CN117440453A - Roaming fallback method, device, terminal and network side equipment - Google Patents

Abstract

The application discloses a roaming fallback method, a device, a terminal and network side equipment, which belong to the technical field of communication, and the roaming fallback method in the embodiment of the application comprises the following steps: under the roaming condition of the terminal, if the terminal meets a first condition, the terminal falls back to a home network; wherein the roaming network is an nth generation mobile communication network, the home network is an mth generation mobile communication network, N > M, and the first condition includes at least one of: the service initiated by the terminal is a target service; the current position of the terminal is positioned at the edge position of the roaming network; the mobility state of the terminal is a target mobility state.

Description

Roaming fallback method, device, terminal and network side equipment

Technical field

This application belongs to the field of communication technology, and specifically relates to a roaming fallback method, device, terminal and network side equipment.

Background technique

Public Land Mobile Network (PLMN) is a network established and operated by the government or private operating agencies; each Subscriber Identity Module (SIM) has a home PLMN (Home PLMN, HPLMN), which is configured User profile; Visited PLMN (VPLMN) is the PLMN of the network where the terminal roams when roaming. When the terminal roams, it needs to register with the VPLMN.

Currently, if operator A has a 4G full coverage network in some areas but lacks 5G coverage; operator B provides 5G hotspot coverage, in order to allow its users to obtain 5G services in this area, operator A will Sign a 5G roaming agreement with operator B, so that users of operator A will set a 5G PLMN identity document (Identitydocument, ID) of operator B as an equivalent PLMN (Equivalent PLMN, EPLMN). In these areas, Operator A's UE can access operator B to obtain 5G services. However, there are currently no N26 interfaces and N14 interfaces between operator A and operator B. There is a phenomenon: the terminal cannot successfully fall back to the home network operator A's network through the existing fallback technology, and the terminal needs to reconnect to operator A. Initiating initial network registration brings excessive delay, which seriously affects user experience for voice services or other delay-sensitive services.

Contents of the invention

Embodiments of the present application provide a roaming fallback method, device, terminal and network side equipment, which can solve the problem in related technologies that the terminal cannot successfully fall back to the home network when performing relevant services while roaming and needs to fall back, thus causing excessive time. delay problem.

The first aspect provides a roaming fallback method, including:

When the terminal is roaming, if the terminal meets the first condition, the terminal falls back to the home network;

Wherein, the roaming network is the Nth generation mobile communication network, the home network is the Mth generation mobile communication network, N>M, and the first condition includes at least one of the following:

The service initiated by the terminal is the target service;

The current location of the terminal is located at the edge of the roaming network;

The mobility state of the terminal is the target mobility state.

The second aspect provides a roaming fallback method, including:

The network side device sends first indication information to the terminal, where the first indication information is used to indicate at least one of the following:

When the terminal is roaming, the terminal determines whether to fall back to the home network;

When the terminal is roaming, the terminal falls back to the home network when performing the target service;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the current location of the terminal;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the mobility status of the terminal;

Wherein, the roaming network is the Nth generation mobile communication network, and the home network is the Mth generation mobile communication network, N>M.

The third aspect provides a device for roaming fallback, including:

A fallback module, configured to fall back to the home network if the device meets the first condition when the device is roaming;

Wherein, the roaming network is the Nth generation mobile communication network, the home network is the Mth generation mobile communication network, N>M, and the first condition includes at least one of the following:

The service initiated by the device is the target service;

The current location of the device is located at the edge of the roaming network;

The mobility state of the device is the target mobility state.

The fourth aspect provides a device for roaming fallback, including:

A sending module, configured to send first indication information to the terminal, where the first indication information is used to indicate at least one of the following:

When the terminal is roaming, the terminal determines whether to fall back to the home network;

When the terminal is roaming, the terminal falls back to the home network when performing the target service;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the current location of the terminal;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the mobility status of the terminal;

Wherein, the roaming network is the Nth generation mobile communication network, and the home network is the Mth generation mobile communication network, N>M.

In a fifth aspect, a terminal is provided. The terminal includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the program or instructions are executed by the processor, the following implementations are implemented: On the one hand, the steps of the roaming fallback method are described.

In a sixth aspect, a terminal is provided, including a processor and a communication interface. The processor is configured to fall back to the home network if the terminal meets the first condition in the case of roaming;

Wherein, the roaming network is the Nth generation mobile communication network, the home network is the Mth generation mobile communication network, N>M, and the first condition includes at least one of the following:

The service initiated by the terminal is the target service;

The current location of the terminal is located at the edge of the roaming network;

The mobility state of the terminal is the target mobility state.

In a seventh aspect, a network side device is provided. The network side device includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. The program or instructions are executed by the processor. When implementing the steps of the roaming fallback method described in the second aspect.

In an eighth aspect, a network side device is provided, including a processor and a communication interface. The communication interface is used to send first indication information to a terminal, and the first indication information is used to indicate at least one of the following:

When the terminal is roaming, the terminal determines whether to fall back to the home network;

When the terminal is roaming, the terminal falls back to the home network when performing the target service;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the current location of the terminal;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the mobility status of the terminal;

Wherein, the roaming network is the Nth generation mobile communication network, and the home network is the Mth generation mobile communication network, N>M.

A ninth aspect provides a communication system, including: a terminal and a network side device. The terminal can be used to perform the steps of the roaming fallback method described in the first aspect. The network side device can be used to perform the steps of the second roaming fallback method. The steps of the roaming fallback method described in this aspect.

In a tenth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the roaming fallback method as described in the first aspect are implemented. Or implement the steps of the roaming fallback method described in the second aspect.

In an eleventh aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the method described in the first aspect. Method for roaming fallback, or method for implementing roaming fallback as described in the second aspect.

In a twelfth aspect, a computer program/program product is provided, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement as described in the first aspect The method of roaming fallback, or the method of implementing roaming fallback as described in the second aspect.

In the embodiment of the present application, the terminal can fall back to the home network when the terminal meets the first condition when roaming. This can also avoid the situation where the terminal roams to a roaming network of a higher network generation. If the terminal roams The network is not fully covered, causing terminal service interruption. The terminal actively falls back to the home network to ensure the smoothness of the terminal service, ensure smooth communication of the terminal, and improve user experience.

Description of the drawings

Figure 1 is a block diagram of a wireless communication system applicable to the embodiment of the present application;

Figure 2 is a flow chart of a roaming fallback method provided by an embodiment of the present application;

Figure 3 is a flow chart of another roaming fallback method provided by an embodiment of the present application;

Figure 4 is a structural diagram of a roaming fallback device provided by an embodiment of the present application;

Figure 5 is a structural diagram of another roaming fallback device provided by an embodiment of the present application;

Figure 6 is a structural diagram of a communication device provided by an embodiment of the present application;

Figure 7 is a structural diagram of a terminal provided by an embodiment of the present application;

Figure 8 is a structural diagram of a network side device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this application.

The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and that "first" and "second" are distinguished objects It is usually one type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the related objects are in an "or" relationship.

It is worth pointing out that the technology described in the embodiments of this application is not limited to Long Term Evolution (Long Term Evolution, LTE)/LTE Evolution (LTE-Advanced, LTE-A) systems, and can also be used in other wireless communication systems, such as code division Multiple Access (Code Division Multiple Access, CDMA), Time Division Multiple Access (Time Division Multiple Access, TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA), Orthogonal Frequency Division Multiple Access (OFDMA) , Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of this application are often used interchangeably, and the described technology can be used not only for the above-mentioned systems and radio technologies, but also for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in much of the following description, but these techniques can also be applied to applications other than NR system applications, such as 6th ^generation Generation, 6G) communication system.

Figure 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a palmtop computer, a netbook, or a super mobile personal computer ( ultra-mobile personalcomputer (UMPC), mobile Internet Device (MID), augmented reality (AR)/virtual reality (VR) equipment, robots, wearable devices (WearableDevice), vehicle-mounted equipment ( VUE), pedestrian terminal (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (PC), teller machines or self-service machines and other terminal sides Equipment, wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, Smart clothing, etc. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network side device 12 may include an access network device or a core network device, where the access network device 12 may also be called a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or Wireless access network unit. The access network device 12 may include a base station, a WLAN access point or a WiFi node, etc. The base station may be called a Node B, an evolved Node B (eNB), an access point, a Base Transceiver Station (BTS), a radio Base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home B-Node, Home Evolved B-Node, Transmitting Receiving Point (TRP) or the above Some other appropriate terminology in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only the base station in the NR system is used as an example for introduction. Define the specific type of base station.

For better understanding, relevant concepts and principles that may be involved in the embodiments of this application are explained below.

In related technology, the 5G specification supports the interconnection of two operator networks to allow users to roam. UEs with a valid International Mobile Subscriber Identity (IMSI) can roam and access services within the area authorized by the user. If communication has been established, within the PLMN area, in principle, the UE will not be interrupted if the subscription authorization allows it. If there are no network resources or radio coverage available locally, the UE may experience outage.

However, if the UE leaves the PLMN area, the established communication may be terminated. If the user wants to continue, he must choose another network that provides the service and establish new communication.

The network architecture that supports roaming is relatively complex. Some network functions are located in the network to which the user is connected (Visit Network, VPLMN), some network functions are located in the network that the user has signed up for (Home Network, HPLMN), and some network functions are located in both networks. It is required in every network.

International roaming services enable UEs in a specific PLMN to obtain services from a PLMN in another country. The availability of international roaming is subject to the international PLMN (inter-PLMN) agreement.

Domestic roaming services enable UEs of a specific PLMN to obtain services anywhere or in an area from another PLMN in the same country. The availability of domestic roaming depends on the requesting terminal's home PLMN (Home PLMN, HPLMN) and visited PLMN (Visit PLMN, VPLMN), and it does not depend on the subscription arrangement.

Currently, it is assumed that in some areas, operator A has a 4G full coverage network but lacks 5G coverage; operator B provides 5G hotspot coverage. In order to allow its users to obtain 5G services in this area, Operator A will sign a 5G roaming agreement with Operator B. In this way, Operator A's users will set a 5G PLMN ID of Operator B to EPLMN. , then in these areas, the UE of operator A can access operator B to obtain 5G services.

However, currently there may not be an N26 interface or an N14 interface between the networks of operator A and B. Therefore, when operator B’s network supports the NR voice (Voice over NR, VONR) function, the UE of operator A that does not support VONR will not support VONR in the 5G network. Voice services can only be obtained through the Evolved Packet System (EPS) fallback in the network; however, due to the lack of N26/N14 interface, operator A's UE cannot perform handover-based calls when performing a call. EPSFallback, and it is observed that when the user of operator A falls back to the 4G cell of HPLMN through redirection, the tracking area update (Tracking Area Update, TAU) step will fail (the core network of HPLMN rejects the UE's TAU request because it cannot Identify the UE identity), so that the UE can only switch to normal registration behavior, which will bring a long delay and cause the UE to drop calls.

Even for the UE of operator A that supports VONR, since the 5G network of operator B is not fully covered, the UE may need to fall back to the 4G network of HPLMN during the movement. Since there is no N26/N14 interface, the same problem will occur. The above-mentioned TAU failure problem occurs, so there is also a risk of call drop.

Similarly, for other delay-sensitive services, when the UE moves out of the coverage of Operator B's 5G network, Operator B's 5GS and Operator A's 5GS/EPS also need to interworking so that the UE can successfully Fall back to HPLMN's 4G network. However, due to the lack of N26/N14 interfaces and the observed failure of UE to perform redirection, the UE currently cannot successfully fall back when executing services. It needs to interrupt the service and re-register with the HPLMN 4G network, which is sensitive to delay. The business was also unbearable.

Among them, the N26 interface is the inter-CN interface between the Mobility Management Entity (MME) and the 5GS Access and Mobility Management Function (AMF). It is used to enable the evolved packet core network ( For the interaction between Evolved Packet Core (EPC) and NextGeneration Core (NGC), whether the network supports the N26 interface is optional. The N14 interface is the reference point between the two AMFs.

The roaming fallback method provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through some embodiments and application scenarios.

Please refer to Figure 2. Figure 2 is a schematic flowchart of a roaming fallback method provided by an embodiment of the present application. As shown in Figure 2, the method includes the following steps:

Step 201: When the terminal is roaming, if the terminal meets the first condition, the terminal falls back to the home network.

Wherein, the roaming network is the Nth generation mobile communication network, the home network is the Mth generation mobile communication network, N>M, and the first condition includes at least one of the following:

The service initiated by the terminal is the target service;

The current location of the terminal is located at the edge of the roaming network;

The mobility state of the terminal is the target mobility state.

It should be noted that the roaming network may be a visited network of the terminal, or may be an Equivalent PLMN (EPLMN). For example, when the terminal roams to VPLMN or EPLMN, if the terminal meets the above first condition, the terminal falls back to HPLMN.

In the embodiment of this application, the roaming network is the Nth generation mobile communication network, and the home network is the Mth generation mobile communication network, N>M, that is, the network generation of the roaming network is higher than that of the home network. For example, the roaming network is a 5G network and the home network is a 4G network. When the terminal roams from the home network to the roaming network, it can implement relevant 5G services based on the roaming network. When the terminal meets the first condition, for example, the terminal moves to The edge position of the roaming network, that is, the intersection position of the edge position of the cell under the 5G network and the edge position or non-edge position of the cell under the 4G network. In order to avoid service interruption of the terminal at this time or later, the terminal can actively fall back to 4G network without having to wait for relevant instructions from the network side.

Optionally, the terminal's active fallback to the home network may also include other possible situations.

For example, when the terminal is roaming, if the terminal initiates a target service at this time, for example, the target service initiated by the terminal is a voice service or a delay-sensitive service, the terminal can actively choose to fall back to the home network without having to wait for relevant information from the network side. Instructions.

Alternatively, when the terminal is roaming, if the mobility state of the terminal is the target mobility state, for example, the mobility state of the terminal is high mobility, the terminal can actively choose to fall back to the home network without waiting for relevant instructions from the network side. information. It should be noted that in this embodiment of the present application, the target mobility state is a high mobility state. For example, when the attribute parameter used to characterize the mobility of the terminal is greater than a preset threshold, the terminal is considered to be in high mobility, or it can be It is the terminal that determines whether it is in high mobility based on its own subscription parameters.

Or, when the terminal is roaming, if the terminal initiates a target service and the terminal is currently located at the edge of the roaming network, the terminal can actively fall back to the home network. For another example, when the terminal is roaming, if the mobility state of the terminal is high mobility and the terminal initiates a target service, the terminal can also actively fall back to the home network at this time. Of course, when the terminal is roaming, there may be other possible situations in which the terminal falls back to the home network based on the first condition, which will not be enumerated here.

In the embodiment of the present application, the terminal can fall back to the home network when the terminal meets the first condition when roaming. This can also avoid the situation where the terminal roams to a roaming network of a higher network generation. If the roaming network In case of problems such as terminal service interruption or excessive delay caused by insufficient full coverage, the terminal actively falls back to the home network to ensure the smoothness of the terminal service, ensure smooth communication of the terminal, and improve user experience.

Optionally, before the terminal falls back to the home network, the method further includes:

The terminal receives first indication information sent by the network side device, and the first indication information is used to indicate at least one of the following:

When the terminal is roaming, the terminal determines whether to fall back to the home network;

When the terminal is roaming, the terminal falls back to the home network when executing the target service;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the current location of the terminal;

When the terminal is roaming, the terminal determines whether to fall back to the home network based on the mobility status of the terminal.

For example, in one implementation, the network side device instructs the terminal through the first indication information that when the terminal is roaming, the terminal determines whether to fall back to the home network; furthermore, when the terminal is roaming, if the terminal meets the first condition , the terminal may determine to fall back to the home network based on the first indication information, or may also determine not to fall back to the home network based on the first indication information. In this way, the terminal can independently decide whether to actively fall back to the home network under roaming conditions and be controlled by the network, thereby improving the terminal's network processing flexibility in roaming conditions.

In another implementation manner, the network side device instructs the terminal through the first indication information that when the terminal is roaming, if the terminal performs the target service, it will fall back to the home network; furthermore, when the terminal is roaming, if the terminal initiates When the target service is executed or the target service is executed, the terminal actively falls back to the home network based on the instruction of the first indication information, so as to avoid the problem of service interruption when the terminal roams to a roaming network of a higher network generation.

In another embodiment, the network side device instructs the terminal through the first indication information whether to determine whether to fall back to the home network based on the current location of the terminal when the terminal is roaming. Furthermore, when the terminal is roaming, if the first indication information indicates that the terminal is roaming, it is determined whether to fall back to the home network based on the current location of the terminal, and the terminal determines whether to fall back to the home network based on the current location, for example It may be that when the terminal is located at the edge of the roaming network, the terminal determines to fall back to the home network. If the current location of the terminal is not located at the edge of the roaming network, the terminal may still reside in the current cell covered by the roaming network. Or, if the first indication information indicates that the terminal does not determine whether to fall back to the home network based on the current location of the terminal when roaming, the terminal does not determine whether to fall back to the home network based on the current location, that is, the terminal will not Determine whether to proactively fall back to the home network based on location. In this embodiment, the first indication information sent by the network side device enables the terminal to decide whether to fall back to the home network based on its current location, ensuring that the network controls the terminal's behavior.

In yet another embodiment, the network side device may also indicate through the first indication information whether the terminal determines whether to fall back to the home network based on the mobility status of the terminal. Furthermore, when the terminal is roaming, if the first indication information indicates that the terminal determines whether to fall back to the home network based on the mobility state of the terminal, the terminal determines whether to fall back to the home network based on its mobility state. , for example, when the mobility state of the terminal is the target mobility state (for example, high mobility), the terminal can actively fall back to the home network. Alternatively, if the first indication information indicates that the terminal does not determine whether to fall back to the home network based on the mobility state of the terminal when roaming, the terminal does not determine whether to fall back to the home network based on its mobility state, that is, the terminal will not Determine whether active fallback to the home network is required based on the mobility status. In this embodiment, the terminal can decide whether to fall back to the home network based on its mobility status based on the first indication information, which ensures that the network controls the behavior of the terminal.

Optionally, the first indication information may also include a combination of any two or more of the above four methods, which will not be enumerated here.

In this embodiment of the present application, the target service includes at least one of a voice service and a delay-sensitive service. The voice service may refer to a voice call service and a delay-sensitive service, such as making calls, video communications, delay-sensitive games, etc. The target service may be pre-configured or agreed upon by a protocol or configured by a network-side device. If the target service is configured by a network-side device, the configuration information may include a Non Access Stratum (NAS) message, a wireless resource Control (Radio Resource Control, RRC) dedicated messages or broadcast messages are carried, and the configuration information includes a service identifier.

Optionally, in the case where the first condition includes that the service initiated by the terminal is a target service, if the terminal meets the first condition, the terminal falls back to the home network, including at least one of the following:

When the terminal opens the dial pad, the terminal falls back to the home network;

When the terminal opens the address book, the terminal falls back to the home network;

When the terminal opens an application corresponding to the target service, the terminal falls back to the home network.

That is to say, when the terminal is roaming, once the terminal opens at least one of the dial pad, address book, and application program corresponding to the target service, the terminal will immediately fall back to the home network, thereby preventing the terminal from roaming under the roaming network. Excessive delays in executing target services and/or delay-sensitive services lead to service interruptions such as call drops to ensure the smoothness of the terminal's execution of target services and/or delay-sensitive services, thereby improving the user's terminal experience.

Optionally, the terminal falls back to the home network, including any of the following:

When the terminal is in the Radio Resource Control (RRC) idle state (RRC_IDLE) or RRC inactive state (RRC_INACTIVE), the terminal performs cell selection or cell reselection to fall back to the home network;

When the terminal is in the RRC connected state (RRC_CONNECTED), the terminal releases the RRC connection in the roaming network, and after returning to the RRC idle state or RRC inactive state, the terminal performs cell selection or cell reselection, to fall back to the home network.

Specifically, the terminal performs cell selection or cell reselection, including the terminal selecting a neighboring cell covered by the home network.

Optionally, before the terminal falls back to the home network, the method further includes at least one of the following:

The terminal receives the first message sent by the network side device, and determines whether the current location is located at the edge of the roaming network based on the first message. The first message includes information for determining the current location of the terminal. The first parameter includes at least one of a first threshold value, a second threshold value and a first preset duration;

The terminal determines whether the current roaming network covers the first cell, and determines whether to fall back to home based on whether the current location is located at the edge of the roaming network. network.

For example, in one implementation, the first message sent by the network side device includes a first threshold used by the terminal to determine its own location. The first threshold may be a first threshold used to determine the current cell in which the terminal is located. The threshold value of service quality. If the service quality of the current cell where the terminal is located is less than the first threshold value, and/or the neighboring cells of the terminal's current location are only cells under the home network, the terminal's current location is considered to be in the roaming network. The terminal can choose to actively fall back to the home network. Of course, the first message may also include a second threshold value and/or a first preset duration, and the terminal may be based on the first threshold value, the second threshold value, and the first preset duration. At least one item is used to determine whether the current location is at the edge of the roaming network, and then determine whether to fall back to the home network.

In this way, through the first message sent by the network side device, the terminal can determine whether the current location is located at the edge of the roaming network and the home network based on the first parameter included in the first message, so as to improve the terminal's ability to determine the location. Accuracy.

In another implementation, the terminal can determine whether the current roaming network covers the first cell. If the current first network covers the first cell, the terminal determines whether the current location is located at the edge of the roaming network. . For example, the first network where the terminal is currently located covers the first cell, and the terminal determines that if the current location is located at the edge of the roaming network, the terminal falls back to the home network. Alternatively, the first network where the terminal is currently located covers the first cell, and the terminal may fall back to the home network based on whether the current location is located at the edge of the roaming network. Of course, the terminal may also include other possible behaviors, which are not listed here.

Optionally, the terminal determines whether the current roaming network covers the first cell, including:

The terminal determines whether the current roaming network covers the first cell based on Global Positioning System (GPS) positioning information and/or network deployment information.

For example, the terminal may determine whether the current roaming network covers the first cell based on the GPS positioning information obtained by itself, or the terminal may determine the current location based on network deployment information (such as network coverage information from a big data platform). Whether the roaming network covers the first cell.

Optionally, the first cell is determined based on at least one of the following:

The tracking area of the terminal;

The notification area of the wireless access network;

Default information.

The preset information may be a preset value of square meters, square kilometers, acres, or hectares preconfigured by the network side, and the terminal may determine the first cell based on such preset information.

It should be noted that the first cell may be pre-configured, pre-defined, agreed upon by a protocol, or determined based on the terminal's own measurement volume, etc.

Optionally, determining whether the current location is located at an edge location of the roaming network includes:

If the terminal meets the second condition, the terminal determines that its current location is at the edge of the roaming network;

The second condition includes at least one of the following:

The first quality parameter of the terminal's serving cell is less than or equal to the first threshold value;

Neighboring cells of the terminal only include cells covered by the home network;

The first quality parameter of a neighboring cell is greater than or equal to the second threshold value, and the neighboring cell is a cell covered by the home network configured by the network side device.

Specifically, the terminal's determination of whether the current location is located at the edge of the roaming network and the home network may include the following situations:

Case a. If the first quality parameter of the terminal's serving cell is less than or equal to the first threshold value and/or the terminal's neighboring cells only include cells covered by the home network, the terminal determines that the current location is at the edge of the roaming network. Location; if the first quality parameter of the terminal's serving cell is greater than the first threshold value and/or the neighboring cells of the terminal's serving cell have cells covered by the same roaming network as the serving cell network, the terminal determines that the current location is not located in Roaming network edge locations.

Case b. If the first quality parameter of the neighboring cell is greater than or equal to the second threshold value, the terminal determines that the current location is at the edge of the roaming network; if the first quality parameter of the neighboring cell is less than the second threshold value, then The terminal determines that the current location is not located at the edge of the roaming network. Wherein, the neighboring cell is a cell covered by the home network configured by the network side device.

Case c. If the first quality parameter of the neighboring cell is greater than or equal to the second threshold value, and the first quality parameter of the serving cell is less than or equal to the first threshold value, the terminal determines that the current location is at the edge of the roaming network. .

Optionally, when the terminal meets the second condition, the terminal determines that its current location is at the edge of the roaming network, including:

If the terminal meets the second condition within the first preset time period, the terminal determines that its current location is at the edge of the roaming network.

For example, if within the first preset time period, the first quality parameter of the terminal's serving cell is less than or equal to the first threshold value and/or the neighboring cells of the terminal's serving cell only include cells covered by the home network, the terminal determines that the current The location is at the edge of the roaming network; if within the first preset time period, the first quality parameter of the terminal's serving cell is greater than the first threshold value and/or the neighboring cells of the terminal's serving cell have the same network as the serving cell. If the cell is covered by the roaming network, the terminal determines that the current location is not located at the edge of the roaming network.

Or, if within the first preset time period, the first quality parameter of the neighboring cell is greater than or equal to the second threshold value, the terminal determines that the current location is at the edge of the roaming network; if within the first preset time period, If the first quality parameter of the neighboring cell is less than the second threshold value, the terminal determines that the current location is not located at the edge of the roaming network.

Or, if within the first preset time period, the first quality parameter of the neighboring cell is greater than or equal to the second threshold value, and the first quality parameter of the serving cell is less than or equal to the first threshold value, the terminal determines that it is currently located The location is located at the edge of the roaming network; if within the first preset time period, the first quality parameter of the neighboring cell is less than the second threshold value, and the first quality parameter of the serving cell is greater than the first threshold value, the terminal determines that the current The location is not at the edge of the roaming network.

Optionally, the first threshold value is preconfigured or network side device configuration or protocol agreement; the second threshold value is preconfigured or network side device configuration or protocol agreement; the first preset duration is Preconfiguration or network side device configuration or protocol agreement.

Optionally, the first quality parameter includes at least one of the following:

Cell selection receive level value (cell selection receive level value, Srxlev);

Cell selection quality value (cell selection quality value, Squal);

Reference Signal Received Power (RSRP) of layer 3 or RSRP of layer 1;

Reference Signal Received Quality (RSRQ) of layer 3 or RSRQ of layer 1.

In this embodiment of the present application, before the terminal falls back to the home network, the method may further include at least one of the following:

The terminal determines the mobility state of the terminal based on the subscription parameters, and determines whether to fall back to the home network based on the mobility state of the terminal;

The terminal receives the second information sent by the network side device, determines the mobility state of the terminal based on the second information, and determines whether to fall back to the home network based on the mobility state of the terminal.

That is to say, the terminal can determine its own mobility status based on its own subscription parameters, or determine its own mobility status based on the second information sent by the network side device. Specifically, the terminal judgment is used to characterize the mobility of the terminal. Whether the attribute parameter of the mobility is greater than the preset threshold, and then determine whether to fall back to the home network based on the determined mobility state.

For example, if the mobility state of the terminal is the target mobility state (such as high mobility), the terminal can choose to actively fall back to the home network; if the mobility state of the terminal is low mobility or fixed, the terminal can still reside. in the current neighborhood.

Optionally, the second information sent by the network side device includes a second parameter used to determine the mobility state of the terminal, and the second parameter includes at least one of a third threshold value and a second preset duration.

It should be noted that the third threshold value may be a threshold value used to determine the current service quality of the terminal. For example, if the change value of the service quality of the terminal in the second preset time period is greater than the third threshold value, Then it can be considered that the current mobility state of the terminal is high mobility, and the terminal can choose to fall back to the home network. In this way, the terminal can determine its own mobility status based on the second parameter carried in the second information sent by the network side device, which provides a judgment benchmark for the terminal, thereby improving the accuracy of the terminal's judgment of its own mobility status. sex.

Optionally, the terminal determines the mobility state according to the change value of the service quality in the second preset time period, including when the current service quality of the terminal is lower than the reference quality, and the current service quality of the terminal is different from the If the difference between the reference qualities is greater than the third threshold value, the mobility state of the terminal is a target mobility state, such as a high mobility state.

Optionally, when the second condition is met, the reference quality is the service quality of the current serving cell, and the second condition includes at least one of the following:

The terminal selects or reselects or switches to a new cell;

Within the second preset time period, the mobility state of the terminal is the target mobility state.

For example, if the terminal selects or reselects or switches to a new cell, the reference quality is the service quality of the new cell. Alternatively, if within the second preset time period, the mobility state of the terminal is always the target mobility state (for example, high mobility state), then the reference quality is the service quality of the current serving cell where the terminal is located.

It should be noted that the second preset duration is preconfigured or network side device configuration or protocol agreement; the third threshold value is preconfigured or network side device configuration or protocol agreement.

Optionally, the service quality of the current serving cell includes at least one of the following:

Srxlev;

Squal;

Layer 3 RSRP or Layer 1 RSRP;

RSRQ for layer 3 or RSRQ for layer 1.

In this embodiment of the present application, the method may further include:

When the third condition is met, the terminal roams from the home network to a network in the EPLMN list;

Wherein, the third condition includes at least one of the following:

The target network in the EPLMN list is the L-generation mobile communication network, L>M;

The residence time of the terminal in the home network is greater than or equal to a third preset time period;

The signal quality of the cells covered by the target network in the EPLMN list meets the requirements for cell selection or cell reselection;

The target network in the EPLMN list covers the first cell.

Optionally, the first cell is determined based on at least one of the following:

The tracking area of the terminal;

The notification area of the wireless access network;

Default information.

The preset information may be a preset value of square meters, square kilometers, acres, or hectares preconfigured by the network side, and the terminal may determine the first cell based on such preset information.

It should be noted that the first cell may be pre-configured, pre-defined, agreed upon by a protocol, or determined based on the terminal's own measurement volume, etc. .

Specifically, the residence time of the terminal in the home network is greater than or equal to the third preset time period, including the residence time of the terminal in the home network after the home network completes the latest target service. Greater than or equal to the third preset duration.

Some of the situations covered by the above third condition are explained below.

For example, if the network generation of network A in the EPLMN list is higher than the home network, for example, network A is a 5G network and the home network is a 4G or 3G network, the terminal can roam from the home network to the network A, and then in network A Carry out relevant business.

Alternatively, if the terminal's residence time in the home network reaches the third preset time after performing the last voice service and/or delay-sensitive service in the home network, the terminal can also choose to roam to a network in the EPLMN list. Wherein, the third preset time period is greater than or equal to 0, and the third preset time period may be stipulated or predefined by network side device configuration or protocol.

Or, if the signal quality of the cell covered by network A in the EPLMN list meets the terminal's requirements for cell selection or cell reselection, the terminal can roam to network A.

Or, if the terminal is moving, network A in the EPLMN list covers the first cell. , then the terminal can roam to the network A. Specifically, the first cell includes a tracking area of the terminal, a notification area based on the wireless access network, or a preset value of square meters/square kilometers/acres/hectares, etc.; the first cell can be pre-configured, Predefined, agreed upon by protocol, or determined based on terminal implementation.

Optionally, the scenario in which the terminal roams to the network in the EPLMN list may also include a combination of the above situations, which will not be enumerated here.

In order to better understand the technical solutions provided by this application, several specific embodiments will be used to illustrate the following.

Embodiment 1

When the operator to which the UE's HPLMN belongs does not support 5G services, but it has an EPLMN that belongs to another operator and supports 5G services, the UE chooses to roam to the network of the operator that supports 5G services. In other words, the UE chooses EPLMN supporting 5G.

When the UE initiates a voice service or performs a delay-sensitive service, for example, when the terminal opens the dial pad, or the terminal opens the address book, or the terminal opens an application corresponding to the voice service or delay-sensitive service, the terminal immediately actively returns to the home of the HPLMN. network.

Wherein, when the UE is in the RRC_IDLE state or the RRC_INACTIVE state, the UE actively returns to the network where the HPLMN belongs, including the UE performing cell selection or cell reselection, that is, the UE performs cell selection or cell reselection to fall back to the HPLMN. Belonging network.

When the UE is in the RRC_CONNECTED state, the UE actively returns to the network where the HPLMN belongs, including the UE releasing the RRC connection in the roaming network, returning to the RRC_IDLE state or RRC_INACTIVE state, and performing cell selection or cell reselection to fall back to the HPLMN home network. network.

When performing cell selection or cell reselection, the terminal selects a cell covered by the home network.

Embodiment 2

When the UE is roaming, the UE decides whether to actively return to the network to which the HPLMN belongs based on its current location area. For example, the UE decides whether to return to the network to which the HPLMN belongs based on the 5G coverage of the current area. Specifically, the UE determines the 5G coverage at its current location, and decides whether to actively return to the network to which the HPLMN belongs based on the 5G coverage at its current location.

Wherein, the 5G coverage of the UE's current location determined by the UE includes one or more of the following:

The UE decides whether to actively return to the network to which the HPLMN belongs based on whether its current location is located at the cell boundary of the roaming network. The cell boundary is the intersection of the edge of the cell included in the HPLMN's 4G network and the cell included in the roaming 5G network. ;

The UE determines whether it is roaming based on the terminal's local statistical location information (such as Global Positioning System (GPS) data or location information obtained by other positioning means) and network deployment information (such as network coverage information from the big data platform). 5G network coverage area boundaries.

Optionally, the UE decides whether to actively return to the HPLMN home network based on the 5G coverage of its current location, including:

If the UE determines that its current location is at the coverage boundary or cell boundary of the 5G network, the UE actively returns to the network to which the HPLMN belongs;

If the UE determines that its current location is not located at the coverage boundary or cell boundary of the 5G network, the UE will still camp in the current cell.

Further, the prerequisites for the UE to decide whether to actively return to the network to which the HPLMN belongs based on the 5G coverage of its current location include any one or more of the following:

1. The UE receives the first indication information sent by the network side device. The first indication information indicates whether the UE can decide whether to actively return to the network to which the HPLMN belongs based on the 5G coverage of the current location of the UE;

2. The UE receives the first message sent by the network side device. The first message includes parameters for the UE to determine its own 5G coverage. The parameters include one or more of the following: a. The first threshold value, b. The first preset duration;

3. When the communication standard of the UE's home network (such as 4G/LTE/E-UTRAN) lags behind the communication standard of the roaming network (such as 5G/NR), the UE determines its current location area.

In this embodiment, the method for the UE to determine whether its current location is located at the cell boundary includes one or more of the following:

1. If the quality of the UE's serving cell is lower than or equal to the first threshold value, the UE considers itself to be at the cell boundary; otherwise, the UE considers itself not to be at the cell boundary;

2. If within the first preset time period, the quality of the UE's serving cell is lower than or equal to the first threshold value, the UE considers itself to be at the cell boundary; otherwise, the UE considers itself not to be at the cell boundary;

3. If the quality of the neighboring cell is higher than or equal to the second threshold value, the UE considers itself to be at the cell boundary; otherwise, the UE considers itself not to be at the cell boundary;

4. If the quality of the neighboring cell is higher than or equal to the second threshold within the first preset time period, the UE considers itself to be at the cell boundary; otherwise, the UE considers itself not to be at the cell boundary;

5. If the quality of the neighboring cell is higher than or equal to the second threshold and the quality of the serving cell is lower than or equal to the first threshold, the UE considers itself to be at the cell boundary; otherwise, the UE considers itself not to be at the cell boundary;

6. If the quality of the neighboring cell is higher than or equal to the second threshold value and the quality of the serving cell is lower than or equal to the first threshold value within the first preset time period, the UE considers itself to be at the cell boundary; otherwise, the UE considers itself to be at the cell boundary. Not at the boundary of the community.

7. The neighboring cells of the terminal's serving cell are only cells covered by the home network.

Wherein, the quality of the serving cell or the quality of neighboring cells includes one or more of the following:

Srxlev;

Squal;

Layer 3 RSRP or Layer 1 RSRP;

RSRQ for layer 3 or RSRQ for layer 1.

The above-mentioned first threshold value, second threshold value and first preset duration may be configured or pre-configured on the network side device or agreed upon in a protocol.

The neighboring cell is a cell covered by the home network configured by the network side device.

Embodiment 3

When the UE is roaming, the UE decides whether to actively return to the network where the HPLMN belongs based on its own mobility.

Among them, the UE decides whether to actively return to the network where the HPLMN belongs based on its own mobility, including:

a. If the UE determines that it is not low-mobility, the UE actively returns to the network where the HPLMN belongs;

b. If the UE determines that it has low mobility, the UE still camps in the current cell.

Optionally, the method for the UE to determine its own mobility includes one or more of the following:

a.UE determines whether it meets the low mobility or immobility criterion;

b.UE determines its own mobility based on its own subscription parameters.

Optionally, the conditions for the UE to decide whether to actively return to the HPLMN home network based on its own mobility include any of the following:

The UE receives the first indication information sent by the network side device, and the first indication information indicates whether the UE can decide whether to actively return to the network to which the HPLMN belongs based on the UE's own mobility;

The UE receives a second message sent by the network side device, where the second message includes parameters for the UE to determine its own mobility, where the parameters include at least one of a third threshold value and a second preset duration.

In this embodiment, the low mobility or immobility criteria include:

If the difference between the UE's current service quality and the reference quality is lower than or equal to the third threshold value, the UE meets the low mobility or immobility criterion; otherwise, the UE does not meet the low mobility or immobility criterion.

Wherein, in any of the following situations, the reference quality is the quality of the current serving cell:

a. The UE selects or reselects a new cell;

b. The quality of the current serving cell is higher than the reference quality;

c. Within the second preset time period, the mobility state of the UE does not meet the low mobility or immobility criteria.

The above-mentioned second preset time period may be configured or pre-configured on the network side device or agreed upon by a protocol.

The quality of the current serving cell includes one or more of the following:

Srxlev;

Squal;

Layer 3 RSRP or Layer 1 RSRP;

RSRQ for layer 3 or RSRQ for layer 1.

Embodiment 4

When the UE is roaming, the UE decides whether to actively return to the network where the HPLMN belongs based on its current location area and its mobility. For example, the UE determines the 5G coverage of its current location area and the UE determines its mobility. If the UE is neither located at the coverage boundary or cell boundary of the 5G network or the tracking area of the UE is covered by the roaming network, and If the mobility is also low, the UE still resides in the current cell; otherwise, the UE actively returns to the network where the HPLMN belongs.

The conditions for the UE to decide whether to actively return to the network where the HPLMN belongs based on its current location area and its mobility include any of the following:

a. The UE receives the first indication information sent by the network side device. The first indication information indicates whether the UE can decide whether to actively return to the network where the HPLMN belongs based on its current location area and its own mobility;

b. The UE receives the third message sent by the network side. The third message includes the parameters for the UE to determine its own location area and the parameters for the UE to determine its own mobility. For details, please refer to the parameters included in the first message in the second embodiment and The parameters included in the second message in Embodiment 3 will not be described again here.

Embodiment 5

When the UE is roaming, the UE decides whether to actively return to the HPLMN home network based on whether its current location area is located at the cell boundary and the execution of voice services or delay-sensitive services, including the 5G in the location area where the UE determines its location. coverage.

If the UE determines that the current location area is located at the coverage boundary or cell boundary of the 5G network or the UE's tracking area does not have continuous roaming network coverage (see the second embodiment for the determination method), when the UE initiates a voice service or a delay-sensitive service , the UE actively returns to the network to which the HPLMN belongs.

Embodiment 6

When the UE is roaming, the UE decides whether to actively return to the network where the HPLMN belongs based on its own mobility and the execution of voice services or delay-sensitive services, including the UE's determination of its own mobility.

For example, if the UE determines that it is not low-mobility (for the determination method, see Embodiment 3), when the UE initiates a voice service or a delay-sensitive service, the UE actively returns to the network to which the HPLMN belongs.

Embodiment 7

When the UE is roaming, the UE decides whether to actively return to the HPLMN home network based on its current location area, the UE's mobility and the execution of voice services or delay-sensitive services, including the location area where the UE determines its location. 5G coverage and determining your own mobility.

For example, if the UE determines that it is not low-mobility, and the UE determines that its current location is at the coverage boundary or cell boundary of the 5G network or the UE's tracking area does not have continuous roaming network coverage, the voice service or delay will be delayed before the UE initiates the voice service. For sensitive services, the UE actively returns to the network to which the HPLMN belongs.

Embodiment 8

When one or more of the following conditions are met, the UE roams from the HPLMN network to the network in the EPLMN list:

1. In the EPLMN list, the network communication standard of EPLMN-A is higher than the current network communication standard of HPLMN; for example, EPLMN-A is a 5G network and HPLMN is a 4G network;

2. After the UE completes the last voice service or delay-sensitive service in the HPLMN, the dwell time in the HPLMN reaches the preset duration; where the preset duration ≥ 0 can be network-side device configuration or protocol stipulations;

3. The signal quality of the cells covered by EPLMN-A meets the conditions for cell selection or cell reselection;

4. Where the UE is located, the network communication standard corresponding to EPLMN-A has continuous coverage; for example, the location area where the UE moves is within the 5G network coverage of EPLMN-A.

Please refer to Figure 3. Figure 3 is a flow chart of another roaming fallback method provided by an embodiment of the present application. As shown in Figure 3, the method includes the following steps:

Step 301: The network side device sends first indication information to the terminal, where the first indication information is used to indicate at least one of the following:

When the terminal is roaming, the terminal determines whether to fall back to the home network;

When the terminal is roaming, the terminal falls back to the home network when executing the target service;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the current location of the terminal;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the mobility status of the terminal;

Wherein, the roaming network is the Nth generation mobile communication network, and the home network is the Mth generation mobile communication network, N>M.

Optionally, the target service includes at least one of a voice service and a delay-sensitive service.

In the embodiment of the present application, the network side device can send first indication information to the terminal. The first indication information can indicate whether the terminal determines whether to fall back based on the execution of the target service, location and mobility status when the terminal is roaming. to the home network, thereby avoiding the problem of terminal service interruption if the roaming network is not fully covered when the terminal roams to a roaming network of a higher network generation, and the terminal can actively fall back to the home network to ensure the continuity of terminal services. Smoothness ensures smooth communication of the terminal.

Optionally, the method also includes:

The network side device sends a first message to the terminal. The first message includes a first parameter used to determine the current location of the terminal. The first parameter includes a first threshold value, a second threshold value, and a first threshold value. value and at least one of the first preset duration.

Optionally, the method also includes:

The network side device sends a second message to the terminal. The second information includes a second parameter used to determine the mobility status of the terminal. The second parameter includes a third threshold value and a second preset duration. at least one of.

It should be noted that the roaming fallback method provided by the embodiments of the present application is performed by a network-side device and corresponds to the roaming fallback method performed by the terminal. The relevant concepts and specific implementation processes involved in the embodiments of the present application may be: Referring to the description in the method embodiment described above in Figure 2, to avoid repetition, the details will not be described again here.

For the roaming fallback method provided in the embodiment of the present application, the execution subject may be a roaming fallback device. In the embodiment of the present application, the method of performing roaming fallback by the roaming fallback device is taken as an example to illustrate the roaming fallback device provided by the embodiment of the present application.

Please refer to Figure 4, which is a structural diagram of a roaming fallback device provided by an embodiment of the present application. As shown in Figure 4, the roaming fallback device 400 includes:

Fallback module 401, configured to fall back to the home network if the device meets the first condition when the device is roaming;

Wherein, the roaming network is the Nth generation mobile communication network, the home network is the Mth generation mobile communication network, N>M, and the first condition includes at least one of the following:

The service initiated by the device is the target service;

The current location of the device is located at the edge of the roaming network;

The mobility state of the device is the target mobility state.

Optionally, the device also includes:

The first receiving module is configured to receive first indication information sent by the network side device, where the first indication information is used to indicate at least one of the following:

When the device is roaming, determine whether to fall back to the home network;

When the device is roaming, the device falls back to the home network when performing the target service;

When the device is roaming, whether to determine whether to fall back to the home network based on the current location of the device;

When the device is roaming, whether to fall back to the home network is determined based on its own mobility status.

Optionally, the target service includes at least one of a voice service and a delay-sensitive service.

Optionally, the first condition includes that the service initiated by the terminal is a target service, and the fallback module 401 is further configured to perform at least one of the following:

With the device turning on the dial, fall back to the home network;

When the device opens the address book, fall back to the home network;

When the device opens an application corresponding to the target service, it falls back to the home network.

Optionally, the fallback module 401 is also used to perform any of the following:

When the device is in the radio resource control RRC idle state or RRC inactive state, perform cell selection or cell reselection to fall back to the home network;

When the device is in the RRC connected state, after the roaming network releases the RRC connection and returns to the RRC idle state or RRC inactive state, cell selection or cell reselection is performed to fall back to the home network.

Optionally, the device further includes a determining module configured to perform at least one of the following:

Receive a first message sent by the network side device, and determine whether the current location is located at the edge of the roaming network based on the first message, where the first message includes a third parameter used by the device to determine its own location. A parameter, the first parameter includes at least one of a first threshold value, a second threshold value and a first preset duration;

Determine whether the current roaming network covers the first cell, and determine whether the current location is located at the edge of the roaming network.

Optionally, the determination module is also used to:

Determine whether the current roaming network covers the first cell based on the Global Positioning System (GPS) positioning information and/or network deployment information.

Optionally, the first cell is determined based on at least one of the following:

The tracking area of the terminal;

The notification area of the wireless access network;

Default information.

Optionally, the determination module is also used to:

If the device meets the second condition, it is determined that the current location is located at the edge of the roaming network;

The second condition includes at least one of the following:

The first quality parameter of the serving cell of the device is less than or equal to the first threshold value;

The first quality parameter of a neighboring cell is greater than or equal to the second threshold value, and the neighboring cell is a cell covered by the home network configured by the network side device.

Optionally, the determination module is also used to:

If the first condition is met within the first preset time period, it is determined that the current location of the device is located at the edge of the roaming network.

Optionally, the first quality parameter includes at least one of the following:

Cell selection reception level value Srxlev;

Cell selection quality value Squal;

Reference signal received power RSRP for layer 3 or RSRP for layer 1;

Reference signal reception quality RSRQ for layer 3 or RSRQ for layer 1.

Optionally, the device further includes a determining module configured to perform at least one of the following:

determining mobility of the device based on subscription parameters of the device and determining whether to fall back to a home network based on mobility status of the device;

Receive the second information sent by the network side device, determine the mobility status of the device based on the second information, and determine whether to fall back to the home network based on the mobility status of the device.

Optionally, the second information includes a second parameter used to determine the mobility state of the device, and the second parameter includes at least one of a third threshold value and a second preset duration.

Optionally, when the current service quality of the device is lower than the reference quality, and the difference between the current service quality of the device and the reference quality is greater than the third threshold, then the The device's mobility state is the target mobility state.

Optionally, when the second condition is met, the reference quality is the service quality of the current serving cell, and the second condition includes at least one of the following:

The device selects or reselects or switches to a new cell;

Within the second preset time period, the mobility state of the device is the target mobility state.

Optionally, the device also includes:

A roaming module, configured to roam from the home network to a network in the Equivalent Public Land Mobile Network EPLMN list when the third condition is met;

Wherein, the third condition includes at least one of the following:

The target network in the EPLMN list is the L-generation mobile communication network, L>M;

The residence time of the device in the home network is greater than or equal to a third preset time period;

The signal quality of the cells covered by the target network in the EPLMN list meets the requirements for cell selection or cell reselection;

The target network in the EPLMN list covers the first cell.

In the embodiment of the present application, the device can fall back to the home network when the first condition is met while roaming. This can also prevent the device from roaming to a roaming network of a higher network generation. If the roaming network is not fully covered and causes service interruption of the device, the device will actively fall back to the home network to ensure the smoothness of the service and smooth communication of the device.

The device 400 for roaming fallback in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or may be a component in the electronic device, such as an integrated circuit or chip. The electronic device may be a terminal or other devices other than the terminal. For example, terminals may include but are not limited to the types of terminals 11 listed above, and other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., which are not specifically limited in the embodiment of this application.

The roaming fallback device 400 provided by the embodiment of the present application can implement each process implemented by the terminal in the method embodiment of Figure 2 and achieve the same technical effect. To avoid duplication, the details will not be described here.

Please refer to Figure 5, which is a structural diagram of another roaming fallback device provided by an embodiment of the present application. As shown in Figure 5, the roaming fallback device 500 includes:

The sending module 501 is configured to send first indication information to the terminal, where the first indication information is used to indicate at least one of the following:

When the terminal is roaming, the terminal determines whether to fall back to the home network;

When the terminal is roaming, the terminal falls back to the home network when executing the target service;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the current location of the terminal;

When the terminal is roaming, whether the terminal determines whether to fall back to the home network based on the mobility status of the terminal;

Wherein, the roaming network is the Nth generation mobile communication network, and the home network is the Mth generation mobile communication network, N>M.

Optionally, the target service includes at least one of a voice service and a delay-sensitive service.

Optionally, the sending module 501 is also used to:

Send a first message to the terminal, the first message including a first parameter used to determine the current location of the terminal, the first parameter including a first threshold value, a second threshold value and a first preset value. Assume at least one of the duration.

Optionally, the sending module 501 is also used to:

Send a second message to the terminal, where the second information includes a second parameter used to determine the mobility status of the terminal, where the second parameter includes at least one of a third threshold value and a second preset duration.

In the embodiment of the present application, the device can send first indication information to the terminal. The first indication information can indicate whether the terminal determines whether to fall back based on execution of the target service, location and mobility status when the terminal is roaming. to the home network, thereby avoiding the problem of terminal service interruption if the roaming network is not fully covered when the terminal roams to a roaming network of a higher network generation, and the terminal can actively fall back to the home network to ensure the continuity of terminal services. Smoothness ensures smooth communication of the terminal.

Optionally, as shown in Figure 6, this embodiment of the present application also provides a communication device 600, which includes a processor 601 and a memory 602. The memory 602 stores programs or instructions that can be run on the processor 601, for example. , when the communication device 600 is a terminal, when the program or instruction is executed by the processor 601, each step of the above roaming fallback method embodiment is implemented, and the same technical effect can be achieved. When the communication device 600 is a network-side device, when the program or instruction is executed by the processor 601, the steps of the above roaming fallback method embodiment can be achieved, and the same technical effect can be achieved. To avoid duplication, they will not be described again here.

Embodiments of the present application also provide a terminal, including a processor and a communication interface. The processor is configured to fall back to the home network if the terminal meets the first condition in the case of roaming; wherein the roaming network is the Nth generation mobile communication. Network, the home network is the Mth generation mobile communication network, N>M, the first condition includes at least one of the following: the service initiated by the terminal is the target service; the current location of the terminal is located in the roaming The edge location of the network; the mobility state of the terminal is the target mobility state. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 7 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.

The terminal 700 includes but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, a processor 710, etc. At least some parts.

Those skilled in the art can understand that the terminal 700 may also include a power supply (such as a battery) that supplies power to various components. The power supply may be logically connected to the processor 710 through a power management system, thereby managing charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 7 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or some components may be combined or arranged differently, which will not be described again here.

It should be understood that, in this embodiment of the present application, the input unit 704 may include a graphics processing unit (GPU) 7041 and a microphone 7042. The graphics processor 7041 is responsible for the image capture device (such as Process the image data of still pictures or videos obtained by the camera). The display unit 706 may include a display panel 7061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 707 includes a touch panel 7071 and at least one of other input devices 7072 . Touch panel 7071, also called touch screen. The touch panel 7071 may include two parts: a touch detection device and a touch controller. Other input devices 7072 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described again here.

In this embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 701 can transmit it to the processor 710 for processing; in addition, the radio frequency unit 701 can send uplink data to the network side device. Generally, the radio frequency unit 701 includes, but is not limited to, an antenna, amplifier, transceiver, coupler, low noise amplifier, duplexer, etc.

Memory 709 may be used to store software programs or instructions as well as various data. The memory 709 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, Image playback function, etc.) etc. Additionally, memory 709 may include volatile memory or non-volatile memory, or memory 709 may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM) , SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synch link DRAM, SLDRAM) and direct memory bus random access memory (DirectRambus RAM, DRRAM). Memory 709 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 710 may include one or more processing units; optionally, the processor 710 integrates an application processor and a modem processor, where the application processor mainly handles operations related to the operating system, user interface, application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the above-mentioned modem processor may not be integrated into the processor 710.

Among them, the processor 710 is used to fall back to the home network if the terminal meets the first condition in the case of roaming;

Wherein, the roaming network is the Nth generation mobile communication network, the home network is the Mth generation mobile communication network, N>M, and the first condition includes at least one of the following:

The service initiated by the terminal is the target service;

The current location of the terminal is located at the edge of the roaming network;

The mobility state of the terminal is the target mobility state.

In the embodiment of the present application, the terminal can fall back to the home network when the terminal meets the first condition when roaming. This can also avoid the situation where the terminal roams to a roaming network of a higher network generation. If the roaming network The problem of terminal service interruption due to insufficient coverage, and then the terminal actively falls back to the home network to ensure the smoothness of the terminal service, ensure smooth communication of the terminal, and improve the user experience.

Specifically, the embodiment of the present application also provides a network side device. As shown in FIG. 8 , the network side device 800 includes: an antenna 81 , a radio frequency device 82 , a baseband device 83 , a processor 84 and a memory 85 . The antenna 81 is connected to the radio frequency device 82 . In the uplink direction, the radio frequency device 82 receives information through the antenna 81 and sends the received information to the baseband device 83 for processing. In the downlink direction, the baseband device 83 processes the information to be sent and sends it to the radio frequency device 82. The radio frequency device 82 processes the received information and then sends it out through the antenna 81.

The method performed by the network side device in the above embodiment can be implemented in the baseband device 83, which includes a baseband processor.

The baseband device 83 may include, for example, at least one baseband board on which multiple chips are disposed, as shown in FIG. Program to perform the network device operations shown in the above method embodiments.

The network side device may also include a network interface 86, which is, for example, a common public radio interface (CPRI).

Specifically, the network side device 800 in this embodiment of the present invention also includes: instructions or programs stored in the memory 85 and executable on the processor 84. The processor 84 calls the instructions or programs in the memory 85 to execute the various operations shown in Figure 5. The method of module execution and achieving the same technical effect will not be described in detail here to avoid duplication.

Embodiments of the present application also provide a readable storage medium. Programs or instructions are stored on the readable storage medium. When the program or instructions are executed by a processor, each process of the method embodiment described in Figure 2 is implemented, or Each process of the method embodiment described in Figure 3 above can achieve the same technical effect. To avoid repetition, it will not be described again here.

Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disk, etc.

An embodiment of the present application further provides a chip. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the method described in Figure 2. Each process of the example, or each process of implementing the method embodiment described in Figure 3 above, and can achieve the same technical effect, will not be described again here to avoid repetition.

It should be understood that the chips mentioned in the embodiments of this application may also be called system-on-chip, system-on-a-chip, system-on-chip or system-on-chip, etc.

Embodiments of the present application further provide a computer program/program product. The computer program/program product is stored in a storage medium. The computer program/program product is executed by at least one processor to implement the method described in Figure 2 above. Each process of the embodiment, or each process of implementing the above method embodiment described in Figure 3, can achieve the same technical effect. To avoid repetition, it will not be described again here.

Embodiments of the present application also provide a communication system, including: a terminal and a network side device. The terminal can be used to perform the steps of the method as shown in Figure 2. The network side device can be used to perform the steps of the method as shown in Figure 3 above. Method steps.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article or apparatus that includes that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions may be performed, for example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a computer software product that is essentially or contributes to the existing technology. The computer software product is stored in a storage medium (such as ROM/RAM, disk , CD), including several instructions to cause a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Inspired by this application, many forms can be made without departing from the purpose of this application and the scope protected by the claims, all of which fall within the protection of this application.

Claims (34)

1. A method of roaming fallback comprising:

under the roaming condition of the terminal, if the terminal meets a first condition, the terminal falls back to a home network;

wherein the roaming network is an nth generation mobile communication network, the home network is an mth generation mobile communication network, N > M, and the first condition includes at least one of:

the service initiated by the terminal is a target service;

the current position of the terminal is positioned at the edge position of the roaming network;

the mobility state of the terminal is a target mobility state.

2. The method of claim 1, wherein the method further comprises, before the terminal drops back to the home network:

the terminal receives first indication information sent by network side equipment, wherein the first indication information is used for indicating at least one of the following:

determining whether the terminal falls back to a home network in the case that the terminal is roaming;

when the terminal is roaming, the terminal falls back to a home network when executing the target service;

under the condition that the terminal is roaming, whether the terminal falls back to a home network is determined based on the current position of the terminal;

In the case where the terminal is roaming, whether the terminal falls back to the home network is determined based on the mobility state of the terminal.

3. The method of claim 1, wherein the targeted traffic comprises at least one of voice traffic and delay sensitive traffic.

4. A method according to claim 3, wherein the first condition includes that the service initiated by the terminal is a target service, and if the terminal satisfies the first condition, the terminal falls back to the home network, including at least one of:

under the condition that the terminal opens the dial plate, the terminal falls back to the home network;

under the condition that the terminal opens an address book, the terminal falls back to a home network;

and under the condition that the terminal opens the application program corresponding to the target service, the terminal falls back to the home network.

5. The method of claim 1, wherein the terminal drops back to the home network, comprising any one of:

under the condition that the terminal is in a Radio Resource Control (RRC) idle state or an RRC inactive state, the terminal performs cell selection or cell reselection to fall back to a home network;

And under the condition that the terminal is in an RRC connection state, the terminal releases the RRC connection in the roaming network, and after returning to an RRC idle state or an RRC inactive state, the terminal performs cell selection or cell reselection so as to fall back to the home network.

6. The method of claim 1, wherein the terminal is further comprised of at least one of:

the terminal receives a first message sent by network side equipment, and determines whether the current position is positioned at the edge position of the roaming network based on the first message, wherein the first message comprises a first parameter for judging the current position of the terminal, and the first parameter comprises at least one of a first threshold value, a second threshold value and a first preset duration;

the terminal determines whether a roaming network where the terminal is currently located covers a first cell to determine whether a location where the terminal is currently located is located at an edge location of the roaming network.

7. The method of claim 6, wherein the terminal determining whether the roaming network in which the terminal is currently located covers the first cell comprises:

the terminal determines whether the roaming network currently located covers the first cell based on Global Positioning System (GPS) positioning information and/or network deployment information.

8. The method of claim 6, wherein the first cell is determined based on at least one of:

a tracking area of the terminal;

a notification area of the wireless access network;

and presetting information.

9. The method of claim 6, wherein determining whether the current location is at an edge location of the roaming network comprises:

under the condition that the terminal meets a second condition, the terminal determines that the current position is positioned at the edge position of the roaming network;

the second condition includes at least one of:

the first quality parameter of the serving cell of the terminal is smaller than or equal to a first threshold value;

the first quality parameter of the adjacent cell is larger than or equal to a second threshold value, and the adjacent cell is a cell covered by the home network configured by the network side equipment.

10. The method according to claim 9, wherein the determining, by the terminal, that the current location is located at the edge location of the roaming network if the terminal satisfies the second condition comprises:

and under the condition that the terminal meets the second condition within the first preset time length, the terminal determines that the current position is positioned at the edge position of the roaming network.

11. The method of claim 9, wherein the first quality parameter comprises at least one of:

a cell selection reception level value Srxlev;

cell selection quality value square;

reference signal received power RSRP for layer 3 or RSRP for layer 1;

reference signal received quality RSRQ for layer 3 or RSRQ for layer 1.

12. The method of claim 1, wherein the terminal is further comprised of at least one of:

the terminal determines the mobility state of the terminal based on the subscription parameters, and determines whether to fall back to the home network or not based on the mobility state of the terminal;

the terminal receives second information sent by the network side equipment, determines the mobility state of the terminal according to the second information, and determines whether the terminal falls back to the home network or not based on the mobility state of the terminal.

13. The method of claim 12, wherein the second information includes a second parameter for determining a mobility state of the terminal, the second parameter including at least one of a third threshold value and a second preset duration.

14. The method according to claim 13, wherein the mobility state of the terminal is a target mobility state in case the current quality of service of the terminal is lower than a reference quality and the difference between the current quality of service of the terminal and the reference quality is greater than the third threshold value.

15. The method according to claim 14, wherein the reference quality is a quality of service of a current serving cell if a second condition is met, the second condition comprising at least one of:

the terminal selects or reselects or switches to a new cell;

and in the second preset time period, the mobility state of the terminal is the target mobility state.

16. The method according to any one of claims 1-15, further comprising:

in case a third condition is met, the terminal roams from the home network to a network in an equivalent public land mobile network EPLMN list;

wherein the third condition includes at least one of:

the target network in the EPLMN list is an L-th generation mobile communication network, and L is more than M;

the residence time length of the terminal in the home network is longer than or equal to a third preset time length;

the signal quality of the cell covered by the target network in the EPLMN list meets the requirements of cell selection or cell reselection;

and the target network in the EPLMN list covers the first cell.

17. A method of roaming fallback comprising:

the network side equipment sends first indication information to the terminal, wherein the first indication information is used for indicating at least one of the following:

Determining whether the terminal falls back to a home network in the case that the terminal is roaming;

when the terminal is roaming, the terminal falls back to a home network when executing the target service;

under the condition that the terminal is roaming, whether the terminal falls back to a home network is determined based on the current position of the terminal;

if the terminal is roaming, determining whether the terminal falls back to a home network based on a mobility state of the terminal;

the roaming network is an Nth generation mobile communication network, the home network is an Mth generation mobile communication network, and N is more than M.

18. The method of claim 17, wherein the targeted traffic comprises at least one of voice traffic and delay sensitive traffic.

19. The method of claim 17, wherein the method further comprises:

the network side equipment sends a first message to the terminal, wherein the first message comprises a first parameter used for judging the current position of the terminal, and the first parameter comprises at least one of a first threshold value, a second threshold value and a first preset duration.

20. The method of claim 17, wherein the method further comprises:

the network side equipment sends a second message to the terminal, wherein the second message comprises a second parameter for judging the mobility state of the terminal, and the second parameter comprises at least one of a third threshold value and a second preset duration.

21. An apparatus for roaming back, comprising:

a fallback module, configured to, in a case where the device roams, fallback to the home network if the device meets a first condition;

wherein the roaming network is an nth generation mobile communication network, the home network is an mth generation mobile communication network, N > M, and the first condition includes at least one of:

the service initiated by the device is a target service;

the current position of the device is positioned at the edge position of the roaming network;

the mobility state of the device is a target mobility state.

22. The apparatus of claim 21, wherein the apparatus further comprises:

the first receiving module is configured to receive first indication information sent by the network side device, where the first indication information is used to indicate at least one of the following:

Determining whether to fall back to the home network if the device is roaming;

the device falling back to the home network when executing the target service, in case the device is roaming;

determining whether to fall back to a home network based on a location where the device is currently located, if the device is roaming;

in the case where the device is roaming, whether to fall back to the home network is determined based on its mobility state.

23. The apparatus of claim 21, wherein the fallback module is further configured to perform any one of:

performing cell selection or cell reselection to fall back to the home network in the event that the device is in a radio resource control, RRC, idle state or an RRC inactive state;

and in the case that the device is in the RRC connection state, after the roaming network releases the RRC connection and returns to the RRC idle state or the RRC inactive state, performing cell selection or cell reselection to fall back to the home network.

24. The apparatus of claim 21, further comprising a determination module to perform at least one of:

Receiving a first message sent by network side equipment, and determining whether the current position is positioned at the edge position of the roaming network based on the first message, wherein the first message comprises a first parameter for judging the current position of the device, and the first parameter comprises at least one of a first threshold value, a second threshold value and a first preset duration;

determining whether a roaming network currently located covers a first cell to determine whether a location currently located is located at an edge location of the roaming network.

25. The apparatus of claim 24, wherein the means for determining is further configured to:

if the device meets the second condition, determining that the current position of the device is positioned at the edge position of the roaming network;

the second condition includes at least one of:

a first quality parameter of a serving cell of the apparatus is less than or equal to a first threshold value;

the first quality parameter of the adjacent cell is larger than or equal to a second threshold value, and the adjacent cell is a cell covered by the home network configured by the network side equipment.

26. The apparatus of claim 24, wherein the means for determining is further configured to:

And under the condition that the first condition is met within the first preset time period, determining that the current position of the device is positioned at the edge position of the roaming network.

27. The apparatus of claim 19, further comprising a determination module to perform at least one of:

determining mobility of the device based on subscription parameters of the device, determining whether to fall back to a home network based on a mobility state of the device;

and receiving second information sent by network side equipment, determining the mobility state of the device according to the second information, and determining whether to fall back to a home network or not based on the mobility state of the device.

28. The apparatus according to any one of claims 21-27, wherein the apparatus further comprises:

a roaming module for roaming from the home network to a network in an equivalent public land mobile network EPLMN list if a third condition is met;

wherein the third condition includes at least one of:

the target network in the EPLMN list is an L-th generation mobile communication network, and L is more than M;

the device is longer than or equal to a third preset duration when the residence time of the home network is longer than or equal to a third preset duration;

The signal quality of the cell covered by the target network in the EPLMN list meets the requirements of cell selection or cell reselection;

and the target network in the EPLMN list covers the first cell.

29. An apparatus for roaming back, comprising:

the sending module is used for sending first indication information to the terminal, wherein the first indication information is used for indicating at least one of the following:

determining whether the terminal falls back to a home network in the case that the terminal is roaming;

when the terminal is roaming, the terminal falls back to a home network when executing the target service;

under the condition that the terminal is roaming, whether the terminal falls back to a home network is determined based on the current position of the terminal;

if the terminal is roaming, determining whether the terminal falls back to a home network based on a mobility state of the terminal;

the roaming network is an Nth generation mobile communication network, the home network is an Mth generation mobile communication network, and N is more than M.

30. The apparatus of claim 29, wherein the means for transmitting is further configured to:

and sending a first message to the terminal, wherein the first message comprises a first parameter for judging the current position of the terminal, and the first parameter comprises at least one of a first threshold value, a second threshold value and a first preset duration.

31. The apparatus of claim 29, wherein the means for transmitting is further configured to:

and sending a second message to the terminal, wherein the second message comprises a second parameter for judging the mobility state of the terminal, and the second parameter comprises at least one of a third threshold value and a second preset duration.

32. A terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method of roaming back as claimed in any one of claims 1 to 16.

33. A network side device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method of roaming fallback of any of claims 17-20.

34. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the method of roaming back in accordance with any one of claims 1-16 or the steps of the method of roaming back in accordance with any one of claims 17-20.