Channel switching method, device and system

Abstract

The embodiment of the invention discloses a channel switching method, device and system. The method comprises the following steps: judging whether the video streaming, which promotes propelling the cache in a unicasting mode, is synchronous with the channel video streaming propelled to the client by the network node in a multicasting mode, informing the client to transmit the request for joining in the multicasting group to realize the quick channel switching, and dynamically adjusting the rate of the propelled video streaming in a unicasting mode. The invention increases the concurrence connection number of the client, enhances the efficiency for channel switching, reduces the cost for allocation and operation of the IPTV system, enables the channel switching scheme to have universality and expandability and improves the user experience.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a channel switching method, device and system. Background technique [0002] IPTV (Internet Protocol Television, Internet Protocol Television) is a brand-new technology that utilizes a broadband cable network and integrates various technologies such as the Internet, multimedia, and communication to provide home users with various interactive services including digital services. With the increase in popularity, IPTV has been recognized worldwide. However, IPTV users and operators have been troubled by the long time delay when switching channels. [0003] Factors that lead to channel switching delay include: the time spent leaving the original channel multicast group, the time consumed by joining a new channel multicast group, the time consumed by STB (Set Top Box, set-top box) cache filling data, and the time consumed by waiting for I frames . Among them, the tim...

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Problems solved by technology

[0007] (1) Due to the existing technology, the terminal initiates a request to join the multicast group. When the terminal joins the multicast group too early, it will cause two streams to be sent in the same time period, one is a unicast stream and the other is a group stream. If the terminal joins the multicast group too late, it will take too long for the network cache device to process the channel switching of a single user, which will affect the network cache at the same time. The device handles the concurrent number of fast channel switching, reducing efficiency

[0008] (2) When receiving unicast streams in the existing solution, the transmission rate is negotiated between the terminal and the buffer device, which increases the time for the buffer device to process a single channel switch and reduces the transmission efficiency of the unicast stream

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