CN103179033A - Method for generating internetwork call routing automatically - Google Patents
Method for generating internetwork call routing automatically Download PDFInfo
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- CN103179033A CN103179033A CN2011104353865A CN201110435386A CN103179033A CN 103179033 A CN103179033 A CN 103179033A CN 2011104353865 A CN2011104353865 A CN 2011104353865A CN 201110435386 A CN201110435386 A CN 201110435386A CN 103179033 A CN103179033 A CN 103179033A
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Abstract
The invention discloses a method for generating internetwork call routing automatically, which is applied to a changeable topology distributed type IP (Internet Protocol) soft switching network. The method comprises the steps of: discovering and establishing adjacent relationships between switching nodes, interacting of interoffice call routing information based on the adjacent relationships, and automatically generating local call routing according to a configured routing strategy. The method when being applied to the switching environment of a bearer network with an IP layer between the switching nodes can generate call routing of each switching node in the distributed switching network automatically, rapidly and flexibly, finish updating of the call routing of all the switching nodes in the network automatically when the number routing change occurs due to the change of the switching topology, the Internet and the like, guarantee correct connection of the call, and can be applicable to special communication networks such as a mobile communication system for military use and an emergency communication system.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of cross-net call route automatic generation method that is applied in variable topology distribution formula IP-based switching network.
Background technology
When communication network carries out between exchange the call business intercommunication, need carry out in switching network inside the unified static data configuration of the whole network, calling by way of each intra-exchange carry out the number route analysis, continue to next exchange, in net, business continuing is to the switching node at called place, network utility continues to the internet by the critical point switching node, thereby realizes call-connection process.It is called that this static call routing Configuration method can guarantee that cross-net call is passed to according to the strategy of prior setting accurately, is applicable to network topology fixing and the Internet system section and plans also relatively-stationary network.
in some dedicated communications networks, such as the military mobile communication system, in emergency communication system, from survivability, the aspects such as mobility are considered, each switching node is implemented distributed exchange, both but single node worked alone, but networking is used again, and switching node carries out motor-driven carrying, access other the Internets systems with meeting, network topology during networking changes often, with other nets be that interconnected critical point switching node also exists the network site changeability, only depend on static call routing collocation method this moment, when changing, the per call route carries out that in full switching network, the unified configuration change of each node is difficult to carry out, can't adapt to the quick variation of network topology.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of cross-net call route automatic generation method of using in the distributed IP flexible exchanging network, it is based on setting up a kind of technology of call routing auto negotiation on IP-based switching's network, the call routing of each switching node in the distributed switching network of automatic generation of fast and flexible, and change and when producing the number route and changing at commutative Topology, the Internet system etc., automatically complete all call routing of switching node renewals in net, what assurance was called out correctly continues.
For achieving the above object, the invention provides a kind of cross-net call route automatic generation method, the discovery that comprises neighbouring relations between switching node is set up, it is characterized in that, further comprising the steps of: the station to station call route messages based on neighbouring relations generates the local call route alternately and according to the routing policy that configures automatically.
Further, described station to station call route messages comprises the following steps alternately:
Steps A 1: switching node sends call routing message to adjacent switching node;
Steps A 2: after adjacent switching node receives the call routing message of transmission, send response message (ACK) to described switching node, while maintenance call routing table, the call routing of the described switching node of increase;
Steps A 3: if switching node is received response message, finish this call routing message process, otherwise jump to steps A 4;
Steps A 4: judge that switching node sends call routing message number of times to adjacent switching node and whether surpasses maximum retransmission, described maximum retransmission if so, jumps to steps A 5 according to the network topology change frequency setting, otherwise jumps to steps A 1;
Steps A 5: judge that adjacent switching node lost efficacy, while maintenance call routing table, the call routing of the described adjacent switching node of deletion;
Steps A 6: restart the discovery foundation of described adjacent switching node being carried out neighbouring relations.
Further, described call routing message comprises: adjacent exchange call route messages in other nets that other the Internets that exchange node ID, switching node self number ability information and current disposal ability, local exchange connect are number ability information and current link processing ability, converge.
Further, described call routing table comprise routing number section, node ID, disposal ability, route-type, by way of nodes and obtain manner field.
Further, described routing policy comprises maximum coupling preference strategy, shortest path first strategy, idle preference strategy, local first strategy and static configuration preference strategy.
Further, described switching node comprises that call routing message processing unit, call routing generate and query unit: described call routing interoffice signaling processing unit is used for sending and receiving call routing message, response message; Described call routing generates and query unit, is used for generating and the maintenance call routing table, and chooses call routing by policy lookup.
The present invention is introduced into the dynamic routing theory in data communication network in mobile communications network, utilize IP to be carried between adjacent switching node and set up communication mechanism, thereby the number ability that each exchange is entrained carries out transmitting between the whole network switching node, realizes the automatic generation of call routing table by collocation strategy and judgement at each node.Compared with prior art, the present invention has following characteristics:
At first, the method can effectively adapt to the quick variation of network topology, in less convergence time, when distributed switching network is offered, the service time of the distributed switching network of reduction of maximum possible and less a large amount of configuration effort, fast automatic generation the whole network call routing; In the time of network topology change, adapt to fast network topology, change call routing, realize continuing of custom calling service within the shortest time.
Secondly, distributed switching network is for guaranteeing the interconnected fast of switching node, neighbouring relations between switching node are usually redundancy and complexity, the on-net call route usually has the characteristic of multipath, in this case, the method can be completed preferred to the call proceeding path according to implementation strategy, guarantees that call business rationally effectively continues;
Again, distributed switching network possesses simultaneously with the characteristic of meeting access, also has the situation of multinode, multiple exit with other the Internets systems, in this case, the method can preferably export according to each outbound loading condition, realizes accurately continuing and load sharing of network utility.
The present invention can be applicable to have between switching node the switched environment of IP layer bearer network, carries out call routing and generate negotiation on the IP bearer network, can be applicable to IP-based switching's core network of R4 and above version.Simultaneously, the main demand of the method is take distributed variable topological network as main, can be applicable to the fields such as military, police, oil field, colliery, city emergency.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the flow chart of cross-net call route automatic generation method of the present invention;
Fig. 2 is the message exchange procedure schematic diagram of call routing interacting message situation one of the present invention;
Fig. 3 is the message exchange procedure schematic diagram of call routing interacting message situation two of the present invention;
Fig. 4 is the structural representation of switching node call routing message in call routing interacting message of the present invention;
Fig. 5 is switching node illustrative view of functional configuration of the present invention.
Embodiment
As shown in Figure 1, the invention provides a kind of cross-net call route automatic generation method that is applied to the distributed IP flexible exchanging network, comprise the following steps: between switching node the discovery of neighbouring relations set up, mutual and automatically generate the local call route according to the routing policy of configuration based on the station to station call route messages of neighbouring relations.
Station to station call route messages based on neighbouring relations comprises the following steps alternately:
Steps A 1: switching node sends call routing message to adjacent switching node;
Steps A 2: after adjacent switching node receives the call routing message of transmission, send response message (ACK) to described switching node, while maintenance call routing table, the call routing of the described switching node of increase;
Steps A 3: if switching node is received response message, finish this call routing message process, otherwise jump to steps A 4;
Steps A 4: judge that switching node sends call routing message number of times to adjacent switching node and whether surpasses maximum retransmission, described maximum retransmission if so, jumps to steps A 5 according to the network topology change frequency setting, otherwise jumps to steps A 1;
Steps A 5: judge that adjacent switching node lost efficacy, while maintenance call routing table, the call routing of the described adjacent switching node of deletion;
Steps A 6: restart the discovery foundation of described adjacent switching node being carried out neighbouring relations.
Fig. 2 and Fig. 3 be respectively two switching nodes in the call routing message interaction process, the message exchange procedure schematic diagram under two kinds of situations.
Automatically generate in order to support call routing, adjacent interexchange need transmit alternately by the call routing message of following main relevant parameters information structure (parameter such as message id, verification and technology correlation are less, do not describe in detail): the exchange node ID; Switching node self number ability information and current disposal ability; Other the Internets that local exchange connects are number ability information and current link processing ability; Adjacent exchange call routing iinformation in other nets that converge.Call routing message after converging comprise route messages by way of the switching node number, every through once converging forwarding, nodes increases by one jumps, and as the foundation of shortest path route generation strategy, and route no longer forwards when jumping figure equals to net interior maximum node number.Fig. 4 is the structural representation of switching node call routing message in the call routing message interaction process.
interoffice signaling that switching network adopts mainly is divided into TUP at present, ISUP, BICC, several large classes of SIP, wherein TUP/ISUP message adopts the TDM bearing modes more when using, the BICC signaling, the SIP signaling can be applicable to the IP carrying, but being mainly, the type of message of BICC and parameter-definition call out and some related service services, message content comparatively solidifies, for the more difficult realization of the carrying of above-mentioned message, so the interoffice route messages is mainly considered based on sip message alternately, as INFO, the message bearings such as MESSAGE are realized, this mode is applicable to originally just adopt SIP as the switching network of interoffice signaling, switching network as the IMS framework, the mutual another kind of bearing mode of interoffice route messages is that newly-increased signaling method based on the UDP carrying is realized between switching node, interoffice adopts fixedly udp port monitoring and sends related news, this mode universality is better, and carrying can realize as long as there is IP in interoffice.
After switching node receives the call routing that adjacent exchange transmission comes, generate call routing table, the call routing list structure mainly comprises routing number section, node ID, disposal ability, route-type, by way of nodes and obtain manner field, and is as shown in table 1:
Table 1 call routing list structure
| Sequence number | The routing number section | Node ID | Disposal ability | Route-type | Nodes | Obtain |
| 1 | 6345 | sw-2 | 90 | Local | 0 | Static |
| 2 | 5123 | sw-3 | 30 | Far-end | 3 | Dynamically |
Wherein each explanation of field is as follows:
The routing number section is called left matching number section of mating in calling; Node ID is adjacent switching node sign, and in net, unified distribution, guarantee uniqueness; Disposal ability is namely for the residue of current routing number section available processing and link circuit resource number; Route-type temporarily is divided into local routing and far-end route, and the number ability that belongs to local exchange number ability or local exchange direct-connected the Internet system is divided into local routing, and what transmitted by adjacent switching node is the far-end route; Nodes is the switching node number of current route approach; Obtain manner is divided into static and dynamic two kinds, manual configuration belong to static mode, what automatically generate is dynamical fashion.
The route generting machanism is reading on the basis of routing table, can finally carry out the generation of local call route according to pre-configured routing policy, wherein comprises following strategy configuration:
1) maximum coupling preference strategy: in calling procedure, the maximum route of called number match bit array that switching node is chosen in calling out with this is carried out call proceeding.
2) shortest path first strategy: in the situation that it is identical the number ability to occur, switching node is chosen in whole routes the route by way of the nodes minimum and is carried out call proceeding.
3) idle preference strategy: in the situation that it is identical the number ability to occur, switching node is according to the current disposal ability state that transmits, choose the larger route of rest processing capacity and carry out call proceeding, mainly use when distributed switching network exists multiple internet to be outlet.
4) local first strategy: exist when this switching node in the situation of match calls route, even do not meet maximum matching strategy, also preferentially adopt the local call route to continue.
5) static configuration preference strategy: switching node is supported the configuration of traditional static call routing, and after static configuration came into force, the call routing of preferentially choosing static configuration continued.
Corresponding to station to station call route automatic generation method of the present invention, require tradition exchange network element to increase station to station call route propagation function, can produce and process related news, and need possess routing inquiry and reach the function of choosing route by strategy.For the realization of this two parts function, need to be to existing exchange network element, as implementing increased functionality on the network element devices such as programme-controlled exchange center, mobile switching centre (MSC), make it can process dynamic calling route signaling and carry out call routing by strategy and choose.As shown in Figure 5, be the switching node illustrative view of functional configuration that relates in the present invention, described switching node is except existing switching network meta function unit, comprise that also call routing message processing unit, call routing generate and query unit: described call routing interoffice signaling processing unit is used for sending and receiving call routing message, response message; Described call routing generates and query unit, is used for generating and the maintenance call routing table, and chooses call routing by policy lookup.Existing switching network meta function unit comprises that mainly neighbouring relations find to set up the unit, is used for interoffice and finds and set up neighborhood.
Above embodiment only is used for explanation the present invention, but not is used for limiting the present invention, the equivalent variations that those skilled in the art carry out above-described embodiment.Replace all within the claim protection range.
Claims (6)
1. cross-net call route automatic generation method, the discovery that comprises neighbouring relations between switching node is set up, it is characterized in that, further comprising the steps of: the station to station call route messages based on neighbouring relations generates the local call route alternately and according to the routing policy that configures automatically.
2. cross-net call route automatic generation method according to claim 1, is characterized in that, described station to station call route messages comprises the following steps alternately:
Steps A 1: switching node sends call routing message to adjacent switching node;
Steps A 2: after adjacent switching node receives the call routing message of transmission, send response message (ACK) to described switching node, while maintenance call routing table, the call routing of the described switching node of increase;
Steps A 3: if switching node is received response message, finish this call routing message process, otherwise jump to steps A 4;
Steps A 4: judge that switching node sends call routing message number of times to adjacent switching node and whether surpasses maximum retransmission, described maximum retransmission if so, jumps to steps A 5 according to the network topology change frequency setting, otherwise jumps to steps A 1;
Steps A 5: judge that adjacent switching node lost efficacy, while maintenance call routing table, the call routing of the described adjacent switching node of deletion;
Steps A 6: restart the discovery foundation of described adjacent switching node being carried out neighbouring relations.
3. cross-net call route automatic generation method according to claim 1 and 2, it is characterized in that, described call routing message comprises: adjacent exchange call route messages in other nets that other the Internets that exchange node ID, switching node self number ability information and current disposal ability, local exchange connect are number ability information and current link processing ability, converge.
4. cross-net call route automatic generation method according to claim 2, is characterized in that, described call routing table comprises routing number section, node ID, disposal ability, route-type, by way of nodes and obtain manner field.
5. cross-net call route automatic generation method according to claim 1, is characterized in that, described routing policy comprises maximum coupling preference strategy, shortest path first strategy, idle preference strategy, local first strategy and static configuration preference strategy.
According to claim 1 to 3 arbitrary described cross-net call route automatic generation method wherein, it is characterized in that, described switching node comprises that call routing message processing unit, call routing generate and query unit:
Described call routing interoffice signaling processing unit is used for sending and receiving call routing message, response message;
Described call routing generates and query unit, is used for generating and the maintenance call routing table, and chooses call routing by policy lookup.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116112606A (en) * | 2023-04-11 | 2023-05-12 | 中国电子科技集团公司第五十四研究所 | Multi-network system distributed networking dynamic call route establishment method |
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Application publication date: 20130626 |