CN1545278A - Method for C path state detecting of V5 access adaptation - Google Patents
Method for C path state detecting of V5 access adaptation Download PDFInfo
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- CN1545278A CN1545278A CNA2003101123104A CN200310112310A CN1545278A CN 1545278 A CN1545278 A CN 1545278A CN A2003101123104 A CNA2003101123104 A CN A2003101123104A CN 200310112310 A CN200310112310 A CN 200310112310A CN 1545278 A CN1545278 A CN 1545278A
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Abstract
The invention is a V5 access and adapter C-path state detecting method, defining C-path state request, stop and indication information between soft exchange and signaling gateway; the soft exchange sends C-path state request information to the signaling gateway at regular time; the signaling gateway responds with C-path state indication information with different state-value parameters according to the current C-path actual state; the soft exchange receives the C-path state indication information from the signaling gateway, and confirm the allocated C-path state; information-appointed C-path is not configured on the soft exchange, the soft exchange notifies the gateway to cancel C-path allocation, and the signaling gateway receives C-path state stop information from the soft exchange, and confirm specific C-path allocation relation cancel. The soft exchange has a mechanism of actively detecting C-path state. Compared with the existing techniques, soft exchange can detect failure in access device and takes protective action, so as to make network communication more reliable and high-efficiency.
Description
Technical field
The present invention relates to the V5 signaling (a kind of Access Network signaling) of the communications field, is the C path status detection method that a kind of V5 inserts.Especially when being implemented on the physical equipment with second level function, LE (local switch) the side third level separates, adopt IETF (Internet Engineering Task Force between the equipment, the Internet engineering duty group, normal structure) situation of adaptation layer protocol intercommunication.
Background technology
Adopt the V5 signaling system between LE and the AN (Access Network).The V5 signaling comprises three layer functions, and the second layer wherein is the data link functional layer.The data link of carrying the 3rd layer protocol is called communication path, i.e. the C path.The C path is set up and is removed by the 3rd layer of indication of V5, and the assignment data in C path are at three-layer maintenance.
The state in C path is crucial for the V5 signaling system.Traditional LE equipment since in an equipment complete V5 signaling three layer functions of having realized, the 3rd layer function entity always can obtain the state in the C path of being realized by second layer functional entity, the acquisition mode of this state is based on that the LE device interior realizes.On the other hand, second layer entity also can obtain the C path configuration information by other management entity in the 3rd layer or the LE equipment, and these information are important to the data initialization of second layer entity.
Along with the development of IP technology, the telecommunications network and the IP network of legacy circuit-switched merge gradually, and NGN (next generation network) thought and technology maturation are got up.In the NGN framework for the realization of V5, be to go up in soft switch (or application server) to realize the 3rd layer function, and second and the ground floor function go up to realize that at SGW (or media gateway) V5UA (V5 User Adaptation Layer agreement) that adopts the IETF signaling to transmit working group between soft switch and the SGW transmits the V5 signaling.Below with reference to document specifies function, message and the program of V5UA agreement: list of references one: " V5 User Adaptation Layer " (Nortel Networks, in May, 2003, network address: http://www.ietf.org/internet-drafts/draft-ietf-sigtran-v5ua-04. txt); List of references two: " user adaptation layer standard I SDN Q.921 " (Nortel Networks, February calendar year 2001 network address: http://www.ietf.org/internet-drafts/draft-ietf-sigtran-v5ua-04. txt).
The V5UA agreement transmits the message support to the transmission of V5 signaling message on Packet Based Network by primitive such as Data, UnitData and Establish and Release.But the V5UA agreement does not provide the message and the program of the 3rd layer entity second layer entity detection C path status on SGW in the soft switch; Therefore, second level functional entity dysfunction causes C path operation irregularity on gateway, and soft switch often can't in time detect and carry out suitable protection operation, causes the fault of the call business of soft switch control easily.In addition, the second layer functional entity in the SGW is when setting up the C path of V5 the 3rd layer entity appointment, and needing be the suitable data field of C path allocation in advance, and use during transceive data on data link these data fields.Simultaneously, because the interface of SGW and AN equipment is based on circuit exchange mode, need to set up in advance HDLC (High-Level Data Link Control) between second layer entity and the ground floor physical link and connect, even pass through unit component such as time division switching network possibly as carrying.The distribution of data field, cancel and set up or discharge operation such as HDLC and think that SGW is an initialization operation of setting up and discharge the C path, this operation depends on gateway can obtain clear and definite C path assignation information.The V5UA agreement is not supported in the function in clear and definite assignment C path between soft switch and the SGW, and what gateway will be by other obtains the assignment data in C path based on the configuration order of equipment.
Summary of the invention
The object of the present invention is to provide a kind of method that between soft switch and SGW, detects the C path status.
Technical scheme of the present invention is:
1.1 between soft switch and SGW, define the C path state request, stop and Indication message; Wherein: status request message is used for soft switch to the current state of the specific C of SGW request path on gateway; State indication message is used for the current state of gateway to soft switch indication appointment C path, and the C path status comprises " setting up " and " setting up " two kinds; The C path status stops message and is used for soft switch and is cancelled to being configured in the soft switch of C path of SGW indication appointment;
1.2 soft switch regularly sends C path state request message to SGW, the C path of appointment in the message is the communication path of assignment in soft switch V5 the 3rd layer function entity;
1.3 SGW responds the C path status Indication message that has the different conditions value parameter according to the virtual condition in current C path, can comprise:
2.1C the path is set up and be working properly, the SGW response has the C path status Indication message of " setting up " state parameter value, and SGW does not have follow-up action;
2.2C the path is not set up, the SGW response has the C path Indication message of " not setting up " state parameter value, continues operation in the implementation 3;
2.3 SGW is confirmed the assignment of specific C path, gateway is carried out the initialization operation of setting up the C path;
1.4 soft switch receives the C path status Indication message from SGW, confirms the state in assignment C path, can comprise following three kinds of situations:
3.1 state indication message indication C sets up in the path, soft switch confirms that the C path is working properly;
3.2 state indication message indication C does not set up in the path, soft switch starts the C path creation facilities program (CFP) of V5UA agreement and sets up the C path to the SGW request;
3.3 can not receive state indication message, C path operation irregularity on the SGW is judged in soft switch, soft switch is to the notice of management entity report C path operation irregularity, and soft switch simultaneously starts C path creation facilities program (CFP) and sets up the C path to the SGW request;
1.5 soft switch receives C path status Indication message from SGW, but the not configuration in soft switch of the C path of message appointment, assignment cancellation in soft switch notification gateway C path can comprise following two kinds of situations:
4.1 state indication message indication C sets up in the path, soft switch sends ReleaseRequest (discharging request) and the C path status stops message to SGW;
4.2 state indication message indication C does not set up in the path, soft switch sends the C path status to SGW and stops message;
1.6 the C path status that SGW receives from soft switch stops message, confirms the assignment relation cancellation in specific C path.
Adopt the method for the invention, soft switch has possessed the mechanism of active detecting C path status.Compared with the prior art, soft switch can detect the fault of access device generation quickly and take the protection action, makes communication network reliable more, efficient.
Description of drawings
Fig. 1 is the public message header structure of C path status message;
Fig. 2 is the V5UA message header structure of C path status message;
Fig. 3 is the state parameter structure of C path status Indication message;
Fig. 4 is the message flow of foundation of C path and state-detection;
Fig. 5 is the message flow that the C path discharges.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are elaborated.
The C path state request, stop with Indication message and list of references in the primitive of V5UA protocol definition to transmit message identical, all comprise public head of message and V5UA message header, C path status Indication message also comprises a state parameter.The coding of common message header, V5UA message header and state parameter is shown in Fig. 1,2 and 3.
The parameter of V5UA message header is used to identify specific C path.State parameter uses 0 and 1 to represent that respectively the C path " is set up " and " not setting up " two states.The News Category value of C path status message in public head is 9, and promptly C path status message is that primitive as the V5UA agreement transmits Message Processing.The state request, stop dual mode being arranged with the type of message value of Indication message:
1) value of message types is set at 11,12 and 13 respectively; Or
2) set by the value of ietf definition expansion V5UA primitive transmission message, as being made as 128,129 and 130 respectively.The setting of first kind of mode, C path status message (ask, stop and indication) has identical type of message coding with V5 link-state message (begin, stop and indication), channel number, data link connection identifier and encapsulation function address field are nonsensical in the V5UA message header of V5 link-state message that different is, value complete 0.This mode makes C path status message handle as special V5 link-state message, when the system that does not support C path status message receives such message, can handle according to the program of handling the V5 link-state message, and system is had no adverse effects.The setting of the second way for the system that does not support such message, will abandon these C path status message by V5UA agreement regulation, to corresponding V5 link and the also not influence of C path.
Fig. 4 is the message flow chart of foundation of C path and state-detection.When the soft switch assignment set up and activated the V5UA agreement between new C path or soft switch and the SGW and connect, soft switch sends C path state request message to SGW.This message is represented the state in soft switch expectation inquiry appointment C path, and also expression will be set up the specific C path of institute's assignment simultaneously.SGW accepting state request message responds the Indication message that has " setting up " state parameter value when link is not set up, gateway is set up the initialization operation of C path necessity simultaneously, receives and dispatches buffer memory etc. as distribute data.Soft switch is set up by EstablishRequest (setting up request) the primitive transmission message request gateway of V5UA agreement regulation and is specified the C path; Gateway is successfully set up back response Establish Confirm (set up and confirm) message in the C path.Soft switch timed sending C path state request message detects and specifies the C path status; Gateway responsive state Indication message report C sets up in the path.Timer duration will be set according to network condition between soft switch and the gateway and relevant device type, and general scope is 10 ~ 30 seconds.When receiving the state indication message of state value for " set up ", or when failing to receive state indication message, soft switch will be carried out the corresponding protection operation.Basic protection operation is that soft switch is carried out the C path re-establishing by Establish Request message immediately.Judge and fail to receive that the operation of state indication message can carry out in the timer expiry incident.
Fig. 5 is the message flow that the C path discharges.Soft switch discharges specific C path to ReleaseRequest (removal request) the primitive transmission message request that SGW sends the V5UA agreement; Gateway responds Release Confirm (deletion is confirmed) message to soft switch after successfully discharging appointment C path.Soft switch can send the C path status to gateway and stop message after sending the release request message, notifies specific C path assignment to close to tie up in the soft switch and cancels.Gateway receives the C path status when stopping message, and when the C path discharges, gateway can be cancelled the system resource of specifying the C path allocation for setting up, as data transmitting-receiving buffer memory etc.Gateway does not receive that the C path status stops message, should abandon this message when the C path discharges; The release in C path can only be carried out under the release message indication of V5UA agreement regulation.
Claims (4)
1, a kind of V5 inserts adapter C path status detection method, comprising:
1.1 between soft switch and SGW, define the C path state request, stop and Indication message;
1.2 soft switch regularly sends C path state request message to SGW, the C path of appointment in the message is the communication path of assignment in soft switch V5 the 3rd layer function entity;
1.3 SGW has the C path status Indication message of different conditions value parameter according to the virtual condition response in current C path;
1.4 soft switch receives the C path status Indication message from SGW, confirms the state in assignment C path;
1.5 soft switch receives C path status Indication message from SGW, but the not configuration in soft switch of the C path of message appointment, soft switch notification gateway C path assignment cancellation;
1.6 the C path status that SGW receives from soft switch stops message, confirms the assignment relation cancellation in specific C path.
2, the described V5 of claim 1 inserts adapter C path status detection method, it is characterized in that, according to different situations response different messages, is meant in the described step 1.3:
2.1 the C path is set up and be working properly, the SGW response has the C path status Indication message of " setting up " state parameter value, and SGW does not have follow-up action;
2.2 C does not set up in the path, the SGW response has the C path Indication message of " not setting up " state parameter value, continues operation in the implementation 3;
2.3 SGW is confirmed the assignment of specific C path, gateway is carried out the initialization operation of setting up the C path.
3, the described V5 of claim 1 inserts adapter C path status detection method, it is characterized in that, confirms the state in assignment C path described in the described step 1.4, comprising:
3.1 state indication message indication C sets up in the path, soft switch confirms that the C path is working properly;
3.2 state indication message indication C does not set up in the path, soft switch starts the C path creation facilities program (CFP) of V5UA agreement and sets up the C path to the SGW request;
3.3 can not receive state indication message, C path operation irregularity on the SGW is judged in soft switch, soft switch is to the notice of management entity report C path operation irregularity, and soft switch simultaneously starts C path creation facilities program (CFP) and sets up the C path to the SGW request.
4, the described V5 of claim 1 inserts adapter C path status detection method, it is characterized in that, the C path of the message appointment in the described step 1.5 is not configuration in soft switch, and assignment cancellation in soft switch notification gateway C path comprises following situation:
4.1 state indication message indication C sets up in the path, soft switch stops message to SGW transmission release request and C path status;
4.2 state indication message indication C does not set up in the path, soft switch sends the C path status to SGW and stops message.
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| CNB2003101123104A CN100512237C (en) | 2003-11-20 | 2003-11-20 | Method for C path state detecting of V5 access adaptation |
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| CNB2003101123104A CN100512237C (en) | 2003-11-20 | 2003-11-20 | Method for C path state detecting of V5 access adaptation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101193097B (en) * | 2006-11-22 | 2011-11-30 | 中兴通讯股份有限公司 | A link state inquiry response method and its device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110934C (en) * | 1999-03-31 | 2003-06-04 | 上海贝尔电话设备制造有限公司 | Assigned control component of V5.2 interface between digital exchange and access network |
| JP2001292142A (en) * | 2000-04-05 | 2001-10-19 | Nec Corp | Atm network and floating path detection releasing method in the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101193097B (en) * | 2006-11-22 | 2011-11-30 | 中兴通讯股份有限公司 | A link state inquiry response method and its device |
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