WO2017190305A1

WO2017190305A1 - Cell switching method, terminal, and core network device

Info

Publication number: WO2017190305A1
Application number: PCT/CN2016/081101
Authority: WO
Inventors: 陈宏�; 尧俊峰
Original assignee: 海能达通信股份有限公司
Priority date: 2016-05-05
Filing date: 2016-05-05
Publication date: 2017-11-09

Abstract

Provided in an embodiment of the invention are a cell switching method, a terminal, and a core network device. The cell switching method comprises: a terminal participating in a current call in a broadband service cell, the terminal having registered at the broadband service cell and a narrowband service cell; the terminal acquiring information of a service channel in a narrowband target cell to use the same for the current call; and the terminal switching, according to the acquired information of the service channel, from the broadband service cell to the narrowband target cell and continuing the current call. The embodiment of the invention realizes switching from a broadband cell to a narrowband cell, thereby avoiding call drop.

Description

Cell switching method, terminal and core network device

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a cell handover method, a terminal, and a core network device.

Background technique

In the field of professional trunking communication, the Police Digital Trunking (PDT) system, the Terrestrial Trunked Radio (Tetra) system and the P25 (Project25) are several mainstream systems, all of which belong to the narrowband cluster system. Narrowband trunking communication systems such as PDT, Tetra, and P25 can provide users with good narrowband voice services, but have the disadvantage of low transmission rate in data services, and cannot meet the needs of growing broadband services such as images and data. The problem is that the industry is generally optimistic about narrow-band systems and broadband systems for broadband and narrow-band cluster convergence. Broadband systems such as Long Term Evolution (LTE) systems, wideband and narrowband cluster convergence methods such as PDT+LTE, Tetra+LTE, P25+LTE, etc. .

In the initial stage of convergence, the core networks are respectively constructed and interconnected through gateways. The network architecture of the gateway interconnection can be as shown in Figure 1. After that, the core network will gradually transition to the unified integration phase. The unified network architecture can be as shown in Figure 2. Terminal types supported by wideband and narrowband cluster systems include narrowband terminals, broadband terminals, and dual mode terminals.

The existing broadband cluster and narrowband cluster standards support the switching function: for the broadband cluster terminal, the switching scheme defined by the broadband standard (for example, LTE handover) can be adopted; for the narrowband cluster terminal, the handover scheme defined by the narrowband cluster standard can be adopted (for example, : PDT handover); for dual-mode terminals, from the broadband cell to the broadband cell handover, a broadband handover scheme can be adopted, and a narrowband handover scheme can be adopted from a narrowband cell to a narrowband cell, and a narrowband handover scheme can be adopted, and the handover from the broadband cell to the narrowband cell is now There are standards and technical specifications not covered.

Summary of the invention

In view of this, the embodiment of the present invention provides a cell handover method, where a terminal and a core network device can implement handover from a broadband cell to a narrowband cell to avoid dropped calls.

In a first aspect, a cell handover method provided by an embodiment of the present invention includes:

The terminal participates in the current call in the broadband serving cell, and the terminal is in the broadband serving cell and narrowband service The community is registered;

The terminal acquires information of a traffic channel of a current call in the narrowband target cell;

The terminal switches from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel.

In a possible implementation, the acquiring, by the terminal, the information of the traffic channel of the current call in the narrowband target cell includes: the terminal requesting the core network device to allocate a traffic channel in the narrowband target cell for the current call; the terminal acquiring the traffic channel Information.

In another possible implementation, after the terminal requests the core network device to allocate the traffic channel to the narrowband target cell, the terminal, after the terminal participates in the current call in the broadband serving cell, the method further includes: the terminal receiving the narrowband serving cell Broadcast information sent by the home narrowband core network, the broadcast information includes information of a traffic channel of the narrowband target cell; the terminal acquires a traffic channel list according to the broadcast information; the terminal determines whether the current call service exists in the traffic channel list The information of the channel; if the information of the traffic channel of the current call does not exist in the traffic channel list, the terminal is triggered to request the core network to allocate a traffic channel to the narrowband target cell for the current call.

In another possible implementation manner, the terminal requesting the core network device to allocate a traffic channel to the narrowband target cell for the current call includes:

The terminal sends a cell handover request to the broadband core network through the broadband cluster base station, where the cell handover request includes the call identifier of the current call and the radio location identification number LAI of the narrowband target cell, so that the broadband core network is based on the narrowband target cell. The LAI identifies the narrowband core network to which the narrowband target cell belongs, and acquires information of the traffic channel of the current call in the narrowband target cell;

The information obtained by the terminal for acquiring the traffic channel includes:

The terminal acquires information of a traffic channel of the current call from the broadband core network by using the broadband cluster base station; and/or,

The terminal acquires information of the traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband serving cell, and the information of the traffic channel of the current call is sent by the broadband core network to the narrowband cluster base station.

The terminal determines whether the current call is a group call and the group belongs to the broadband core network;

If the current call is a group call and the group belongs to the broadband core network, the terminal sends a call setup request to the narrowband core network to which the narrowband target cell belongs by using the narrowband cluster base station corresponding to the narrowband target cell, where the call setup request includes the group call The group identifier is such that the narrowband core network to which the narrowband target cell belongs sends the call setup request to the group of home broadband core networks, and acquires information of the traffic channel of the current call in the narrowband target cell;

The terminal acquires information about the traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband target cell.

The terminal determines whether the current call is a group call and the group belongs to the narrowband core network;

If the current call is a group call and the group belongs to the narrowband core network, the terminal sends a call setup request to the narrowband core network to which the narrowband target cell belongs by using the narrowband cluster base station corresponding to the narrowband target cell, where the call setup request includes the group And the group identity of the call, so that the narrowband core network to which the narrowband target cell belongs sends the call setup request to the group of the home narrowband core network, and acquires information about the service channel of the current call in the narrowband target cell;

The terminal sends a cell handover request to the unified converged core network by using the broadband cluster base station, where the cell handover request includes the call identifier of the current call and the radio location identification number LAI of the narrowband target cell, so that the unified converged core network according to the narrowband The LAI of the target cell and the call identifier are that the current call allocates a traffic channel in the narrowband target cell;

The terminal acquires information of the traffic channel from the broadband cluster base station, and the information of the traffic channel is sent by the unified converged core network to the broadband cluster base station;

and / or,

The terminal acquires information of the traffic channel from the narrowband cluster base station corresponding to the narrowband serving cell, and the information of the traffic channel is sent by the unified converged core network to the narrowband cluster base station.

The terminal determines whether the current call is a group call;

If the current call is a group call, the terminal sends a call setup request to the unified convergence core network by using the narrowband cluster base station corresponding to the narrowband target cell, where the call setup request includes the group identifier of the group call, so that the unified fusion core And the network allocates a traffic channel in the narrowband target cell for the current call by combining the terminal into the group call according to the group identifier;

The terminal acquires information about the traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband target cell, and the traffic channel information is sent by the unified converged core network to the narrowband cluster base station.

In another possible implementation, the information about the service channel of the current call in the narrowband target cell is obtained by the terminal, including:

The terminal receives broadcast information sent by the narrowband core network to which the narrowband serving cell belongs, and the broadcast information includes information of a traffic channel of the narrowband target cell;

The terminal acquires a traffic channel list according to the broadcast information;

Determining, by the terminal, whether information about a traffic channel of the current call exists in the traffic channel list;

If the information of the traffic channel of the current call exists in the traffic channel list, the terminal acquires information about the traffic channel of the current call in the narrowband target cell from the narrowband cluster base station corresponding to the narrowband serving cell.

In a second aspect, a terminal provided by the embodiment of the present invention includes:

a calling module, configured to participate in a current call in a broadband serving cell, where the terminal is registered in the broadband serving cell and the narrowband serving cell;

An acquiring module, configured to acquire information about a service channel of a current call in a narrowband target cell;

And a processing module, configured to switch from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel acquired by the acquiring module.

In a possible implementation manner, the obtaining module includes:

a requesting unit, configured to request the core network device to allocate a service to the narrowband target cell for the current call channel;

The first acquiring unit is configured to acquire information about the traffic channel.

In another possible implementation manner, the obtaining module further includes:

a first receiving unit, configured to receive broadcast information sent by a narrowband core network to which the narrowband serving cell belongs, where the broadcast information includes information of a traffic channel of the narrowband target cell;

a second acquiring unit, configured to acquire a traffic channel list according to the broadcast information received by the receiving unit;

a first determining unit, configured to determine whether the information of the service channel of the current call exists in the service channel list;

The triggering unit is configured to: if the information of the traffic channel of the current call does not exist in the traffic channel list, trigger the requesting core network to allocate a traffic channel to the narrowband target cell for the current call.

In another possible implementation manner, the request unit includes:

a first processing subunit, configured to send a cell handover request to the broadband core network by using the broadband cluster base station, where the cell handover request includes a call identifier of the current call and a radio location identification number LAI of the narrowband target cell, so that the broadband core The network may identify the narrowband core network to which the narrowband target cell belongs according to the LAI of the narrowband target cell, and obtain information about the current channel of the current call in the narrowband target cell;

The first obtaining unit includes:

a first acquiring subunit, configured to acquire, by the broadband cluster base station, information of a traffic channel of the current call from the broadband core network;

and / or,

Obtaining information of the traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband serving cell, and the information of the traffic channel of the current call is sent by the broadband core to the narrowband cluster base station.

In another possible implementation manner, the request unit includes:

a second processing sub-unit, configured to determine whether the current call is a group call and the group belongs to a broadband core network;

a first sending subunit, configured to send a call setup request to the narrowband core network to which the narrowband target cell belongs by using the narrowband cluster base station corresponding to the narrowband target cell if the current call is a group call and the group belongs to the broadband core network, the call Establishing, in the request, the group identifier of the group call, so that the narrowband core network to which the narrowband target cell belongs sends the call setup request to the group of home broadband core networks, and acquiring the Information of the traffic channel of the current call in the narrowband target cell;

The first obtaining unit includes:

And a second acquiring subunit, configured to acquire information about a traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband target cell.

In another possible implementation manner, the request unit includes:

a third processing sub-unit, configured to determine whether the current call is a group call and the group belongs to a narrowband core network;

a second sending subunit, configured to send a call setup request to the narrowband core network to which the narrowband target cell belongs by using the narrowband cluster base station corresponding to the narrowband target cell if the current call is a group call and the group belongs to the narrowband core network, the call The group identifier of the group call is included in the establishment request, so that the narrowband core network to which the narrowband target cell belongs is merged into the group call according to the group identifier, and information about the service channel of the current call in the narrowband target cell is obtained. ;

The first obtaining unit includes:

And a third acquiring subunit, configured to acquire information about a traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband target cell.

In another possible implementation manner, the request unit includes:

a fourth processing subunit, configured to send a cell handover request to the unified converged core network by using the broadband cluster base station, where the cell handover request includes a call identifier of the current call and a radio location identification number LAI of the narrowband target cell, so that the The unified converged core network allocates a traffic channel in the narrowband target cell according to the LAI of the narrowband target cell and the call identifier for the current call;

The first obtaining unit includes:

a fourth acquiring subunit, configured to acquire information of the traffic channel from the broadband cluster base station, where information of the traffic channel is sent by the unified converged core network to the broadband cluster base station;

and / or,

The information of the traffic channel is obtained from the narrowband cluster base station corresponding to the narrowband serving cell, and the information of the traffic channel is sent by the unified convergence core network to the narrowband cluster base station.

In another possible implementation manner, the request unit includes:

a fifth processing subunit, configured to determine whether the current call is a group call;

a third sending subunit, configured to send, by the narrowband cluster base station corresponding to the narrowband target cell, a call setup request to the unified converged core network, if the current call is a group call, where the call setup request includes The group identity of the group call, such that the unified convergence core network allocates a traffic channel in the narrowband target cell for the current call by incorporating the terminal into the group call according to the group identity;

The first obtaining unit includes:

And a fifth obtaining sub-unit, configured to acquire information of a traffic channel of the current call from the narrow-band cluster base station corresponding to the narrow-band target cell, where information of the traffic channel of the current call is sent by the unified converged core network to the narrow-band cluster base station.

In another possible implementation manner, the obtaining module includes:

a second receiving unit, configured to receive broadcast information sent by the narrowband serving cell, where the broadcast information includes service channel information of the narrowband target cell;

a third acquiring unit, configured to generate a traffic channel list according to the broadcast information received by the receiving unit;

a second determining unit, configured to determine whether the information of the service channel of the current call exists in the service channel list generated by the generating unit;

The processing unit is configured to: if the information of the traffic channel of the current call exists in the traffic channel list, obtain information about the traffic channel of the current call in the narrowband target cell from the narrowband cluster base station corresponding to the narrowband serving cell.

In a third aspect, an embodiment of the present invention provides a cell handover method, including:

The request of the core network device receiving terminal allocates a traffic channel to the narrowband target cell for the current call, and the terminal participates in the current call in the broadband serving cell, and the terminal registers in both the broadband serving cell and the narrowband serving cell;

The core network device sends the information of the traffic channel to the terminal, so that the terminal switches from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel.

In a possible implementation manner, when the core network device is the broadband core network to which the broadband serving cell belongs, the request of the core network device to receive the terminal for the current call to allocate the service channel in the narrowband target cell includes:

The broadband core network receives a cell handover request sent by the terminal through the broadband cluster base station, where the cell handover request includes the call identifier of the current call and the wireless location identification number LAI of the narrowband target cell;

The broadband core network identifies the narrowband core network to which the narrowband target cell belongs according to the LAI;

The broadband core network sends a cell handover preparation request to the narrowband core network, and the cell handover preparation is requested. And including the call identifier, so that the narrowband core network allocates a traffic channel for the current call according to the call identifier;

The broadband core network obtains information of the traffic channel from the narrowband core network through a gateway;

The sending, by the core network device, the information of the traffic channel to the terminal includes:

The broadband core network sends the information of the traffic channel to the terminal;

and / or,

The broadband core network sends the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the information of the traffic channel to the terminal.

In another possible implementation manner, when the core network device is a unified converged core network, the request of the core network device receiving the terminal for the current call to allocate the service channel in the narrowband target cell includes:

The unified converged core network receives the cell handover request sent by the terminal, where the cell handover request includes the call identifier of the current call and the radio location identification number LAI of the narrowband target cell;

The unified converged core network allocates a traffic channel to the narrowband target cell according to the call identifier for the current call;

The sending, by the core network device, the traffic channel information to the terminal includes:

The unified converged core network sends the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the information of the traffic channel to the terminal.

In another possible implementation manner, when the core network device is the narrowband core network to which the narrowband target cell belongs, the request of the core network device to receive the terminal for the current call to allocate the service channel in the narrowband target cell includes:

When the terminal determines that the current call is a group call and the group belongs to the narrowband core network, the narrowband core network to which the narrowband target cell belongs receives a call setup request sent by the terminal, where the call setup request includes the call identifier of the group call;

The narrowband core network to which the narrowband target cell belongs sends the call setup request to the group of home narrowband core networks, so that the group of home narrowband core networks according to the call identity by incorporating the terminal into the group call is the current call in the narrowband The target cell allocates a traffic channel;

The narrowband core network to which the narrowband target cell belongs receives the industry feedback of the group of narrowband core networks Information of the traffic channel;

The narrowband core network to which the narrowband target cell belongs transmits the information of the traffic channel to the terminal.

When the terminal determines that the current call is a group call and the group belongs to the broadband core network, the narrowband core network to which the narrowband target cell belongs receives a call setup request sent by the terminal, where the call setup request includes the call identifier of the group call;

The narrowband core network to which the narrowband target cell belongs sends the call setup request to the group of home broadband core networks, so that the group of home broadband core networks according to the call identity by incorporating the terminal into the group call is the current call in the narrowband The target cell allocates a traffic channel;

The narrowband core network to which the narrowband target cell belongs receives information of the traffic channel fed back by the group of home broadband core networks;

In another possible implementation manner, when the core network device is the unified converged core network, the request of the core network device receiving the terminal for the current call to allocate the service channel in the narrowband target cell includes:

When the terminal determines that the current call is a group call, the unified convergence core network receives a call setup request sent by the terminal, where the call setup request includes a call identifier of the group call;

The unified converged core network allocates a traffic channel in the narrowband target cell for the current call according to the call identity of the group call by incorporating the terminal into the group call;

The unified converged core network sends the information of the traffic channel to the terminal.

In a fourth aspect, a core network device is provided in the embodiment of the present invention, including:

An allocation module, configured to receive, by the terminal, a service channel for the current call in the narrowband target cell, where the terminal participates in the current call in the broadband serving cell, where the terminal is registered in the broadband serving cell and the narrowband serving cell;

a sending module, configured to send information of the traffic channel to the terminal, so that the terminal according to the The information of the traffic channel is handed over from the broadband serving cell to the narrowband target cell to continue the current call.

In a possible implementation manner, when the core network device is a broadband core network to which the broadband serving cell belongs, the allocation module includes:

The first receiving unit is configured to send, by the terminal, a cell handover request sent by the broadband cluster base station, where the cell handover request includes the call identifier of the current call and the wireless location identification number LAI of the narrowband target cell in the cell handover request;

An identifying unit, configured to identify, according to the LAI, a narrowband core network to which the narrowband target cell belongs;

a first sending unit, configured to send a cell handover preparation request to the narrowband core network, where the cell handover preparation request includes the call identifier, so that the narrowband core network allocates a traffic channel for the current call according to the call identifier;

a first acquiring unit, configured to obtain, by using a gateway, information about the traffic channel from the narrowband core network;

The sending module includes:

a second sending unit, configured to send information of the traffic channel to the terminal;

and / or,

Transmitting the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the information of the traffic channel to the terminal.

In another possible implementation, when the core network device is a unified core network, the allocation module includes: a second receiving unit, configured to receive a cell handover request sent by the terminal, where the cell handover request includes a call identifier of the current call. And a wireless location identification number LAI of the narrowband target cell;

a processing unit, configured to allocate a traffic channel to the narrowband target cell according to the call identifier for the current call;

The sending module includes:

The third sending unit is configured to send the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the information of the traffic channel to the terminal.

In another possible implementation manner, when the core network device is a narrowband core network to which the narrowband target cell belongs, the allocation module includes:

a third receiving unit, configured to: when the terminal determines that the current call is a group call and the group belongs to the narrowband core network, receive a call setup request sent by the terminal, where the call setup request includes a call identifier of the group call;

a fourth sending unit, configured to send the call setup request to the group of home narrowband core networks, so that the group of home narrowband core networks according to the call identity by incorporating the terminal into the group call is the current call in the narrowband target cell Allocating traffic channels;

a fourth receiving unit, configured to receive information about the traffic channel fed back by the group of the narrowband core network;

The sending module includes:

And a fifth sending unit, configured to send information of the traffic channel to the terminal.

a fifth receiving unit, configured to: when the terminal determines that the current call is a group call and the group belongs to the broadband core network, receive a call setup request sent by the terminal, where the call setup request includes a call identifier of the group call;

a sixth sending unit, configured to send the call setup request to the group of home broadband network, so that the group of home broadband core networks according to the call identity by incorporating the terminal into the group call is the current call in the narrowband target cell Allocating a traffic channel; a sixth receiving unit, configured to receive information about the traffic channel fed back by the group of home broadband core networks;

The sending module includes:

And a seventh sending unit, configured to send information of the traffic channel to the terminal.

In another possible implementation manner, when the core network device is the unified and integrated core network, the allocation module includes:

a seventh receiving unit, configured to receive a call setup request sent by the terminal, where the call setup request includes a call identifier of the group call;

An allocating unit, configured to allocate a traffic channel to the narrowband target cell for the current call by combining the terminal into the group call according to the call identity of the group call; the sending module includes:

And an eighth sending unit, configured to send information of the traffic channel to the terminal.

In a fifth aspect, an embodiment of the present invention provides a terminal, including:

Transceiver, processor and bus;

The transceiver is coupled to the processor via the bus;

The processor has the following functions: participating in a current call in a broadband serving cell, and the terminal is registered in both the broadband serving cell and the narrowband serving cell;

The transceiver has the function of acquiring a traffic channel of a current call in a narrowband target cell information;

The processor has a function of switching from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel acquired by the acquiring module.

In a sixth aspect, a core network device is provided in the embodiment of the present invention, including:

Transceiver, processor and bus;

The transceiver is coupled to the processor via the bus;

The processor has the following functions: the request of the receiving terminal allocates a traffic channel to the narrowband target cell for the current call, and the terminal participates in the current call in the broadband serving cell, and the terminal registers in both the broadband serving cell and the narrowband serving cell;

The transceiver has the function of transmitting the traffic channel information acquired by the processing module to the terminal, so that the terminal switches from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel.

It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

In the embodiment of the present invention, the terminal that participates in the current call in the broadband serving cell can obtain the information of the current channel of the current call existing in the narrowband target cell, and can switch from the broadband serving cell to the narrowband target cell according to the obtained information of the traffic channel. The current call, through the above scheme, enables the dual-mode terminal to switch from the broadband serving cell to the narrow-band target cell when moving to a region where the broadband wireless signal coverage is not good and the narrow-band wireless signal covers well, and continues to hold the call to avoid dropped calls.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

FIG. 1 is a schematic structural diagram of a network architecture of a gateway interconnection;

2 is a schematic structural diagram of a unified and converged network architecture;

3 is a schematic flowchart of a cell handover method according to an embodiment of the present invention;

4 is a schematic diagram of signaling interaction of a cell handover method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another signaling interaction of a cell handover method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of another signaling interaction of a cell handover method according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of another signaling interaction of a cell handover method according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another signaling interaction of a cell handover method according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of another signaling interaction of a cell handover method according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of another signaling interaction of a cell handover method according to an embodiment of the present invention;

11 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

12 is another schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a core network device according to an embodiment of the present invention;

FIG. 14 is another schematic structural diagram of a core network device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be described with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The cell handover method provided by the embodiment of the present invention can be applied to a network architecture of a gateway interconnection, and can also be applied to a unified and converged network architecture. The terminal mentioned in the embodiment of the present invention is a dual mode terminal supporting both a broadband system and a narrowband system, and the terminal is in a dual standby mode, that is, the terminal is simultaneously registered in the broadband serving cell and the narrowband serving cell and is in the network, and the terminal is passing the broadband. The serving cell participates in a call (single call or group call). The cell handover method provided by the embodiment of the present invention enables the terminal to switch from the broadband serving cell to the narrowband target cell when moving to an area where the coverage of the broadband wireless signal is not good and the coverage of the narrowband wireless signal is good, and the call is continued to avoid call drop. The terminal mentioned in the embodiment of the present invention may be a walkie-talkie.

The following describes the cell handover method provided by the embodiment of the present invention in the network architecture of the gateway interconnection. Referring to FIG. 3, the cell handover method in this embodiment includes:

301. The terminal participates in a current call in a broadband serving cell, and the terminal is registered in both the broadband serving cell and the narrowband serving cell.

The terminal initiates a current call in the broadband serving cell, and the terminal is a cluster dual mode terminal. That is, the terminal can make a call in the broadband serving cell, or can make a call in the narrowband serving cell.

302. The terminal acquires information about a service channel of a current call existing in the narrowband target cell.

In a specific implementation, the terminal can simultaneously monitor the current serving cell of the broadband cluster system (ie, broadband service) Signal quality of the cell (eg, measurable from reference signal received power RSRP or reference signal received quality RSRQ) and signal quality of the current serving cell (ie, narrowband serving cell) of the narrowband trunk system and its neighbors (eg, based on received signal strength) Indicating the RSSI or the error rate BER to determine whether the handover condition is currently satisfied by a preset decision algorithm, for example, when the signal quality of the broadband serving cell is lower than the first preset threshold, and the signal of the narrowband serving cell or its neighboring cell If the quality is higher than the second preset threshold, it is considered that the switching condition is met, and the second preset threshold is greater than or equal to the first preset threshold.

When it is determined that the handover condition is met and it is determined that the handover is required, the terminal needs to acquire information of the traffic channel of the current call existing in the narrowband target cell.

The traffic channel of the current call existing in the narrowband target cell may be allocated before the handover (for example, the narrowband target cell itself has a member belonging to the current call, the narrowband target cell has participated in the current call); or the narrowband target cell exists. The traffic channel of the current call is allocated in real time during handover (for example, the narrowband target cell does not participate in the current call, and the narrowband core network to which the narrowband target cell belongs receives the request of the terminal, and controls the narrowband cluster base station corresponding to the narrowband target cell, in the narrowband target The cell allocates a traffic channel to the current call in real time).

The information of the traffic channel of the current call existing in the narrowband target cell may include a channel number (Channel No), a slot number (Slot No), an Align Mode, and the like of the traffic channel. In addition, the narrowband core network to which the narrowband target cell belongs may also send information of the control channel of the narrowband target cell to the terminal.

303. The terminal switches from the broadband serving cell to the narrowband target cell according to the obtained information of the traffic channel to continue the current call.

If the traffic channel of the current call existing in the narrowband target cell is allocated before the handover, and the neighboring cell list of the narrowband serving cell includes the narrowband target cell, the method for the terminal to acquire the information of the traffic channel is as follows: the network structure of the gateway interconnection When the first member of the current call requests the information of the traffic channel of the narrowband target cell, the narrowband cluster base station corresponding to the narrowband target cell is controlled by the narrowband core network to which the narrowband target cell belongs, and the traffic channel is allocated for the current call in the narrowband target cell. After the allocation is completed, the information of the traffic channel is fed back to the first requesting member, and the narrowband core network to which the narrowband target cell belongs is also sent to the narrowband service through the narrowband core network to which the narrowband serving cell belongs. The narrow-band cluster base station corresponding to the cell may be sent by the narrow-band cluster base station corresponding to the narrow-band serving cell when the terminal is to be switched to the narrow-band target cell and needs to obtain the information of the service channel. The broadcast message is sent to obtain the information of the traffic channel of the current call existing in the narrowband target cell; and in the unified network architecture, when the first member of the current call requests the information of the traffic channel of the narrowband target cell, the narrowband target cell corresponds to The narrowband cluster base station is controlled by the unified converged core network, and allocates a traffic channel for the current call in the narrowband target cell. After the allocation is completed, the information of the traffic channel is fed back to the first requesting member, and the unified converged core network will also be The information of the traffic channel is sent to the narrowband cluster base station corresponding to the narrowband serving cell. When the terminal wants to switch to the narrowband target cell and needs to obtain the information of the traffic channel, the terminal may send the broadcast message through the narrowband cluster base station corresponding to the narrowband serving cell. Obtaining information of a traffic channel of a current call existing in the narrowband target cell.

The following embodiments describe in detail a method for a terminal to request a core network to allocate a traffic channel for a current call and obtain information of a traffic channel in a narrowband target cell. 4 to 8 correspond to the network structure of the gateway interconnection, and FIG. 9 to FIG. 10 correspond to the unified and integrated network architecture.

Referring to FIG. 4, in this embodiment, the narrowband cluster base station corresponding to the narrowband target cell is allocated to the current call in real time under the control of the narrowband core network to which the narrowband target cell belongs, and the current call is a single call, and the terminal is currently In the broadband serving cell, to switch to the narrowband target cell to continue the current call, the specific methods include:

After determining that the cell handover is required, the terminal sends a cell handover request to the broadband core network through the broadband cluster base station, where the cell handover request includes a call identifier of the current call, and a LAI of the narrowband target cell;

The broadband core network queries the calling and called addresses according to the call identity, obtains the narrowband core network to which the narrowband target cell belongs according to the LAI of the narrowband target cell, and sends a SIP REFER message to the gateway (Gateway, GW), where the SIP REFER message carries the calling and called addresses. And the LAI of the narrowband target cell;

The gateway converts the SIP REFER message into PSIP PREPARE signaling, and sends PSIP PREPARE signaling to the narrowband core network to which the narrowband target cell belongs;

The narrowband core network to which the narrowband target cell belongs returns a PSIP 200 OK to the gateway, and the PSIP 200 OK carries the handover number (Handover No). After the gateway obtains the handover number, the gateway sends a PSIP INVITE request to the narrowband core network to which the narrowband target cell belongs. The PSIP INVITE request includes the calling and called addresses and the handover number. After receiving the PSIP INVITE request, the narrowband core network to which the narrowband target cell belongs, controls the narrowband cluster base station corresponding to the narrowband target cell to allocate the traffic channel for the current call in the narrowband target cell. And then send the PSIP 200 OK to the gateway, which carries the narrowband target in the PSIP 200 OK Information of the traffic channel allocated for the current call in the cell;

The gateway returns a SIP 200 OK to the broadband core network, where the SIP 200 OK includes information about the traffic channel of the current call in the narrowband target cell, and then the gateway sends a PSIP ACK to the narrowband core network to which the narrowband target cell belongs;

After receiving the SIP 200 OK carrying the information of the traffic channel of the current call in the narrowband target cell, the broadband core network sends a cell handover response to the terminal through the broadband cluster base station, where the cell handover response includes the service of the current call in the narrowband target cell. Channel information;

After receiving the cell handover response, the terminal switches from the broadband serving cell to the narrowband target cell to continue the current call.

In the above process, the information of the service channel of the current call in the narrowband target cell is sent to the terminal through the broadband air interface. In practice, the information of the service channel in the narrowband target cell that exists on the current call may be sent to the terminal through the narrowband air interface. That is, after the broadband core network receives the SIP 200 OK carrying the information of the traffic channel of the current call in the narrowband target cell, the SIP NOTIFY may also be sent to the gateway, and after the gateway receives the SIP NOTIFY, the narrowband core belongs to the narrowband serving cell. The network sends a PSIP NOTIFY to the narrow-band cluster base station corresponding to the narrow-band serving cell, and the narrow-band cluster base station corresponding to the narrow-band serving cell sends the P_BCAST to the terminal after receiving the PSIP NOTIFY, wherein the SIP NOTIFY, PSIP NOTIFY, and P_BCAST both exist in the narrow-band target cell. Information about the traffic channel of the current call. In addition, in order to increase the reliability of the communication, information of the traffic channel in which the current call exists in the narrowband target cell may be simultaneously transmitted to the terminal through the broadband air interface and the narrowband air interface.

In addition, the method shown in FIG. 4 is also applicable to the traffic channel of the current call existing in the narrowband target cell, which is allocated before the handover, but the narrowband target cell does not include the narrowband target cell in the neighboring cell list. In this case, the narrowband After receiving the PSIP PREPARE signaling command sent by the gateway, the narrowband core network to which the target cell belongs directly returns the PSIP200 OK carrying the information of the traffic channel to the gateway, and the subsequent gateway does not need to send the PSIP INVITE to the narrowband core network to which the narrowband target cell belongs. Directly feed the SIP 200 OK to the broadband core network.

Referring to FIG. 5, in this embodiment, the narrowband cluster base station corresponding to the narrowband target cell is allocated for the current call in real time under the control of the narrowband core network to which the narrowband target cell belongs, and the current call is a group call, and the group belongs to the broadband. The core network, the terminal is currently in the broadband serving cell, and wants to switch to the narrowband target cell to continue the current call, and the specific methods include:

The broadband core network queries the calling and called address according to the call identifier, obtains the narrowband core network to which the narrowband target cell belongs according to the LAI of the narrowband target cell, and sends a SIP REFER message to the gateway, where the SIP REFER message carries the identifier of the terminal that initiates the cell handover request, The primary and called addresses and the LAI of the narrowband target cell;

The narrowband core network to which the narrowband target cell belongs returns a PSIP 200 OK to the gateway, and the PSIP 200 OK carries the handover number (Handover No). After the gateway obtains the handover number, the gateway sends a PSIP INVITE request to the narrowband core network to which the narrowband target cell belongs. The PSIP INVITE request includes the calling and called addresses and the handover number. After receiving the PSIP INVITE request, the narrowband core network to which the narrowband target cell belongs, controls the narrowband cluster base station corresponding to the narrowband target cell to allocate the traffic channel for the current call in the narrowband target cell. And then sending a PSIP 200 OK to the gateway, the PSIP 200 OK carrying information of the traffic channel allocated for the current call in the narrowband target cell;

The gateway sends a PSIP ACK to the narrowband core network to which the narrowband target cell belongs, and then the gateway returns a SIP 200 OK to the broadband core network, where the SIP 200 OK includes information of the service channel in the narrowband target cell where the current call exists;

In the above process, the information of the service channel of the current call in the narrowband target cell is sent to the terminal through the broadband air interface. In practice, the information of the service channel in the narrowband target cell that exists on the current call may be sent to the terminal through the narrowband air interface. That is, after the broadband core network receives the SIP 200 OK carrying the information of the traffic channel of the current call in the narrowband target cell, the SIP NOTIFY may also be sent to the gateway, and after the gateway receives the SIP NOTIFY, the narrowband core belongs to the narrowband serving cell. network Sending a PSIP NOTIFY to the narrow-band cluster base station corresponding to the narrow-band serving cell, and the narrow-band cluster base station corresponding to the narrow-band serving cell sends the P_BCAST to the terminal after receiving the PSIP NOTIFY, where the SIP NOTIFY, the PSIP NOTIFY, and the P_BCAST each include the current presence in the narrow-band target cell. Information about the traffic channel of the call. In addition, in order to increase the reliability of the communication, information of the traffic channel in which the current call exists in the narrowband target cell may be simultaneously transmitted to the terminal through the broadband air interface and the narrowband air interface.

In addition, the method shown in FIG. 5 is also applicable to the traffic channel of the current call existing in the narrowband target cell, which is allocated before the handover, but the narrowband target cell does not include the narrowband target cell in the neighboring cell list. In this case, the narrowband After receiving the PSIP PREPARE signaling command sent by the gateway, the narrowband core network to which the target cell belongs directly returns the PSIP200 OK carrying the information of the traffic channel to the gateway, and the subsequent gateway does not need to send the PSIP INVITE to the narrowband core network to which the narrowband target cell belongs. Directly feed the SIP 200 OK to the broadband core network.

Referring to FIG. 6, in this embodiment, the narrowband cluster base station corresponding to the narrowband target cell is allocated for the current call in real time under the control of the narrowband core network to which the narrowband target cell belongs, and the current call is a group call, and the group belongs to a narrowband. The core network, the terminal is currently in the broadband serving cell, and wants to switch to the narrowband target cell to continue the current call, and the specific methods include:

The gateway converts the SIP REFER message into PSIP PREPARE signaling, and sends PSIP PREPARE signaling to the narrowband core network to which the group belongs;

The group-owned narrowband core network forwards the PSIP PREPARE signaling to the narrowband core network to which the narrowband target cell belongs;

The narrowband core network to which the narrowband target cell belongs returns a PSIP 200 OK to the narrowband core network to which the group belongs, and the PSIP 200 OK carries the handover number (Handover No), and the narrowband core network to which the group belongs obtains the handover number to the narrowband target The narrowband core network to which the cell belongs sends a PSIP INVITE request. Therefore, the PSIP INVITE request includes the calling and called address and the handover number, and the narrowband core network to which the narrowband target cell belongs receives the PSIP INVITE request, and controls the narrowband cluster base station corresponding to the narrowband target cell to allocate the service to the current call in the narrowband target cell. The channel then sends a PSIP 200 OK to the narrowband core network to which the group belongs, and the PSIP 200 OK carries information of the traffic channel allocated for the current call in the narrowband target cell;

The narrowband core network to which the group belongs sends a PSIP ACK to the narrowband core network to which the narrowband target cell belongs, and then forwards the PSIP 200 OK to the gateway;

The gateway returns a SIP 200 OK to the broadband core network, where the SIP 200 OK includes information about the service channel of the current call in the narrowband target cell;

In the above process, the information of the service channel of the current call in the narrowband target cell is sent to the terminal through the broadband air interface. In practice, the information of the service channel in the narrowband target cell that exists on the current call may be sent to the terminal through the narrowband air interface. That is, after receiving the PSIP 200 OK carrying the information of the traffic channel of the current call in the narrowband target cell, the narrowband core network to which the group belongs may also pass the narrowband core network to which the narrowband serving cell belongs to the narrowband trunk base station corresponding to the narrowband serving cell. After the PSIP NOTIFY is sent, the narrowband trunking base station corresponding to the narrowband serving cell receives the PSIP STOPIFY, and then sends the P_BCAST to the terminal, where the PSIP NOTIFY and the P_BCAST both contain the information of the traffic channel in the narrowband target cell where the current call exists. In addition, in order to increase the reliability of the communication, information of the traffic channel in which the current call exists in the narrowband target cell may be simultaneously transmitted to the terminal through the broadband air interface and the narrowband air interface.

In addition, the method shown in FIG. 6 is also applicable to the traffic channel of the current call existing in the narrowband target cell, which is allocated before the handover, but the narrowband target cell does not include the narrowband target cell in the neighboring cell list. In this case, the narrowband After receiving the PSIP PREPARE signaling command sent by the gateway, the narrowband core network to which the target cell belongs directly returns the PSIP200 OK carrying the information of the traffic channel to the gateway, and the narrowband core network to which the subsequent group belongs does not need to be narrowband to the narrowband target cell. Core Network Send the PSIP INVITE and directly feed back to the gateway the PSIP 200 OK carrying the information of the traffic channel.

In the above embodiments, the terminal performs cell handover by initiating a cell handover request in the broadband cluster base station. In other embodiments of the present invention, if the current call is a group call, the terminal may also correspond to the narrowband target cell. The narrowband cluster base station directly initiates a call setup request to implement cell handover. For details, refer to FIG. 7 and FIG. 8.

In FIG. 7, the narrowband cluster base station corresponding to the narrowband target cell is allocated for the current call in real time under the control of the narrowband core network to which the narrowband target cell belongs, and the current call is a group call, and the group belongs to the broadband core network, and the terminal is currently in the The broadband serving cell wants to switch to the narrowband target cell to continue the current call, and the specific methods include:

After determining that the cell handover is required, the terminal sends a call setup request to the narrowband core network to which the narrowband target cell belongs by using the narrowband cluster base station corresponding to the narrowband target cell, where the call setup request includes the group identifier of the group call, and the group identifier may be a group address. In addition, the call setup request may further include a call type (ie, a group call), an address of the terminal, and the like;

The narrowband core network to which the narrowband target cell belongs sends a PSIP INVITE message to the gateway, where the PSIP INVITE message includes the group identifier, the address of the terminal, and the like;

The gateway converts the PSIP INVITE message into a SIP INVITE message, and sends the SIP INVITE message to the broadband core network;

The broadband core network finds that the group call identified by the group identifier has been established, so the terminal is directly incorporated into the existing group call as a group member, and then sends a SIP 200 OK to the gateway, and the SIP 200 OK includes the group (Merge Group) and the calling address of the group call;

The gateway sends a PSIP 200 OK to the narrowband core network to which the narrowband target cell belongs, and the PSIP 200 OK includes a Merge Group identifier and a calling address of the group call;

After receiving the PSIP 200 OK, the narrowband core network to which the narrowband target cell belongs receives the PSIP ACK, and after receiving the PSIP ACK, the gateway sends a SIP ACK to the broadband core network; then the narrowband core network to which the narrowband target cell belongs controls the narrowband target cell. The narrowband cluster base station allocates a traffic channel for the current call in the narrowband target cell, and after the allocation is completed, sends a call setup response to the terminal through the narrowband cluster base station corresponding to the narrowband target cell, where the call setup response includes the current call service existing in the narrowband target cell. Channel information;

After receiving the call setup response, the terminal switches from the broadband serving cell to the narrowband target cell to continue the current call.

In addition, the method shown in FIG. 7 is also applicable to the traffic channel of the current call existing in the narrowband target cell, which is allocated before the handover, but the narrowband target cell does not include the narrowband target cell in the neighboring cell list. In this case, the narrowband The narrowband core network to which the target cell belongs sends a PSIP ACK to the gateway, and directly sends a call setup response carrying the information of the traffic channel to the terminal through the narrowband cluster base station corresponding to the narrowband target cell, and does not need to allocate the traffic channel again.

In FIG. 8, the narrowband cluster base station corresponding to the narrowband target cell is allocated for the current call in real time under the control of the narrowband core network to which the narrowband target cell belongs, and the current call is a group call, and the group belongs to the narrowband core network, and the terminal is currently in the network. The broadband serving cell wants to switch to the narrowband target cell to continue the current call, and the specific methods include:

The narrowband core network to which the narrowband target cell belongs sends a PSIP INVITE message to the narrowband core network to which the group belongs, and the PSIP INVITE message includes the group identifier, the address of the terminal, and the like;

The group-owned narrowband core network finds that the group call identified by the group identifier has been established, so the terminal is directly incorporated into the existing group call as a group member, and then sends a PSIP 200 OK to the narrowband core network to which the narrowband target cell belongs. The PSIP 200 OK includes a Merge Group identifier and a calling address of the group call;

After receiving the PSIP 200 OK, the narrowband core network to which the narrowband target cell belongs sends a PSIP ACK to the narrowband core network to which the group call belongs, and then controls the narrowband cluster base station corresponding to the narrowband target cell to allocate a traffic channel for the current call in the narrowband target cell, and the allocation is completed. And transmitting, by the narrowband cluster base station corresponding to the narrowband target cell, a call setup response, where the call setup response includes information of a traffic channel of the current call existing in the narrowband target cell;

In addition, the method shown in FIG. 8 is also applicable to the traffic channel of the current call existing in the narrowband target cell. For the case where the narrowband target cell is not included in the neighboring cell list of the narrowband serving cell, in this case, the narrowband core network to which the narrowband target cell belongs sends the PSIP ACK to the gateway, and directly passes through the narrowband target cell. The narrowband cluster base station may send a call setup response carrying the information of the traffic channel to the terminal, and does not need to allocate the traffic channel again.

The above embodiments describe the method for the terminal to obtain the information of the current traffic channel when the traffic channel is allocated in real time under the network architecture of the gateway interconnection. The following embodiments will introduce the unified convergence network architecture, when the traffic channel For the method of real-time allocation, the terminal acquires the information of the current traffic channel, please refer to FIG. 9 and FIG.

In FIG. 9, the traffic channel is a narrowband cluster base station corresponding to the narrowband target cell, and is allocated to the current call in real time under the control of the unified convergence core network. The current call is a single call or a group call, and the terminal is currently in a broadband serving cell, and is to be switched. The current call is continued to the narrowband target cell, and the specific methods include:

After determining that the cell handover is required, the terminal sends a cell handover request to the unified converged core network through the broadband cluster base station, where the cell handover request includes a call ID of the current call, and a LAI of the narrowband target cell;

The unified converged core network controls the narrowband cluster base station corresponding to the narrowband target cell to allocate a traffic channel to the current call in the narrowband target cell. After the allocation is completed, the cell handover response is sent to the terminal through the broadband cluster base station, where the cell handover response includes the current presence in the narrowband target cell. The information of the traffic channel of the call, and the information about the control channel of the narrowband target cell may also be included in the cell handover response;

In the above process, the information of the service channel of the current call in the narrowband target cell is sent to the terminal through the broadband air interface. In practice, the information of the service channel in the narrowband target cell that exists on the current call may be sent to the terminal through the narrowband air interface. That is, the unified converged core network may also send P_BCAST to the terminal through the narrowband cluster base station corresponding to the narrowband serving cell, where P_BCAST includes information of the service channel in the narrowband target cell where the current call exists. In addition, in order to increase the reliability of the communication, information of the traffic channel in which the current call exists in the narrowband target cell may be simultaneously transmitted to the terminal through the broadband air interface and the narrowband air interface.

In addition, the method shown in FIG. 9 is also applicable to the traffic channel of the current call existing in the narrowband target cell, which is allocated before the handover, but the neighboring cell list of the narrowband serving cell does not include the narrowband target cell. In this case, after receiving the cell handover request sent by the broadband cluster base station, the unified convergence core network directly transmits the cell handover response carrying the information of the traffic channel to the terminal through the broadband cluster base station, and does not need to allocate the service again. channel.

In FIG. 10, the narrowband cluster base station corresponding to the narrowband target cell is allocated for the current call in real time under the control of the unified converged core network, and the current call is a group call, and the terminal is currently in a broadband serving cell, and wants to switch to the narrowband target cell. Continue the current call, including:

After determining that the cell handover is required, the terminal sends a call setup request (C_RAND) to the unified converged core network through the narrowband cluster base station corresponding to the narrowband target cell, where the call setup request includes the group identifier of the group call, and the group identifier may be a group address, and The call setup request may further include a call type (ie, a group call), an address of the terminal, and the like;

The unified converged core network finds that the group call identified by the group identifier is established, so the terminal is directly incorporated into the existing group call as a group member, and then the narrowband target base station corresponding to the narrowband target cell is controlled to be the current in the narrowband target cell. After the allocation is completed, the call setup response (MT_GRANT) is sent to the terminal through the narrowband cluster base station corresponding to the narrowband target cell, and the call setup response includes the information of the service channel of the current call in the narrowband target cell, and the call setup is performed. The response may also include information of a control channel of the narrowband target cell;

In addition, the method shown in FIG. 10 is also applicable to the traffic channel of the current call existing in the narrowband target cell, which is allocated before the handover, but the narrowband target cell does not include the narrowband target cell in the neighboring cell list. In this case, the unified After receiving the call setup request sent by the broadband cluster base station, the fused core network directly transmits the call setup response carrying the information of the traffic channel to the terminal through the narrowband cluster base station corresponding to the narrowband target cell, and does not need to allocate the traffic channel again.

The terminal provided by the embodiment of the present invention is described below. Referring to FIG. 11, the terminal 1100 of this embodiment includes:

The calling module 1101 is configured to participate in a current call in a broadband serving cell, where the terminal is registered in both the broadband serving cell and the narrowband serving cell;

The obtaining module 1102 is configured to acquire information about a service channel of a current call in the narrowband target cell.

The processing module 1103 is configured to use the information about the traffic channel acquired by the acquiring module from the broadband The serving cell switches to the narrowband target cell to continue the current call.

Optionally, the obtaining module 1102 includes:

a requesting unit, configured to request the core network device to allocate a traffic channel to the narrowband target cell for the current call;

Optionally, the obtaining module 1102 further includes:

The triggering unit is configured to: if the information of the traffic channel of the current call does not exist in the traffic channel list, trigger the requesting core network device to allocate a traffic channel to the narrowband target cell for the current call.

Optionally, the request unit includes:

The first obtaining unit includes:

and / or,

Optionally, the request unit includes:

a first sending subunit, configured to: if the current call is a group call and the group belongs to a broadband core network, pass The narrowband cluster base station corresponding to the narrowband target cell sends a call setup request to the narrowband core network to which the narrowband target cell belongs, where the call setup request includes the group identifier of the group call, so that the narrowband core network to which the narrowband target cell belongs The group home broadband core network sends the call setup request, and acquires information about the service channel of the current call in the narrowband target cell;

The first obtaining unit includes:

Optionally, the request unit includes:

The first obtaining unit includes:

Optionally, the request unit includes:

The first obtaining unit includes:

and / or,

Optionally, the request unit includes:

a third sending sub-unit, configured to send, by the narrow-band cluster base station corresponding to the narrow-band target cell, a call setup request to the unified converged core network, where the current call is a group call, where the call setup request includes a group identifier of the group call, So that the unified converged core network allocates a traffic channel in the narrowband target cell for the current call by incorporating the terminal into the group call according to the group identifier;

The first obtaining unit includes:

Optionally, the obtaining module 1102 includes:

The terminal in the embodiment of the present invention may perform the cell handover method in any one of the method embodiments of FIG. 3 to FIG. 10. The technical implementation process and the technical effect may refer to the detailed description of the corresponding method embodiment, and details are not described herein again.

The following describes the terminal in the foregoing embodiment from the perspective of the hardware device. Referring to FIG. 12, the terminal 1200 in this embodiment includes:

a transceiver 1201, a processor 1202 and a bus 1203;

The transceiver 1201 is connected to the processor 1202 through the bus 1203;

The bus 1203 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For For ease of representation, only one thick line is shown in Figure 12, but it does not mean that there is only one bus or one type of bus.

The processor 1202 may be a central processing unit (CPU), a network processor (NP) or a combination of a CPU and an NP.

The processor 1202 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (GAL) or any combination.

The processor 1202 has the following functions: participating in a current call in a broadband serving cell, where the terminal is registered in both the broadband serving cell and the narrowband serving cell;

The transceiver 1201 has the function of: acquiring information of a traffic channel of a current call in a narrowband target cell;

The processor 1202 has a function of: switching from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel acquired by the acquiring module. In addition, the terminal 1200 in this embodiment may further include a memory 1204, which may include a volatile memory, such as a random-access memory (RAM); the memory may also include a non-easy memory. Non-volatile memory, such as a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); the memory 1204 may also include the above-described types of memory. The combination. The memory 1204 is used to store software programs and cache data, and the transceiver 1201 and the memory 1204 are communicatively coupled to the processor 1202 via a bus 1203.

In a specific implementation, the transceiver 1201 may have two sets, one set for obtaining information of a traffic channel from a broadband cluster base station, and one set for obtaining information of a traffic channel from a narrowband cluster base station.

The terminal 1200 of this embodiment may further perform other steps of the foregoing method embodiments, and details are not described herein again.

The following describes the core network provided by the embodiment of the present invention. Referring to FIG. 13, the core network device 1300 of this embodiment includes:

The allocating module 1301 is configured to receive, by the terminal, a service channel for the current call in the narrowband target cell, where the terminal participates in the current call in the broadband serving cell, where the terminal is registered in the broadband serving cell and the narrowband serving cell;

The sending module 1302 is configured to send information about the traffic channel to the terminal, so that the terminal switches from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel.

Optionally, when the core network device is a broadband core network to which the broadband serving cell belongs, the allocating module 1301 includes:

The sending module 1302 includes:

and / or,

Optionally, when the core network device is a unified fused core network, the allocating module 1301 includes: a second receiving unit, configured to receive a cell handover request sent by the terminal, where the cell handover request includes a call identifier of the current call, and the narrowband The wireless location identification number LAI of the target cell;

The sending module 1302 includes:

a third sending unit, configured to send the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the service letter to the terminal Road information.

Optionally, when the core network device is a narrowband core network to which the narrowband target cell belongs, the allocating module 1301 includes:

The sending module 1302 includes:

Optionally, when the core network device is the unified and integrated core network, the allocation module includes:

The following describes the core network device of the foregoing embodiment from the perspective of a hardware device. Referring to FIG. 14, the core network device 1400 of this embodiment includes:

Transceiver 1401, processor 1402 and bus 1403;

The transceiver 1401 is connected to the processor 1402 via the bus 1403;

The bus 1403 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 14, but it does not mean that there is only one bus or one type of bus.

The processor 1402 may be a central processing unit (CPU), a network processor (NP) or a combination of a CPU and an NP.

The processor 1402 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (GAL) or any combination.

The processor 1402 has the following functions: the request of the receiving terminal allocates a traffic channel to the narrowband target cell for the current call, and the terminal participates in the current call in the broadband serving cell, and the terminal registers in both the broadband serving cell and the narrowband serving cell;

The transceiver 1401 has a function of: transmitting the traffic channel information acquired by the processing module to the terminal, so that the terminal switches from the broadband serving cell to the narrowband target cell according to the information of the traffic channel to continue the current call. .

In addition, the core network 1400 in this embodiment may further include a memory 1404, which may include a volatile memory, such as a random-access memory (RAM); the memory may also include a non-volatile memory. Non-volatile memory, such as a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); the memory 1404 may also include the above-mentioned types. A combination of memories. The memory 1404 is used to store software programs and cache data, and the transceiver 1401 and the memory 1404 are communicatively coupled to the processor 1402 via a bus 1403.

The core network device 1400 of this embodiment may also perform other steps of the foregoing method embodiments, I won't go into details here.

In addition, it should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as the cells may or may not be physical. Units can be located in one place or distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and specifically, one or more communication buses or signal lines can be realized. Those of ordinary skill in the art can understand and implement without any creative effort.

From the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of hardware, such as analog circuits, digital circuits or dedicated circuits. However, for the purposes of the present invention, software program implementation is a better implementation in more cases. Based on such understanding, the technical solution of the present invention can be implemented in the form of a software product stored in a readable storage medium, such as a computer floppy disk, a flash memory (English: flash memory), a hard disk, only Read-Only Memory (ROM), Random Access Memory (RAM), or optical disk, etc., including instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to execute The method of various embodiments of the present invention.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A cell switching method, comprising:

The terminal participates in the current call in the broadband serving cell, and the terminal is registered in both the broadband serving cell and the narrowband serving cell;

Obtaining, by the terminal, information about a service channel of a current call in a narrowband target cell;

The terminal switches from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel.
The method according to claim 1, wherein the acquiring, by the terminal, the information of the traffic channel of the current call in the narrowband target cell comprises:

The terminal requests the core network device to allocate a traffic channel to the narrowband target cell for the current call;

The terminal acquires information of the traffic channel.
The method according to claim 2, wherein the terminal requests the core network device to allocate a traffic channel to the narrowband target cell for the current call, and after the terminal participates in the current call in the broadband serving cell, the method further include:

Receiving, by the terminal, broadcast information sent by a narrowband core network to which the narrowband serving cell belongs, where the broadcast information includes information of a traffic channel of the narrowband target cell;

The terminal acquires a traffic channel list according to the broadcast information;

Determining, by the terminal, information about a service channel of the current call in the service channel list;

If the information of the traffic channel of the current call does not exist in the traffic channel list, triggering, by the terminal, the core network device to allocate a traffic channel to the narrowband target cell for the current call.
The method according to claim 2 or 3, wherein the requesting the core network device to allocate a traffic channel to the narrowband target cell for the current call comprises:

The terminal sends a cell handover request to the broadband core network by using the broadband cluster base station, where the cell handover request includes the call identifier of the current call and the wireless location identification number LAI of the narrowband target cell, so that the broadband core network Identifying, by the LAI of the narrowband target cell, a narrowband core network to which the narrowband target cell belongs, and acquiring information of a traffic channel of the current call in the narrowband target cell;

The acquiring, by the terminal, the information about the service channel includes:

Obtaining, by the broadband cluster base station, information about a service channel of the current call from the broadband core network; and/or,

And obtaining, by the terminal, the information of the traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband serving cell, where the information of the traffic channel of the current call is sent by the broadband core network to the narrowband cluster base station.
The method according to claim 2 or 3, wherein the requesting the core network device to allocate a traffic channel to the narrowband target cell for the current call comprises:

Determining, by the terminal, whether the current call is a group call and the group belongs to a broadband core network;

If the current call is a group call and the group belongs to the broadband core network, the terminal sends a call setup request to the narrowband core network to which the narrowband target cell belongs by using the narrowband cluster base station corresponding to the narrowband target cell, where the call setup is performed. Requesting, by the group identifier of the group call, the narrowband core network to which the narrowband target cell belongs to send the call setup request to the group home broadband core network, and acquiring the current call in the narrowband target cell Information of the traffic channel;

The acquiring, by the terminal, the information about the service channel includes:

The terminal acquires information about a service channel of the current call from a narrowband cluster base station corresponding to the narrowband target cell.
The method according to claim 2 or 3, wherein the requesting the core network device to allocate a traffic channel to the narrowband target cell for the current call comprises:

Determining, by the terminal, whether the current call is a group call and the group belongs to a narrowband core network;

If the current call is a group call and the group belongs to the narrowband core network, the terminal sends a call setup request to the narrowband core network to which the narrowband target cell belongs by using the narrowband cluster base station corresponding to the narrowband target cell, where the call is established. The request includes the group identifier of the group call, so that the narrowband core network to which the narrowband target cell belongs sends the call setup request to the group home narrowband core network, and acquires the current call in the narrowband target cell. Information of the traffic channel;

The acquiring, by the terminal, the information about the service channel includes:

The terminal acquires information about a service channel of the current call from a narrowband cluster base station corresponding to the narrowband target cell.
The method according to claim 2 or 3, wherein the terminal requests a core network The device assigning a traffic channel to the narrowband target cell for the current call includes:

The terminal sends a cell handover request to the unified converged core network by using the broadband cluster base station, where the cell handover request includes the call identifier of the current call and the radio location identification number LAI of the narrowband target cell, so that the unified convergence The core network allocates a traffic channel to the narrowband target cell according to the LAI of the narrowband target cell and the call identifier for the current call;

The acquiring, by the terminal, the information about the service channel includes:

The terminal acquires information of the traffic channel from the broadband cluster base station, and the information of the traffic channel is sent by the unified converged core network to the broadband cluster base station;

and / or,

The terminal acquires information of the traffic channel from a narrowband cluster base station corresponding to the narrowband serving cell, and the information of the traffic channel is sent by the unified converged core network to the narrowband cluster base station.
The method according to claim 2 or 3, wherein the requesting the core network device to allocate a traffic channel to the narrowband target cell for the current call comprises:

Determining, by the terminal, whether the current call is a group call;

If the current call is a group call, the terminal sends a call setup request to the unified and fused core network by using the narrowband cluster base station corresponding to the narrowband target cell, where the call setup request includes the group identifier of the group call. So that the unified converged core network allocates a traffic channel in the narrowband target cell for the current call by incorporating the terminal into the group call according to the group identity;

The acquiring, by the terminal, the information about the service channel includes:

And acquiring, by the terminal, the information of the traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband target cell, where the traffic channel information is sent by the unified convergence core network to the narrowband cluster base station.
The method according to claim 1, wherein the acquiring, by the terminal, the information of the traffic channel of the current call in the narrowband target cell comprises:

Receiving, by the terminal, broadcast information sent by a narrowband core network to which the narrowband serving cell belongs, where the broadcast information includes information of a traffic channel of the narrowband target cell;

The terminal acquires a traffic channel list according to the broadcast information;

Determining, by the terminal, information about a service channel of the current call in the service channel list;

And if the information of the traffic channel of the current call exists in the service channel list, the terminal acquires information about a service channel of the current call in the narrowband target cell from a narrowband cluster base station corresponding to the narrowband serving cell.
A terminal, comprising:

a calling module, configured to participate in a current call in a broadband serving cell, where the terminal is registered in both the broadband serving cell and the narrowband serving cell;

An acquiring module, configured to acquire information about a service channel of a current call in a narrowband target cell;

And a processing module, configured to switch from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel acquired by the acquiring module.
The terminal according to claim 10, wherein the obtaining module comprises:

a requesting unit, configured to request the core network device to allocate a traffic channel to the narrowband target cell for the current call;

The first acquiring unit is configured to acquire information about the traffic channel.
The terminal according to claim 11, wherein the obtaining module further comprises:

a first receiving unit, configured to receive broadcast information sent by a narrowband core network to which the narrowband serving cell belongs, where the broadcast information includes information of a traffic channel of the narrowband target cell;

a second acquiring unit, configured to acquire a traffic channel list according to the broadcast information received by the receiving unit;

a first determining unit, configured to determine whether the information of the service channel of the current call exists in the service channel list;

And a triggering unit, configured to: if the information of the traffic channel of the current call does not exist in the traffic channel list, trigger the requesting core network to allocate a traffic channel to the narrowband target cell for the current call.
The terminal according to claim 11 or 12, wherein the request unit comprises:

a first processing subunit, configured to send a cell handover request to the broadband core network by using the broadband cluster base station, where the cell handover request includes a call identifier of the current call and a radio location identification number LAI of the narrowband target cell, so that The broadband core network may identify the narrowband core network to which the narrowband target cell belongs according to the LAI of the narrowband target cell, and acquire information about the current channel of the current call in the narrowband target cell;

The first obtaining unit includes:

a first acquiring subunit, configured to acquire information about a service channel of the current call from the broadband core network by using the broadband cluster base station;

and / or,

Acquiring information of the traffic channel of the current call from the narrowband cluster base station corresponding to the narrowband serving cell, where information of the traffic channel of the current call is sent by the broadband core to the narrowband cluster base station.
The terminal according to claim 11 or 12, wherein the request unit comprises:

a second processing sub-unit, configured to determine whether the current call is a group call and the group belongs to a broadband core network;

a first sending subunit, configured to send, by the narrowband cluster base station corresponding to the narrowband target cell, a call setup request to a narrowband core network to which the narrowband target cell belongs if the current call is a group call and the group belongs to the broadband core network. The call setup request includes the group identifier of the group call, so that the narrowband core network to which the narrowband target cell belongs sends the call setup request to the group home broadband core network, and acquires the narrowband target cell. Information of the traffic channel of the current call;

The first obtaining unit includes:

And a second acquiring subunit, configured to acquire information about a traffic channel of the current call from a narrowband cluster base station corresponding to the narrowband target cell.
The terminal according to claim 11 or 12, wherein the request unit comprises:

a third processing sub-unit, configured to determine whether the current call is a group call and the group belongs to a narrowband core network;

a second sending subunit, configured to send a call setup request to the narrowband core network to which the narrowband target cell belongs by using the narrowband cluster base station corresponding to the narrowband target cell if the current call is a group call and the group belongs to the narrowband core network. And the call setup request includes the group identifier of the group call, so that the narrowband core network to which the narrowband target cell belongs is merged into the group call according to the group identifier, and the narrowband target is acquired. Information of the traffic channel of the current call in the cell;

The first obtaining unit includes:

And a third acquiring subunit, configured to acquire information about the service channel of the current call from the narrowband cluster base station corresponding to the narrowband target cell.
The terminal according to claim 11 or 12, wherein the request unit comprises:

a fourth processing subunit, configured to send a cell handover request to the unified converged core network by using a broadband cluster base station, where the cell handover request includes a call identifier of the current call and a radio location identification number LAI of the narrowband target cell So that the unified converged core network allocates a traffic channel to the narrowband target cell according to the LAI of the narrowband target cell and the call identifier for the current call;

The first obtaining unit includes:

a fourth acquiring subunit, configured to acquire information of the traffic channel from the broadband cluster base station, where the information of the traffic channel is sent by the unified converged core network to the broadband cluster base station;

and / or,

Acquiring information of the traffic channel from a narrowband cluster base station corresponding to the narrowband serving cell, where the information of the traffic channel is sent by the unified converged core network to the narrowband cluster base station.
The terminal according to claim 11 or 12, wherein the request unit comprises:

a fifth processing subunit, configured to determine whether the current call is a group call;

a third sending subunit, configured to send, by the narrowband cluster base station corresponding to the narrowband target cell, a call setup request to the unified converged core network, where the current call is a group call, where the call setup request includes the group And the group identity of the call, such that the unified converged core network allocates a traffic channel in the narrowband target cell for the current call by incorporating the terminal into the group call according to the group identity;

The first obtaining unit includes:

a fifth obtaining subunit, configured to acquire information of a traffic channel of the current call from a narrowband cluster base station corresponding to the narrowband target cell, where information of a traffic channel of the current call is sent by the unified converged core network Narrowband cluster base station.
A cell switching method, comprising:

The request of the core network device receiving terminal allocates a traffic channel to the narrowband target cell for the current call, the terminal participates in the current call in the broadband serving cell, and the terminal registers in both the broadband serving cell and the narrowband serving cell;

The core network device sends information of the traffic channel to the terminal, so that the terminal switches from the broadband serving cell to the narrowband target cell to continue the current call according to information of the traffic channel.
The method of claim 18, wherein the core network device is the broadband When the serving cell belongs to the broadband core network, the request of the core network device to receive the terminal for the current call to allocate the traffic channel in the narrowband target cell includes:

The broadband core network receives a cell handover request sent by the terminal through a broadband cluster base station, where the cell handover request includes a call identifier of the current call and a wireless location identification number LAI of the narrowband target cell;

Identifying, by the broadband core network, a narrowband core network to which the narrowband target cell belongs according to the LAI;

Transmitting, by the broadband core network, a cell handover preparation request to the narrowband core network, where the cell handover preparation request includes the call identifier, so that the narrowband core network allocates a traffic channel to the current call according to the call identifier;

The broadband core network obtains information of the traffic channel from the narrowband core network through a gateway;

The sending, by the core network device, the information about the service channel to the terminal includes:

Transmitting, by the broadband core network, information of the traffic channel to the terminal;

and / or,

The broadband core network sends the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the information of the traffic channel to the terminal.
The method according to claim 18, wherein when the core network device is a unified converged core network, the request of the core network device to receive the terminal for the current call to allocate the traffic channel in the narrowband target cell includes:

Receiving, by the unified converged core network, a cell handover request sent by the terminal, where the cell handover request includes a call identifier of the current call and a radio location identification number LAI of the narrowband target cell;

The unified converged core network allocates a traffic channel to the narrowband target cell according to the call identifier for the current call;

The sending, by the core network device, the service channel information to the terminal includes:

The unified converged core network sends the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the information of the traffic channel to the terminal.
The method according to claim 18, wherein when the core network device is a narrowband core network to which the narrowband target cell belongs, the core network device receives the request of the terminal as the current call in the narrowband The target cell allocation traffic channel includes:

When the terminal determines that the current call is a group call and the group belongs to a narrowband core network, the narrowband core network to which the narrowband target cell belongs receives a call setup request sent by the terminal, where the call setup request includes the group call Call identity

Transmitting, by the narrowband core network to which the narrowband target cell belongs, the call setup request to the group home narrowband core network, so that the group home narrowband core network merges the terminal into the group call according to the call identifier Allocating a traffic channel to the narrowband target cell for the current call;

Receiving, by the narrowband core network to which the narrowband target cell belongs, the information of the traffic channel fed back by the group to the narrowband core network;

The sending, by the core network device, the service channel information to the terminal includes:

The narrowband core network to which the narrowband target cell belongs sends the information of the traffic channel to the terminal.
The method according to claim 18, wherein when the core network device is a narrowband core network to which the narrowband target cell belongs, the request of the core network device receiving the terminal to allocate a traffic channel to the narrowband target cell for the current call includes:

When the terminal determines that the current call is a group call and the group belongs to the broadband core network, the narrowband core network to which the narrowband target cell belongs receives a call setup request sent by the terminal, where the call setup request includes the group call Call identity

Sending, by the narrowband core network to which the narrowband target cell belongs, the call setup request to the group home broadband core network, so that the group home broadband core network merges the terminal into the group call according to the call identifier Allocating a traffic channel to the narrowband target cell for the current call;

Receiving, by the narrowband core network to which the narrowband target cell belongs, information of the traffic channel fed back by the group home broadband core network;

The sending, by the core network device, the service channel information to the terminal includes:

The narrowband core network to which the narrowband target cell belongs sends the information of the traffic channel to the terminal.
The method according to claim 18, wherein when the core network device is the unified converged core network, the request of the core network device receiving the terminal to allocate the traffic channel to the narrowband target cell for the current call comprises:

When the terminal determines that the current call is a group call, the unified convergence core network receives a call setup request sent by the terminal, where the call setup request includes a call identifier of the group call;

The unified converged core network allocates a traffic channel in the narrowband target cell for the current call by combining the terminal into the group call according to the call identity of the group call;

The sending, by the core network device, the service channel information to the terminal includes:

The unified converged core network sends information of the traffic channel to the terminal.
A core network device, comprising:

An allocating module, configured to receive, by the terminal, a service channel for the current call in the narrowband target cell, where the terminal participates in the current call in the broadband serving cell, where the terminal is registered in the broadband serving cell and the narrowband serving cell;

And a sending module, configured to send information about the traffic channel to the terminal, so that the terminal switches from the broadband serving cell to the narrowband target cell to continue the current call according to information of the traffic channel.
The core network according to claim 24, wherein when the core network device is a broadband core network to which the broadband serving cell belongs, the allocation module includes:

a first receiving unit, configured to send, by the terminal, a cell handover request sent by the broadband cluster base station, where the cell handover request includes a call identifier of the current call and a wireless location identifier of the narrowband target cell in the cell handover request No. LAI;

An identifying unit, configured to identify, according to the LAI, a narrowband core network to which the narrowband target cell belongs;

a first sending unit, configured to send a cell handover preparation request to the narrowband core network, where the cell handover preparation request includes the call identifier, so that the narrowband core network allocates a service to the current call according to the call identifier channel;

a first acquiring unit, configured to acquire, by using a gateway, information about the traffic channel from the narrowband core network;

The sending module includes:

a second sending unit, configured to send information about the traffic channel to the terminal;

and / or,

Transmitting the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the service channel letter to the terminal interest.
The core network according to claim 24, wherein when the core network device is a unified core network, the allocation module includes:

a second receiving unit, configured to receive a cell handover request sent by the terminal, where the cell handover request includes a call identifier of the current call and a wireless location identification number LAI of the narrowband target cell;

a processing unit, configured to allocate a traffic channel to the narrowband target cell according to the call identifier according to the current call;

The sending module includes:

a third sending unit, configured to send the information of the traffic channel to the narrowband core network to which the narrowband serving cell belongs, so that the narrowband cluster base station corresponding to the narrowband serving cell sends the information of the traffic channel to the terminal .
The core network according to claim 24, wherein when the core network device is a narrowband core network to which the narrowband target cell belongs, the allocation module includes:

a third receiving unit, configured to: when the terminal determines that the current call is a group call and the group belongs to a narrowband core network, receive a call setup request sent by the terminal, where the call setup request includes a call identifier of the group call ;

a fourth sending unit, configured to send the call setup request to the group-owned narrowband core network, so that the group-owned narrowband core network according to the call identifier is configured by incorporating the terminal into the group call The current call allocates a traffic channel in the narrowband target cell;

a fourth receiving unit, configured to receive information about the traffic channel fed back by the group-owned narrowband core network;

The sending module includes:

And a fifth sending unit, configured to send information about the traffic channel to the terminal.
The core network according to claim 24, wherein when the core network device is a narrowband core network to which the narrowband target cell belongs, the allocation module includes:

a fifth receiving unit, configured to: when the terminal determines that the current call is a group call and the group belongs to the broadband core network, receive a call setup request sent by the terminal, where the call setup request includes the call identifier of the group call ;

a sixth sending unit, configured to send the call setup request to the group home broadband core network, to And causing the group home broadband network to allocate a traffic channel in the narrowband target cell for the current call by combining the terminal into the group call according to the call identifier; and a sixth receiving unit, configured to receive the group Information of the traffic channel fed back to the broadband core network;

The sending module includes:

And a seventh sending unit, configured to send information about the traffic channel to the terminal.
The core network according to claim 24, wherein when the core network device is the unified and integrated core network, the allocation module comprises:

a seventh receiving unit, configured to receive a call setup request sent by the terminal, where the call setup request includes a call identifier of the group call;

An allocating unit, configured to allocate a traffic channel to the narrowband target cell for the current call by combining the terminal into the group call according to the call identity of the group call; the sending module includes:

And an eighth sending unit, configured to send information about the traffic channel to the terminal.
A terminal, comprising:

Transceiver, processor and bus;

The transceiver and the processor are connected by the bus;

The processor has the following functions: participating in a current call in a broadband serving cell, where the terminal is registered in both the broadband serving cell and the narrowband serving cell;

The transceiver has the function of: acquiring information of a traffic channel of a current call in a narrowband target cell;

The processor has a function of: switching from the broadband serving cell to the narrowband target cell to continue the current call according to the information of the traffic channel acquired by the acquiring module.
A core network device, comprising:

Transceiver, processor and bus;

The transceiver and the processor are connected by the bus;

The processor has the following functions: the request of the receiving terminal allocates a traffic channel to the narrowband target cell for the current call, the terminal participates in the current call in the broadband serving cell, and the terminal is in the broadband serving cell and the narrowband serving cell Registered;

The transceiver has a function of: transmitting the traffic channel information acquired by the processing module to the terminal, so that the terminal is small from the broadband service according to information of the traffic channel. The zone switches to the narrowband target cell to continue the current call.