CN113423125A

CN113423125A - Method and device for cell reselection, handover or background search

Info

Publication number: CN113423125A
Application number: CN202110592733.9A
Authority: CN
Inventors: 徐自翔; 智钢; 丁明
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-09-21
Anticipated expiration: 2041-05-28
Also published as: CN113423125B

Abstract

The embodiment of the application provides a method and a device for cell reselection, handover or background search, relates to the field of terminals, can realize the functions of cell reselection, handover and background search among different systems of cross operators, and can avoid the problems of network drop and power consumption caused by frequent registration refusal in the prior art, thereby improving the user experience. The method comprises the following steps: the terminal equipment roams a first cell under a first network standard (for example, 4G) of a first operator (for example, China Mobile); when the terminal device performs inter-system cell reselection, handover or background search, the PLMN of the home operator (e.g., china radio and television) may be used as the EPLMN, so that the terminal device may reside in a second cell of the home operator in a second network standard (e.g., 5G). The method and the device are applied to scenes of inter-system cell reselection, handover or background search.

Description

Method and device for cell reselection, handover or background search

Technical Field

The present application relates to the field of terminals, and in particular, to a method and an apparatus for cell reselection, handover, or background search.

Background

In the fifth generation (5)^th generation，5G) In the mobile communication system, the cost of operators for building base stations is greatly increased. The same coverage, the number of 5G base stations required is fourth generation (4)^thgeneration, 4G) 3-4 times of the mobile communication system. In order to reduce the cost, a commonly adopted network deployment mode is to establish a shared 5G base station among multiple operators. For example, in a domestic operator, chinese telecommunications (may be referred to as telecommunications for short) and chinese unicom (may be referred to as unicom) may jointly construct a 5G independent networking (SA) base station, and chinese radio and television (may be referred to as radio and television for short) and chinese mobile (may be referred to as mobile for short) may jointly construct a 5G SA base station, so that the 5G networking cost may be effectively reduced.

Besides the co-construction and sharing of base stations, allowing domestic roaming among operators is also an important means for reducing the network construction cost. For example, broadcasting and television can rent mobile 4G base stations, and broadcasting and television users can register a 4G network of china mobile in a roaming manner.

However, in the above scenario, an anomaly may occur when the radio and television subscriber reselects/switches the inter-4G/5G inter-system. For example, when a radio and television user registers in a 4G network of a china mobile in a roaming manner, when the radio and television user moves to a 5G network shared by the china mobile and the radio and television, it is necessary to select a cell in which a Public Land Mobile Network (PLMN) is the same as an Equivalent PLMN (EPLMN) (or a registered PLMN (registered PLMN)) for registration when performing cell reselection in the shared network according to a protocol (see TS 23.122). Since the EPLMN (or RPLMN) stored by the radio and television subscriber is 46000, mobility registration is still initiated on 46000, and the 5G network moved in china does not allow the radio and television subscriber to access in a roaming manner, so that the radio and television subscriber is disconnected. In addition, the broadcasting and television users have similar problems when carrying out inter-4G/5G inter-system cell handover and background search.

Disclosure of Invention

The embodiment of the application provides a method and a device for cell reselection, handover or background search, which can realize the cell reselection, handover and background search functions among different systems of operators.

In a first aspect, an embodiment of the present application provides a method for cell reselection, handover, or background search, including: a terminal device resides in a first cell under a first Radio Access Technology (RAT); the first cell corresponds to a first PLMN, and the first PLMN is not a home public land mobile network (Home PLMN, HPLMN) of the terminal equipment; if the terminal equipment meets the preset condition, the terminal equipment resides in a second cell under a second RAT, and the second RAT is different from the first RAT; the second cell corresponds to a first supplementary (to be Supplemented) Equivalent Public Land Mobile Network (SEPLMN), the first SEPLMN is set to be the EPLMN under the second RAT, and the first SEPLMN is the HPLMN of the terminal device.

Based on the method provided by the embodiment of the application, the terminal equipment can realize the functions of cell reselection, handover and background search among different systems crossing PLMN from operators. For example, in the prior art, a broadcast subscriber roaming in a mobile 4G cell (a first cell under a first RAT) selects a mobile 5G cell to camp on. However, since the china mobile does not support the 5G roaming of the radio and television user, when the radio and television user selects the mobile 5G cell to reside, the cell reselection from the 4G network to the 5G network cannot be realized, which results in the problems of network drop and power consumption, and the user experience is poor. In the embodiment of the application, for a scenario that a broadcast and television user moves from a china mobile 4G network to a broadcast and television 5G network, a first sepplmn may be set as an EPLMN, and the first sepplmn is an HPLMN (e.g., 46015) of a terminal device. In this way, the terminal device may select the broadcast television 5G cell (the second cell, i.e., the 5G cell with the PLMN 46015) to camp on. The method provided by the embodiment of the application can avoid the problems of network drop and power consumption caused by frequent registration refusal in the prior art, thereby improving the user experience.

In a possible implementation manner, the terminal device satisfying the preset condition includes that the terminal device satisfies a condition for performing inter-system cell reselection, handover, or background search. For example, when the terminal device receives the inter-system neighbor cell measurement information broadcast by the network device (e.g., the base station) in the idle state, the terminal device may start the inter-system neighbor cell measurement, and determine the signal quality of the inter-system neighbor cell, so as to initiate cell reselection subsequently. When the terminal equipment is in a connected state, and the signal intensity of the serving cell is lower than a preset threshold, the terminal equipment can perform inter-system cell switching. The terminal device can actively initiate high-priority RAT (radio access technology) neighbor cell measurement according to a preset rule in an idle state.

In one possible implementation, the second cell satisfies at least one of: the network type corresponding to the second cell is higher than that of the first cell; the reselection priority corresponding to the second cell is higher than that of the first cell; the load of the second cell is smaller than that of the first cell; the second cell has a higher signal quality than the first cell.

In one possible implementation, the method further includes: and the terminal equipment loads the configuration information of the card following, wherein the configuration information of the card following is used for indicating that the EPLMN of the terminal equipment under the second RAT comprises the first SEPLMN. The UE may supplement (add) the first SEPLMN to the EPLMN list in the second RAT.

In a possible implementation manner, the card following configuration information is further used to indicate that the EPLMN of the terminal device in the second RAT does not include a first deleted (to-be-deleted) EPLMN (cepmn), and the first cepmn includes the first PLMN and includes an Equivalent Home Public Land Mobile Network (EHPLMN) of the first PLMN. The UE may delete the first ceplm from the EPLMN list in the second RAT.

In one possible implementation, the card configuration information is stored in non-volatile memory (NV) in the terminal device.

In one possible implementation, the first RAT is long term evolution, LTE, and the second RAT is a new radio, NR; or the first RAT is NR and the second RAT is LTE. That is, the embodiment of the present application may support inter-system cell reselection, handover, or background search from 4G to 5G or from 5G to 4G across operators, so as to ensure that the terminal device may successfully access a new cell.

In one possible implementation, the first PLMN includes 46000, 46002, 46004, 46007, or 46008, and the second PLMN includes 46015.

In one possible implementation, the method further includes: and the non-access layer of the terminal equipment adds the first SEPLMN to the EPLMN list to obtain an updated EPLMN list, and sends the updated EPLMN list to the access layer of the terminal equipment. It should be noted that the non-access stratum still stores an unmodified EPLMN list, which is used for functions of PLMN selection and roaming condition determination of the NAS layer.

In one possible implementation manner, in a case where the terminal device is camped on the second cell, the method further includes: if the terminal equipment meets the preset condition, the terminal equipment resides in a third cell under the first RAT; the third cell corresponds to a second SEPLMN, the second SEPLMN is set to be the EPLMN under the first RAT, and the second SEPLMN is a PLMN which the terminal device is allowed to camp on under the first RAT.

For example, in this embodiment of the application, for a scenario where a broadcast and television user moves from a broadcast and television 5G network to a mobile 4G network, a second sepplmn (PLMN corresponding to the mobile (e.g., 46000)) may be set as the EPLMN. In this way, the terminal device may select a mobile 4G cell (the third cell, i.e., the 4G cell with the PLMN 46000) to camp on. The method provided by the embodiment of the application can avoid the problems of network drop and power consumption caused by frequent registration refusal in the prior art, thereby improving the user experience.

In a second aspect, an embodiment of the present application provides a terminal device, including: a communication unit configured to camp on a first cell under a first radio access technology, RAT; the first cell corresponds to a first PLMN, and the first PLMN is not the HPLMN of the terminal equipment; the communication unit is further configured to camp on a second cell under a second RAT if a preset condition is met, where the second RAT is different from the first RAT; the second cell corresponds to a first SEPLMN, the first SEPLMN is set to be an EPLMN under a second RAT, and the first SEPLMN is an HPLMN of the terminal equipment.

In a possible implementation manner, the terminal device satisfying the preset condition includes that the terminal device satisfies a condition for performing inter-system cell reselection, handover, or background search.

In a possible implementation manner, the system further includes a processing unit, configured to: loading configuration information with the card, wherein the configuration information with the card is used for indicating that the EPLMN of the terminal equipment under the second RAT comprises the first SEPLMN.

In a possible implementation manner, the card configuration information is further used to indicate that the EPLMN of the terminal device in the second RAT does not include the first cepmn, and the first cepmn includes the first PLMN and includes the EHPLMN of the first PLMN.

In a possible implementation, the card configuration information is stored in a non-volatile memory NV in the terminal device.

In one possible implementation, the first RAT is long term evolution, LTE, and the second RAT is a new radio, NR; or the first RAT is NR and the second RAT is LTE.

In one possible implementation, the first PLMN includes 46000, 46002, 46004, 46007, or 46008; the second PLMN includes 46015.

In one possible implementation, the processing unit is configured to: and adding the first SEPLMN to the EPLMN list through the non-access layer to obtain an updated EPLMN list, and sending the updated EPLMN list to the access layer.

In a possible implementation manner, in a case where the terminal device is camped on the second cell, the communication unit is further configured to: if the preset condition is met, residing in a third cell under the first RAT; the third cell corresponds to a second SEPLMN, the second SEPLMN is set to be the EPLMN under the first RAT, and the second SEPLMN is a PLMN which the terminal device is allowed to camp on under the first RAT.

In a third aspect, the present application provides a computer-readable storage medium comprising computer instructions. The computer instructions, when executed on a terminal device (such as a mobile phone), cause the terminal device to perform a method as described in the first aspect and any possible implementation thereof.

In a fourth aspect, the present application provides a computer program product which, when run on a computer, causes the computer to perform the method according to the first aspect and any one of its possible implementations.

In a fifth aspect, embodiments of the present application provide a processing apparatus, comprising a processor, a processor coupled with a memory, the memory storing program instructions, and the program instructions stored in the memory, when executed by the processor, cause the apparatus to implement the method according to the first aspect and any possible implementation manner thereof. The apparatus may be a terminal device; or may be an integral part of the terminal device, such as a chip.

In a sixth aspect, embodiments of the present application provide a processing apparatus, which may be divided into different logical units or modules according to functions, and each unit or module performs different functions, so that the apparatus performs the method described in the above first aspect and any possible implementation manner thereof.

In a seventh aspect, an embodiment of the present application provides a communication system, which includes a terminal device and a network device, where the terminal device and the network device respectively perform part of the steps, and cooperate with each other to implement the method described in the first aspect and any possible implementation manner thereof.

In an eighth aspect, an embodiment of the present application provides a chip system, where the chip system includes an Application Processor (AP) for executing an operating system, a user interface, and an application program, and a Baseband Processor (BP) for controlling radio frequency communication, where the BP is used for a first cell residing in a first RAT; the first cell corresponds to a first PLMN, and the first PLMN is not the HPLMN of the terminal equipment; if the preset condition is met, the terminal camps on a second cell under a second RAT, wherein the second RAT is different from the first RAT; the second cell corresponds to a first SEPLMN, the first SEPLMN is set to be an EPLMN under a second RAT, and the first SEPLMN is an HPLMN of the terminal equipment.

In a ninth aspect, the present application provides a chip system that includes one or more interface circuits and one or more processors. The interface circuit and the processor are interconnected by a line.

The above chip system can be applied to a terminal device including a communication module and a memory. The interface circuit is configured to receive signals from the memory of the terminal device and to send the received signals to the processor, the signals including computer instructions stored in the memory. When executed by a processor, the computer instructions may perform a method as described in the first aspect and any one of its possible implementations.

Drawings

Fig. 1 is a schematic diagram of a system architecture according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an electronic device 200 according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of signal interaction for inter-system cell reselection according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a protocol stack according to an embodiment of the present application;

FIG. 5 is a schematic flow chart illustrating an example of updating an EPLMN list according to the present invention;

fig. 6 is a schematic view of a scenario provided in an embodiment of the present application;

fig. 7 is a schematic signal interaction diagram of inter-system cell handover according to an embodiment of the present application;

FIG. 8 is a signal interaction diagram of a high priority background search according to an embodiment of the present application;

fig. 9 is a schematic diagram of a signal interaction provided in an embodiment of the present application;

fig. 10 is a schematic structural diagram of a chip system according to an embodiment of the present disclosure.

Detailed Description

For clarity and conciseness of the following description of the various embodiments, a brief introduction to related concepts or technologies is first presented:

PLMN: is a network established and operated by the government or its approved operator to provide land mobile communication services to the public. The PLMNs are interconnected with the public switched telephone network to form a communications network of regional or national scale.

The PLMN is composed of a Mobile Country Code (MCC) and a mobile network number (MNC). MCC uniquely represents the country of the mobile subscriber. For example, MCC 460 in China. The MNC may uniquely represent the network in that country. For example, the MNC corresponding to china mobile may include 00 and the MNC corresponding to china unicom includes 01. As shown in table 1, different operators may correspond to different PLMNs.

TABLE 1

As shown in table 1, PLMNs of china mobile may include 46000, 46002, 46004, 46007, and 46008; china unicom PLMNs may include 46001, 46006, 46009, and 46010. PLMNs for chinese telecommunications may include 46003, 46011, and 46012; the PLMN for china radio may include 46015. In the future, PLMNs corresponding to the respective operators may also include others, and the present application is not limited herein.

EPLMN: is the PLMN which is in the same position as the currently selected PLMN of the user terminal, and the priority is the same. The EPLMN mainly addresses the user residence and roaming policies of the shared network with the original network. An operator may configure peer-to-peer PLMN networks between which communication network resource sharing may be implemented. From a business perspective, the EPLMN enables communication network resource sharing between network resources of different operators, or between different PLMNs defined by the same operator.

EPLMN List (list): the operator may configure the EPLMN list in the core network equipment. For example, it may be configured in a Mobile Switching Center (MSC) server (server) under 2/3G, a Mobility Management Entity (MME) under 4G, or an access and mobility management function (AMF) network element under 5G. Wherein, the EPLMN list is configured with the peer-to-peer relationship among different PLMNs, so that the PLMNs are in an equal network. Thus, the signed mobile subscriber belonging to the operator can reside between different EPLMNs. In the third generation partnership project (3 GPP) release-5 (release-5, Rel-5) and its previous stages, a list of EPLMNs may be configured with up to 5 EPLMNs. In 3GPP Release-6 (Release-6, Rel-6) and beyond, a maximum of 15 EPLMNs can be configured in an EPLMN list.

The MSCS may issue the EPLMN list to the terminal device via a Location Updating Accept (Location Updating Accept) message. The terminal device can store the EPLMN list issued by the MSCS and the network number of the current network in the SIM card until the list is refreshed after the next position updating is successful. Alternatively, the EPLMN list may be stored in the terminal device at the time of shipment of the terminal device. The end device may refresh the EPLMN list according to the current network.

Equivalent home public land mobile network EHPLMN: since the same operator may include multiple PLMNs, different PLMNs of the same operator are EHPLMNs each other. For example, there are three PLMNs 46000, 46002 and 46007 in china mobile, and 46002 and 46007 are EHPLMNs relative to 46000.

The following describes the operation mode adopted by the Radio Access Network (RAN) shared by all operators.

1) The operators usually only co-establish and share a network under a certain Radio Access Technology (RAT), and the operators still use respective own networks under other systems. For example, telecommunications and communications may be co-established with 4G base stations, but each use a self-established 5G base station under 5G. Broadcast and mobile can build 5G base stations together. And the mobile station uses the self-built 4G base station under 4G.

2) And all base stations are not shared under a certain standard among operators, independent base stations of the operators still exist, and unshared base stations do not support roaming access of other operators. For example, radio and television and mobile can be co-established with a 5G SA base station. Meanwhile, the broadcasting and television can build a 5G SA base station by itself, and the mobile broadcasting and television can also build a 5G SA base station by itself. The 5G SA base station built by broadcasting and mobile allows the access of broadcasting users and mobile users. The 5G SA base station built by the broadcasting and television usually only allows the access of broadcasting and television users, but not allows the access of mobile users. The mobile self-built 5G SA base station usually only allows the access of mobile users, but not allows the access of broadcasting and television users. The mobile subscriber refers to a subscriber who makes an account in a China Mobile operator. Similarly, the radio and television users refer to users who open accounts in the China radio and television operators.

3) One party of the shared network may have no independent base station (self-built base station) or only has an independent base station in a partial area under other standards, and the other party of the shared network is leased to provide service for the user in the uncovered area, so that the user is allowed to access in a roaming way. For example, broadcasting and television can rent a mobile 2G/4G base station, and the mobile allows a broadcasting and television user to access a mobile core network in a roaming manner, so that network services under 2G/4G are provided for the broadcasting and television user.

Currently, mobility management between operators (e.g., radio, television and mobile) in a network sharing and roaming scenario has the following problems:

a) and the inter-4G/5G inter-system reselection of the broadcasting and television users is abnormal.

Scene 1: when a radio and television user moves from a China Mobile 4G roaming network to a China Mobile 5G network, after reselecting a China Mobile 5G cell, the radio and television user is refused to drop the network due to #15 and other reasons after initiating mobile registration. Wherein, the #15 cause value indicates that there is No suitable cell (No reliable cells in tracking area) under the current location area (TA), usually due to the user not opening an account or defaulting.

Scene 2: when a radio and television user moves from a China Mobile 4G roaming network to a China Mobile and radio and television shared 5G network, and cell reselection is performed under the shared network according to protocol regulations (TS 23.122), the radio and television user must select RPLMN (or EPLMN) to register, so that the radio and television user still initiates mobility registration on a cell with a PLMN of 46000, and then the radio and television user is refused due to #15 and other reasons, and network drop is caused.

Wherein the protocol specifies the following: when the MS reselects to one cell in the shared network, the AS may indicate multiple PLMNs to the NAS according to 3GPP TS25.304[32]. The MS should select one of these PLMNs and if a registered PLMN is available in these PLMNs, the MS should not select the other PLMN. (When The MS resistors to a cell in a shared network, The AS major index multiple PLMN identities to The NAS coding to 3GPP TS25.304[32]. The MS short chlorine one of The PLMNs, If The registered PLMN is available amplitude The PLMNs, The MS short not chlorine a differential PLMN ]

Scene 3: when a radio and television user moves from a China Mobile 4G roaming network to a radio and television 5G network, the RPLMN stored by the radio and television user is 46000 at the moment, so that the radio and television user cannot directly initiate reselection to a cell with a PLMN of 46015.

The above scenes exist when the broadcasting and television user moves from the broadcasting and television 5G network to the China Mobile roaming 4G network.

b) And the switching between the broadcasting and television users 4G/5G is abnormal.

Scene 1: the method comprises the steps that a radio and television user initiates cell switching from a 4G roaming network to a radio and mobile 5G shared network, and since the PLMN of the network where the radio and television user is located before switching is 46000, mobile registration can be initiated on the 46000 after the radio and television user is switched to the 5G shared cell, and the registration can be rejected by a network side at the moment, so that network drop is caused.

Scene 2: the broadcasting and television user initiates the switching from the broadcasting and television 5G network to the mobile 4G roaming cell, because the network RPLMN (EPLMN) before the switching is 46015, after the switching to the 46000 4G cell, the network PLMN is changed, the mobility registration cannot be initiated, only the initial registration can be initiated again, and the service interruption is caused.

c) And the high-priority background search function of the radio and television user 5G is abnormal.

When a radio and television user starts high-priority background search in a mobile 4G roaming network, the designated PLMN is the RPLMN (46000), and the searched 5G cells are China mobile cells, and the 5G cells of the radio and television cannot be searched, so that the radio and television cannot reside in the 5G cells of the radio and television.

Aiming at the problems in the mobility management scene under the network sharing and roaming scene among operators, the application provides a method for inter-system cell reselection, handover or background search, which can respectively configure SEPLMN and CEPLMN according to RAT. The SEPLMN is used for supplementing (adding) to the EPLMN list of the UE, and the CEPLMN is used for deleting from the EPLMN list of the UE. When the terminal device performs inter-system cell reselection, handover (e.g., reselecting from a 4G cell, handing over to a 5G cell) or background search (high-priority RAT background search, e.g., searching for a 5G cell under a 4G cell), the access layer may update the EPLMN list according to the sepmn and the cepmn, and then perform inter-system cell reselection, handover, or background search according to the updated EPLMN list, thereby implementing inter-system reselection/handover and high-priority RAT background search functions across operators.

Fig. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present application. The communication system may include an access network and a core network. The access network may include a broadcasting terminal 100, a broadcasting 5G base station 200 (e.g., a broadcasting self-established 5G SA base station), a broadcasting and mobile combined 5G base station 300, a mobile 4G base station 400 (which may be leased by broadcasting so as to allow a broadcasting user to access), and a mobile 5G base station 500 (e.g., a mobile self-established 5G SA base station). The core networks may include a broadcast core network 600 and a mobile core network 700.

The PLMN broadcasted by the radio and television 5G base station 200 may be 46015 (representing a radio and television network); PLMNs broadcast by the radio and mobile infrastructure 5G base station 300 may include 46015 and 46000 (representing a mobile network); the PLMN broadcasted by mobile 4G base station 400 may be 46000; the PLMN broadcasted by mobile 5G base station 500 may be 46000. Of course, the PLMNs broadcast by the base stations of different operators may also include others, for example, the PLMNs broadcast by the mobile 5G base station 500 may also include 46002, 46007, 46008, and the like, which is not limited in this application.

The radio and television terminal can directly access the radio and television 5G base station 200 and the radio and television combined 5G base station 300, can access the mobile 4G base station 400 rented by the radio and television in a roaming manner, and cannot access the mobile 5G base station 500 (the mobile 5G base station 500 is mobile and self-established, only allows a mobile user to access, and does not allow other users to access).

The 4G base station may be an evolved NodeB (eNB or eNodeB) in Long Term Evolution (LTE), and the 5G base station may be a gNB in New Radio (NR). The base station in the NR may also be referred to as a Transmission Reception Point (TRP).

The broadcasting and television terminal is terminal equipment adopting a broadcasting and television SIM/USIM card. The terminal device may also be referred to as a terminal, and is a device having a wireless transceiving function. The terminal can be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal may be a User Equipment (UE). Wherein the UE comprises a handheld device, an in-vehicle device, a wearable device, or a computing device with wireless communication capabilities. Illustratively, the UE may be a mobile phone (mobile phone), a tablet computer, or a computer with wireless transceiving function. The first electronic device may also be a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in smart grid, a wireless terminal in smart city, a wireless terminal in smart home, etc. In the embodiment of the application, the terminal device may be a terminal for independent sale, or may be a chip in the terminal.

As shown in fig. 2, in the embodiment of the present application, an electronic device 200 (such as a mobile phone) is taken as an example to exemplify a structure of a terminal device provided in the embodiment of the present application. The electronic device 200 (e.g., a cell phone) may include: the mobile communication device includes a processor 210, an external memory interface 220, an internal memory 221, a Universal Serial Bus (USB) interface 230, a charging management module 240, a power management module 241, a battery 242, an antenna 1, an antenna 2, a mobile communication module 250, a wireless communication module 260, an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, an earphone interface 270D, a sensor module 280, a button 290, a motor 291, an indicator 292, a camera 293, a display 294, and a Subscriber Identity Module (SIM) card interface 295.

The sensor module 280 may include a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, and the like.

It is to be understood that the illustrated structure of the present embodiment does not constitute a specific limitation to the electronic apparatus 200. In other embodiments, electronic device 200 may include more or fewer components than shown, 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.

Processor 210 may include one or more processing units, such as: the processor 210 may include an Application Processor (AP), a modem processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a memory, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a neural-Network Processing Unit (NPU), etc. The different processing units may be separate devices or may be integrated into one or more processors.

The controller may be a neural center and a command center of the electronic device 200. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 210 for storing instructions and data. In some embodiments, the memory in the processor 210 is a cache memory. The memory may hold instructions or data that have just been used or recycled by processor 210. If the processor 210 needs to use the instruction or data again, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 210, thereby increasing the efficiency of the system.

In some embodiments, processor 210 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a general-purpose input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and/or a Universal Serial Bus (USB) interface, etc.

It should be understood that the connection relationship between the modules illustrated in the present embodiment is only an exemplary illustration, and does not limit the structure of the electronic device 200. In other embodiments, the electronic device 200 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The charge management module 240 is configured to receive a charging input from a charger. The charger may be a wireless charger or a wired charger. The charging management module 240 may also supply power to the electronic device through the power management module 241 while charging the battery 242.

The power management module 241 is used to connect the battery 242, the charging management module 240 and the processor 210. The power management module 241 receives input from the battery 242 and/or the charging management module 240, and provides power to the processor 210, the internal memory 221, the external memory, the display 294, the camera 293, and the wireless communication module 260. In some embodiments, the power management module 241 and the charging management module 240 may also be disposed in the same device.

The wireless communication function of the electronic device 200 may be implemented by the antenna 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, the modem processor, the baseband processor, and the like. In some embodiments, antenna 1 of electronic device 200 is coupled to mobile communication module 250 and antenna 2 is coupled to wireless communication module 260, such that electronic device 200 may communicate with networks and other devices via wireless communication techniques.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the electronic device 200 may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 250 may provide a solution including 2G/3G/4G/5G wireless communication applied on the electronic device 200. The mobile communication module 250 may include at least one filter, a switch, a power amplifier, a Low Noise Amplifier (LNA), and the like. The mobile communication module 250 may receive the electromagnetic wave from the antenna 1, filter, amplify, etc. the received electromagnetic wave, and transmit the electromagnetic wave to the modem processor for demodulation.

The mobile communication module 250 may also amplify the signal modulated by the modem processor, and convert the signal into electromagnetic wave through the antenna 1 to radiate the electromagnetic wave. In some embodiments, at least some of the functional modules of the mobile communication module 250 may be disposed in the processor 210. In some embodiments, at least some of the functional modules of the mobile communication module 250 may be disposed in the same device as at least some of the modules of the processor 210.

The wireless communication module 260 may provide a solution for wireless communication applied to the electronic device 200, including WLAN (e.g., wireless fidelity, Wi-Fi) network, bluetooth (bl electronic device, BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), Infrared (IR), and the like.

The GNSS may include a beidou satellite navigation system (BDS), a Global Positioning System (GPS), a global navigation satellite system (GLONASS), a quasi-zenith satellite system (QZSS), and/or a Satellite Based Augmentation System (SBAS).

The wireless communication module 260 may be one or more devices integrating at least one communication processing module. The wireless communication module 260 receives electromagnetic waves via the antenna 2, performs frequency modulation and filtering processing on electromagnetic wave signals, and transmits the processed signals to the processor 210. The wireless communication module 260 may also receive a signal to be transmitted from the processor 210, frequency-modulate and amplify the signal, and convert the signal into electromagnetic waves via the antenna 2 to radiate the electromagnetic waves.

The electronic device 200 implements display functions via the GPU, the display screen 294, and the application processor. The GPU is a microprocessor for image processing, and is connected to the display screen 294 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 210 may include one or more GPUs that execute program instructions to generate or alter display information.

The display screen 294 is used to display images, video, and the like. The display screen 294 includes a display panel.

The electronic device 200 may implement a shooting function through the ISP, the camera 293, the video codec, the GPU, the display screen 294, and the application processor. The ISP is used to process the data fed back by the camera 293. The camera 293 is used to capture still images or video. In some embodiments, electronic device 200 may include 1 or N cameras 293, N being a positive integer greater than 1.

The external memory interface 220 may be used to connect an external memory card, such as a Micro SD card, to extend the memory capability of the electronic device 200. The external memory card communicates with the processor 210 through the external memory interface 220 to implement a data storage function. For example, files such as music, video, etc. are saved in an external memory card.

Internal memory 221 may be used to store computer-executable program code, including instructions. The processor 210 executes various functional applications of the electronic device 200 and data processing by executing instructions stored in the internal memory 221. For example, in the present embodiment, the processor 210 may execute instructions stored in the internal memory 221, and the internal memory 221 may include a program storage area and a data storage area.

The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (e.g., audio data, a phone book, etc.) created during use of the electronic device 200, and the like. In addition, the internal memory 221 may include a high-speed random access memory, and may further include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like.

Electronic device 200 may implement audio functions via audio module 270, speaker 270A, receiver 270B, microphone 270C, headset interface 270D, and an application processor, among other things. Such as music playing, recording, etc.

The keys 290 include a power-on key, a volume key, etc. The keys 290 may be mechanical keys. Or may be touch keys. The motor 291 may generate a vibration cue. The motor 291 can be used for both incoming call vibration prompting and touch vibration feedback. Indicator 292 may be an indicator light that may be used to indicate a state of charge, a change in charge, or may be used to indicate a message, missed call, notification, etc. The SIM card interface 295 is used to connect a SIM card. The SIM card can be attached to and detached from the electronic apparatus 200 by being inserted into the SIM card interface 295 or being pulled out from the SIM card interface 295. The electronic device 200 may support 1 or N SIM card interfaces, N being a positive integer greater than 1. The SIM card interface 295 may support a Nano SIM card, a Micro SIM card, a SIM card, etc.

The information stored on the SIM card may include: 1. system raw data (writen dead cannot be modified) stored by the SIM card manufacturer. 2. Network parameters and user data, including authentication and encryption information, algorithms, parameters (which professional authorities can refer to and update) injected when a card is issued to a user by a mobile operator. 3. The data stored by the user comprises short messages, address lists and the like (the mobile phone can read and write for updating). 4. The network connection and user information data stored and updated automatically by the user in the card using process includes the position information of the last position registration, temporary mobile user number, etc. (the mobile phone can read and write for updating).

When the mobile phone uses the SIM card, the mobile phone sends a command to the SIM card, and the SIM card executes the command according to the standard specification and feeds back the result.

It is to be understood that the illustrated structure of the embodiment of the present application does not specifically limit the electronic device 200. In other embodiments of the present application, the electronic device 200 may include more or fewer components than shown, 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.

For example, the electronic device 100 may be a mobile phone, a smart remote controller, a wearable device (such as a smart band, a smart watch, or smart glasses), a handheld computer, an Augmented Reality (AR)/Virtual Reality (VR) device, a Portable Multimedia Player (PMP), a media player, or the like. The embodiment of the present application does not set any limit to the specific type of the electronic device.

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. In the description of the present application, unless otherwise specified, "at least one" means one or more, "a plurality" means two or more. In addition, in order to facilitate clear description of technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

For convenience of understanding, the method for cell reselection, handover or background search provided by the embodiments of the present application is specifically described below with reference to the accompanying drawings.

As shown in fig. 3, an embodiment of the present application provides a method for inter-system cell reselection, taking a terminal device as a UE as an example, including:

301. and starting the UE and loading the configuration information of the card.

The UE can load corresponding configuration information with the card according to an operator corresponding to the SIM/USIM card. The card configuration information may be written in a non-volatile memory NV of the terminal device.

The operator may configure SEPLMN and CEPLMN, respectively, according to the RAT. The SEPLMN and CEPLMN configured by different operators may be different. The SEPLMN and CEPLMN may be written in the NV of the terminal device.

Illustratively, the white paper published by the radio and television operator may include the following card configuration information:

as shown in table 2, when the RAT is NR (5G), the SEPLMN includes 46015, and the CEPLMN includes at least one of 46000, 46002, or 46007.

TABLE 2

RAT	SEPLMN	CEPLMN
			NR(5G)	46015	46000

As shown in table 3, when the RAT is LTE (4G), the sepplmn includes at least one of 46000, 46002, or 46007, and the cepplmn includes 46015.

TABLE 3

RAT	SEPLMN	CEPLMN
			LTE(4G)	46000	46015

Wherein SEPLMN may be used to supplement (add) to the EPLMN list of the UE and CEPLMN may be used to delete from the EPLMN list of the UE.

302. The network device broadcasts a system message.

For example, a network device (e.g., a base station) may broadcast inter-system neighbor measurement information (e.g., a neighbor list) via a System Information Block (SIB).

As shown in fig. 6, assuming that the UE is the radio and television terminal 100, the radio and television terminal 100 is located in an overlapping area 003 of a coverage 001 of a mobile 4G base station and a coverage 002 of a combined radio and television and mobile 5G base station. The radio and television terminal 100 resides in a cell (e.g., cell a) under the mobile 4G base station in a roaming manner, and the PLMN corresponding to the cell a may be 46000. Due to the fact that a different system base station (for example, a broadcast and television and mobile combined 5G base station) exists in the vicinity of the mobile 4G base station, the mobile 4G base station can inform the UE of measuring a different system adjacent cell through a system message, so that the UE can perform cell reselection. The UE in idle state may receive a system message broadcast by a network device (mobile 4G base station). The system message may be, for example, SIB2 or SIB4, which indicates an inter-system neighbor cell (i.e., a 5G cell). The inter-system neighbor cell indicated by the system message may include one or more broadcast and mobile shared 5G cells. PLMNs corresponding to the broadcast and mobile shared 5G cell may include 46000 and 46015.

303. And the UE starts the inter-system neighbor measurement.

And the UE starts the inter-system neighbor cell measurement to determine the signal quality of the inter-system neighbor cell.

As shown in fig. 6, the inter-system base station near the mobile 4G base station is a broadcast and television and mobile combined 5G base station, so the inter-system neighboring cell indicated by the system message may include one or more broadcast and mobile shared 5G cells. PLMNs corresponding to the broadcast and mobile shared 5G cell may include 46000 and 46015.

In addition, if the inter-system base station near the mobile 4G base station is the mobile 5G base station, the inter-system neighboring cell indicated by the system message may include one or more 5G mobile cells, and a PLMN corresponding to the 5G mobile cell may be 46000; if the inter-system base station near the mobile 4G base station is a broadcast and television self-established 5G base station, the inter-system neighboring cell indicated by the system message may include one or more 5G broadcast and television cells, and the PLMN corresponding to the 5G broadcast and television cell may be 46015.

304. The UE initiates cell reselection.

For example, when a radio and television user resides in a china mobile 4G roaming network, if it is determined that there is a china mobile 5G network around, cell reselection to the china mobile 5G network may be initiated.

In the process of initiating cell reselection by the UE, the EPLMN list can be modified according to the card-following configuration information, and cell reselection can be performed based on the modified EPLMN list.

Fig. 4 is a schematic diagram of a protocol stack of a UE. The UE may include a Non-access stratum (NAS) layer, an LTE Radio Resource Control (LRRC) layer, an NR Radio Resource Control (NRRC) layer, and an NR physical layer (NPHY) layer. Certainly, the UE may further include a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, and the like, which is not limited in this application. In this embodiment, the NAS layer of the UE may obtain the EPLMN list from the network device, and may issue the EPLMN list to an Access Stratum (AS) layer.

For example, as shown in fig. 5, after the UE completes a location area update (TAU)/ATTACH (ATTACH) procedure, the NAS layer (e.g., LTE Mobility Management (LMM) layer or NR mobility management (NRMM/5 GMM) layer) may read the card-associated configuration information (i.e., read the RAT + SEPLMN + CEPLMN configuration), and update the EPLMN list according to the card-associated configuration information. And if the SEPLMN configuration exists under the LTE/NR, adding the SEPLMN under the LTE/NR into the EPLMN list. And if the CEPLMN configuration exists under the LTE/NR, deleting the CEPLMN from the EPLMN list. And then uniformly sending the updated EPLMN list to an access layer (such as an LRRC layer and an NRRC layer). So that the access stratum (e.g., NRRC) performs cell camping according to the updated EPLMN list. Wherein the target cell satisfies the following conditions: the network type corresponding to the target cell is higher than that of the cell where the UE currently resides; the reselection priority corresponding to the target cell is higher than that of the cell where the UE currently resides; the load of the target cell is smaller than that of the cell where the UE currently resides; the signal quality of the target cell is higher than the cell where the UE currently resides. The priority of inter-frequency cell reselection may be set between 0 and 7, where 0 represents the lowest priority and 7 represents the highest priority. Inter-frequency cell handover is based on the size of the priority value, and the UE will typically always try to camp on the cell with the highest priority.

For example, assuming that a radio and television user is roaming in a mobile 4G cell, the content of the EPLMN list acquired by the NAS layer of the UE from the network device (e.g., mobile 4G base station) may be as shown in table 4:

TABLE 4

I.e. the EPLMN list may include 46000, 46002 and 46007.

When the UE reselects the inter-system cell, the NAS layer can modify/update the EPLMN list and send the modified/updated EPLMN list to the AS layer. For example, when a radio and television user moves from a China Mobile 4G roaming network to a China Mobile and radio and television sharing 5G network, the NAS layer can modify/update the EPLMN list according to the SEPLMN associated with NR (5G). For example, as shown in table 5, the NAS layer may add 46015 to the EPLMN list.

TABLE 5

Further, as shown in table 6, the NAS layer may delete at least one of 46000, 46002, and 46007 from the EPLMN list.

TABLE 6

EPLMN

46015

The EPLMN in the modified/updated EPLMN list is associated with NR (5G), 46015.

It should be noted that the NAS layer still stores an unmodified EPLMN list, which is used for the functions of the NAS layer, such as PLMN selection, roaming condition determination, and the like.

305. And the UE reads the system message of the target cell.

The UE may determine a target cell from the inter-system neighboring cells indicated by the network device, and read a system message of the target cell.

306. And the UE performs cell reselection evaluation.

In the prior art, when performing cell reselection evaluation, the UE selects a cell whose signal quality exceeds a preset threshold and whose PLMN is consistent with the EPLMN (or RPLMN) for camping. Wherein the EPLMN can be read from the EPLMN list. For example, a radio subscriber roaming in a mobile 4G cell may select a mobile 5G cell to camp on. However, since the china mobile does not support the 5G roaming of the radio and television user, when the radio and television user selects the mobile 5G cell to reside, the cell reselection from the 4G network to the 5G network cannot be realized, which results in the problems of network drop and power consumption, and the user experience is poor.

In the embodiment of the application, for a scenario that a radio and television user moves from a china mobile 4G network to a radio and television 5G network, the UE initiates reselection to an NR target cell, and since an sepplmn is configured under NR as 46015, 46015 may be added to an EPLMN list. Since 46015 exists in the updated EPLMN list, it is considered that the radio and television 5G cell satisfies the reselection condition, and thus the radio and television 5G cell (i.e., the 5G cell whose PLMN is 46015) can be reselected.

Moreover, when the radio and television user resides in a china mobile 4G roaming network and there is a china mobile 5G network around the radio and television user, the cemplmn 46000 is configured under NR, so the 46000 can be deleted from the EPLMN list. The UE will not reselect to the 5G cell of the china mobile, so that frequent registration is avoided being rejected.

307. The UE initiates an initial registration.

After the UE performs cell reselection, if the PLMN of the newly camped cell is different from the PLMN of the previously camped cell, initial registration may be initiated to the newly camped cell. For example, if the PLMN of the cell where the UE newly resides is 46015 and the PLMN of the cell where the UE previously resides is 46000, the UE may initiate initial registration to the newly residing cell to ensure that the UE can successfully register in the radio and television 5G network.

In addition, if the access network device of the newly camped cell and the access network device of the previously camped cell can exchange the registration information of the information terminal device, the UE can also initiate mobility registration, and can also ensure that the UE can smoothly register in the radio and television 5G network.

It should be noted that, the principle of reselection from the broadcast and television 5G network to the china mobile 4G network is similar, and the non-access stratum layer may modify the EPLMN list according to the SEPLMN and CEPLMN associated with LTE (4G).

For example, assuming that a radio and television user resides in a radio and television 5G cell, the content of the EPLMN list acquired by the NAS layer of the UE from the network device (e.g., a radio and television 5G base station) may be as shown in table 7:

TABLE 7

EPLMN

46015

When the terminal equipment reselects from the broadcasting and TV 5G network to the China Mobile 4G network, the EPLMN list can be modified/updated according to the SEPLMN associated with LTE (4G). For example, as shown in table 8, the NAS layer may add 46000 to the EPLMN list.

TABLE 8

Further, as shown in table 8, the NAS layer may delete 46015 from the EPLMN list.

TABLE 9

EPLMN

46015

Thus, the access layer of the terminal device performs cell reselection according to the modified EPLMN list, and since the modified EPLMN list includes 46000, the cell reselection can be successfully completed, and roaming registration is successful on the 46000 LTE network (4G network).

Based on the method provided by the embodiment of the application, the UE can realize inter-system cell reselection across PLMN across operators. The problems of network drop and power consumption caused by frequent registration refusal in the prior art can be avoided, and the user experience can be improved.

As shown in fig. 7, an embodiment of the present application provides a method for inter-system cell handover, which takes a terminal device as a UE as an example for description, and includes:

701. and starting the UE and loading the configuration information of the card.

The specific process may refer to the related description of step 301, which is not described herein again.

702. And when the preset conditions are met, the network equipment configures B1 and B2 measurement events for the UE.

The preset condition may include that the signal strength of the serving cell is lower than a preset threshold. When the signal strength of the serving cell is lower than the preset threshold, it may be considered that an a2 event occurs, and the terminal device may report the a2 event to the network device, so that the network device configures a B1 or B2 event measurement for inter-system handover for the user.

While the UE is in the connected state, the network device (e.g., base station) may configure the UE with B1, B2 measurement events.

The B1 event and the B2 event are two events measured by the LTE system.

B1 event: the neighbor cell is better than the absolute threshold and is used for measuring the RAT cell with high priority.

The B2 event, serving cell worse than absolute threshold 1 and neighbor cell better than absolute threshold 2, is used for RAT cell measurements of the same or low priority.

703. And the UE reports the measurement results of B1 and B2 to the network equipment.

The B1 and B2 measurement results are used to indicate whether a B1 event or a B2 event occurs, and if a B1 event or a B2 event occurs, the terminal device needs to switch to a neighboring cell of an inter-system, that is, the terminal device may execute step 704.

704. The network equipment issues a cell switching request through an RRC message.

If the B1 and B2 measurement results are used to indicate that a B1 event or a B2 event occurs, the network device may send an RRC message to the terminal device, where the RRC message may indicate the terminal device to perform inter-system cell handover.

705. And the UE informs the network equipment of the completion of the switching.

And the UE receives the RRC message and starts the inter-system cell switching according to the RRC message.

In the process of switching the inter-system cell by the UE, the NAS layer can modify/update the EPLMN list and send the modified/updated EPLMN list to the AS layer. And the UE performs cell switching based on the modified EPLMN list. For example, when a radio and television user moves from a China Mobile 4G roaming network to a China Mobile and radio and television sharing 5G network, the NAS layer can modify/update the EPLMN list. Specifically, the NAS layer may add 46015 to the EPLMN list. In this way, the UE may be enabled to handover to a broadcast and television 5G cell. Further, 46000, 46002 and 46007 may be deleted from the EPLMN list. Therefore, the UE can be ensured not to be switched to the mobile 5G cell, and service interruption caused by network side rejection is avoided.

And after the cell switching is completed/succeeded, informing the network equipment of the completion of the switching.

706. And the UE reads the system message of the switched cell.

The UE may receive a system message of the cell after handover from the network device, read the system message, and initiate registration.

707. And initiating registration of the UE to the switched cell.

In the prior art, when a radio and television user switches to a mobile 5G cell and initiates registration to the switched cell, since the china mobile does not support the 5G roaming of the radio and television user, the network side will refuse the registration request initiated by the radio and television user in the new cell (the switched cell). Thus, the UE can only initiate initial registration, which results in service interruption and affects user experience.

In the embodiment of the application, after the UE is handed over to the broadcast and television and the mobile 5G shared cell, since the cepplmn (46000) in the EPLMN list in the access stratum is removed, the sepplmn (46015) is added, so that the access stratum (e.g., NRRC) may directly select to initiate mobility registration on the handed over cell (whose PLMN is 46015), and service continuity may be ensured.

It should be understood that the network side supports the UE to perform cell handover between cells of different RATs and different operators, that is, registration information of the UE may be exchanged between networks of different operators, and then the UE initiates mobility registration to ensure that the UE can smoothly access cells of different systems.

In addition, after the UE is handed over to the china mobile 4G cell, since 46000 under LTE is added to the EPLMN list, the access layer (e.g., NRRC) can directly initiate mobility registration to the cell after the handover, and service continuity can be maintained.

Based on the method provided by the embodiment of the application, the UE can realize the inter-system cell switching of cross-PLMN of cross-operator. The problems of network drop and power consumption caused by refusing to initiate registration to the network by the UE in the prior art can be avoided, and the user experience can be improved.

As shown in fig. 8, an embodiment of the present application provides a method for searching a high-priority RAT background, which takes a terminal device as a UE as an example for description, and includes:

801. and starting the UE and loading the configuration information of the card.

802. The LRRC layer of the UE requests initiation of high priority RAT neighbor measurements from the NRRC layer of the UE.

In an idle state, the UE may actively initiate high-priority RAT neighbor measurement according to a preset rule. I.e., in case the network device (e.g., base station) is not configured with a high priority RAT neighbor (inter-system RAT neighbor), the UE may actively search for the high priority RAT neighbor. For example, the UE currently resides in a 4G cell and may actively measure a 5G neighbor cell.

803. The NRRC of the UE requests the NPHY layer of the UE to initiate high priority RAT neighbor measurements.

The NPHY layer may initiate high-priority RAT neighbor measurement, i.e., search for a signal of a network mode with a higher priority than the network mode currently operating in, and determine whether the searched signal satisfies a preset condition (e.g., whether the signal quality of the searched signal satisfies a preset threshold).

804. And the NPHY layer reports the measurement result to the NRRC layer.

After the NPHY layer performs high-priority RAT neighbor measurement, the NRRC layer may be notified of the measurement result. The measurement result may be used to indicate whether a signal of a network mode of high priority is searched for, and whether the searched signal satisfies a preset condition.

805. And the NRRC layer reports the measurement result to the LRRC layer.

The NRRC layer may forward the measurement results sent by the NPHY layer to the LRRC layer.

806. The LRRC layer requests the NRRC layer to initiate cell reselection.

If the LRRC layer determines that a signal of the network mode with high priority is searched, and whether the searched signal meets a preset condition, the NRRC layer may be requested to initiate cell reselection.

807. The NRRC layer requests the NPHY layer to initiate a cell search.

The NPHY layer can perform cell search, that is, measure whether the signal quality of the surrounding neighboring cells meets a preset threshold.

808. And the NPHY layer reports the search result to the NRRC layer.

That is, the NPHY layer may report to the NRRC layer information whether the signal quality of the surrounding neighboring cell meets the preset threshold.

809. The NRRC layer makes a cell reselection decision.

The NRRC layer may make a cell reselection decision based on the search result.

When the UE performs cell reselection, the NAS layer can modify/update the EPLMN list and issue the modified/updated EPLMN list to the AS layer. The specific process may refer to the related description of step 304, which is not described herein.

In the embodiment of the present application, when a radio and television user resides in a china mobile 4G roaming network and there is a china mobile 5G network around the radio and television user, since an SEPLMN is configured 46015 under NR, 46015 may be added to the EPLMN list. Thus, 46015 exists in the updated EPLMN list, and the radio and television 5G cell can be considered to satisfy the reselection condition, and therefore, the cell can be directly reselected to the radio and television 5G cell (i.e., the 5G cell with the PLMN 46015).

In addition, in a scenario where the radio and television user moves from the china mobile 4G network to the radio and television 5G network, when the UE initiates inter-system cell reselection, since the cepplmn 46000 is configured under NR, 46000 can be deleted from the EPLMN list. The UE will not reselect to the 5G cell of the china mobile, so that frequent registration is avoided being rejected.

810. The NRRC layer informs the LRRC layer that the cell reselection is successful.

After the NRRC layer reselects to a new cell, the LRRC layer may be notified that the cell reselection is successful.

811. The LRRC layer requests the NAS layer for cell update.

The LRRC layer may notify the NAS layer that the cell reselection is successful, and request the NAS to perform cell update.

812. The NAS layer initiates registration.

After receiving the cell reselection success notification, if determining that the PLMN of the reselected cell changes, the NAS layer can directly initiate initial registration instead of mobile registration to the reselected cell, so as to avoid network drop caused by rejection of the network side.

813. The NAS layer issues a registration REQUEST (registration REQUEST) to the NRRC layer.

After receiving the registration request, the NRRC may initiate a random access and a link establishment procedure, which may refer to a registration procedure of an SA network in the prior art, which is not described herein again.

In the prior art, a high-priority RAT background search initiated by a UE can only search a high-priority RAT cell whose PLMN is the same as that of an RPLMN (or an EPLMN), for example, a high-priority RAT background search initiated by a radio and television user roaming in a mobile 4G network can only search a mobile 5G cell, and cannot reside in a 5G network under a home operator (radio and television) in a background search manner.

In the embodiment of the application, in the process of performing the high-priority RAT background search by the UE, the NRRC may perform cell selection decision according to the modified EPLMN list, and since the PLMN (46015) of the radio and television is added to the modified EPLMN list, the UE may reselect to the radio and television 5G cell whose PLMN is 46015, and may continue to complete the subsequent reselection process. Namely, the user can reside in the 5G network under the home operator (radio and television) by means of background search.

Based on the method provided by the embodiment of the application, the UE can realize the background search between different systems crossing the PLMN from the operator. The problems of network drop and power consumption caused by refusing to initiate registration to the network by the UE in the prior art can be avoided, and the user experience can be improved.

It should be understood that the above description mainly takes the scenario in which the radio and television user reselects or switches from the mobile 4G network to the radio and television 5G network as an example, but the present application is not limited to the scenario.

For example, the mobile subscriber may reside in a connected 4G network in a roaming manner, and when the mobile subscriber needs to perform inter-system cell reselection, handover, or background search, the method provided in the embodiment of the present application may be adopted. For example, for a scenario where a mobile subscriber moves from a unicom 4G network to a mobile 5G network, a CEPLMN 46001 and an SEPLMN 46000 may be configured under NR. Since the ceplm 46001 is configured under NR, 46001 may be deleted from the EPLMN list. Therefore, the mobile user can not reselect the 5G cell of China Unicom, and frequent registration can be avoided being rejected. Also, since sepplmn 46000 is configured under NR, 46000 may be added to the EPLMN list. Thus, 46000 exists in the updated EPLMN list, so that the mobile user can be ensured to normally reside in the mobile 5G cell, and frequent requests are avoided being rejected or the network is prevented from being dropped.

The principle of reselection of the mobile subscriber from the mobile 5G network to the national unicom 4G network is similar, and the non-access stratum may modify the EPLMN list according to SEPLMN and CEPLMN. For example, when the RAT is LTE, the sepplmn includes at least one of 46001, 46006, or 46009, and the cepplmn includes at least one of 46000, 46002, or 46007. 46000, 46002 or 46007 may be removed from the EPLMN list and 46001, 46006 or 46009 may be added. The access layer performs cell reselection according to the modified EPLMN list, and since the modified EPLMN list includes 46001, 46006 or 46009, the cell reselection can be successfully completed, and roaming registration on the mobile LTE network (4G network) is successful.

In addition, China Mobile and China Unicom, China telecom plan to mutually open roaming function under 5G at present, but roaming function is not supported under 4G. Thus, when a user of a first operator (e.g., telecommunications) roams under a 5G network of a second operator (e.g., mobile), it is not possible to directly reselect, handover to, or the home operator's 4G network. Based on the method of the embodiment of the application, the functions of reselection, switching and background search among different systems of the cross-operator can be realized. For example, if a telecommunication subscriber is roaming in a mobile 5G network in an area without a telecommunication 5G network, a cepplmn ═ a and a sepplmn ═ B may be configured under LTE for a scenario where the telecommunication subscriber moves from the mobile 5G network to the telecommunication 4G network. Wherein, A can include a new PLMN (different from the current PLMN of China Mobile) started after China Mobile support 5G domestic roaming; b may include a new PLMN (different from the PLMN of the current chinese telecommunications) initiated after the chinese telecommunications support 5G national roaming. Since the LTE is configured with ceplm as a, a may be deleted from the EPLMN list. Thus, the telecommunication user will not reselect to the 4G cell of China Mobile. Also, since the sepplmn ═ B is configured under LTE, B may be added to the EPLMN list. Therefore, the updated EPLMN list has the B, so that the telecommunication user can be ensured to reside in the telecommunication 4G cell, and the phenomenon that registration is refused or network drop is frequently requested is avoided. Similar scenes are many, and the embodiments of the application are not listed.

In addition, the embodiment of the application can also support inter-system cell reselection, handover or background search from 5G to 6G across PLMNs, so as to ensure that the terminal device can smoothly access a new cell.

As shown in fig. 9, an embodiment of the present application provides a method for cell reselection, handover, or background search, including:

901. the terminal device resides in a first cell under a first RAT.

The first cell corresponds to a first PLMN, which is not the HPLMN of the terminal device. Illustratively, the terminal device may be a radio and television terminal, i.e. the home operator of the terminal device may be china radio and television. The terminal equipment can reside in a mobile 4G cell in a roaming mode, and the first PLMN comprises 46000, 46002, 46004, 46007 or 46008.

902. And if the terminal equipment meets the preset condition, the terminal equipment resides in a second cell under the second RAT.

The terminal equipment meeting the preset conditions comprises that the terminal equipment meets the conditions for performing inter-system cell reselection, handover or background search.

Wherein the second RAT is different from the first RAT. The first RAT is LTE (Long term evolution), and the second RAT is a new wireless NR; or the first RAT is NR and the second RAT is LTE.

The second cell corresponds to a first SEPLMN, the first SEPLMN is set to be an EPLMN under a second RAT, and the first SEPLMN is an HPLMN of the terminal equipment. Illustratively, the second PLMN includes 46015.

The second cell satisfies at least one of: the network type corresponding to the second cell is higher than that of the first cell; the reselection priority corresponding to the second cell is higher than that of the first cell; the load of the second cell is smaller than that of the first cell; the second cell has a higher signal quality than the first cell.

The terminal device setting the first SEPLMN to the EPLMN includes: and the non-access layer of the terminal equipment adds the first SEPLMN to the EPLMN list to obtain an updated EPLMN list, and sends the updated EPLMN list to the access layer of the terminal equipment.

Before the terminal device sets the first SEPLMN as the EPLMN, the terminal device loads the card following configuration information, and the card following configuration information is used for indicating that the EPLMN of the terminal device under the second RAT comprises the first SEPLMN.

The card accompanying configuration information is further used for indicating that the EPLMN of the terminal device under the second RAT does not include the first ceplm, and the first ceplm includes the first PLMN and includes the EHPLMN of the first PLMN.

The card configuration information is stored in a non-volatile memory NV in the terminal equipment.

Further, under the condition that the terminal device resides in the second cell, if the terminal device meets a preset condition, the terminal device may reside in a third cell under the first RAT; the third cell corresponds to a second SEPLMN, the second SEPLMN is set to be the EPLMN under the first RAT, and the second SEPLMN is a PLMN which the terminal device is allowed to camp on under the first RAT.

Embodiments of the present application also provide a chip system, as shown in fig. 10, which includes at least one processor 1001 (e.g., AP and BP) and at least one interface circuit 1002. The processor 1001 and the interface circuit 1002 may be interconnected by wires. For example, the interface circuit 1002 may be used to receive signals from other devices (e.g., a memory of a terminal equipment). Also for example, the interface circuit 1002 may be used to send signals to other devices, such as the processor 1001.

For example, the interface circuit 1002 may read instructions stored in a memory in the terminal device and send the instructions to the processor 1001. The instructions, when executed by the processor 1001, may cause a terminal device (e.g., the electronic device 200 shown in fig. 2) or a network device (e.g., the network device shown in fig. 5) to perform the steps in the above-described embodiments.

Of course, the chip system may further include other discrete devices, which is not specifically limited in this embodiment of the present application.

An embodiment of the present application further provides a computer-readable storage medium, which includes computer instructions, and when the computer instructions are executed on a terminal device (e.g., the electronic device 200 shown in fig. 2), the electronic device 200 executes various functions or steps performed by the terminal device (e.g., the UE) in the foregoing method embodiment.

Embodiments of the present application further provide a computer program product, which, when running on a computer, causes the computer to execute each function or step executed by the terminal device in the foregoing method embodiments.

The embodiment of the present application further provides a processing apparatus, where the processing apparatus may be divided into different logic units or modules according to functions, and each unit or module executes different functions, so that the processing apparatus executes each function or step executed by the terminal device in the foregoing method embodiments.

From the above description of the embodiments, it is obvious for those skilled in the art to realize that the above function distribution can be performed by different function modules according to the requirement, that is, the internal structure of the device is divided into different function modules to perform all or part of the above described functions.

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

The 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, that is, may be located in one place, or may be distributed in 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 can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should 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 of cell reselection, handover or background search, comprising:

the terminal equipment resides in a first cell under a first Radio Access Technology (RAT); the first cell corresponds to a first public land mobile network, PLMN, which is not a home public land mobile network, HPLMN, of the terminal device;

if the terminal equipment meets a preset condition, the terminal equipment resides in a second cell under a second RAT, and the second RAT is different from the first RAT;

wherein the second cell corresponds to a first Supplementary Equivalent Public Land Mobile Network (SEPLMN) set to the EPLMN under the second RAT, the first SEPLMN being the HPLMN of the terminal device.

2. The method of claim 1,

3. The method according to claim 1 or 2, wherein the second cell satisfies at least one of:

the network type corresponding to the second cell is higher than that of the first cell;

the reselection priority corresponding to the second cell is higher than that of the first cell;

the load of the second cell is less than the first cell;

the second cell has a higher signal quality than the first cell.

4. The method according to any one of claims 1-3, further comprising:

and the terminal equipment loads configuration information with the card, wherein the configuration information with the card is used for indicating that the EPLMN of the terminal equipment under the second RAT comprises the first SEPLMN.

5. The method of claim 4,

the on-card configuration information is further used for indicating that the EPLMN of the terminal device under the second RAT does not include a first delete equivalent public land mobile network (CEPLMN), the first CEPLMN including the first PLMN and including an Equivalent Home Public Land Mobile Network (EHPLMN) of the first PLMN.

6. The method according to claim 3 or 4,

the card configuration information is stored in a non-volatile memory NV in the terminal device.

7. The method according to any one of claims 1 to 6,

the first RAT is Long Term Evolution (LTE), and the second RAT is a new radio NR; or

The first RAT is NR and the second RAT is LTE.

8. The method according to any one of claims 1 to 7,

the first PLMN comprises 46000, 46002, 46004, 46007, or 46008;

the second PLMN includes 46015.

9. The method according to any one of claims 1-8, further comprising:

and the non-access layer of the terminal equipment adds the first SEPLMN to the EPLMN list to obtain an updated EPLMN list, and sends the updated EPLMN list to the access layer of the terminal equipment.

10. The method according to any of claims 1-9, wherein in case the terminal device is camped on the second cell, the method further comprises:

if the terminal equipment meets the preset condition, the terminal equipment resides in a third cell under the first RAT;

wherein the third cell corresponds to a second SEPLMN, the second SEPLMN is set to be an EPLMN under the first RAT, and the second SEPLMN is a PLMN on which the terminal device is allowed to camp under the first RAT.

11. A terminal device, comprising:

a communication unit configured to camp on a first cell under a first radio access technology, RAT; the first cell corresponds to a first public land mobile network, PLMN, which is not a home public land mobile network, HPLMN, of the terminal device;

the communication unit is further configured to camp on a second cell under a second RAT if a preset condition is met, where the second RAT is different from the first RAT;

12. The terminal device of claim 11,

13. The terminal device according to claim 11 or 12, wherein the second cell satisfies at least one of:

the load of the second cell is less than the first cell;

the second cell has a higher signal quality than the first cell.

14. The terminal device according to any of claims 11-13, further comprising a processing unit configured to:

loading configuration information with a card, wherein the configuration information with the card is used for indicating that the EPLMN of the terminal equipment under the second RAT comprises a first SEPLMN.

15. The terminal device of claim 14,

16. The terminal device according to claim 13 or 14,

17. The terminal device according to any of claims 11-16,

The first RAT is NR and the second RAT is LTE.

18. The terminal device according to any of claims 11-17,

the first PLMN comprises 46000, 46002, 46004, 46007, or 46008;

the second PLMN includes 46015.

19. The terminal device according to any of claims 11-18, wherein the processing unit is configured to:

and adding a first SEPLMN to the EPLMN list through the non-access layer to obtain an updated EPLMN list, and sending the updated EPLMN list to the access layer.

20. The terminal device according to any of claims 11-19, wherein in case the terminal device is camped on the second cell, the communication unit is further configured to:

if the preset condition is met, residing in a third cell under the first RAT;

21. A terminal device, characterized in that the terminal device comprises: a wireless communication module, memory, and one or more processors; the wireless communication module, the memory and the processor are coupled;

wherein the memory is to store computer program code comprising computer instructions; the computer instructions, when executed by the processor, cause the terminal device to perform the method of any of claims 1-10.

22. A computer-readable storage medium comprising computer instructions;

the computer instructions, when executed on a terminal device, cause the terminal device to perform the method of any one of claims 1-10.