CN101188529A - E1 loop detection method and device - Google Patents
E1 loop detection method and device Download PDFInfo
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- CN101188529A CN101188529A CNA2007101723760A CN200710172376A CN101188529A CN 101188529 A CN101188529 A CN 101188529A CN A2007101723760 A CNA2007101723760 A CN A2007101723760A CN 200710172376 A CN200710172376 A CN 200710172376A CN 101188529 A CN101188529 A CN 101188529A
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Abstract
The invention discloses an E1 loopback detection method which comprises the following steps that; a test pattern is generated and transmitted onto a line through a vacant position of the synchronized time slots of E1 frames; data packets from the line are received, if the data packets are the same with the test pattern, then a loopback is detected to be confirmed. In addition, the invention also discloses an E1 loopback detection device. The invention can find out quickly the positions and the causes of diversified faults caused by an E1 loopback and report the status of the loopback to an upper layer for handling, thus the time that transmitting engineers spend in testing for problems is saved dramatically and the problems can be solved in time.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method and device of E1 loopback detection.
Background technology
At present, the main interface of 3G business network can be divided into two classes, and the first kind is wireless access network (UTRAN, a UMTS Terrestrial Radio Access Network) interface, and is basic according to a general interface protocol modelling, adopts the ATM underlying protocol.Interface type comprises the Iups interface of Iucs interface, RNC and the packet domain of interface Iub interface between mobile base station (NodeB) and radio network controller (RNC, Radio Network Controller), Iur interface, RNC and circuit domain between the RNC.Second class is each interface in the mobile core network, different parts connecting interface, as circuit domain interface B, C, D, E, F, G interface, the Gc of packet domain, Gr, Gf, Gd interface etc., these interfaces are finished corresponding mobile applying portion (MAP in the No.7 mode, Mobile Application Part), be used to carry out exchanges data.
For the Iub interface between NodeB and RNC, the main bearing medium of E1/T1 as Iub interface still adopted in the initial stage networking of present most of operator.When adopting the E1/T1 mode to connect, the E1/T1 physical layer protocol has defined some fault warnings at the state-detection of circuit, comprise dropout (LOS, Loss OfSignal), alarm indication signal (AIS, Alarm Indication Signal), OOF (LFA, Lossof Frame synchronization) etc.The type of these fault warnings is very limited, usually only at as whether signal is arranged on the circuit, and situation such as whether protocol format is correct.
Prior art provides a kind of scheme of E1 loopback detection, that is: use the 16th time slot of E1 frame, on this time slot, send pseudo noise code (PRBS, Pseudo Random Bit Sequences), monitor the reception condition of pseudo noise code simultaneously at receiving terminal, and the data that receive are compared with the pseudo noise code of transmission, and then the wrapped state of judgement circuit.Wherein, the 16th time slot of E1 frame is to keep for backward compatible early stage 2G communication system in the 3G system, and this time slot can be thought idle time slot in the 3G communication system, therefore can realize some technology for detection on this time slot.In addition, the conflict possibility of pseudo noise code is extremely low, therefore can judge the wrapped state of circuit with the transmitting-receiving of pseudo noise code.
Though above-mentioned prior art scheme has utilized pseudo noise code can not conflict, the defective that the advantage that testing reliability is high exists also is conspicuous.Particularly, this scheme has taken reserve channel the 16th time slot, uses 1/31 of E1 bandwidth to realize the loopback detection function, and there is waste in these bandwidth resources to E1; In addition, in the time need using the communication apparatus of the 16th time slot to dock, can cause communication failure, have compatibility issue with some.
In realizing process of the present invention, the inventor is through discovering, above-mentioned prior art can't be distinguished the misconnection and the normal butt joint of the transmitting-receiving butt joint of physical circuit, also will not receive and dispatch butt joint and be defined as fault.Yet in the transmission network of reality, for upper-layer protocol, the transmitting-receiving short circuit of bottom link is a kind of misconnection situation, can directly have influence on to be carried on break-make professional on the physical circuit.No matter be definition and the detection of physical layer for fault itself, still existing fault detect means all can't be made cost-effective detection at this kind misconnection situation, and can only cause efficient very low by manually progressively investigating.
Summary of the invention
The embodiment of the invention provides a kind of method and device of E1 loopback detection, can locate fast the miscellaneous service fault that the E1 line loopback causes.
The embodiment of the invention provides following technical scheme:
The embodiment of the invention provides a kind of method of E1 loopback detection, comprising:
Generate test pattern;
The spare bits of described test pattern by the E1 frame alignment time slot sent on the circuit;
Receive packet from circuit,, then determine to detect loopback if described packet is identical with described test pattern.
The embodiment of the invention also provides a kind of device of E1 loopback detection, comprising:
Generation unit is used to generate test pattern;
Transmitting element is used for test pattern that described generation unit the is generated spare bits by the E1 frame alignment time slot and sends to circuit;
Detecting unit is used for receiving packet from circuit, if described packet is identical with described test pattern, then determines to detect loopback.
The technique scheme that the embodiment of the invention provides, the technical scheme that provides by the various embodiments described above as can be seen, by making full use of the undefined field of agreement, promptly use the spare bits sa4-sa8 among the E1, can locate fast the miscellaneous service fault that the E1 line loopback causes, point out failure cause, and wrapped state is reported the upper strata link processing, can save the time that the transmission engineering personnel investigate problem in a large number, solve a problem promptly.
Below in conjunction with the drawings and specific embodiments the present invention is further described.
Description of drawings
Fig. 1 is the method flow diagram of the embodiment of the invention one E1 loopback detection;
Fig. 2 is the frame structure schematic diagram of prior art E1;
Fig. 3 is the method flow diagram of the embodiment of the invention two E1 loopback detection;
Fig. 4 is the schematic diagram of part E1 link loopback in the embodiment of the invention three IMA networkings, the group;
Fig. 5 is the method flow diagram of the embodiment of the invention three E1 loopback detection;
Fig. 6 is the structure drawing of device of the embodiment of the invention four E1 loopback detection;
Fig. 7 is the embodiment of the invention five E1 link loopback schematic diagrames;
Fig. 8 is embodiment of the invention base station obtains base station configuration by BOOTP a schematic diagram;
BOOTP obtained the schematic diagram of configuration all the time when Fig. 9 was embodiment of the invention E1 loopback on the link of loopback.
Embodiment
The embodiment of the invention provides a kind of method and device of E1 loopback detection, can cause upper-layer protocol layer situation obstructed or link failure to make effective detection to line loopback, and wrapped state is reported the upper strata link processing.For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings, the present invention is described in more detail.
As shown in Figure 1, the method flow diagram of the E1 loopback detection that provides for the embodiment of the invention one may further comprise the steps:
Here need to learn about the frame structure of E1, as shown in Figure 2, comprise 32 time slots in the frame structure of E1, wherein: 0 time slot is used for frame synchronization; The general reservation of the 16th time slot passage is not used in the 3G system, is used for compatible 2G equipment.In the frame alignment time slot of E1, the E1 protocol definition 5 spare bits, i.e. sa4-sa8 is for the self-defined use of each equipment vendors.
As shown in Figure 3, the method flow diagram of the E1 loopback detection that provides for the embodiment of the invention two may further comprise the steps:
As shown in Figure 4, the schematic diagram of part E1 link loopback in the IMA networking that provides for the embodiment of the invention three, the group.Particularly, as shown in Figure 5, the method for the E1 loopback detection that the embodiment of the invention three provides comprises following process:
Particularly, as lnk0 among Fig. 4 and lnk2, the content on the 0th time slot spare bits sa4-sa8 from the E1 frame that circuit receives is consistent with the test pattern that sends, and then thinks to have loopback on this circuit.
What time need explanation:
One, test pattern is picked at random preferably.
Described test pattern can adopt pseudo noise code of the prior art, but because the embodiment of the invention is used to send the limited bits of test pattern, so described test pattern also not exclusively is equal to pseudo noise code of the prior art.Ambient conditions when in addition, described test pattern can also be realized according to function is selected the value after system counts or the certain algorithm process of its process etc. for use.If adopt relatively-stationary test pattern, the test pattern conflict that use opposite end then inevitable and butt joint, thus cause testing result inaccurate, therefore use random pattern to carry out loopback test as far as possible.
Its two, the comprehensive testing result repeatedly of loopback test result is judged.
Because Operation and Maintenance expense available in the E1 frame structure is also few, the spare bits sa4-sa8 of its 0th time slot only has five, that is to say, the figure place that can be used for filling test pattern mostly is five most, can certainly select wherein four, three or still less for use, therefore the length of test pattern is very limited, even used the random test pattern, still has very little probability can form the pattern conflict.In order to reduce the collision probability of test pattern, in the embodiment of the invention three, comprehensively judge, thereby judge the wrapped state of link more accurately by test result repeatedly.
As the further distortion of the invention described above embodiment three, the described pattern that is used for loopback test uses random pattern, and selecting to be difficult for conflict, can to bring in constant renewal at random is standard.Particularly, the ambient conditions the when selection of test pattern can realize according to function selects to use accurate timing device count value, the value after system counts or the certain algorithm process of its process etc.
For example, in the vxWorks operating system, the system function that can utilize operating system to provide calculates random number, just can be used for loopback test through after the correcting process again.
More than the method for E1 loopback detection in the specific embodiment of the invention one, two, three is described in detail, again the device of E1 loopback detection in the specific embodiment of the invention four is described in detail below.
The embodiment of the invention four provides a kind of device of E1 loopback detection, its structure as shown in Figure 6, this device comprises generation unit 601, transmitting element 602, and detecting unit 603; Wherein:
Described generation unit 601 is used to generate test pattern;
Described transmitting element 602 is used for test pattern that described generation unit 601 the is generated spare bits by the E1 frame alignment time slot and sends to circuit;
Described detecting unit 603 is used for receiving packet from circuit, if described packet is identical with described test pattern, then determines to detect loopback.
With reference to the schematic diagram of part E1 link loopback in IMA networking shown in Figure 4, the group, to carry out the procedure declaration of E1 loopback detection as follows to using device that the embodiment of the invention four provides:
At first, generation unit 601 generates test pattern;
Secondly, transmitting element 602 sends to the test pattern that described generation unit 601 generates on the circuit on the spare bits sa4-sa8 of E1 frame the 0th time slot;
At last, detecting unit 603 receives packet from circuit, and packet that receives and the test pattern that sends are before compared, if described packet is identical with described test pattern, then determines to detect loopback; If described packet and described test pattern are inequality, then determine not detect loopback.
Referring again to the schematic diagram of part E1 link loopback in IMA networking shown in Figure 4, the group, to carry out another declarative procedure of E1 loopback detection as follows to using device that the embodiment of the invention four provides:
The test pattern that transmitting element 602 periodically generates described generation unit 601 sends on the circuit on the spare bits sa4-sa8 of E1 frame the 0th time slot;
Detecting unit 603 receives the loopback detection frame from circuit; Loopback detection frame that receives and the test pattern that sends are compared,, then think to detect loopback if identical.
Particularly, as lnk0 among Fig. 4 and lnk2, the content on the 0th time slot spare bits sa4-sa8 from the E1 frame that circuit receives is consistent with the test pattern that sends, and then thinks to have loopback on this circuit.
When detecting unit 603 detects loopback, in time wrapped state is reported the upper strata link processing.
What time the E1 loopback detection device that provides for the invention described above embodiment four also needs explanation:
One, test pattern is picked at random preferably.
If adopt relatively-stationary test pattern, the test pattern conflict that use opposite end then inevitable and butt joint, thus cause testing result inaccurate, therefore use random pattern to carry out loopback test as far as possible.
The described pattern that is used for loopback test uses random pattern, and selecting to be difficult for conflict, can to bring in constant renewal at random is standard.Particularly, the ambient conditions when test pattern can be realized according to function selects to use accurate timing device count value, the value after system counts or the certain algorithm process of its process etc.For example, in the vxWorks operating system, the system function that can utilize operating system to provide calculates random number, just can be used for loopback test through after the correcting process again.
Its two, the comprehensive testing result repeatedly of loopback test result is judged.
Because Operation and Maintenance expense available in the E1 frame structure is also few, the spare bits sa4-sa8 of its 0th time slot only has five, that is to say, the figure place that can be used for filling test pattern only is five, therefore the length of test pattern is very limited, even used the random test pattern, still there is very little probability can form the pattern conflict.In order to reduce the collision probability of test pattern, in the embodiment of the invention four, comprehensively judge, thereby judge the wrapped state of link more accurately by test result repeatedly.
More than by several specific embodiment of the invention the method for E1 loopback detection and the device of E1 loopback detection are described in detail, by in the actual transmissions because line loopback causes the obstructed or this situation of link failure of upper-layer protocol layer to make effective detection, and can in time detected wrapped state be reported the upper strata link processing.In the process that realizes loopback detection,, therefore can not produce any influence to the upper-layer service on the E1 circuit owing to need not take the effective traffic time slot of E1.
Understand and realization the present invention for the ease of persons skilled in the art, existing in conjunction with the scene several commonly used in the 3G system, the above-mentioned specific embodiment of the present invention is further described.
Scene one:
As shown in Figure 7, be the embodiment of the invention five E1 link loopback schematic diagrames.Comprising two E1 paths, be called No. 1 E1 link and No. 2 E1 links respectively, each E1 path has receiving terminal Rx and the transmitting terminal Tx that is used for receiving and sending information respectively.
In the actual sets network process, the part E1/T1 physical link that occurs as shown in Figure 7 is in the loopback connection.For the ima protocol on upper strata, because the Automatic Negotiation Mechanism of ima protocol, make link 1 and link 2 proper communications simultaneously, even may cause the disorder of entire I MA state, the whole faults of all links.If there is not the loopback detection of E1, this kind fault can only rely on manual detection, progressively investigation.And adopt after the described E1 loopback detection of technique scheme of the present invention, can be under the situation that does not influence existing transmission configuration and business fully, just directly indicate the loopback fault of E1 in the E1 physical layer, thereby significantly reduced artificial degree of participation, also improved the treatment effeciency of fault.
Scene two:
In 3G (Third Generation) Moblie, when initial foundation does not have configuration data, need artificial to the near-end loading data for fear of the base station, and need manually intervene can't remote maintenance in the base station time to near-end, several big communication manufacturer unites and has proposed BOOT strapping Protocol (BOOTP, Bootstrap Protocol).Employing sets up remote maintenance channel automatically to base station controller request configuration data based on the mode of the BOOTP default configuration of IPOA.
As shown in Figure 8, the base station that provides for the embodiment of the invention obtains the schematic diagram of base station configuration by BOOTP.Accept and handle the BOOTP request that each base station sends by base station controller in the same subnet, network configuration parameters and start-up parameter are responded to the base station of initiating request.
BOOTP obtains the schematic diagram of configuration all the time during the E1 loopback that provides for the embodiment of the invention as shown in Figure 9, on the link of loopback.Base station and base station controller are according to BOOTP protocol stack normal communication, and the configuration mode of both sides' physical layer must be consistent.Wherein, the base station at first needs to obtain the configuration mode of base station controller physical layer as client, and promptly the configuration mode of the physical layer of base station controller will be intercepted in the base station, can at first intercept from No. 0 link; And base station controller is configured to the IMA/UMI pattern, and corresponding E1 link is respectively 0/1.
If Iub interface is in connected mode shown in Figure 9, if the E1 wrapped state can't detect, the configuration mode of base station controller is attempted to intercept in the base station on the E1/T1 of wrapped state link 0, because " fault " also do not known to exist on this E1 in the base station, then the physical link of BOOTP can not automatically switch yet, like this, will occur intercepting all the time can't be successful, cause the unusual situation of BOOTP to take place, and the base station also obtains the configuration that issues less than base station controller, and can only pass through to base station near-end investigation fault, import base station configuration.
Adopt after the described E1 loopback detection of technique scheme of the present invention, then need not arrive base station near-end investigation fault, thereby significantly reduce artificial degree of participation, also improved the treatment effeciency of fault.
What in addition, also need some is described is:
The loopback detection of in the technical scheme that the invention described above embodiment provides the E1 circuit being carried out, though all are explanations of carrying out with the applicating example in the 3G system, but since in the E1 agreement for the non-fault definition of wrapped state, make in the communication system of other any employing E1, under the situation that loopback exists, if do not add any testing mechanism, the capital causes the interruption of upper strata link, for example, Global Systems for Mobile communications (GSM, Global System for Mobile Communications) can cause during loopback signaling to set up failure in, D path uplink access regulation (LAPD, Link Access Procedure of D-Channel) chain rupture etc. is so the realization of the technical scheme that the embodiment of the invention provides uses the communication system of E1 transmission to have positive meaning equally to other.
In addition, the fault detect of E1 line loopback can expand to all protocol layers.Because for the butt joint of transmission network, the transmitting-receiving of any end butt joint all can cause communication failure, all needs to use similar detection to indicate actual transmission state.
In addition, for the loopback fault detect of each layer, can send data in overhead field, receiving terminal receives verification, thereby detects wrapped state.
The technical scheme that provides by the various embodiments described above as can be seen, by making full use of the undefined field of agreement, promptly use the spare bits sa4-sa8 among the E1, can locate fast the miscellaneous service fault that the E1 line loopback causes, point out failure cause, and wrapped state reported the upper strata link processing, and can save the time that the transmission engineering personnel investigate problem in a large number, solve a problem promptly.Owing to do not take the effective traffic time slot of E1, therefore can the upper-layer service on the E1 circuit not exerted an influence, there is not compatibility issue yet.
More than the method and the device of a kind of E1 loopback detection provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the method for an E1 loopback detection is characterized in that, comprising:
Generate test pattern;
The spare bits of described test pattern by the E1 frame alignment time slot sent on the circuit;
Receive packet from circuit,, then determine to detect loopback if described packet is identical with described test pattern.
2. the method for E1 loopback detection according to claim 1 is characterized in that, the process that the spare bits of described test pattern by the E1 frame alignment time slot sent on the circuit is specially:
Five spare bits of described test pattern by E1 frame the 0th time slot are sent on the circuit.
3. the method for E1 loopback detection according to claim 1 and 2 is characterized in that, repeatedly circulation generates test pattern at random.
4. the method for E1 loopback detection according to claim 3 is characterized in that, described test pattern is that the count value according to timer generates at random.
5. the method for E1 loopback detection according to claim 3 is characterized in that, described test pattern is the random number that calculates by the system function that operating system provides.
6. the device of an E1 loopback detection is characterized in that, comprising:
Generation unit is used to generate test pattern;
Transmitting element is used for test pattern that described generation unit the is generated spare bits by the E1 frame alignment time slot and sends to circuit;
Detecting unit is used for receiving packet from circuit, if described packet is identical with described test pattern, then determines to detect loopback.
7. device according to claim 6 is characterized in that, comprising: five spare bits that described transmitting element specifically is a test pattern that described generation unit is generated by E1 frame the 0th time slot send on the circuit.
8. according to claim 6 or 7 described devices, it is characterized in that, comprising: described generation unit specifically is the generation test pattern at random that repeatedly circulates.
9. device according to claim 8 is characterized in that, described test pattern is that the count value according to timer generates at random.
10. device according to claim 8 is characterized in that, described test pattern is the random number that calculates by the system function that operating system provides.
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| CNA2007101723760A CN101188529A (en) | 2007-12-11 | 2007-12-11 | E1 loop detection method and device |
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| CNA2007101723760A CN101188529A (en) | 2007-12-11 | 2007-12-11 | E1 loop detection method and device |
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| WO2010094229A1 (en) * | 2009-02-23 | 2010-08-26 | 华为技术有限公司 | Method for loop back link detection in transmission cable and device thereof |
| WO2010108376A1 (en) * | 2009-03-27 | 2010-09-30 | 华为技术有限公司 | Method, system and time division multiplex card for fault detection |
| CN101883377A (en) * | 2010-06-24 | 2010-11-10 | 中兴通讯股份有限公司 | Detection method and system of misconnection fault of E1 line or T1 line, and base station |
| CN101631050B (en) * | 2009-06-24 | 2012-05-23 | 中兴通讯股份有限公司 | Device and method for positioning fault point in transmission network |
| CN102045182B (en) * | 2009-10-20 | 2012-08-08 | 华为技术有限公司 | Service fault localization method, device and system |
| CN101296049B (en) * | 2008-06-19 | 2013-03-27 | 中兴通讯股份有限公司 | Method and device for eliminating time slot drifting fault in time division multiplexing system |
| CN101630996B (en) * | 2009-08-17 | 2013-07-10 | 珠海市佳讯实业有限公司 | Ethernet to unframed E1 converter and E1 loopback detection method |
| CN107395448A (en) * | 2017-06-01 | 2017-11-24 | 国网福建省电力有限公司 | A kind of 2M communication checks method and detection device |
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| CN101296049B (en) * | 2008-06-19 | 2013-03-27 | 中兴通讯股份有限公司 | Method and device for eliminating time slot drifting fault in time division multiplexing system |
| WO2010094229A1 (en) * | 2009-02-23 | 2010-08-26 | 华为技术有限公司 | Method for loop back link detection in transmission cable and device thereof |
| WO2010108376A1 (en) * | 2009-03-27 | 2010-09-30 | 华为技术有限公司 | Method, system and time division multiplex card for fault detection |
| CN101631050B (en) * | 2009-06-24 | 2012-05-23 | 中兴通讯股份有限公司 | Device and method for positioning fault point in transmission network |
| CN101630996B (en) * | 2009-08-17 | 2013-07-10 | 珠海市佳讯实业有限公司 | Ethernet to unframed E1 converter and E1 loopback detection method |
| CN102045182B (en) * | 2009-10-20 | 2012-08-08 | 华为技术有限公司 | Service fault localization method, device and system |
| CN101883377B (en) * | 2010-06-24 | 2015-06-03 | 中兴通讯股份有限公司 | Detection method and system of misconnection fault of E1 line or T1 line, and base station |
| WO2011160493A1 (en) * | 2010-06-24 | 2011-12-29 | 中兴通讯股份有限公司 | Fault detection method, system and base station for mistake connection of e1 line or t1 line |
| CN101883377A (en) * | 2010-06-24 | 2010-11-10 | 中兴通讯股份有限公司 | Detection method and system of misconnection fault of E1 line or T1 line, and base station |
| CN107395448A (en) * | 2017-06-01 | 2017-11-24 | 国网福建省电力有限公司 | A kind of 2M communication checks method and detection device |
| CN107395448B (en) * | 2017-06-01 | 2021-04-30 | 国网福建省电力有限公司 | 2M communication detection method and detection equipment |
| CN109412895A (en) * | 2018-11-14 | 2019-03-01 | 电信科学技术第五研究所有限公司 | A kind of method and apparatus detecting E1/T1 chain time gap binding mode |
| CN111194044A (en) * | 2018-11-14 | 2020-05-22 | 中国移动通信集团辽宁有限公司 | Special line dial testing method, device, equipment and medium |
| CN109412895B (en) * | 2018-11-14 | 2020-09-18 | 电信科学技术第五研究所有限公司 | Method and equipment for detecting E1/T1 link time slot binding mode |
| CN111194044B (en) * | 2018-11-14 | 2023-09-19 | 中国移动通信集团辽宁有限公司 | Dedicated line dial testing method, device, equipment and medium |
| CN111324757A (en) * | 2018-12-17 | 2020-06-23 | 北京四维图新科技股份有限公司 | Problem processing method and device for map data |
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| WO2021098157A1 (en) * | 2019-11-22 | 2021-05-27 | 辰芯科技有限公司 | Detection method and apparatus of communication chip, and device and medium |
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