CN101510994A - Method for requesting unidirectional wired TV set-top box video back-transmitted by using mobile communication network - Google Patents

Abstract

Translated fromChinese

本发明提供一种利用移动通信网络回传的单向有线电视机顶盒视频点播方法，该方法是用户利用移动通信网络访问EPG服务器，查看节目清单，并提交点播请求，视频点播服务器把节目流向该用户所属的IP－QAM设备发送，IP－QAM把节目流调制到射频信号上，由该用户的机顶盒接收回放。这种视频点播的方法不需要有线电视进行双向改造，也不需要增加额外的计算机网络，能够快速实现视频点播服务。

The invention provides a one-way cable TV set-top box video-on-demand method using mobile communication network backhaul. The method is that the user accesses the EPG server through the mobile communication network, checks the program list, and submits an on-demand request, and the video-on-demand server streams the program to the user. The IP-QAM equipment to which it belongs sends, and the IP-QAM modulates the program stream onto the radio frequency signal, which is received and played back by the user's set-top box. This video-on-demand method does not require two-way transformation of the cable TV, nor does it need to add an additional computer network, and can quickly realize the video-on-demand service.

Description

Translated fromChinese

一种利用移动通信网络回传的单向有线电视机顶盒视频点播方法A method of video-on-demand in a one-way cable TV set-top box using mobile communication network backhaul

技术领域technical field

本发明涉及一种网络通讯技术，具体地说是一种利用移动通信网络回传的单向有线电视机顶盒视频点播方法。The invention relates to a network communication technology, in particular to a one-way video-on-demand method for a cable TV set-top box backhauled by a mobile communication network.

背景技术Background technique

电视技术和应用的进一步发展方向是互动和高清，其中视频点播(Video ondemand，以下简称VOD)是互动电视的主要内容。相对于目前基于计算机终端的VOD，电视VOD能够提供更大的画面，观众可以采用更舒适的欣赏姿势，获得更好的欣赏体验，是VOD的主要形式。The further development direction of TV technology and application is interactive and high-definition, among which video on demand (Video on demand, hereinafter referred to as VOD) is the main content of interactive TV. Compared with the current VOD based on computer terminals, TV VOD can provide a larger picture, and the audience can adopt a more comfortable viewing posture to obtain a better viewing experience. It is the main form of VOD.

针对VOD的需求，目前已经实现了多种面向电视的VOD播技术，主要包括NVOD、IPTV和IP-QAM等，并在实际中获得了应用。Aiming at the demand of VOD, a variety of TV-oriented VOD broadcast technologies have been implemented, mainly including NVOD, IPTV and IP-QAM, etc., and have been applied in practice.

NVOD是随着有线电视数字化实现的，通过把节目以多个流同时错时播出，使用户在收看时可以就近收看。NVOD采用广播实现，没有并发用户限制，但是由于播出节目并不受用户控制，仍然是被动收看模式。这只是一种准VOD技术，无法满足用户自主选择节目的需求，在实际应用中效果很差。NVOD is realized along with the digitalization of cable TV. By broadcasting programs with multiple streams at different times at the same time, users can watch them nearby when watching. NVOD is implemented by broadcasting, and there is no limitation on concurrent users. However, since broadcasting programs are not controlled by users, it is still a passive viewing mode. This is just a quasi-VOD technology, which cannot meet the needs of users to choose programs independently, and the effect is very poor in practical applications.

由于计算机网络具有双向通信能力，随着技术的进步，带宽也在迅速提高，已经承载起了基于计算机的VOD。利用计算机网络，开发了具有网络接口的机顶盒，从服务器点播节目并解码回放到电视机上，形成了IPTV。IPTV是用户能够自由地选择节目，并各自独立地进行播放控制，是一种真正的VOD技术。IPTV目前已经在上海等城市开始使用。IPTV的承载网络是IP网，目前缺乏有效的QoS机制，节目流传输容易受到网络波动的影响，造成播放质量降低。为了避免其它网络应用影响IPTV，很多项目重新建立了IPTV专网，造成建设和运营成本居高不下。在大量用户并发点播情况下，会在网络上产生巨大的节目流量，造成网络阻塞。为了降低网络带宽压力，IPTV一般对音视频采用较大比率的压缩，使得欣赏效果相对降低。对于高清节目，带宽限制使其在IPTV上实现更困难。Due to the two-way communication capability of the computer network, with the advancement of technology, the bandwidth is also increasing rapidly, and the computer-based VOD has been carried. Using the computer network, a set-top box with a network interface has been developed, and programs are ordered from the server and decoded and played back on the TV, forming IPTV. IPTV is a real VOD technology that allows users to freely select programs and independently perform playback control. IPTV has already started to be used in Shanghai and other cities. The bearer network of IPTV is an IP network. At present, there is no effective QoS mechanism. Program stream transmission is easily affected by network fluctuations, resulting in lower playback quality. In order to prevent other network applications from affecting IPTV, many projects have re-established IPTV private networks, resulting in high construction and operation costs. In the case of a large number of users concurrently ordering programs, a huge program traffic will be generated on the network, causing network congestion. In order to reduce the pressure on network bandwidth, IPTV generally adopts a large ratio of audio and video compression, making the appreciation effect relatively reduced. For HD programming, bandwidth limitations make it more difficult to implement on IPTV.

由于有线电视网络采用广播模式传输，不会发生冲突，因此传输性能稳定，而且带宽巨大，是VOD传输的良好通道。因此在HFC网络上开发实现了基于IP-QAM的VOD技术，如图1。在各分前端部署IP-QAM设备，通过IP协议连接位于中心的VOD服务器。用户端配备具有网络接口的有线电视机顶盒，通过IP网络访问位于中心的EPG服务器，查询节目列表和详情，并提交点播请求。EPG服务器将命令VOD服务器向该机顶盒所属区域的IP-QAM发送节目流，IP-QAM设备接收后调制到射频信号上，在本区域的同轴电缆网内进行广播，这样机顶盒就可以接收到点播的节目流。由于IP-QAM模式VOD的传输在IP-QAM以前是由HFC的光纤网承载的，如图2所示，一般采用DMDW等高带宽技术，容量高，传输质量有保证。而在IP-QAM之后，采用在同轴电缆内单向广播传输，因此具有良好的传输特性，避免了传输不稳定、堵塞或者发生冲突等问题。因此基于IP-QAM的VOD技术在目前效果最好，并且可以承载高清节目的VOD。Since the cable TV network adopts the broadcast mode for transmission, there will be no conflict, so the transmission performance is stable, and the bandwidth is huge, which is a good channel for VOD transmission. Therefore, the VOD technology based on IP-QAM has been developed and implemented on the HFC network, as shown in Figure 1. Deploy IP-QAM equipment at the front end of each branch, and connect to the VOD server located in the center through IP protocol. The client is equipped with a cable TV set-top box with a network interface, accesses the EPG server located in the center through the IP network, queries the program list and details, and submits an on-demand request. The EPG server will order the VOD server to send the program stream to the IP-QAM in the area to which the set-top box belongs, and the IP-QAM device will modulate it on the radio frequency signal after receiving it, and broadcast it in the coaxial cable network in the area, so that the set-top box can receive the on-demand program stream. Before IP-QAM, VOD transmission in IP-QAM mode was carried by HFC optical fiber network, as shown in Figure 2, generally using high-bandwidth technologies such as DMDW, with high capacity and guaranteed transmission quality. After IP-QAM, unidirectional broadcast transmission is adopted in the coaxial cable, so it has good transmission characteristics and avoids problems such as unstable transmission, congestion or conflicts. Therefore, the VOD technology based on IP-QAM has the best effect at present, and can carry the VOD of high-definition programs.

这种基于IP-QAM的VOD系统由头端服务器、用户终端的双向机顶盒和通信链路组成，(如图1)其中头端服务器主要包括基于Web服务的电子节目导航服务器(EPG服务器)和视频点播服务器(以下称为VOD服务器)组成；通信链路包括用于用户信息回传的IP通道和节目流下行的HFC网络，包含HFC分前端的IP-QAM设备。双向机顶盒通过IP回传通道访问EPG服务器，获得节目清单，并提交点播请求，EPG服务器控制VOD服务器向该用户所在区域的IP-QAM发送节目流，机顶盒通过同轴电缆接收经IP-QAM调制的射频信号。This IP-QAM-based VOD system consists of a head-end server, a two-way set-top box of a user terminal and a communication link, (as shown in Figure 1) where the head-end server mainly includes an electronic program guide server (EPG server) based on Web services and video-on-demand The server (hereinafter referred to as the VOD server) is composed; the communication link includes the IP channel for user information return and the HFC network for the downstream of the program stream, including the IP-QAM equipment of the HFC sub-front end. The two-way set-top box accesses the EPG server through the IP return channel, obtains the program list, and submits an on-demand request. The EPG server controls the VOD server to send the program stream to the IP-QAM in the user's area, and the set-top box receives the IP-QAM modulated program stream through the coaxial cable. RF signal.

但是IP-QAM VOD不仅需要用户接入有线电视网络，为了实现用户点播信息回传，必须有回传通道。回传通道有多种实现方式：采用宽带网回传，会额外增加实施复杂度和使用费用；进行有线电视双向改造，机顶盒需要继承Cable Modem，建设成本高。这都限制了IP-QAM VOD的普及发展。However, IP-QAM VOD not only requires users to access the cable TV network, but also needs to have a return channel in order to realize the return of user-on-demand information. There are many ways to implement the backhaul channel: using broadband network backhaul will increase the implementation complexity and usage costs; for two-way transformation of cable TV, the set-top box needs to inherit the Cable Modem, and the construction cost is high. This limits the popularization and development of IP-QAM VOD.

发明内容Contents of the invention

本发明的目的是提供一种利用移动通信网络回传的单向有线电视机顶盒视频点播方法。The purpose of the present invention is to provide a one-way cable television set-top box video-on-demand method utilizing mobile communication network backhaul.

本发明的目的是按以下方式实现的，把移动电话作为用户进行视频点播控制的辅助终端，利用移动通信网络的双向通信能力，作为用户查询和发送点播命令的的回传通道，服务器产生节目流通过传统的HFC网络下行到用户机顶盒，使得只有有线数字电视接收功能的机顶盒能够实现全功能的视频点播，VOD系统：其中头端服务器，包括VOD服务器、EPG服务器和声明服务器；用户终端，包括单向机顶盒和移动电话；信息回传通道，即移动通信网络；节目流下行通道，即HFC网络，包括位于分前端的QAM和IP-QAM设备，其中EPG服务器通过连接移动通信网络，向移动电话提供WAP服务、节目查询服务和接收用户点播请求服务；具体点播方法包括1)查询和发送节目流的方法；2)实现用户点播的节目流路由方法；3)实现的视频点播中单向机顶盒选择接收节目流的方法，4)防止用户错过节目开头保证用户完整收看；5)支持机顶盒在不同IP-QAM间移动，使点播节目流能够正确路由到迁移后的机顶盒；其中The purpose of the present invention is achieved in the following manner, the mobile phone is used as an auxiliary terminal for the user to perform video-on-demand control, and the two-way communication capability of the mobile communication network is utilized as a return channel for the user to inquire and send an on-demand command, and the server generates the program stream Through the traditional HFC network downlink to the user's set-top box, the set-top box with only cable digital TV receiving function can realize full-featured video on demand, VOD system: the head-end server includes VOD server, EPG server and statement server; user terminal, including single To the set-top box and mobile phone; the information return channel, that is, the mobile communication network; the program stream downlink channel, that is, the HFC network, including QAM and IP-QAM equipment located at the front end, where the EPG server connects to the mobile communication network and provides the mobile phone with WAP service, program query service and service of receiving user's order request; specific ordering method includes 1) method for inquiring and sending program stream; 2) method for routing program stream to realize user's order; 3) one-way set-top box selection reception in realized video on demand The method of program flow, 4) prevent the user from missing the beginning of the program and ensure that the user can watch it completely; 5) support the set-top box to move between different IP-QAMs, so that the on-demand program stream can be correctly routed to the migrated set-top box; wherein

1)查询和发送节目流的方法；包括以下步骤：1) A method for querying and sending a program stream; including the following steps:

a、用户利用移动电话的WAP浏览器通过移动通信网络访问视频点播服务器端基于WAP服务器的导航服务器，查询节目清单和节目信息；a, the user utilizes the WAP browser of the mobile phone to access the navigation server based on the WAP server at the video-on-demand server end through the mobile communication network, and inquire about the program list and program information;

b、EPG服务器通过移动通信网络向用户移动电话返回用户需要的信息；b. The EPG server returns the information required by the user to the user's mobile phone through the mobile communication network;

c、用户通过移动电话的WAP页面向EPG服务器提交点播请求；c. The user submits an on-demand request to the EPG server through the WAP page of the mobile phone;

d、EPG服务器控制视频点播服务器向用户机顶盒所属区域的IP-QAM发送用户点播的节目流IP-QAM进行射频调制，在本地的有线电视同轴电缆网上广播；d. The EPG server controls the video-on-demand server to send the program stream IP-QAM requested by the user to the IP-QAM in the area to which the user's set-top box belongs for radio frequency modulation, and broadcast it on the local cable TV coaxial cable network;

e、用户机顶盒接收来自有线电视同轴电缆的射频广播，并回放所点播的节目。e. The user's set-top box receives the radio frequency broadcast from the coaxial cable of the cable TV, and plays back the program requested.

2)用户身份认证和节目流路由方法，是把用户移动电话号码和用户数字电视用户号绑定，EPG服务器从用户移动电话发送的WAP请求中获得移动电话号码，进行有线电视用户身份的认定，并确定该用户所在区域的IP-QAM，保证VOD服务器把节目流路由到正确的IP-QAM，使节目流经IP-QAM广播能够覆盖用户机顶盒，还包括以下步骤：2) User identity authentication and program stream routing method are to bind the user's mobile phone number with the user's digital TV user number, and the EPG server obtains the mobile phone number from the WAP request sent by the user's mobile phone to identify the identity of the cable TV user. And determine the IP-QAM in the area where the user is located, ensure that the VOD server routes the program stream to the correct IP-QAM, so that the program stream can cover the user's set-top box through the IP-QAM broadcast, and also includes the following steps:

a、当用户开通服务时，记录其数字电视用户号和注册的移动电话号码，以及其所属区域的IP-QAM，其中数字电视用户号是用户的标识号，是用户的条件接收卡号，移动电话号码要和数字电视用户号一一对应；a. When the user activates the service, record their digital TV user number and registered mobile phone number, as well as the IP-QAM of the area to which they belong, where the digital TV user number is the user's identification number, which is the user's conditional access card number, and the mobile phone The number should correspond one-to-one with the digital TV user number;

b、用户通过移动电话访问EPG服务器时，EPG服务器在其WAP请求中提取出用户的移动电话号码，通过步骤a中记录的信息确定用户身份，即有线数字电视用户号，以及所属区域的IP-QAM；b. When a user accesses the EPG server through a mobile phone, the EPG server extracts the user's mobile phone number from its WAP request, and determines the user's identity through the information recorded in step a, that is, the cable digital TV user number, and the IP- QAM;

c、EPG服务器接收到点播请求后，选择用户所在区域的IP-QAM设备的一个具有足够空闲带宽的播出频点，以及在这个频点上未使用的节目号，并按照该IP-QAM设备的播出频点编号和节目号与节目流接收UDP端口的映射规则计算出节目流接收UDP端口；c. After the EPG server receives the on-demand request, it selects a broadcast frequency point with enough free bandwidth of the IP-QAM equipment in the user's area, and an unused program number on this frequency point, and according to the IP-QAM equipment Calculate the program stream receiving UDP port according to the mapping rules of the broadcast frequency point number and program number and the program stream receiving UDP port;

d、EPG服务器把用户点播节目信息、该用户机顶盒所在区域的IP-QAM设备的IP地址和其接收节目流UDP端口号发送给VOD服务器；d. The EPG server sends the user's program information on demand, the IP address of the IP-QAM device in the area where the user's set-top box is located, and its UDP port number for receiving the program stream to the VOD server;

e、VOD服务器读取被点播节目文件，形成节目流，发送到目的IP-QAM的指定UDP端口；e. The VOD server reads the requested program file, forms a program stream, and sends it to the designated UDP port of the destination IP-QAM;

f、IP-QAM根据接收节目流的UDP端口号重新映射出播出频点编号和节目号，以及该节目的PMT PID和音视频流的PID参数，按照这些参数修改节目流中对应的参数，并调制到该播出频道上，在该区域的有线电视同轴电缆网上广播；f. IP-QAM remaps the broadcast frequency point number and program number according to the UDP port number of the received program stream, as well as the PMT PID of the program and the PID parameters of the audio and video stream, and modify the corresponding parameters in the program stream according to these parameters, and Modulated to the broadcast channel, and broadcast on the cable TV coaxial cable network in the area;

g、用户机顶盒能够通过同轴电缆接收到其点播的节目流，进行解码回放。g. The set-top box of the user can receive the program stream on demand through the coaxial cable, and perform decoding and playback.

3)实现的视频点播中单向机顶盒选择接收节目流的方法，是设置声明服务器，掌握当前点播的所有用户的有线数字电视用户号和其点播节目流在IP-QAM上的播出频道及节目号信息，并且在一个成为VOD主频点的保留频道上向整个有线电视网广播，使进行点播的机顶盒能够接收到，并获得所点播节目流的播出频道频点以及节目号必需信息，依据这些信息机顶盒就接收到其点播的节目流，其步骤如下：3) The method for the one-way set-top box to select and receive the program stream in the realized video on demand is to set up the statement server to grasp the cable digital TV user numbers of all users currently ordering and the broadcast channels and programs of the program streams on IP-QAM Number information, and broadcast to the entire cable television network on a reserved channel that becomes the main frequency point of VOD, so that the set-top box that performs on-demand can receive it, and obtain the broadcast channel frequency and program number necessary information of the program stream on demand, according to These information set-top boxes just receive the program flow of its order, and its steps are as follows:

a、接收到用户电波请求后，EPG服务器把点播该节目的有线数字电视用户号和所选择节目的频道频点和节目号发送给声明服务器，声明服务器打包为TS流，推向所有HFC分前端的QAM设备，在一个称之为VOD主频点的保留频道上在整个有线电视网中持续播出；a. After receiving the user's radio wave request, the EPG server sends the cable digital TV user number who ordered the program and the channel frequency and program number of the selected program to the declaration server, and the declaration server packs it into a TS stream and pushes it to all HFC sub-headends QAM equipment, broadcast continuously throughout the cable network on a reserved channel called VOD main frequency point;

b、用户把机顶盒切换到VOD模式，即处于接收VOD主频点状态，持续在声明服务器播出内容中搜索该用户的有线数字电视用户号；b. The user switches the set-top box to the VOD mode, that is, it is in the state of receiving the VOD main frequency point, and continuously searches for the user's cable digital TV user number in the broadcast content of the statement server;

c、当机顶盒接收到其有线数字电视用户号，获得该用户本次点播节目播出频道频点和节目号；c. When the set-top box receives its cable digital TV user number, it obtains the broadcast channel frequency and program number of the user's current on-demand program;

d、机顶盒把接收频点切换到步骤c获得的播出频道频点，并根据节目号提取该节目的PMT和音视频信息，进行解码回放，实现点播。d. The set-top box switches the receiving frequency point to the broadcast channel frequency point obtained in step c, and extracts the PMT and audio and video information of the program according to the program number, decodes and plays back, and realizes on-demand.

4)防止用户错过节目开头保证用户完整收看方法：VOD服务器在播出所点播节目的节目流之前，进行测试流的播出，只有用户进行点播开始播放的确认后，VOD服务器才发送所点播节目的节目流用以防止用户错过节目开头保证用户完整收看，处理方法如下：4) Prevent the user from missing the beginning of the program and ensure the user's complete viewing method: the VOD server broadcasts the test stream before broadcasting the program stream of the requested program, and only after the user confirms that the program starts to play, the VOD server sends the requested program The program stream is used to prevent the user from missing the beginning of the program and ensure that the user can watch it completely. The processing method is as follows:

a、用户提交点播请求后，移动电话进入确认播放页面，提示用户在电视显示提示用户播放的内容后再提交确认播放请求；a. After the user submits the on-demand request, the mobile phone enters the confirmation play page, prompting the user to submit the confirmation play request after the TV displays the content that prompts the user to play;

b、VOD服务器接收到点播请求后，首先向IP-QAM发送测试节目流，内容是提示用户通过移动电话发送确认播放请求；b. After the VOD server receives the on-demand request, it first sends a test program flow to IP-QAM, and the content is to prompt the user to send a confirmation play request through the mobile phone;

c、当机顶盒进入VOD模式后并接收到测试节目流后，在电视屏幕显示对用户的提示信息；c. When the set-top box enters the VOD mode and receives the test program stream, it displays a prompt message to the user on the TV screen;

d、用户按照提示，在移动电话的WAP页面中提交确认播放请求；d. The user follows the prompts and submits a request to confirm the playback on the WAP page of the mobile phone;

e、EPG服务器接收到确认播放请求，控制VOD服务器开始发送所点播的节目内容；e. The EPG server receives the confirmation play request and controls the VOD server to start sending the requested program content;

f、用户机顶盒接收到点播节目。f. The user set-top box receives the on-demand program.

5)支持机顶盒在不同IP-QAM间移动，使点播节目流能够正确路由到迁移后的机顶盒，处理步骤如下：5) Support set-top boxes to move between different IP-QAMs, so that on-demand program streams can be correctly routed to the migrated set-top boxes. The processing steps are as follows:

a、各IP-QAM在其播出频点持续向本区域的有线电视同轴电缆网广播其标识号，同时声明服务器在其VOD主频点中持续地向全网播出所有IP-QAM的播出频点列表；a. Each IP-QAM continuously broadcasts its identification number to the cable TV coaxial cable network in this area at its broadcast frequency point, and at the same time declares that the server continuously broadcasts all IP-QAM videos to the entire network at its VOD main frequency point Broadcast frequency list;

b、机顶盒在进入VOD模式时，首先切换到在非易失存储器中保存的IP-QAM的播出频点，接收IP-QAM广播的IP-QAM标识号；B, when the set-top box enters the VOD mode, it first switches to the IP-QAM broadcast frequency point stored in the non-volatile memory, and receives the IP-QAM identification number of the IP-QAM broadcast;

c、如果接收到的IP-QAM标识号与其在非易失存储器中保存的IP-QAM标识号相同，则表明机顶盒位置未发生变化，执行步骤j；c. If the received IP-QAM identification number is the same as the IP-QAM identification number stored in the non-volatile memory, it indicates that the position of the set-top box has not changed, and step j is performed;

d、如果接收到的IP-QAM标识号与其在非易失存储器中保存的IP-QAM标识号不同，则表明机顶盒位置发生变化，然后从步骤h向下执行；d. If the received IP-QAM identification number is different from the IP-QAM identification number stored in the non-volatile memory, it indicates that the position of the set-top box changes, and then execute from step h downward;

e、如果在一定时间内接收不到IP-QAM标识号广播，表明机顶盒迁移到一个IP-QAM播出频点不同的区域；e. If the IP-QAM identification number broadcast cannot be received within a certain period of time, it indicates that the set-top box has migrated to an area with a different IP-QAM broadcast frequency;

f、机顶盒切换到VOD主频点接收全部IP-QAM播出频点列表的广播；f. The set-top box switches to the VOD main frequency point to receive the broadcast of all IP-QAM broadcast frequency point lists;

g、机顶盒逐一切换到各IP-QAM的播出频点，直到能够接收到IP-QAM的标识号广播声明；g. The set-top box switches to each IP-QAM broadcast frequency point one by one, until it can receive the broadcast statement of the IP-QAM identification number;

h、机顶盒把接收到的IP-QAM标识号在电视屏幕上显示，指示用户通过移动电话进入IP-QAM设置的WAP页面，输入该IP-QAM标识号，提交给EPG服务器；同时机顶盒把IP-QAM标识号和其播出频点保存在非易失存储器中；h, the set-top box displays the received IP-QAM identification number on the TV screen, instructs the user to enter the WAP page set by the IP-QAM through the mobile phone, enter the IP-QAM identification number, and submit it to the EPG server; at the same time, the set-top box sends the IP-QAM The QAM identification number and its broadcast frequency are stored in non-volatile memory;

i、EPG服务器接收到IP-QAM标识号更新信息，修改相应记录，以后发生的点播节目流将会发送给当前机顶盒所在区域的IP-QAM，保证机顶盒能够接收到节目流。i. The EPG server receives the update information of the IP-QAM identification number and modifies the corresponding records. The on-demand program streams that will occur in the future will be sent to the IP-QAM in the area where the current set-top box is located to ensure that the set-top box can receive the program streams.

本发明的有益效果是：是发展了IP-QAM VOD在于其回传通道的建设。由于移动通信具有全面覆盖的优势，并具备数据通信能力，本发明提出了把移动通信网络作为IP-QAM VOD的回传通道的方法，利用其双向通信能力，实现用户查询节目列表和详情，以及进行点播控制等与头端服务器的通信，而点播的节目流继续通过HFC网络经IP-QAM广播到用户机顶盒。由于不需要机顶盒直接进行信息回传，这种VOD技术不再需要具备网络接口的双向机顶盒，原来只具有接收功能的有线数字单向电视机顶盒在软件上稍做改动即可获得支持。The beneficial effects of the present invention are: the development of IP-QAM VOD lies in the construction of its return channel. Because mobile communication has the advantage of comprehensive coverage and has data communication capability, the present invention proposes a method for using the mobile communication network as the return channel of IP-QAM VOD, utilizing its two-way communication capability to enable users to query program lists and details, and Perform on-demand control and other communications with the head-end server, and the on-demand program stream continues to be broadcast to the user's set-top box through the HFC network via IP-QAM. Since there is no need for a set-top box to directly transmit information, this VOD technology no longer needs a two-way set-top box with a network interface. The original cable digital one-way TV set-top box that only has a receiving function can be supported with a slight change in software.

附图说明：Description of drawings:

附图1是传统的基于IP-QAM的VOD系统结构图；Accompanying drawing 1 is a traditional VOD system structure diagram based on IP-QAM;

附图2是IP-QAM在HFC网络的位置示意图；Accompanying drawing 2 is the schematic diagram of the position of IP-QAM in HFC network;

附图3是利用移动通信网作为回传通道的IP-QAM VOD系统结构图。Accompanying drawing 3 is to utilize mobile communication network as the IP-QAM VOD system structural diagram of backhaul channel.

具体实施方式Detailed ways

参照说明书附图对本发明的方法作以下详细地说明。The method of the present invention is described in detail below with reference to the accompanying drawings.

一、本发明实现的VOD系统的构成和工作原理One, the composition and working principle of the VOD system realized by the present invention

本发明是在传统的IP-QAM VOD基础上进行改造，通过用移动通信网络作为用户信息回传通道。这种VOD系统包括4部分，如图3：头端服务器，包括VOD服务器、EPG服务器和声明服务器；用户终端，包括单向机顶盒和移动电话；信息回传通道，即移动通信网络；节目流下行通道，即HFC网络，包括位于分前端的QAM和IP-QAM设备。其中EPG服务器通过连接移动通信网络，向移动电话提供WAP服务，向用户提供节目查询服务，并接收用户点播请求。The present invention transforms the traditional IP-QAM VOD by using the mobile communication network as the user information return channel. This VOD system includes 4 parts, as shown in Figure 3: head-end server, including VOD server, EPG server and statement server; user terminal, including one-way set-top box and mobile phone; information return channel, that is, mobile communication network; program stream downlink The channel, that is, the HFC network, includes QAM and IP-QAM equipment located at the sub-head end. Among them, the EPG server provides WAP service to the mobile phone by connecting to the mobile communication network, provides program query service to the user, and receives the request of the user.

基本的工作流程如下：用户用移动电话通过移动通信网络浏览EPG服务器的WAP页面，可以查询节目，并提交点播请求；EPG服务器控制VOD服务器向用户机顶盒所属区域的IP-QAM发送节目流；用户机顶盒接收经IP-QAM调制为射频信号的节目流，进行回放。The basic workflow is as follows: the user uses a mobile phone to browse the WAP page of the EPG server through the mobile communication network, can query the program, and submit an on-demand request; the EPG server controls the VOD server to send the program stream to the IP-QAM in the area where the user's set-top box belongs; the user's set-top box Receive the program stream modulated by IP-QAM into radio frequency signal and play it back.

用户对节目的查询和播放控制等通信通过移动通信网络的WAP技术实现，具有不需要在移动电话安装客户端软件的优点，并且具有通信流量小、无恒定带宽要求和实时性较低的特点，带宽有限的移动通信网络完全能够承载，在目前的资费条件下产生的通信费用也非常低。而VOD服务器提供给用户的点播节目流具有流量大、带宽要求恒定和实时传输的特点，特别是数据只是从VOD服务器到机顶盒单向传输，非常适合通过HFC网络传输。本发明把移动通信网与HFC网集成实现VOD功能，发挥各自的传输特点和优势，在不需要有线电视双向改造或新建IP网络的情况下，能够快速大规模实现VOD服务。Communications such as users' inquiries about programs and play control are realized through the WAP technology of the mobile communication network, which has the advantages of not needing to install client software on mobile phones, and has the characteristics of small communication traffic, no constant bandwidth requirements, and low real-time performance. The mobile communication network with limited bandwidth can fully carry the load, and the communication cost generated under the current tariff conditions is also very low. The on-demand program stream provided by the VOD server to the user has the characteristics of large flow, constant bandwidth requirement and real-time transmission. In particular, the data is only transmitted in one direction from the VOD server to the set-top box, which is very suitable for transmission through the HFC network. The invention integrates the mobile communication network and the HFC network to realize the VOD function, exerts their respective transmission characteristics and advantages, and can quickly and large-scale realize the VOD service without the need for two-way reconstruction of cable TV or new IP network.

二、VOD实现的方法Second, the method of VOD realization

通过把移动通信网络作为信息回传通道，利用HFC作为节目流下行通道，VOD可以按照以下步骤实现：By using the mobile communication network as the information return channel and using HFC as the downstream channel of the program stream, VOD can be realized according to the following steps:

1、用户用注册的移动电话内置的WAP浏览器通过移动通信网络访问EPG服务器，提交查询节目清单和节目信息等请求；1. The user uses the built-in WAP browser of the registered mobile phone to access the EPG server through the mobile communication network, and submits requests for querying program lists and program information;

2、EPG服务器在用户的WAP请求中可以提取出用户的移动电话号码，从而确定该用户的有线数字电视用户号，以及其所在区域的IP-QAM；2. The EPG server can extract the user's mobile phone number from the user's WAP request, thereby determining the user's cable digital TV user number and the IP-QAM of the area where it is located;

3、EPG服务器通过查询节目数据库，反馈给用户包含节目信息的WAP页面；3. The EPG server feeds back the WAP page containing program information to the user by querying the program database;

4、对于选定节目，用户在移动电话的WAP页面向EPG服务器提交对选定节目的点播请求；4. For the selected program, the user submits an on-demand request for the selected program to the EPG server on the WAP page of the mobile phone;

5、EPG服务器接收到点播请求后，选择用户所在区域的IP-QAM设备的一个具有足够空闲带宽的播出频点，以及在这个频点上未使用的节目号，并按照该IP-QAM设备的播出频点编号和节目号与节目流接收UDP端口的映射规则计算出节目流接收UDP端口；5. After the EPG server receives the on-demand request, it selects a broadcast frequency point with enough free bandwidth of the IP-QAM equipment in the area where the user is located, and an unused program number on this frequency point, and according to the IP-QAM equipment Calculate the program stream receiving UDP port according to the mapping rules of the broadcast frequency point number and program number and the program stream receiving UDP port;

6、EPG服务器把用户号和其点播节目的频道频点以及节目号发送给声明服务器，声明服务器打包为TS流，推向所有HFC分前端的QAM设备，在一个称之为VOD主频点的保留频道上持续播出；6. The EPG server sends the user number, channel frequency and program number of the programs they order to the declaration server, and the declaration server packs them into TS streams and pushes them to all HFC front-end QAM devices. On-going broadcast on reserved channels;

7、EPG服务器同时把用户点播节目信息、该用户机顶盒所在区域的TP-QAM设备的IP地址和为其分配的接收用UDP端口号发送给VOD服务器；7. The EPG server sends the user's on-demand program information, the IP address of the TP-QAM device in the area where the user's set-top box is located, and the UDP port number assigned to it to the VOD server;

8、VOD服务器读取被点播节目文件，形成节目流，发送到目的IP-QAM的指定UDP端口；8. The VOD server reads the requested program file, forms a program stream, and sends it to the designated UDP port of the destination IP-QAM;

9、IP-QAM根据接收节目流的UDP端口号重新映射出播出频点编号和节目号，以及该节目的PMT PID和音视频流的PID等参数，按照这些参数修改节目流中对应的参数，并调制到该播出频道上，在该区域的有线电视同轴电缆网上广播；9. IP-QAM remaps the broadcast frequency point number and program number according to the UDP port number of the received program stream, as well as parameters such as the PMT PID of the program and the PID of the audio and video stream, and modifies the corresponding parameters in the program stream according to these parameters. And modulate to the broadcast channel, and broadcast on the cable TV coaxial cable network in this area;

10、用户把机顶盒切换到VOD模式，即接收VOD主频点，持续搜索其用户号；10. The user switches the set-top box to the VOD mode, that is, receives the VOD main frequency point, and continuously searches for its user number;

11、当机顶盒接收到其用户号，并提取相应的频道频点和节目号，然后切换到该频点，接收该节目号的节目，进行解码回放，实现点播；11. When the set-top box receives the user number, extracts the corresponding channel frequency and program number, then switches to the frequency point, receives the program of the program number, decodes and plays back, and realizes on-demand;

12、在点播过程中，用户移动电话进入播放控制WAP界面，包括暂停、继续、快进、快退、定位播放和停止等功能，当用户需要进行播放控制时，把所选择的控制请求发送给EPG服务器；12. During the process of ordering, the user's mobile phone enters the playback control WAP interface, including functions such as pause, continue, fast forward, fast rewind, positioning playback, and stop. When the user needs to perform playback control, the selected control request is sent to EPG server;

13、EPG接收到控制请求后，转发给VOD服务器，VOD服务器执行相应指令；13. After the EPG receives the control request, it forwards it to the VOD server, and the VOD server executes the corresponding command;

14、当节目播放完毕或者用户发送停止指令后，声明服务器停止发送该用户的用户号和这次点播的频点和节目号等信息，点播完毕。14. When the program is finished playing or the user sends a stop command, declare that the server stops sending information such as the user number of the user, the frequency point and the program number of this order, and the order is completed.

三、用户身份认证和节目流路由方法3. User identity authentication and program stream routing method

在进行视频点播时，VOD服务器需要把用户点播的节目流发送给用户所在区域的IP-QAM设备。因此必须在通过用户移动电话的访问获得用户的身份，从而判断用户机顶盒所属的IP-QAM，使VOD服务器能够把节目流路由到正确的IP-QAM上。When performing video on demand, the VOD server needs to send the program stream requested by the user to the IP-QAM equipment in the area where the user is located. Therefore, the identity of the user must be obtained through the access of the user's mobile phone, thereby judging the IP-QAM to which the user's set-top box belongs, so that the VOD server can route the program stream to the correct IP-QAM.

在VOD系统中按照以下方式实现用户的身份认证和节目流路由：In the VOD system, user identity authentication and program stream routing are realized in the following ways:

1、当用户开通服务时，记录其数字电视用户号和注册的移动电话号码，以及其所属区域的IP-QAM，其中数字电视用户号是用户的标识号，可以是用户的条件接收卡号，移动电话号码要和数字电视用户号一一对应；1. When the user subscribes to the service, record his digital TV user number and registered mobile phone number, as well as the IP-QAM of the area to which he belongs. The digital TV user number is the user's identification number, which can be the user's conditional access card number. The telephone number should correspond one-to-one with the digital TV user number;

2、用户通过移动电话访问EPG服务器时，EPG服务器在其WAP请求中提取出用户的移动电话号码，通过步骤1中记录的信息可以确定用户身份，即有线数字电视用户号，以及所属区域的IP-QAM；2. When a user accesses the EPG server through a mobile phone, the EPG server extracts the user's mobile phone number from its WAP request, and the user's identity can be determined through the information recorded in step 1, that is, the cable digital TV user number and the IP address of the area to which it belongs. - QAM;

3、EPG服务器接收到点播请求后，选择用户所在区域的IP-QAM设备的一个具有足够空闲带宽的播出频点，以及在这个频点上未使用的节目号，并按照该IP-QAM设备的播出频点编号和节目号与节目流接收UDP端口的映射规则计算出节目流接收UDP端口；3. After the EPG server receives the on-demand request, it selects a broadcast frequency point with enough free bandwidth of the IP-QAM equipment in the user's area, and the unused program number on this frequency point, and according to the IP-QAM equipment Calculate the program stream receiving UDP port according to the mapping rules of the broadcast frequency point number and program number and the program stream receiving UDP port;

4、EPG服务器把用户点播节目信息、该用户机顶盒所在区域的IP-QAM设备的IP地址和其接收节目流UDP端口号发送给VOD服务器；4. The EPG server sends the user's on-demand program information, the IP address of the IP-QAM device in the area where the user's set-top box is located, and the UDP port number for receiving the program stream to the VOD server;

5、VOD服务器读取被点播节目文件，形成节目流，发送到目的IP-QAM的指定UDP端口；5. The VOD server reads the requested program file, forms a program stream, and sends it to the designated UDP port of the destination IP-QAM;

6、IP-QAM根据接收节目流的UDP端口号重新映射出播出频点编号和节目号，以及该节目的PMT PID和音视频流的PID等参数，按照这些参数修改节目流中对应的参数，并调制到该播出频道上，在该区域的有线电视同轴电缆网上广播；6. IP-QAM remaps the broadcast frequency point number and program number according to the UDP port number of the received program stream, as well as the PMT PID of the program and the PID of the audio and video stream and other parameters, and modifies the corresponding parameters in the program stream according to these parameters. And modulate to the broadcast channel, and broadcast on the cable TV coaxial cable network in this area;

7、用户机顶盒能够通过同轴电缆接收到其点播的节目流，进行解码回放。7. The set-top box of the user can receive the stream of the program on demand through the coaxial cable, and perform decoding and playback.

四、保证VOD从头播放的方法4. How to ensure VOD playback from the beginning

由于点播指令发送和点播节目流接收是由移动电话和机顶盒2个分立设备执行，当VOD服务器执行用户点播指令开始发送节目流时，机顶盒可能因为没有及时进入VOD模式导致错过节目开头。为了避免这个问题，本发明提出以下方法保证用户收看的完整性：Since the VOD command sending and VOD program stream receiving are performed by two separate devices, the mobile phone and the set-top box, when the VOD server executes the user’s VOD command and starts to send the program stream, the set-top box may miss the beginning of the program because it does not enter the VOD mode in time. In order to avoid this problem, the present invention proposes the following methods to ensure the integrity of the user's viewing:

1、EPG服务器接收到用户移动电话的点播请求，返回一个让用户确认播放的WAP网页；1. The EPG server receives the on-demand request from the user's mobile phone, and returns a WAP web page for the user to confirm the playback;

2、VOD服务器接收到点播指令后，向目的IP-QAM持续发送测试节目流，测试节目流内容为提示用户通过移动电话发送确认点播开始请求；2. After the VOD server receives the on-demand instruction, it continues to send the test program stream to the destination IP-QAM. The content of the test program stream is to prompt the user to send a confirmation on-demand start request through the mobile phone;

3、机顶盒进入VOD模式，并接收到测试节目流显示到电视机屏幕上，表明已经处于VOD接收就绪状态；3. The set-top box enters the VOD mode, and receives the test program stream and displays it on the TV screen, indicating that it is ready for VOD reception;

4、这时用户通过移动电话向EPG服务器发送确认播放请求；4. At this time, the user sends a confirmation play request to the EPG server through the mobile phone;

5、EPG服务器接收到用户的确认播放请求，指示VOD服务器开始播出用户点播的节目流；5. The EPG server receives the user's confirmation play request and instructs the VOD server to start broadcasting the program stream requested by the user;

6、由于机顶盒已经处于VOD接收就绪状态，保证了节目流能够被完整地接收。6. Since the set-top box is already in the ready state for VOD reception, it is guaranteed that the program stream can be completely received.

五、机顶盒迁移的处理方法5. Processing method of set-top box migration

当用户搬家等情况下，机顶盒的接入位置会发生变化，不在原来的IP-QAM所覆盖的区域。为了保证用户能够继续进行点播，本专利提出了以下处理方法：When the user moves, etc., the access location of the set-top box will change, and it will not be in the area covered by the original IP-QAM. In order to ensure that users can continue on-demand, this patent proposes the following processing methods:

1、各IP-QAM在其播出频点持续向本区域的有线电视同轴电缆网广播其标识号，同时声明服务器在其VOD主频点中持续地向全网播出所有IP-QAM的播出频点列表；1. Each IP-QAM continuously broadcasts its identification number to the cable TV coaxial cable network in this area at its broadcast frequency point, and at the same time declares that the server continuously broadcasts all IP-QAM videos to the entire network at its VOD main frequency point Broadcast frequency list;

2、机顶盒在进入VOD模式时，首先切换到在非易失存储器中保存的IP-QAM的播出频点，接收IP-QAM广播的IP-QAM标识号；2. When the set-top box enters the VOD mode, it first switches to the IP-QAM broadcast frequency point stored in the non-volatile memory, and receives the IP-QAM identification number of the IP-QAM broadcast;

3、如果接收到的IP-QAM标识号与其在非易失存储器中保存的IP-QAM标识号相同，则表明机顶盒位置未发生变化，执行步骤10；3. If the received IP-QAM identification number is the same as the IP-QAM identification number stored in the non-volatile memory, it indicates that the position of the set-top box has not changed, and step 10 is performed;

4、如果接收到的IP-QAM标识号与其在非易失存储器中保存的IP-QAM标识号不同，则表明机顶盒位置发生变化，然后从步骤8向下执行；4. If the received IP-QAM identification number is different from the IP-QAM identification number stored in the non-volatile memory, it indicates that the position of the set-top box has changed, and then execute from step 8 downward;

5、如果在一定时间内接收不到IP-QAM标识号广播，表明机顶盒迁移到一个IP-QAM播出频点不同的区域；5. If the IP-QAM identification number broadcast cannot be received within a certain period of time, it means that the set-top box has migrated to an area with a different IP-QAM broadcast frequency;

6、机顶盒切换到VOD主频点接收全部IP-QAM播出频点列表的广播；6. The set-top box switches to the VOD main frequency point to receive the broadcast of all IP-QAM broadcast frequency point lists;

7、机顶盒逐一切换到各IP-QAM的播出频点，直到能够接收到IP-QAM的标识号广播声明；7. The set-top box switches to each IP-QAM broadcast frequency point one by one, until it can receive the broadcast statement of the IP-QAM identification number;

8、机顶盒把接收到的IP-QAM标识号在电视屏幕上显示，指示用户通过移动电话进入IP-QAM设置的WAP页面，输入该IP-QAM标识号，提交给EPG服务器；同时机顶盒把IP-QAM标识号和其播出频点保存在非易失存储器中；8. The set-top box displays the received IP-QAM identification number on the TV screen, instructing the user to enter the WAP page set by IP-QAM through the mobile phone, input the IP-QAM identification number, and submit it to the EPG server; at the same time, the set-top box sends the IP-QAM The QAM identification number and its broadcast frequency are stored in non-volatile memory;

9、EPG服务器接收到IP-QAM标识号更新信息，修改相应记录，以后发生的点播节目流将会发送给当前机顶盒所在区域的IP-QAM，保证机顶盒能够接收到点播流；9. The EPG server receives the update information of the IP-QAM identification number and modifies the corresponding records. The on-demand program streams that will occur in the future will be sent to the IP-QAM in the area where the current set-top box is located to ensure that the set-top box can receive the on-demand streams;

10、机顶盒切换到VOD主频点，以接收点播节目的播出频点和节目号，实现视频点播。10. The set-top box switches to the VOD main frequency point to receive the broadcast frequency point and program number of the on-demand program to realize video on-demand.

除说明书所述的技术特征外，均为本专业技术人员的已知技术。Except for the technical features described in the instructions, all are known technologies by those skilled in the art.

Claims (6)

1. a method for requesting unidirectional wired TV set-top box video that utilizes mobile communications network passback comprises 1) inquiry and send the method for program stream; 2) user identity En Ruite and program stream method for routing; 3) method of one-way set-top box selective reception program stream in the video request program of Shi Xianing, 4) the complete method of watching of assurance user; 5) support set-top box between different IP-QAM, to move, it is characterized in that, mobile phone is carried out the accessory terminal of video request program control as the user, utilize the two-way communications capabilities of mobile communications network, as user inquiring and send the program request order return path, server produces program stream and goes downwards to the subscriber computer top box by traditional hfc plant, making has only the set-top box of cable digital TV receiving function can realize Full Featured video request program, the VOD system: head end server wherein comprises VOD server, EPG server harmony prescribed server; User terminal comprises one-way set-top box and mobile phone; Information return path, i.e. mobile communications network; The program stream down going channel, promptly hfc plant comprises the QAM and the IP-QAM equipment that are positioned at sub-headend, wherein the EPG server provides WAP service, program inquiry service and receives the service of user's order request to mobile phone by connecting mobile communications network.

2, method according to claim 1 is characterized in that, the method for inquiry and transmission program stream; May further comprise the steps:

A, user utilize the WAP browser of mobile phone to pass through mobile communications network accessing video vod server end group in the navigation server of WAP server, inquiry program inventory and programme information;

B, EPG server return the information that the user needs by mobile communications network to user's mobile phone;

C, user submit order request by the WAP page of mobile phone to the EPG server;

D, EPG server controls ordering server carry out rf modulations, the cable tv coax online broadcast in this locality to the program stream IP-QAM that the IP-QAM of subscriber computer top box affiliated area sends user's program request;

E, subscriber computer top box receive the radio-frequency (RF) broadcast from cable tv coax, and the program of playback institute program request.

3, method according to claim 1, it is characterized in that, authenticating user identification and program stream method for routing, be user's Mobile Directory Number and number binding of number TV user, the EPG server obtains Mobile Directory Number from the WAP request that user's mobile phone sends, carry out the identification of cable TV subscriber's identity, and the IP-QAM of definite this user region, guarantee that the VOD server is routed to correct IP-QAM to program stream, make flow through IP-QAM broadcasting of program can cover the subscriber computer top box, further comprising the steps of:

A, when user's turn up service, write down the Mobile Directory Number of its digital cable customers number and registration, with and the IP-QAM of affiliated area, wherein digital cable customers number is user's a identification number, be user's condition receiving card number, Mobile Directory Number is number corresponding one by one with digital cable customers;

When b, user visited the EPG server by mobile phone, the EPG server extracted the user's mobile phone number in its WAP request, determine user identity by the information that writes down among the step a, i.e. the IP-QAM of cable digital TV user number, and affiliated area;

After c, EPG server receive order request, select a broadcast frequency of the IP-QAM equipment of user region with enough idle bandwidths, and on this frequency untapped program number, and calculate program stream according to the mapping ruler that the broadcast frequency numbering of this IP-QAM equipment and program number and program stream receive udp port and receive udp port;

D, EPG server number send to the VOD server to the IP address of the IP-QAM equipment of user's request program information, this subscriber computer top box region and its program receiving stream udp port;

E, VOD server read by the request program file, form program stream, send to the appointment udp port of purpose IP-QAM;

F, IP-QAM are according to the udp port of program receiving stream number remap out broadcast frequency numbering and program number, and the PMT PID of this program and the pid parameter of audio/video flow, according to corresponding parameters in these parameter modification program streams, and be modulated on this broadcast channel, in this regional cable tv coax online broadcast;

G, subscriber computer top box can receive the program stream of its program request, the playback of decoding by coaxial cable

4, method according to claim 1, it is characterized in that, the method of one-way set-top box selective reception program stream in the video request program that realizes, by the statement server, grasp all users' of current program request cable digital TV user number and broadcast channel and the program number information of its request program stream on IP-QAM, and on a reserved channel that becomes VOD dominant frequency point to whole cable television network broadcasting, the set-top box of carrying out program request can be received, and the broadcast channel frequency of acquisition institute request program stream and the essential information of program number, just receive the program stream of its program request according to these pager top boxs, its step is as follows:

A, receive the request of user's electric wave after, the EPG server sends to the statement server to the channel frequency of the cable digital TV user number of this program of program request and selected program and program number, the statement server is packaged as TS stream, push the QAM equipment of all HFC sub-headends to, on a reserved channel that is referred to as VOD dominant frequency point, in whole cable television network, continue to broadcast;

B, user switch to the VOD pattern to set-top box, promptly are in to receive VOD dominant frequency dotted state, continue the cable digital TV user number of this user of search in statement server broadcast content;

C, when set-top box receives its cable digital TV user number, obtain this request program of this user and broadcast channel frequency and program number;

D, set-top box switch to the broadcast channel frequency that step c obtains receiving frequency, and extract the PMT and the audio/video information of this program according to program number, and the playback of decoding realizes program request.

5, method according to claim 1, it is characterized in that, guarantee the complete method of watching program of user, be that the VOD server is before the program stream that broadcasts institute's request program, test the broadcast of stream, after having only the user to carry out affirmation that program request begins to play, the program stream that the VOD server just sends institute's request program is in order to prevent that the user from missing the program beginning and guaranteeing that the user is complete and watch that processing method is as follows:

After a, user submitted order request to, mobile phone enters confirmed to play the page, and the prompting user submits to after the content that TV display reminding user plays again and confirms playing request;

After b, VOD server receive order request, at first send the test program stream to IP-QAM, content is that the prompting user sends the affirmation playing request by mobile phone;

C, after set-top box enters the VOD pattern and after receiving the test program stream, show information to the user at video screen;

D, user submit in the WAP of the mobile phone page and confirm playing request according to prompting;

E, EPG server receive the confirmation playing request, and control VOD server begins to send the programme content of institute's program request;

F, subscriber computer top box receive request program.

6. method according to claim 1 is characterized in that, the processing method of set-top box migration is to support set-top box to move between different IP-QAM, makes the set-top box after request program stream can be properly routed to migration, and treatment step is as follows:

A, each IP-QAM broadcast frequency at it to be continued to broadcast its identification number to the cable tv coax net of one's respective area, states that simultaneously server broadcasts the broadcast frequency tabulation of all IP-QAM constantly to the whole network in its VOD dominant frequency point;

B, set-top box at first switch to the broadcast frequency of the IP-QAM that preserves in nonvolatile storage when entering the VOD pattern, receive the IP-QAM identification number of IP-QAM broadcasting;

If the IP-QAM identification number that IP-QAM identification number and its that c receives are preserved is identical, show that then the set-top box position does not change execution in step j in nonvolatile storage;

If the IP-QAM identification number that IP-QAM identification number and its that d receives are preserved is different, show that then the set-top box position changes, and carries out from step h then downwards in nonvolatile storage;

If e does not receive IP-QAM identification number broadcasting within a certain period of time, show that set-top box moves to an IP-QAM and broadcast the different zone of frequency;

F, set-top box switch to VOD dominant frequency point and receive the broadcasting that whole IP-QAM broadcast the frequency tabulation;

G, set-top box switch to the broadcast frequency of each IP-QAM one by one, up to the identification number broadcasting statement that can receive IP-QAM;

H, set-top box show the IP-QAM identification number that receives that the indication user enters the WAP page that IP-QAM is provided with by mobile phone, imports this IP-QAM identification number, submits to the EPG server on video screen; Set-top box is kept at IP-QAM identification number and its broadcast frequency in the nonvolatile storage simultaneously;

I, EPG server receive IP-QAM identification number lastest imformation, revise respective record, and the request program stream that takes place will send to the IP-QAM of current set-top box region later on, guarantee that set-top box can receive program stream.

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