CN1671225A - Method for judging broken link of Link Access Procedure on D-channel (LAPD) - Google Patents
Method for judging broken link of Link Access Procedure on D-channel (LAPD) Download PDFInfo
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- CN1671225A CN1671225A CN 200410039807 CN200410039807A CN1671225A CN 1671225 A CN1671225 A CN 1671225A CN 200410039807 CN200410039807 CN 200410039807 CN 200410039807 A CN200410039807 A CN 200410039807A CN 1671225 A CN1671225 A CN 1671225A
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Abstract
A method for judging link drop of link access procedure in D channel, referring mobile communication field, to avoid frequently on/off of power amplifier resulting from frequently flash off in ABIS interface, prolong BTS RF service life, and greatly reduce frequently access and drop of mobile telephone set, which contains, A, real time counting data frame and link detection frame in link access procedure in D channel among current preset time, if there is no any data frame and link detection frame then judging the link drop, otherwise following step B, B, judging whether there is no management frame excessing rated value in D channel, if there is then judging the link drop, otherwise following step C, C, judging whether there is management frame excessing rated value during rated multiple time quantum, if there is then judging link drop.
Description
Technical field
The present invention relates to moving communicating field, be particularly related to base station controller (Base Station Controller, be called for short " BSC ") and base station transceiver (Base Transceiver Station, the control protocol of terrestrial links ABIS interface data link layer abbreviation " BTS ") (Link Access Procedure on the Dchannel is called for short " LAPD ") link judgment technology.
Background technology
Data link layer adopts common signal channel D to carry out signaling transmission control, is called the control protocol (Link Access Procedure on the D channel is called for short " LAPD ") of data link layer, with LAPB and LAP etc. X.25 be the subclass of HDLC-procedure; Transmit control and management information more than the 3rd layer by the D path at network and terminal room; And many logical data paths are set up in permission on the D path.
LAPD is the agreement of working on the data link layer of an Open System Interconnection (Open System Interconnection is called for short " OSI ") architecture.The purpose of LAPD is to use Abis interface between the three layer entity transmission information of D channel by BTS-BSC.LAPD and transmission bit rate are irrelevant, and it requires D channel full duplex, that bit is transparent.
The frame format of LAPD as shown in Figure 1; The state model of LAPD as shown in Figure 2.
LAPD has been applied in the standard of GSM (global system for mobile communications, Global System for mobileCommunication) 900 and DCS (Digital Cellular System Digital Cellular System) 1800.GSM900 and DCS1800 are Dual Band network, and they all are GSM standard.The function of two systems is identical, mainly is the frequency difference, and GSM900 is operated in 900MHZ, and DCS1800 is operated in 1800MHZ.The terrestrial links ABIS interface data link layer of regulation BSC and BTS adopts the LAPD agreement in the GSM900/DCS1800 standard.
The effect of LAPD link layer is to provide reliable and transfer of data safety to the upper strata, but transmission medium can not carry out the active data transmission under physical damage or strong jamming, for LAPD layer two, be the LAPD chain rupture to have occurred.The LAPD chain rupture is very big for the influence of BSS system, and specifically, the ABIS interface can not have normal transfer of data can cause BTS need close power amplifier.
This shows that correct decision LAPD chain rupture is very crucial technology to BSS system operate as normal.
Sometimes can dodge disconnected situation in LAPD, it is the chain rupture that is caused by paroxysmal interference that LAPD dodges disconnected.Q.921 chain rupture has associated description to agreement to LAPD, but this description can not effectively be handled LAPD and dodges disconnected.According to agreement Q.921, layer three is received LAPD_DL_REL_IND and the LAPD_DL_REL_CONF primitive message that the LAPD entity reports, and just thinks the LAPD chain rupture.The advantage of this discriminant approach is link-quality is quick on the draw, can be very fast the link-quality of identification LAPD, but also have some shortcomings.
In actual applications, there is following problem in such scheme: the differentiation of LAPD chain rupture is appropriate inadequately for the disconnected processing of the sudden strain of a muscle of ABIS interface physical transfer.
Cause the main cause of this situation to be, this criterion is dodged under the disconnected situation at LAPD can frequently report the LAPD chain rupture, report the LAPD link-recovery again after the disconnected recovery of this sudden strain of a muscle at once, since for BTS at LAPD chain rupture situation ShiShimonoseki power amplifier, behind the LAPD link-recovery, open power amplifier, therefore the disconnected frequent switch that can cause power amplifier of the frequent sudden strain of a muscle of ABIS interface is very big for the radio frequency life-span influence of BTS, and can cause the frequent online of mobile phone and fall net.Therefore differentiate in the differentiation of the ABIS of actual GSM mouth link inapplicable for the LAPD link in this agreement.
Summary of the invention
In view of this, main purpose of the present invention is to provide the determination methods of the Link Access Procedure chain rupture on a kind of D path, make the frequent sudden strain of a muscle of avoiding the ABIS interface break and cause the frequent switch of power amplifier, prolong the radio frequency life-span of BTS, meanwhile, reducing the mobile phone cause thus largely frequently surfs the Net and falls net.
For achieving the above object, the invention provides the Link Access Procedure chain rupture determination methods on a kind of D path, comprise following steps:
The A real-time statistics is in the previous predetermined amount of time, the Frame in the Link Access Procedure link on the D path, link detecting frame; If do not have any Frame and link detecting frame, then judge chain rupture, otherwise enter step B;
B judges in previous predetermined amount of time whether do not have the management frames that is used to connect of overrate in the Link Access Procedure link on the D path, if then judge chain rupture.
In addition, when the management frames that is used to connect of overrate is arranged in the Link Access Procedure link on the D path, carry out following steps in previous predetermined amount of time when in described step B, judging:
C judges whether the management frames that is used to connect of overrate is arranged in specified a plurality of predetermined amount of time, if then judge chain rupture.
Wherein, the Frame in the described steps A is the I frame.
Link detecting frame in the described steps A is the receive ready frame.
In the described steps A, a time period is 20 seconds.
Among the described step B, the management frames that is used to connect is the acknowledgement frame that Asynchronous Balanced Mode expansion frame and no count are set.
In step B, predetermined amount of time is 20 seconds, and the rated value of this moment is 4.
By relatively finding, technical scheme difference with the prior art of the present invention is, Frame in the real-time statistics LAPD link, link detecting frame and the management frames that is used to connect, and according to in a predetermined amount of time, the appearance situation of Frame or link detecting frame in the LAPD link, and in a predetermined amount of time, the appearance situation of the management frames that is used to connect, the link condition of judgement LAPD.
Difference on this technical scheme has brought comparatively significantly beneficial effect, promptly detects frame, Frame and management frames by statistics reception in a period of time, judges LAPD chain rupture situation more accurately.Thereby reduce the switching frequency of BTTS power amplifier, prolong the radio frequency life-span of BTS, meanwhile, the mobile phone of having avoided causing is thus frequently surfed the Net and is fallen net.
Description of drawings
Fig. 1 is the frame format schematic diagram of LAPD;
Fig. 2 is the state model schematic diagram of LAPD;
Fig. 3 is a LAPD multiframe link setup process schematic diagram;
Fig. 4 is when the LAPD chain rupture, and BSC is to the process schematic diagram of BTS active link setup;
Fig. 5 is a LAPD chain rupture determination methods schematic flow sheet according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The transmission of LAPD link point-to-point link data is carried out under multiframe link setup state.That is to say, when setting up link, need shake hands.Fig. 3 shows multiframe link setup process.
Need to prove that the multiframe link setup of the LAPD link of BSC and BTS in the present embodiment, is decided to be initiatively link setup of BSC approximately for the equal link setup initiatively of BSC and BTS.Those of ordinary skill in the art are understood that the present invention is equally applicable to the initiatively situation of link setup of BTS.
In the present embodiment, when the chain rupture of LAPD link, according to agreement Q.921, the active link setup that BSC need not stop, on link, show as BSC and Asynchronous Balanced Mode expansion (SetAsynchronous Balance Mode Extended is set to frequent transmission of BTS, abbreviation " SABME ") affirmation of frame and no count (Unmunbered Acknowledgement is called for short " UA ") frame.Wherein, SABME frame and UA frame can be referred to as the management frames that is used to connect.Fig. 4 illustrates when the LAPD chain rupture, and BSC is to the process of BTS active link setup.
This shows, when chain rupture takes place LAPD, two kinds of situations can take place.
At first, first kind of situation be in a period of time link without any Frame or mutual such as the link detecting frame of receive ready (Receive Ready is called for short " RR ") frame and so on.Wherein, Frame can be above-mentioned I frame or other frames.In the present embodiment, a period of time can be set and revise according to actual conditions.For example, 1 cycle is set at 20 seconds, continuous 3 cycles, if mutual without any Frame or link detecting frame in this time period, this can judge that chain rupture takes place LAPD as a time period.
Second kind of situation is that link has a large amount of management frames such as SABME frame and UA frame in a period of time.As mentioned above, after chain rupture takes place in LAPD, owing to BSC active link setup causes BSC frequently to send management frames to BTS.Therefore be used to the management frames that connects in a large number if having in a period of time, this can judge that chain rupture takes place LAPD.
Need to prove,, judge when also having Frame or link detecting frame in a period of time, can not judge utterly that still chain rupture does not take place LAPD when in first kind of situation.In this case, when in second kind of situation, the management frames that is used for link setup in a large number being arranged, can judge that then chain rupture takes place LAPD.Otherwise, judge that then chain rupture does not take place LAPD.
Hence one can see that, according to principle of the present invention, receives SABME frame and I frame number by statistics in a period of time and differentiate whether the LAPD chain rupture taking place.This is differentiated algorithm and is suitable for differentiation with ABIS interface LAPD Link State, has solved LAPD effectively and has dodged and disconnectedly systematically influence for BSS.Below in conjunction with Fig. 5, further specify according to above-mentioned principle and realize one embodiment of the present of invention.As shown in Figure 5, at first enter step 110, the Frame in the real-time statistics LAPD link, link detecting frame.Wherein, Frame can be I frame or other frames, and the link detecting frame can be RR frame or other frames.
After this enter step 120,, judge in a period of time, whether without any Frame or link detecting frame,, otherwise enter step 130 in the LAPD link if then be judged to chain rupture according to above-mentioned real-time statistics result.In the present embodiment, a time period can be with 20 seconds, also can be other values, specifically can set flexibly according to actual needs and revise.
In step 130, judge whether the management frames that is used to connect of overrate is arranged in a period of time, if then be judged to chain rupture.
In the present embodiment, the management frames that is used to connect can be SABME frame and AU frame.In addition, the time period can be consistent with the time period in the step 120, also can set a time period in addition, and rated value is set according to time period length.For example, when with 20 seconds be a real-time statistics cycle, 3 cycles are under the situation of a time period, rated value can be set at 4, when promptly the management frames number that receives when continuous 3 cycles surpasses 4, judges the LAPD chain rupture.In another embodiment of the present invention, when in step 130, judging in previous predetermined amount of time, when the management frames that is used to connect of overrate is arranged in the LAPD link, enter step 140: judge the management frames that is used to connect whether overrate is all arranged in specified a plurality of predetermined amount of time, if then judge chain rupture, otherwise judge link.For example, can 15 cycles be set to a time period, have that frequent sudden strain of a muscle is disconnected to be existed in these 15 continuous cycles, can think the LAPD chain rupture if the management frames that receives, then illustrates the LAPD link all above 1.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (8)
1. the Link Access Procedure chain rupture determination methods on the D path is characterized in that, comprises following steps:
The A real-time statistics is in the previous predetermined amount of time, the Frame in the Link Access Procedure link on the D path, link detecting frame; If do not have any described Frame and link detecting frame, then judge chain rupture, otherwise enter step B;
B judges in previous predetermined amount of time whether do not have the management frames that is used to connect of overrate in the Link Access Procedure link on the D path, if then judge chain rupture.
2. the Link Access Procedure chain rupture determination methods on the D path according to claim 1, it is characterized in that, when in described step B, judging in previous predetermined amount of time, when the management frames that is used to connect of overrate is arranged in the Link Access Procedure link on the D path, carry out following steps:
C judges whether the management frames that is used to connect of overrate is arranged in specified a plurality of predetermined amount of time, if then judge chain rupture.
3. the Link Access Procedure chain rupture determination methods on the D path according to claim 1 and 2 is characterized in that the Frame in the described steps A is the I frame.
4. the Link Access Procedure chain rupture determination methods on the D path according to claim 1 and 2 is characterized in that the link detecting frame in the described steps A is the receive ready frame.
5. the Link Access Procedure chain rupture determination methods on the D path according to claim 1 and 2 is characterized in that, among the described step B, the management frames that is used to connect is the acknowledgement frame that Asynchronous Balanced Mode expansion frame and no count are set.
6. the Link Access Procedure chain rupture determination methods on the D path according to claim 1 and 2 is characterized in that, among the described step B, described predetermined amount of time is 20 seconds.
7. the Link Access Procedure chain rupture determination methods on the D path according to claim 6 is characterized in that, in step B, described rated value is 4.
8. the Link Access Procedure chain rupture determination methods on the D path according to claim 2 is characterized in that, in step C, described predetermined amount of time is 20 seconds, and specified a plurality of predetermined amount of time are 15, and rated value is 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100398072A CN100426896C (en) | 2004-03-16 | 2004-03-16 | Method for judging broken link of Link Access Procedure on D-channel (LAPD) |
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| CNB2004100398072A CN100426896C (en) | 2004-03-16 | 2004-03-16 | Method for judging broken link of Link Access Procedure on D-channel (LAPD) |
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| CN1671225A true CN1671225A (en) | 2005-09-21 |
| CN100426896C CN100426896C (en) | 2008-10-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009082923A1 (en) * | 2007-12-14 | 2009-07-09 | Huawei Technologies Co., Ltd. | Link fault processing method and data forwarding device |
| CN101060655B (en) * | 2006-05-17 | 2010-12-08 | 华为技术有限公司 | Channel transmission limit method and its system |
| CN101237406B (en) * | 2008-02-29 | 2011-12-07 | 中兴通讯股份有限公司 | A realization method for D channel link access regulation |
| CN102404098A (en) * | 2010-09-14 | 2012-04-04 | 中兴通讯股份有限公司 | Method and device for transmitting uplink access procedure of D channel |
| CN101009582B (en) * | 2006-01-24 | 2012-05-09 | 电信科学技术仪表研究所 | Real-time online monitoring method and device based on the 2M data circuit transfer quality |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001186271A (en) * | 1999-12-22 | 2001-07-06 | Matsushita Electric Works Ltd | Communication monitor and communication monitoring system |
| KR20020015087A (en) * | 2000-08-21 | 2002-02-27 | 서평원 | Method for loopback test using specific pattern on LAPD chip |
| US20030179727A1 (en) * | 2002-03-21 | 2003-09-25 | Soong Anthony C.K. | Forward link supervision for packet data users in a wireless communication network |
| CN1278516C (en) * | 2002-05-27 | 2006-10-04 | 华为技术有限公司 | Treatment method of flash cut worning in network management system |
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- 2004-03-16 CN CNB2004100398072A patent/CN100426896C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101009582B (en) * | 2006-01-24 | 2012-05-09 | 电信科学技术仪表研究所 | Real-time online monitoring method and device based on the 2M data circuit transfer quality |
| CN101060655B (en) * | 2006-05-17 | 2010-12-08 | 华为技术有限公司 | Channel transmission limit method and its system |
| WO2009082923A1 (en) * | 2007-12-14 | 2009-07-09 | Huawei Technologies Co., Ltd. | Link fault processing method and data forwarding device |
| US8331222B2 (en) | 2007-12-14 | 2012-12-11 | Huawei Technologies Co., Ltd. | Link fault handling method and data forwarding apparatus |
| CN101237406B (en) * | 2008-02-29 | 2011-12-07 | 中兴通讯股份有限公司 | A realization method for D channel link access regulation |
| CN102404098A (en) * | 2010-09-14 | 2012-04-04 | 中兴通讯股份有限公司 | Method and device for transmitting uplink access procedure of D channel |
| CN102404098B (en) * | 2010-09-14 | 2015-01-07 | 中兴通讯股份有限公司 | Transmission method and transmission device of link access procedure of D channel |
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| CN100426896C (en) | 2008-10-15 |
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