CN1154377C - Seamless talking switching system and method for global radio mobile communication system - Google Patents
Seamless talking switching system and method for global radio mobile communication system Download PDFInfo
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- CN1154377C CN1154377C CNB011134267A CN01113426A CN1154377C CN 1154377 C CN1154377 C CN 1154377C CN B011134267 A CNB011134267 A CN B011134267A CN 01113426 A CN01113426 A CN 01113426A CN 1154377 C CN1154377 C CN 1154377C
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Abstract
The present invention relates to a seamless talking switching system and a method thereof for a global wireless mobile communication system. The system is characterized in that when a request is switched, a second link is established at the time of keeping a call of a first link; the first link stops when the data of the second link is successfully exchanged in two directions. Thus, the system causes interruption during switch to be small, enhances service quality and ensures the speech quality in the process of switch.
Description
Technical field
The present invention relates to the system and the method thereof of conversation seamless switching in a kind of global radio mobile communication system.
Background technology
In the GSM digital mobile communication system, because the mobility of travelling carriage (mobile phone), exist a large amount of switchings, can be divided in switching between the MSC (mobile switching centre), the MSC switching between the sub-district in the switching between the BTS (base station) and BTS in the switching between the BSC (base station controller), the BSC.Be to carry out switching by the following method at present: at first set up second Radio Link at cellular network, on first Radio Link, send switching command then and start switching to travelling carriage, call out temporary transient the termination afterwards, up to utilizing second Radio Link to set up new link success.
Existing switching is to adopt to disconnect the rules of switching again earlier, to switch to example between BTS in the BSC, as shown in Figure 1.Just (C1's travelling carriage (MS)) converses with link A in the sub-district, simultaneously constantly measurement report is reported BSC by the base station X that sub-district C1 is positioned at, when MS is moved to the sub-district of base station Y (C2) by sub-district (C1), reach when triggering the condition of switching, BSC determines that according to measurement report Target cell (C2) back issues the activation command of channel B to base station Y, after base station Y activates channel B, report activation to finish message to BSC, BSC issues switching command by base station X to MS then, this moment MS disconnecting link A, turn to channel B, set up MS, link B between base station Y and the BSC, MS by base station Y after BSC reports handoff completion message, BSC begins down voice information is sent by link B, receive the up speech on the link B, and base station X issues channel A release command, release link A.If go wrong in handoff procedure, MS will return back to link A, handoff failure.
From above-described whole handoff procedure as can be seen, because channel A and channel B's is different, MS must at first disconnect and being connected of link A, and just can connect with link B, normally can cause speech to interrupt at disconnecting link A therebetween to forwarding link B communication to, cause interrupted sense.
Summary of the invention
The objective of the invention is problem for the service quality reduction that overcomes existence in existing the switching, and a kind of gsm system seamless handover method of when switching, guaranteeing the speech transmissions quality that provides.Make in cellular network, when a calling when first Radio Link is transformed into second Radio Link, do not interrupt ongoing service, can maximum possible reduce the interrupting time when switching, guarantee transmission quality.
In order to realize purpose of the present invention, the technical solution used in the present invention is:
A kind of method that realizes conversation seamless switching in the global radio mobile communication system is characterized in, when handoff request, sets up second link when keeping first link call; When the data of second link when both direction successfully exchanges, stop first link; May further comprise the steps:
An idle wireless channel is selected in a, the base station of at first being got in touch by the adapter conversation;
B, be based upon link between this idle channel of communication network and base station then;
C notifies travelling carriage by switching command with idle channel;
D, two all normally transmitting-receivings of talking link simultaneously;
E, communication network side issue downlink information simultaneously by two links and idle channel link, switch descending not staccato to realize travelling carriage; Simultaneously select wherein that the information of a link is sent to corresponding travelling carriage by another talking link, switch up not staccato to realize travelling carriage according to the up information content.
Above-mentioned a kind of method that realizes conversation seamless switching in the global radio mobile communication system, wherein, the described communication network side of step e is meant downlink information by the method that two links and idle channel link issue simultaneously: the communication network side at idle channel link link activation to the travelling carriage successful switch to the idle channel link or during handoff failure returns former talking link, both be sent to the idle channel link with calling out the downlink information of sending here the opposite end, be sent to former talking link again, switch descending not staccato to realize travelling carriage.
Above-mentioned a kind of method that realizes conversation seamless switching in the global radio mobile communication system, wherein, described seamless switching also comprises the wireless link from a sub-district to another sub-district travelling carriage.
Above-mentioned a kind of method that realizes conversation seamless switching in the global radio mobile communication system, wherein, a described sub-district can be determined by the distance between measuring-signal field intensity, signal to noise ratio, base station and the travelling carriage to the generation that another sub-district travelling carriage switches, if detect a kind of switch instances, so not only Radio Link must be transferred to the base station of taking over by the base station, and communication network one side and will surrender transmission between the base station of writing to each other and also will switch to the base station of taking over conversation.
Because the present invention has adopted above technical scheme, utilize two-way link symbiont techn, downlink information copy transmission technology and uplink information selection technology, between travelling carriage and cellular network, set up two duplex wireless links, when handoff request, keep the calling of first link to set up second link simultaneously.Only in the data of second link when both direction successfully exchanges, just stop first link.Therefore make intermittently little between transfer period, service quality promotes.
Description of drawings
Specific performance of the present invention, feature are further provided by following embodiment and accompanying drawing thereof.
Fig. 1 is a prior art handoff technique schematic diagram.
Fig. 2 realizes the systematic schematic diagram of the technology of the present invention.
In cellular network, do not interrupt ongoing service, a calling is transformed into second Radio Link from first Radio Link, and the switching that does not cause service quality to reduce is called " seamless switching ".In order to carry out seamless switching, get two duplex wireless links that remain on simultaneously between travelling carriage and the cellular network.When handoff request, keep the calling of first link to set up second link simultaneously.Only in the data of second link when both direction successfully exchanges, just stop first link.
In a kind of global radio mobile communication of the present invention system seamless switching method of call based on system, comprise that two are linking the two-way call link of calling and the wireless channel link of a free time; Described two two-way call links that linking calling comprise: a mobile switching centre, two base station controllers that link with this mobile switching centre respectively, two base stations that link with corresponding base station controller separately respectively, and two subscriber terminal equipments that link with relevant base station separately respectively; The wireless channel link of a described free time comprises another base station controller and another base station, this another base station controller links with mobile switching centre, another base station links with another base station controller, a subscriber terminal equipment and another base station chaining form the wireless channel link of a free time.
See also accompanying drawing 2.This is the embodiment that the present invention uses at cellular system, comprises mobile switching centre 10, base station controller 11,12 and 17, base station 13,14 and 18, and subscriber terminal equipment (travelling carriage) 15 and 16.Wherein travelling carriage 15 and 16 is the both sides that communicating by letter, and A, B, C and D, E, F are the two-way call links that is linking calling.In case travelling carriage 15 leaves the service area of the sub-district at its place, must take over so that guarantee wireless link with travelling carriage by another sub-district, the generation of this switching can be determined by distance between measuring-signal field intensity, signal to noise ratio, base station and the travelling carriage or the like, if detect a kind of switch instances, so not only Radio Link must be transferred to the base station 18 of taking over by base station 13, and communication network one side and will surrender transmission between the base station 13 of writing to each other and also will switch to the base station 18 of taking over conversation.
The present invention keeps the calling of first link to set up second link simultaneously when handoff request.Only in the data of second link when both direction successfully exchanges, just stop first link.
May further comprise the steps: at first select an idle wireless channel by the base station 18 of taking over the conversation contact, be based upon the link GHI between this idle channel of communication network and base station 18 then, again by switching command with this channel notification travelling carriage, the all normally transmitting-receivings of two links this moment, communication network issues downlink information simultaneously by two link ABC and GHI, and the information of a link is sent to corresponding travelling carriage 16 by link DEF and select wherein according to the up information content.The communication network side at the GHI link activation to travelling carriage 15 successful switch to the GHI link or during handoff failure returns former link ABC, to call out the downlink information of sending here opposite end (travelling carriage 16) and both be sent to link GHI, be sent to link ABC again, can realize that travelling carriage switches descending not staccato.Select one to be sent to link DEF the uplink information of travelling carriage 15 simultaneously and give travelling carriage 16, can realize that travelling carriage switches up not staccato.
Utilization of the present invention shifts to an earlier date technology (promptly when mobile phone forwards new channel to the opportunity of arranging net, begin two links and receive and dispatch speech information simultaneously), two link symbiont techns, downlink informations copy transmission technology and uplink information selections technology, the interrupting time when can maximum possible reducing switching.
Descending two-way link among the present invention is through using in the GSM project, and the down voice interrupting time will shorten to 20～40 milliseconds by about 200 milliseconds original (if handoff failure will be bigger intermittently), and actual motion proves that this scheme is reliably feasible.
Claims (4)
1, a kind of method that realizes conversation seamless switching in the global radio mobile communication system is characterized in that, when handoff request, sets up second link when keeping first link call; When the data of second link when both direction successfully exchanges, stop first link; May further comprise the steps:
An idle wireless channel is selected in a, the base station of at first being got in touch by the adapter conversation;
B, be based upon link between this idle channel of communication network and base station then;
C notifies travelling carriage by switching command with idle channel;
D, two all normally transmitting-receivings of talking link simultaneously;
E, communication network side issue downlink information simultaneously by two links and idle channel link, switch descending not staccato to realize travelling carriage; Simultaneously select wherein that the information of a link is sent to corresponding travelling carriage by another talking link, switch up not staccato to realize travelling carriage according to the up information content.
2, a kind of method that realizes conversation seamless switching in the global radio mobile communication system according to claim 1, it is characterized in that, the described communication network side of step e is meant downlink information by the method that two links and idle channel link issue simultaneously: the communication network side at idle channel link link activation to the travelling carriage successful switch to the idle channel link or during handoff failure returns former talking link, both be sent to the idle channel link with calling out the downlink information of sending here the opposite end, be sent to former talking link again, switch descending not staccato to realize travelling carriage.
3, a kind of method that realizes conversation seamless switching in the global radio mobile communication system according to claim 1 is characterized in that described seamless switching also comprises the wireless link from a sub-district to another sub-district travelling carriage.
4, a kind of method that realizes conversation seamless switching in the global radio mobile communication system according to claim 1, it is characterized in that, a described sub-district can be determined by the distance between measuring-signal field intensity, signal to noise ratio, base station and the travelling carriage to the generation that another sub-district travelling carriage switches, if detect a kind of switch instances, so not only Radio Link must be transferred to the base station of taking over by the base station, and communication network one side and will surrender transmission between the base station of writing to each other and also will switch to the base station of taking over conversation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011134267A CN1154377C (en) | 2001-06-13 | 2001-06-13 | Seamless talking switching system and method for global radio mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011134267A CN1154377C (en) | 2001-06-13 | 2001-06-13 | Seamless talking switching system and method for global radio mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1391407A CN1391407A (en) | 2003-01-15 |
| CN1154377C true CN1154377C (en) | 2004-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011134267A Expired - Lifetime CN1154377C (en) | 2001-06-13 | 2001-06-13 | Seamless talking switching system and method for global radio mobile communication system |
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| CN (1) | CN1154377C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101321381B (en) * | 2007-06-04 | 2012-11-07 | 华为技术有限公司 | Hard handover method, system and mobile station |
| CN101860991B (en) * | 2009-04-13 | 2014-11-19 | 上海中兴软件有限责任公司 | Method for mutually switching local exchange chain and non-local exchange chain |
| US8391904B2 (en) * | 2009-05-10 | 2013-03-05 | Qualcomm Incorporated | Method and apparatus for maintaining quality of service during regulatory domain change |
| CN102238662B (en) * | 2010-04-30 | 2015-12-16 | 中兴通讯股份有限公司 | A kind of method and system and base station sub-system realizing switching in local exchange |
| CN102238661B (en) * | 2010-04-30 | 2015-06-03 | 中兴通讯股份有限公司 | Switching system and method during local switch |
| WO2016023165A1 (en) * | 2014-08-12 | 2016-02-18 | Qualcomm Incorporated | Holding a call setup request during a location change procedure |
| WO2016095115A1 (en) * | 2014-12-17 | 2016-06-23 | Qualcomm Incorporated | Handover using dual active connections |
| CN107517487B (en) * | 2017-07-17 | 2020-03-31 | 努比亚技术有限公司 | Call control method and mobile terminal |
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2001
- 2001-06-13 CN CNB011134267A patent/CN1154377C/en not_active Expired - Lifetime
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| CN1391407A (en) | 2003-01-15 |
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