CN105872999B

CN105872999B - Cell switching method, terminal and core network equipment

Info

Publication number: CN105872999B
Application number: CN201610370440.5A
Authority: CN
Inventors: 陈宏�; 尧俊峰
Original assignee: Hytera Communications Corp Ltd
Current assignee: Hytera Communications Corp Ltd
Priority date: 2016-05-27
Filing date: 2016-05-27
Publication date: 2020-02-28
Anticipated expiration: 2036-05-27
Also published as: CN105872999A

Abstract

The embodiment of the invention discloses a cell switching method and a terminal, which are used for realizing switching from a narrow-band cell to a wide-band cell and avoiding call drop. The method provided by the embodiment of the invention comprises the following steps: a terminal participates in the current call in a narrow-band service cell, and the terminal is registered in both a broadband service cell and the narrow-band service cell; the terminal acquires the information of the wireless resource of the current call in the broadband service cell; the terminal switches from the narrow-band service cell to the wide-band service cell according to the information of the wireless resource and continues the current call by using the wireless resource.

Description

Cell switching method, terminal and core network equipment

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a cell switching method, a terminal and core network equipment.

Background

In the field of professional Trunking communications, Police Digital Trunking (PDT) systems, Terrestrial Trunked Radio (Tetra) systems, and P25(Project25) are mainstream systems, and all belong to narrowband Trunking systems. PDT, Tetra, P25 and other narrow-band trunking communication systems can provide good narrow-band voice services for users, but have the disadvantage of low transmission rate in terms of data services, and cannot meet the increasing requirements of broadband services such as images and data, and to solve this problem, the industry generally looks good at a narrow-band and narrow-band trunking fusion method of a narrow-band system, where the narrow-band system is, for example, a Long Term Evolution (LTE) system, and the narrow-band and narrow-band trunking fusion method is, for example: PDT + LTE, Tetra + LTE, P25+ LTE, etc.

In the initial stage of the convergence, the core networks are respectively constructed and interconnected through the gateways, the network architecture of the gateway interconnection may be as shown in fig. 1, and then the core networks gradually transition to the unified convergence stage, and the unified convergence network architecture may be as shown in fig. 2. The terminal types supported by the broadband and narrowband trunking system include a narrowband terminal, a broadband terminal and a dual-mode terminal.

Existing broadband cluster and narrowband cluster standards both support handover functions: for the broadband trunking terminal, a switching scheme (e.g. LTE switching) defined by the broadband standard can be adopted; for the narrow-band cluster terminal, a switching scheme (for example, PDT handover) defined by the narrow-band cluster standard can be adopted; for a dual-mode terminal, a broadband switching scheme can be adopted for switching from a broadband cell to a broadband cell, and a narrowband switching scheme can be adopted for switching from a narrowband cell to a narrowband cell. And the existing standard and technical specification are not involved in switching from the narrowband cell to the broadband cell.

Disclosure of Invention

In view of this, embodiments of the present invention provide a cell handover method and a terminal, which can implement handover from a broadband cell to a narrowband cell and avoid call drop.

In a first aspect, an embodiment of the present invention provides a cell handover method, including: a terminal participates in the current call in a narrow-band service cell, and the terminal is registered in both a broadband service cell and the narrow-band service cell; the terminal acquires the information of the wireless resource of the current call in the broadband service cell; the terminal switches from the narrow-band service cell to the wide-band service cell according to the information of the wireless resource and continues the current call by using the wireless resource.

With reference to the first aspect of the embodiment of the present invention, in a first implementation manner of the first aspect of the embodiment of the present invention, the obtaining, by the terminal, information of the radio resource of the current call existing in the broadband serving cell specifically includes: the terminal requests the core network device to allocate radio resources in the broadband service cell for the current call; and the terminal receives the information of the wireless resource sent by the broadband cluster base station corresponding to the broadband service cell.

With reference to the first implementation manner of the first aspect of the embodiment of the present invention, in a second implementation manner of the first aspect of the embodiment of the present invention, after a terminal participates in a current call in a narrowband serving cell, before the terminal requests a core network device to allocate radio resources for the current call in the broadband serving cell, the method further includes:

the terminal judges whether the current call is a group call, if so, the terminal receives the broadcast information sent by the broadband service cell;

the terminal judges whether the terminal participates in the group calling according to the broadcast information, if not, the terminal is triggered to request the core network equipment to allocate wireless resources for the current calling in the broadband service cell.

With reference to the first implementation manner or the second implementation manner of the first aspect of the embodiment of the present invention, in a third implementation manner of the first aspect of the embodiment of the present invention, the requesting, by the terminal, the core network device to allocate a radio resource to the broadband serving 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 a number of the terminal, a Session Description Protocol (SDP) of the terminal, a radio Location Identity (LAI) of the narrowband serving cell, and a service channel number of the narrowband serving cell, so that the broadband core network sends a third cell handover preparation request to the narrowband core network to which the narrowband serving cell belongs, where the third cell handover preparation request includes the number, the SDP, the LAI, and the service channel number, and indicates that the broadband cluster base station allocates radio resources for the current call according to the number, the SDP, and the call context are allocated by the broadband core network according to the call Identity (Identity, for short: ID) is queried, and the call ID is queried by the narrowband core network according to the LAI and the service channel number.

With reference to the first implementation manner or the second implementation manner of the first aspect of the embodiment of the present invention, in a fourth implementation manner of the first aspect of the embodiment of the present invention, the requesting, by the terminal, the core network device to allocate a radio resource to the broadband serving cell for the current call includes:

the terminal sends a cell switching request to a narrowband core network to which the narrowband service cell belongs through a narrowband cluster base station corresponding to the narrowband service cell, wherein the cell switching request carries a number of the terminal and an SDP of the terminal, so that the narrowband core network sends a fourth cell switching preparation request to the broadband core network, the fourth cell switching preparation request carries the number, the SDP and a call ID of the current call, the call ID is used for the broadband core network to inquire a call context of the current call, and the SDP and the call context are used for the broadband core network to indicate the broadband cluster base station to allocate wireless resources for the current call.

With reference to the first implementation manner or the second implementation manner of the first aspect of the embodiment of the present invention, in a fifth implementation manner of the first aspect of the embodiment of the present invention, the requesting, by the terminal, the core network device to allocate a radio resource to the broadband serving cell for the current call includes:

the terminal sends a cell switching request to a broadband core network to which the broadband service cell belongs through a broadband cluster base station corresponding to the broadband service cell, so that the broadband core network sends a fifth cell handover preparation request to the narrowband core network to which the narrowband serving cell belongs, the fifth cell handover preparation request includes the number of the terminal, the SDP of the terminal, the LAI of the narrowband serving cell, and the traffic channel number of the narrowband serving cell, and instructs the broadband cluster base station to perform handover according to the traffic channel number included in the first cell handover preparation request, the SDP and the call context allocate radio resources for the current call, the call context is queried and sent by a group-owned narrowband core network to the broadband core network based on a call ID, and the call ID is inquired and sent to the narrowband core network to which the group belongs by the narrowband core network to which the narrowband service cell belongs according to the LAI and the service channel number.

With reference to the first implementation manner or the second implementation manner of the first aspect of the embodiment of the present invention, in a sixth implementation manner of the first aspect of the embodiment of the present invention, the requesting, by the terminal, the core network device to allocate a radio resource to the broadband serving cell for the current call includes:

the terminal sends a cell switching request to a narrowband core network to which the narrowband service cell belongs through a narrowband cluster base station to which the narrowband service cell belongs, wherein the cell switching request comprises a number of the terminal and an SDP (service data center) of the terminal, so that the narrowband core network to which the narrowband service cell belongs inquires a call ID (identity) of the current call and sends the call ID to a group-attributive narrowband core network, the call ID is used for the group-attributive narrowband core network to inquire a call context of the current call, the number and the call context are used for the broadband core network to indicate the broadband cluster base station to allocate wireless resources for the current call.

With reference to the first implementation manner of the first aspect of the embodiment of the present invention, in a seventh implementation manner of the first aspect of the embodiment of the present invention, the requesting, by the terminal, the core network device to allocate a radio resource in the broadband serving cell for the current call includes:

the terminal judges whether the current call is a single call;

if the current call is a single call, the terminal sends a cell switching request to a broadband core network to which the broadband service cell belongs through a broadband cluster base station corresponding to the broadband service cell, so that the broadband core network sends a first cell switching preparation request to a narrowband core network to which the narrowband service cell belongs, the first cell switching preparation request comprises the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell, the broadband cluster base station is indicated to allocate wireless resources for the current call according to the number, the SDP and a call context, and the call context is inquired and sent to the broadband core network by the narrowband core network according to the LAI and the service channel number.

With reference to the first implementation manner of the first aspect of the embodiment of the present invention, in an eighth implementation manner of the first aspect of the embodiment of the present invention, the requesting, by the terminal, the core network device to allocate a radio resource in the broadband serving cell for the current call includes:

the terminal judges whether the current call is a single call;

if the current call is a single call, the terminal sends a cell switching request to a narrowband core network to which the narrowband serving cell belongs through a narrowband cluster base station corresponding to the narrowband serving cell, so that the narrowband core network sends a second cell switching preparation request to the broadband core network, the second cell switching preparation request carries the number, the SDP and the call context of the current call, the call context information is obtained by querying the narrowband core network, and the number and the call context are used for the broadband core network to indicate the broadband cluster base station to allocate wireless resources for the current call.

With reference to the first implementation manner of the first aspect of the embodiment of the present invention, in a ninth implementation manner of the first aspect of the embodiment of the present invention, the requesting, by the terminal, the core network device to allocate a radio resource in the broadband serving cell for the current call includes:

the terminal sends a cell switching request to the unified converged core network through a broadband cluster base station corresponding to the broadband service cell, wherein the cell switching request comprises the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number, so that the unified converged core network inquires the call context of the current call according to the LAI and the service channel number and indicates the broadband cluster base station to allocate wireless resources for the current call according to the number, the SDP and the call context.

With reference to the first implementation manner of the first aspect of the embodiment of the present invention, in a tenth implementation manner of the first aspect of the embodiment of the present invention, the requesting, by the terminal, the core network device to allocate a radio resource in the broadband serving cell for the current call includes:

the terminal sends a cell switching request to the unified converged core network through the narrowband cluster base station corresponding to the narrowband service cell, wherein the cell switching request comprises the number of the terminal and the SDP of the terminal, so that the unified converged core network inquires the call context of the current call and indicates the broadband cluster base station to allocate wireless resources for the current call according to the number, the SDP and the call context.

With reference to the first aspect of the embodiment of the present invention, in an eleventh implementation manner of the first aspect of the embodiment of the present invention, the acquiring, by the terminal, the information of the radio resource of the current call in the broadband serving cell includes:

the terminal judges whether the terminal participates in the group call according to the broadcast information, if so, the terminal receives the information of the wireless resource of the current call sent by the broadband cluster base station corresponding to the broadband service cell.

In a second aspect, an embodiment of the present invention provides a terminal, where the terminal has a function of implementing the terminal in the foregoing method. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible implementation, the terminal includes:

a calling module, which is used for participating in the current calling in a narrow-band service cell, and the terminal is registered in both the broadband service cell and the narrow-band service cell;

an obtaining module, configured to obtain information of radio resources of the current call in which the calling module participates in the broadband serving cell;

and the processing module is used for switching the narrowband service cell to the broadband service cell according to the information of the wireless resource acquired by the acquisition module and continuing the current call by using the wireless resource.

In another possible implementation manner, the terminal includes:

a transceiver, a processor and a bus;

the transceiver and the processor are connected through the bus;

the transceiver is used for executing the following instructions:

the terminal participates in the current call in a narrow-band service cell, and the terminal is registered in both a wide-band service cell and the narrow-band service cell; acquiring information of wireless resources of the current call participated by the call module in the broadband service cell;

the processor is configured to execute the following instructions:

and switching from the narrowband service cell to the broadband service cell according to the information of the wireless resource acquired by the acquisition module and continuing the current call by using the wireless resource.

In a third aspect, an embodiment of the present invention provides a cell handover method, including: the method comprises the steps that core network equipment receives a request of a terminal to allocate wireless resources for a current call in a broadband service cell, the terminal participates in the current call in a narrowband service cell, and the terminal is registered in both the broadband service cell and the narrowband service cell; the core network device sends the information of the radio resource to the terminal, so that the terminal can switch from the narrowband serving cell to the broadband serving cell to continue the current call according to the information of the radio resource.

With reference to the third aspect of the present invention, in a first implementation manner of the third aspect of the present invention, when the core network device is a broadband core network to which the broadband serving cell belongs, the receiving, by the core network device, a request of a terminal to allocate a radio resource in the broadband serving cell for a current call includes:

the broadband core network receives a cell switching request sent by the terminal through the broadband cluster base station;

the broadband core network sends a first cell switching preparation request to a narrowband core network to which the narrowband service cell belongs, wherein the first cell switching preparation request comprises the number of the terminal, a Session Description Protocol (SDP) of the terminal, a wireless location identification (LAI) of the narrowband service cell and a service channel number of the narrowband service cell, so that the narrowband core network inquires the call context of the current call according to the LAI and the service channel number;

the broadband core network receives a second cell switching preparation request sent by the narrowband core network, wherein the second cell switching preparation request carries the number, the SDP and the call context;

the broadband core network instructs the broadband cluster base station to allocate radio resources for the current call based on the number, the SDP and the call context.

With reference to the third aspect of the present invention, in a second implementation manner of the third aspect of the present invention, when the core network device is a narrowband core network to which the narrowband serving cell belongs, the receiving, by the core network device, a request of a terminal to allocate a radio resource in the broadband serving cell for a current call includes:

the narrowband core network receives a cell switching request sent by the terminal through a narrowband cluster base station corresponding to the narrowband service cell;

the narrowband core network sends a third cell switching preparation request to the broadband core network, wherein the third cell switching preparation request carries the number of the terminal, the SDP of the terminal and the call context of the current call, and the call context information is obtained by the narrowband core network through inquiry, so that the broadband core network indicates the broadband cluster base station to allocate radio resources for the current call according to the number, the SDP and the call context.

With reference to the third aspect of the present invention, in a third implementation manner of the third aspect of the present invention, when the core network device is a unified converged core network, the receiving, by the core network device, a request of a terminal to allocate a radio resource in a broadband service cell for a current call includes:

the unified convergence core network receives a cell switching request sent by the terminal through a broadband cluster base station corresponding to the broadband service cell, wherein the cell switching request comprises the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the unified converged core network inquires the call context of the current call according to the LAI and the service channel number;

the unified converged core network instructs the broadband cluster base station to allocate radio resources for the current call based on the number, the SDP and the call context.

With reference to the third aspect of the present embodiment, in a fourth implementation manner of the third aspect of the present embodiment, when the core network device is a unified core network, the receiving, by the core network device, a request of a terminal to allocate a radio resource in a broadband service cell for a current call includes:

the unified fusion core network receives a cell switching request sent by the terminal through a narrow-band cluster base station corresponding to the narrow-band service cell, wherein the cell switching request comprises the number of the terminal and the SDP of the terminal;

the unified converged core network inquires the call context of the current call;

With reference to the third aspect of the present invention, in a fifth implementation manner of the third aspect of the present invention, when the core network device is a broadband core network to which the broadband serving cell belongs, the receiving, by the core network device, a request of a terminal to allocate a radio resource in the broadband serving cell for a current call includes:

the broadband core network receives a cell switching request sent by the terminal through the broadband cluster base station, wherein the cell switching request comprises the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the broadband core network sends a fourth cell switching preparation request to the narrowband core network to which the narrowband service cell belongs, wherein the fourth cell switching preparation request comprises the number, the SDP, the LAI and the service channel number, so that the narrowband core network queries the call identity ID of the current call according to the LAI and the service channel number;

the broadband core network receives a fifth cell switching preparation request sent by the narrowband core network, wherein the fifth cell switching preparation request carries the number, the SDP and the call ID;

the broadband core network inquires the call context of the current call according to the call ID;

With reference to the third aspect of the present invention, in a sixth implementation manner of the third aspect of the present invention, when the core network device is a narrowband core network to which the narrowband serving cell belongs, the receiving, by the core network device, a request of a terminal to allocate a radio resource in the broadband serving cell for a current call includes:

the narrowband core network receives a cell switching request sent by the terminal through a narrowband cluster base station corresponding to the narrowband service cell, wherein the cell switching request carries the number of the terminal and the SDP of the terminal;

the narrowband core network sends a sixth cell switching preparation request to a broadband core network to which the broadband service cell belongs, wherein the sixth cell switching preparation request carries the number, the SDP and the call identity ID of the current call, so that the broadband core network indicates the broadband cluster base station to allocate wireless resources for the current call according to the number, the SDP and the call context, and the call context is obtained by the broadband core network inquiring the current call according to the call ID.

With reference to the third aspect of the present invention, in a seventh implementation manner of the third aspect of the present invention, when the core network device is a broadband core network to which the broadband serving cell belongs, the receiving, by the core network device, a request of a terminal to allocate a radio resource in the broadband serving cell for a current call includes:

the broadband core network receives a cell switching request sent by the terminal through a broadband cluster base station corresponding to the broadband service cell;

the broadband core network sends a seventh cell switching preparation request to a narrowband core network to which the narrowband serving cell belongs, wherein the seventh cell switching preparation request comprises the number of the terminal, the SDP of the terminal, the LAI of the narrowband serving cell and the service channel number of the narrowband serving cell, so that the narrowband core network to which the narrowband serving cell belongs sends an eighth cell switching preparation request to a group-attributive narrowband core network, the eighth cell switching preparation request comprises the number, the SDP and a call ID, and the call ID is obtained by the narrowband core network to which the narrowband serving cell belongs according to the LAI and the service channel number;

the broadband core network receives a ninth cell switching preparation request sent by the group of home narrowband core networks, wherein the ninth cell switching preparation request comprises the number, the SDP and a calling context, and the calling context is obtained by the group of home narrowband core networks according to the calling ID query;

With reference to the third aspect of the present invention, in an eighth implementation manner of the third aspect of the present invention, when the core network device is a narrowband core network to which the narrowband serving cell belongs, the receiving, by the core network device, a request of a terminal to allocate a radio resource in the broadband serving cell for a current call includes:

the narrowband core network to which the narrowband service cell belongs receives a cell switching request sent by the terminal through a narrowband cluster base station to which the narrowband service cell belongs, wherein the cell switching request comprises the number of the terminal and the SDP of the terminal;

the narrow band core network to which the narrow band service cell belongs inquires the call ID of the current call;

the narrowband core network to which the narrowband service cell belongs sends a tenth cell switching preparation request to a group-attributive narrowband core network, wherein the tenth cell switching preparation request carries the number of the terminal, the SDP of the terminal and the call ID, so that the group-attributive narrowband core network sends an eleventh cell switching preparation request to the broadband core network to which the broadband service cell belongs, the eleventh cell switching preparation request comprises the number, the SDP and the call context, the call context is obtained by the group-attributive narrowband core network according to the call ID, and the number, the SDP and the call context are used for the broadband core network to indicate the broadband cluster base station to allocate wireless resources for the current call.

In a fourth aspect, an embodiment of the present invention provides a core network device, where the core network device has a function of implementing the core network device in the foregoing method. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible implementation, the core network device includes:

the allocation module is used for receiving a request of a terminal to allocate wireless resources for a current call in a broadband service cell, the terminal participates in the current call in a narrowband service cell, and the terminal is registered in both the broadband service cell and the narrowband service cell;

a sending module, configured to send the information of the radio resource to the terminal, so that the terminal can switch from the narrowband serving cell to the broadband serving cell according to the information of the radio resource to continue the current call.

In another possible implementation manner, the core network device includes:

a transceiver, a processor and a bus;

the transceiver is connected with the processor through the bus;

the processor is configured to execute the following instructions: receiving a request of a terminal to allocate wireless resources for a current call in a broadband service cell, wherein the terminal participates in the current call in a narrowband service cell, and the terminal is registered in both the broadband service cell and the narrowband service cell;

the transceiver is used for executing the following instructions: and sending the information of the wireless resource acquired by the processing module to the terminal so that the terminal switches from the narrowband serving cell to the broadband serving cell to continue the current call according to the information of the wireless resource.

According to the technical scheme, the embodiment of the invention has the following advantages:

in the embodiment of the invention, the terminal participating in the current call in the narrow-band service cell can acquire the information of the wireless resource of the current call existing in the wide-band service cell, and can switch from the narrow-band service cell to the wide-band service cell according to the information of the wireless resource and utilize the wireless resource to continue the current call.

Drawings

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

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

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

fig. 3 is a flowchart illustrating a cell switching method according to an embodiment of the present invention;

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

fig. 5 is another signaling interaction diagram of the cell switching method according to the embodiment of the present invention;

fig. 6 is another signaling interaction diagram of the cell switching method according to the embodiment of the present invention;

fig. 7 is another signaling interaction diagram of the cell switching method according to the embodiment of the present invention;

fig. 8 is another signaling interaction diagram of the cell switching method according to the embodiment of the present invention;

fig. 9 is another signaling interaction diagram of the cell switching method according to the embodiment of the present invention;

fig. 10 is another signaling interaction diagram of the cell switching method according to the embodiment of the present invention;

fig. 11 is another signaling interaction diagram of the cell switching method according to the embodiment of the present invention;

fig. 12 is another schematic signaling interaction diagram of a cell handover method according to an embodiment of the present invention;

fig. 13 is another schematic signaling interaction diagram of a cell switching method according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of a core network device according to an embodiment of the present invention;

fig. 17 is another schematic structural diagram of a core network device according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention provides a cell switching method and a terminal, which are used for realizing switching from a broadband cell to a narrowband cell and avoiding call drop.

References in the specification and claims of this application and in the above-described drawings to "first," "second," "third," "fourth" (if any), etc. are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The cell switching method provided by the embodiment of the invention can be applied to a network architecture of gateway interconnection and can also be applied to a network architecture of unified fusion. The terminal mentioned in the embodiment of the invention is a dual-mode terminal which simultaneously supports a broadband system and a narrowband system, the terminal is in a dual-standby mode, namely the terminal is simultaneously registered in a broadband service cell and a narrowband service cell and is on the network, and the terminal participates in a call (single call or group call) through the narrowband service cell. The cell switching method provided by the embodiment of the invention ensures that the terminal can be switched from the narrow-band service cell to the broadband target cell, and the call is continuously kept, thereby avoiding call drop. The terminal mentioned in the embodiment of the invention can be an interphone or a mobile phone.

Referring to fig. 3, embodiments of the present invention provide a cell switching method, which includes:

301. the terminal participates in the current call in the narrow band service cell, and the terminal is registered in both the wide band service cell and the narrow band service cell.

The terminal initiates a current call in the narrowband service cell, and the terminal is a cluster dual-mode terminal. That is, the terminal may perform a call in the broadband serving cell or may perform a call in the narrowband serving cell.

302. The terminal acquires the information of the radio resource of the current call existing in the broadband service cell.

The terminal may simultaneously monitor the signal quality (e.g., measured according to the received signal strength indicator RSSI or the bit error rate BER) of the current serving cell (i.e., the narrowband serving cell) of the narrowband trunking system and the signal quality (e.g., measured according to the reference signal received power RSRP or the reference signal received quality RSRQ) of the current serving cell (i.e., the broadband serving cell) of the broadband trunking system, and determine whether the handover condition is currently satisfied by using a preset decision algorithm, for example, when the signal quality of the narrowband serving cell is lower than a first preset threshold and the signal quality of the broadband serving cell is higher than a second preset threshold, the handover condition is considered to be satisfied, and the second preset threshold is greater than or equal to the first preset threshold.

When determining that the handover condition is satisfied and determining that handover is required, the terminal needs to acquire information of radio resources of a current call existing in the broadband serving cell.

The radio resources of the current call existing in the broadband serving cell may be allocated before handover (for example, the current call is a group call, and the current call itself already participates in the broadband serving cell); or the wireless resource of the current call existing in the broadband service cell is allocated in real time during handover (for example, when the broadband service does not participate in the current group call or the current call is a single call, the broadband core network to which the broadband service cell belongs controls the broadband cluster base station corresponding to the broadband service cell after receiving the request of the terminal, and allocates the wireless resource for the current call in real time in the broadband service cell).

The information of the Radio Resource of the current call existing in the broadband serving cell may include Radio Resource Control (RRC) configuration parameters (including Radio Link Control (RLC) parameters, Media Access Control (MAC) parameters, and physical layer parameters), UE measurement information, and the like.

303. The terminal switches from the narrow-band service cell to the wide-band service cell according to the information of the wireless resource and continues the current call by using the wireless resource.

And after acquiring the information of the wireless resource, the terminal switches from the narrowband serving cell to the broadband serving cell.

As can be understood from the above description of the method, in step 302, if the radio resource of the current call existing in the broadband serving cell is allocated before handover and the broadband serving cell is already participating in the current group call, the method for the terminal to acquire the information of the radio resource is as follows: the terminal directly obtains the information of the wireless resource from the information broadcasted by the air interface of the broadband service cell.

The following embodiments describe in detail the method for acquiring information of a radio resource by a terminal when the radio resource of a current call in a broadband serving cell is allocated in real time during handover. Fig. 4 to 9 correspond to a network structure of gateway interconnection, and fig. 10 to 13 correspond to a unified network architecture.

Referring to fig. 4, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is switched, the broadband cluster base station is controlled by a broadband core network to which the broadband serving cell belongs, the current call is a group call, the group call belongs to a narrowband core network, the terminal is currently located in the narrowband serving cell, and wants to switch to the broadband serving cell to continue the current call, and the terminal initiates a switching request by the narrowband serving cell, which includes:

after determining that cell HANDOVER is needed, a terminal initiates a cell HANDOVER request P _ HANDOVER to a narrowband core network through the narrowband trunking base station, wherein the P _ HANDOVER carries a user number of the terminal and a relevant parameter of a Session Description Protocol (SDP);

the narrowband core network to which the narrowband service cell belongs inquires the call identity Identifier (ID) of the current call according to the service channel of the terminal, and sends a cell switching preparation request to a group-homed narrowband core network, and the group-homed narrowband core network inquires the call context (such as the information of the calling number 15708971878, the called group number 18908157150, the call type, the call attribute and the like) of the current call according to the call ID;

the group home narrowband core network sends a cell switch preparation request PSIPPREPARE to the broadband core network through the gateway, where the PSIP PREPARE carries the number, the SDP, and the call context (information such as the calling number, called group number, call type, call attribute, etc.);

the gateway converts the PSIP PREPARE into sip (refer) signaling to send to the broadband core network, where the sip (refer) signaling carries the SDP, the number, and the call context (information such as the calling number, called group number, call type, call attribute, etc.);

the broadband core network will instruct the broadband cluster base station controlled by the broadband core network to allocate radio resources for the current call according to the number, the SDP and the call context;

the broadband core network sends a feedback message SIP 200OK signaling to the gateway;

the gateway converts the SIP 200OK signaling into a feedback message PSIP 200OK signaling and sends the feedback message PSIP 200OK signaling to the group home narrow band core network, and the group home narrow band core network sends the PSIP 200OK signaling to the narrow band core network to which the narrow band service cell belongs;

the terminal receives a Group Call Config message (the message carries an NAS message Group _ Call _ SETUP INDICATION sent by the broadband core network) broadcasted by the broadband cluster base station, and acquires the information of the wireless resources allocated by the broadband cluster base station for the current Call;

the terminal switches from the narrow-band service cell to the wide-band service cell according to the information of the wireless resource, and continues the current call by using the wireless resource to receive and transmit data.

Referring to fig. 5, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by a broadband core network to which the broadband serving cell belongs; the current call is a group call, and the group belongs to a broadband core network; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the narrow band service cell, and the specific method comprises the following steps:

the narrowband core network inquires the call identity ID of the current call according to the service channel where the terminal is located;

the narrowband core network sends a cell switching preparation request PSIP PREPARE to a broadband core network through a gateway, wherein PSIP PREPARE carries the call ID, the number of the terminal and the SDP of the terminal;

the gateway converts the PSIP PREPARE into an sip (refer) signaling to send to the broadband core network, wherein the sip (refer) signaling carries the call ID, the number of the terminal and the SDP of the terminal;

the broadband core network feeds back SIP 200OK signaling to the gateway;

the gateway converts the SIP 200OK signaling into a PSIP 200OK signaling and sends the PSIP 200OK signaling to the narrowband core network;

Referring to fig. 6, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by a broadband core network to which the broadband serving cell belongs; the current call is a group call, and the group belongs to a broadband core network; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the broadband service cell, and the specific method comprises the following steps:

after determining that cell switching is needed, a terminal broadcasts a cell switching REQUEST trunk HANDOVER REQUEST to a broadband core network through a broadband cluster base station, wherein the cell switching REQUEST trunk HANDOVER REQUEST carries the number of the terminal, the SDP of the terminal, the LAI of a narrowband service cell and the service channel number of the narrowband service cell;

the broadband core network sends a cell switching preparation request SIP REFER to the narrowband core network through a gateway, wherein the SIP REFER carries the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the gateway converts the SIP REFER into PSIP PREPARE signaling to be sent to the narrowband core network, where the signaling carries the number of the terminal, the SDP parameter of the terminal, the LAI of the narrowband serving cell, and the service channel number of the narrowband serving cell;

the narrowband core network inquires the call ID of the current call according to the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the narrowband core network sends a cell switching preparation request PSIP PREPARE to the broadband core network through the gateway, wherein the PSIP PREPARE carries the number of the terminal, the SDP of the terminal and the call ID;

the broadband core network inquires the context of the current call (the information such as the calling number, the called group number, the call type, the call attribute and the like) according to the call ID;

Referring to fig. 7, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by a broadband core network to which the broadband serving cell belongs; the current call is a group call, and the group belongs to a narrow-band core network; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the broadband service cell, and the specific method comprises the following steps:

after determining that cell switching is needed, the terminal broadcasts a TRUNK HANDANOVER REQUEST to a broadband core network through a broadband cluster base station, and the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell are carried;

the broadband core network sends a cell switching preparation request SIP REFER to a narrowband core network to which the narrowband service cell belongs through a gateway, wherein the SIP REFER carries the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the gateway converts the SIP REFER into PSIP PREPARE signaling to be sent to the narrowband core network to which the narrowband serving cell belongs, where the signaling carries the number of the terminal, the SDP of the terminal, the LAI of the narrowband serving cell, and the service channel number of the narrowband serving cell;

the narrowband core network to which the narrowband service cell belongs inquires the call ID of the current call according to the LAI of the narrowband service cell and the service channel number of the narrowband service cell, and sends the call ID to the group-attributive narrowband core network;

the group home narrowband core network inquires the context of the current call (the information of the calling number, the called group number, the call type, the call attribute and the like) according to the call ID;

the group home narrowband core network sends a cell switch preparation request PSIPPREPARE to the broadband core network through a gateway, wherein the PSIP PREPARE carries the number of the terminal, the SDP of the terminal, and the call context (information such as the calling number, the called group number, the call type, and the call attribute);

the gateway converts the PSIP PREPARE into sip (refer) signaling to send to the broadband core network, where the sip (refer) signaling carries the number of the terminal, the SDP of the terminal, and the call context (information such as the calling number, called group number, call type, and call attribute);

the broadband core network will instruct the broadband cluster base station controlled by the broadband core network to allocate wireless resources for the current call according to the number of the terminal, the SDP of the terminal and the call context;

the broadband core network feeds back SIP 200OK signaling to the gateway;

the gateway converts the SIP 200OK signaling into a PSIP 200OK signaling and sends the PSIP 200OK signaling to the group home narrowband core network, and the group home narrowband core network sends the PSIP 200OK signaling to the narrowband core network to which the narrowband service cell belongs;

Referring to fig. 8, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by a broadband core network to which the broadband serving cell belongs; the current call is a single call; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the broadband service cell, and the specific method comprises the following steps:

the gateway converts the SIP REFER into PSIP PREPARE signaling to be sent to the narrowband core network, the signaling carries the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the narrowband core network inquires the context (the information such as the calling number, the called group number, the calling type, the calling attribute and the like) of the current call according to the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the narrowband core network sends a cell switching preparation request PSIP PREPARE to a broadband core network through a gateway, wherein the PSIP PREPARE carries the number of the terminal, the SDP of the terminal, and the call context (information such as the calling number, the called group number, the call type, and the call attribute);

the terminal receives an RRC Connection reconfiguration message RRC Connection reconfiguration sent by the broadband cluster base station, and acquires the information of the radio resources allocated to the current call by the broadband cluster base station;

the terminal sends RRC Connection reconfiguration complete message RRC Connection reconfiguration complete to the broadband cluster base station, switches from the narrowband service cell to the broadband service cell according to the information of the wireless resource, and continues the current call by using the data transmitted and received by the wireless resource;

the broadband core network feeds back SIP 200OK signaling indication switching completion to the gateway;

the gateway converts the SIP 200OK signaling into PSIP 200OK signaling and sends the PSIP 200OK signaling to the narrowband core network.

Referring to fig. 9, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by a broadband core network to which the broadband serving cell belongs; the current call is a single call; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the narrow band service cell, and the specific method comprises the following steps:

the narrowband core network inquires about the call context of the current call (such as information of a calling number 15708971878, a called group number 18908157150, a call type, a call attribute and the like);

RRC Connection reconfiguration Complete message RRC Connection reconfiguration Complete and switching from the narrowband service cell to the broadband service cell according to the information of the wireless resource, and continuing the current call by utilizing the wireless resource to receive and transmit data;

Referring to fig. 10, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by the unified converged core network; the current call is a group call; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the narrow band service cell, and the specific method comprises the following steps:

after determining that cell HANDOVER is needed, a terminal initiates a cell HANDOVER request P _ HANDOVER to a unified converged core network through the narrowband trunking base station, wherein the P _ HANDOVER carries a user number of the terminal and a relevant parameter of a Session Description Protocol (SDP);

the unified convergence core network inquires the call context of the current call according to the service channel of the terminal;

the unified converged core network will instruct the broadband cluster base station controlled by the unified converged core network to allocate wireless resources for the current call according to the number of the terminal, the SDP of the terminal and the call context;

Referring to fig. 11, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by the unified converged core network; the current call is a group call; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the broadband service cell, and the specific method comprises the following steps:

after determining that cell switching is needed, the terminal broadcasts a trunk HANDOVER REQUEST to the unified fusion core network through the broadband cluster base station, and the REQUEST carries the number of the terminal, the SDP parameter of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the unified convergence core network inquires the context of the current call (the information of the calling number, the called group number, the call type, the call attribute and the like) according to the LAI of the service channel and the number of the service channel of the terminal;

the unified converged core network will instruct the broadband cluster base station controlled by the unified converged core network to allocate wireless resources for the current call according to the number of the terminal, the SDP parameter of the terminal and the call context;

Referring to fig. 12, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by the unified converged core network; the current call is a single call; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the narrow band service cell, and the specific method comprises the following steps:

the unified converged core network queries the call context (such as information of a calling number 15708971878, a called group number 18908157150, a call type, a call attribute, and the like) of the current call according to the service channel where the terminal is located;

the terminal sends RRC Connection reconfiguration complete message RRC Connection reconfiguration complete to the broadband cluster base station, switches from the narrowband service cell to the broadband service cell according to the information of the wireless resource, and continues the current call by using the wireless resource to receive and transmit data.

Referring to fig. 13, in this embodiment, the radio resource is allocated to the current call in real time when the broadband cluster base station corresponding to the broadband serving cell is handed over, and the broadband cluster base station is controlled by the unified converged core network; the current call is a single call; the terminal is currently located in a narrow band service cell, and to be switched to a broadband service cell to continue a current call, the terminal initiates a switching request by the broadband service cell, and the specific method comprises the following steps:

the unified converged core network inquires the context of the current call (the information of the calling number, the called group number, the call type, the call attribute and the like) according to the LAI and the service channel number;

In this embodiment, a terminal participating in a current call in a narrowband serving cell may obtain information of radio resources of the current call existing in a broadband serving cell, and may switch from the narrowband serving cell to the broadband serving cell according to the information of the radio resources and continue the current call by using the radio resources.

Referring to fig. 14, a terminal 1400 according to an embodiment of the present invention includes:

a calling module 1401, configured to participate in a current call in a narrowband serving cell, where the terminal has registration in both a broadband serving cell and the narrowband serving cell;

an obtaining module 1402, configured to obtain information of radio resources of the current call in which the calling module participates in the broadband serving cell;

a processing module 1403, configured to switch from the narrowband serving cell to the broadband serving cell according to the information of the radio resource obtained by the obtaining module and continue the current call by using the radio resource.

Optionally, the obtaining module 1402 includes:

a request unit, configured to request a core network device to allocate a radio resource in the broadband serving cell for the current call;

a first obtaining unit, configured to receive the information of the radio resource sent by the broadband cluster base station corresponding to the broadband serving cell.

Optionally, the obtaining module 1402 further includes:

a first judging unit, configured to judge whether the current call is a group call, and if so, the terminal receives broadcast information sent by the broadband serving cell;

a second judging unit, configured to judge whether the terminal participates in the group call according to the broadcast information of the first judging unit, and if not, trigger to request the core network device to allocate radio resources in the broadband serving cell for the current call.

Optionally, the request unit includes:

a first processing subunit, configured to send a cell handover request to the broadband core network through the broadband trunking base station, where the cell handover request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell, so that the broadband core network sends a third cell handover preparation request to the narrowband core network to which the narrowband serving cell belongs, and the third cell handover preparation request includes the number, the SDP, the LAI, and the service channel number, and indicates that the broadband trunking base station allocates radio resources for the current call according to the number, the SDP, and the call context, where the call context is obtained by querying, by the broadband core network, according to a call identity ID sent by the narrowband core network, and the call ID is obtained by querying, by the narrowband core network, according to the LAI and the service channel number.

Optionally, the request unit includes:

a second processing subunit, configured to send, to a narrowband core network to which the narrowband serving cell belongs through a narrowband cluster base station corresponding to the narrowband serving cell, a cell handover request, where the cell handover request carries a number of the terminal and an SDP of the terminal, so that the narrowband core network sends, to the broadband core network, a fourth cell handover preparation request, where the fourth cell handover preparation request carries the number, the SDP and a call identity ID of the current call, the call ID is used by the broadband core network to query a call context of the current call, and the number, and the SDP and the call context are used by the broadband core network to instruct the broadband cluster base station to allocate radio resources for the current call.

Optionally, the request unit includes:

a third processing subunit, configured to send a cell switching request to a broadband core network to which the broadband serving cell belongs through a broadband trunking base station corresponding to the broadband serving cell, so that the broadband core network sends a fifth cell handover preparation request to the narrowband core network to which the narrowband serving cell belongs, the fifth cell handover preparation request includes the number of the terminal, the SDP of the terminal, the LAI of the narrowband serving cell, and the traffic channel number of the narrowband serving cell, and instructs the broadband cluster base station to perform handover according to the traffic channel number included in the first cell handover preparation request, the SDP and the call context allocate radio resources for the current call, the call context is queried and sent by a group-owned narrowband core network to the broadband core network based on a call ID, and the call ID is inquired and sent to the narrowband core network to which the group belongs by the narrowband core network to which the narrowband service cell belongs according to the LAI and the service channel number.

Optionally, the request unit includes:

a fourth processing subunit, configured to send, to a narrowband core network to which the narrowband serving cell belongs through a narrowband cluster base station to which the narrowband serving cell belongs, a cell handover request, where the cell handover request includes a number of the terminal and an SDP of the terminal, so that the narrowband core network to which the narrowband serving cell belongs queries a call ID of the current call and sends the call ID to a group-homed narrowband core network, where the call ID is used by the group-homed narrowband core network to query a call context of the current call, and the number, the SDP and the call context are used by the broadband core network to instruct the broadband cluster base station to allocate radio resources for the current call;

optionally, the request unit includes:

a first judging subunit, configured to judge whether the current call is a single call;

a fifth processing subunit, configured to send, if the current call is a single call, a cell handover request to a broadband core network to which the broadband serving cell belongs through a broadband trunking base station corresponding to the broadband serving cell, so that the broadband core network sends a first cell handover preparation request to a narrowband core network to which the narrowband serving cell belongs, where the first cell handover preparation request includes a number of the terminal, a session description protocol SDP of the terminal, a radio location identifier LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell, and indicates the broadband trunking base station to allocate radio resources to the current call according to the number, the SDP, and a call context, and the call context is queried and sent to the broadband core network by the narrowband core network according to the LAI and the service channel number.

Optionally, the request unit includes:

a second judging subunit, configured to judge whether the current call is a single call;

a sixth processing subunit, configured to send, if the current call is a single call, a cell handover request to a narrowband core network to which the narrowband serving cell belongs through a narrowband cluster base station corresponding to the narrowband serving cell, so that the narrowband core network sends a second cell handover preparation request to the broadband core network, where the second cell handover preparation request carries the number, the SDP and a call context of the current call, where the call context information is obtained by querying by the narrowband core network, and the number and the call context are used by the broadband core network to instruct the broadband cluster base station to allocate radio resources for the current call.

Optionally, the request unit includes:

a seventh processing subunit, configured to send a cell handover request to the unified converged core network through a broadband trunking base station corresponding to the broadband serving cell, where the cell handover request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and the service channel number, so that the unified converged core network queries, according to the LAI and the service channel number, a call context of the current call, and instructs the broadband trunking base station to allocate radio resources for the current call according to the number, the SDP, and the call context.

Optionally, the request unit includes:

an eighth processing subunit, configured to send, to the unified converged core network, a cell handover request through a narrowband trunking base station corresponding to the narrowband serving cell, where the cell handover request includes a number of the terminal and an SDP of the terminal, so that the unified converged core network queries a call context of the current call and instructs the broadband trunking base station to allocate radio resources to the current call according to the number, the SDP, and the call context.

Optionally, the obtaining module 1402 further includes:

a third judging unit, configured to judge whether the current call is a group call, and if so, the terminal receives broadcast information sent by the broadband serving cell;

a fourth determining unit, configured to determine whether the terminal participates in the group call according to the broadcast information, and if so, receive information of the radio resource of the group call sent by a broadband cluster base station corresponding to the broadband serving cell.

In this embodiment, when the calling module 1401 participates in the current call in the narrowband serving cell, the obtaining module 1402 may obtain information of radio resources of the current call in the broadband serving cell, and the processing module 1403 may switch from the narrowband serving cell to the broadband serving cell according to the information of the radio resources and continue the current call by using the radio resources.

The terminal of the above embodiment is described below from the perspective of a hardware device, and referring to fig. 15, the terminal 1500 of the embodiment includes:

a transceiver 1501, a processor 1502, and a bus 1503;

the transceiver 1501, the processor 1502 is connected via the bus 1503;

the transceiver 1501 is configured to execute the following instructions:

the terminal participates in the current call in a narrow-band service cell, and registers in both a broadband service cell and the narrow-band service cell; acquiring information of wireless resources of the current call participated by the call module in the broadband service cell;

the processor 1502 is configured to execute the following instructions:

In addition, the terminal 1500 in this embodiment may further include a memory 1504, the memory 1504 may be used for storing software programs and cache data, and the transceiver 1501 and the memory 1504 may be communicatively connected to the processor 1502 through a bus 1503.

The terminal 1500 of this embodiment may also perform other steps of the foregoing method embodiments, which are not described herein again.

In this embodiment, when the transceiver 1501 participates in the current call in the narrowband serving cell, the processor 1502 may obtain information of radio resources of the current call existing in the broadband serving cell, and the processor 1502 may switch from the narrowband serving cell to the broadband serving cell according to the information of the radio resources and continue the current call by using the radio resources.

Referring to fig. 16, the core network device 1600 provided in this embodiment of the present invention includes:

an allocating module 1601, configured to receive a request from a terminal to allocate a radio resource to a current call in a broadband serving cell, where the terminal participates in the current call in a narrowband serving cell, and the terminal is registered in both the broadband serving cell and the narrowband serving cell;

a sending module 1602, configured to send the information of the radio resource to the terminal, so that the terminal switches from the narrowband serving cell to the broadband serving cell according to the information of the radio resource to continue the current call.

Optionally, when the core network device is a broadband core network to which the broadband serving cell belongs, the allocating module 1601 includes:

a first receiving unit, configured to receive a cell switching request sent by the terminal through the broadband trunking base station;

a first sending unit, configured to send a first cell handover preparation request to a narrowband core network to which the narrowband serving cell belongs, where the first cell handover preparation request includes a number of the terminal, a session description protocol SDP of the terminal, a radio location identity LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell, so that the narrowband core network queries a call context of the current call according to the LAI and the service channel number;

a second receiving unit, configured to receive a second cell handover preparation request sent by the narrowband core network, where the second cell handover preparation request carries the number, the SDP, and the call context;

a first allocating unit, configured to instruct the broadband trunking base station to allocate radio resources for the current call according to the number, the SDP and the call context.

Optionally, when the core network device is a narrowband core network to which the narrowband serving cell belongs, the allocating module 1601 includes:

a third receiving unit, configured to receive a cell switching request sent by the terminal through a narrowband cluster base station corresponding to the narrowband serving cell;

a second sending unit, configured to send a third cell handover preparation request to the broadband core network, where the third cell handover preparation request carries a number of the terminal, an SDP of the terminal, and a call context of the current call, and the call context information is obtained by querying the narrowband core network, so that the broadband core network instructs the broadband cluster base station to allocate radio resources for the current call according to the number, the SDP, and the call context.

Optionally, when the core network device is a unified converged core network, the allocating module 1601 includes:

a fourth receiving unit, configured to receive a cell switching request sent by the terminal through a broadband cluster base station corresponding to the broadband serving cell, where the cell switching request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell;

a first query unit, configured to query a call context of the current call according to the LAI and the service channel number;

a second allocating unit, configured to instruct the broadband trunking base station to allocate radio resources for the current call according to the number, the SDP and the call context.

a fifth receiving unit, configured to receive a cell switching request sent by the terminal through a narrowband trunking base station corresponding to the narrowband serving cell, where the cell switching request includes a number of the terminal and an SDP of the terminal;

a second query unit, configured to query a call context of the current call;

a third allocating unit, configured to instruct the broadband trunking base station to allocate radio resources for the current call according to the number, the SDP and the call context.

a sixth receiving unit, configured to receive a cell handover request sent by the terminal through the broadband trunking base station, where the cell handover request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell;

a third sending unit, configured to send a fourth cell handover preparation request to a narrowband core network to which the narrowband serving cell belongs, where the fourth cell handover preparation request includes the number, the SDP, the LAI, and the service channel number, so that the narrowband core network queries a call identity ID of the current call according to the LAI and the service channel number;

a seventh receiving unit, configured to receive a fifth cell handover preparation request sent by the narrowband core network, where the fifth cell handover preparation request carries the number, the SDP, and the call ID;

a third query unit, configured to query a call context of the current call according to the call ID;

a fourth allocating unit, configured to instruct the broadband trunking base station to allocate radio resources for the current call according to the number, the SDP and the call context.

an eighth receiving unit, configured to receive a cell switching request sent by the terminal through a narrowband cluster base station corresponding to the narrowband serving cell, where the cell switching request carries a number of the terminal and an SDP of the terminal;

a fourth sending unit, configured to send a sixth cell handover preparation request to a broadband core network to which the broadband serving cell belongs, where the sixth cell handover preparation request carries the number, the SDP and a call identity ID of the current call, so that the broadband core network instructs the broadband trunking base station to allocate radio resources for the current call according to the number, the SDP and the call context, and the call context is obtained by querying the current call by the broadband core network according to the call ID.

a ninth receiving unit, configured to receive a cell switching request sent by the terminal through a broadband trunking base station corresponding to the broadband service cell;

a fifth sending unit, configured to send the seventh cell handover preparation request to a narrowband core network to which the narrowband serving cell belongs, where the seventh cell handover preparation request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell, so that the narrowband core network to which the narrowband serving cell belongs sends an eighth cell handover preparation request to a group-homing narrowband core network, where the eighth cell handover preparation request includes the number, the SDP, and a call ID, and the call ID is obtained by querying the narrowband core network to which the narrowband serving cell belongs according to the LAI and the service channel number;

a tenth receiving unit, configured to receive a ninth cell handover preparation request sent by the group of home narrowband core networks, where the ninth cell handover preparation request includes the number, the SDP, and a call context, and the call context is obtained by querying, by the group of home narrowband core networks, according to the call ID;

a fifth allocating unit, configured to instruct the broadband trunking base station to allocate radio resources for the current call according to the number, the SDP and the call context.

In this embodiment, the allocating module 1601 allocates a wireless resource for the terminal in the broadband serving cell after receiving the request sent by the dual-mode terminal, and the sending module 1602 sends the information of the wireless resource to the dual-mode terminal, so that the dual-mode terminal may switch from the narrowband serving cell to the broadband serving cell according to the information of the wireless resource and perform a call by using the wireless resource. By the scheme, the dual-mode terminal can be switched from the narrow-band service cell to the wide-band service cell, the call is continuously kept, and the call drop is avoided.

With reference to fig. 17, the core network device 1700 of the present embodiment is described below with reference to a hardware apparatus, and includes:

a transceiver 1701, a processor 1702 and a bus 1703;

the transceiver 1701, the processor 1702 connected via the bus 1703;

the processor 1702 is configured to execute the following instructions:

receiving a request of a terminal to allocate wireless resources for a current call in a broadband service cell, wherein the terminal participates in the current call in a narrowband service cell, and the terminal is registered in both the broadband service cell and the narrowband service cell;

the transceiver 1701 is configured to execute the following instructions:

and sending the information of the radio resource acquired by the processing module to the terminal, so that the terminal can switch from the narrowband serving cell to the broadband serving cell to continue the current call according to the information of the radio resource.

In addition, the core network device 1700 in this embodiment may further include a memory 1704, where the memory 1704 is used for storing software programs and cache data, and the transceiver 1701 and the memory 1704 are communicatively connected to the processor 1702 through a bus 1703.

The core network device 1700 of this embodiment may also perform other steps of the foregoing method embodiments, which are not described herein again.

In this embodiment, the processor 1702 allocates a radio resource in a broadband serving cell for a dual-mode terminal after receiving a request sent by the dual-mode terminal, and the transceiver 1701 sends information of the radio resource to the dual-mode terminal, so that the dual-mode terminal may switch from the narrowband serving cell to the broadband serving cell according to the information of the radio resource and perform a call by using the radio resource. By the scheme, the dual-mode terminal can be switched from the narrow-band service cell to the wide-band service cell, the call is continuously kept, and the call drop is avoided.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

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

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method of cell handover, comprising:

a terminal participates in current calling in a narrow-band service cell, and the terminal is registered in both a broadband service cell and the narrow-band service cell;

the terminal judges whether the current call is a group call, if so, the terminal receives broadcast information sent by the broadband service cell;

the terminal judges whether the terminal participates in the group call according to the broadcast information, if not, the terminal is triggered to request the core network equipment to allocate wireless resources for the current call in the broadband service cell;

the terminal receives the information of the wireless resources sent by the broadband cluster base station corresponding to the broadband service cell;

and the terminal switches from the narrow-band service cell to the broadband service cell according to the information of the wireless resources and continues the current call by utilizing the wireless resources.

2. The method of claim 1, wherein the terminal requesting a core network device to allocate radio resources in the broadband service cell for the current call comprises:

the terminal sends a cell switching request to a broadband core network through the broadband cluster base station, the cell switching request comprises the number of the terminal, a session description protocol SDP of the terminal, a radio location identification LAI of the narrowband serving cell and a service channel number of the narrowband serving cell, so that the broadband core network sends a third cell handover preparation request to the narrowband core network to which the narrowband serving cell belongs, the third cell handover preparation request includes the number, the SDP, the LAI, and the traffic channel number, and instruct the broadband trunking base station to allocate radio resources for the current call based on the number, the SDP and the call context, the call context is obtained by the broadband core network according to the call identity ID query sent by the narrowband core network, and the call ID is obtained by the narrowband core network according to the LAI and the service channel number.

3. The method of claim 1, wherein the terminal requesting a core network device to allocate radio resources in the broadband service cell for the current call comprises:

the terminal sends a cell switching request to a narrowband core network to which the narrowband service cell belongs through a narrowband cluster base station corresponding to the narrowband service cell, wherein the cell switching request carries a number of the terminal and an SDP of the terminal, so that the narrowband core network sends a fourth cell switching preparation request to a broadband core network, the fourth cell switching preparation request carries the number, the SDP and a call ID of the current call, the call ID is used for the broadband core network to inquire a call context of the current call, and the SDP and the call context are used for the broadband core network to indicate the broadband cluster base station to allocate wireless resources for the current call.

4. The method of claim 1, wherein the terminal requesting a core network device to allocate radio resources in the broadband service cell for the current call comprises:

the terminal sends a cell switching request to a broadband core network to which the broadband service cell belongs through a broadband cluster base station corresponding to the broadband service cell, so that the broadband core network sends a fifth cell handover preparation request to the narrowband core network to which the narrowband serving cell belongs, the fifth cell switching preparation request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a traffic channel number of the narrowband serving cell, and instructing the broadband cluster base station to allocate radio resources for the current call based on the number, the SDP and the call context included, the call context is queried and sent to the broadband core network by the group home narrowband core network according to the call ID, and the call ID is inquired and sent to the group home narrowband core network by the narrowband core network to which the narrowband service cell belongs according to the LAI and the service channel number.

5. The method of claim 1, wherein the terminal requesting a core network device to allocate radio resources in the broadband service cell for the current call comprises:

the terminal sends a cell switching request to a narrowband core network to which the narrowband service cell belongs through a narrowband cluster base station to which the narrowband service cell belongs, wherein the cell switching request comprises a number of the terminal and an SDP (service data center) of the terminal, so that the narrowband core network to which the narrowband service cell belongs inquires a call ID of the current call and sends the call ID to a group-attributive narrowband core network, the call ID is used for the group-attributive narrowband core network to inquire a call context of the current call, and the number and the call context are used for a broadband core network to indicate the broadband cluster base station to allocate wireless resources for the current call.

6. The method of claim 1, wherein the terminal requesting a core network device to allocate radio resources in the broadband service cell for the current call comprises:

the terminal judges whether the current call is a single call;

if the current call is a single call, the terminal sends a cell switching request to a broadband core network to which the broadband service cell belongs through a broadband cluster base station corresponding to the broadband service cell, so that the broadband core network sends a first cell switching preparation request to a narrowband core network to which the narrowband service cell belongs, the first cell switching preparation request comprises a number of the terminal, an SDP of the terminal, an LAI of the narrowband service cell and a service channel number of the narrowband service cell, and indicates the broadband cluster base station to allocate wireless resources for the current call according to the number, the SDP and a call context, and the call context is inquired by the narrowband core network according to the LAI and the service channel number and is sent to the broadband core network.

7. The method of claim 1, wherein the terminal requesting a core network device to allocate radio resources in the broadband service cell for the current call comprises:

the terminal judges whether the current call is a single call;

if the current call is a single call, the terminal sends a cell switching request to a narrowband core network to which the narrowband service cell belongs through a narrowband cluster base station corresponding to the narrowband service cell, so that the narrowband core network sends a second cell switching preparation request to a broadband core network, the second cell switching preparation request carries a number, an SDP (service description protocol) and a call context of the current call, the call context information is obtained by inquiring the narrowband core network, and the number, the SDP and the call context are used for the broadband core network to indicate the broadband cluster base station to allocate wireless resources for the current call.

8. The method of claim 1, wherein the terminal requesting a core network device to allocate radio resources in the broadband service cell for the current call comprises:

the terminal sends a cell switching request to a unified converged core network through a broadband cluster base station corresponding to the broadband service cell, wherein the cell switching request comprises the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and a service channel number, so that the unified converged core network inquires the call context of the current call according to the LAI and the service channel number and indicates the broadband cluster base station to allocate wireless resources for the current call according to the number, the SDP and the call context.

9. The method of claim 1, wherein the terminal requesting a core network device to allocate radio resources in the broadband service cell for the current call comprises:

the terminal sends a cell switching request to a unified converged core network through a narrowband trunked base station corresponding to the narrowband service cell, wherein the cell switching request comprises the number of the terminal and the SDP of the terminal, so that the unified converged core network inquires the call context of the current call and indicates the broadband trunked base station to allocate wireless resources for the current call according to the number, the SDP and the call context.

10. The method of claim 1, wherein the terminal acquiring the information of the radio resources of the current call in the broadband serving cell comprises:

and the terminal judges whether the terminal participates in the group call according to the broadcast information, and if so, the terminal receives the information of the wireless resource of the current call, which is sent by a broadband cluster base station corresponding to the broadband service cell.

11. A terminal, comprising:

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

an acquisition module, the acquisition module further comprising:

a second judging unit, configured to judge whether the terminal participates in the group call according to the broadcast information of the first judging unit, and if not, trigger the requesting unit;

the request unit is used for requesting the core network equipment to allocate wireless resources in the broadband service cell for the current call;

a first obtaining unit, configured to receive information of the radio resource sent by a broadband cluster base station corresponding to the broadband serving cell;

and the processing module is used for switching the narrowband service cell to the broadband service cell according to the information of the wireless resources acquired by the acquisition module and continuing the current call by using the wireless resources.

12. The terminal of claim 11, wherein the requesting unit comprises:

a first processing subunit, configured to send a cell handover request to a broadband core network through a broadband trunking base station, the cell switching request includes the number of the terminal, the SDP of the terminal, the LAI of the narrowband serving cell and the service channel number of the narrowband serving cell, so that the broadband core network sends a third cell handover preparation request to the narrowband core network to which the narrowband serving cell belongs, the third cell handover preparation request includes the number, the SDP, the LAI, and the traffic channel number, and instruct the broadband trunking base station to allocate radio resources for the current call based on the number, the SDP and the call context, the call context is obtained by the broadband core network according to the call identity ID query sent by the narrowband core network, and the call ID is obtained by the narrowband core network according to the LAI and the service channel number.

13. The terminal of claim 11, wherein the requesting unit comprises:

a second processing subunit, configured to send a cell handover request to a narrowband core network to which the narrowband serving cell belongs through a narrowband cluster base station corresponding to the narrowband serving cell, where the cell handover request carries a number of the terminal and an SDP of the terminal, so that the narrowband core network sends a fourth cell handover preparation request to a broadband core network, where the fourth cell handover preparation request carries the number, the SDP and a call identity ID of the current call, the call ID is used for the broadband core network to query a call context of the current call, and the number, the SDP and the call context are used for the broadband core network to instruct the broadband cluster base station to allocate radio resources for the current call.

14. The terminal of claim 11, wherein the requesting unit comprises:

a third processing subunit, configured to send a cell switching request to a broadband core network to which the broadband serving cell belongs through a broadband trunking base station corresponding to the broadband serving cell, so that the broadband core network sends a fifth cell handover preparation request to the narrowband core network to which the narrowband serving cell belongs, the fifth cell switching preparation request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a traffic channel number of the narrowband serving cell, and instructing the broadband cluster base station to allocate radio resources for the current call based on the number, the SDP and the call context included, the call context is queried and sent to the broadband core network by the group home narrowband core network according to the call ID, and the call ID is inquired and sent to the group home narrowband core network by the narrowband core network to which the narrowband service cell belongs according to the LAI and the service channel number.

15. The terminal of claim 11, wherein the requesting unit comprises:

a fourth processing subunit, configured to send, through a narrowband trunking base station to which the narrowband serving cell belongs, a cell handover request to a narrowband core network to which the narrowband serving cell belongs, where the cell handover request includes a number of the terminal and an SDP of the terminal, so that the narrowband core network to which the narrowband serving cell belongs queries a call ID of the current call and sends the call ID to a group-owned narrowband core network, where the call ID is used by the group-owned narrowband core network to query a call context of the current call, and the number, the SDP and the call context are used by a broadband core network to instruct a broadband trunking base station to allocate radio resources for the current call.

16. The terminal of claim 11, wherein the requesting unit comprises:

the first judging subunit is used for judging whether the current call is a single call;

a fifth processing subunit, configured to send a cell handover request to a broadband core network to which the broadband serving cell belongs through a broadband trunking base station corresponding to the broadband serving cell if the current call is a single call, so that the broadband core network sends a first cell handover preparation request to a narrowband core network to which the narrowband serving cell belongs, the first cell handover preparation request includes a number of the terminal, a session description protocol, SDP, of the terminal, a radio location identification number LAI of the narrowband serving cell and a traffic channel number of the narrowband serving cell, and instruct the broadband trunking base station to allocate radio resources for the current call based on the number, the SDP and the call context, and the call context is inquired and sent to the broadband core network by the narrowband core network according to the LAI and the service channel number.

17. The terminal of claim 11, wherein the requesting unit comprises:

the second judging subunit is used for judging whether the current call is a single call;

a sixth processing subunit, configured to send, if the current call is a single call, a cell handover request to a narrowband core network to which the narrowband serving cell belongs through a narrowband trunking base station corresponding to the narrowband serving cell, so that the narrowband core network sends a second cell handover preparation request to a broadband core network, where the second cell handover preparation request carries a number, an SDP, and a call context of the current call, where the call context information is obtained by querying the narrowband core network, and the number, the SDP, and the call context are used by the broadband core network to instruct the broadband trunking base station to allocate radio resources for the current call.

18. The terminal of claim 11, wherein the requesting unit comprises:

a seventh processing subunit, configured to send a cell handover request to a unified converged core network through a broadband trunking base station corresponding to the broadband serving cell, where the cell handover request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a service channel number, so that the unified converged core network queries a call context of the current call according to the LAI and the service channel number, and instructs the broadband trunking base station to allocate radio resources for the current call according to the number, the SDP, and the call context.

19. The terminal of claim 11, wherein the requesting unit comprises:

an eighth processing subunit, configured to send, to a unified converged core network, a cell handover request through a narrowband trunking base station corresponding to the narrowband serving cell, where the cell handover request includes a number of the terminal and an SDP of the terminal, so that the unified converged core network queries a call context of the current call and instructs the broadband trunking base station to allocate radio resources to the current call according to the number, the SDP, and the call context.

20. The terminal of claim 11, wherein the obtaining module further comprises:

and a fourth judging unit, configured to judge whether the terminal participates in the group call according to the broadcast information, and if yes, receive information of the wireless resource of the group call, which is sent by a broadband cluster base station corresponding to the broadband serving cell.

21. A terminal, comprising:

a transceiver, a processor and a bus;

the transceiver and the processor are connected through the bus;

the processor is configured to execute the following instructions:

the terminal participates in the current call in a narrow-band service cell, and the terminal is registered in both a broadband service cell and the narrow-band service cell;

judging whether the current call is a group call, if so, receiving broadcast information sent by the broadband service cell by the transceiver;

judging whether the terminal participates in the group call according to the broadcast information, if not, triggering the terminal to request core network equipment to allocate wireless resources for the current call in the broadband service cell;

the transceiver is used for executing the following instructions:

receiving the information of the wireless resources sent by a broadband cluster base station corresponding to the broadband service cell;

the processor is configured to execute the following instructions:

and switching from the narrow-band service cell to the broadband service cell according to the information of the wireless resources acquired by the acquisition module and continuing the current call by using the wireless resources.

22. A method of cell handover, comprising:

if the terminal does not participate in the current call in the broadband service cell and the current call is a group call, the core network equipment receives the request of the terminal to allocate wireless resources for the current call in the broadband service cell, the terminal participates in the current call in the narrowband service cell, and the terminal is registered in both the broadband service cell and the narrowband service cell;

and the core network equipment sends the information of the wireless resources to the terminal, so that the terminal can be switched from the narrowband serving cell to the broadband serving cell to continue the current call according to the information of the wireless resources.

23. The method of claim 22, wherein when the core network device is a broadband core network to which the broadband serving cell belongs, the core network device receiving a request of a terminal to allocate radio resources for a current call in the broadband serving cell comprises:

the broadband core network receives a cell switching request sent by the terminal through a broadband cluster base station;

and the broadband core network indicates the broadband trunking base station to allocate wireless resources to the current call according to the number, the SDP and the call context.

24. The method of claim 22, wherein when the core network device is a narrowband core network to which the narrowband serving cell belongs, the core network device receiving a request of a terminal to allocate radio resources in a broadband serving cell for a current call comprises:

the narrowband core network sends a third cell switching preparation request to a broadband core network, wherein the third cell switching preparation request carries the number of the terminal, the SDP of the terminal and the call context of the current call, and the call context information is obtained by the narrowband core network through query, so that the broadband core network indicates a broadband cluster base station to allocate wireless resources for the current call according to the number, the SDP and the call context.

25. The method of claim 22, wherein when the core network device is a unified converged core network, the core network device receiving a request from a terminal to allocate radio resources for a current call in a broadband service cell comprises:

and the unified fusion core network indicates the broadband trunking base station to allocate wireless resources for the current call according to the number, the SDP and the call context.

26. The method of claim 22, wherein when the core network device is a unified converged core network, the core network device receiving a request from a terminal to allocate radio resources for a current call in a broadband service cell comprises:

and the unified fusion core network indicates the broadband cluster base station to allocate wireless resources for the current call according to the number, the SDP and the call context.

27. The method of claim 22, wherein when the core network device is a broadband core network to which the broadband serving cell belongs, the core network device receiving a request of a terminal to allocate radio resources for a current call in the broadband serving cell comprises:

the broadband core network receives a cell switching request sent by the terminal through a broadband cluster base station, wherein the cell switching request comprises the number of the terminal, the SDP of the terminal, the LAI of the narrowband service cell and the service channel number of the narrowband service cell;

the broadband core network sends a fourth cell switching preparation request to a narrowband core network to which the narrowband serving cell belongs, wherein the fourth cell switching preparation request comprises the number, the SDP, the LAI and the service channel number, so that the narrowband core network queries the call identity ID of the current call according to the LAI and the service channel number;

28. The method of claim 22, wherein when the core network device is a narrowband core network to which the narrowband serving cell belongs, the core network device receiving a request of a terminal to allocate radio resources in a broadband serving cell for a current call comprises:

the narrowband core network sends a sixth cell switching preparation request to a broadband core network to which the broadband service cell belongs, wherein the sixth cell switching preparation request carries the number, the SDP and the call identity ID of the current call, so that the broadband core network indicates a broadband cluster base station to allocate wireless resources for the current call according to the number, the SDP and a call context, and the call context is obtained by the broadband core network inquiring the current call according to the call ID.

29. The method of claim 22, wherein when the core network device is a broadband core network to which the broadband serving cell belongs, the core network device receiving a request of a terminal to allocate radio resources for a current call in the broadband serving cell comprises:

the broadband core network receives a ninth cell switching preparation request sent by the group home narrowband core network, wherein the ninth cell switching preparation request comprises the number, the SDP and a calling context, and the calling context is obtained by the group home narrowband core network according to the calling ID;

30. The method of claim 22, wherein when the core network device is a narrowband core network to which the narrowband serving cell belongs, the core network device receiving a request of a terminal to allocate radio resources in a broadband serving cell for a current call comprises:

the narrowband core network to which the narrowband service cell belongs sends a tenth cell switching preparation request to a group-attributive narrowband core network, wherein the tenth cell switching preparation request carries the number of the terminal, the SDP of the terminal and the call ID, so that the group-attributive narrowband core network sends an eleventh cell switching preparation request to the broadband core network to which the broadband service cell belongs, the eleventh cell switching preparation request comprises the number, the SDP and a call context, the call context is obtained by the group-attributive narrowband core network according to the call ID, and the number, the SDP and the call context are used for the broadband core network to indicate a broadband cluster base station to allocate wireless resources for the current call.

31. A core network device, comprising:

the terminal comprises a distribution module, a receiving module and a processing module, wherein the distribution module is used for receiving a request of a terminal to distribute wireless resources for a current call in a broadband service cell if the terminal does not participate in the current call in the broadband service cell and the current call is a group call, the terminal participates in the current call in a narrowband service cell, and the terminal is registered in both the broadband service cell and the narrowband service cell;

a sending module, configured to send the information of the radio resource to the terminal, so that the terminal may switch from the narrowband serving cell to the broadband serving cell according to the information of the radio resource to continue the current call.

32. The core network device according to claim 31, wherein when the core network device is a broadband core network to which the broadband serving cell belongs, the allocating module includes:

a first receiving unit, configured to receive a cell switching request sent by the terminal through a broadband trunking base station;

a first allocating unit, configured to instruct the broadband trunking base station to allocate radio resources to the current call according to the number, the SDP and the call context.

33. The core network device of claim 31, wherein when the core network device is a narrowband core network to which the narrowband serving cell belongs, the allocating module includes:

a third receiving unit, configured to receive a cell switching request sent by the terminal through a narrowband trunking base station corresponding to the narrowband serving cell;

a second sending unit, configured to send a third cell handover preparation request to a broadband core network, where the third cell handover preparation request carries a number of the terminal, an SDP of the terminal, and a call context of the current call, and the call context information is obtained by querying the narrowband core network, so that the broadband core network instructs a broadband trunking base station to allocate radio resources for the current call according to the number, the SDP, and the call context.

34. The core network device according to claim 31, wherein when the core network device is a unified converged core network, the allocating module comprises:

a fourth receiving unit, configured to receive a cell handover request sent by the terminal through a broadband cluster base station corresponding to the broadband serving cell, where the cell handover request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell;

and a second allocating unit, configured to instruct the broadband trunking base station to allocate radio resources to the current call according to the number, the SDP and the call context.

35. The core network device according to claim 31, wherein when the core network device is a unified converged core network, the allocating module comprises:

a second query unit, configured to query a call context of the current call;

a third allocating unit, configured to instruct the broadband trunking base station to allocate radio resources to the current call according to the number, the SDP, and the call context.

36. The core network device according to claim 31, wherein when the core network device is a broadband core network to which the broadband serving cell belongs, the allocating module includes:

a sixth receiving unit, configured to receive a cell handover request sent by the terminal through a broadband trunking base station, where the cell handover request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell;

a fourth allocating unit, configured to instruct the broadband trunking base station to allocate radio resources to the current call according to the number, the SDP, and the call context.

37. The core network device of claim 31, wherein when the core network device is a narrowband core network to which the narrowband serving cell belongs, the allocating module includes:

a fourth sending unit, configured to send a sixth cell handover preparation request to a broadband core network to which the broadband serving cell belongs, where the sixth cell handover preparation request carries the number, the SDP, and the call identity ID of the current call, so that the broadband core network indicates a broadband trunking base station to allocate radio resources to the current call according to the number, the SDP, and the call context is obtained by querying the current call by the broadband core network according to the call ID.

38. The core network device according to claim 31, wherein when the core network device is a broadband core network to which the broadband serving cell belongs, the allocating module includes:

a ninth receiving unit, configured to receive a cell switching request sent by the terminal through a broadband trunking base station corresponding to the broadband serving cell;

a fifth sending unit, configured to send a seventh cell handover preparation request to a narrowband core network to which the narrowband serving cell belongs, where the seventh cell handover preparation request includes a number of the terminal, an SDP of the terminal, an LAI of the narrowband serving cell, and a service channel number of the narrowband serving cell, so that the narrowband core network to which the narrowband serving cell belongs sends an eighth cell handover preparation request to a group-homing narrowband core network, where the eighth cell handover preparation request includes the number, the SDP, and a call ID, and the call ID is obtained by querying the narrowband core network to which the narrowband serving cell belongs according to the LAI and the service channel number;

a tenth receiving unit, configured to receive a ninth cell handover preparation request sent by the group home narrowband core network, where the ninth cell handover preparation request includes the number, the SDP, and a call context, and the call context is obtained by querying, by the group home narrowband core network, according to the call ID;

and a fifth allocating unit, configured to instruct the broadband trunking base station to allocate radio resources to the current call according to the number, the SDP, and the call context.

39. The core network device of claim 31, wherein when the core network device is a narrowband core network to which the narrowband serving cell belongs, the allocating module includes:

an eleventh receiving unit, configured to receive a cell handover request sent by the terminal through a narrowband trunking base station to which the narrowband serving cell belongs, where the cell handover request includes a number of the terminal and an SDP of the terminal;

a fourth query unit, configured to query the call ID of the current call;

a sixth sending unit, configured to send a tenth cell handover preparation request to a group-homing narrowband core network, where the tenth cell handover preparation request carries a number of the terminal, an SDP of the terminal, and the call ID, so that the group-homing narrowband core network sends an eleventh cell handover preparation request to a broadband core network to which the broadband serving cell belongs, where the eleventh cell handover preparation request includes the number, the SDP, and a call context, where the call context is obtained by querying the group-homing narrowband core network according to the call ID, and the number, the SDP, and the call context are used by the broadband core network to instruct a broadband cluster base station to allocate radio resources for the current call.

40. A core network device, comprising:

a transceiver, a processor and a bus;

the transceiver is connected with the processor through the bus;

the processor is configured to execute the following instructions if the terminal does not participate in the current call in the broadband serving cell and the current call is a group call: receiving a request of the terminal to allocate wireless resources for the current call in the broadband serving cell, wherein the terminal participates in the current call in a narrowband serving cell, and the terminal is registered in both the broadband serving cell and the narrowband serving cell;

the transceiver is used for executing the following instructions: and sending the information of the wireless resources acquired by the processing module to the terminal, so that the terminal can switch from the narrowband serving cell to the broadband serving cell to continue the current call according to the information of the wireless resources.