CN101577953A - Soft handover method and system in trunking communication - Google Patents
Soft handover method and system in trunking communication Download PDFInfo
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- CN101577953A CN101577953A CN 200910108005 CN200910108005A CN101577953A CN 101577953 A CN101577953 A CN 101577953A CN 200910108005 CN200910108005 CN 200910108005 CN 200910108005 A CN200910108005 A CN 200910108005A CN 101577953 A CN101577953 A CN 101577953A
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Abstract
The invention discloses a soft handover method and system in trunking communication. The method includes the following steps: a trunking dispatch server receives a cross base station handover request from a handover source base station, a handover destination base station is instructed to establish cell resource according to the cross base station handover request and informs the handover source base station after completing the establishment of the cell resource; the trunking dispatch server receives reverse service frames from the handover source base station and the handover destination base station, if the reverse service frames comprise the same reverse service frames, the first arrival therein is selected; and the trunking dispatch server sends a forward service frame to the handover source base station and the handover destination base station. The system comprises a notice receiving module, a frame selecting module and a forwarding module arranged on the trunking dispatch server. The invention realizes soft handover between different base station controllers in the trunking communication.
Description
Technical field
The present invention relates to trunked communication system, specifically, relate to soft handover method and system in a kind of trunking communication.
Background technology
Trunked communication system based on mobile communication is that cellular telecommunication art and specific schedule communication system are combined, and adopts the communication system of half-duplex operation mode, can realize continuing fast, supports group call (being the method for calling of one-to-many).Such trunked communication system can be widely used in the departments of commanding, scheduling feature is had relatively high expectations such as enterprises and institutions, public security, police and army.
Group call is a service feature important in the group system, method by reverse traffic channel before under the sector, sharing, support to the group call of big capacity group among a small circle (group can comprise hundreds of user terminal, and these user terminals all are positioned under among a small circle the sector) is provided.Allow interior all users of single user and group to converse simultaneously, user in the group, except speaking, other people must listen to.
The resource of group system is set up mode: by setting up shared resource by the sub-district, guarantee that all users under the same sub-district can be linked into identical channel resource.Under identical base station controller (BSC), owing to be to use same selection Dispatching Unit (SDM), terminal can realize soft handover between different districts by current mechanism.But for different BSC,, can't realize soft handover between different districts owing to be not the resource of setting up according to terminal, but by terminal according to neighboring BS information, independently carry out direct-cut operation.
But owing to be direct-cut operation, therefore on success rate and reliability, to be lower than soft handover, the overlapping area between different BSC particularly, the problems referred to above are more obvious.
Summary of the invention
Because above-mentioned background the invention provides soft handover method and system in a kind of trunking communication, can realize the soft handover between different BSC.
In order to realize above-mentioned technical problem, the present invention has adopted following technical scheme:
Soft handover method in a kind of trunking communication comprises the steps:
A, trunking dispatch server receive from handover source base station stride the base station handoff request, stride base station handoff request indication and switch the purpose base station and set up local resource according to described, and described local resource set up finish after, notify described handover source base station;
B, trunking dispatch server receive from handover source base station and switch the reverse traffic frame of purpose base station, if comprise identical reverse traffic frame in the described reverse traffic frame, then select the first arrival in the identical reverse traffic frame;
C, trunking dispatch server send the forward business frame to handover source base station and switching purpose base station.
In a kind of embodiment of above-mentioned soft handover method, among the described step B, whether the frame flag of trunking dispatch server by the reverse traffic frame identical judges whether to comprise identical reverse traffic frame.
In a kind of embodiment of above-mentioned soft handover method, described frame flag is the frame number of reverse traffic frame.
In a kind of embodiment of above-mentioned soft handover method, also comprise: mark is carried out to the reverse traffic frame in terminal or base station, and wherein, identical reverse traffic frame has identical frame flag.
In a kind of embodiment of above-mentioned soft handover method, described trunking communication is the CDMA standard.
The invention also discloses the soft switching system in a kind of trunking communication, comprise the reception notification module, frame selection module, the forwarding module that are arranged on the trunking dispatch server; Wherein,
Described reception notification module, be used to receive from handover source base station stride the base station handoff request, stride base station handoff request indication and switch the purpose base station and set up local resource according to described, and described local resource set up finish after, notify described handover source base station;
Described frame is selected module, is used to receive the reverse traffic frame from handover source base station and switching purpose base station, if comprise identical reverse traffic frame in the described reverse traffic frame, then selects the first arrival in the identical reverse traffic frame;
Described forwarding module sends the forward business frame to handover source base station and switching purpose base station.
The present invention is by the setting of trunking dispatch server, and by the handoff request of trunking dispatch server according to source base station, corresponding local resource is set up in indication purpose base station.Then, terminal can send the reverse traffic frame to source base station and purpose base station simultaneously, trunking dispatch server is receiving the reverse traffic frame that transmit source base station and purpose base station, can implement frame to identical reverse traffic frame and select, and transmit the preceding paragraph traffic frame to source base station and purpose base station.Such soft handoff has realized the soft handover between the different B SC, does not need directly interconnected between source base station and the purpose base station, has reduced the complexity of system.
Description of drawings
The description that Fig. 1 is exemplary the structure of soft handover network element of the present invention;
The description that Fig. 2 is exemplary the handling process of soft handover of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
As shown in Figure 1, in an embodiment of the present invention, the related network element of soft handover comprises colony terminal, base station (base station controller), trunking dispatch server.Be without loss of generality, suppose that soft handover carries out between base station 1 and base station 2, and the source base station of base station 1 for switching, the purpose base station of base station 2 for switching.On base station 1 and base station 2, be respectively arranged with cluster client end 1 and cluster client end 2, by cluster client end 1 and cluster client end 2, base station 1 and base station 2 realize finishing the soft handover function alternately with trunking dispatch server.
For trunking dispatch server, it can comprise (not shown) reception notification module, frame selection module, forwarding module; Wherein,
The reception notification module, be used to receive from handover source base station stride the base station handoff request, stride base station handoff request indication and switch the purpose base station and set up local resource according to described, and described local resource set up finish after, notify described handover source base station;
Frame is selected module, is used to receive the reverse traffic frame from handover source base station and switching purpose base station, if comprise identical reverse traffic frame in the described reverse traffic frame, then selects the first arrival in the identical reverse traffic frame;
Forwarding module sends the forward business frame to handover source base station and switching purpose base station.
In one embodiment of the invention, frame selects that the frame flag of module by the reverse traffic frame be whether identical to judge whether to comprise identical reverse traffic frame.The setting of frame flag can judge fast whether the reverse traffic frame is identical.Because in soft switching process, terminal will send the reverse traffic frame to a plurality of base stations simultaneously, the reverse traffic frame that then receive it a plurality of base stations is transmitted to trunking dispatch server, thereby, trunking dispatch server may be received the reverse traffic frame of identical content; the setting of frame flag, and whether a plurality of reverse traffic frames that make trunking dispatch server to judge fast to receive are identical.The frame flag operation can be undertaken by the frame flag module that is arranged on terminal or the base station, and identical reverse traffic frame has identical frame flag, and frame flag can be the frame number of reverse traffic frame.Also promptly, the traffic frame of the identical content that sends for terminal, no matter it is sent by source base station or purpose base station, it all has identical frame number, frame number can calculate according to system time.
The description that Fig. 2 is exemplary soft handover handling process of the present invention, trunking dispatch server is in group call establishment process, can be by carrying carrier frequency information, F0 frame biasing information such as (frame that is used in the time slot send choose opportunities), inform that the base station sets up local resource, guarantee that the border cell between each base station can carry out soft handover.
As shown in Figure 2, the handling process of the soft handover of the embodiment of the invention specifically comprises:
In step 201, suppose that a certain colony terminal is positioned under the sub-district of base station 1, be in the conversation, at this moment, the reverse traffic frame of this terminal sends to trunking dispatch server by base station 1, and the frame number of reverse traffic frame is filled in by terminal or base station 1.For example, fill in frame number by terminal according to the current time, also can guarantee the base station time accurately under the situation, (channel board or SDM) fills in frame number by the base station.
At step 202-205, terminal has been moved to 2 neighbor cell edges, base station, receives the district pilots of base station 2 at forward traffic channel, knows and can carry out soft handover to the sub-district of this base station 2 by the district pilots information of this base station 2.1 initiate handoff request in the base station subsequently.Base station 1 finds that this sub-district is the sub-district of base station 2, initiates handoff request (striding the base station handoff request) to trunking dispatch server subsequently, and the resource of this sub-district is set up in trunking dispatch server indication base station 2, and resource set up finish after informing base station 1.
In step 206, base station 1 sends the channels of neighboring areas switch indicating information to terminal after receiving that base station 2 local resources are set up the notice of finishing, and terminal adds this sub-district.
At step 207-209, terminal sends the reverse traffic frame to two sub-districts that are under base station 1 and the base station 2 simultaneously, after trunking dispatch server is carried out the frame selection, send the forward business frame simultaneously for two base stations, terminal receives the forward business frame of two sub-districts simultaneously and carries out frame and select, and reaches the purpose of soft handover.
It should be noted that the above-mentioned steps numbering only is used for identifying and distinguishing each step, must not represent the sequencing of each step, execution sequence between each step is judged according to the internal logic of each step, therefore, can see that step 208 and step 209 are to carry out simultaneously.In addition, because terminal sends reverse traffic frame existing associated description in step 201 to base station 1, therefore, in the step 207 shown in Fig. 2, it is not shown in Figure 2 that terminal base station 1 sends this process of reverse traffic frame.
Frame for trunking dispatch server is selected, and it mainly is that the correct frame of selecting to arrive is at first transmitted when receiving the multichannel traffic frame of a plurality of base stations transmission.In real process, because terminal sends the reverse traffic frame to a plurality of base stations simultaneously, and a plurality of base stations are transmitted to trunking dispatch server with these reverse traffic frames, therefore, trunking dispatch server might be subjected to the reverse traffic frame of identical content, thereby, need carry out frame to the traffic frame of these identical contents and select, and use the mode of selecting to transmit the arrival at first in the identical reverse traffic frame in the present embodiment.On the other hand, relatively poor and when not transmitting the reverse traffic frame to trunking dispatch server, trunking dispatch server can obtain the reverse traffic frame that this is not transmitted from other base station when a certain signal of base station occurring.
What in an embodiment of the present invention, trunking communication was adopted is code division multiple access (CDMA, CodeDivision Multiple Access) standard.
Compared with prior art, the present invention finishes frame by trunking dispatch server and selects, and makes group service also can provide the soft handover function between BSC, thereby has improved the flexibility of system design and networking.When the user was switched between BSC, even the BSC dtr signal is wherein arranged, other road traffic frames also can guarantee the voice quality of terminal, and call drop can not take place, and have improved the reliability of system.Do not need the directly interconnected of two base stations, reduced the complexity of system.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, but this example of just lifting for ease of understanding should not think that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can make various possible being equal to and change or replacement, these changes or replacement all should belong to protection scope of the present invention.
Claims (10)
1. the soft handover method in the trunking communication is characterized in that, comprises the steps:
A, trunking dispatch server receive from handover source base station stride the base station handoff request, stride base station handoff request indication and switch the purpose base station and set up local resource according to described, and described local resource set up finish after, notify described handover source base station;
B, trunking dispatch server receive from handover source base station and switch the reverse traffic frame of purpose base station, if comprise identical reverse traffic frame in the described reverse traffic frame, then select the first arrival in the identical reverse traffic frame;
C, trunking dispatch server send the forward business frame to handover source base station and switching purpose base station.
2. soft handover method as claimed in claim 1 is characterized in that, among the described step B, whether the frame flag of trunking dispatch server by the reverse traffic frame identical judges whether to comprise identical reverse traffic frame.
3. soft handover method as claimed in claim 2 is characterized in that, described frame flag is the frame number of reverse traffic frame.
4. as claim 2 or 3 described soft handover methods, it is characterized in that also comprise: mark is carried out to the reverse traffic frame in terminal or base station, wherein, identical reverse traffic frame has identical frame flag.
5. soft handover method as claimed in claim 1 is characterized in that, described trunking communication is the CDMA standard.
6. the soft switching system in the trunking communication is characterized in that, comprises that the reception notification module, the frame that are arranged on the trunking dispatch server select module, forwarding module; Wherein,
Described reception notification module, be used to receive from handover source base station stride the base station handoff request, stride base station handoff request indication and switch the purpose base station and set up local resource according to described, and described local resource set up finish after, notify described handover source base station;
Described frame is selected module, is used to receive the reverse traffic frame from handover source base station and switching purpose base station, if comprise identical reverse traffic frame in the described reverse traffic frame, then selects the first arrival in the identical reverse traffic frame;
Described forwarding module sends the forward business frame to handover source base station and switching purpose base station.
7. soft switching system as claimed in claim 6 is characterized in that, described frame is selected module to be whether frame flag by the reverse traffic frame is identical and judged whether to comprise identical reverse traffic frame.
8. soft switching system as claimed in claim 7 is characterized in that, described frame flag is the frame number of reverse traffic frame.
9. as claim 7 or 8 described soft switching systems, it is characterized in that, also comprise: be arranged at the frame flag module on terminal or the base station, described frame flag module is used for the reverse traffic frame is carried out mark, wherein, identical reverse traffic frame has identical frame flag.
10. soft switching system as claimed in claim 6 is characterized in that, described trunking communication is the CDMA standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200910108005 CN101577953B (en) | 2009-06-09 | 2009-06-09 | Soft handover method and system in trunking communication |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910108005 CN101577953B (en) | 2009-06-09 | 2009-06-09 | Soft handover method and system in trunking communication |
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| CN101577953A true CN101577953A (en) | 2009-11-11 |
| CN101577953B CN101577953B (en) | 2013-01-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790213A (en) * | 2009-12-30 | 2010-07-28 | 中兴通讯股份有限公司 | Soft-switching residential area assigning method and BSC (base station controller) for trunking communication system |
| WO2012071845A1 (en) * | 2010-12-01 | 2012-06-07 | 中兴通讯股份有限公司 | Method and system for realizing integrality protection |
| CN104301954A (en) * | 2013-07-17 | 2015-01-21 | 中兴通讯股份有限公司 | Switching method, device, base stations and system |
| CN109842639A (en) * | 2017-11-24 | 2019-06-04 | 华为技术有限公司 | Realize method, equipment and the system of business continuance in handoff procedure |
| WO2020034064A1 (en) * | 2018-08-13 | 2020-02-20 | 海能达通信股份有限公司 | Handover method and device, multimode terminal, and broadband base station |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100527655C (en) * | 2003-06-09 | 2009-08-12 | 华为技术有限公司 | A method for implementing cluster service in CDMA system |
| CN1314296C (en) * | 2004-06-12 | 2007-05-02 | 中兴通讯股份有限公司 | Method for realizing hard changing-over in CDMA cluster system |
| CN100438686C (en) * | 2004-08-02 | 2008-11-26 | 华为技术有限公司 | Cross district switching method for colony mobile station |
| CN101137227B (en) * | 2007-06-18 | 2010-06-23 | 中兴通讯股份有限公司 | Hard handoff method in digital cluster system |
-
2009
- 2009-06-09 CN CN 200910108005 patent/CN101577953B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790213A (en) * | 2009-12-30 | 2010-07-28 | 中兴通讯股份有限公司 | Soft-switching residential area assigning method and BSC (base station controller) for trunking communication system |
| WO2011079665A1 (en) * | 2009-12-30 | 2011-07-07 | 中兴通讯股份有限公司 | Method and base station controller for soft handover cell assignment in group communication system |
| CN101790213B (en) * | 2009-12-30 | 2014-09-10 | 中兴通讯股份有限公司 | Soft-switching residential area assigning method and BSC (base station controller) for trunking communication system |
| WO2012071845A1 (en) * | 2010-12-01 | 2012-06-07 | 中兴通讯股份有限公司 | Method and system for realizing integrality protection |
| CN104301954A (en) * | 2013-07-17 | 2015-01-21 | 中兴通讯股份有限公司 | Switching method, device, base stations and system |
| CN109842639A (en) * | 2017-11-24 | 2019-06-04 | 华为技术有限公司 | Realize method, equipment and the system of business continuance in handoff procedure |
| CN109842639B (en) * | 2017-11-24 | 2020-09-08 | 华为技术有限公司 | Method, equipment and system for realizing service continuity in switching process |
| WO2020034064A1 (en) * | 2018-08-13 | 2020-02-20 | 海能达通信股份有限公司 | Handover method and device, multimode terminal, and broadband base station |
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| CN101577953B (en) | 2013-01-16 |
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Granted publication date: 20130116 Termination date: 20170609 |