CN101895944B - Handover switching method for notice-type group call of clustering multi-switchboard based on SIP (Session Initiation Protocol) - Google Patents
Handover switching method for notice-type group call of clustering multi-switchboard based on SIP (Session Initiation Protocol) Download PDFInfo
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Abstract
The invention discloses a handover method for notice-type group call of a clustering multi-switchboard based on an SIP (Session Initiation Protocol), which is characterized by being a method for modifying the SIP as follows and realizing the handover of the notice-type group call of a clustering multi-switchboard according to the modified SIP. A mobile station in the group call communication automatically selects a new base station having better communication condition and initiates the handover of the notice-type group call to the original base station by using an air interface signaling; the air interface signaling includes the position mark information of the new base station; the original base station initiates the handover of the notice-type group call to the connected switchboard according to the internal signaling; the switchboard judges that the new base station is connected with the other switchboard according to the position mark information of the new base station; the communication link is established by a group call controller and the service channel is acquired to realize the handover group call communication without interruption. The invention solves the problem of maintaining signaling of the group call communication without interruption when the cluster mobile station moves among the switchboards; the switching time is shortened, the switching speed is increased and the utilization rate of the channel is improved.
Description
Technical field
The present invention relates to a kind of cluster wireless communication technology; Especially in a kind of trunking communicating technology based on SIP (Session Initiation Protocol; By ietf definition; An IP-based application layer control protocol) calling talk technology, specifically a kind of cluster switch-spanning notice-type group call method of handover based on SIP.
Background technology
As everyone knows, trunked mobile communication system is a kind of specific schedule GSM of efficient use radio channel resource, is called for short group system.Group system can be automatically, fair, in an orderly manner whole telephone traffics are assigned on all available channels, make a plurality of wireless channels dynamically share telephone traffic, be that a large amount of users provides the radio communication service guarantee with a spot of frequency resource.System has the spectrum efficiency height; Connecting time is short; Support priority level, but intrusion, toll breakdown, individual calling, group calling, group busy; And the professional required advantage of specific schedule such as encryption commander, be the best solution that satisfies specialties such as army, public safety, government, large enterprise and emergency communication demand.
The formation of group system is generally as shown in Figure 1, a plurality of base stations of each switch management (sub-district), and have the group calling controlled function, interconnect between each switch.
Group calling is extremely important and useful business function in the group system, and it can be organized into groups relevant communication object according to the task needs in advance, when executing the task, they is carried out unified commander and scheduling, to improve scheduling and commander's efficient.
The agreement flow process of group calling is as shown in Figure 2, and (1) caller travelling carriage is initiated the group calling request through air interface signaling to current base station, and the base station is initiated the group calling request through interior signaling to switch; (2) switch inquires the group calling controller (switch) of this group according to called group number, and sends the group calling request to it; (3) the group calling controller is inquired about the exchanger information that this group membership belongs to after receiving the group calling request, and initiates the group calling request to it; (4) each member switch is initiated the group calling request through interior signaling to the base station, and the base station is through air interface signaling group call member travelling carriage, and the group calling signaling procedure is accomplished.The voice flow of group calling is as shown in Figure 2, is unidirectional, the information of group calling controller management member switch.
Cluster switch-spanning notice-type group call handover is meant the cluster mobile station that is in the calling talk, switches to the base station that another switch connects from a base station that switch connected, and keeps the uninterrupted of travelling carriage calling talk.
The deficiency that prior art exists:
(1) domestic previous generation trunked communication system MPT1327 though realized the networking between the multi-exchange, does not possess the group calling hand-off functionality of switch-spanning.
(2) the cluster protocol standard (for example, TETRA, iDEN, DMR) of a new generation provides the air interface protocol of handover, but for the handover procedure of switch-spanning in the group system a unified interswitch protocol is not provided.
(3) in the PLMN, the individual calling user can realize the handover of switch-spanning, and keeps the uninterrupted of conversation; But the function of group calling is immature, does not more realize the handover of group calling.
In existing mobile core network, based on character-coded Session Initiation Protocol use flexibly, versatility is good, be easy to expansion, be the developing direction of core net call control protocol, but lack method and the field that is used for the group system handover in the Session Initiation Protocol.
Summary of the invention
The objective of the invention is in carrying out calling talk, to lack efficient feasible switch-spanning changing method to existing wireless trunking communication system; Cause the problem that is difficult to apply, a kind of cluster switch-spanning notice-type group call method of handover based on SIP is provided.
Technical scheme of the present invention is:
A kind of cluster switch-spanning notice-type group call method of handover based on SIP is characterized in that:
Be in the travelling carriage of calling talk, select the better new base station of a communication condition automatically, use air interface signaling, initiate the notice-type group call handover, carried the station location marker information of new base station in the air interface signaling to former base station; To company switch initiation notice-type group call handover, switch judges that new base station is connected another switch, at this moment according to the station location marker information of new base station through interior signaling in former base station
(1) former switch (switch that former base station connects) sends SIP method PREPARE and gives the group calling controller; And through the group calling controller, to new switch (new switch that the base station connects) request notice-type group call handover (group calling controller management group-calling process); Participated in this group calling like new switch, then the group calling controller uses the traffic channel information of PREPARE after new switch request travelling carriage is handed over to new base station, and new switch carries traffic channel information in response OK (success response 200 among the SIP);
(2) do not participate in this group calling like new switch; Then the group calling controller uses earlier PREPARE to new switch request group calling handover number; Use SIP method INVITE to call out this group calling handover number then; Set up communication link with new switch, and obtain the traffic channel information that new base station assigns is given the handover travelling carriage;
(3) the group calling controller carries traffic channel information in giving the response OK of former switch;
(4) if the travelling carriage of handover is sending voice, former switch then need use SIP method UPDATE to change the voice flow direction between clustering switch;
Former switch is after receiving the response OK of group calling controller; The traffic channel information that carries is issued the base station through interior signaling; The base station sends to travelling carriage through air interface signaling; Travelling carriage switches to new service in base station channel and converses, and realizes the cluster switch-spanning notice-type group call handover based on SIP.
Before realizing switch-spanning notice-type group call handover, can revise as follows Session Initiation Protocol earlier:
1. increase the PREPARE method, be used to apply for the notice-type group call handover of inter-exchange;
2. expand the purposes of INVITE, make it to be applicable in the group system and to call out group calling handover number;
3. increase header field field Handover-Number and P-Access-Network-Info, wherein Handover-Number is used to carry group calling handover number, and P-Access-Network-Info is used to carry the station location marker information or the traffic channel information of base station;
4. increase the header field value, Event header field value handover-num representes to ask group calling handover number, To header field value q:30 to represent group calling handover numbers 30, and Content-Type header field value media-inversion representes to revise the direction of voice flow;
5. increase the header field parameter, To header field parametric t=g:5000 representes that sets of numbers 5000, a=p:2000001 represent the travelling carriage number 2000001 in district more, media parameter t=name:m50.n61; Lai:21 representes to send the switch and the base station of voice.
Beneficial effect of the present invention:
(1) the invention provides the travelling carriage inter-exchange method of handover that is in the calling talk state in a kind of trunked communication system, solved the signaling problem that keeps uninterrupted calling talk between switch when cluster mobile station moves.
(2) in the handoff procedure of inter-exchange, use group calling handover number, avoid mobile user data in the handoff procedure, practiced thrift switching time, accelerated switch speed the moving of inter-exchange.
(3) in handoff procedure, taken into full account the nervous characteristics of channel resource in the group system, combining channel has been carried out in same group calling, to improve the utilance of channel.
(4) in trunked communication system; Owing to use half-duplex mode to communicate; The voice flow of inter-exchange is unidirectional; Fully taken into account these characteristics in the present invention, in talker's handoff procedure, increased the media modification signaling, to guarantee the correctness of inter-exchange voice flow direction.
Description of drawings
Fig. 1 is the general formation sketch map of trunked communication system.
Fig. 2 is the agreement schematic flow sheet of group calling in the trunked communication system.
Fig. 3 is the agreement schematic flow sheet of notice-type group call handover inter-exchange in the trunked communication system of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
As shown in Figure 3.
A kind of cluster switch-spanning notice-type group call method of handover based on SIP; Can make amendment to Session Initiation Protocol according to the following steps earlier; Carry out switch-spanning notice-type group call handover then, also can adopt other conventional signaling directly to carry out switch-spanning notice-type group call handover: wherein by following method
Amending method to Session Initiation Protocol is following:
1. increase the PREPARE method, be used to apply for the notice-type group call handover of inter-exchange;
2. expand the purposes of INVITE, make it can be used for group system and call out group calling handover number;
3. increase header field field Handover-Number and P-Access-Network-Info; Wherein Handover-Number is used to carry group calling handover number, and P-Access-Network-Info is used to carry the station location marker information of base station or the function of traffic channel information;
4. increase the header field value, Event header field value handover-num representes to ask group calling handover number, To header field value q:30 to represent group calling handover numbers 30, and Content-Type header field value media-inversion representes to revise the direction of voice flow;
5. increase the header field parameter, To header field parametric t=g:5000 representes that sets of numbers 5000, a=p:2000001 represent the travelling carriage number 2000001 in district more, media parameter t=name:m50.n61; Lai:21 representes to send the switch and the base station of voice.
The step that realizes switch-spanning notice-type group call handover is following:
Be in the travelling carriage of calling talk, select the better new base station of a communication condition automatically, use air interface signaling, initiate the notice-type group call handover, carried the station location marker information of new base station in the air interface signaling to former base station; To company switch initiation notice-type group call handover, switch judges that according to the station location marker information of new base station new base station is connected another switch through interior signaling in former base station;
(1) former switch (switch that former base station connects) sends SIP method PREPARE and gives the group calling controller; And through the group calling controller, to new switch (new switch that the base station connects) request notice-type group call handover (group calling controller management group-calling process);
(2) participated in this group calling like new switch, then the group calling controller uses the traffic channel information of PREPARE after new switch request travelling carriage is handed over to new base station, and new switch carries traffic channel information in the OK of response;
(3) do not participate in this group calling like new switch; Then the group calling controller uses earlier PREPARE to new switch request group calling handover number; Use SIP method INVITE to call out this group calling handover number then; Set up communication link with new switch, and obtain the traffic channel information that new base station assigns is given the handover travelling carriage;
(4) the group calling controller carries traffic channel information in giving the response message OK of former switch;
(5) if the travelling carriage of handover is sending voice, former switch then need use SIP method UPDATE to change the voice flow direction between clustering switch;
Former switch is after receiving the response OK of group calling controller; The traffic channel information that carries is issued the base station through interior signaling; The base station sends to travelling carriage through air interface signaling; Travelling carriage switches to new service in base station channel and converses, and realizes the cluster switch-spanning notice-type group call handover based on SIP.
Details are as follows:
In the notice-type group call handover; When a travelling carriage that is in calling talk is handed over to another switch from a base station and connects the base station; Uninterrupted for what keep conversing, must carry out some Signalling exchanges in advance and give the Traffic Channel of travelling carriage to obtain new base station assigns.
Step 4; The group calling controller judges according to the information of calling list whether new switch has participated in this group calling after receiving the PREPARE method; If new switch has been participated in this group calling, then the group calling controller uses the traffic channel information of PREPARE after new switch request travelling carriage is handed over to new base station; If new switch is not participated in this group calling, then the group calling controller sends PREPARE method request group calling handover number to new switch;
Step 6, group calling controller are transmitted to former switch after receiving the OK that carries new BTS service channel information;
Step 8; Former switch sends to former base station through interior signaling with new service in base station channel information; Former base station sends to new service in base station channel information through air interface signaling the travelling carriage of request handover; This travelling carriage switches to new service in base station channel immediately and continues communication, has realized the notice-type group call handover;
Step 9, if the travelling carriage of request notice-type group call handover is sending voice, after the signaling above then accomplishing, former switch also will be revised the voice flow direction of inter-exchange according to the interior signaling of former base station; Former switch changes its voice flow direction from the group calling controller into receives voice; Former switch uses SIP method UPDATE request group calling controller to revise the voice flow direction, and the group calling controller will send out voice, and the person changes new switch into by former switch; The group calling controller uses SIP method UPDATE to ask new switch to revise the voice flow direction, and new switch changes its voice flow direction to the group calling controller into sends out voice.
Below be the concrete Session Initiation Protocol that uses in a kind of notice-type group call handover that designs according to the method for the invention:
1.PREPARE
The former switch of * * * * * * * * * * * * * * * *-group calling controller * * * * * * * * * * * * * * * * * * * * *
PREPARE s:m50.n61; M=192.168.1.145 (domain name and the address of new switch that the base station connects)
Via:m40.n61;3
Max-Forwards:70
From:<p:2000001>;tag=9893
To:tag=1235
Call-ID:123ABCDE
Cseq:1
Route: < m60.n61; M=192.168.1.146>(group calling controller domain name and IP address)
P-Access-Network-Info:b=21 (the station location marker information of new base station)
Content-Length:0
2.PREPARE
* * * * * * * * * * * * * * * * group calling controller-new switch * * * * * * * * * * * * * * * * * * * * *
PREPARE s:m50.n61 (new switch domain name)
Via:m60.n61;4
Max-Forwards:70
From:<p:2000001>;tag=1236
To:
Call-ID:123ABCDE
Cseq:1
Contact:<s:m60.n61;m=192.168.1.146>
P-Access-Network-Info:b=21 (the station location marker information of new base station)
Content-Length:0
3.?OK
The new switch of * * * * * * * * * * * * * * * *-group calling controller * * * * * * * * * * * * * * * * * * * * *
200
Via:m60.n61;4
From:<p:2000001>;tag=1236
To:tag=8846
Call-ID:123ABCDE
P-Access-Network-Info:c=201.1-1 (new service in base station channel information)
Cseq:1?PREPARE
Content-Length:0
4.PREPARE
* * * * * * * * * * * * * * * * group calling controller-new switch * * * * * * * * * * * * * * * * * * * * *
PREPARE s:m50.n61 (new switch domain name)
Via:m60.n61;4
Max-Forwards:70
From:<p:2000001>;tag=1236
To:<g:5000>
Call-ID:123ABCDE
Cseq:1
Contact:<s:m60.n61;m=192.168.1.146>
P-Access-Network-Info:b=21 (the station location marker information of new base station)
Event:handover-num (request group calling handover number)
Content-Length:0
5.?OK
The new switch of * * * * * * * * * * * * * * * *-group calling controller * * * * * * * * * * * * * * * * * * * * *
200
Via:m60.n61;4
From:<p:2000001>;tag=1236
To:<g:5000>;tag=8846
Call-ID:123ABCDE
Handover-Number:q:44 (group calling handover number)
Cseq:1?PREPARE
Content-Length:0
6.INVITE
* * * * * * * * * * * * * * * * group calling controller-new switch * * * * * * * * * * * * * * * * * * * * *
INVITE?s:m50.n61
Via:m60.n61;7
Max-Forwards:70
From:<p:2000000>;tag=1235
To:<q:44>;t=g:5000;a=p:2000001
Call-ID:123ABCDE
Cseq:1
Contact:<s:m60.n61;m=192.168.1.146>
Content-Type:sdp
Content-Length:68
O=192.168.2.146 (following is media information)
a=recvonly
m=6000
7.OK
The new switch of * * * * * * * * * * * * * * * *-group calling controller * * * * * * * * * * * * * * * * * * * * *
200
Via:m60.n61;7
From:<p:2000000>;tag=1235
To:<q:44>;tag=7452
Call-ID:123ABCDE
Cseq:1?INVITE
P-Access-Network-Info:c=201.1-1 (new service in base station channel information)
Content-Type:sdp
Content-Length:68
O=192.168.2.145 (following is media information)
m=5000
a=sendonly
8.ACK
* * * * * * * * * * * * * * * * group calling controller-new switch * * * * * * * * * * * * * * * * * * * * *
ACK?s:m50.n61
Via:m60.n61;7
Max-Forwards:70
From:<p:2000000>;tag=1235
To:<q:44>;tag=7452
Call-ID:123ABCDE
Cseq:1
Content-Length:0
9.OK
* * * * * * * * * * * * * * * * group calling controller-former switch * * * * * * * * * * * * * * * * * * * * *
200
Via:m40.n61;3
From:<p:2000001>;tag=9893
To:<g:5000>;tag=1235
Call-ID:123ABCDE
Cseq:1?PREPARE
P-Access-Network-Info:c=201.1-1 (new service in base station channel information)
Content-Length:0
10.UPDATE
The former switch of * * * * * * * * * * * * * * * *-group calling controller * * * * * * * * * * * * * * * * * * * * *
UPDATE?s:m60.n61
Via:m40.n61;13
Max-Forwards:70
From:<p:2000001>;tag=9893
To:tag=1235
Call-ID:123ABCDE
Cseq:1
Content-Type:media-inversion (revising the voice flow direction)
Content-Length:68
T=name:m50.n61; Lai:21 (talker's information)
11.?UPDATE
* * * * * * * * * * * * * * * * group calling controller-new switch * * * * * * * * * * * * * * * * * * * * *
UPDATE?s:m50.n61
Via:m60.n61;14
Max-Forwards:70
From:<p:2000001>;tag=1235
To:tag=7452
Call-ID:123ABCDE
Cseq:1
Content-Type:media-inversion (revising the voice flow direction)
Content-Length:68
T=lai:21 (talker's information)
12.OK
* * * * * * * * * * * * * * * * group calling controller-former switch * * * * * * * * * * * * * * * * * * * * *
200
Via:m40.n61;13
From:<p:2000001>;tag=9893
To:tag=1235
Call-ID:123ABCDE
Cseq:1?UPDATE
Content-Length:0
13.?OK
The new switch of * * * * * * * * * * * * * * * *-group calling controller * * * * * * * * * * * * * * * * * * * * *
200
Via:m60.n61;14
From:<p:2000001>;tag=1235
To:tag=7452
Call-ID:123ABCDE
Cseq:1?UPDATE
Content-Length:0
The present invention does not relate to all identical with the prior art prior art that maybe can adopt of part and realizes.
Claims (1)
1. cluster switch-spanning notice-type group call method of handover based on SIP is characterized in that:
Before realizing switch-spanning notice-type group call handover, earlier Session Initiation Protocol is revised as follows:
1. increase the PREPARE method, be used to apply for the notice-type group call handover of inter-exchange;
2. expand the purposes of INVITE, make it to be applicable in the group system and to call out group calling handover number;
3. increase header field field Handover-Number and P-Access-Network-Info, wherein Handover-Number is used to carry group calling handover number, and P-Access-Network-Info is used to carry the station location marker information or the traffic channel information of base station;
4. increase the header field value, Event header field value handover-num representes to ask group calling handover number, To header field value q:30 to represent group calling handover numbers 30, and Content-Type header field value media-inversion representes to revise the direction of voice flow;
5. increase the header field parameter, To header field parametric t=g:5000 representes that sets of numbers 5000, a=p:2000001 represent the travelling carriage number 2000001 in district more, media parameter t=name:m50.n61; Lai:21 representes to send the switch and the base station of voice;
Be in the travelling carriage of calling talk, select the better new base station of a communication condition automatically, use air interface signaling, initiate the notice-type group call handover, carried the station location marker information of new base station in the air interface signaling to former base station; To company switch initiation notice-type group call handover, switch judges that new base station is connected another switch, at this moment according to the station location marker information of new base station through interior signaling in former base station
Former switch sends SIP method PREPARE and gives the group calling controller, and through the group calling controller, to new switch request notice-type group call handover;
Participated in this group calling like new switch, then the group calling controller uses the traffic channel information of PREPARE after new switch request travelling carriage is handed over to new base station, and new switch carries traffic channel information in response OK;
Do not participate in this group calling like new switch; Then the group calling controller uses earlier PREPARE to new switch request group calling handover number; Use SIP method INVITE to call out this group calling handover number then; Set up communication link with new switch, and obtain the traffic channel information that new base station assigns is given the handover travelling carriage;
The group calling controller carries traffic channel information in giving the response OK of former switch;
If the travelling carriage of handover is sending voice, former switch then need use SIP method UPDATE to change the voice flow direction between clustering switch;
Former switch is after receiving the response OK of group calling controller; The traffic channel information that carries is issued the base station through interior signaling; The base station sends to travelling carriage through air interface signaling; Travelling carriage switches to new service in base station channel and converses, and realizes the cluster switch-spanning notice-type group call handover based on SIP.
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| CN113411758B (en) * | 2020-03-16 | 2022-08-09 | 成都鼎桥通信技术有限公司 | Method and device for determining group call key event of private network cluster terminal |
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