CN106063327B

CN106063327B - Method and terminal for processing voice service

Info

Publication number: CN106063327B
Application number: CN201480074599.1A
Authority: CN
Inventors: 金辉; 于亚军; 宋昊; 封鹏飞; 段小嫣
Original assignee: Huawei Technologies Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2014-10-16
Filing date: 2014-10-16
Publication date: 2020-04-14
Anticipated expiration: 2034-10-16
Also published as: CN106063327A; WO2016058164A1

Abstract

A method for processing voice service, the method comprises a terminal sending a first message for requesting a CSFB voice service (102); the terminal receiving a second message comprising information of the first network, the information being used for the terminal to redirect from a current network to the first network supporting CS voice service, the current network being different from the first network (104); the terminal acquires a cell ID (106) of a target cell of the first network according to the information; and the terminal judges whether a preset condition is met or not according to the cell ID, and if so, sends a connection request to a base station of a second network supporting CS voice service so as to establish CS connection, wherein the first network is different from the second network (108). The method can realize the selective access to the second network according to the preset condition when the terminal is redirected, and enhances the call processing capability of the terminal.

Description

Method and terminal for processing voice service

Technical Field

The present invention relates to the field of communications, and in particular, to a method and a terminal for processing a voice service.

Background

Wireless mobile communication networks have undergone an evolution from a second Generation mobile communication system (2nd Generation mobile communication technology, 2G), a third Generation mobile communication system (3rd Generation mobile communication technology, 3G) to a fourth Generation mobile communication system (4th Generation mobile communication technology, 4G). The fourth generation mobile communication system adopts Long Term Evolution (LTE) Access technology, and its Access Network is called Evolved universal terrestrial Radio Access Network (E-UTRAN). In second and third generation mobile communication systems, conventional services such as voice are provided by a Circuit Switched (CS) domain. Since the fourth generation mobile communication system has only a Packet Switch (PS) domain, there is no CS domain. Therefore, a mechanism is needed to implement traditional services such as voice.

CSFB (Circuit Switch Fallback) is a solution for LTE voice services. CSFB is a technology that enables an LTE terminal (UE) to perform voice or short message service via GSM or other circuit-switched networks. For example, an LTE multimode terminal normally resides in E-UTRAN, and when there is a voice service requirement, the terminal may fall back to a 2G/3G CS network from LTE, and establish the voice service in the 2G/3G CS network. However, currently, when the terminal falls back to the first network, such as 3G, from the current network, such as LTE, according to the policy of the operator, if the first network is poor, resulting in poor call quality, the terminal needs to be further switched to the second network, such as 2G, for call. Currently, there is no effective solution to the above situation.

Disclosure of Invention

The embodiment of the invention provides a method and a terminal for processing a call, which can enhance the call processing capability of the terminal.

In a first aspect, an embodiment of the present invention provides a method for processing a call, where the method includes:

a terminal sends a first message, wherein the first message is used for requesting a CSFB voice service;

the terminal receives a second message, wherein the second message comprises information of a first network, and the information is used for redirecting the terminal from a current network to the first network supporting CS voice service, and the current network is different from the first network;

the terminal acquires the cell ID of the target cell of the first network according to the information;

and the terminal judges whether a preset condition is met or not according to the cell ID, and if so, the terminal sends a connection request to a base station of a second network supporting CS voice service so as to establish CS connection, wherein the first network is different from the second network.

With reference to the first aspect, in a first implementation manner, the preset condition includes at least one of:

the cell ID belongs to a cell list stored in the terminal, and the cell list is used for storing the cell ID of the first network when the terminal is switched from the first network to the second network, and the switching comprises reselection, redirection or switching;

the signal of the second network of the current network environment is better than the signal of the first network;

the second network is pre-configured for preference.

With reference to the first implementation manner of the first aspect, in a second implementation manner, the method further includes: and updating the cell list, and deleting the cell ID of the target cell exceeding the validity period in the cell list.

With reference to the first implementation manner of the first aspect, in a third implementation manner, the performing, by the network environment, a signal of the second network better than a signal of the first network includes:

the signal strength of the first network of the cell ID is less than a threshold M, the signal strength of the second network is greater than a threshold N, and N is greater than or equal to M.

With reference to any one implementation manner of the first aspect to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the obtaining, by the terminal according to the second message, a cell ID of a target cell of the first network, where the cell ID is a cell global ID or a cell physical ID, includes:

the terminal at least acquires system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the information, and acquires the cell global ID of the target cell of the first network from the system information; or

The terminal obtains the cell global ID of the target cell of the first network from the system information of the target cell of the first network in the information; or

The terminal obtains the cell physical ID of the target cell of the first network from the information.

With reference to any one implementation manner of the first aspect to the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the sending a connection request to a base station of the second network includes:

and the terminal searches the accessible frequency point of the second network and sends the connection request to the base station of the second network according to the frequency point.

In a second aspect, an embodiment of the present invention provides a terminal, where the terminal includes:

a sending module, configured to send a first message, where the first message is used to request a CSFB voice service;

a receiving module, configured to receive a second message, where the second message includes information of a first network, and the information is used for the terminal to redirect from a current network to the first network supporting a CS voice service, where the current network is different from the first network;

an obtaining module, configured to obtain a cell ID of a target cell of the first network according to the information;

and the processing module is used for judging whether preset conditions are met or not according to the cell ID, and if so, sending a connection request to a base station of a second network supporting CS voice service so as to establish CS connection, wherein the first network is different from the second network.

With reference to the second aspect, in a first implementation manner, the preset condition includes at least one of:

the terminal further comprises a storage module, wherein the cell ID belongs to a cell list stored in the storage module, and the cell list is used for storing the cell ID of the first network when the terminal is switched from the first network to the second network, and the switching comprises reselection, redirection or switching;

the second network is pre-configured for preference.

With reference to the first implementation manner of the second aspect, in a second implementation manner, the storage module updates the cell list, and deletes a cell ID of a target cell exceeding a validity period in the cell list.

With reference to the first implementation manner of the second aspect, in a third implementation manner, the signal of the second network of the current network environment is better than the signal of the first network, and the method includes:

With reference to any one implementation manner of the second aspect to the third implementation manner of the second aspect, in a fourth implementation manner of the second aspect, the cell ID is a cell global ID or a cell physical ID, and the obtaining module is specifically configured to:

at least according to the frequency point of the target cell of the first network in the information, acquiring system information corresponding to the frequency point, and acquiring the cell global ID of the target cell of the first network from the system information; or

Obtaining a cell global ID of a target cell of the first network from target cell system information of the first network in the information; or

Obtaining a cell physical ID of a target cell of the first network from the information.

With reference to any one implementation manner of the second aspect to the fourth implementation manner of the second aspect, in a fifth implementation manner of the second aspect, the processing module is specifically configured to:

searching the accessible frequency point of the second network, and sending the connection request to the base station of the second network according to the frequency point.

In a third aspect, an embodiment of the present invention provides a processor, where the processor is configured to perform the following operations:

sending a first message, wherein the first message is used for requesting a CSFB voice service;

receiving a second message, wherein the second message comprises information of a first network, and the information is used for redirecting the terminal from a current network to the first network supporting CS voice service, and the current network is different from the first network;

acquiring a cell ID of a target cell of the first network according to the information;

and judging whether a preset condition is met or not according to the cell ID, if so, sending a connection request to a base station of a second network supporting CS voice service so as to establish CS connection, wherein the first network is different from the second network.

With reference to the third aspect, in a first implementation manner, the preset condition includes at least one of:

the cell ID belongs to a stored cell list for storing cell IDs of the first network when transitioning from the first network to the second network, the transitioning including reselection, redirection, or handover;

the second network is pre-configured for preference.

With reference to the first implementation manner of the third aspect, in a second implementation manner, the processor is further configured to update the cell list, and delete a cell ID of a target cell in the cell list, which exceeds a validity period.

With reference to the first implementation manner of the third aspect, in a third implementation manner, the signal of the second network of the current network environment is better than the signal of the first network, including:

With reference to any one implementation manner of the third aspect to the third implementation manner of the third aspect, in a fourth implementation manner of the third aspect, the obtaining the cell ID of the target cell of the first network according to the information includes:

With reference to any one implementation manner of the third aspect to the fourth implementation manner of the third aspect, in a fifth implementation manner of the third aspect, the sending a connection request to the second network includes:

In a fourth aspect, an embodiment of the present invention provides a terminal, including: the processor, the transceiver, the memory, and the bus of any one of the third to fifth implementations of the third aspect, the processor, the transceiver, and the memory of any one of the third to fifth implementations of the third aspect communicating over the bus;

the memory is to store instructions;

the transceiver is configured to receive a second message and send the second message to the processor, where the second message includes information of a first network, and the information is used for the terminal to redirect from a current network to the first network supporting CS voice service, where the current network is different from the first network;

the transceiver is further configured to send a connection request to a base station of the second network according to control of the processor, so as to establish a CS connection.

The scheme provided by the embodiment of the invention obtains the cell ID of the target cell of the first network through the information of the first network included in the second message, and sends the connection request to the base station of the second network when the preset condition is judged to be met according to the cell ID, so that the terminal can be selectively accessed to the second network according to the preset condition when being redirected, and the call processing capability of the terminal is enhanced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed in the prior art or the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a network system according to an embodiment of the present invention;

fig. 2 is a schematic flowchart of a method for processing a voice service according to embodiment 1 of the present invention;

fig. 3 is a schematic diagram of signaling interaction for processing a voice service according to embodiment 2 of the present invention;

fig. 4 is a schematic structural diagram of a terminal for processing a voice service disclosed in embodiment 3 of the present invention;

fig. 5 is a schematic diagram of a hardware structure of a terminal for processing a voice service according to embodiment 4 of the present invention;

fig. 6 is a schematic block diagram of a processor disclosed in embodiment 5 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide an understanding of the present invention. It will be understood by those skilled in the art, however, that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, and the like have not been described in detail so as not to unnecessarily obscure the embodiments. It is to be understood that the embodiments described below are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In some of the flows described below, operations are included in a particular order, but it should be understood that the operations may be performed out of order or in parallel as they appear herein, with the order of the operations, e.g., 102, 104, etc., merely to distinguish one operation from another, and the order of the operations by themselves is not intended to represent any order of performance. Additionally, the flows may include more or fewer operations, and the operations may be performed sequentially or in parallel.

It should be noted that, the descriptions of "first", "second", etc. in this document are used to distinguish different messages, devices, modules, networks, etc., and do not represent a sequential order, nor limit the types of "first" and "second" to be different. The term "if" used herein means that a certain condition or state is satisfied, and includes the meanings of "when", "after the condition is satisfied", "judgment is satisfied", and the like. A "message" is a carrier that carries a number of information, including signaling, communication signals, data messages, and the like in a variety of forms.

It should be understood that a terminal according to the present invention may also be referred to as a User Equipment (UE), and the terminal may communicate with one or more core networks through a Radio Access Network (RAN). The terminal may be a mobile terminal, e.g. a mobile phone or other computer equipment with mobile communication capabilities, etc., e.g. a portable, hand-held, computer-included or vehicle-mounted mobile device, which exchanges voice and/or data with a radio access network. In addition, the terminal according to the present invention may be a processor or a processor with necessary auxiliary circuits and auxiliary devices (e.g., rf chip).

Note that redirection means that the terminal disconnects from the current network and reconnects to another network. The redirection is a process that the terminal firstly disconnects from the network and then is in a connection state. For example: when the terminal uses the current network to perform voice service, the terminal disconnects the current network due to various factors, such as poor signal of the current network or the current network does not support related services, and reconnects to other networks to continue the service. When the reselection is an idle state (idle), the terminal is connected to another network from the attached network, and if the terminal reselects from the first network to the second network, the terminal may be in the idle state due to the fact that the first network is not well connected to the second network. Handover is the connection of a network to another network by a connection attachment network when the terminal is in a connected state. The terminal is not disconnected with the network in the switching process, is always in a connected state, and is different from the redirected terminal which is firstly disconnected with the attached network and then connected with another network.

Fig. 1 is a schematic diagram of a network system according to an embodiment of the present invention. The communication Network architecture typically includes a UE, a Radio Access Network (RAN) and a Core Network (CN). The RAN provides a radio access technology through which the UE connects to the CN.

An Evolved Node B (eNodeB or eNB) is a base station in LTE and belongs to a device in a 4G RAN. Compared with the Node B in the existing 3G, the eNB integrates the functions of part of Radio Network Controllers (RNCs), and reduces the protocol level during communication. The functions of the eNB include: a Radio Resource Management (RRM) function; selecting a Mobility Management Entity (MME) when the UE is attached; scheduling transmission of paging information; scheduling transmission of broadcast information; and setting and providing measurements of the eNB, etc.

The MME is a key control node of the third Generation Partnership Project (3 GPP) protocol LTE access network, belonging to a device in the 4G CN. It is responsible for idle mode UE location, paging procedure. In brief, the MME is responsible for the signaling processing part. The functions of the MME include access control, including security and admission control; mobility management, which supports a user access network with E-UTRAN capability and ensures the tracking and recording of the MME to the current position of the UE; a session management function, including establishment, modification, and release of an Evolved Packet Core (EPC) bearer; establishment and release of bearers with the access network, etc.

A Radio Network Subsystem (RNS) belongs to a 3G RAN, such as a device in a universal mobile telecommunications system Terrestrial Radio Access Network (UTRAN). The RNS includes a Radio Network Controller (RNC) that controls Radio resources in the access Network. The RNC has macro diversity combining capability and may provide soft handover capability. Each RNC may cover multiple nodebs. A NodeB is essentially a logical entity, equivalent to a base transceiver station, which is controlled by the RNC and provides a physical radio link connection between the UE and the Radio Network Subsystem (RNS).

A Base Station Subsystem (BSS), also called Base Station equipment, is an important component of a Global System for Mobile Communication (GSM) System, and belongs to a 2G RAN, such as equipment in a GSM/enhanced data rate GSM evolution Radio Access Network (GSM EDGE Radio Access Network, GERAN). The Base Station subsystem includes a Base Transceiver Station (BTS), a Base Station Controller (BSC), and the like. The BSS is the most direct basic component of the mobile communication system in relation to the wireless cellular network. In the whole mobile network, the base station of the BSS mainly plays a role of relay. The base station is connected with the base station by adopting a wireless channel and is responsible for wireless transmission, reception and wireless resource management. The main base station and the Mobile Switching Center (MSC) are usually connected by a wired channel to realize communication between mobile subscribers or between a mobile subscriber and a fixed subscriber.

MSCs are devices in 2G/3G CNs. The MSC may provide an interface function with a fixed network such as a public switched telephone network, an integrated services digital network, a public data network, etc. directly or through a gateway mobile switching center, and may interconnect a mobile subscriber with a mobile subscriber, and a fixed network subscriber.

The embodiment 1 of the invention provides a method for processing voice service. As shown in fig. 2, the method 100 may be performed by a terminal. The method 100 comprises:

102, a terminal sends a first message, wherein the first message is used for requesting a circuit switched fallback CSFB voice service;

104, the terminal receiving a second message, the second message including information of a first network, the information being used for the terminal to redirect from a current network to the first network supporting circuit switched, CS, voice service, the current network being different from the first network;

106, the terminal obtains the cell ID of the target cell of the first network according to the information;

and 108, the terminal judges whether a preset condition is met according to the cell ID, and if so, sends a connection request to a base station of a second network supporting CS voice service so as to establish CS connection, wherein the first network is different from the second network.

It should be understood that the current network and the first network each represent different networks, such as the current network representing a 4G network and the first network representing a 3G network or a 2G network. The current network may be different from the first network by a Radio Access Technology (RAT) of the current network and the first network. The first network and the second network respectively represent different networks, and the first network and the second network can respectively represent a 2G network and a 3G network, for example, the first network represents the 2G network, and the second network represents the 3G network; or the first network represents a 3G network and the second network represents a 2G network. The first network and the second network may be different in Radio Access Technology (RAT) from each other.

In an optional implementation manner, a terminal initiates a call or a called, and if a current network to which the terminal is attached does not have a CS domain, such as 4G, the terminal sends a first message to the current network, where the first message is used to request a CSFB voice service; after the current network receives the first message, an access network base station of the current network, such as an eNodeB, sends a second message to the terminal, where the second message indicates that the terminal is redirected from the current network to the first network, and the current network is different from the first network.

The terminal sends a connection request to a base station of a second network supporting a CS voice service so as to establish a CS connection, where the establishing of the CS connection may be that after the terminal establishes a connection with the base station of the second network, the terminal further sends a connection request to a core network of the second network, accesses the second network, establishes a CS connection, and continues the voice service.

In an optional implementation manner, the second message received by the terminal, such as an RRC Connection Release message or a Cell Change Order (CCO) message, includes information of the first network, and the information is used for redirection from the current network to the first network by the terminal. Specifically, the information includes a frequency point of a target cell of the first network, and the indication terminal may be redirected from the current network to the first network through the frequency point. The frequency point refers to a specific frequency value. Optionally, the information may further include system information of the target cell, where the system information may include a cell global ID (cellglobalid) of the target cell, where the cell global ID is a globally unique identifier of the target cell and may uniquely identify the cell ID of the target cell, and both the access network and the core network of the first network may identify the target cell through the cell global ID (cellglobalid). The information may further include a cell physical ID (pci) of the target cell, where the cell physical ID is a cell ID of a physical layer and is a cell identifier of physical layer channel signal interaction when the terminal is connected to a base station of the first network, and a scrambling form between cells is also related to the cell physical ID to avoid cell interference, but the cell physical ID is different from a cell global ID (cellglobaldid) and cannot uniquely identify the cell ID of the target cell, for example, a core network of the first network cannot uniquely identify the target cell by the cell physical ID.

In an alternative embodiment, the cell ID of the target cell may be a cell global ID or a cell physical ID.

The terminal obtaining the cell ID of the target cell of the first network according to the information includes:

and the terminal at least acquires system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the information, and acquires the cell global ID of the target cell of the first network from the system information. In other words, the terminal may obtain the system information corresponding to the frequency point according to the frequency point of the first network in the information; optionally, the terminal may further obtain system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the information and other information, for example, a cell physical ID;

or

In an optional implementation manner, the base station may send broadcast messages to corresponding cells at frequency points of each cell, where the broadcast messages at different frequency points may carry system information of a target cell corresponding to the frequency point, such as a cell global id (cellglobalid). After receiving the broadcast message corresponding to the frequency point of the first network, the terminal may obtain the cell ID of the corresponding target cell from the broadcast message. Therefore, the terminal may obtain the system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the information of the first network, and obtain the cell global ID of the target cell of the first network from the system information.

In an optional implementation manner, when the terminal determines that the preset condition is met according to the cell ID of the target cell of the first network, the terminal searches for a frequency point of an accessible second network, and sends a connection request to the second network according to the frequency point of the accessible second network, so as to establish the CS connection.

Specifically, the preset conditions may include:

A. the cell ID of the target cell belongs to a cell ID list stored in the terminal, where the cell ID list is used to store the cell ID of the first network when the terminal is switched from the first network to the second network, and the switching includes reselection, redirection, or handover.

B. The signals of the first network of the current network environment are better than the signals of the second network. The signal quality of the signal of the first network is higher than that of the signal of the second network, and specifically, the signal of the first network has higher stability or stronger signal strength. Optionally, the signal of the first network in the current network environment is better than the signal of the second network, where the signal strength of the first network corresponding to the cell ID of the target cell in the information of the first network included in the second message is less than a threshold M, the signal strength of the second network is greater than a threshold N, and N is greater than or equal to M.

C. The second network is pre-configured for preference. The preferentially selecting the second network refers to considering the second network first, and selecting other networks when the second network cannot meet the requirements. The unsatisfiable requirement may be that the network cannot meet a requirement for establishing a connection or some requirements set by the terminal, and the like, and the requirement is not limited by the present invention.

The preset condition may be at least one of the conditions A, B, C described above. When the preset conditions are two or more, the preset conditions satisfy the following meaning: all of the preset conditions are satisfied, or at least one of the preset conditions is satisfied.

And when the terminal is redirected, the judgment on the preset condition is added, and the terminal selects to access the second network when the preset condition is met, so that the redirection efficiency of the terminal can be further ensured, and the probability that the terminal is switched to the second network due to factors such as the signal difference of the first network after being directly redirected to the first network according to the second message is reduced.

Optionally, the thresholds M and N may be a certain value between-90 dBm and-60 dBm, and the thresholds M and N may be two same values or two different values.

Optionally, the method further includes updating the cell list, deleting the cell ID in the cell list that exceeds the validity period, and if the validity period is 8 hours, automatically deleting the cell ID record stored in the cell list for more than 8 hours. And the cell list is updated in real time, the effectiveness of the cell list is guaranteed, and the redirection efficiency of the terminal can be further improved.

In an optional embodiment, the determining, by the terminal, that the preset condition a is satisfied according to the cell ID includes: confirming that the cell ID is recorded in the cell list. Specifically, after the terminal acquires the cell ID of the target cell according to the information, the cell ID is searched in the cell list, and if the cell ID exists in the cell list, the preset condition a is satisfied. Optionally, the information may include multiple frequency points, and when at least one cell ID of the cell IDs corresponding to the multiple frequency points belongs to the cell list, the preset condition a is satisfied.

Optionally, the redirection record, that is, the cell list, redirected from the first network to the second network may further include a frequency point of the redirected second network corresponding to the target cell ID, and the sending, by the terminal, the connection request to the second network according to the accessible frequency point of the second network may specifically include: and the terminal searches the frequency point of the accessible second network redirected by the cell ID in the cell list and sends a connection request to the second network according to the frequency point of the second network.

In an optional embodiment, the determining, by the terminal, that the preset condition B is satisfied according to the cell ID includes: and confirming that the signal strength of the first network of the cell ID is smaller than a threshold value M, the signal strength of the second network is larger than a threshold value N, and N is larger than or equal to M. If the signal strength of the first network and the second network of the cell ID is not measured before the second message is received, the signal strength of the first network and the second network is measured. Optionally, the value range of the M, N is-90 dBm to-60 dBm. For example, if M is-90 dBm and N is-60 dBm, that is, if the signal strength of the first network is less than-90 dBm and the signal strength of the second network is greater than-60 dBm, the predetermined condition B is satisfied. If M, N are all-60 dBm, that is, if the signal strength of the first network is less than-60 dBm and the signal strength of the second network is greater than-60 dBm, the preset condition B is satisfied. Optionally, the information of the second network may include multiple frequency points, and first determine whether the signal strength of the first network of the cell ID corresponding to each frequency point is smaller than a threshold M as needed, and if the signal strengths of the first networks corresponding to the multiple cell IDs are smaller than the threshold M, measure the signal strength of the second network; if the signal strength of the first network corresponding to at least one cell ID in the plurality of cells is greater than the threshold M, the preset condition B is not satisfied.

In an optional embodiment, the determining, by the terminal, that the preset condition C is satisfied according to the cell ID includes: and when the terminal receives a second message, acquiring the cell ID of the target cell according to the information in the second message, wherein the preset condition C is met if the cell ID of the target cell belongs to the category of the target cell for which the terminal is pre-configured to preferentially select a second network. Optionally, the terminal pre-configuring the preference second network may include the terminal pre-configuring a cell ID voice service request preference second network of all or part of the target cell.

In an optional embodiment, whether a preset condition is met is judged according to the cell ID, and if the terminal judges that the preset condition is not met, a connection request is sent to the first network of the target cell according to a frequency point of a redirected first network in the information, and a call is established in the first network. For example, the information in the second message received by the terminal may include a redirected frequency point of a first network, a target cell ID is obtained according to the frequency point of the first network, if it is determined according to the cell ID that the preset condition is not met, it is determined whether the signal strength of the frequency point of the first network meets the minimum requirement for voice service fallback residence, and if it is met, a connection request is sent to the first network according to the frequency point of the first network; if not, other network signals of the cell or accessible network signals of nearby cells are searched. The method for sending a connection request to the first network of the target cell according to the frequency point of the first network in the information included in the second message and establishing a call in the first network is described by way of example only and is not limited in the present invention.

In an alternative embodiment, the information of the first network included in the second message may include a plurality of first network frequency points, such as 3 or 5 first network frequency points. When a plurality of first network frequency points exist, whether the preset condition is met or not is judged according to the cell ID of the target cell corresponding to each first network frequency point in sequence according to needs, and the judging method is the same as the above and is not repeated.

In the method for processing a call provided in this embodiment, after receiving the second message, the terminal obtains the cell ID of the target cell according to the information in the second message, and sends the connection request to the second network when determining that the preset condition is met according to the cell ID, so that the terminal can selectively access the second network according to the preset condition when being redirected, and the capability of the terminal in processing a call is enhanced.

The embodiment 2 of the invention provides a method for processing a call. The method for processing the call provided by the embodiment of the invention is simultaneously suitable for the calling terminal and the called terminal, and the selection of the redirection network of the calling terminal and the selection of the redirection network of the called terminal are mutually independent. Taking a 4G network terminal as an example, the terminal sends a first message, where the first message is used to Request a CSFB voice Service, such as an Extended Service Request message; a terminal receives a second message, such as RRC Connection Release, wherein the second message comprises information of a first network, and the information is used for redirecting the terminal from a current network to the first network supporting CS voice service, and the current network is different from the first network; acquiring a cell ID of a target cell of the first network indicating redirection in the information; and when the preset condition is judged to be met according to the cell ID, sending a connection request to a base station of a second network, such as a 2G base station, according to a frequency point of the second network which can be accessed so as to establish CS connection, wherein the first network is different from the second network. The step of establishing the CS connection may be that after the terminal establishes a connection with the second network base station, the terminal further sends a connection request to a core network of the second network, accesses the second network, establishes a CS connection, and continues a voice service. It should be understood that the first network and the second network respectively represent different networks, and the first network and the second network can represent a 2G network and a 3G network respectively, for example, the first network represents a 2G network and the second network represents a 3G network; or the first network represents a 3G network and the second network represents a 2G network. The first network and the second network provide the same service, which is to provide at least a part of the same service. For example, in an optional implementation manner of the present invention, the first network and the second network both provide at least a voice service in the CS domain, so as to implement redirection when the terminal performs the voice service.

Fig. 3 shows a signaling interaction diagram of a 4G network terminal initiating a call, which specifically includes:

201, the terminal sends a first message, such as an Extended Service Request message, to the MME through the eNodeB, where the first message is used to Request a CSFB voice Service. The Extended Service Request message belongs to a Non-Access Stratum (NAS) message.

202, MME sends S1-AP UE CONTEXT MODIFICATION REQUEST message to eNodeB based on S1-AP protocol. The message carries a CSFB indication, informing the eNodeB that the terminal initiates a CSFB service request.

203, after receiving the S1-AP UE CONTEXT MODULATION REQUEST message, the eNodeB sends an S1-AP UE CONTEXT MODULATION RESPONSE RESPONSE message to the MME.

204, which is an optional measurement report request, specifically including: the eNodeB requests the terminal to send a signal measurement report, and the terminal measures the signal intensity of each frequency point which can be accessed into a cell nearby and reports the signal intensity to the eNodeB; if the eNodeB is configured with the frequency point distribution and access strategy of the nearby cells, the terminal may not be required to measure and send a signal measurement report.

205, if the CSFB service can be performed normally, the eNodeB sends a second message, such as an RRCConnection Release message, to the terminal to instruct the terminal to redirect to the 2G/3G network, where the message carries a frequency point indicating the redirected first network. The frequency point of the redirected first network carried in this message may be one or more.

206, the eNodeB sends S1-AP: and the S1UE Context Release Request message requests to Release the UE Context connection established between the MME and the UE, namely, the S1 interface is released.

207, the eNodeB releases the UE context connection established with the MME, i.e. performs the operation of releasing the S1 interface.

The terminal processes the call 208. The terminal receives a second message, such as an RRC Connection Release message, where the second message includes information of a first network, and the information is used for the terminal to redirect from a current network to the first network supporting CS voice service, where the current network is different from the first network. And the terminal acquires the cell ID of the target cell of the first network according to the information and judges whether a preset condition is met or not according to the cell ID. And if so, searching a frequency point of the second network, for example, searching a frequency point accessible by 2G, and sending a connection request to the second network by the frequency point so as to establish the CS connection. For example, after acquiring the frequency point of the 3G network of the information, the terminal acquires system information corresponding to the frequency point, acquires a cell global ID of a target cell of the first network, that is, a cell ID of the target cell from the system information, searches whether the cell ID belongs to a cell ID list stored in the terminal, where the cell ID list is used to store the cell ID of the first network when the terminal is switched from the first network to the second network, and the switching includes reselection, redirection or switching. If the terminal belongs to the 2G accessible frequency point, the terminal searches the 2G accessible frequency point, and sends a connection request to the 2G network by using the 2G accessible frequency point to establish connection.

And the information of the first network in the second message comprises a frequency point of a target cell of the first network, and the indication terminal can be redirected to the first network from the current network through the frequency point. The frequency point refers to a specific frequency value. Optionally, the information may further include system information of the target cell, where the system information may include a cell global ID (cellglobalid) of the target cell, where the cell global ID is a globally unique identifier of the target cell and may uniquely identify the cell ID of the target cell, and both the access network and the core network of the first network may identify the target cell through the cell global ID (cellglobalid). The information may further include a cell physical ID (pci) of the target cell, where the cell physical ID is a cell ID of a physical layer and is a cell identifier of physical layer channel signal interaction when the terminal is connected to the first network base station, and a scrambling form between cells is also related to the cell physical ID to avoid cell interference, but the cell physical ID is different from a cell global ID (cellglobaldid) and cannot uniquely identify the cell ID of the target cell, for example, a core network of the first network cannot uniquely identify the target cell by the cell physical ID.

The terminal acquiring the cell ID of the target cell of the first network according to the information of the first network comprises the following steps:

the terminal at least acquires system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the information of the first network, and acquires the cell global ID of the target cell of the first network from the system information. In other words, the terminal may obtain the system information corresponding to the frequency point according to the frequency point of the first network in the information of the first network; optionally, the terminal may further obtain system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the information of the first network and other information, for example, a cell physical ID; or

The terminal obtains a cell global ID of a target cell of the first network from the target cell system information of the first network in the information of the first network; or

And the terminal obtains the cell physical ID of the target cell of the first network from the information of the first network.

In an optional implementation manner, the base station may send broadcast messages to corresponding cells at frequency points of each cell, where the broadcast messages at different frequency points may carry system information of a target cell corresponding to the frequency point, such as a cell global id (cellglobalid). After receiving the broadcast message corresponding to the frequency point of the first network, the terminal may obtain the cell ID of the corresponding target cell from the broadcast message. Therefore, the terminal may obtain the system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the second message, and obtain the cell global ID of the target cell of the first network from the system information.

In an optional implementation manner, when the terminal determines that the preset condition is met according to the cell ID of the target cell of the first network, the terminal searches for a frequency point of an accessible second network, sends a connection request to the second network according to the frequency point of the accessible second network, and establishes a call in the second network.

Specifically, the preset conditions may include:

A. the cell ID of the target cell belongs to a cell ID list stored in the terminal, and the cell ID list is used to store the cell ID of the first network when the terminal is switched from the first network to the second network, where the switching includes reselection, redirection or handover.

B. The current network environment is such that the first network signal is superior to the second network signal. The signal quality of the signal of the first network is higher than that of the signal of the second network, and specifically, the signal of the first network has higher stability or stronger signal strength. Optionally, the signal of the first network in the current network environment is better than the signal of the second network, where the measured signal strength of the first network corresponding to the cell ID of the target cell in the second message is less than a threshold M, the signal strength of the second network is greater than a threshold N, and N is greater than or equal to M.

C. The preference second network is pre-configured. The preferentially selecting the second network refers to considering the second network first, and selecting other networks when the second network cannot meet the requirements. The unsatisfiable requirement may be that the network cannot meet a requirement for establishing a connection or some requirements set by the terminal, and the like, and the requirement is not limited by the present invention.

The preset condition may be at least one of the conditions A, B, C described above. When the preset conditions are two or more, the preset conditions satisfy the following meaning: all of the preset conditions are satisfied, or at least one of the preset conditions is satisfied. And when the terminal is redirected, the judgment on the preset condition is added, and the terminal selects to access the second network when the preset condition is met, so that the redirection efficiency of the terminal can be further ensured, and the probability that the terminal is switched to the second network due to factors such as the signal difference of the first network after being directly redirected to the first network according to the second message is reduced.

Optionally, the terminal may further update the cell list, delete the target cell ID in the cell list that exceeds the validity period, and automatically delete the cell ID record stored in the cell list for more than 8 hours if the validity period is 8 hours. And the cell list is updated in real time, the effectiveness of the cell list is guaranteed, and the redirection efficiency of the terminal can be further improved.

In an optional embodiment, the determining, by the terminal, that the preset condition a is satisfied according to the cell ID includes: confirming that the cell ID is recorded in the cell list. Specifically, after the terminal acquires the cell ID of the target cell according to the second message, the cell ID is searched in the cell list, and if the cell ID exists in the cell list, the preset condition a is satisfied. Optionally, the second message may include multiple frequency points, and when at least one cell ID of the cell IDs corresponding to the multiple frequency points belongs to the cell list, the preset condition a is satisfied.

In an optional embodiment, the determining, by the terminal, that the preset condition B is satisfied according to the cell ID includes: and confirming that the signal strength of the first network of the cell ID is smaller than a threshold value M, the signal strength of the second network is larger than a threshold value N, and N is larger than or equal to M. If the signal strength of the first network and the second network of the cell ID is not measured before the second message is received, the signal strength of the first network and the second network is measured. Optionally, the value range of the M, N is-90 dBm to-60 dBm. For example, if M is-90 dBm and N is-60 dBm, that is, if the signal strength of the first network is less than-90 dBm and the signal strength of the second network is greater than-60 dBm, the predetermined condition B is satisfied. If M, N are all-60 dBm, that is, if the signal strength of the first network is less than-60 dBm and the signal strength of the second network is greater than-60 dBm, the preset condition B is satisfied. Optionally, the information of the first network in the second message may include multiple frequency points, and first determine whether the signal strength of the first network of the cell ID corresponding to each frequency point is smaller than a threshold M as needed, and if the signal strengths of the first networks corresponding to the multiple cell IDs are smaller than the threshold M, measure the signal strength of the second network; if the signal strength of the first network corresponding to at least one cell ID in the plurality of cells is not less than the threshold M, the preset condition B is not satisfied.

In an optional embodiment, the determining, by the terminal, that the preset condition C is satisfied according to the cell ID includes: and when the terminal receives a second message, acquiring the cell ID of the target cell according to the second message, wherein the preset condition C is met if the cell ID of the target cell belongs to the category of the target cell which is pre-configured by the terminal and preferentially selects a second network. Optionally, the terminal pre-configuring the preference second network may include the terminal pre-configuring a cell ID voice service request preference second network of all or part of the target cell.

In an optional embodiment, whether the preset condition is met is judged according to the cell ID, and if the terminal judges that the preset condition is not met, a connection request is sent to the first network of the target cell according to a frequency point for redirecting the first network in the second message, and a call is established in the first network. For example, the second message received by the terminal may include a redirected frequency point of a first network, a cell ID of a target cell is obtained according to the frequency point of the first network, if it is determined according to the cell ID that the preset condition is not met, it is determined whether the signal strength of the frequency point of the first network meets the minimum requirement for voice service fallback residence, and if it is met, a connection request is sent to the first network according to the frequency point of the first network; if not, other network signals of the cell or accessible network signals of nearby cells are searched. The method for sending the connection request to the first network of the target cell according to the frequency point of the first network in the second message and establishing the call in the first network is only illustrated by way of example and is not limited by the present invention.

In an optional embodiment, the second message may include a plurality of first network frequency points, such as 3 or 5 first network frequency points. When a plurality of first network frequency points exist, whether the preset condition is met or not can be judged according to the cell ID of the target cell corresponding to each first network frequency point in sequence according to needs, and the judgment method is the same as the above and is not repeated.

Optionally, 209, if the Location Area (LA) of the terminal changes, the terminal performs Location Area Update (LAU) in the second network, such as 2G.

210, the terminal sends a connection management Service Request (CM Service Request) message to the MSC through the BSS/RNS, initiating a call-controlled voice Service Request. The CM Service Request is a message in a third layer network protocol of the air interface protocol stack.

211-; after receiving the response of refusing the service request, the terminal initiates a position updating request. If the MSC is not changed, the MSC receives the service request message and sends an acceptance response message of the service request to the terminal.

213, the terminal establishes the CS voice service, which is the same as the existing CS voice service process and is not described in detail later.

In the method for processing a call provided in this embodiment, after receiving the second message, the terminal obtains the cell ID of the target cell according to the second message, and when the preset condition is determined to be satisfied according to the cell ID, sends the connection request to the second network, so that the terminal can selectively access the second network according to the preset condition when being redirected, thereby enhancing the call processing capability of the terminal.

Embodiment 3 of the present invention provides a terminal 300, a structure diagram of which is shown in fig. 4, for executing the methods in embodiment 1 and embodiment 2, and all the schemes and features that can be implemented in embodiment 1 and embodiment 2 are applicable to this embodiment, and are not described herein again.

This terminal 300 includes:

a sending module 302, configured to send a first message, where the first message is used to request a CSFB voice service;

a receiving module 304, configured to receive a second message, where the second message includes information of a first network, and the information is used for the terminal to redirect from a current network to the first network supporting CS voice service, where the current network is different from the first network;

an obtaining module 306, configured to obtain a cell ID of a target cell of the first network according to the information;

a processing module 308, configured to determine whether a preset condition is met according to the cell ID, and if so, send a connection request to a base station of a second network supporting CS voice service to establish a CS connection, where the first network is different from the second network.

It should be understood that the first network and the second network respectively represent different networks, and the first network and the second network can represent a 2G network and a 3G network respectively, for example, the first network represents a 2G network and the second network represents a 3G network; or the first network represents a 3G network and the second network represents a 2G network.

The first network and the second network provide the same service, which is to provide at least a part of the same service. For example, in an optional implementation manner of the present invention, the first network and the second network both provide at least a voice service in the CS domain, so as to implement redirection when the terminal performs the voice service.

In an optional embodiment, the second message received by the receiving module, such as an RRC connection release message or a CCO (cell change order) message, includes information of the first network, and the information is used to instruct the terminal 300 to redirect from the current network to the first network. Specifically, the information includes a frequency point of a target cell of the first network, and the indication terminal 300 may be redirected from the current network to the first network through the frequency point. The frequency point refers to a specific frequency value. Optionally, the information may further include system information of the target cell, where the system information may include a cell global ID (cellglobalid) of the target cell, where the cell global ID is a globally unique identifier of the target cell and may uniquely identify the cell ID of the target cell, and both the access network and the core network of the first network may identify the target cell through the cell global ID (cellglobalid). The information may further include a cell physical ID (pci) of the target cell, where the cell physical ID is a cell ID of a physical layer and is a cell identifier of physical layer channel signal interaction when the terminal is connected to a base station of the first network, and a scrambling form between cells is also related to the cell physical ID to avoid cell interference, but the cell physical ID is different from a cell global ID (cellglobaldid) and cannot uniquely identify the cell ID of the target cell, for example, a core network of the first network cannot uniquely identify the target cell by the cell physical ID.

The obtaining, by the obtaining module, the cell ID of the target cell of the first network according to the information includes:

and acquiring system information corresponding to the frequency point at least according to the frequency point of the target cell of the first network in the information, and acquiring the cell global ID of the target cell of the first network from the system information. In other words, the terminal may obtain the system information corresponding to the frequency point according to the frequency point of the first network in the information; optionally, the terminal may further obtain system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the information and other information, for example, a cell physical ID; or

In an optional implementation manner, the base station may send broadcast messages to corresponding cells at frequency points of each cell, where the broadcast messages at different frequency points may carry system information of a target cell corresponding to the frequency point, such as a cell global id (cellglobalid). After receiving the broadcast message corresponding to the frequency point of the first network, the receiving module may obtain the cell ID of the corresponding target cell from the broadcast message. Therefore, the obtaining module may obtain the system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the second message, and obtain the cell global ID of the target cell of the first network from the system information.

In an optional implementation manner, when the processing module determines that the preset condition is met according to the cell ID of the target cell of the first network, the processing module searches for a frequency point of an accessible second network, sends a connection request to the second network according to the frequency point of the accessible second network, and establishes a call in the second network.

Specifically, the preset conditions may include:

B. The signal of the second network of the current network environment is better than the signal of the first network. The signal quality of the signal of the first network is higher than that of the signal of the second network, and specifically, the signal of the first network has higher stability or stronger signal strength. Optionally, the signal of the first network in the current network environment is better than the signal of the second network, where the measured signal strength of the first network corresponding to the cell ID of the target cell in the second message is less than a threshold M, the signal strength of the second network is greater than a threshold N, and N is greater than or equal to M.

In an optional embodiment, the terminal 300 further includes a storage module, which stores the cell list. Optionally, the storage module may further update the cell list, delete the target cell ID in the cell list that exceeds the validity period, and automatically delete the cell ID record stored in the cell list for more than 8 hours if the validity period is 8 hours. And the cell list is updated in real time, the effectiveness of the cell list is guaranteed, and the redirection efficiency of the terminal can be further improved.

In an optional embodiment, the determining, by the processing module, that the preset condition a is satisfied according to the cell ID of the target cell includes: confirming that the cell ID is recorded in a cell list of a storage module. Specifically, after the obtaining module obtains the cell ID of the target cell according to the information, the processing module searches the cell list for the cell ID, and if the cell ID exists in the cell list, the preset condition a is satisfied. Optionally, the information may include multiple frequency points, and when at least one cell ID of the cell IDs corresponding to the multiple frequency points belongs to the cell list, the preset condition a is satisfied.

Optionally, the redirection record, that is, the cell list, redirected from the first network to the second network may further include a frequency point of the redirected second network corresponding to the target cell ID, and the processing module sends the connection request to the second network according to the accessible frequency point of the second network, which specifically includes: and the processing module searches the frequency point of the accessible second network redirected by the cell ID in the cell list and sends a connection request to the second network according to the frequency point of the second network.

In an optional embodiment, the determining, by the processing module, that the preset condition B is met according to the cell ID includes: and confirming that the signal strength of the first network of the cell ID is smaller than a threshold value M, the signal strength of the second network is larger than a threshold value N, and N is larger than or equal to M. Optionally, the terminal further includes a measurement module, and if the signal strengths of the first network and the second network of the cell ID are not measured before the receiving module receives the second message, the measurement module measures the signal strengths of the first network and the second network. Optionally, the value range of the M, N is-90 dBm to-60 dBm. For example, if M is-90 dBm and N is-60 dBm, that is, if the signal strength of the first network is less than-90 dBm and the signal strength of the second network is greater than-60 dBm, the predetermined condition B is satisfied. If M, N are all-60 dBm, that is, if the signal strength of the first network is less than-60 dBm and the signal strength of the second network is greater than-60 dBm, the preset condition B is satisfied. Optionally, the information may include multiple frequency points, and it is first determined whether the signal strength of the first network of the cell ID corresponding to each frequency point is smaller than a threshold M as needed, and if the signal strengths of the first networks corresponding to the multiple cell IDs are smaller than the threshold M, the signal strength of the second network is measured; if the signal strength of the first network corresponding to at least one cell ID in the plurality of cells is greater than the threshold M, the preset condition B is not satisfied.

In an optional embodiment, the determining, by the processing module, that the preset condition C is satisfied according to the cell ID includes: and acquiring the cell ID of the target cell, wherein the preset condition C is met if the cell ID of the target cell belongs to the category of the target cell of which the terminal is pre-configured with a priority selection second network. Optionally, the terminal pre-configuring the preference second network may include the terminal pre-configuring a cell ID voice service request preference second network of all or part of the target cell.

In an optional embodiment, if the sending module determines that the preset condition is not met according to the cell ID of the target cell, the sending module sends a connection request to the first network of the target cell according to the frequency point of the redirected first network in the information, and establishes a call in the first network. For example, the second message received by the receiving module includes a redirected frequency point of a first network, the cell ID of the target cell is obtained according to the frequency point of the first network, if the preset condition is judged not to be met according to the cell ID, the processing module judges whether the signal intensity of the frequency point of the first network meets the minimum requirement of voice service fallback residence, and if the signal intensity meets the minimum requirement, the processing module sends a connection request to the first network according to the frequency point of the first network; if not, other network signals of the cell or accessible network signals of nearby cells are searched. The method for sending the connection request to the first network of the target cell according to the frequency point of the first network in the second message and establishing the call in the first network is only illustrated by way of example and is not limited by the present invention.

In an optional embodiment, the information may include a plurality of first network frequency points, such as 3 or 5 first network frequency points. When a plurality of first network frequency points exist, whether the preset condition is met or not is judged according to the cell ID of the target cell corresponding to each first network frequency point in sequence according to needs, and the judging method is the same as the above and is not repeated.

In the terminal provided in this embodiment, after receiving the second message, the terminal obtains the cell ID of the target cell according to the information, and sends the connection request to the second network when determining that the preset condition is met according to the cell ID, so that the terminal can selectively access the second network according to the preset condition when being redirected, thereby enhancing the call processing capability of the terminal.

It should be noted that, the modules of the terminal may be implemented by one or more hardware or software modules of an actual product, and the specific implementation of the modules does not limit the present invention. Taking fig. 6 as an example, fig. 6 shows a specific embodiment of the processor, and the receiving module 301 and the obtaining module 302 of the terminal may be implemented by an access stratum. Specifically, if the receiving module receives the second message and the obtaining module obtains the cell ID of the target cell of the first network according to the information of the first network included in the second message, both the receiving module and the obtaining module can be implemented by the access stratum in the processor of fig. 6. The access stratum may enable connection and interaction of the terminal 300 with an access network base station. The processing module 306 may be implemented by a non-access stratum, specifically, if the processing module determines whether a preset condition is met according to the cell ID, and if the preset condition is met, the processing module instructs the access stratum to send a connection request to the base station of the second network; it can also be understood that the processing module 306 can be implemented by a non-access stratum and an access stratum, specifically, if the non-access stratum determines whether a preset condition is met according to the cell ID, if so, the access stratum sends a connection request to the base station of the second network. It should be understood that: each unit or sub-unit (e.g., the above-mentioned non-access stratum, etc.) in fig. 6 is a module/program having a corresponding function.

It should be understood that the terminal 300 provided according to the embodiment of the present invention may correspond to the terminal in the foregoing communication method, and the operations and/or functions of the respective modules in the terminal 300 implement the corresponding flows of the respective methods in fig. 1 to fig. 2, respectively, and for brevity, are not described again here.

Further, a computer-readable medium is provided comprising computer-readable instructions that when executed perform the following: the operations 102 to 106 of the method in the above embodiment are performed. Optionally, operations of optional steps in the method in the above embodiments may also be performed.

Additionally, a computer program product is also provided, comprising the computer readable medium described above.

Fig. 5 is a schematic diagram of a hardware structure of a terminal according to embodiment 4 of the present invention.

The terminal 400 includes a processor 402, memory 404, transceiver 406, and bus 408. Wherein the processor 402, memory 404, and transceiver 406 communicate over a bus 408.

The transceiver 406 is configured to send a first message, where the first message is used to request a CSFB voice service;

the transceiver 406 is further configured to receive a second message, the second message including information of a first network, the information being used for redirection of the terminal from a current network to the first network supporting CS voice service, the current network being different from the first network;

the processor 402 is configured to obtain a cell ID of a target cell of the first network according to the information; and judging whether the preset condition is met or not according to the cell ID, and if so, controlling the transceiver 406 to send a connection request to a base station of a second network supporting CS voice service so as to establish CS connection, wherein the first network is different from the second network.

The processor 402 obtaining the cell ID of the target cell of the first network from the information comprises:

and acquiring system information corresponding to the frequency point at least according to the frequency point of the target cell of the first network in the information, and acquiring the cell global ID of the target cell of the first network from the system information. In other words, the terminal may obtain the system information corresponding to the frequency point according to the frequency point of the first network in the second message; optionally, the terminal may further obtain system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the second message and other information, for example, a cell physical ID; or

In an optional implementation manner, the base station may send broadcast messages to corresponding cells at frequency points of each cell, where the broadcast messages at different frequency points may carry system information of a target cell corresponding to the frequency point, such as a cell global id (cellglobalid). After the terminal receives the broadcast message corresponding to the frequency point of the first network, the processor 402 may obtain the cell ID of the corresponding target cell from the broadcast message. Therefore, the processor 402 may obtain the system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the second message, and obtain the cell global ID of the target cell of the first network from the system information.

In an optional implementation manner, the processor 402 determines whether a preset condition is met according to a cell ID of a target cell of the first network, and if the preset condition is met, searches for a frequency point of an accessible second network, sends a connection request to the second network according to the frequency point of the accessible second network, and establishes a call in the second network.

Specifically, the preset conditions may include:

B. The signals of the first network of the current network environment are better than the signals of the second network. The signal quality of the signal of the first network is higher than that of the signal of the second network, and specifically, the signal of the first network has higher stability or stronger signal strength. Optionally, the signal of the first network in the current network environment is better than the signal of the second network, where the measured signal strength of the first network corresponding to the cell ID obtained according to the information of the first network in the second message is less than a threshold M, the signal strength of the second network is greater than a threshold N, and N is greater than or equal to M.

Optionally, the processor 402 further updates the cell list, deletes the target cell ID exceeding the validity period in the cell list, and automatically deletes the cell ID record stored in the cell list for more than 8 hours if the validity period is 8 hours. And the cell list is updated in real time, the effectiveness of the cell list is guaranteed, and the redirection efficiency of the terminal can be further improved.

In an optional embodiment, the processor 402, according to the cell ID of the target cell, determining that the preset condition a is satisfied includes: confirming that the cell ID is recorded in the cell list. Specifically, after the processor 402 acquires the cell ID of the target cell according to the information of the first network in the second message, the cell ID is searched in the cell list, and if the cell ID exists in the cell list, the preset condition a is satisfied. Optionally, the second message may include multiple frequency points, and when at least one cell ID of the cell IDs corresponding to the multiple frequency points belongs to the cell list, the preset condition a is satisfied.

Optionally, the redirection record, that is, the cell list, redirected from the first network to the second network may further include a frequency point of the redirected second network corresponding to the target cell ID, and the sending, by the processor 402, the connection request to the second network according to the accessible frequency point of the second network may specifically include: the processor 402 searches the frequency point of the accessible second network redirected by the target cell ID in the cell list, and sends a connection request to the second network according to the frequency point of the second network.

In an optional embodiment, the processor 402, according to the cell ID of the target cell, determining that the preset condition B is satisfied includes: and confirming that the signal strength of the first network of the cell ID is smaller than a threshold value M, the signal strength of the second network is larger than a threshold value N, and N is larger than or equal to M. If the signal strength of the first network and the second network of the cell ID is not measured before the second message is received, the signal strength of the first network and the second network is measured. Optionally, the value range of the M, N is-90 dBm to-60 dBm. For example, if M is-90 dBm and N is-60 dBm, that is, if the signal strength of the first network is less than-90 dBm and the signal strength of the second network is greater than-60 dBm, the predetermined condition B is satisfied. If M, N are all-60 dBm, that is, if the signal strength of the first network is less than-60 dBm and the signal strength of the second network is greater than-60 dBm, the preset condition B is satisfied. Optionally, the second message may include multiple frequency points, and first determine whether the signal strength of the first network of the cell ID corresponding to each frequency point is smaller than a threshold M according to needs, and if the signal strengths of the first networks corresponding to the multiple cell IDs are smaller than the threshold M, measure the signal strength of the second network; if the signal strength of the first network corresponding to at least one cell ID in the plurality of cells is greater than the threshold M, the preset condition B is not satisfied.

In an optional embodiment, the processor 402, according to the cell ID of the target cell, determining that the preset condition C is satisfied includes: and confirming that the cell ID of the target cell belongs to the category of the target cell of which the terminal is pre-configured with the second network with priority, wherein the preset condition C is met. Optionally, the terminal pre-configuring the preference second network may include the terminal pre-configuring a cell ID voice service request preference second network of all or part of the target cell.

In an optional embodiment, whether the preset condition is met is determined according to the cell ID, and if the processor 402 determines that the preset condition is not met according to the cell ID, the connection request is sent to the first network of the target cell according to the frequency point of the redirected first network in the second message, and a call is established in the first network. For example, the received second message may include a redirected frequency point of a first network, the processor 402 obtains a cell ID according to the frequency point of the first network, if it is determined according to the cell ID that the preset condition is not met, it is determined whether the signal strength of the frequency point of the first network meets the minimum requirement for a voice service fallback residence, and if it is met, a connection request is sent to the first network according to the frequency point of the first network; if not, other network signals of the cell or accessible network signals of nearby cells are searched. The method for sending the connection request to the first network of the target cell according to the frequency point of the first network in the second message and establishing the call in the first network is only illustrated by way of example and is not limited by the present invention.

In an optional embodiment, the second message may include a plurality of first network frequency points, such as 3 or 5 first network frequency points. When a plurality of first network frequency points exist, whether the preset condition is met or not is judged according to the cell ID of the target cell corresponding to each first network frequency point in sequence according to needs, and the judging method is the same as the above and is not repeated.

It should be understood that, according to the terminal 400 provided in the embodiment of the present invention, corresponding processes of the methods in fig. 1 to fig. 2 can be implemented, and for brevity, detailed description is not repeated herein, and the related descriptions in the foregoing method embodiments also apply to this embodiment.

The terminal provided in this embodiment, after receiving the second message, obtains the cell ID of the target cell according to the second message, and sends the connection request to the second network when determining that the preset condition is met according to the cell ID, so that the terminal can selectively access the second network according to the preset condition when being redirected, thereby enhancing the call processing capability of the terminal.

A schematic block diagram of modules/programs inside the processor 402 is seen in fig. 6.

It should be understood that, in the embodiment of the present invention, the processor 402 may be a Central Processing Unit (CPU), and the processor 402 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or any conventional processor or the like. For example, the processor 402 may be MSM8974, or MSM8974Pro, or MSM 8926.

The bus 408 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. But for clarity of illustration the various buses are labeled as bus 408 in the figure.

It should be understood that the transceiver 406 may also remain connected to one or more antennas.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 402. The steps of a method disclosed in connection with the embodiments of the present invention may be embodied directly in the processor 402, or in a combination of hardware and software modules within the processor 402. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium may be internal to the processor 402 or external to the processor 402, and may be combined with hardware to implement the steps of the method. To avoid repetition, it is not described in detail here.

It should be noted that although the terminal 400 shown in fig. 5 shows only the processor 402, the memory 404, the transceiver 406, and the bus 408, in particular implementations, those skilled in the art will appreciate that the terminal 400 also contains other components necessary to achieve proper operation. Also, it will be apparent to those skilled in the art that the terminal 400 may also include hardware components to implement other additional functions, according to particular needs. Further, those skilled in the art will appreciate that terminal 400 may also contain only those components necessary to implement embodiments of the present invention, and need not contain all of the components shown in FIG. 5.

The hardware configuration shown in fig. 5 and the above description are applicable to various terminals provided by the embodiments of the present invention. It will be apparent to those skilled in the art that all or part of the steps of the above method may be performed by hardware associated with program instructions, and the program may be stored in a computer readable storage medium such as ROM, RAM, optical disk, etc.

Embodiment 5 of the present invention further provides a processor 402, and it should be understood that, in this embodiment of the present invention, the processor 402 may be a Central Processing Unit (CPU), and the processor 402 may also be other general processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or any conventional processor or the like. For example, the processor 402 may be MSM8974, or MSM8974Pro, or MSM 8926.

In particular, the processor 402 may be configured to perform the following operations:

It should be understood that: the embodiment is described from the perspective of the processor 402, and during the processing of the processor 402, information may be transmitted via the transceiver 406, the bus 408, and necessary auxiliary circuits (e.g., antennas), including but not limited to: data, messages, values, parameters, instructions or signaling. For example, the second message received by the processor 402 may be forwarded after being received by the transceiver 406; the processor 402 sends a connection request, may send to a base station of the second network via the transceiver 406, etc. It should be understood that the current network and the first network each represent different networks, such as the current network representing a 4G network and the first network representing a 3G network or a 2G network. The current network may be different from the first network by a Radio Access Technology (RAT) of the current network and the first network. The first network and the second network respectively represent different networks, and the first network and the second network can respectively represent a 2G network and a 3G network, for example, the first network represents the 2G network, and the second network represents the 3G network; or the first network represents a 3G network and the second network represents a 2G network. The first network and the second network may be different in Radio Access Technology (RAT) from each other.

and acquiring system information corresponding to the frequency point at least according to the frequency point of the target cell of the first network in the information, and acquiring the cell global ID of the target cell of the first network from the system information. In other words, the terminal may obtain the system information corresponding to the frequency point according to the frequency point of the first network in the second message; optionally, the terminal may further obtain system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the second message and other information, for example, a cell physical ID;

or

In an optional implementation manner, the base station may send broadcast messages to corresponding cells at frequency points of each cell, where the broadcast messages at different frequency points may carry system information of a target cell corresponding to the frequency point, such as a cell global id (cellglobalid). After receiving the broadcast message corresponding to the frequency point of the first network, the processor 402 may obtain the cell ID of the corresponding target cell from the broadcast message. Therefore, the processor 402 may obtain the system information corresponding to the frequency point according to the frequency point of the target cell of the first network in the information, and obtain the cell global ID of the target cell of the first network from the system information.

In an optional implementation manner, when the processor 402 determines that the preset condition is met according to the cell ID of the target cell of the first network, it searches for a frequency point of an accessible second network, sends a connection request to the second network according to the frequency point of the accessible second network, and establishes a call in the second network.

Specifically, the preset conditions may include:

A. the cell ID of the target cell belongs to a stored cell ID list, which is used to store the cell ID of the first network when switching from the first network to the second network, where the switching includes reselection, redirection or handover.

B. The signals of the first network of the current network environment are better than the signals of the second network. The signal quality of the signal of the first network is higher than that of the signal of the second network, and specifically, the signal of the first network has higher stability or stronger signal strength. Optionally, the signal of the first network in the current network environment is better than the signal of the second network, where the measured signal strength of the first network corresponding to the cell ID acquired according to the information of the first network in the second message is less than a threshold M, the signal strength of the second network is greater than a threshold N, and N is greater than or equal to M.

It should be understood that the processor 402 provided according to the embodiment of the present invention may correspond to a terminal in the above communication method, and the processor 402 implements corresponding processes of the methods in fig. 1 to fig. 2, which are not described herein again for brevity.

Fig. 6 is an example of a processor provided in an embodiment of the present invention, where the modules are modules/programs with corresponding functions, and mainly include: access stratum, non-access stratum, multi-mode, modular interface, etc. Wherein, the access layer is a module/program for connecting and interacting with a base station of the network, such as receiving a second message; acquiring a cell ID of a target cell of the first network indicating redirection in the second message; a connection request, etc. is sent to the base station of the second network. The non-access layer can realize the processing and interaction functions above the access layer functions, such as the judgment of preset conditions; the processing flow between the processor and the core network, etc. Other modules of the processor, such as a multi-mode module, a module interface, a data service, a broadcast service, an Internet Protocol (IP) multimedia subsystem, and the like, can provide support for the processor accessing a network or a service after the processor accessing the network, for example, the multi-mode module is a management for communication in multiple working modes, and mainly includes multi-mode management, connection management, and system decision; the module interface provides information interface for processor to process various services, mainly including: quality of service, data management, wireless message management, packet data services, address book services, etc.

The processor provided in this embodiment, after receiving the second message, obtains the cell ID of the target cell according to the second message, and sends the connection request to the second network when determining that the preset condition is met according to the cell ID, so that the terminal can be selectively accessed to the second network according to the preset condition when being redirected, thereby enhancing the capability of the processor in processing a call.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

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

Claims

1. A method of processing voice traffic, the method comprising:

a terminal sends a first message, wherein the first message is used for requesting a circuit switched fallback CSFB voice service;

the terminal receiving a second message, the second message including information of a first network, the information being used for the terminal to redirect from a current network to the first network supporting Circuit Switched (CS) voice service, the current network being different from the first network;

the terminal judges whether a preset condition is met according to the cell ID, if so, the terminal sends a connection request to a base station of a second network supporting CS voice service so as to establish CS connection, wherein the first network is different from the second network, and the preset condition is as follows: the cell ID belongs to a cell list stored in the terminal, where the cell list is used to store the cell ID of the first network when the terminal is switched from the first network to the second network, and the switching includes reselection, redirection, or handover.

2. The method of claim 1, further comprising: and updating the cell list, and deleting the cell ID of the target cell exceeding the validity period in the cell list.

3. The method according to claim 1 or 2, wherein the cell ID is a cell global ID or a cell physical ID, and the terminal obtains the cell ID of the target cell of the first network according to the information, comprising:

4. The method of claim 1, wherein sending a connection request to a base station of the second network comprises:

5. A terminal, characterized in that the terminal comprises:

a sending module, configured to send a first message, where the first message is used to request a circuit switched fallback CSFB voice service;

a receiving module, configured to receive a second message, where the second message includes information of a first network, and the information is used for the terminal to redirect from a current network to the first network supporting a circuit switched CS voice service, where the current network is different from the first network;

a processing module, configured to determine whether a preset condition is met according to the cell ID, and if so, send a connection request to a base station of a second network supporting a CS voice service to establish a CS connection, where the first network is different from the second network, and the terminal further includes a storage module, where the preset condition is: the cell ID belongs to a cell list stored in the storage module, where the cell list is used to store the cell ID of the first network when the terminal is switched from the first network to the second network, and the switching includes reselection, redirection or handover.

6. The terminal of claim 5, wherein the storage module updates the cell list and deletes the cell ID of the target cell in the cell list that exceeds the validity period.

7. The terminal according to claim 5 or 6, wherein the cell ID is a cell global ID or a cell physical ID, and the obtaining module is specifically configured to:

8. The terminal of claim 5, wherein the processing module is specifically configured to:

9. A processor, wherein the processor is configured to perform the following operations:

sending a first message, wherein the first message is used for requesting a circuit switched fallback CSFB voice service;

receiving a second message, the second message including information of a first network, the information being used for the terminal to redirect from a current network to the first network supporting a circuit switched, CS, voice service, the current network being different from the first network;

judging whether a preset condition is met according to the cell ID, if so, sending a connection request to a base station of a second network supporting CS voice service so as to establish CS connection, wherein the first network is different from the second network, and the preset condition is as follows: the cell ID belongs to a saved cell list for saving the cell ID of the first network when transitioning from the first network to the second network, the transitioning including reselection, redirection or handover.

10. The processor of claim 9, wherein the processor is further configured to update the cell list, and delete the cell ID of the target cell in the cell list that exceeds the validity period.

11. The processor according to claim 9 or 10, wherein the cell ID is a cell global ID or a cell physical ID, and the obtaining the cell ID of the target cell of the first network according to the second message comprises:

12. The processor of claim 9, wherein sending a connection request to the second network comprises:

13. A terminal, comprising: a processor, transceiver, memory and bus as claimed in any of claims 9 to 12, the processor, transceiver and memory communicating over the bus as claimed in any of claims 9 to 12;

the memory is to store instructions;

the transceiver is configured to receive a second message and send the second message to the processor, where the second message includes information of a first network, and the information is used for the terminal to redirect from a current network to the first network supporting Circuit Switched (CS) voice service, where the current network is different from the first network;