the access layer PLMNs with better signal quality, so that When selecting a PLMN, the higher layer can select a target PLMN from these PLMNs with better signal quality to ensure that the final selected target PLMN is a PLMN with better signal quality, thereby improving communication quality.

Description of drawings

Figure 1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

Figure 2 is a schematic diagram of an HPLMN provided by an embodiment of the present application;

Figure 3 is a flow chart of a network selection method provided by an embodiment of the present application;

Figure 4 is a flow chart of a network selection method provided by another embodiment of the present application;

Figure 5 is a flow chart of a network selection method provided by another embodiment of the present application;

Figure 6 is a flow chart of a network selection method provided by another embodiment of the present application;

Figure 7 is a block diagram of a network selection device provided by an embodiment of the present application;

Figure 8 is a block diagram of a network selection device provided by another embodiment of the present application;

Figure 9 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

The network architecture and business scenarios described in the embodiments of this application are to more clearly explain the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those of ordinary skill in the art will know that with the network architecture evolution and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

The network architecture and business scenarios described in the embodiments of this application are to more clearly explain the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those of ordinary skill in the art will know that with the network architecture evolution and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (Code Division Multiple Access, CDMA) system, broadband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system , New Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), wireless fidelity (Wireless Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.

Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, or Vehicle to everything (V2X) communication, etc. , the embodiments of the present application can also be applied to these communication systems.

The communication system in the embodiment of this application can be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or a standalone (Standalone, SA) network deployment scenario.

The communication system in the embodiment of the present application can be applied to the unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or the communication system in the embodiment of the present application can also be applied to the licensed spectrum, where the licensed spectrum can also be Considered a non-shared spectrum.

The embodiments of the present application can be applied to non-terrestrial communication network (Non-Terrestrial Networks, NTN) systems, and can also be applied to terrestrial communication network (Terrestrial Networks, TN) systems.

Please refer to Figure 1, which shows a schematic diagram of a network architecture 100 provided by an embodiment of the present application. The network architecture 100 may include: terminal equipment 10, access network equipment 20 and core network equipment 30.

The terminal equipment 10 may refer to a UE (User Equipment), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent or a user device. Optionally, the terminal device 10 may also be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, or a PDA (Personal Digital Assistant). , handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5GS (5th Generation System, fifth-generation mobile communication system) or future evolved PLMNs (Public Land Mobile Network, public land mobile communication network) terminal equipment, etc., the embodiments of the present application are not limited to this. For convenience of description, the devices mentioned above are collectively referred to as terminal devices. The number of terminal devices 10 is usually multiple, and one or more terminal devices 10 may be distributed in the cell managed by each access network device 20 . In the embodiments of this application, "terminal equipment" and "UE" are often used interchangeably, but those skilled in the art can understand that the two usually express the same meaning.

The access network device 20 is a device deployed in the access network to provide wireless communication functions for the terminal device 10 . The access network device 20 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with access network device functions may be different. For example, in 5G NR systems, they are called gNodeB or gNB. As communication technology evolves, the name "access network equipment" may change. For convenience of description, in the embodiment of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 10 are collectively referred to as access network devices. Optionally, through the access network device 20, a communication relationship can be established between the terminal device 10 and the core network device 30. For example, in an LTE (Long Term Evolution) system, the access network device 20 may be EUTRAN (Evolved Universal Terrestrial Radio Access Network) or one or more eNodeBs in EUTRAN; In the 5G NR system, the access network device 20 may be a RAN (Radio Access Network) or one or more gNBs in the RAN. In the embodiment of this application, the "network device" refers to the access network device 20, such as a base station, unless otherwise specified.

The core network device 30 is a device deployed in the core network. The core network device 30 mainly functions to provide user connections, manage users, and carry services, and serves as an interface for the bearer network to provide to external networks. For example, the core network equipment in the 5G NR system can include AMF (Access and Mobility Management Function, access and mobility management function) entities, UPF (User Plane Function, user plane function) entities and SMF (Session Management Function, session management Function) entity and other equipment.

In some embodiments, the access network device 20 and the core network device 30 communicate with each other through some air interface technology, such as the NG interface in the 5G NR system. The access network device 20 and the terminal device 10 communicate with each other through some air interface technology, such as the Uu interface.

The "5G NR system" in the embodiments of this application may also be called a 5G system or an NR system, but those skilled in the art can understand its meaning. The technical solution described in the embodiment of this application can be applied to the LTE system, the 5G NR system, the subsequent evolution system of the 5G NR system, and can also be applied to applications such as NB-IoT (Narrow Band Internet of Things, narrowband Internet of Things) systems and other communication systems, this application does not limit this.

In this embodiment of the present application, network equipment can provide services for a cell, and terminal equipment communicates with the network equipment through transmission resources (for example, frequency domain resources, or spectrum resources) on carriers used by the cell. The cell can be The cell corresponding to the network equipment (such as the base station). The cell can belong to the macro base station or the base station corresponding to the small cell (Small cell). The small cell here can include: urban cell (Metro cell), micro cell (Micro cell), Pico cells, Femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-rate data transmission services.

Before introducing the technical solutions of this application, some background technical knowledge involved in this application will be introduced and explained. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application. The embodiments of this application include at least part of the following content.

The terminal device (such as a mobile phone) will perform PLMN selection when it is just turned on or enters an idle state.

When PLMN selection is required, the chip of the terminal device will read "HPLMN Selector with Access Technology" and "User Controlled PLMN Selector with" from the SIM (Subscriber Identity Module) card. Access Technology (User-controlled HPLMN Selector and Access Technology)", "Forbidden PLMNs (forbidden PLMNs)", "Equivalent HPLMN (EHPLMN)", "Operator controlled PLMN Selector with Access Technology (Operator-controlled PLMN Selector and access technology)" and other documents.

The NAS layer of the chip will trigger the access layer to read the system information of the surrounding cells and obtain the PLMN ID (PLMN Identifier, PLMN identification) of the surrounding cells from the system information. The access layer then reports these PLMN IDs to the NAS layer, and the NAS layer selects the final PLMN. In addition, the access layer will also report the PLMN signal quality lower than -110dB to the NAS layer, that is, the PLMN ID and its signal quality.

The NAS layer follows the following sequence when selecting a PLMN:

(1)either the HPLMN(if the EHPLMN list is not present or is empty)or the highest priority EHPLMN(equivalent HPLMN)that is available(if the EHPLMN list is present), that is, HPLMN(if the EHPLMN list does not exist or is empty ) or the highest priority EHPLMN available (if a list of EHPLMNs exists).

HPLMN ID (HPLMN Identifier, HPLMN identification) can be obtained from the IMSI (International Mobile Subscriber Identity, International Mobile Subscriber Identity) of the SIM card. As shown in Figure 2, HPLMN is MCC+MNC (Mobile Country Code and Mobile Network Code, mobile device country code and mobile device network code) in IMSI.

At the same time, there is HPLMN Selector with Access Technology in the SIM card, as shown in Table 1. The higher the priority in the table, the higher the priority.

For example, if a mobile 4G card is configured with LTE (Long Term Evolution) > 2G, then when the UE selects PLMN, it will select the mobile 4G network + LTE access technology. When there is no 4G network coverage around, the UE will select PLMN+2G.

It can be considered that EHPLMN and HPLMN provide the same services to UE and have the same function as HPLMN. Therefore, the RAT (Radio Access Type) priority in Table 1 also applies to EHPLMN.

(2)each PLMN/access technology combination in the "User Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order), that is, the "User Controlled PLMN Selector with Access Technology" data file in the SIM card for each PLMN/access technology combination (in order of priority).

(3)each PLMN/access technology combination in the "Operator Controlled PLMN Selector with Access Technology" data file in the SIM (in priority order) or stored in the ME (Management Engine) (in priority order), that is, each PLMN/access technology combinations are stored in the SIM card (in order of priority) or in the "Operator Controlled PLMN Selector and Access Technology" data file in the ME (in order of priority).

Operator Controlled PLMN Selector with Access Technology is shown in Table 2. Each PLMN is followed by a RAT. The higher the order in the table, the higher the priority.

(4) Other PLMN/access technology combinations with received high quality signal in random order, that is, other PLMN/access technology combinations that can receive high quality signals in random order.

(5) other PLMN/access technology combinations in order of decreasing signal quality, that is, other PLMN/access technology combinations, arranged in order of decreasing signal quality.

Table 1: RAT priority of HPLMN Selector with Access Technology

Table 2: RAT priority of Operator Controlled PLMN Selector with Access Technology

It can be seen from the above sequence of PLMN selection that the UE gives priority to the priority of the PLMN and only considers the signal quality in the last step. In other words, even if the signal quality of a high-priority PLMN is very poor, the UE will select this PLMN, and the communication quality is not guaranteed.

Please refer to Figure 3, which shows a flow chart of a network selection method provided by an embodiment of the present application. The method can be executed by a terminal device, which includes an access layer and a higher layer. The method may include the following steps:

Step 310: The access layer sends first information to the higher layer. The first information is used to indicate the PLMN whose signal quality is greater than the threshold.

Access Stratum (AS for short) refers to the functional layer in the wireless communication protocol stack that directly faces user connection or access.

In the wireless communication protocol stack, the upper layer is located above the access layer and refers to the functional layer located above the access layer. In some embodiments, the upper layer may be a NAS layer. In some embodiments, the high layer may also be an application layer or a non-standard defined functional layer, which is not limited in the embodiments of the present application.

In some embodiments, higher layers indicate operator-provided thresholds to the access layer. For example, the higher layer sends indication information indicating the threshold value to the access layer. The indication information may be the threshold value itself, or may be any information capable of determining the threshold value, which is not limited in this application.

In some embodiments, the threshold value is configured in the USIM (Universal Subscriber Identity Module) of the terminal device. For example, the threshold value is configured in the SIM card of the terminal device, and the upper layer can obtain the threshold value from the SIM card. By configuring the threshold value provided by the operator in the USIM, the terminal device can obtain the threshold value even before it is connected to the network, and then filter out PLMNs with better signal quality based on the threshold value.

In some embodiments, the signal quality can be represented by RSRP (Reference Signal Receiving Power, reference signal receiving power), or the signal quality can also be represented by RSRQ (Reference Signal Receiving Quality, reference signal receiving quality) or SINR (Signal to Interference plus Noise) Ratio, signal to interference plus noise ratio) and other other parameters, which are not limited in this application.

The technical solution provided in this embodiment sends the first information to the higher layer through the access layer, and uses the first information to indicate to the higher layer PLMNs whose signal quality is greater than the threshold value. Simply put, it can be understood as indicating to the higher layer through the access layer. PLMNs with better signal quality allow higher-level managers to select target PLMNs from these PLMNs with better signal quality when selecting PLMNs, ensuring that the final selected target PLMN is a PLMN with better signal quality, thereby improving communication quality.

Please refer to FIG. 4 , which shows a flow chart of a network selection method provided by another embodiment of the present application. The method can be executed by a terminal device, which includes an access layer and a higher layer. The method may include at least one of the following steps 410 to 450:

Step 410: The higher layer sends a first request to the access layer. The first request is used to request the access layer to report available PLMNs.

Available PLMNs refer to PLMNs that can be selected by higher layers for PLMN selection.

In some embodiments, higher layers indicate operator-provided thresholds to the access layer. In addition, the indication information used to indicate the threshold value may be carried in the first request and sent, or may be sent independently from the first request, which is not limited in this application.

Step 420: When the access layer searches for a PLMN whose signal quality is greater than the threshold value, the access layer sends the first information to the higher layer. The first information includes the first PLMN list and the second PLMN list; where, the first The PLMN list includes the identity of at least one PLMN whose signal quality is greater than the threshold value, and the second PLMN list includes the identity of at least one PLMN whose signal quality is less than the threshold value.

The terminal device can search the PLMNs around it through the access layer, and measure the signal quality of each searched PLMN. Combined with the above threshold value, it can filter out the signal quality greater than the threshold value from each searched PLMN. PLMN. The access layer constructs the first PLMN list and the second PLMN list based on the relationship between the signal quality of each searched PLMN and the threshold value. The first PLMN list includes the identity of at least one PLMN whose signal quality is greater than a threshold value, and the second PLMN list includes the identity of at least one PLMN whose signal quality is less than the threshold value.

It should be noted that in some embodiments, if the signal quality of each PLMN searched by the access layer is greater than the threshold value, or the access layer does not search for a PLMN whose signal quality is less than the threshold value, then the second The PLMN list does not exist or the second PLMN list is empty. At this time, the second PLMN list may not be included in the first information, or the second PLMN list included in the first information may be empty.

In addition, if the signal quality of each PLMN searched by the access layer is less than the threshold value, or the access layer does not search for a PLMN whose signal quality is greater than the threshold value, then the access layer performs the following step 430.

Step 430: If the access layer does not search for a PLMN whose signal quality is greater than the threshold value, the access layer sends first information to the higher layer. The first information includes a second PLMN list, and the second PLMN list includes at least one signal. Identification of PLMNs whose quality is less than the threshold.

In addition, if the access layer of the terminal device does not search for any PLMN, the access layer may send indication information that no PLMN was found to the higher layer.

After receiving the first information sent by the access layer, the higher layer performs the following steps 440 or 450 according to the first information to perform PLMN selection.

Step 440: If the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list, the higher layer selects the target PLMN in the first PLMN list.

Step 450: If the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list, the higher layer selects the target PLMN in the second PLMN list.

In some embodiments, the PLMNs that meet the above conditions include at least one of the following: HPLMN, EHPLMN.

In some embodiments, if the first information includes the first PLMN list and there are PLMNs that meet the conditions in the first PLMN list, the higher layer selects the PLMN with the highest priority among the PLMNs that meet the conditions in the first PLMN list as the target PLMN. Among them, the priority determination method of the PLMN can be the method introduced above, or other methods, which is not limited in this application.

In some embodiments, if the first information does not include the first PLMN list or there is no PLMN that meets the conditions in the first PLMN list, the higher layer selects the PLMN with the best signal quality and that meets the conditions in the second PLMN list as the Target PLMN.

In some embodiments, the second PLMN list also includes signal quality corresponding to each PLMN included in the second PLMN list.

For example, the PLMNs searched by the access layer include PLMN1, PLMN2, PLMN3, PLMN4 and PLMN5.

For example, if the signal quality of PLMN1, PLMN2 and PLMN3 searched by the access layer is greater than the threshold value, and the signal quality of PLMN4 and PLMN5 is less than the threshold value, then the first information includes the first PLMN list and the second PLMN list, The first PLMN list contains the IDs of PLMN1, PLMN2 and PLMN3, and the second PLMN list contains the IDs of PLMN4 and PLMN5 and the signal qualities corresponding to these two PLMNs respectively. When HPLMN and/or EHPLMN exist in PLMN1, PLMN2 and PLMN3, the higher layer selects the PLMN with the highest priority among HPLMN and/or EHPLM as the target PLMN. If PLMN1, PLMN2 and PLMN3 are not HPLMN or EHPLMN, the higher layer selects the PLMN with the highest signal quality among the HPLMN or EHPLMN of PLMN4 and PLMN5 as the target PLMN.

For example, if the signal qualities of PLMN1, PLMN2, PLMN3, PLMN4 and PLMN5 searched by the access layer are all less than the threshold, then the first information only includes the second PLMN list (excluding the first PLMN list), and the second The PLMN list includes the IDs of PLMN1, PLMN2, PLMN3, PLMN4, and PLMN5 and the signal qualities corresponding to these PLMNs. The higher layer selects the PLMN with the highest signal quality among the HPLMNs and EHPLMNs included in the second PLMN list as the target PLMN.

In addition, after the higher layer selects the target PLMN, it may initiate a request to the target PLMN and request access to the target PLMN.

In some embodiments, if the first PLMN list exists, the access layer sends the first information including only the first PLMN list to the higher layer, and the higher layer selects a PLMN that meets the conditions in the first PLMN list; if the first PLMN list If there is no PLMN that meets the conditions, the upper layer sends a second request to the access layer, and the access layer sends the second information including the second PLMN list to the upper layer; if the first PLMN list does not exist, the access layer sends only the second request to the upper layer. Includes the first information of the second PLMN list; if the access layer does not search for any PLMN, the access layer may send indication information that no PLMN is found to the higher layer. Through the above method, it is helpful to save the amount of data required for the first information.

In some embodiments, if there is a first PLMN list, and there is a PLMN that meets the conditions in the first PLMN list, the access layer sends the first information to the higher layer, and the first information only includes the first PLMN list; if the first PLMN There is no PLMN that meets the conditions in the list, and there is a PLMN that meets the conditions in the second PLMN list, then the access layer sends the first information including only the second PLMN list to the higher layer; if the access layer does not search for any PLMN , or the access layer does not search for any PLMN that meets the conditions, the access layer can send indication information that no PLMN was found to the higher layer.

It should be noted that in the embodiment of the present application, before the access layer sends the first information to the higher layer in step 420 and/or step 430, step 410 is included in which the higher layer sends the first request to the access layer; in step 420 and/or Step 430: Before the access layer sends the first information to the higher layer, the access layer also includes searching for available PLMNs. Step 410: The upper layer may send the first request to the access layer before the access layer searches for available PLMNs (for example, the access layer searches for available PLMNs after receiving the first request sent by the higher layer), or it may search for available PLMNs after the access layer After the PLMN is available, this application does not limit this.

In the technical solution provided by this embodiment, when the received first PLMN list contains PLMNs that meet the conditions, the higher layer selects the PLMN with the highest priority among the PLMNs that meet the conditions in the first PLMN list as the target PLMN. That is, when the signal quality of the selectable PLMNs is higher than the threshold value, the higher layer selects the PLMN according to the priority. Therefore, the higher layer can select a PLMN with good signal quality and high priority. When the received first LMN list does not contain a PLMN that meets the conditions, or the first PLMN list is not received, the higher layer selects the PLMN with the best signal quality among the PLMNs that meet the conditions in the second PLMN list as the target PLMN. That is, when the signal quality of the selectable PLMNs is lower than the threshold value, the higher layer selects the PLMN according to the signal quality to ensure the signal quality of the PLMN to improve the communication quality.

Please refer to FIG. 5 , which shows a flow chart of a network selection method provided by another embodiment of the present application. The method can be executed by a terminal device, which includes an access layer and a higher layer. The method may include at least one of the following steps 510 to 580:

Step 510: The higher layer sends a second request to the access layer. The second request is used to request the access layer to report PLMNs whose signal quality is greater than the threshold.

In some embodiments, higher layers indicate operator-provided thresholds to the access layer. In addition, the indication information used to indicate the threshold value may be carried in the second request and sent, or may be sent independently from the second request, which is not limited in this application.

Step 520: When the access layer searches for a PLMN whose signal quality is greater than the threshold, the access layer sends first information to the higher layer. The first information includes a first PLMN list, and the first PLMN list includes at least one signal quality parameter. Identification of PLMNs greater than the threshold.

The terminal device can search the PLMNs around it through the access layer, and measure the signal quality of each searched PLMN. Combined with the above threshold value, it can filter out the signal quality greater than the threshold value from each searched PLMN. PLMN. The access layer constructs a first PLMN list based on the relationship between the signal quality of each searched PLMN and the threshold value. The first PLMN list includes the identification of at least one PLMN whose signal quality is greater than the threshold value.

Optionally, the access layer also constructs a second PLMN list based on the relationship between the signal quality of each searched PLMN and the threshold value. The second PLMN list includes the identity of at least one PLMN whose signal quality is less than the threshold value. .

Optionally, the access layer further constructs a third PLMN list based on each of the searched PLMNs, where the third PLMN list includes the identities of all PLMNs searched by the access layer.

Step 530: If the access layer does not search for a PLMN whose signal quality is greater than the threshold, the access layer sends first information to the higher layer. The first information is used to indicate that no PLMN whose signal quality is greater than the threshold is found. .

Step 540: If the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list, the higher layer selects the target PLMN in the first PLMN list.

In some embodiments, the PLMNs that meet the above conditions include at least one of the following: HPLMN, EHPLMN.

In some embodiments, if the first information includes the first PLMN list and there are PLMNs that meet the conditions in the first PLMN list, the higher layer selects the PLMN with the highest priority among the PLMNs that meet the conditions in the first PLMN list as the target PLMN. Among them, the PLMN priority determination method may be the method introduced above, or other methods, which is not limited in this application.

Step 550: If the first information does not include the first PLMN list or there is no PLMN that meets the conditions in the first PLMN list, the higher layer sends a third request to the access layer. The third request is used to request the access layer to report that the signal quality is less than PLMN of threshold value.

Step 560: The access layer sends second information to the higher layer. The second information is used to indicate PLMNs whose signal quality is less than the threshold value. For example, the second information includes the second PLMN list or the third PLMN list; where, the second PLMN list The third PLMN list includes the identifier of at least one PLMN whose signal quality is less than the threshold value, and the third PLMN list includes the identifiers of all PLMNs searched by the access layer.

In some embodiments, the second information also includes: signal quality corresponding to each PLMN included in the second PLMN list; or, signal quality corresponding to each PLMN included in the third PLMN list. For example, when the second information includes the second PLMN list, the second information also includes the signal quality corresponding to each PLMN included in the second PLMN list. When the second information includes the third PLMN list, the second information also includes the signal quality corresponding to each PLMN included in the third PLMN list.

In addition, after receiving the third request sent by the higher layer, the access layer can directly use the second PLMN list or the third PLMN list determined by each previously searched PLMN (that is, constructed in the introduction part of step 520 above). the second PLMN list or the third PLMN list), and sends the second information including the second PLMN list or the third PLMN list to the higher layer. Alternatively, after receiving the third request sent by the higher layer, the access layer can search the surrounding PLMNs again, generate a second PLMN list or a third PLMN list based on the new search results, and then send the upper layer containing The second information of the second PLMN list or the third PLMN list.

Step 570: If the second information includes the second PLMN list, the higher layer selects the target PLMN in the second PLMN list.

In some embodiments, if the second information includes the second PLMN list, the higher layer selects the PLMN with the best signal quality and meeting the conditions in the second PLMN list as the target PLMN.

Step 580: If the second information includes the third PLMN list, the higher layer selects the target PLMN in the third PLMN list.

In some embodiments, if the second information includes the second PLMN list, the higher layer selects the PLMN with the best signal quality and meeting the conditions in the third PLMN list as the target PLMN.

In addition, if the access layer of the terminal device does not search for any PLMN, the access layer may send indication information that no PLMN was found to the higher layer.

For example, the PLMNs searched by the access layer include PLMN1, PLMN2, PLMN3, PLMN4 and PLMN5.

For example, the signal quality of PLMN1, PLMN2 and PLMN3 searched by the access layer is greater than the threshold value, and the signal quality of PLMN4 and PLMN5 is less than the threshold value. Then the first PLMN list includes the IDs of PLMN1, PLMN2 and PLMN3, the second PLMN list includes the IDs of PLMN4 and PLMN5 and the signal qualities corresponding to these two PLMNs respectively, and the third PLMN list includes the IDs of PLMN1, PLMN2, PLMN3, PLMN4 and PLMN5. ID and the signal quality corresponding to these five PLMNs. If PLMN1, PLMN2 and PLMN3 contain HPLMN or EHPLMN, the higher layer selects the PLMN with the highest priority among HPLMN and/or EHPLMN as the target PLMN. If PLMN1, PLMN2 and PLMN3 are not HPLMN or EHPLMN, the higher layer sends the third request to the access layer. After receiving the third request sent by the higher layer, the access layer sends the second information to the higher layer. The second information includes the second PLMN list or the third PLMN list. If the second information includes the second PLMN list, the higher layer selects the PLMN with the best signal quality among the HPLMNs and/or EHPLMNs in the second PLMN list as the target PLMN. If the second information includes the third PLMN list, the higher layer selects the PLMN with the best signal quality among the HPLMNs and/or EHPLMNs in the third PLMN list as the target PLMN.

In some embodiments, if there is a first PLMN list, and there is a PLMN that meets the conditions in the first PLMN list, the access layer sends the first information to the higher layer, and the first information only includes the first PLMN list; if the first PLMN If there is no PLMN that satisfies the condition in the list, and there is a PLMN that satisfies the condition in the second PLMN list, the access layer will send indication information to the higher layer that no PLMN whose signal quality is greater than the threshold has been found, and the access layer will send the message to the upper layer. Only the second information of the second PLMN list or the third PLMN list is included; if the access layer does not search for any PLMN, or the access layer does not search for any PLMN that meets the conditions, the access layer can send it to the higher layer. No indication information of PLMN was found.

It should be noted that in the embodiment of the present application, before the access layer sends the first information to the upper layer in step 520, the upper layer sends the first request to the access layer in step 510; and the access layer sends the first request to the upper layer in step 520. Before the information, it also includes access layer search for available PLMNs. Step 510: The upper layer sends the first request to the access layer before the access layer searches for available PLMNs (for example, the access layer searches for available PLMNs after receiving the first request sent by the higher layer), or it can also search for available PLMNs after the access layer After the PLMN is available, this application does not limit this.

In the technical solution provided by this embodiment, when the access layer searches for a PLMN whose signal quality is greater than the threshold value, the access layer only sends the first information including the first PLMN list to the higher layer, and the higher layer meets the conditions of the first PLMN list. Select the PLMN with the highest priority among the PLMNs as the target PLMN, which not only ensures that the higher layer selects a PLMN with good signal quality and high priority, but also reduces the amount of data that the higher layer needs to receive and reduces the data processing pressure on the higher layer. When there is no PLMN that meets the conditions in the first PLMN list, or the access layer does not search for a PLMN with signal quality greater than the threshold, the access layer then sends second information to the PLMN, and the second information includes the second PLMN list or Third PLMN list. The second PLMN list contains at least one PLMN whose signal quality is less than the threshold value. The third PLMN list contains all PLMNs searched by the access layer. The higher layer selects the PLMN with the highest signal quality as the target PLMN among the PLMNs that meet the conditions in the second PLMN list or the third PLMN list to ensure the signal quality of the target PLMN and improve the communication quality.

Please refer to FIG. 6 , which shows a flow chart of a network selection method provided by another embodiment of the present application. The method can be executed by a terminal device, which includes an access layer and a higher layer. The method may include at least one of the following steps 610 to 630:

Step 610: The access layer searches for available PLMNs according to the search cycle, or the access layer searches for available PLMNs according to the second trigger event.

In some embodiments, the search period is indicated by the higher layer to the access layer, or agreed upon by the protocol, or the period of background scan, or configured in the USIM of the terminal device.

In some embodiments, the second triggering event includes at least one of the following: cell reselection occurs in the terminal equipment, the terminal equipment loses network coverage, the terminal equipment is powered on, the terminal equipment exits the power saving mode, and the terminal equipment receives discontinuous paging transmission Before or when the window arrives.

In some embodiments, step 610 is also applicable to the above-mentioned embodiments shown in FIG. 4 and FIG. 5 .

Step 620: The access layer sends the first information to the higher layer according to the reporting cycle, or the access layer sends the first information to the higher layer according to the first trigger event; wherein the first information includes the first PLMN list and the second PLMN list, or, The first information includes a third PLMN list. The first PLMN list includes the identity of at least one PLMN whose signal quality is greater than the threshold value. The second PLMN list includes the identity of at least one PLMN whose signal quality is less than the threshold value. The third PLMN list includes Identities of all PLMNs searched by the access layer.

In some embodiments, the reporting period is indicated by the higher layer to the access layer, or is agreed upon by the protocol, or is a background scanning period, or is configured in the USIM of the terminal device.

In some embodiments, the first triggering event includes at least one of the following: the first PLMN list changes, cell reselection occurs on the terminal device, and the terminal device loses network coverage.

Step 630: If the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list, the higher layer selects the target PLMN in the first PLMN list; or if the first information does not include the first PLMN list or the first PLMN list. There is no PLMN that meets the condition in a PLMN list, and the first information includes the second PLMN list, then the higher layer selects the target PLMN in the second PLMN list; or, if the first information includes the third PLMN list, the higher layer selects the target PLMN in the third PLMN list. Select the target PLMN from the PLMN list.

In some embodiments, the PLMNs that meet the above conditions include at least one of the following: HPLMN, EHPLMN.

In some embodiments, if the first information includes the first PLMN list and there are PLMNs that meet the conditions in the first PLMN list, the higher layer selects the PLMN with the highest priority among the PLMNs that meet the conditions in the first PLMN list as the target PLMN. Among them, the PLMN priority determination method may be the method introduced above, or other methods, which is not limited in this application.

In some embodiments, if the first information does not include the first PLMN list or there is no PLMN that meets the conditions in the first PLMN list, the higher layer selects the PLMN with the best signal quality and that meets the conditions in the second PLMN list as the Target PLMN.

In some embodiments, if the first information does not include the first PLMN list or there is no PLMN that meets the conditions in the first PLMN list, the higher layer selects the PLMN with the best signal quality and that meets the conditions in the third PLMN list as the Target PLMN.

For example, the PLMNs searched by the access layer include PLMN1, PLMN2, PLMN3, PLMN4 and PLMN5.

For example, the signal quality of PLMN1, PLMN2 and PLMN3 searched by the access layer is greater than the threshold value, and the signal quality of PLMN4 and PLMN5 is less than the threshold value. Then the first PLMN list includes the IDs of PLMN1, PLMN2 and PLMN3, the second PLMN list includes the IDs of PLMN4 and PLMN5 and the signal qualities corresponding to these two PLMNs respectively, and the third PLMN list includes the IDs of PLMN1, PLMN2, PLMN3, PLMN4 and PLMN5. ID and the signal quality corresponding to these five PLMNs.

For example, the access layer searches for available PLMNs according to the search period indicated by the higher layer (or agreed by the protocol, or the background scanning period, or configured in the USIM of the terminal device), and then searches for available PLMNs according to the search period indicated by the higher layer (or agreed by the protocol). (or the background scanning cycle, or the reporting cycle configured in the USIM of the terminal device) to send the first information to the upper layer. The first information includes a first PLMN list and a second PLMN list, or the first information includes a third PLMN list. When the first information includes the first PLMN list and the second PLMN list, if PLMN1, PLMN2 and PLMN3 contain HPLMN or EHPLMN, the higher layer selects the highest priority among the HPLMN and/or EHPLMN included in the first PLMN list. PLMN as the target PLMN. If PLMN1, PLMN2 and PLMN3 are not HPLMN or EHPLMN, the higher layer selects the PLMN with the best signal quality among the HPLMN and/or EHPLMN included in the second PLMN list as the target PLMN. When the first information includes the third PLMN list, the higher layer selects the PLMN with the best signal quality among the HPLMNs and/or EHPLMNs included in the third PLMN list as the target PLMN.

For example, the access layer performs a reselection process when the terminal device undergoes cell reselection (or the terminal device loses network coverage, or the terminal device is turned on, or the terminal device exits the power saving mode, or the terminal device's discontinuous reception paging transmission window is reached). or upon arrival), search for available PLMNs, and send the first information to the higher layer when the first PLMN list changes (or cell reselection occurs on the terminal device, or the terminal device loses network coverage). The first information includes a first PLMN list and a second PLMN list, or the first information includes a third PLMN list. When the first information includes the first PLMN list and the second PLMN list, if PLMN1, PLMN2 and PLMN3 contain HPLMN or EHPLMN, the higher layer selects the highest priority among the HPLMN and/or EHPLMN included in the first PLMN list. PLMN as the target PLMN. If PLMN1, PLMN2 and PLMN3 are not HPLMN or EHPLMN, the higher layer selects the PLMN with the best signal quality among the HPLMN and/or EHPLMN included in the second PLMN list as the target PLMN. When the first information includes the third PLMN list, the higher layer selects the PLMN with the best signal quality among the HPLMNs and/or EHPLMNs included in the third PLMN list as the target PLMN.

In the technical solution provided by this embodiment, the access layer searches for PLMN according to the search cycle or the second trigger event, and reports the first information to the higher layer according to the reporting period or the first trigger event, thereby realizing periodic updating of PLMN information in the higher layer. , the PLMN can be reselected periodically. When the first trigger event and the second trigger event occur, the PLMN can also be reselected in time, so that the signal quality of the PLMN is dynamically guaranteed and the user communication quality is improved.

The following are device embodiments of the present application, which can be used to execute method embodiments of the present application. For details not disclosed in the device embodiments of this application, please refer to the method embodiments of this application.

Please refer to FIG. 7 , which shows a block diagram of a network selection device provided by an embodiment of the present application. The device has the function of implementing the above method example, and the function can be implemented by hardware, or can also be implemented by hardware executing corresponding software. The device may be the terminal equipment introduced above, or may be provided in the terminal equipment; wherein the terminal equipment includes an access layer and a high layer. As shown in Figure 7, the device 700 includes: a first sending module 710.

The first sending module 710 is configured to send first information to the higher layer through the access layer, where the first information is used to indicate a PLMN whose signal quality is greater than a threshold.

In some embodiments, when the access layer searches for a PLMN whose signal quality is greater than a threshold, the first information includes: a first PLMN list and a second PLMN list; the first PLMN The list includes the identity of at least one PLMN whose signal quality is greater than the threshold value; the second PLMN list includes the identity of at least one PLMN whose signal quality is less than the threshold value.

In some embodiments, if the access layer does not search for a PLMN whose signal quality is greater than a threshold, the first information includes the second PLMN list.

In some embodiments, please refer to FIG. 8 , the device 700 further includes: a first selection module 720 or a second selection module 730 .

The first selection module 720 is configured to select a target in the first PLMN list through the higher layer if the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list. PLMN.

The second selection module 730 is configured to select, through the higher layer, the second PLMN list through the higher layer if the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list. Select the target PLMN.

In some embodiments, please refer to Figure 8. The device 700 further includes: a first request module 740, configured to send a first request to the access layer through the higher layer, where the first request is used to request the access layer. The access layer reports available PLMNs.

In some embodiments, when the access layer searches for a PLMN whose signal quality is greater than a threshold value, the first information includes: a first PLMN list; the first PLMN list includes at least one of the An identification of a PLMN whose signal quality is greater than the threshold value.

In some embodiments, when the access layer does not search for a PLMN with a signal quality greater than a threshold, the first information is used to indicate that a PLMN with a signal quality greater than the threshold is not found. .

In some embodiments, please refer to Figure 8. The device 700 further includes: a second request module 750, configured to send a second request to the access layer through the higher layer, where the second request is used to request the access layer. The access layer reports the PLMN whose signal quality is greater than a threshold value.

In some embodiments, please refer to FIG. 8 , the device 700 further includes: a first selection module 720 or a third request module 760 .

The first selection module 720 is configured to select a target in the first PLMN list through the higher layer if the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list. PLMN.

The third request module 760 is configured to send the third request module 760 to the access layer through the higher layer if the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list. Three requests, the third request is used to request the access layer to report the PLMN whose signal quality is less than a threshold value.

In some embodiments, please refer to Figure 8. The device further includes: a second sending module 770, configured to send second information to the higher layer through the access layer, where the second information is used to indicate the PLMN whose signal quality is less than the threshold value.

In some embodiments, the second information includes: a second PLMN list or a third PLMN list; wherein the second PLMN list includes an identification of at least one PLMN whose signal quality is less than the threshold value, so The third PLMN list includes the identities of all PLMNs searched by the access layer.

In some embodiments, please refer to FIG. 8 , the device 700 further includes: a second selection module 730 or a third selection module 780 .

The second selection module 730 is configured to select a target PLMN in the second PLMN list through the higher layer if the second information includes the second PLMN list.

The third selection module 780 is configured to select a target PLMN in the third PLMN list through the higher layer if the second information includes the third PLMN list.

In some embodiments, the first information includes a first PLMN list and a second PLMN list, or the first information includes a third PLMN list;

The first PLMN list includes the identification of at least one PLMN whose signal quality is greater than the threshold value;

The second PLMN list includes the identification of at least one PLMN whose signal quality is less than the threshold value;

The third PLMN list includes the identities of all PLMNs searched by the access layer.

In some embodiments, the first sending module 710 is configured to send the first information to the higher layer through the access layer according to the reporting cycle;

Alternatively, the first sending module 710 is configured to send the first information to the higher layer through the access layer according to a first triggering event.

In some embodiments, the reporting period is indicated by the higher layer to the access layer, or agreed upon by a protocol, or a background scanning period, or configured in the USIM of the terminal device.

In some embodiments, the first triggering event includes at least one of the following:

The first PLMN list changes;

Cell reselection occurs on the terminal equipment;

The terminal device loses network coverage.

In some embodiments, the device 700 further includes a search module (not shown in the figure) for:

Search available PLMNs according to the search cycle through the access layer;

or,

The access layer searches for available PLMNs according to the second triggering event.

In some embodiments, the search period is indicated by the higher layer to the access layer, or agreed upon by a protocol, or a background scanning period, or configured in the USIM of the terminal device.

In some embodiments, the second triggering event includes at least one of the following:

Cell reselection occurs on the terminal equipment;

The terminal device loses network coverage;

The terminal device is powered on;

The terminal device exits the power saving mode;

Before or when the paging transmission window for discontinuous reception of the terminal device arrives.

In some embodiments, please refer to FIG. 8 , the device 700 further includes: a first selection module 720, or a second selection module 730, or a third selection module 780.

The first selection module 720 is configured to select a target in the first PLMN list through the higher layer if the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list. PLMN.

The second selection module 730 is used if the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list, and the first information includes the second PLMN list. , then the target PLMN is selected in the second PLMN list through the higher layer.

The third selection module 780 is configured to select a target PLMN in the third PLMN list through the higher layer if the first information includes the third PLMN list.

In some embodiments, the first selection module 720 is configured to select, through the higher layer, the PLMN with the highest priority as the target PLMN among the PLMNs that meet the conditions in the first PLMN list. PLMN includes at least one of the following: HPLMN, EHPLMN.

In some embodiments, the second selection module 730 is configured to select, through the higher layer, a PLMN with the best signal quality and satisfying a condition in the second PLMN list as the target PLMN. The PLMN includes at least one of the following: HPLMN, EHPLMN.

In some embodiments, the third selection module 780 is configured to select, through the higher layer, a PLMN with the best signal quality in the third PLMN list and that satisfies a condition as the target PLMN. The PLMN includes at least one of the following: HPLMN, EHPLMN.

In some embodiments, the second PLMN list further includes: signal quality corresponding to each PLMN included in the second PLMN list.

In some embodiments, the third PLMN list further includes: signal quality corresponding to each PLMN included in the third PLMN list.

In some embodiments, the apparatus 700 further includes: a threshold value indication module (not shown in the figure), configured to indicate the threshold value provided by the operator to the access layer through the higher layer.

In some embodiments, the threshold value is configured in the USIM of the terminal device.

In some embodiments, the higher layer is a non-access layer.

It should be noted that when the device provided in the above embodiment implements its functions, only the division of the above functional modules is used as an example. In practical applications, the above function allocation can be completed by different functional modules according to actual needs, that is, The content structure of the device is divided into different functional modules to complete all or part of the functions described above.

Regarding the devices in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

Please refer to FIG. 9 , which shows a schematic structural diagram of a terminal device provided by an embodiment of the present application. The terminal device 900 may include: a processor 901, a transceiver 902, and a memory 903.

The processor 901 includes one or more processing cores. The processor 901 executes various functional applications and information processing by running software programs and modules.

The transceiver 902 may include a receiver and a transmitter. For example, the receiver and the transmitter may be implemented as the same wireless communication component, and the wireless communication component may include a wireless communication chip and a radio frequency antenna.

Memory 903 may be connected to processor 901 and transceiver 902.

The memory 903 can be used to store a computer program executed by the processor, and the processor 901 is used to execute the computer program to implement various steps executed by the terminal device in the above method embodiment.

Additionally, memory 903 may be implemented by any type of volatile or non-volatile storage device, or combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable Read-only memory, erasable programmable read-only memory, static ready-access memory, read-only memory, magnetic memory, flash memory, programmable read-only memory.

In some embodiments, the terminal device includes an access layer and a higher layer, and the processor 901 is configured to send first information to the upper layer through the access layer, where the first information is used to indicate that the signal quality is greater than PLMN of threshold value.

For details that are not described in detail in this embodiment, please refer to the above embodiments and will not be described again here.

Embodiments of the present application also provide a computer-readable storage medium. A computer program is stored in the storage medium. The computer program is used to be executed by a processor of a terminal device to implement the above network selection method.

Optionally, the computer-readable storage medium may include: ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives, solid state drive) or optical disk, etc. Among them, random access memory can include ReRAM (Resistance Random Access Memory, resistive random access memory) and DRAM (Dynamic Random Access Memory, dynamic random access memory).

Embodiments of the present application also provide a chip, which includes programmable logic circuits and/or program instructions, and is used to implement the above network selection method when the chip is run on a terminal device.

Embodiments of the present application also provide a computer program product. The computer program product includes computer instructions. The computer instructions are stored in a computer-readable storage medium. The processor of the terminal device reads from the computer-readable storage medium. and execute the computer instructions to implement the above network selection method.

It should be understood that the "instruction" mentioned in the embodiments of this application may be a direct instruction, an indirect instruction, or an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B. relation.

In the description of the embodiments of this application, the term "correspondence" can mean that there is a direct correspondence or indirect correspondence between the two, it can also mean that there is an associated relationship between the two, or it can mean indicating and being instructed, configuration and being. Configuration and other relationships.

In some embodiments of this application, "predefined" can be realized by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices). This application is for Its specific implementation method is not limited. For example, predefined can refer to what is defined in the protocol.

In some embodiments of this application, the "protocol" may refer to a standard protocol in the communication field, which may include, for example, LTE protocol, NR protocol, and related protocols applied in future communication systems. This application is not limited to this.

The "plurality" mentioned in this article means two or more than two. "And/or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the related objects are in an "or" relationship.

In addition, the step numbers described in this article only illustrate a possible execution sequence between the steps. In some other embodiments, the above steps may not be executed in the numbering sequence, such as two different numbers. The steps are executed simultaneously, or two steps with different numbers are executed in the reverse order as shown in the figure, which is not limited in the embodiments of the present application.

In addition, the embodiments provided herein can be combined arbitrarily to form new embodiments, which are all within the protection scope of this application.

Those skilled in the art should realize that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Storage media can be any available media that can be accessed by a general purpose or special purpose computer.

The above are only exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (60)

A network selection method, characterized in that the method is executed by a terminal device, the terminal device includes an access layer and a high layer, and the method includes: The access layer sends first information to the higher layer, where the first information is used to indicate a public land mobile network PLMN whose signal quality is greater than a threshold value. The method according to claim 1, characterized in that, when the access layer searches for a PLMN whose signal quality is greater than a threshold, the first information includes: a first PLMN list and a second PLMN list; The first PLMN list includes the identification of at least one PLMN whose signal quality is greater than the threshold value; The second PLMN list includes an identification of at least one PLMN whose signal quality is less than the threshold value. The method according to claim 2, characterized in that, when the access layer does not search for a PLMN whose signal quality is greater than a threshold, the first information includes the second PLMN list. The method according to claim 2 or 3, characterized in that after the access layer sends the first information to the higher layer, it further includes: If the first information includes the first PLMN list and there is a PLMN that meets the condition in the first PLMN list, the higher layer selects the target PLMN in the first PLMN list; or, If the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list, the higher layer selects a target PLMN in the second PLMN list. The method according to any one of claims 2 to 4, characterized in that before the access layer sends the first information to the higher layer, it further includes: The higher layer sends a first request to the access layer, where the first request is used to request the access layer to report available PLMNs. The method according to claim 1, characterized in that, when the access layer searches for a PLMN whose signal quality is greater than a threshold value, the first information includes: a first PLMN list; The first PLMN list includes an identification of at least one PLMN whose signal quality is greater than the threshold value. The method according to claim 6, characterized in that, when the access layer does not search for a PLMN whose signal quality is greater than a threshold value, the first information is used to indicate that the signal is not searched. PLMNs whose quality is greater than the threshold. The method according to claim 6 or 7, characterized in that before the access layer sends the first information to the higher layer, it further includes: The higher layer sends a second request to the access layer, where the second request is used to request the access layer to report a PLMN whose signal quality is greater than a threshold. The method according to any one of claims 6 to 8, characterized in that after the access layer sends the first information to the higher layer, it further includes: If the first information includes the first PLMN list and there is a PLMN that meets the condition in the first PLMN list, the higher layer selects the target PLMN in the first PLMN list; or, If the first information does not include the first PLMN list or there is no PLMN that meets the conditions in the first PLMN list, the higher layer sends a third request to the access layer, and the third request is Requesting the access layer to report the PLMN whose signal quality is less than a threshold value. The method according to claim 9, characterized in that after the higher layer sends the third request to the access layer, it further includes: The access layer sends second information to the higher layer, where the second information is used to indicate the PLMN whose signal quality is less than a threshold value. The method according to claim 10, characterized in that the second information includes: a second PLMN list, the second PLMN list including an identification of at least one PLMN whose signal quality is less than the threshold value; or, A third PLMN list includes the identities of all PLMNs searched by the access layer. The method according to claim 11, characterized in that after the access layer sends the second information to the higher layer, it further includes: If the second information includes the second PLMN list, the higher layer selects the target PLMN in the second PLMN list; or, If the second information includes the third PLMN list, the higher layer selects a target PLMN in the third PLMN list. The method according to claim 1, wherein the first information includes a first PLMN list and a second PLMN list, or the first information includes a third PLMN list; The first PLMN list includes the identification of at least one PLMN whose signal quality is greater than the threshold value; The second PLMN list includes the identification of at least one PLMN whose signal quality is less than the threshold value; The third PLMN list includes the identities of all PLMNs searched by the access layer. The method according to claim 13, characterized in that the access layer sends the first information to the higher layer, including: The access layer sends the first information to the higher layer according to a reporting cycle; or, The access layer sends the first information to the higher layer according to a first triggering event. The method according to claim 14, characterized in that the reporting period is indicated by the higher layer to the access layer, or agreed upon by a protocol, or a background scanning period, or a universal user identification of the terminal device. Configured in module USIM. The method according to claim 14 or 15, characterized in that the first triggering event includes at least one of the following: The first PLMN list changes; Cell reselection occurs on the terminal equipment; The terminal device loses network coverage. The method according to any one of claims 13 to 16, characterized in that the method further includes: The access layer searches for available PLMNs according to the search cycle; or, The access layer searches for available PLMNs according to the second triggering event. The method according to claim 17, characterized in that the search period is indicated by the higher layer to the access layer, or agreed upon by the protocol, or a background scanning period, or configured in the USIM of the terminal device. of. The method according to claim 17 or 18, characterized in that the second triggering event includes at least one of the following: Cell reselection occurs on the terminal equipment; The terminal device loses network coverage; The terminal device is powered on; The terminal device exits the power saving mode; Before or when the paging transmission window for discontinuous reception of the terminal device arrives. The method according to any one of claims 13 to 19, characterized in that after the access layer sends the first information to the higher layer, it further includes: If the first information includes the first PLMN list and there is a PLMN that meets the condition in the first PLMN list, the higher layer selects the target PLMN in the first PLMN list; or, If the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list, and the first information includes the second PLMN list, then the higher layer will Select the target PLMN in the second PLMN list; or, If the first information includes the third PLMN list, the higher layer selects a target PLMN in the third PLMN list. The method according to any one of claims 4, 9 and 20, characterized in that the higher layer selects a target PLMN in the first PLMN list, including: The higher layer selects the PLMN with the highest priority as the target PLMN among the PLMNs that meet the conditions in the first PLMN list, and the PLMNs that meet the conditions include at least one of the following: Home Public Land Mobile Network HPLMN, Equivalent Home Public Land Mobile Network EHPLMN. The method according to any one of claims 4, 12 and 20, characterized in that the higher layer selects a target PLMN in the second PLMN list, including: The higher layer selects the PLMN with the best signal quality and meeting the conditions in the second PLMN list as the target PLMN. The PLMN meeting the conditions includes at least one of the following: HPLMN and EHPLMN. The method according to claim 12 or 20, characterized in that the higher layer selects a target PLMN in the third PLMN list, including: The higher layer selects the PLMN with the best signal quality and meeting the conditions in the third PLMN list as the target PLMN, and the PLMN meeting the conditions includes at least one of the following: HPLMN, EHPLMN. The method according to any one of claims 2 to 5 and 11 to 20, wherein the second PLMN list further includes: signal quality corresponding to each PLMN included in the second PLMN list. The method according to any one of claims 11 to 20, wherein the third PLMN list further includes: signal quality corresponding to each PLMN included in the third PLMN list. The method according to any one of claims 1 to 25, characterized in that the method further includes: The upper layer indicates the threshold value provided by the operator to the access layer. The method according to any one of claims 1 to 26, characterized in that the threshold value is configured in the USIM of the terminal device. The method according to any one of claims 1 to 27, characterized in that the higher layer is a non-access layer. A network selection device, characterized in that the device is provided in a terminal equipment, the terminal equipment includes an access layer and a high layer, and the device includes: The first sending module is configured to send first information to the higher layer through the access layer, where the first information is used to indicate a public land mobile network PLMN whose signal quality is greater than a threshold value. The apparatus according to claim 29, characterized in that, when the access layer searches for a PLMN whose signal quality is greater than a threshold, the first information includes: a first PLMN list and a second PLMN list; The first PLMN list includes the identification of at least one PLMN whose signal quality is greater than the threshold value; The second PLMN list includes an identification of at least one PLMN whose signal quality is less than the threshold value. The apparatus according to claim 29, wherein when the access layer does not search for a PLMN whose signal quality is greater than a threshold, the first information includes the second PLMN list. The device according to claim 30 or 31, characterized in that the device further includes: A first selection module configured to select a target PLMN in the first PLMN list through the higher layer if the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list. ; or, A second selection module configured to select from the second PLMN list through the higher layer if the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list. Target PLMN. The device according to any one of claims 30 to 32, characterized in that the device further includes: A first request module, configured to send a first request to the access layer through the higher layer, where the first request is used to request the access layer to report available PLMNs. The device according to claim 29, wherein when the access layer searches for a PLMN whose signal quality is greater than a threshold, the first information includes: a first PLMN list; The first PLMN list includes an identification of at least one PLMN whose signal quality is greater than the threshold value. The apparatus according to claim 34, wherein when the access layer does not search for a PLMN whose signal quality is greater than a threshold value, the first information is used to indicate that the signal is not found. PLMNs whose quality is greater than the threshold. The device according to claim 34 or 35, characterized in that the device further includes: A second request module is configured to send a second request to the access layer through the higher layer, where the second request is used to request the access layer to report a PLMN whose signal quality is greater than a threshold value. The device according to any one of claims 34 to 36, characterized in that the device further includes: A first selection module configured to select a target PLMN in the first PLMN list through the higher layer if the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list. ; or, A third request module, configured to send a third request module to the access layer through the higher layer if the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list. request, the third request is used to request the access layer to report a PLMN whose signal quality is less than a threshold value. The device of claim 37, further comprising: The second sending module is configured to send second information to the higher layer through the access layer, where the second information is used to indicate a PLMN whose signal quality is less than a threshold value. The device according to claim 38, characterized in that the second information includes: a second PLMN list, the second PLMN list including an identification of at least one PLMN whose signal quality is less than the threshold value; or, A third PLMN list includes the identities of all PLMNs searched by the access layer. The device of claim 39, further comprising: A second selection module, configured to select a target PLMN in the second PLMN list through the higher layer if the second information includes the second PLMN list; or, A third selection module, configured to select a target PLMN in the third PLMN list through the higher layer if the second information includes the third PLMN list. The device according to claim 29, wherein the first information includes a first PLMN list and a second PLMN list, or the first information includes a third PLMN list; The first PLMN list includes the identification of at least one PLMN whose signal quality is greater than the threshold value; The second PLMN list includes the identification of at least one PLMN whose signal quality is less than the threshold value; The third PLMN list includes the identities of all PLMNs searched by the access layer. The device according to claim 41, characterized in that: The first sending module is configured to send the first information to the higher layer according to the reporting cycle through the access layer; or, The first sending module is configured to send the first information to the higher layer through the access layer according to a first triggering event. The device according to claim 42, characterized in that the reporting period is indicated by the higher layer to the access layer, or agreed upon by a protocol, or a background scanning period, or a universal user identification of the terminal device. Configured in module USIM. The device according to claim 42 or 43, characterized in that the first triggering event includes at least one of the following: The first PLMN list changes; Cell reselection occurs on the terminal equipment; The terminal device loses network coverage. The device according to any one of claims 41 to 44, characterized in that the device further includes a search module for: Search available PLMNs according to the search cycle through the access layer; or, The access layer searches for available PLMNs according to the second triggering event. The device according to claim 45, characterized in that the search period is indicated by the higher layer to the access layer, or agreed upon by the protocol, or a background scanning period, or configured in the USIM of the terminal device. of. The device according to claim 45 or 46, characterized in that the second triggering event includes at least one of the following: Cell reselection occurs on the terminal equipment; The terminal device loses network coverage; The terminal device is powered on; The terminal device exits the power saving mode; Before or when the paging transmission window for discontinuous reception of the terminal device arrives. The device according to any one of claims 41 to 47, characterized in that the device further includes: A first selection module configured to select a target PLMN in the first PLMN list through the higher layer if the first information includes the first PLMN list and there is a PLMN that meets the conditions in the first PLMN list. ; or, A second selection module, configured to: if the first information does not include the first PLMN list or there is no PLMN that meets the condition in the first PLMN list, and the first information includes the second PLMN list, Then select the target PLMN in the second PLMN list through the higher layer; or, A third selection module, configured to select a target PLMN in the third PLMN list through the higher layer if the first information includes the third PLMN list. The device according to any one of claims 32, 37 and 48, characterized in that, The first selection module is configured to select, through the higher layer, the PLMN with the highest priority as the target PLMN among the PLMNs that meet the conditions in the first PLMN list, and the PLMNs that meet the conditions include at least one of the following: Home public land mobile network HPLMN, equivalent home public land mobile network EHPLMN. The device according to any one of claims 32, 40 and 48, characterized in that, The second selection module is configured to select, through the higher layer, a PLMN with the best signal quality and satisfying conditions in the second PLMN list as the target PLMN. The PLMNs meeting conditions include at least one of the following: : HPLMN, EHPLMN. The device according to claim 40 or 48, characterized in that the device includes: The third selection module is configured to select, through the higher layer, the PLMN with the best signal quality and that meets the conditions in the third PLMN list as the target PLMN. The PLMN that meets the conditions includes at least one of the following: : HPLMN, EHPLMN. The device according to any one of claims 30 to 33 and 39 to 48, wherein the second PLMN list further includes: signal quality respectively corresponding to each PLMN included in the second PLMN list. The device according to any one of claims 39 to 48, wherein the third PLMN list further includes: signal quality corresponding to each PLMN included in the third PLMN list. The device according to any one of claims 29 to 53, characterized in that the device further includes: A threshold value indication module is configured to indicate the threshold value provided by the operator to the access layer through the higher layer. The apparatus according to any one of claims 29 to 54, characterized in that the threshold value is configured in the USIM of the terminal device. The device according to any one of claims 29 to 55, characterized in that the higher layer is a non-access layer. A terminal device, characterized in that the terminal device includes a processor and a memory, a computer program is stored in the memory, and the processor executes the computer program to implement the method described in any one of claims 1 to 28 Methods. A computer-readable storage medium, characterized in that a computer program is stored in the storage medium, and the computer program is used to be executed by a processor to implement the method according to any one of claims 1 to 28. A chip, characterized in that the chip includes programmable logic circuits and/or program instructions, which are used to implement the method according to any one of claims 1 to 28 when the chip is run. A computer program product, characterized in that the computer program product includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and a processor reads and executes the computer instructions from the computer-readable storage medium , to implement the method according to any one of claims 1 to 28.

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