Digital television video on demand system and on demand method

Abstract

The invention discloses a digital television video on demand system, which comprises a video server, a cable modem terminal system (CMTS), a Cable Modem and an interactive digital set-top box. A policy server and an on-demand bandwidth management server are sequentially connected between the CMTS and the video server, wherein the policy server is used for judging whether a current network permits the addition of new user access or not and performing priority judgment; and the on-demand bandwidth management server converts a user traffic request into a packet cable multimedia (PCMM) standard protocol recognizable for both the policy server and the CMTS, returns a session creation request message to the video server to confirm whether an on demand request is transmitted or not. Compared with currently adopted schemes, a system topological structure diagram can avoid network congestion caused by the simultaneous downlink transmission of a plurality of pieces of user data traffic generated by an overgreat number of on demand users at prime time and effectively solve the problem of CMTS congestion by the intelligent selection of the policy server to make the system run stably and reliably.

Description

technical field [0001] The invention belongs to the field of digital television, and in particular relates to a digital television video-on-demand system and an on-demand method. Background technique [0002] With the popularization of digital TV, in order to meet people's individual needs for TV programs, various TV operators have launched a video-on-demand system, which allows users to order their favorite programs at home at any time according to their hobbies. This service is welcomed by the majority of users . [0003] The currently used VOD system topology is as follows: figure 1 As shown, the CMTS (Cable Modem Terminal Systems, cable modem termination system) is connected to the video server side, the CMTS is connected to the Cable Modem (cable modem), and the Cable Modem (CM, cable modem) is connected to each user's set-top box for For video on demand. After the user sends an on-demand request through the set-top box, the request is sent to the CMTS through the Ca...

AI Technical Summary

Problems solved by technology

[0004] With this topology, video on demand can be well completed. However, with the increase of digital TV users, the downlink bandwidth of each CMTS is limited. During the peak period of video on demand, when too many users send video When an on-demand request is made, the downlink of the CMTS will experience network congestion, which will affect the normal viewing of programs of all users connected to the CMTS, and the reliability of the system operation will decrease.

Images