CN117440453A

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

Info

Publication number: CN117440453A
Application number: CN202210836977.1A
Authority: CN
Inventors: 王洋洋; 鲍炜; 杨晓东
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2024-01-23

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, roaming fallback device, terminal and network side equipment

Technical Field

The application belongs to the technical field of communication, and particularly relates to a roaming fallback method, a roaming fallback device, a roaming fallback terminal and network side equipment.

Background

The public land mobile network (Public Land Mobile Network, PLMN) is a network established and operated by a government or private operator; each subscriber identity card (Subscriber Identity Module, SIM) has a Home PLMN (HPLMN) in which a subscriber profile is configured; a Visited PLMN (VPLMN) is a PLMN to which a network roaming when the terminal roams belongs, and needs to be registered with the VPLMN when the terminal roams.

Currently, if there is a 4G full coverage network in some regional operators a, but there is no 5G coverage; if the operator B provides 5G hotspot coverage, in order for the operator a to obtain 5G services in the area, the operator a signs a 5G roaming agreement with the operator B, so that the user of the operator a sets a 5G PLMN identity number (Identity document, ID) of the operator B to be an Equivalent PLMN (EPLMN), and in these areas, the UE of the operator a can access the operator B to obtain the 5G services. However, there is currently no N26 interface and no N14 interface between the operators a and B, and there is a phenomenon: the terminal cannot successfully fall back to the network of the home network operator A through the existing fall-back technology, and the terminal needs to initiate initial network registration to the operator A again, so that overlong time delay is brought, and the user experience is seriously influenced for voice service or other time delay sensitive services.

Disclosure of Invention

The embodiment of the application provides a roaming fallback method, a roaming fallback device, a roaming fallback terminal and network side equipment, which can solve the problem that a terminal in the related art cannot successfully fall back to a home network when the terminal executes related service under the roaming condition and needs fallback, so that overlong time delay is brought.

In a first aspect, a method for roaming fallback is provided, including:

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.

In a second aspect, a method for roaming fallback is provided, including:

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.

In a third aspect, an apparatus for roaming fallback is provided, 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;

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.

In a fourth aspect, there is provided an apparatus for roaming fallback, 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:

In a fifth aspect, there is provided 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 fallback according to the first aspect.

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

the service initiated by the terminal is a target service;

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

In a seventh aspect, a network side device is provided, the 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 as described in the second aspect.

An eighth aspect provides a network side device, including a processor and a communication interface, where the communication interface is configured to send first indication information to a terminal, and the first indication information is used to indicate at least one of:

In a ninth aspect, there is provided a communication system comprising: a terminal and a network side device, the terminal being operable to perform the steps of the method of roaming fallback as described in the first aspect, the network side device being operable to perform the steps of the method of roaming fallback as described in the second aspect.

In a tenth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor, performs the steps of the method of roaming fallback as described in the first aspect, or performs the steps of the method of roaming fallback as described in the second aspect.

In an eleventh aspect, there is provided a chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute programs or instructions to implement the method of roaming fallback according to the first aspect or to implement the method of roaming fallback according to the second aspect.

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

In the embodiment of the application, the terminal can fall back to the home network when the terminal meets the first condition under the roaming condition, so that the problem that the terminal service is interrupted when the terminal roams to the roaming network with higher network generation times is avoided if the roaming network is not fully covered, and further the terminal actively falls back to the home network to ensure the smoothness of the terminal service, ensure the smooth communication of the terminal and improve the user experience.

Drawings

Fig. 1 is a block diagram of a wireless communication system to which embodiments of the present application are applicable;

FIG. 2 is a flow chart of a method for roaming fallback provided in an embodiment of the present application;

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

FIG. 4 is a block diagram of a roaming fallback device according to an embodiment of the present application;

FIG. 5 is a block diagram of another roaming fallback apparatus provided in an embodiment of the present application;

fig. 6 is a block diagram of a communication device according to an embodiment of the present application;

fig. 7 is a block diagram of a terminal according to an embodiment of the present application;

fig. 8 is a block diagram of a network side device according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally intended to be used in a generic sense and not to limit the number of objects, for example, the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It is noted that the techniques described in embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may 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 (Orthogonal Frequency Division Multiple Access, OFDMA), single carrier frequency division multiple access (Single-carrier Frequency Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the present application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New air interface (NR) system for purposes of example and uses NR terminology in much of the description that follows, but these techniques are also applicable to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 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 device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. Note that, the specific type of the terminal 11 is not limited in the embodiment of the present application. The network-side device 12 may comprise an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, a WLAN access point, a WiFi node, or the like, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmission and reception point (Transmitting Receiving Point, TRP), or some other suitable terminology in the art, and the base station is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiments of the present application, only a base station in an NR system is described as an example, and the specific type of the base station is not limited.

For a better understanding, the following description is made of the relevant concepts and principles that may be involved in the embodiments of the present application.

In the related art, the 5G specification supports interconnection of two operator networks to allow roaming of subscribers, and UEs with valid international mobile subscriber identities (International Mobile Subscriber Identity, IMSI) can roam and access services in areas authorized by subscribers. If the communication is already established, in the PLMN area, the UE will in principle not experience an interruption if allowed by the subscription authorization. If there are no network resources or radio coverage available locally, the UE may experience an interruption.

However, if the UE leaves the PLMN area, the established communication may terminate. If the user wants to continue, another serving network must be selected and a new communication established.

The network architecture supporting roaming is complex, where some network functions are located in the network to which the user is connected (visited network, VPLMN), some network functions are in the network to which the user is subscribed (home network, HPLMN), and some network functions are required in both networks.

The international roaming service enables a UE of a particular PLMN to obtain service from a PLMN of another country. The availability of international roaming is constrained by the international PLMN (inter-PLMN) protocol.

The home roaming service enables a UE of one particular PLMN to obtain service from another PLMN of the same country anywhere or in one area. The availability of domestic roaming depends on the Home PLMN (Home PLMN, HPLMN) and visited PLMN (visual PLMN, VPLMN) of the requesting terminal, which is independent of the subscription arrangement.

Currently, it is assumed that there is a 4G full coverage network in some regional operators a, but there is no 5G coverage; carrier B provides 5G hotspot coverage. Then, in order for the operator a to obtain 5G services in the area, the operator a signs up with the operator B for 5G roaming agreements, so that the user of the operator a sets one 5G PLMN ID of the operator B to EPLMN, and in these areas, the UE of the operator a can access the operator B to obtain 5G services.

However, there may not be an N26 interface and an N14 interface between the networks of the operators a and B at present, so when the network of the operator B supports a Voice Over NR (VONR) function, the UE of the operator a that does not support VONR can only obtain Voice services in the 5G network through an evolved packet system (Evolved Packet System, EPS) Fallback (Fallback); however, due to the lack of the N26/N14 interface, the UE of the operator a cannot perform EPS Fallback based on handover (handover) when performing a call, and it is observed that the step of tracking area update (Tracking Area Update, TAU) is failed when the user of the operator a drops back to the 4G cell of the HPLMN by redirection (the core network of the HPLMN refuses the TAU request of the UE because the UE identity cannot be identified), so that the UE can only turn to normal registration behavior, which causes a long delay and thus the UE drops.

Even for a UE of operator a supporting VONR, the UE may need to fall back to the 4G network of the HPLMN during the mobile procedure because the 5G network of operator B is not fully covered, and the TAU failure problem described above may also occur due to the absence of the N26/N14 interface, so there is also a risk of dropped calls.

Likewise, for other delay sensitive traffic, when the UE moves out of the 5G network coverage of operator B, the 5GS of operator B needs to interwork (interworking) with the 5GS/EPS of operator a so that the UE can successfully fall back to the 4G network of the HPLMN. However, due to the lack of the N26/N14 interface and the phenomenon that the UE cannot successfully perform redirection, the UE cannot successfully fall back when performing the service, needs to interrupt the service, re-register with the 4G network of the HPLMN, and is also intolerable to the delay sensitive service.

Wherein the N26 interface is an inter-CN interface between the mobility management node (Mobility Management Entity, MME) and the 5GS access and mobility management function (Access and Mobility Management Function, AMF) to enable interaction between the evolved packet core network (Evolved Packet Core, EPC) and the next generation core network (Next Generation Core, NGC), whether the inter-network support of the N26 interface is optional. The N14 interface is the reference point between two AMFs.

The roaming-back method provided by the embodiment of the application is described in detail below through some embodiments and application scenarios thereof with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a flow chart of a roaming fallback method according to an embodiment of the present application, as shown in fig. 2, the method includes the following steps:

step 201, if the terminal satisfies a first condition in the roaming condition, the terminal falls back to the home network.

the service initiated by the terminal is a target service;

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

The roaming network may be a visited network of the terminal, or may be an Equivalent PLMN (EPLMN). For example, in the case of roaming to the VPLMN or EPLMN, if the terminal satisfies the first condition, the terminal falls back to the HPLMN.

In this embodiment of the present application, the roaming network is an nth generation mobile communication network, the home network is an mth generation mobile communication network, and N > M, i.e., the network generation of the roaming network is higher than the home network. For example, the roaming network is a 5G network, the home network is a 4G network, the terminal can implement a related 5G service based on the roaming network in the case of roaming from the home network to the roaming network, and when the terminal satisfies the first condition, for example, the terminal moves to an edge position of the roaming network, that is, an intersection position of an edge position of a cell under the 5G network and an edge position or a non-edge position of a cell under the 4G network, in order to avoid service interruption at this time or later, the terminal can actively fall back to the 4G network without waiting for related indication information on a network side.

Optionally, the terminal actively falling back to the home network may also include other possible scenarios.

For example, in the case of roaming, if the terminal initiates the target service at this time, for example, if the target service initiated by the terminal is a voice service or a delay sensitive service, the terminal may actively select to fall back to the home network, without waiting for the relevant indication information on the network side.

Alternatively, in the case of roaming, if the mobility state of the terminal is a target mobility state, for example, the mobility state of the terminal is high mobility, the terminal may actively select to fall back to the home network without waiting for the relevant indication information on the network side. It should be noted that in the embodiment of the present application, the target mobility state is a high mobility state, for example, when an attribute parameter for characterizing mobility of the terminal is greater than a preset threshold, the terminal is considered to be in high mobility, or the terminal may determine whether to be in high mobility according to its subscription parameter.

Or, if the terminal initiates the target service and the current position of the terminal is located at the edge position of the roaming network under the roaming condition, the terminal can actively fall back to the home network. For another example, if the mobility state of the terminal is high mobility and the terminal initiates the target service under the roaming condition, the terminal may actively fall back to the home network at this time. Of course, in the case of roaming, the terminal may also include other possibilities to fall back to the home network based on the first condition, which is not excessively enumerated here.

In the embodiment of the invention, the terminal can fall back to the home network when the terminal meets the first condition under the roaming condition, so that the problem that if the roaming network is not fully covered and the terminal service is interrupted or the time delay is too long under the condition that the terminal roams to the roaming network of higher network generation times can be avoided, and further the terminal actively falls back to the home network to ensure the smoothness of the terminal service, ensure the smooth communication of the terminal and improve the user experience.

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

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:

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.

For example, in one implementation manner, the network side device indicates, through the first indication information, that the terminal is in roaming condition, and the terminal determines whether to fall back to the home network; further, when the terminal is roaming, if the terminal satisfies the first condition, the terminal may determine to fall back to the home network based on the first instruction information, or may determine not to fall back to the home network based on the first instruction information. Therefore, whether the terminal actively falls back to the home network under the roaming condition or not can be autonomously determined, the network control is performed, and the network processing flexibility of the terminal under the roaming condition is improved.

In another embodiment, the network side device indicates, through the first indication information, that the terminal is in a roaming condition, if the terminal executes the target service, the terminal falls back to the home network; furthermore, when the terminal is roaming, if the terminal initiates or executes the target service, the terminal actively drops back to the home network based on the indication of the first indication information, so as to avoid the problem of service interruption when the terminal roams to a roaming network with higher network generation.

In yet another embodiment, the network side device indicates, through the first indication information, whether the terminal determines whether to fall back to the home network based on the current location of the terminal in the case that the terminal is roaming. Further, when the terminal is roaming, if the first indication information indicates that the terminal is roaming, whether the terminal falls back to the home network is determined based on the current location of the terminal, and whether the terminal falls back to the home network is determined based on the current location of the terminal, for example, the terminal may be determined to fall back to the home network when the location of the terminal is located at the edge of the roaming network, and the terminal may still reside in the current cell covered by the roaming network when the current location of the terminal is not located at the edge of 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 position of the terminal under the roaming condition, the terminal does not determine whether to fall back to the home network based on the current position of the terminal, that is, the terminal does not determine whether to actively fall back to the home network based on the position. In this embodiment, the first indication information sent by the network side device enables the terminal to determine whether to fall back to the home network based on the current location, thereby ensuring control of the network on the terminal behavior.

In yet another embodiment, the network side device may further instruct, by the first instruction information, whether the terminal determines whether to fall back to the home network based on the mobility state of the terminal. Further, if the first indication information indicates that the terminal is roaming, the terminal determines whether to fall back to the home network based on the mobility state of the terminal, and the terminal determines whether to fall back to the home network based on the mobility state thereof, for example, the terminal may actively fall back to the home network when the mobility state of the terminal is a target mobility state (e.g., high mobility). Or 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 under the roaming condition, the terminal does not determine whether to fall back to the home network based on the mobility state of the terminal, that is, the terminal does not determine whether to actively fall back to the home network based on the mobility state. In this embodiment, the terminal is able to decide, based on the first indication information, whether to determine whether to fall back to the home network based on its mobility state, thereby ensuring control of the terminal behavior by the network.

Alternatively, the first indication information may also include any two or more combinations of the above four ways, which are not listed here too much.

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 time delay sensitive service, such as a call, video communication, and a time delay sensitive game. The target service may be pre-configured or protocol agreed or configured by the network side device, and if the target service is configured by the network side device, the configuration information may be carried by a non-access service (Non Access Stratum, NAS) message, a radio resource control (Radio Resource Control, RRC) dedicated message, or a broadcast message, and the configuration information includes a service identification.

Optionally, if the first condition includes that the service initiated by the terminal is the target service, the terminal falls back to the home network if the terminal meets the first condition, 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.

That is, when the terminal is roaming, once the terminal opens at least one of the dial, the address book and the application program corresponding to the target service, the terminal immediately drops back to the home network, so as to avoid the situation that the terminal executes the target service and/or the delay sensitive service under the roaming network and causes service interruption such as call drop and the like due to long delay, thereby ensuring smoothness of the terminal executing the target service and/or the delay sensitive service, and improving the terminal use experience of the user.

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

in case the terminal is in a radio resource control (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;

in the case that the terminal is in an RRC CONNECTED state (rrc_connected), the terminal performs cell selection or cell reselection to fall back to the home network after the roaming network releases the RRC connection and returns to an RRC idle state or an RRC inactive state.

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 comprises 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 the current roaming network covers the first cell, and determines whether to fall back to the home network according to whether the current position is located at the edge position of the roaming network or not based on whether the current roaming network covers the first cell.

For example, in one embodiment, the first message sent by the network side device includes a first threshold value used by the terminal to determine the location of the terminal, where the first threshold value may be a threshold value used to determine the service quality of the current cell in which the terminal is located, and if the service quality of the current cell in which the terminal is located is less than the first threshold value, and/or if the neighbor cell in which the terminal is located is only a cell under the home network, the location in which the terminal is located is considered to be located at an edge location of the roaming network, and then the terminal may select to fall back to the home network actively. Of course, the first message may further include a second threshold value and/or a first preset duration, and the terminal may determine whether the current location is located at an edge location of the roaming network based on at least one of the first threshold value, the second threshold value and the first preset duration, so as to determine whether the current location falls back to the home network.

In this way, the first message is sent by the network side device, so that the terminal can judge whether the current position is at the edge of the roaming network and the home network based on the first parameter included in the first message, thereby improving the accuracy of the terminal on position judgment.

In another embodiment, the terminal may determine whether the roaming network currently located covers the first cell, and if the first network currently located covers the first cell, the terminal determines whether the location currently located is located at an edge location 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 an edge location 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 without being based on whether the current location is located at an edge location of the roaming network. Of course, the terminal may also include other possible actions, which are not explicitly recited herein.

Optionally, the determining, by the terminal, whether the roaming network where the terminal is currently located covers the first cell includes:

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

For example, the terminal may determine whether the roaming network currently located covers the first cell based on GPS positioning information acquired by itself, or may determine whether the roaming network currently located covers the first cell based on network deployment information (e.g., network coverage information from a large data platform).

Optionally, 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.

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

It should be noted that the first cell may be preconfigured, predefined, agreed on a protocol, or determined based on a measurement quantity of the terminal itself, etc.

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

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 neighbor cells of the terminal only comprise cells covered by a home network;

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.

Specifically, the terminal determining whether the current location is located at the edge locations of the roaming network and the home network may include the following cases:

if the first quality parameter of the serving cell of the terminal is smaller than or equal to a first threshold value and/or the neighbor cell of the terminal only comprises a cell covered by the home network, the terminal determines that the current position is positioned at the edge position of the roaming network; if the first quality parameter of the serving cell of the terminal is greater than the first threshold value and/or a neighboring cell of the serving cell of the terminal has a cell covered by the roaming network identical to the serving cell network, the terminal determines that the current position is not located at the edge position of the roaming network.

If the first quality parameter of the adjacent cell is larger than or equal to the second threshold value, the terminal determines that the current position is positioned at the edge position of the roaming network; if the first quality parameter of the adjacent cell is smaller than the second threshold value, the terminal determines that the current position is not located at the edge position of the roaming network. The neighbor cell is a cell covered by the home network configured by the network side equipment.

And c, if the first quality parameter of the adjacent cell is larger than or equal to the second threshold value and the first quality parameter of the service cell is smaller than or equal to the first threshold value, the terminal determines that the current position is positioned at the edge position of the roaming network.

Optionally, in the case that the terminal meets the second condition, the determining, by the terminal, that the current location is located at the edge location of the roaming network includes:

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.

For example, if the first quality parameter of the serving cell of the terminal is less than or equal to the first threshold value and/or the neighbor cell of the serving cell of the terminal only includes a cell covered by the home network within the first preset duration, the terminal determines that the current location is located at an edge location of the roaming network; if the first quality parameter of the serving cell of the terminal is greater than a first threshold value and/or the neighbor cell of the serving cell of the terminal has a cell covered by the roaming network which is the same as the network of the serving cell within a first preset time period, the terminal determines that the current position is not located at the edge position of the roaming network.

Or if the first quality parameter of the adjacent cell is greater than or equal to the second threshold value within the first preset duration, the terminal determines that the current position is positioned at the edge position of the roaming network; if the first quality parameter of the adjacent cell is smaller than the second threshold value within the first preset duration, the terminal determines that the current position is not located at the edge position of the roaming network.

Or if the first quality parameter of the adjacent 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 within the first preset duration, the terminal determines that the current position is located at the edge position of the roaming network; if the first quality parameter of the adjacent cell is smaller than the second threshold value and the first quality parameter of the service cell is larger than the first threshold value within the first preset time length, the terminal determines that the current position is not located at the edge position of the roaming network.

Optionally, the first threshold value is pre-configured or network side equipment configuration or protocol convention; the second threshold value is pre-configured or network side equipment configuration or protocol convention; the first preset duration is preset or network side equipment configuration or protocol convention.

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

a cell selection reception level value (cell selection receive level value, srxlev);

cell selection quality value (cell selection quality value, square);

reference signal received power (Reference Signal Received Power, RSRP) of layer 3 or RSRP of layer 1;

reference signal received quality of layer 3 (Reference Signal Received Quality, RSRQ) 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 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.

That is, the terminal may determine its mobility state based on its subscription parameter, or determine its mobility state according to the second information sent by the network side device, specifically, the terminal determines whether an attribute parameter for characterizing mobility of the terminal is greater than a preset threshold, and further determines whether to fall back to the home network according to the determined mobility state.

For example, if the mobility state of the terminal is a target mobility state (e.g., high mobility), the terminal may choose to proactively fall back to the home network; if the mobility state of the terminal is low mobility or fixed, the terminal may still camp on the current cell.

Optionally, the second information sent by the network side device includes a second parameter for judging a mobility state of the terminal, where 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 may be a threshold for determining the current service quality of the terminal, for example, if the change value of the service quality of the terminal in the second preset duration is greater than the third threshold, the current mobility state of the terminal may be considered as high mobility, and then the terminal may select to fall back to the home network. Therefore, the terminal can judge the mobility state of the terminal based on the second parameter carried in the second information sent by the network side equipment, and a judgment reference is provided for the terminal, so that the judgment accuracy of the terminal on the mobility state of the terminal is improved.

Optionally, the determining, by the terminal, the mobility state according to the change value of the quality of service in the second preset duration includes determining that the mobility state of the terminal is a target mobility state, for example, a high mobility state, in a case where the current quality of service of the terminal is lower than a reference quality and a difference between the current quality of service of the terminal and the reference quality is greater than the third threshold value.

Optionally, in case a second condition is met, the reference quality is a quality of service of the current serving cell, 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.

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

The second preset time length is preset or network side equipment configuration or protocol convention; the third threshold value is pre-configured or network side equipment configuration or protocol convention.

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

Srxlev；

Squal；

RSRP for layer 3 or RSRP for layer 1;

RSRQ for layer 3 or RSRQ for layer 1.

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

in the event that a 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 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.

Optionally, 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.

It should be noted that the first cell may be preconfigured, predefined, agreed on a protocol, or determined based on a measurement quantity of the terminal itself, etc. .

Specifically, the period of time of residence of the terminal in the home network being greater than or equal to a third preset period of time includes that the period of time of residence of the terminal in the home network after the last time the target service has been executed by the home network is greater than or equal to the third preset period of time.

Several of the cases covered by the third condition are described below.

For example, if the network 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 may roam from the home network to the network a, and thus perform related services in network a.

Or if the residence time of the terminal in the home network reaches the third preset time after the last voice service and/or the time delay sensitive service is executed by the home network, the terminal can also select the network roaming to the EPLMN list. The third preset time length is greater than or equal to 0, and the third preset time length can be configured or agreed by a network side device or predefined by a protocol.

Or if the signal quality of the cell covered by the network a in the EPLMN list meets the requirement of the terminal for cell selection or cell reselection, the terminal may roam to the network a.

Or if the terminal is moving, the network a in the EPLMN list covers the first cell. The terminal may roam to said network a. Specifically, the first cell includes a tracking area of a terminal, a notification area based on a wireless access network, or a preset value of square meter/square kilometer/acre/hectare, etc.; the first cell may be preconfigured, predefined, agreed on protocol, or determined based on a terminal implementation.

Alternatively, the scenario in which the terminal roams into a network in the EPLMN list may also be a combination comprising several of the above, not too much.

For a better understanding of the technical solutions provided in the present application, the following description will be given by way of example with reference to several specific examples.

Example 1

When the operator to which the HPLMN of the UE belongs does not support the 5G service, but one EPLMN belongs to the other operator and supports the 5G service, the UE selects to roam into the network of the operator supporting the 5G service, that is, the UE selects the EPLMN supporting the 5G.

When the UE initiates a voice service or executes a delay sensitive service, for example, when the terminal opens a dial, or the terminal opens an address book, or the terminal opens an application corresponding to the voice service or the delay sensitive service, the terminal immediately and actively returns to the network to which the HPLMN belongs.

When the UE is in the rrc_idle state or the rrc_inactive state, the UE actively returning to the HPLMN home network includes the UE performing cell selection or cell reselection, that is, the UE performs cell selection or cell reselection to fall back to the HPLMN home network.

When the UE is in the rrc_connected state, the UE actively returning to the HPLMN home network includes the UE releasing the RRC connection in the roaming network, returning to the rrc_idle state or the rrc_inactive state, and performing cell selection or cell reselection to fall back to the HPLMN home network.

And when the terminal performs cell selection or cell reselection, selecting a cell covered by the home network.

Example two

And under the roaming condition, the UE decides whether to actively return to the network to which the HPLMN belongs according to the current location area of the UE. For example, the UE decides whether to return to the HPLMN home network according to the 5G coverage of the current area. Specifically, the UE determines the 5G coverage situation of the current location of the UE, and decides whether to actively return to the network to which the HPLMN belongs according to the 5G coverage situation of the current location of the UE.

The UE determines a 5G coverage condition of a current location of the UE, where the 5G coverage condition includes one or more of the following:

the UE decides whether to actively return to the network to which the HPLMN belongs according to whether the current position of the UE is positioned at the cell boundary of the roaming network, wherein the cell boundary is the position where the edge positions of the cell contained in the 4G network of the HPLMN and the cell contained in the roaming 5G network intersect;

the UE determines whether it is located at the coverage boundary of the roaming 5G network based on statistical location information local to the terminal, such as location information obtained by global positioning system (Global Positioning System, GPS) data or other positioning means, and network deployment information, such as network coverage information from a large data platform.

Optionally, the determining, by the UE, whether to actively return to the HPLMN home network according to the 5G coverage condition of the current location of the UE includes:

if the UE determines that the current position of the UE is positioned at the coverage boundary or the cell boundary of the 5G network, the UE actively returns to the network to which the HPLMN belongs;

if the UE judges that the current position of the UE is not located at the coverage boundary or the cell boundary of the 5G network, the UE still resides in the current cell.

Further, the precondition that the UE decides whether to actively return to the HPLMN home network according to the 5G coverage condition of the current location of the UE includes any one or more of the following:

the method comprises the steps that 1, UE receives first indication information sent by network side equipment, wherein the first indication information indicates whether the UE can actively return to a network to which an HPLMN belongs according to the 5G coverage condition of the current position of the UE;

the UE receives a first message sent by network side equipment, wherein the first message comprises parameters for judging the 5G coverage condition of the UE, and the parameters comprise one or more of the following: a. a first threshold value, b. a first preset duration;

3. when the communication mode of the home network of the UE (such as 4G/LTE/E-UTRAN) is behind the communication mode of the roaming network (such as 5G/NR), the UE determines the current location area.

In this embodiment, the method for determining, by the UE, whether the current location is located at a cell boundary includes one or more of:

1. if the quality of the serving cell of the UE is lower than or equal to a first threshold value, the UE considers that the UE is at the cell boundary; otherwise, the UE considers that the UE is not at the cell boundary;

2. if the quality of the serving cell of the UE is lower than or equal to a first threshold value within a first preset duration, the UE considers that the UE is at a cell boundary; otherwise, the UE considers that the UE is not at the cell boundary;

3. if the quality of the adjacent cell is higher than or equal to the second threshold value, the UE considers that the UE is at the cell boundary; otherwise, the UE considers that the UE is not at the cell boundary;

4. if the quality of the adjacent cell is higher than or equal to a second threshold value within the first preset time length, the UE considers that the UE is at the cell boundary; otherwise, the UE considers that the UE is not at the cell boundary;

5. if the quality of the neighbor 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, the UE considers that the UE is at the cell boundary; otherwise, the UE considers that the UE is not at the cell boundary;

6. if the quality of the neighbor cell is higher than or equal to a second threshold value and the quality of the serving cell is lower than or equal to a first threshold value within a first preset duration, the UE considers that the UE is at a cell boundary; otherwise the UE considers itself not to be at the cell border.

7. The neighbor cells of the serving cell of the terminal are only cells covered by the home network.

Wherein the quality of the serving cell or the quality of the neighbor cell comprises one or more of:

Srxlev；

Squal；

RSRP for layer 3 or RSRP for layer 1;

RSRQ for layer 3 or RSRQ for layer 1.

The first threshold value, the second threshold value and the first preset duration may be configured or preconfigured by the network side device or agreed by a protocol.

The neighbor cell is a cell covered by the home network configured by the network side equipment.

Example III

In the case of roaming, the UE decides whether to actively return to the HPLMN home network according to its own mobility.

Wherein the UE deciding whether to actively return to the HPLMN home network according to its own mobility includes:

a. if the UE judges that the UE is not low-mobility, the UE actively returns to the network to which the HPLMN belongs, wherein the network comprises;

b. if the UE determines itself to be low mobility, the UE remains camped on the current cell.

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

the UE judges whether the UE meets the low mobility or fixed criterion or not;

and b, the UE judges the mobility of the UE according to the subscription parameters of the UE.

Optionally, the condition that the UE decides whether to actively return to the HPLMN home network according to its mobility includes any one of the following:

The method comprises the steps that UE receives first indication information sent by network side equipment, wherein the first indication information indicates whether the UE can actively return to a network to which an HPLMN belongs according to the self mobility of the UE;

the UE receives a second message sent by the network side equipment, wherein the second message comprises a parameter for judging the mobility of the UE, and the parameter comprises at least one of a third threshold value and a second preset duration.

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

if the difference between the current quality of service of the UE and the reference quality is less than or equal to a third threshold value, the UE meets a low mobility or fixity criterion; otherwise the UE does not meet the low mobility or fixed criteria.

Wherein the reference quality is a quality of a current serving cell in any of the following cases:

the UE selects or reselects to a new cell;

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

c. the mobility state of the UE does not meet the low mobility or fixed criteria for a second preset duration.

The second preset duration can be configured or preconfigured or agreed by the network side equipment.

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

Srxlev；

Squal；

RSRP for layer 3 or RSRP for layer 1;

RSRQ for layer 3 or RSRQ for layer 1.

Example IV

Under the roaming condition, the UE decides whether to actively return to the network to which the HPLMN belongs according to the current location area of the UE and the mobility of the UE. For example, the UE determines a 5G coverage condition of a location area where the UE is currently located and the UE determines mobility of the UE, if the UE is not located at a coverage boundary of the 5G network or a cell boundary or a tracking area of the UE has coverage of a roaming network and is also low mobility, the UE still resides in the current cell; otherwise the UE actively returns to the HPLMN home network.

The conditions for the UE to decide whether to actively return to the HPLMN home network according to the location area where the UE is currently located and according to its mobility include any one of the following:

the method comprises the steps that a UE receives first indication information sent by network side equipment, wherein the first indication information indicates whether the UE can actively return to a network to which an HPLMN belongs according to a current location area of the UE and according to mobility of the UE;

the UE receives a third message sent by the network side, where the third message includes a parameter that the UE determines the location area of the UE and a parameter that the UE determines the mobility of the UE, and specifically reference may be made to the parameter included in the first message in the second embodiment and the parameter included in the second message in the third embodiment, which are not described herein again.

Example five

Under the roaming condition, the UE decides whether to actively return to the HPLMN home network according to whether the current location area is positioned at the cell boundary and the execution condition of voice service or time delay sensitive service, including the 5G coverage condition of the location area where the UE is determined.

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

Example six

And under the roaming condition, the UE decides whether to actively return to the HPLMN home network according to the mobility of the UE and the execution condition of voice service or time delay sensitive service, including the UE determining the mobility of the UE.

For example, if the UE determines that it is not low mobility (the determination method is described in embodiment three), the UE actively returns to the HPLMN home network when the UE initiates voice traffic or delay sensitive traffic.

Example seven

Under the roaming condition, the UE decides whether to actively return to the HPLMN home network according to the current location area of the UE, the mobility of the UE and the execution condition of voice service or time delay sensitive service, including the UE determining the 5G coverage condition of the location area of the UE and the mobility of the UE.

For example, if the UE determines that it is not low mobility and the UE determines that the current location of the UE is located at the coverage boundary of the 5G network or the cell boundary or the tracking area of the UE does not have coverage of a continuous roaming network, when the UE initiates a voice service or a delay sensitive service, the UE actively returns to the network to which the HPLMN belongs.

Example eight

The UE roams from the HPLMN network to a network in the EPLMN list when one or more of the following conditions are met:

in the EPLMN list, the network communication system of the EPLMN-A is higher than that of the current HPLMN; for example, EPLMN-A is A5G network and HPLMN is A4G network;

after the last voice service or the time delay sensitive service is executed by the HPLMN, the residence time of the UE in the HPLMN reaches the preset time; the preset time length is more than or equal to 0, and can be set by network side equipment configuration or protocol;

the signal quality of the cell covered by the EPLMN-A meets the condition of cell selection or cell reselection;

4, the network communication system corresponding to the EPLMN-A has continuous coverage at the position of the UE; for example, the location areas where the UE moves are all located within the 5G network coverage of EPLMN-A.

Referring to fig. 3, fig. 3 is a flowchart of another roaming fallback method according to an embodiment of the present application, as shown in fig. 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:

Optionally, the target traffic comprises at least one of voice traffic and delay sensitive traffic.

In the embodiment of the invention, the network side equipment can send the first indication information to the terminal, the first indication information can indicate whether the terminal is in the roaming condition, whether the terminal falls back to the home network is determined based on the execution target service, the position where the terminal is located and the mobility state, so that the problem that the terminal service is interrupted if the roaming network is not fully covered under the condition that the terminal roams to the roaming network with higher network generation number is avoided, and the terminal can actively fall back to the home network to ensure the smoothness of the terminal service, and ensure the smooth communication of the terminal.

Optionally, 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.

Optionally, 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.

It should be noted that, in the roaming fallback method provided in the embodiment of the present application, the execution body is a network side device, and corresponding to the roaming fallback method executed by the terminal, the related concepts and specific implementation processes related to the embodiment of the present application may be described in the embodiment of the method described in reference to fig. 2, and in order to avoid repetition, the description is omitted here.

According to the roaming fallback method provided by the embodiment of the application, the execution main body can be a roaming fallback device. In the embodiment of the present application, a method for executing roaming fallback by using a roaming fallback device is taken as an example, and the roaming fallback device provided in the embodiment of the present application is described.

Referring to fig. 4, fig. 4 is a block diagram of a roaming-back device according to an embodiment of the present application, and as shown in fig. 4, a roaming-back device 400 includes:

a fallback module 401, configured to, in a case where the device roams, fallback to the home network if the device meets a first condition;

the service initiated by the device is a target service;

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

Optionally, 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.

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:

in the event that the device opens the dial, fall back to the home network;

under the condition that the device opens the address book, the device falls back to the home network;

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

Optionally, the fallback module 401 is further configured to perform any one of the following:

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.

Optionally, the apparatus further comprises a determining module for performing 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 used for judging the 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.

Optionally, the determining module is further configured to:

determining whether the roaming network currently located covers the first cell based on global positioning system, GPS, positioning information and/or network deployment information.

Optionally, 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.

Optionally, the determining module is further configured to:

if the device meets the second condition, determining that the current position is located 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;

Optionally, the determining module 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.

Optionally, the first quality parameter includes 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.

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.

Optionally, the second information includes a second parameter for determining a mobility state of the device, where the second parameter includes at least one of a third threshold value and a second preset duration.

Optionally, in a case where the current quality of service of the apparatus is lower than a reference quality and a difference between the current quality of service of the apparatus and the reference quality is greater than the third threshold, the mobility state of the apparatus is a target mobility state.

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

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

Optionally, 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 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;

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

In this embodiment of the present application, the device may fall back to the home network when the first condition is satisfied under the roaming condition, so that the problem that if the roaming network is not fully covered and the service of the device is interrupted under the condition that the device roams to the roaming network of a higher network generation, the device actively falls back to the home network to ensure the smoothness of the service, and ensure smooth communication of the device.

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

The roaming fallback device 400 provided in the embodiment of the present application can implement each process implemented by the terminal in the embodiment of the method of fig. 2, and achieve the same technical effects, so that repetition is avoided, and no further description is provided here.

Referring to fig. 5, fig. 5 is a block diagram of another apparatus for roaming fallback according to an embodiment of the present application, and as shown in fig. 5, an apparatus 500 for roaming fallback includes:

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

Optionally, the sending module 501 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.

Optionally, the sending module 501 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.

In this embodiment of the present invention, the device may send first indication information to the terminal, where the first indication information may indicate whether the terminal is roaming, and whether the terminal is falling back to the home network is determined based on the execution target service, the location where the terminal is located, and the mobility state, so as to avoid the problem that if the terminal is roaming to a roaming network with a higher network generation, the roaming network is not fully covered, and thus the terminal may actively fall back to the home network to ensure smoothness of the terminal service, and ensure smooth communication of the terminal.

Optionally, as shown in fig. 6, the embodiment of the present application further provides a communication device 600, including a processor 601 and a memory 602, where the memory 602 stores a program or instructions that can be executed on the processor 601, for example, when the communication device 600 is a terminal, the program or instructions implement the steps of the foregoing roaming fallback method embodiment when executed by the processor 601, and achieve the same technical effects. When the communication device 600 is a network side device, the program or the instruction, when executed by the processor 601, implements the steps of the above-described embodiments of the method for roaming fallback, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the processor is used for falling back to a home network if the terminal meets a first condition under the roaming 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 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. The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment, and the same technical effects can be achieved. Specifically, fig. 7 is a schematic hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 700 includes, but is not limited to: at least some of the components of the radio frequency unit 701, the network module 702, the audio output unit 703, the input unit 704, the sensor 705, the display unit 706, the user input unit 707, the interface unit 708, the memory 709, and the processor 710.

Those skilled in the art will appreciate that the terminal 700 may further include a power source (e.g., a battery) for powering the various components, and that the power source may be logically coupled to the processor 710 via a power management system so as to perform functions such as managing charging, discharging, and power consumption via the power management system. The terminal structure shown in fig. 7 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine certain components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 704 may include a graphics processing unit (Graphics Processing Unit, GPU) 7041 and a microphone 7042, with the graphics processor 7041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 706 may include a display panel 7061, and the display panel 7061 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 at least one of a touch panel 7071 and other input devices 7072. The touch panel 7071 is also referred to as a 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, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In this embodiment, after receiving downlink data from the network side device, the radio frequency unit 701 may transmit the downlink data to the processor 710 for processing; in addition, the radio frequency unit 701 may send uplink data to the network side device. Typically, the radio unit 701 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 709 may be used to store software programs or instructions and various data. The memory 709 may mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 709 may include volatile memory or nonvolatile memory, or the memory 709 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 709 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

Processor 710 may include one or more processing units; optionally, processor 710 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, and the like, and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 710.

The processor 710 is configured to, in a roaming situation, fall back to the home network if the terminal meets a first condition;

the service initiated by the terminal is a target service;

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

In the embodiment of the invention, the terminal can fall back to the home network when the terminal meets the first condition under the roaming condition, so that the problem that the terminal service is interrupted if the roaming network is not fully covered under the condition that the terminal roams to the roaming network of higher network generation times can be avoided, and further the terminal actively falls back to the home network to ensure the smoothness of the terminal service, ensure the smooth communication of the terminal and improve the user experience.

Specifically, the embodiment of the application also provides network side equipment. 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 a radio frequency device 82. In the uplink direction, the radio frequency device 82 receives information via the antenna 81, and transmits the received information to the baseband device 83 for processing. In the downlink direction, the baseband device 83 processes information to be transmitted, and transmits the processed information to the radio frequency device 82, and the radio frequency device 82 processes the received information and transmits the processed information through the antenna 81.

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

The baseband device 83 may, for example, include at least one baseband board, where a plurality of chips are disposed, as shown in fig. 8, where one chip, for example, a baseband processor, is connected to the memory 85 through a bus interface, so as to call a program in the memory 85 to perform the network device operation shown in the above method embodiment.

The network-side device may also include a network interface 86, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network side device 800 of the embodiment of the present invention further includes: instructions or programs stored in the memory 85 and executable on the processor 84, the processor 84 invokes the instructions or programs in the memory 85 to perform the method performed by the modules shown in fig. 5, and achieve the same technical effects, and are not repeated here.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and the program or the instruction when executed by a processor implement each process of the method embodiment of fig. 2 or implement each process of the method embodiment of fig. 3, and the same technical effects can be achieved, so that repetition is avoided and no further description is given here.

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

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction, implement each process of the method embodiment described in fig. 2, or implement each process of the method embodiment described in fig. 3, and achieve the same technical effect, so that repetition is avoided, and no further description is given here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product stored in a storage medium, where the computer program/program product is executed by at least one processor to implement the respective processes of the method embodiment described above in fig. 2, or implement the respective processes of the method embodiment described above in fig. 3, and achieve the same technical effects, so that repetition is avoided and a detailed description thereof is omitted herein.

The embodiment of the application also provides a communication system, which comprises: a terminal and a network side device, the terminal being operable to perform the steps of the method as described in fig. 2, the network side device being operable to perform the steps of the method as described in fig. 3 above.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A method of roaming fallback comprising:

the service initiated by the terminal is a target service;

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:

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:

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 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:

the second condition includes at least one of:

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:

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:

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;

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:

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

17. A method of roaming fallback comprising:

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:

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

21. An apparatus for roaming back, comprising:

the service initiated by the device is a target service;

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

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

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

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

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;

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:

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

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

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

wherein the third condition includes at least one of:

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

29. An apparatus for roaming back, comprising:

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

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

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.