CN100394736C - Improvement of multi-medium communication reliability by logic media - Google Patents
Improvement of multi-medium communication reliability by logic media Download PDFInfo
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- CN100394736C CN100394736C CNB2004100738549A CN200410073854A CN100394736C CN 100394736 C CN100394736 C CN 100394736C CN B2004100738549 A CNB2004100738549 A CN B2004100738549A CN 200410073854 A CN200410073854 A CN 200410073854A CN 100394736 C CN100394736 C CN 100394736C
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Abstract
The present invention discloses a method for improving reliability of multimedia communication by using a logic media channel, which is used in an IP network for bearing multimedia data. The method is characterized in that at least one logic media channel is arranged at an application layer of an IP network, network paths used for transmitting multimedia information in the logic media channel and the IP network form one-to-one mapping relationship, the mapping relationship is adjusted in real time according to the condition whether the network paths can be used, and the multimedia information are transmitted according to the mapping network paths of the logic media channel. In the method of the present invention, the multimedia communication between media gateways are partaken on a plurality of logic media channels, when a certain link has failure, only one part of sessions is influenced between the media gateways. Therefore, the present invention reduces the range of influence of the link failure, lightens the extent of harm to the link failure, and improves the cumulative reliability of the multimedia communication.
Description
Technical field
The present invention relates to a kind of method that improves communication reliability, particularly a kind of logical medium passage that utilizes solves service quality (QoS) problem in the multimedia communication, guarantees the method for communication reliability, belongs to communication technical field.
Background technology
For a long time, voice, data, this three classes communication service of multimedia all are to be carried by different communication networks respectively.Along with the continuous development of technology, this three classes business has the trend that merges gradually.Can carry the Any user data message because present widely used IP network has the IP bag, it has created condition for realize that multiple information such as voice, data, media stream transmit in a bearer network.
Current, people are extensive use of VoIP (Voice over Internet Protocol) technology and soft switch (soft switch) technology for voice, data and multimedia service are provided simultaneously on IP network.These technology all be with IP network as the bottom bearer network, and adopt IP to wrap carrying media information, utilize the IP network media information between media gateway, the multimedia communication terminal.
In IP network, router (Router) is searched corresponding routing table according to the destination address in the IP bag, determines the transport address of next jumping (Next-Hop) then according to routing table.Because IP network has not connection-oriented characteristic, equipment such as media gateway and multimedia communication terminal are to the not control of transmission course of media information.In IP network, media information can have multiple Path selection in theory, but the application layer at media information place is given the IP layer with actual transmission paths and is finished, and the IP layer is then according to Routing Protocols such as OSPF, IS-IS, RIP, selects it to think that reasonable path transmits.Therefore, the Actual path of media information is determined according to the routing algorithm by router.In this case, media information generally all can be along same paths transmission.
Figure 1 shows that the process schematic diagram that existing media information transmits by media gateway and router.Media information between media gateway 1 and the media gateway 2 need pass through router one, router two and router four.
As shown in Figure 2, if the link occurs fault between router one and the router two, then the media information between media gateway 1 and the media gateway 2 can interrupt in a period of time, and break period may be between the several seconds to tens of seconds.After router one and router two were readjusted route, the media path between media gateway 1 and the media gateway 2 became new path, promptly passes through router one, router three, router two and router four.
The change in above-mentioned path is smaller to the influence of non-realtime traffic, generally can solve by upper retransmission mechanism.But for multimedia communication, influence can be bigger, tends to cause the interruption of multimedia communication.Especially between two jumbo media gateway, if cause most conversation, harm is equivalent to once serious communication accident.
Summary of the invention
The objective of the invention is to deficiency, propose a kind of logical medium passage that utilizes and solve service quality (QoS) problem in the IP-based multimedia communication, guarantee the method for communication reliability at existing IP network bearing multimedia business.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
A kind of method of utilizing the logical medium passage to improve the multimedia communication reliability is used in the IP network of bearing multimedia data, it is characterized in that:
Application layer at IP network is provided with at least one logical medium passage, the IP layer network path that can be used for transmitting multimedia messages in described logical medium passage and the described IP network forms mapping relations one to one, and adjust in real time according to the situation that described IP layer network path could be used, described multimedia messages transmits according to the IP layer network path that described logical medium passage is shone upon, and the application layer working load of described IP network is shared technology described multimedia messages is distributed to described logical medium passage.
Described IP layer network path is specified by static state or the mode of automatic network topology obtains.
Described IP network guarantees that by the source routing function all multimedia messagess of distributing to a certain logical medium passage transmit in described IP network along identical IP layer network path.
If a certain IP layer network path in the described IP network can not be used again, then in the application layer of described IP network, leave out the logical medium passage that this IP layer network path is shone upon.
In these cases, if also have idle IP layer network path in the described IP network, then correspondence generates at least one new logical medium passage in the application layer of described IP network.
In addition, in these cases, described IP network also can be reset described logical medium passage according to the situation in remaining IP layer network path.
The method of utilizing the logical medium passage to improve the multimedia communication reliability of the present invention is shared the multimedia communication between the media gateway on a plurality of logical medium passages.When some link occurs fault, between the media gateway only some session may be affected, therefore reduced the coverage of link failure, alleviated the extent of injury of link failure, improved the global reliability of multimedia communication.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
The process schematic diagram that Fig. 1 transmits by media gateway and router for existing media information.
The transmission course schematic diagram of media information when Fig. 2 breaks down for link.
Figure 3 shows that a specific embodiment that utilizes the logical medium passage to improve the method for multimedia communication reliability.
Embodiment
Because multimedia communication technologies such as at present widely-used VoIP and soft switch all are based on the IP network realization, and IP network itself adopts not connection-oriented working method, the IP bag of bearing multimedia information is easy to cause multimedia communication not smooth because factors such as link failure go out active.In order to address this problem, the present invention has introduced connection-oriented working method in IP-based multimedia communication, logical medium passage that employing is set up on application layer, connection-oriented is responsible for the transmission multimedia messages specially as the designated lane of the IP bag of bearing multimedia information.And, the situation of above-mentioned logical medium channel transfer multimedia messages is monitored, in case there is link to break down, then adjust the route setting of IP bag immediately, avoid the above-mentioned link that breaks down, guarantee the unimpeded of multimedia communication.
Logical medium passage recited above is not the media channel on the physical significance.It is actually a plurality of connections of setting up in the application layer of IP network, and these connection are mapped to respectively on the particular path of IP layer, thus make each logical medium passage all with the IP layer on particular path form one to one and concern.Transmit in the path that multimedia messages transmits in fact just on the IP layer that is shone upon by this logical medium passage by the logical medium passage.Because above-mentioned mapping relations are in logic, so the process of its foundation and cancellation is easy to realize.
The method of utilizing the logical medium passage to improve the multimedia communication reliability of the present invention realizes by following concrete steps:
1. the IP that determines bearing multimedia information wraps the network path that may pass through.
The network path here can be found by static state appointment or automatic network topology, thus the possible path between definite each media gateway and the bandwidth of every paths.For example among Fig. 1 through the network path of router one, router two and router four with through the network path of router three, router five.Above-mentioned static state is specified or is determined that by the automatic network topology technological means of network path is prior art fully, and for example employed ip route order is exactly to be used for specifying static routing specially in Internet, does not just describe in detail at this.
2. parameters such as network path that may pass through according to multimedia IP bag and corresponding bandwidth are set up the logical medium passage.
The front is mentioned, and the logical medium passage is that a logic of setting up in application layer connects, set up on the process nature of logical medium passage be exactly set up that application layer connects and above-mentioned network path between the process of mapping relations.In setting up the process of mapping relations, consider the influence of network path that IP bag may pass through and the relevant network bandwidth, guarantee that multimedia messages has enough network bandwidths as support when transmitting.
The logical medium passage of setting up comprises following descriptor:
Information source IP address;
Purpose IP address;
Logical medium passage 1{ available bandwidth; Average retardation; IP path description };
...
Logical medium passage n{ available bandwidth; Average retardation; IP path description };
3. be multimedia communication assignment logic media channel, and transmitting multimedia information.
If need to carry out media session between two media gateway, promptly need to transmit multimedia messages, this demand can successively be reflected to the application layer of network, at first the query logic media channel is for information about for application layer, and working load shares technology, selects logical medium channel allocation wherein to give this media session.Application layer passes to the IP layer with the IP path description (being mapping relations) of the logical medium passage of distribution, guarantees that by the IP layer media information in this media session process transmits according to predefined path.
Load balancing above-mentioned is a technological means commonly used in the existing network, has not just explained in detail at this.
It is to be noted, not all media session data is all walked same logical medium passage, working load of the present invention is shared the purpose of technology and with regard to being media session data is reasonably distributed according to the situation of logical medium path, guarantee that each IP bag all is assigned to separately and determine in many logical medium passages to distribute in that passage of oneself, transmit unblockedly.In addition, not exclusively fixing different with the transmission path of IP bag in the existing not connection-oriented IP network, when enforcement is of the present invention, also to use the source routing function that ICP/IP protocol is supported.Use this function, can guarantee that all IP bags of distributing to a certain logical medium passage use identical transmission path to transmit in IP network.This has just embodied the characteristics of introducing connection-oriented communication mode in not connection-oriented IP network of the present invention.
4. the logical medium passage is monitored, and dynamically the logical medium passage is adjusted according to the Network Transmission situation.
As previously mentioned, the main difference of the present invention and prior art is embodied in introduces connection-oriented logical medium passage in not connection-oriented IP network, be responsible for the transmission multimedia messages specially.Because the logical medium passage is connection-oriented, in media information, system can the transmission situation of real time monitoring media information in the logical medium passage, comprises the variation of average retardation and available bandwidth.When network breaks down or during the low layer link change, mean that the pairing logical medium passage of this link can not be used again, at this moment, this logical medium passage can be left out by system in the load balancing process, and promptly session data is no longer distributed to the pairing network path of this logical medium passage; Perhaps, utilize idle network path to regenerate a new logical medium passage again, give this new logical medium passage the session data allocations; Perhaps, redefine the mapping relations of the network path and the logical medium passage of IP layer, promptly regenerate new logical medium channel layout, the session data are distributed according to new logical medium channel layout.No matter take above-mentioned that a kind of measure, can guarantee that link failure can not cause influence of overall importance to whole network service.In addition, above-mentioned modification to the logical medium passage only need get final product in the mapping relations in application-level modifications logical medium Management Of Resources, Accesses ﹠ Network path.This point is very easy to realization, but also can be finished automatically by computer, does not need manual intervention fully.
Fig. 3 has provided a specific embodiment of the present invention, in order to the concrete application of explanation the inventive method.As shown in Figure 3.Set up 3 logical medium passages between media gateway 1 and the media gateway 2:
Logical medium passage 1 is through router one, router two and router four;
Logical medium passage 2 is through router one, router three, router two and router four;
Logical medium passage 3 is through router three and router five;
When the link occurs fault between router one and the router two, only logical medium passage 1 can be subjected to the influence of link failure, for example may interrupt session or cause quality of the conversation to descend; But logical medium passage 2 and logical medium passage 3 are all unaffected.At this moment, logical medium passage 1 can be deleted by system, and the session data are re-assigned on logical medium passage 2 and the logical medium passage 3; Also can revise logical medium passage 1, make it walk around link between the router one, 2 that breaks down, change and walk the link that router one, router three and router five form.
Though above described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and does not break away from spirit of the present invention, wishes that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (6)
1. a method of utilizing the logical medium passage to improve the multimedia communication reliability is used in the IP network of bearing multimedia data, it is characterized in that:
Application layer at IP network is provided with at least one logical medium passage, the IP layer network path that can be used for transmitting multimedia messages in described logical medium passage and the described IP network forms mapping relations one to one, and adjust in real time according to the situation that described IP layer network path could be used, described multimedia messages transmits according to the IP layer network path that described logical medium passage is shone upon, and the application layer working load of described IP network is shared technology described multimedia messages is distributed to described logical medium passage.
2. the method for utilizing the logical medium passage to improve the multimedia communication reliability as claimed in claim 1 is characterized in that:
Described IP layer network path is specified by static state or the mode of automatic network topology obtains.
3. the method for utilizing the logical medium passage to improve the multimedia communication reliability as claimed in claim 1 is characterized in that:
Described IP network guarantees that by the source routing function all multimedia messagess of distributing to a certain logical medium passage transmit in described IP network along identical IP layer network path.
4. the method for utilizing the logical medium passage to improve the multimedia communication reliability as claimed in claim 1 is characterized in that:
If a certain IP layer network path in the described IP network can not be used again, then in the application layer of described IP network, leave out the logical medium passage that this IP layer network path is shone upon.
5. the method for utilizing the logical medium passage to improve the multimedia communication reliability as claimed in claim 4 is characterized in that:
If also have idle IP layer network path in the described IP network, then correspondence generates at least one new logical medium passage in the application layer of described IP network.
6. the method for utilizing the logical medium passage to improve the multimedia communication reliability as claimed in claim 4 is characterized in that:
Described IP network is reset described logical medium passage according to remaining IP layer network path situation.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100738549A CN100394736C (en) | 2004-09-06 | 2004-09-06 | Improvement of multi-medium communication reliability by logic media |
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| CNB2004100738549A CN100394736C (en) | 2004-09-06 | 2004-09-06 | Improvement of multi-medium communication reliability by logic media |
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| CN1747435A CN1747435A (en) | 2006-03-15 |
| CN100394736C true CN100394736C (en) | 2008-06-11 |
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| CN110768816B (en) * | 2018-07-27 | 2022-04-15 | 成都鼎桥通信技术有限公司 | Multimedia service exception protection method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1380801A (en) * | 2001-04-12 | 2002-11-20 | 深圳市中兴通讯股份有限公司 | Mutual conversion method of line link load-sharing general and backup mode in digital communication system |
| WO2004002078A1 (en) * | 2002-05-17 | 2003-12-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Dynamic routing in packet-switching multi-layer communications networks |
| CN1496629A (en) * | 2002-01-17 | 2004-05-12 | ƽ | Load balancing for fast reroute backup tunnels |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1380801A (en) * | 2001-04-12 | 2002-11-20 | 深圳市中兴通讯股份有限公司 | Mutual conversion method of line link load-sharing general and backup mode in digital communication system |
| CN1496629A (en) * | 2002-01-17 | 2004-05-12 | ƽ | Load balancing for fast reroute backup tunnels |
| WO2004002078A1 (en) * | 2002-05-17 | 2003-12-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Dynamic routing in packet-switching multi-layer communications networks |
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Granted publication date: 20080611 Termination date: 20170906 |