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A method of multicasting svc video in wireless local area network

A wireless local area network and video technology, applied in image communication, selective content distribution, electrical components, etc., can solve the problems of low throughput and users' inability to obtain high speed, and achieve the effect of improving throughput and reducing restrictions

Inactive Publication Date: 2016-12-28
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the present invention aims to provide a multicast method of SVC video in a wireless local area network, thereby improving the problem that the throughput in the existing local area network SVC video multicast is low and users with good channel conditions cannot obtain high rates

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  • A method of multicasting svc video in wireless local area network
  • A method of multicasting svc video in wireless local area network
  • A method of multicasting svc video in wireless local area network

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Embodiment

[0058] During this multicast process, the service to be sent by the sender is a frame of video service based on SVC encoding, such as figure 2 Shown is the hierarchical structure of SVC encoding, it should be noted that, in this embodiment, the frame is divided into N=3 layers of video sub-streams, and the known data volume of each layer of video sub-streams is c 1 =0.01Mb, c 2 =0.04Mb, c 3 =0.16Mb, there are four users (defined as 1, 2, 3, 4) to receive this service, and the link transmission rate of the users is v 1 =1Mb / s, v 2 =2Mb / s, v 3 =5.5Mb / s, v 4 =11Mb / s, the playback frame interval of the player is t f =50ms.

[0059] The grouping process is as follows:

[0060] (1) n=1,t avi (1)=t f =50ms, so that Q(1)={1,2,3,4} can be obtained. Therefore, users 1, 2, 3, and 4 are users in the first multicast group, and it can be obtained that G 1 =v 1 =1Mb / s.

[0061] (2) n=2, n≠N+1, if the conditions for ending the grouping are not met, calculate Thus it can be dra...

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Abstract

The invention discloses a multicast method for a scalable video coding (SVC) video in a wireless local area network. The multicast method comprises the following steps of: (1) setting n to be 1 first; (2) firstly calculating the available time for transmitting the nth layer by a sending end, and obtaining a user set for transmitting data of the nth layer; (3) if the set is not an empty set, determining that users in the set are users in the nth multicast group, obtaining a transmission rate of the multicast group, adding 1 into n, if the set is the empty set, ending a grouping process, and setting J to be n-1; (4) if n is equal to N+1, ending the grouping process, and setting J to be n-1, otherwise, recycling the steps; and (5) transmitting a first layer of video substream to the first multicast group at the rate G1, and transmitting a second layer of video substream to the second multicast group at the rate of G2 until the Jth layer of video substream is transmitted. The problems of lower SVC video multicast throughput and influence of low-rate users on the multicast rate of high-rate users in an existing wireless local area network are solved.

Description

technical field [0001] The invention relates to the technical field of multimedia digital network transmission, in particular to a method for multicasting SVC video in a wireless local area network, which can be used for multicasting SVC video services in the wireless local area network. Background technique [0002] Wireless local area network (WLAN) refers to a communication network composed of multiple network devices connected wirelessly in a certain area by using radio frequency technology. The wireless local area network based on the 802.11 standard allows the use of the ISM frequency band for wireless connection, which facilitates the use of WLAN. Compared with wired LAN, wireless LAN has many advantages: such as simple networking, high network flexibility, strong mobility of equipment, low cost, easy network expansion, easy network planning and adjustment, etc. This also makes WLAN widely used. [0003] Scalable Video Coding (SVC) can split the video stream into a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/6405H04N21/647H04N21/434
Inventor 李红艳金麟李建东马英红刘伟侯蓉晖刘勤
Owner XIDIAN UNIV