CN101741828B - Domain control server-based sound image comprehensive control system - Google Patents
Domain control server-based sound image comprehensive control system Download PDFInfo
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Abstract
The invention discloses a domain control server-based sound image comprehensive control system. The system comprises one or more domains, wherein each domain comprises one or more domain control servers which are connected through a network; and each piece of terminal equipment is connected with the domain control server of the domain to which the terminal equipment belongs through the network. One or more routing positioning servers are also configured in the network and are used for timely receiving connection relationship configuration information transmitted by each domain control server in real time and performing routing calculation according to a certain algorithm to determine domain routing relationship and media routing paths of the whole network. The domain control server-based sound image comprehensive control system constructs a real sound image transmission network with a comprehensive communication protocol (SIP), an addressing mechanism (SIP addressing), a routing mechanism (SIP call routing and media routing) and open interconnection interfaces (the openness of the SIP protocol and a system) so as to realize the interconnection and communication of sound image systems of different environments, different systems and different protocols.
Description
Technical field
The present invention relates to a kind of acoustic image complex control system based on domain control server.
Background technology
Perfect day by day communication network is that the transmission of remote image and sound provides carrier; The maturation of the communication technology has solved the problems such as distance, intercommunication and bandwidth bottleneck in the audio and video information transmission course with development, makes the real-time remote transmission of image and acoustic information become possibility.The transmission of audio and video information is by the initial transmission developing into of broadcast type signal current twocouese, networking, interactive mode, multi-functional, comprehensive acoustic image transmission system.Based on the acoustic image transmission system of synthesization, it is professional that we can carry out the acoustic image of numerous forms such as video conference, video monitoring, visible dispatching, visual commander, remote teaching, for our work and life brings more convenient and efficient.Though comparatively extensive use is used in the transmission of video image; Yet restricted by the historical conditions of network technical development; The real-time Transmission of video/audio on network lacks ripe and complete condition all the time; Thereby cause the realization mechanism of these systems chaotic, and do not have unified standard and can comply with, various informative and incompatible.So, can't be interconnected between the different system, image can't intercommunication, and the image between the departments at different levels can't call each other, and equipment can't be controlled each other, finally forms " isolated island " of audio and video information one by one.Therefore; It is current that what press for most is that unified transmission standard and interconnected mechanism are set up in the networking of video image and audio frequency transmission; And effectively solve the transmission control of automation and the problem of network management; Network environment that is similar to the acoustic image resource interconnectivity and sharing of Internet of real realization accomplishes to obtain in real time all kinds of audio and video informations in the network whenever and wherever possible, " unblocked ".
Summary of the invention
The purpose of this invention is to provide a kind of acoustic image complex control system based on domain control server; It comprises one or more territory; Each territory comprises one or more domain control servers; Each domain control server links to each other through network, and each terminal equipment links to each other with the domain control server in territory separately through network.
Said network be one independently based on the network of TCP/IP host-host protocol or by the interconnected internet that constitutes of a plurality of subnets.
Also dispose one or more route location-servers in the said network; Said route location-server is positioned at the center of entire domain network configuration; It receives the annexation configuration information that each domain control server sends in real time in good time; Carry out route according to certain algorithm and calculate, confirm the territory routing relation and the medium routed path of whole network.
Because it based on domain control server formative region networking structure and medium routing capabilities, can realize " confirm signal source and signal target, can transparently set up the acoustic image transmission interchange channel between this source and target, the acoustic image between realizing at 2 transmits ".As long as the path can reach, format compatible or convertible, then no matter which kind of position signal source, signal target are in, use which kind of transmission means in principle in this transmission, and transmission all can transparently be carried out.In this sense; What it was constructed is " an acoustic image transmission network " truly; The same as computer TCP/IP network; Communication protocol (SIP), addressing mechanism (SIP addressing), routing mechanism (SIP calls out route and medium route) on the complete meaning are arranged, have open interconnecting interface (opening of Session Initiation Protocol and system, the opening of module in the platform); Standardized authentication and controling mechanism are then arranged, can realize the interconnecting of acoustic image system of varying environment, different system, different agreement.
Description of drawings
Fig. 1 is not for comprising the system principle sketch map of route location-server;
Fig. 2 is the system principle sketch map that comprises the route location-server;
Fig. 3 is system's control flow principle schematic;
The schematic flow sheet of Fig. 4 for " calculating the aiming field Control Server that call request should be forwarded to " in system's control flow;
Fig. 5 is inferiorization of the relaxed layer networking structural principle sketch map in territory;
Fig. 6 is the audio and video information annexation signal between a plurality of territories;
Fig. 7 is the networking call instance behind the introducing route location-server;
Fig. 8 is a domain control server structural principle sketch map.
Wherein: 1, business interface layer 2, authentication service module 3, SIP outgoing call proxy service module 4, SIP registration service module 5, SIP redirect services module 6, medium route control logic module 7, sip terminal analog logic module 8, territory Configuration Manager 9, non-standard SIP acoustic image system interface
Embodiment
In the network interconnection environment of a complicacy, we can be divided into some territories (domain) with this network usually.The basic conception in territory is: through the network element that locus, compass of competency or function logic is identical and close, from logic they being organized together, form a territory; Territory administrative mechanism through certain is carried out logic manage to them, forms a relatively independent network component units.
In our audio and video information Comprehensive Control platform network system, the set that a department, mechanism or acoustic image application system are managed, related audio/video devices, transmission channel and central apparatus formed is represented in territory usually.For example; Command centre of Department of Public Security of Shanxi Province has managed the video conferencing system of two cover IP based networks; An one cover simulation video monitoring system and a cover are based on the image delivering system of matrix; So, if we these systems from being organized as the NE of an audio and video information Comprehensive Control platform in logic, a Here it is territory.Be distributed on the structure principle in territory, can constitute incidence relation between any two territories and the territory.But too complicated territory incidence relation can cause managing chaotic, is unfavorable for Network Management.Therefore the architecture in territory is organized into level shape structure (tree), and this can not only satisfy managerial needs, also meets the actual organization's structure of public security system simultaneously.
Sip terminal refers to abide by video, the voice frequency terminal equipment of RFC3261 consensus standard design, for example video conference terminal, video server equipment, character matrix, video telephone etc.Sip terminal should be stipulated by the RFC3261 agreement; The action treatment mechanism of the SIP INVITE of support standard, ACK, OPTIONS, REGISTER, BYE and CANCEL request and agreement; Support SDP media description and negotiation; For this platform the ability of special support, the sip terminal that needs to use these special abilities should possess the support of SIP expansion, but this is optional rather than necessary.Actual this platform of media delivery mechanism is not arranged by force, but from the consideration of interconnecting property, media delivery should be selected following agreement as far as possible:
RTP/RTCP: be used for real-time media transmission (like application such as video conference, monitoring in real time)
RTSP: be used for transmission of multimedia streams and location (application such as checking) like video request program, video recording
Analog image virtual transmission agreement (AGVP): the transmission of analog image and digital network are irrelevant, and this agreement has only defined the exchange requirement of analog image transmission, and concrete transmission is accomplished through control analog image switching equipment.As Extended Protocol, the standard sip terminal is optional to the support of this agreement.
The data format of medium is the MPEG-4/H.264 of choice criteria as far as possible also.
Owing to must consider full compatibility to different acoustic image application systems, require transmission control protocol, one side is the current system environments of compatibility effectively, also has good autgmentability on the other hand, and this is that whole flat is built the technical problem of core the most.(Session Initialization Protocol, conversation initialized protocol RFC3261) are a kind of agreement that can satisfy this application need to SIP.Current, Session Initiation Protocol has become the de facto standard of realizing multimedia transmission control based on the IPv4/IPv6 network, and products such as a large amount of IP phones, video conference, video server are all supported this agreement; A new generation the 3G mobile communications network, also with Session Initiation Protocol as the core technology that multimedia service is provided in the IP Multimedia System; Simultaneously, Session Initiation Protocol also is the accepted standard communication protocol of recommending in Ministry of Public Security's " requirement of supervision of the cities alarm network system current techique ".This agreement well-known architecture and outstanding extended capability make its standard that can be consistent in field of multimedia communication, can carry out special case processing and expansion/expansion to different situations again.
The conversion of non-standard à standard Session Initiation Protocol and level of abstraction are realized: in a large number based on the acoustic image application systems of digitlization transmission, its transmission control protocol is not based on the standard Session Initiation Protocol for existing.Based on early stage multimedia communication international standard agreement H.323 these systems have, and more have in a large number based on the self-defined host-host protocol of manufacturer.Solve the compatibility of nonstandard protocol application system to standard Session Initiation Protocol audio and video information Comprehensive Control platform, we can introduce an intermediate layer (mainly realizing with software or dedicated gateway equipment).This intermediate layer is abstracted into the standard sip terminal with each Terminal Type of these application systems, to platform standardized transmission control interface is provided; The inner conversion that realizes controlling to the specific transmission control mode relevant with system by the SIP transmission.This mechanism can make the user of platform need not to be concerned about the concrete way of realization of particular system; Without exception with the audio and video information terminal in the platform (video source, audio-source, video object, audio frequency target etc.) the unified sip terminal that is regarded as standard, the control that conducts interviews of the Session Initiation Protocol through standard.
The conversion of simulation and other form acoustic image host-host protocol à standard Session Initiation Protocol and level of abstraction are realized: the realization principle of this layer is with " conversion of non-standard à standard Session Initiation Protocol and level of abstraction are realized "; Through introducing an intermediate layer; With the audio and video information terminal of simulation abstract be the sip terminal of standard, and then can adopt the control that conducts interviews of the Session Initiation Protocol of standard.Be that with the application system difference of digitlization transmission means simulated sound can't directly be transmitted to digital transport network as the video of application system, and the SIP application system all is to be directed against digitlization video/audio media format in principle.
Addressed this problem dual mode, and dual mode can be used simultaneously:
The first, partly to expand/redefine through media description Session Initiation Protocol, as the transmitting SIP terminal, its media delivery form is specific, special-purpose form to agreement for the simulated sound that takes out, and does not support the compatibility with the digitlization transmission.Like this, the transmission of simulated sound picture only is supported in simulated sound as carrying out in the transmission network.In fact, this application is very general.For example, based on the supervision of the cities video of analogue transmission, our typical demand is that the video image with the different location switches on certain monitor through the analogue transmission network and checks.
The second, to whole flat definition audio and video information routing architecture, with the route access point of " analog to digital " conversion equipment (like Video Codec, video server etc.) as analog to digital, and with this conversion equipment abstract equally be sip terminal.Digitized sip terminal such as need are directly visited pseudo-terminal, through the route converting system of platform, can access process be divided into two big links: the first, and the exchange of analog video network portion makes the audio and video information of pseudo-terminal accurately exchange to conversion equipment; The second, control transformation equipment is based on the digital audio and video information of SIP host-host protocol after digitalized S IP terminal provides conversion.
As shown in Figure 8; Domain control server comprises based on the business interface layer 1 of standard RFC3261 Session Initiation Protocol stack, authentication service module 2, SIP outgoing call proxy service module 3, SIP registration service module 4, SIP redirect services module 5, medium route control logic module 6, sip terminal analog logic module 7, territory Configuration Manager 8 and non-standard SIP acoustic image system interface 9; Wherein standard RFC3261 Session Initiation Protocol stack receives the standard RFC3261 Session Initiation Protocol data of automatic network; Business interface layer 1 is accomplished the analysis of data and is converted the concrete call instruction to said authentication service module 2, SIP outgoing call proxy service module 3, SIP registration service module 4, SIP redirect services module 5, medium route control logic module 6, sip terminal analog logic module 7, non-standard SIP acoustic image system interface 9 to; The support that territory Configuration Manager 8 is accomplished SIP redirect services module 5, medium route control logic module 6, sip terminal analog logic module 7; SIP outgoing call proxy service module 3 is carried out authentication based on authentication service module 2, and sip terminal analog logic module 7 is controlled each terminal according to the interface that non-standard SIP acoustic image system interface 9 provides.
Said business interface layer 1 also will receive the control signal from figure control interface.
Its control method may further comprise the steps:
The first step, the terminal equipment initialization;
In second step, accomplish the registration of terminal equipment by SIP registration service module;
In the 3rd step, call out according to the RFC3261 agreement by the completion of SIP outgoing call proxy service module;
In the 4th step, judge the connection type between terminal equipment;
The 5th step; According to the digital terminal between terminal equipment to digital terminal or pseudo-terminal to pseudo-terminal or digital terminal to pseudo-terminal or pseudo-terminal are interrupted the calling of classifying of four kinds of different connection types to numeral.
Be the basis with the territory basic model, the SIP multistage agency mechanism of a plurality of domain control servers with the RFC3261 agreement associated, can constitute the territory networking structure of this platform.Fig. 1 has showed a territory network configuration that is made up of 5 territories, tertiary levels.A kind of acoustic image complex control system based on domain control server; It comprises one or more territory; Each territory comprises one or more domain control servers, and each domain control server links to each other through network, and each terminal equipment links to each other with the domain control server in territory separately through network.Said network be one independently based on the network of TCP/IP host-host protocol or by the interconnected internet that constitutes of a plurality of subnets.
Territory networking structure shown in Figure 1 is made up of 5 territories, tertiary level structure.1 is first order domain control server; 2,3 is second level domain control server, is under the jurisdiction of 1 on the hierarchical relationship; 4 and 5 is third level domain control server, and 4 are under the jurisdiction of 2,5 and are under the jurisdiction of 3 on the hierarchical relationship.The internal structure of each domain control server all meets ... Standard.Fig. 1 also comprise two sip terminals (numeral or the simulation all can): 1001 are under the jurisdiction of 1 grade of domain control server 1,2001 is under the jurisdiction of 3 grades of domain control servers 5.
Fig. 1 representative be a representative network structure, in fact, the domain control server of each grade all can be 1 or many, forms distributed control structure.
When sip terminal 1001 will call out 2001; Session Initiation Protocol calling procedure by standard; 1001 terminals send to the outgoing call proxy module of domain control server 1 under it with its call request, and 1 outgoing call proxy module finds that through Route Selection this call request should be forwarded on the domain control server 3; In like manner; Domain control server 3 passes through Route Selection; With this Call Transfer to domain control server 5, domain control server 5 finds target through registration service then, and the calling procedure of pressing between the defined terminal of domain control server is accomplished the call request to terminal 2001.
The flow process of this process is as shown in Figure 3.
How does domain control server 1 know accurately that the call request to terminal 2001 should be forwarded to domain control server 3, rather than is forwarded to domain control server 5 in this process?
A simple strategy is the stratification relation according to the territory, promptly infers through the domain name relation.
In this territory networking blueprint model, each territory all requires to be provided with the domain name that meets the Internet DNS system, for example domain1.com.The subordinate territory in a territory, the name of its domain name should be followed the form of prefixing on the basis of higher level's domain name, and for example called after subdomain2.domain1.com is answered in the subordinate territory of domain1.com.By that analogy.
Each terminal in the territory, its complete name form is < terminal name>< domain name that is subordinate to >.Like the terminal in Fig. 1 example 1001, if the domain name of the domain control server that it was subordinate to is domain1.com, the complete called after 1001domain1.com at terminal then; In like manner, terminal 2001, if the domain name of the domain control server that is subordinate to is sub5.subdomain3.domain1.com, the complete called after 2001sub5.subdomain3.domain1.com at terminal then.
When 1001 called out 2001, domain control server 1 can infer immediately that through the complete name (2001sub5.subdomain3.domain1.com) of the target terminal 2001 of analysis 1001 callings the most contiguous territory is subdomain3.domain1.com.This strategy is realized simple, if network configuration is strict stratification relation, should strategy also be accurately and reliably then.Yet if network configuration is the hierarchical model like the non-strictness of Fig. 5, it is insecure utilizing this strategy to infer.2 grades of domain control servers 3 and 6 are all the higher level territory of third level domain control server 4 among Fig. 5, and arrow is represented membership among Fig. 5.In the network of such hierarchical structure, domain control server 1 can't infer that 1001 call out the forwarding target of call request in 2001 o'clock according to domain name.
This programme adopts another kind of reliable strategy: utilize the route location-server.Also dispose one or more route location-servers in the network; Said route location-server is positioned at the center of entire domain network configuration; It receives the annexation configuration information that each domain control server sends in real time in good time; Carry out route according to certain algorithm and calculate, confirm the territory routing relation and the medium routed path of whole network.
Domain control server can be configured the equipment connecting relation of all acoustic image application systems of this territory.
Each domain control server is through " territory configuration management " function; Equipment connecting relation in configurable this territory; In domain1.hnga.gov.cn; The sip terminal 1000domain1.hnga.gov.cn (corresponding analog video camera) of simulation is connected to video matrix 1, and video matrix 1 is connected to video matrix 2, and 2 of video matrixs are connected to domain2.hnga.gov.cn through communication link (like optical transceiver equipment).In like manner, domain2.hnga.gov.cn, domain3.hnga.gov.cn and domain4.hnga.gov.cn all can be configured its annexation.Undoubtedly, through these annexations of analysis-by-synthesis, we can derive the routing relation of network:
The domain1.hnga.gov.cn domain2.hnga.gov.cn that can go directly
Domain1.hnga.gov.cn can arrive domain4.hnga.gov.cn through domain2.hnga.gov.cn
The domain3.hnga.gov.cn domain4.hnga.gov.cn that can go directly
Domain1.hnga.gov.cn can not arrive domain3.hnga.gov.cn
Domain2.hnga.gov.cn can not arrive domain3.hnga.gov.cn
Simultaneously, we can also derive between each sip terminal and want images, the medium routed path of required experience.For example want images between 1000domain1.hnga.gov.cn and the 4000domain4.hnga.gov.cn, then must arrive 4000domain4.hnga.gov.cn through the exchange of " video matrix 1 ", the exchange of " video matrix 2 ", the exchange of " video matrix 3 ", the coding of SIP encoder (2001domain2.hnga.gov.cn).
For realizing this automatic routing relation derivation, in the platform system, be provided with " route location-server ".The route location-server is positioned at the center of entire domain network configuration; Each domain control server need connect in real time and concern that configuration information sends to the route location-server; Route calculating is carried out according to certain algorithm in route location-server inside, confirms the territory routing relation and the medium routed path of whole network.The status of route location-server in this platform is as shown in Figure 2.
In large-scale network configuration, for alleviating the operating pressure of route location-server, the route location-server can adopt the distributed synchronization reproduction technology, and multiple servers is accomplished through trooping.
Rely on the route location-server, in the calling procedure flow chart under the interconnected pattern of domain control server, the particular procedures of " calculating the aiming field Control Server that call request should be forwarded to " such as Fig. 4 flow chart description.
The routing forwarding of call request: by the route location-server, when the target sip terminal of certain calling of outgoing call agent discovery of domain control server does not belong to this territory, inquire about the route location-server immediately, transmit target with the next one of confirming this call request.Medium route in the calling procedure is according to the realization details definition of domain control server, and when domain control server did not dispose the medium routing relation, sip terminal of different nature was called out and will be failed.Through introducing the route location-server; SIP outgoing call proxy module in the domain control server can be inquired about the medium routed path of required experience between two terminals; If the path is feasible; Then SIP outgoing call agency will set up the medium routed path for calling procedure, if necessary, possibly carry out the reorientation that SIP calls out.
Territory relation for example shown in Figure 7, sip terminal 4000domain4.hnga.gov.cn need call out 1000domain1.hnga.gov.cn, and its process is:
4000domain4.hnga.gov.cn send call request (target: 1000domain1.hnga.gov.cn) act on behalf of to the outgoing call of domain4.hnga.gov.cn;
The outgoing call agents query route location-server of domain4.hnga.gov.cn, clearly next target of route to domain1.hnga.gov.cn is domain2.hnga.gov.cn, therefore, call request is forwarded to domain2.hnga.gov.cn;
The outgoing call agency of domain2.hnga.gov.cn receives call request, inquiry route location-server, and clearly next target of route to domain1.hnga.gov.cn is domain1.hnga.gov.cn;
The outgoing call agents query route location-server of domain2.hnga.gov.cn; Media delivery form that discovery 4000domain4.hnga.gov.cn is required and the media delivery form of 1000domain1.hnga.gov.cn are inconsistent, therefore need confirm its medium routed path through the route location-server;
Domain2.hnga.gov.cn prepares to set up the medium routed path, continues simultaneously call request is forwarded to domain1.hnga.gov.cn;
Domain1.hnga.gov.cn finally is forwarded to 1000domain1.hnga.gov.cn by identical call logic with call request, and the media consultation process of 1000domain1.hnga.gov.cn confirms to set up the switching (video matrix 1, video matrix 2) of analog matrix;
Domain2.hnga.gov.cn is after the media negotiation success of confirming 1000domain1.hnga.gov.cn, and that sets up video matrix 3 switches to the SIP encoder;
Domain2.hnga.gov.cn replys and replys 4000domain4.hnga.gov.cn, informs to call out to be redirected to 2001domain2.hnga.gov.cn;
4000domain4.hnga.gov.cn rebulid the calling of 2001domain2.hnga.gov.cn; Digital Media transmission means by standard obtains video from 2001domain2.hnga.gov.cn, and video at this moment promptly is the video of 1000domain1.hnga.gov.cn.
This shows that through introducing the route location-server, whole audio and video information Comprehensive Control platform has truly been realized interconnecting of different acoustic image networks!
In addition, though said process is very complicated, these work are all accomplished by domain control server and route location-server automatically, and as the user, these details are fully transparent.
What it was constructed is a calling Control Network that meets RFC3261 SIP standard fully; The network addressing of any complicacy, route details are by the core of platform: domain control server, route location-server etc. are accomplished automatically; The user is when using this platform; Need not to understand these details, only need to confirm signal source, signal target, send signal source/target and call out to the SIP in signal target/source and get final product.The result who calls out has only two kinds of definite results: success, perhaps failure.If we call equally these through communication network, though the inside realization mechanism of communication network is very complicated, we use phone is so simple: only need dial destination number, and result or be to dial success, or dial failure.
Measured Session Initiation Protocol; Any one sip terminal equipment (for example SIP video telephone set) or SIP software terminal (the for example soft video telephone of SIP); After signing in to this platform through authentication, can on platform network, call out any acoustic image target, no matter these targets are real sip terminals; Still simulation camera, an or video encoder.Really, it is exactly so simple that the user manipulates!
Claims (2)
1. the acoustic image complex control system based on domain control server is characterized in that it comprises a plurality of territories, and each territory comprises one or more domain control servers, and each domain control server links to each other through network;
Said domain control server comprises based on the business interface layer of standard RFC3261 Session Initiation Protocol stack, authentication service module, SIP outgoing call proxy service module, SIP registration service module, SIP redirect services module, medium route control logic module, sip terminal analog logic module, territory Configuration Manager and non-standard SIP acoustic image system interface; Wherein, SIP registration service module is accomplished the registration of terminal equipment; Standard RFC3261 Session Initiation Protocol stack receives the standard RFC3261 Session Initiation Protocol data of automatic network; The business interface layer is accomplished the analysis of data and is converted the concrete call instruction to said authentication service module, SIP outgoing call proxy service module, SIP registration service module, SIP redirect services module, medium route control logic module, sip terminal analog logic module, non-standard SIP acoustic image system interface to; The territory Configuration Manager is accomplished the support to SIP redirect services module, medium route control logic module, sip terminal analog logic module; SIP outgoing call proxy service module is carried out authentication based on the authentication service module; The calling that completion is carried out according to the RFC3261 Session Initiation Protocol, sip terminal analog logic module is controlled each terminal equipment according to the interface that non-standard SIP acoustic image system interface provides;
Said a plurality of domain control server associates with the multistage agency mechanism of SIP of RFC3261 Session Initiation Protocol agreement, constitutes the territory networking structure of native system;
Said a plurality of territory is divided into hierarchical structure; Form three grades of territories altogether; The Control Server in subordinate territory wherein; The Control Server that on hierarchical relationship, is subordinate to the higher level territory, each terminal equipment links to each other with the domain control server in territory separately through network, and each domain control server is configured the equipment connecting relation of all acoustic image application systems of this territory;
Also dispose one or more route location-servers in the said network; Said route location-server is positioned at the center of entire domain network configuration; It receives the annexation configuration information that each domain control server sends in real time, carries out route according to certain algorithm and calculates, and confirms the territory routing relation and the medium routed path of whole network; Wherein the route location-server adopts the distributed synchronization reproduction technology, and multiple servers is accomplished through trooping.
2. a kind of acoustic image complex control system as claimed in claim 1 based on domain control server, it is characterized in that said network be one independently based on the network of TCP/IP host-host protocol or by the interconnected internet that constitutes of a plurality of subnets.
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| CN104954764A (en) * | 2015-07-21 | 2015-09-30 | 上海远哲电子技术有限公司 | Video monitoring system based on video resource safety gateway |
| CN110443449B (en) * | 2019-07-02 | 2022-05-13 | 烽火通信科技股份有限公司 | Optical fiber path back calculation method and system |
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| CN1635750A (en) * | 2003-12-29 | 2005-07-06 | 清华大学－中国华录信息技术研究所 | A method of mobility management in mobile communication system |
| CN101465788A (en) * | 2007-12-21 | 2009-06-24 | 华为技术有限公司 | Method and device for intercommunication of routes between various domain, and route calculation unit |
-
2009
- 2009-08-07 CN CN2009100440462A patent/CN101741828B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1635750A (en) * | 2003-12-29 | 2005-07-06 | 清华大学－中国华录信息技术研究所 | A method of mobility management in mobile communication system |
| CN101465788A (en) * | 2007-12-21 | 2009-06-24 | 华为技术有限公司 | Method and device for intercommunication of routes between various domain, and route calculation unit |
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| CN101741828A (en) | 2010-06-16 |
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