CN101110823B - Method for maintaining consistency of periodic line state between transfer signaling layers - Google Patents
Method for maintaining consistency of periodic line state between transfer signaling layers Download PDFInfo
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Abstract
The present invention proposes a method for maintaining a consistent link state between transmission signaling levels. The link state information is transmitted between a transmission signaling level L2 level and a transmission signaling level L3 level regularly, the L3 level renews the link state information corresponding to the L3 according to the link state information, and maintains the link state consistent. The present invention achieves the purpose that the link state information of the L2 level and the L3 level can be maintained consistent through the following procedures, the L2 level informs the latest link state information of the L3 level, then the L3 level renews the related information, or the L3 level inquires the link state information for the L2 level regularly, and after the L2 level receives the inquiry request, the L2 level transmits the link state information to the L2 level.
Description
Technical field
The present invention relates to the command transmitting system in the communications field, particularly a kind of method of maintaining consistency of periodic line state between transfer signaling layers.
Background technology
Signaling is as a requisite class message in the communication process, and its role is irreplaceable.Along with the development of telephone communication technology, the kind of signaling, the function that has and transmission means thereof have all had bigger expansion.Signaling transmits certain stipulations and the regulation that will observe and is called as signaling method, comprises the version of signaling, the transmission control mode of signaling on the multistage route.Select suitable signaling method, be related to the height of the quality and the cost of investment of whole communication quality.
The classification of signaling is a lot,
Always divide according to the sender, can be divided into forward direction signaling and backward signalling;
Divide according to working range, can be divided into subscriber line signaling and interoffice signaling;
Divide according to transfer channel, can be divided into channel associated signalling and common channel signalling;
Divide according to common function, can be divided into command transmitting, call signaling and control signaling.
Wherein command transmitting is mainly finished transfer function, comprises the management of signaling link, the maintenance of signalling point and the maintenance of signaling network etc.Arrowband No.7 signalling system, broadband No.7 signalling system and Sigtran (Signaling Transport, signaling transfer protocol) signaling system all belongs to the command transmitting system.
The protocol entity of L2 (layer 2) layer comprises MTP2 (Message Transfer Part 2, the 2nd grade of Message Transfer Part) agreement, M2PA (L2Peer to Peer Adaption Layer, L2 equity adaptation layer) agreement and SSCS (Service Specific Convergence Sublayer, Service Specific Convergence Sublayer) agreement, the protocol entity of L3 (layer 3) layer comprises MTP3 (Message Transfer Part 3, Message Transfer Part 3rd level) agreement.
For the command transmitting system, L2 layer and L1 layer are worked together provides signaling link for the reliable delivery of carrying out signaling message between two signalling point SP (Signaling Point), as Fig. 1, mainly finish the management of this Link State and the reliable transmission two big functions of upper-layer user L3 layer data.Wherein the Link State management function is a prerequisite, this function also reports link-state information the L3 layer to cooperate its function of finishing signaling network management function and then finishing the whole signaling system simultaneously, so mutual these link-state informations are very important between L2 layer and the L3 layer.No matter still realize angle, must guarantee that all the information about Link State is consistent between the two, could finish above-mentioned function so reliably from practice from the agreement angle.From the agreement angle, the Link State between the two should be consistent, but is possible from practical term inconsistent between the two, and the two may be inconsistent when unreliable such as L2 layer and L3 interlayer communication.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method of maintaining consistency of periodic line state between transfer signaling layers, guarantees the consistency of Link State between the L2 layer of command transmitting system and the L3 layer reliably.
For addressing the above problem, the present invention proposes a kind of method of maintaining consistency of periodic line state between transfer signaling layers, in command transmitting layer L2 layer and the regular relays link state information of L3 interlayer, the L3 layer upgrades L3 layer corresponding link state information according to described link-state information, keeps the Link State unanimity.
Further, said method also can have following characteristics, and described method specifically comprises following steps:
Step 1, L2 layer regularly send the message indication to the L3 layer, comprise the up-to-date link-state information of L2 layer in the described message indication;
After step 2, L3 layer are received described message indication, upgrade the respective link state information of L3 layer according to described message indication.
Further, said method also can have following characteristics, and in the described step 2, after the respective link state information of renewal L3 layer, L3 course L2 layer is replied acknowledge message.
Further, said method also can have following characteristics, the L2 layer was not received the affirmation message that the L3 layer is replied before sending the message indication next time, then think the failure of this interacting message of L2 layer and L3 layer, if the number of times that the at the appointed time interior interacting message failure of L2 layer and L3 layer occurs continuously thinks then that greater than a predetermined number of times L2 layer and L3 interlayer communication are unusual.
Further, said method also can have following characteristics, if L2 layer and L3 interlayer communication are unusual, L2 course layer pipe reports L2 layer and the unusual information of L3 interlayer communication.
Further, said method also can have following characteristics, and the L2 layer receives that once more affirmation message that the L3 layer is replied then thinks abnormal restoring behind L2 layer and the L3 layer generation communication abnormality.
Further, said method also can have following characteristics, and described method specifically comprises following steps:
Step 1, the L3 layer regularly sends a request message to the L2 layer, the link-state information of inquiry L2 layer;
Step 2, after the L2 layer was received described request message, the inquiry Link State was replied acknowledge message to the L3 layer, comprises the up-to-date link-state information of L2 layer in the described acknowledge message;
Step 3, the L3 layer upgrades the corresponding link state information according to described acknowledge message.
Further, said method also can have following characteristics, the L3 layer was not received the affirmation message that the L2 layer is replied before sending a request message next time, then this interacting message failure of L2 layer and L3 layer, if the number of times that the at the appointed time interior interacting message failure of L2 layer and L3 layer occurs continuously is greater than a predetermined number of times, think that then L2 layer and L3 interlayer communication are unusual, L3 course layer pipe reports L2 layer and the unusual information of L3 interlayer communication.
Further, said method also can have following characteristics, and the L3 layer receives that once more affirmation message that the L2 layer sends then thinks abnormal restoring behind L2 layer and the L3 layer generation communication abnormality.
Further, said method also can have following characteristics, uses No.7 signaling information transmitting portions second level user adaptation layer M2UA entity to carry out adaptive between described L2 layer and the L3 layer.
The present invention is based on command transmitting L2 layer and L3 layer, proposed concrete assurance conforming method of link-state information between the two, and the method is expanded abnormal conditions such as the situation that can also be used to detecting interlayer communication and processor stall.
Description of drawings
Fig. 1 is the typical general protocol stack schematic diagram of command transmitting system;
Fig. 2 is a MTP2 typical protocol stack schematic diagram;
Fig. 3 is a M2PA typical protocol stack schematic diagram;
Fig. 4 is a SSCS typical protocol stack schematic diagram;
Fig. 5 is the adaptive protocol stack schematic diagram of M2UA;
Fig. 6 is a detection method one of the present invention, and the L2 layer is initiatively initiated the detect-message flow chart periodically;
Fig. 7 is a detection method two of the present invention, and the L3 layer is initiatively initiated the detect-message flow chart periodically.
Embodiment
The present invention is by increasing the information of coming the relays link state alternately of interlayer communication primitive message between L2 and L3 layer, thereby reaches between the two the purpose that the information about Link State is consistent.
According to the direction and in proper order different of primitive interacting message, the present invention provides two kinds of methods, and these two kinds of method principles are consistent, are exactly regular interacting message.
The first method that the present invention proposes is: regularly send a message indication L2_StatusInd to the L3 layer by the L2 layer, up-to-date link-state information is informed the L3 layer, the L3 layer upgrades relevant information, the L3 layer is replied acknowledge message L2_StatusCfm of L2 layer after handling this message, the renewal of information has been finished in expression.Message indication L2_StatusInd and acknowledge message L2_StatusCfm can define voluntarily, and no reference format, L2_StatusInd only need comprise the corresponding link state information, and be just passable as long as L2_StatusCfm reaches the affirmation effect.
If the L2 layer was received the L2_StatusCfm message that the L3 layer is replied before sending L2_StatusInd message next time, just think this interacting message success, otherwise think this interacting message failure.
Expression L2 layer this moment and L3 interlayer communication are normal if above-mentioned interacting message is successful, the Link State unanimity; If (the concrete numerical value of fixed time and predetermined number of times can be determined by system the number of times of the mutual failure of continuous meassage greater than a predetermined number of times in the fixed time; number of times can be decided as the case may be; generally should be more than 2 times); such as continuous interacting message failure more than 2 times in the fixed time; think that then L2 layer and L3 interlayer communication are unusual; this moment, the L2 layer can be informed these abnormal conditions layer pipe LM (LayerManager); do further processing by layer pipe, unusual back L2 layer takes place receive successfully that once more L2_StatusCfm message then thinks abnormal restoring.Interacting message as shown in Figure 6.
The second method that the present invention proposes is: regularly send a request message L2_StatusReq to the L2 layer by the L3 layer, the state information of request inquiry link, the L2 layer is replied an acknowledge message L2_StatusAck to the L3 layer after having inquired about Link State, up-to-date link-state information is informed the L3 layer, and the L3 layer is according to the corresponding information of this information updating.Message request L2_StatusReq can define voluntarily, and no reference format is as long as play the function of link-state information inquiry.Acknowledge message L2_StatusAck can define voluntarily, and no reference format is as long as comprise link-state information.
If the L3 layer received L2_StatusAck message that the L2 layer is replied and just think this interacting message success before sending L2_StatusReq message next time, otherwise think this interacting message failure;
Expression L2 layer this moment and L3 interlayer communication are normal if above-mentioned interacting message is successful, the Link State unanimity; If (the concrete numerical value of fixed time and predetermined number of times can be determined by system the number of times of the mutual failure of continuous meassage greater than a predetermined number of times in the fixed time; number of times can be decided as the case may be; generally should be more than 2 times); such as continuous interacting message failure more than 2 times in the fixed time; think that then L2 layer and L3 interlayer communication are unusual; this moment, the L3 layer can be informed these abnormal conditions layer pipe LM; do further processing by layer pipe, unusual back L3 layer takes place receive successfully that once more L2_StatusAck message then thinks abnormal restoring.Interacting message as shown in Figure 7.
Above-mentioned described method is applicable to the protocol stack that different L2 layer protocols is formed: such as the L2 layer is the MTP2 protocol entity, as shown in Figure 2; Or the L2 layer is the M2PA protocol entity, as shown in Figure 3; Or the L2 layer is the SSCS protocol entity, as shown in Figure 4.
Need to prove, title, the form of above-mentioned said message indication, message request and acknowledge message are not limited to L2_StatusInd, L2_StatusCfm, L2_StatusReq and L2_StatusAck among the present invention, the above-mentioned purpose that is useful on all belong to scope of the present invention.
Realization is depended in the setting that regularly sends the timer duration of using in the above-mentioned detection method, but it should be noted that the classical group fidonetFido stack that to consider as Fig. 1, also to consider M2UA (Signaling System 7Message Transfer Part 2-User Adaptation Layer as Fig. 5, No.7 signaling information transmitting portions second level user adaptation layer) strides IP (Internet Protocol, internet protocol) net is made the networking protocol stack of transparent transmission, and this moment, the transmission duration president of data was a little.
Above-mentioned is that the basic method that proposes is applicable to that equally also use M2UA entity comes adaptive situation between L2 layer and the L3 layer with Fig. 1, as shown in Figure 5, mainly uses this moment the transparent transmission effect of M2UA that the primitive message of mentioning in the top described method is carried out transparent transmission.
These two kinds of methods that the present invention proposes can well guarantee the consistency of Link State between L2 layer and the L3 layer.In addition from foregoing description as can be seen, thisly regularly carry out the method for the interacting message communication conditions between can also inspection layer at interlayer, certainly not only be confined to L2 layer and L3 layer the two, can adopt between the adjacent protocol layer of all protocol stacks, so in practice between detection layers communications status means are provided.
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
Following embodiment is one embodiment of the present of invention, the invention is not restricted to down mask body implementation step and concrete message name, message flow.The related embodiment that is under the jurisdiction of the technology of the present invention feature and principle all is protection scope of the present invention.
The exemplary step of method one:
Step 101:L2 course L3 layer sends Link State Indication message L2_StatusInd, comprises the last state of link in this message;
Step 102:L3 layer receives L2_StatusInd message, upgrades corresponding information, and upgrades relevant information according to new Link State, as dynamic routing, office direction etc.;
Step 103: after treating above-mentioned finishing dealing with, L3 course L2 layer is replied acknowledge message L2_StatusCfm;
After step 104:L2 layer receives L2_StatusCfm message, finish this interaction flow, prepare mutual next time.
The exemplary step of method two:
Step 201:L3 course L2 layer sends link state inquiry request message L2_StatusReq;
Step 202:L2 layer receives L2_StatusReq message, to the state of the middle inquiry of Link State controller LSC (LinkState Controller) link;
Step 203:L2 layer is encapsulated into the Link State that inquires among the acknowledge message L2_StatusAck and issues the L3 layer;
After step 204:L3 layer receives L2_StatusAck message, upgrade corresponding information, and upgrade relevant information,, finish this interaction flow, prepare mutual next time as dynamic routing, office direction etc. according to new Link State.
Two kinds of methods of the present invention have following characteristics,
1, the present invention regularly carries out the mutual of message between L2 layer and L3 layer, to reach relays link state information and maintenance L2 layer and the L3 layer purpose about the consistency on messaging of Link State.
2, the present invention is in order to realize the purpose described in 1, carry out need having up-to-date link-state information in the interactive messages.
3, the interacting message that regularly carries out among the present invention, message is paired appearance (request message or Indication message, the another one acknowledge message has promptly added affirmation mechanism), it is mutual that the flow process of a success is included in a preset time interior (in the one-period) a pair of message ground success.
4, adopting time and again failure among the present invention negates mechanism, promptly repeatedly thinks that just interlayer communication is unusual after the interacting message failure, rather than mutual failure just thinks that once interlayer communication is unusual.
5, the L2 layer described in 1 comprises MTP2 protocol entity, M2PA protocol entity and SSCS protocol entity, and L3 is the MTP3 protocol entity.
6, said method is equally applicable to use between L2 layer and the L3 layer M2UA entity to carry out adaptive situation, as shown in Figure 5.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the method for a maintaining consistency of periodic line state between transfer signaling layers, in command transmitting layer L2 layer and the regular relays link state information of L3 interlayer, the L3 layer upgrades L3 layer corresponding link state information according to described link-state information, keeps the Link State unanimity; Described L2 layer comprises MTP2 protocol entity, M2PA protocol entity and SSCS protocol entity, and described L3 is the MTP3 protocol entity.
2. the method for claim 1 is characterized in that, described method specifically comprises following steps:
Step 1, L2 layer regularly send the message indication to the L3 layer, comprise the up-to-date link-state information of L2 layer in the described message indication;
After step 2, L3 layer are received described message indication, upgrade the respective link state information of L3 layer according to described message indication.
3. method as claimed in claim 2 is characterized in that, in the described step 2, after the respective link state information of renewal L3 layer, L3 course L2 layer is replied acknowledge message.
4. method as claimed in claim 3, it is characterized in that, the L2 layer was not received the affirmation message that the L3 layer is replied before sending the message indication next time, then think the failure of this interacting message of L2 layer and L3 layer, if the number of times that the at the appointed time interior interacting message failure of L2 layer and L3 layer occurs continuously thinks then that greater than a predetermined number of times L2 layer and L3 interlayer communication are unusual.
5. method as claimed in claim 4 is characterized in that, if L2 layer and L3 interlayer communication are unusual, L2 course layer pipe reports L2 layer and the unusual information of L3 interlayer communication.
6. as claim 4 or 5 described methods, it is characterized in that the L2 layer receives that once more affirmation message that the L3 layer is replied then thinks abnormal restoring behind L2 layer and the L3 layer generation communication abnormality.
7. the method for claim 1 is characterized in that, described method specifically comprises following steps:
Step 1, the L3 layer regularly sends a request message to the L2 layer, the link-state information of inquiry L2 layer;
Step 2, after the L2 layer was received described request message, the inquiry Link State was replied acknowledge message to the L3 layer, comprises the up-to-date link-state information of L2 layer in the described acknowledge message;
Step 3, the L3 layer upgrades the corresponding link state information according to described acknowledge message.
8. method as claimed in claim 7, it is characterized in that, the L3 layer was not received the affirmation message that the L2 layer is replied before sending a request message next time, then this interacting message failure of L2 layer and L3 layer, if the number of times that the at the appointed time interior interacting message failure of L2 layer and L3 layer occurs continuously is greater than a predetermined number of times, think that then L2 layer and L3 interlayer communication are unusual, L3 course layer pipe reports L2 layer and the unusual information of L3 interlayer communication.
9. method as claimed in claim 8 is characterized in that, the L3 layer receives that once more affirmation message that the L2 layer sends then thinks abnormal restoring behind L2 layer and the L3 layer generation communication abnormality.
10. as claim 1 or 2 or 7 described methods, it is characterized in that, use No.7 signaling information transmitting portions second level user adaptation layer M2UA entity to carry out adaptive between described L2 layer and the L3 layer.
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| CN1960310A (en) * | 2006-11-01 | 2007-05-09 | 华为技术有限公司 | Method and system of realizing rig network protection |
| CN101013992A (en) * | 2007-02-14 | 2007-08-08 | 中兴通讯股份有限公司 | Automatic protection method of Ethernet |
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| CN1960310A (en) * | 2006-11-01 | 2007-05-09 | 华为技术有限公司 | Method and system of realizing rig network protection |
| CN101013992A (en) * | 2007-02-14 | 2007-08-08 | 中兴通讯股份有限公司 | Automatic protection method of Ethernet |
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