CN1791213A - Mobile video order service system with optimized performance and realizing method - Google Patents
Mobile video order service system with optimized performance and realizing method Download PDFInfo
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Abstract
The mobile VOD business system with super performance based on GPRS mobile network comprises: besides traditional net element, a CCCP server on boundary of GGSN and PDN to release load for SCS and reduce bandwidth consumption between GGSN and SGS, a UECP server arranged in BSS that is between BSC and BTS to self-adaptive improve buffer hit rate based on buffer alternative strategy and ensure fast response to most user request, and a high-speed IP DL between CCP and UECP to transmit flow media content and construct two-stage buffer device with two proxy servers to bypass great media and reduce data flux and load for other link and eliminate the effect of VOD to network performance.
Description
Technical field
The present invention relates to a kind of mobile video order service system and implementation method of performance optimization, exactly, relate to a kind of mobile video order service system and implementation method, belong to the mobile communication network technology field relevant with mobile flow medium service based on GPRS mobile network, performance optimization.
Background technology
The mobile video order VoD (Video on Demand) that utilizes portable terminal to carry out is a kind of important mobile data services, and it has satisfied the demand that the mobile subscriber watches video frequency program whenever and wherever possible, and huge market potential is arranged.At present, China Mobile in Shanghai, provinces and cities such as Zhejiang, Fujian use general packet radio service gprs (General Packet Radio Service) network that the mobile video order business is provided.
GPRS network is a kind of 2.5 third generation mobile communication networks, it is on the basis of present GSM mobile communications network, mainly supports two kinds of network element entities realizations of node GGSN (Gateway GPRS Support Node) by increasing GPRS service support node SGSN (Serving GPRS Support Node) and GPRS gateway.The GPRS network main feature is to support middle and high speed data transmission, and the message transmission rate of 9.05～171.2kbit/s can be provided to each user.SGSN is that when activating gprs service, SGSN sets up a mobile management environment, comprises about the mobility of this mobile terminal MS and the information of fail safe aspect for mobile terminal MS provides professional node.The main effect of SGSN is the current location information of record travelling carriage, and finishes the transmission and the reception of mobile packet data between travelling carriage and SGSN.It is gateway that GGSN mainly acts on, and is used to connect multiple different data network; GGSN storage gprs service user's routing iinformation, and utilize tunneling technique to send to the current Service Access point of MS, i.e. SGSN protocol Data Unit PDU (Protocol Data Unit) according to this information.
Existing mobile video order system comprises following several sections: GPRS network, streaming medium content server S CS (Streaming Content Server), WAP portal website and user terminal MS.Wherein GPRS network is used for the transport stream media content; Streaming medium content server S CS is used to deposit the multimedia programming content of being made in advance by content supplier; WAP portal website is a WAP server that directory service is provided, and leaves information such as the brief introduction of program on each streaming medium content server and chained address URL concentratedly; Portable terminal must be 2.5G mobile phone or the PDA with GRPS function, and in order to support streaming media service, terminal also needs to install the playout software of supporting respective streams media content codec format (as H.264) and control protocol (as RTSP).
Usually, a complete VoD operation flow comprises the steps:
(1) mobile subscriber selects own interested content by the WAP portal website of the WAP browser access streaming media service of terminal by browsing the program introduction;
(2) title of request program is desired in user click, the chained address URL of programme content is fed back to the WAP browser of terminal;
(3) the WAP browser is by the DST PLAYER program on the interrelational form startup terminal;
(4) DST PLAYER connects to corresponding streaming medium content server S CS request according to the URL of program;
(5) after the streaming medium content server is admitted this connection, provide continuous flow-medium performance content to the user, and monitoring mobile subscriber's RTCP Real-time Transport Control Protocol;
(6) transmission of GPRS network carrying programme content and control protocol;
(7) after the user receives program stream, at first carry out buffer memory, wait cache contents to reach and begin broadcast program after a certain amount of; And service is controlled by RTCP Real-time Transport Control Protocol.
(8) during playing programs, the user sends the interactive operation of realization of RTSP protocol massages and server by playout software.
In the execution in step framework of above-mentioned VoD business, there are some performance bottlenecks:
(1) service delay is bigger: be mainly reflected in GPRS backbone network underlying protocol and be not suitable for the transmission of real-time continuous type streaming media service, the actual tunnel protocol GTP (GPRS Tunnel Protocol) that adopts has increased the transmission delay of Media Stream;
(2) network bandwidth consumption is big: the transmission rate of single medium stream should be not less than 20Kbps, and multi-user's online meeting simultaneously causes big flow attack to the GPRS core net;
(3) the concurrent user's quantity that can carry of core net is less: service performance descended bigger when the multi-user was simultaneously online.
Therefore how to solve performance issue, become a technical problem that presses for solution based on the above-mentioned mobile video order appearance of GPRS network.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of mobile video order service system and implementation method, thereby solve the various performance bottlenecks that mobile video order occurs on the present GPRS network preferably based on GPRS mobile network, performance optimization.
In order to achieve the above object, the invention provides a kind of mobile video order service system of performance optimization, comprise at least: each network element in GPRS network and this network: moving exchanging center MSC, GPRS service support node SGSN, GPRS gateway are supported node GGSN, streaming medium content server S CS, WAP portal site server, base station system BSS and customer mobile terminal MS; It is characterized in that: described system also comprises:
Central cache is acted on behalf of CCP (Central Cache Proxy) server, being arranged on the GPRS gateway supports on the border of node GGSN and external packets data network PDN (Packet Data Networks), be used to alleviate the business load of SCS, reduce the network bandwidth consumption between GGSN and the SCS, improve the response speed of video request program;
User border caching agent UECP (User Edge Cache Proxy) server, be arranged among each base station system BSS, promptly be arranged between each base station exchange controller BSC and each base station BTS, has adaptive cache ability based on cache replacement policy, by improving cache hit rate, guarantee the quick response of user video order request;
The High Speed IP direct connected link, be arranged between CCP server and each the UECP server, be used between transport stream media content, and by this with the two-level cache device of described two class acting servers formation streaming medium content in whole system, thereby the programme content Streaming Media that bypass is a large amount of, obviously reduce the data traffic of other link and handle load, reduce, eliminate the influence of VOD service network performance.
It is to be provided with one at least in each public land mobile net PLMN (PublicLands Mobile Network) that described central cache is acted on behalf of the CCP server, and its configurable number amount depends on the business demand amount.
Described central cache is acted on behalf of the function that the CCP server finishes and is further included:
Monitor real-time streaming protocol RTSP (Real Time Streaming Protocol) message, again itself and program request ranking list are mated: monitor the RTSP message between GGSN and the SCS, intercepting is also resolved the RTSP request message, extract the uniform resource position mark URL of program, again with the program request ranking list on the URL coupling CCP; If the match is successful, then stop this request message, and reply portable terminal by GGSN with the RTSP message of correspondence, extract programme content in the warehousing of postponing then and use realtime transmission protocol RTP (Real TimeTransport Protocol) to send to portable terminal through the IP direct connected link; Otherwise, transmit this RTSP request message to SCS;
The monitoring of realtime transmission protocol RTP Media Stream, transmission and buffer memory are replaced: monitor and intercept the RTP Media Stream of SCS to GGSN, the programme content that satisfies cache replacement policy is intercepted and captured and is kept in its buffer memory storehouse, use the programme content from SCS or buffer memory storehouse Real-time Transport Protocol to send to the user again;
Make CCP program request ranking list: according to the cycle of setting, the play-on-demand program situation is added up or the play-on-demand program situation that each UECP reports is carried out tabulate statistics, and the program request ranking list of making CCP according to the seniority among brothers and sisters criterion.
The software control module that described central cache is acted on behalf of in the CCP server includes:
RTSP packet filtering and forwarding module: monitor the RTSP message between GGSN and the SCS, intercepting is also resolved the RTSP request message, extract the uniform resource position mark URL of program, reply the program request ranking list RTSP message that the match is successful then, transmit the program request ranking list and mate unsuccessful RTSP message;
The ranking list matching module: according to the URL of request program, the program request ranking list in the inquiry memory module is carried out the program coupling; If the match is successful, then indication " the RTP Media Stream is monitored and transport module " is taken out programme content and is sent to the user from memory module; Otherwise, then return the coupling unsuccessful outcome to " RTSP packet filtering and forwarding module ";
Statistical analysis module: the CCP program request ranking list that completes, and deposit it in memory module;
Memory module: be used to store CCP program request ranking list and go into the whole of list program or the beginning part content;
The RTP Media Stream is monitored and transport module: monitor and intercept the RTP Media Stream of SCS to GGSN, and the media stream content of notifying buffer memory replacement module will satisfy cache replacement policy is stored in memory module; Be responsible for using what intercept Real-time Transport Protocol to send to the user from the programme content of SCS or the programme content of memory module through the IP direct connected link.
Buffer memory is replaced module: the programme content that will satisfy cache replacement policy is kept in the memory module, replaces the old programme content that has not satisfied cache replacement policy.
The function that described user border caching agent UECP server is finished further includes:
Monitor real-time streaming protocol RTSP message, again itself and program request ranking list are mated: monitor the RTSP message between BTS and the BSC, intercepting is also resolved the RTSP request message, extracts the uniform resource position mark URL of program, again with the program request ranking list on the URL coupling UECP; If the match is successful, then stop this request message, and reply portable terminal by BTS with the RTSP message of correspondence, extract programme content in the warehousing of postponing then and send to portable terminal; If coupling is unsuccessful, then transmit this RTSP request message to BSC;
The monitoring of realtime transmission protocol RTP Media Stream, transmission and buffer memory are replaced: receive from the RTP Media Stream of CCP and be transferred to BTS, and the programme content that will satisfy cache replacement policy is kept in its buffer memory storehouse; In the caching process process, preferentially adopt the head buffer memory, to make full use of the limited storage capacity of UECP;
Make UECP program request ranking list: according to the cycle of setting, the play-on-demand program situation is added up, make the program request ranking list of UECP according to ranking criterion, and statistical information is reported CCP; Perhaps UECP receives the program request ranking list of CCP synchronously, as the program request ranking list of oneself.
Described head buffer memory is the beginning partial content that is stored into the list program, with the startup time-delay that reduces user's request program-from sending order request to the time difference of seeing the first frame picture, to make full use of the memory space in UECP buffer memory storehouse;
Software control module in the caching agent UECP server of described user border includes:
RTSP packet filtering and forwarding module: monitor the RTSP message between BTS and the BSC, intercepting is also resolved the RTSP request message, extracts the uniform resource position mark URL of program, transmits the RTSP message that the match is successful;
The ranking list matching module: according to the URL of request program, the program request ranking list in the inquiry memory module is carried out the program coupling; If the match is successful, then indication " RTP media flow transmission module " is taken out programme content and is sent to the user from memory module; Otherwise, then return the coupling unsuccessful outcome to " RTSP packet filtering and forwarding module ";
Statistical analysis module: the UECP program request ranking list that completes, and deposit it in memory module, regularly report statistical information to CCP;
Memory module: be used to store UECP program request ranking list and go into the whole of list program or the beginning part content;
RTP media flow transmission module: receive from the RTP Media Stream of CCP and be transferred to BTS, and the notice buffer memory is replaced the program stream content that module will satisfy cache replacement policy and is kept in the memory module; Accept the indication of ranking list matching module, the programme content that the match is successful is taken out and send to the user from memory module;
Buffer memory is replaced module: the programme content that will satisfy cache replacement policy is kept in the memory module, replaces the old programme content that has not satisfied cache replacement policy.
The core data table that described play-on-demand program ranking list is the CCP/UECP server maintenance, it is made up of a series of records, every record corresponding a program in the list, article one, record is made up of several entries, these entries include but not limited to URL, access address, the program price of program in memory module of program code, programm name, program brief introduction, program, and the size of ranking list depends on the buffer memory capacity of CCP/UECP server.
The content of described cache replacement policy is: if certain by the program of program request in the program request ranking list but also be not buffered; Perhaps certain by the program of program request not in current program request ranking list, but at present in the setting cycle video-on-demand times of accumulation surpassed certain threshold value, then the CCP/UECP server all carries out buffer memory to this programme content.
In order to achieve the above object, the present invention also provides a kind of implementation method of mobile video order business of performance optimization, it is characterized in that: comprise the following steps:
(1) user is connected to the content release page of SCS by the WAP browser on the portable terminal, behind the retrieval program recommended information, the program request program, promptly click the hyperlink of this program, the media play software that the mobile subscriber installs by terminal sends real-time streaming protocol RTSP request to SCS, comprises the uniform resource position mark URL field that is used for user's request program on the addressing SCS server in this RTSP request message at least;
(2) the UECP server intercepts and resolves this RTSP request message at the RTSP request message of application layer monitoring portable terminal, extracts the URL of program, again with the program request ranking list on the URL coupling UECP; If the match is successful, carry out subsequent operation; Otherwise, redirect execution in step (4);
(3) the UECP server stops this RTSP request, after sending corresponding message to portable terminal and replying, extracts programme content from cache module, and uses Real-time Transport Protocol to send to portable terminal; If UECP buffer memory the partial programme content, then download the further part of this program file to CCP request by the IP direct connected link, guarantee the continuous broadcast of user side, process ends;
(4) the UECP server is forwarded to BSC with the RTSP request message of portable terminal, after the CCP server listens to this RTSP request message, intercepts and resolve this RTSP request message, extracts the URL of program, then with the program request ranking list on the URL coupling CCP; If the match is successful, the continuation that then stops this request message sends, and replys portable terminal with the RTSP message of correspondence by GGSN; Extract programme content then from its buffer memory storehouse, and send to portable terminal, transmit path is successively via CCP, UECP, BTS and MS; If coupling is unsuccessful, then this RTSP request message of CCP server forwards sends programme content by SCS to portable terminal then to SCS, and transmit path is successively via SCS, CCP, UECP, BTS and MS, the flow process end.
The present invention is a kind of mobile video order service system and implementation method based on GPRS mobile network, performance optimization, the main innovation of system is to increase by two class acting servers, and between sets up direct connection High Speed IP link, thereby sets up the buffer memory system of two-stage programme content.Wherein the CCP server of Yin Ruing has been alleviated the business load of streaming medium content server S CS, effectively reduces the network bandwidth consumption between GGSN and the SCS.The UECP server has the adaptive cache ability based on cache replacement policy, can guarantee the quick response of most of user video order request by the raising cache hit rate.The High Speed IP direct connected link can a large amount of mobile flow medium flow of bypass, obviously reduces the data traffic on the GGSN-SGSN-BSC link and handles load, reduces or has eliminated VOD service to this subnetwork Effect on Performance.
The head buffer memory that the UECP server adopts has following advantage: (1) has accelerated the program toggle speed, has promoted user's experience; (2) the transmission fluctuation of head buffer memory in can online smooth network; (3) effectively utilized the limited storage capacity of UECP.
In a word, after introducing above-mentioned two-level cache and acting on behalf of system, the mobile flow medium service on the GPRS network has been realized performance optimization largely, except original BTS to the Radio Link between the MS, the performance of other link all is improved or promotes, and helps the expansion of mobile demand (telecommunication) service.
Another advantage of two-level cache system of the present invention is: this technical scheme is transparent to user, network and content provider.From the working mechanism of UECP and CCP as can be seen, new two functional entitys introducing can not influence each network element device and the communication protocol in original GPRS network, need not the existing network system is carried out any modification, can be really transparent and seamlessly work in original GPRS mobile network.
Description of drawings
Fig. 1 is the mobile video order service (GPRS) network system configuration composition schematic diagram that the present invention has two-level cache, performance optimization.
Fig. 2 is the software control module structure composition schematic diagram that central cache of the present invention is acted on behalf of the CCP server.
Fig. 3 is that the software control module structure of user of the present invention border caching agent UECP is formed schematic diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, the present invention is a kind of mobile video order service system based on GPRS network, performance optimization, and the network element in this network comprises at least: moving exchanging center MSC/VLR, GPRS service support node SGSN (Serving GPRS Support Node), GPRS gateway are supported node GGSN (GatewayGPRS Support Node), streaming medium content server S CS, WAP portal site server, base station system BSS and customer mobile terminal MS; These system's improvements mainly are: on the border of GGSN in network and external packets data network PDN central cache is set and acts on behalf of the CCP server, in each BSS system (being between BTS and the BSC), user border caching agent UECP server is set again, also between CCP and UECP, set up the High Speed IP direct connected link, thereby constitute the two-level cache system that forms by the two-stage acting server.
The UECP that only drawn among the figure, during practical application, each BSS system all will dispose a UECP.Each public land mobile net PLMN disposes one or several CCP, and its quantity depends on the business demand amount.All to set up the High Speed IP direct connected link between all CCP and the UECP, be used for the transport stream media content.
Introduce the function of the newly-increased network element of above-mentioned two classes below and form module.Wherein central cache is acted on behalf of the function that the CCP server finishes and is mainly contained:
RTSP message monitoring and program request ranking list matching feature: monitor the RTSP message between GGSN and the SCS, intercepting is also resolved the RTSP request message, extracts the URL of program, then with the program request ranking list on the URL coupling CCP.If the match is successful, then stop this request message, and reply portable terminal by GGSN with the RTSP message of correspondence; Postpone then and extract programme content in the warehousing and use realtime transmission protocol RTP and send to portable terminal through the IP direct connected link; If coupling is unsuccessful, then transmit this RTSP request message to SCS.
The monitoring of realtime transmission protocol RTP Media Stream, transmission and buffer memory are replaced function: monitor and intercept the RTP Media Stream of SCS to GGSN, will satisfy the programme content of cache replacement policy and intercept and capture and be kept in its buffer memory storehouse; Be responsible for using Real-time Transport Protocol to send to the user from the programme content of SCS or from the programme content in the thesaurus.
Make CCP program request ranking list function: according to the cycle of setting (as one day, a week etc.), the play-on-demand program situation is added up or the play-on-demand program situation that each UECP reports is carried out tabulate statistics, and make the program request ranking list of CCP according to seniority among brothers and sisters criterion (as height) according to video-on-demand times.
Referring to Fig. 2, introduce the major control module and the function of CCP server:
RTSP packet filtering and forwarding module: monitor the RTSP message between GGSN and the SCS, intercepting is also resolved the RTSP request message, extracts the URL of program, replys the program request ranking list RTSP message that the match is successful then; Perhaps, transmit the program request ranking list and mate unsuccessful RTSP message.
The ranking list matching module: according to the URL of request program, the program request ranking list in the inquiry memory module is carried out the program coupling; If the match is successful, then indication " rtp streaming is monitored and transport module " is taken out programme content and is sent to the user from memory module; Otherwise, return the coupling unsuccessful outcome and give " RTSP packet filtering and forwarding module ".
Statistical analysis module: the CCP program request ranking list that completes, and deposit it in memory module;
Memory module: the whole/the beginning part content that is used to store the program request ranking list of CCP and goes into the list program;
The RTP Media Stream is monitored and transport module: monitor and intercept the RTP Media Stream of SCS to GGSN, and the program media stream content of notifying buffer memory replacement module will satisfy cache replacement policy is stored in memory module; Be responsible for using the programme content from SCS or memory module of intercepting Real-time Transport Protocol to send to the user through the IP direct connected link.
Buffer memory is replaced module: the programme content that will satisfy cache replacement policy is kept in the memory module, replaces the old programme content that has not satisfied cache replacement policy.
The function that user border caching agent UECP server is finished mainly contains:
RTSP message monitoring and program request ranking list matching feature: monitor the RTSP message between BTS and the BSC.Intercepting is also resolved the RTSP request message, extracts the URL of program, then with the program request ranking list on the URL coupling UECP.If the match is successful, then stop this request message, and reply portable terminal by BTS with the RTSP message of correspondence, extract programme content in the warehousing of postponing then and send to portable terminal; If coupling is unsuccessful, then UECP transmits this RTSP request message to BSC.
The monitoring of RTP Media Stream, transmission and buffer memory are replaced function: receive from the RTP Media Stream of CCP and be transferred to BTS, and the programme content that will satisfy cache replacement policy is kept in its buffer memory storehouse.It is emphasized that for the startup time-delay that reduces user's request program and (promptly send order request, to the time difference of seeing the first frame picture), consider the storage space limitations in UECP buffer memory storehouse simultaneously, the preferential head buffer memory of implementing on UECP: the beginning part (as: the preceding 5-10 minute content that program begins) that promptly is stored into the list program.
Make UECP program request ranking list function: according to certain cycle (as one day, a week etc.), the play-on-demand program situation is added up, and, make the program request ranking list of UECP, and statistical information is reported CCP according to certain seniority among brothers and sisters criterion (as height) according to video-on-demand times.Perhaps UECP receives the program request ranking list of CCP synchronously, as the program request ranking list of oneself.
Referring to Fig. 3, introduce the major control module and the function of UECP server:
RTSP packet filtering and forwarding module: monitor the RTSP message between BTS and the BSC, intercepting is also resolved the RTSP request message, extracts the URL of program, transmits the not RTSP message of coupling.
The ranking list matching module: according to the URL of request program, the program request ranking list in the inquiry memory module is carried out the program coupling.If the match is successful, then indication " RTP transport module " is taken out programme content and is sent to the user from memory module; If coupling is unsuccessful, then returns the coupling unsuccessful outcome and give " RTSP packet filtering and forwarding module ".
Statistical analysis module: finish the making function of UECP program request ranking list, and deposit it in memory module, regularly report statistical information to CCP.
Memory module: be used to store UECP program request ranking list and go into the whole of list program or the beginning part content;
RTP media flow transmission module: receive from the RTP Media Stream of CCP and be transferred to BTS, and the notice buffer memory is replaced the program stream content that module will satisfy cache replacement policy and is kept at its buffer memory storehouse;
Buffer memory is replaced module: the programme content that will satisfy cache replacement policy is kept in the memory module, replaces the old programme content that has not satisfied cache replacement policy.
The implementation method of the mobile video order business of performance optimization of the present invention is described to the process of streaming medium content server S CS (Streaming Content Server) initiation VoD request according to mobile terminal MS below, at this moment, the stream media terminal software of supporting the RTSP agreement has been downloaded and installed to this portable terminal.The operating procedure of performance optimization method is as follows:
Step 1: the user is connected to the content release page of SCS by the WAP browser on the portable terminal, retrieval program recommended information and program request program, click the hyperlink of this program then, the user sends real-time streaming protocol RTSP request by the media play software of installing on the terminal to SCS, comprises the uniform resource position mark URL field that is used for user's request program on the addressing SCS server in this RTSP request message;
Step 2:UECP server intercepts and resolves this RTSP request message at the RTSP request message of application layer monitoring portable terminal, extracts the URL of program, then with the program request ranking list on the URL coupling UECP; If the match is successful with program request ranking list on the UECP, carry out subsequent operation; Otherwise, redirect execution in step (4);
Step 3:UECP server stops this RTSP request, sends replying of corresponding RTSP to portable terminal, extracts programme content in the warehousing of postponing then, and uses Real-time Transport Protocol to send to portable terminal according to the Um Interface form.If the UECP partial content that has been buffer memory, then download the further part of this program file to the CCP request by the IP direct connected link, use TFTP TFTP/ file transfer protocol (FTP) FTP to download to UECP, guarantee the continuous broadcast of user side, finish playing flow;
Step 4:UECP server is forwarded to BSC with the RTSP request message of portable terminal, obtains media resource according to the normal program request flow process of tradition.After the CCP server listens to this RTSP request message, intercept and resolve this RTSP request message, extract the URL of program, then with the program request ranking list on the URL coupling CCP.If the match is successful, then stop this request message and continue to send to PDN, and reply portable terminal by GGSN with the RTSP message of correspondence.Postpone then and extract programme content in the warehousing and send to portable terminal, transmit path is CCP → UECP → BTS → MS; If coupling is unsuccessful, then this RTSP request message of CCP server forwards sends programme content by SCS to portable terminal then to SCS, and transmit path is SCS → CCP → UECP → BTS-→ MS, and flow process finishes.
Because UECP will realize message monitoring and the transparent transmission between the BTS and BSC in the GPRS network, so UECP will support to meet the Abis interface standard of GPRS network; Because CCP will realize message monitoring and intercepting between GGSN and the SCS, so CCP will support to meet the protocol stack of the Ui interface specification of GPRS network.In addition, because UECP also will realize mutual with CCP, and can be from the CCP program downloading, so can adopt the Ui interface specification that meets GPRS network to realize interconnecting between UECP and the CCP.
Claims (10)
1, a kind of mobile video order service system of performance optimization comprises at least: each network element in GPRS network and this network: moving exchanging center MSC, GPRS service support node SGSN, GPRS gateway are supported node GGSN, streaming medium content server S CS, WAP portal site server, base station system BSS and customer mobile terminal MS; It is characterized in that: described system also comprises:
Central cache is acted on behalf of the CCP server, is arranged on the GPRS gateway and supports to be used to alleviate the business load of SCS on the border of node GGSN and external packets data network PDN, reduces the network bandwidth consumption between GGSN and the SCS, improves the response speed of video request program;
User border caching agent UECP server, be arranged among each base station system BSS, promptly be arranged between each base station controller BSC and each base station BTS, has adaptive cache ability based on cache replacement policy, by improving cache hit rate, guarantee the quick response of user video order request;
The High Speed IP direct connected link, be arranged between CCP server and each the UECP server, be used between transport stream media content, and by this with the two-level cache device of described two class acting servers formation streaming medium content in whole system, thereby the programme content Streaming Media that bypass is a large amount of, obviously reduce the data traffic of other link and handle load, reduce, eliminate the influence of VOD service network performance.
2, mobile video order service system according to claim 1 is characterized in that: it is to be provided with one at least in each public land mobile net PLMN that described central cache is acted on behalf of the CCP server, and its configurable number amount depends on the business demand amount.
3, mobile video order service system according to claim 1 is characterized in that: described central cache is acted on behalf of the function that the CCP server finishes and is further included:
Monitor real-time streaming protocol RTSP message, again itself and program request ranking list are mated: monitor the RTSP message between GGSN and the SCS, intercepting is also resolved the RTSP request message, extracts the uniform resource position mark URL of program, again with the program request ranking list on the URL coupling CCP; If the match is successful, then stop this request message, and reply portable terminal by GGSN with the RTSP message of correspondence, extract programme content in the warehousing of postponing then and use realtime transmission protocol RTP to send to portable terminal through the IP direct connected link; Otherwise, transmit this RTSP request message to SCS;
The monitoring of realtime transmission protocol RTP Media Stream, transmission and buffer memory are replaced: monitor and intercept the RTP Media Stream of SCS to GGSN, the programme content that satisfies cache replacement policy is intercepted and captured and is kept in its buffer memory storehouse, use the programme content from SCS or buffer memory storehouse Real-time Transport Protocol to send to the user again;
Make CCP program request ranking list: according to the cycle of setting, the play-on-demand program situation is added up or the play-on-demand program situation that each UECP reports is carried out tabulate statistics, and the program request ranking list of making CCP according to the seniority among brothers and sisters criterion.
4, mobile video order service system according to claim 3 is characterized in that: the software control module that described central cache is acted on behalf of in the CCP server includes:
RTSP packet filtering and forwarding module: monitor the RTSP message between GGSN and the SCS, intercepting is also resolved the RTSP request message, extract the uniform resource position mark URL of program, reply the program request ranking list RTSP message that the match is successful then, transmit the program request ranking list and mate unsuccessful RTSP message;
The ranking list matching module: according to the URL of request program, the program request ranking list in the inquiry memory module is carried out the program coupling; If the match is successful, then indication " the RTP Media Stream is monitored and transport module " is taken out programme content and is sent to the user from memory module; Otherwise, then return the coupling unsuccessful outcome to " RTSP packet filtering and forwarding module ";
Statistical analysis module: the CCP program request ranking list that completes, and deposit it in memory module;
Memory module: be used to store CCP program request ranking list and go into the whole of list program or the beginning part content;
The RTP Media Stream is monitored and transport module: monitor and intercept the RTP Media Stream of SCS to GGSN, and the media stream content of notifying buffer memory replacement module will satisfy cache replacement policy is stored in memory module; Be responsible for using what intercept Real-time Transport Protocol to send to the user from the programme content of SCS or the programme content of memory module through the IP direct connected link.
Buffer memory is replaced module: the programme content that will satisfy cache replacement policy is kept in the memory module, replaces the old programme content that has not satisfied cache replacement policy.
5, mobile video order service system according to claim 1 is characterized in that: the function that described user border caching agent UECP server is finished further includes:
Monitor real-time streaming protocol RTSP message, again itself and program request ranking list are mated: monitor the RTSP message between BTS and the BSC, intercepting is also resolved the RTSP request message, extracts the uniform resource position mark URL of program, again with the program request ranking list on the URL coupling UECP; If the match is successful, then stop this request message, and reply portable terminal by BTS with the RTSP message of correspondence, extract programme content in the warehousing of postponing then and send to portable terminal; If coupling is unsuccessful, then transmit this RTSP request message to BSC;
The monitoring of realtime transmission protocol RTP Media Stream, transmission and buffer memory are replaced: receive from the RTP Media Stream of CCP and be transferred to BTS, and the programme content that will satisfy cache replacement policy is kept in its buffer memory storehouse; In the caching process process, preferentially adopt the head buffer memory, to make full use of the limited storage capacity of UECP;
Make UECP program request ranking list: according to the cycle of setting, the play-on-demand program situation is added up, make the program request ranking list of UECP according to ranking criterion, and statistical information is reported CCP; Perhaps UECP receives the program request ranking list of CCP synchronously, as the program request ranking list of oneself.
6, mobile video order service system according to claim 5, it is characterized in that: described head buffer memory is the beginning partial content that is stored into the list program, with the startup time-delay that reduces user's request program-from sending order request, to make full use of the memory space in UECP buffer memory storehouse to the time difference of seeing the first frame picture;
7, mobile video order service system according to claim 5 is characterized in that: the software control module in the caching agent UECP server of described user border includes:
RTSP packet filtering and forwarding module: monitor the RTSP message between BTS and the BSC, intercepting is also resolved the RTSP request message, extracts the uniform resource position mark URL of program, transmits the RTSP message that the match is successful;
The ranking list matching module: according to the URL of request program, the program request ranking list in the inquiry memory module is carried out the program coupling; If the match is successful, then indication " RTP media flow transmission module " is taken out programme content and is sent to the user from memory module; Otherwise, then return the coupling unsuccessful outcome to " RTSP packet filtering and forwarding module ";
Statistical analysis module: the UECP program request ranking list that completes, and deposit it in memory module, regularly report statistical information to CCP;
Memory module: be used to store UECP program request ranking list and go into the whole of list program or the beginning part content;
RTP media flow transmission module: receive from the RTP Media Stream of CCP and be transferred to BTS, and the notice buffer memory is replaced the program stream content that module will satisfy cache replacement policy and is kept in the memory module; Accept the indication of ranking list matching module, the programme content that the match is successful is taken out and send to the user from memory module;
Buffer memory is replaced module: the programme content that will satisfy cache replacement policy is kept in the memory module, replaces the old programme content that has not satisfied cache replacement policy.
8, according to claim 4 or 7 described mobile video order service systems, it is characterized in that: the core data table that described play-on-demand program ranking list is the CCP/UECP server maintenance, it is made up of a series of records, every record corresponding a program in the list, article one, record is made up of several entries, these entries include but not limited to URL, access address, the program price of program in memory module of program code, programm name, program brief introduction, program, and the size of ranking list depends on the buffer memory capacity of CCP/UECP server.
9, according to claim 4 or 7 described mobile video order service systems, it is characterized in that: the content of described cache replacement policy is: if certain by the program of program request in the program request ranking list but also be not buffered; Perhaps certain by the program of program request not in current program request ranking list, but at present in the setting cycle video-on-demand times of accumulation surpassed certain threshold value, then the CCP/UECP server all carries out buffer memory to this programme content.
10, a kind of implementation method of mobile video order business of performance optimization is characterized in that: comprise the following steps:
(1) user is connected to the content release page of SCS by the WAP browser on the portable terminal, behind the retrieval program recommended information, the program request program, promptly click the hyperlink of this program, the media play software that the mobile subscriber installs by terminal sends real-time streaming protocol RTSP request to SCS, comprises the uniform resource position mark URL field that is used for user's request program on the addressing SCS server in this RTSP request message at least;
(2) the UECP server intercepts and resolves this RTSP request message at the RTSP request message of application layer monitoring portable terminal, extracts the URL of program, again with the program request ranking list on the URL coupling UECP; If the match is successful, carry out subsequent operation; Otherwise, redirect execution in step (4);
(3) the UECP server stops this RTSP request, after sending corresponding message to portable terminal and replying, extracts programme content from cache module, and uses Real-time Transport Protocol to send to portable terminal; If UECP buffer memory the partial programme content, then download the further part of this program file to CCP request by the IP direct connected link, guarantee the continuous broadcast of user side, process ends;
(4) the UECP server is forwarded to BSC with the RTSP request message of portable terminal, after the CCP server listens to this RTSP request message, intercepts and resolve this RTSP request message, extracts the URL of program, then with the program request ranking list on the URL coupling CCP; If the match is successful, the continuation that then stops this request message sends, and replys portable terminal with the RTSP message of correspondence by GGSN; Extract programme content then from its buffer memory storehouse, and send to portable terminal, transmit path is successively via CCP, UECP, BTS and MS; If coupling is unsuccessful, then this RTSP request message of CCP server forwards sends programme content by SCS to portable terminal then to SCS, and transmit path is successively via SCS, CCP, UECP, BTS and MS, the flow process end.
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