D2D video distribution and precaching method based on network coding

A network coding and pre-caching technology, which is applied in the field of data transmission and caching of multi-hop D2D networks, can solve the problems of not considering cache redundancy and poor mobility resistance

Active Publication Date: 2017-07-21
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In addition, the transmission interference sensing method is adopted to improve the caching effect, but this scheme is only aimed at the single-hop D2D network, a...

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  • D2D video distribution and precaching method based on network coding
  • D2D video distribution and precaching method based on network coding
  • D2D video distribution and precaching method based on network coding

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Embodiment 1

[0088] Such as Figure 4As shown, there are 7 network nodes in the figure, the rectangular nodes are user user nodes, and the other device nodes in the 6 circular node network, the number inside the circle is the node ID, and the number above the circle is the user cached by the node The number of network encoding blocks of a data segment to be obtained.

[0089] Suppose the preset network coding window K=12, the cache weight expression W=n0+0.8*n1+0.5n2; the cache threshold W0=12;

[0090] Since each node in the network will periodically exchange its own cache information, it is assumed that the range of cache information flooding is two hops; therefore, for each node in the network, the cache information of nodes within the range of two hops is of great value to the user. known. So n0=0, n1=2+2+2=6, n2=4+4+4=12;

[0091] According to the preset cache weight formula, the cache weight of target content segment data is W=n0+0.8*n1+0.5n2=4.8+6=10.8

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Abstract

The invention requests to protect a D2D video distribution and precaching method based on network coding. The method comprises the following steps: a multi-hop D2D network is firstly created, a node maintains a neighbor cache information table, each device terminal node periodically floods the own cache information message in a certain range, and a neighbor device receives the message and then updates the neighbor cache information table according to the message; when a user node wants to acquire a certain video, a video acquisition request is sent to all seed nodes that own the video files according to the neighbor cache information table, the seed nodes send the coded video data to the user node after receiving the request and add related packet header information; and the video coding data VDData is subjected to multi-hop transmission and cache in the network, and an intermediate node implements recoding, forwarding and precaching on the video coding data VDData until the video coding data reaches a destination user node. According to the D2D video distribution and precaching method disclosed by the invention, the local cache hit rate of D2D can be successfully increased, and the load of base stations can be reduced to a maximum extent.

Description

technical field [0001] The invention belongs to the field of data transmission and buffering of a multi-hop D2D network, in particular to a video data distribution and pre-caching method in a wireless mobile multi-hop D2D network. Background technique [0002] The rapid development of mobile streaming media services makes it difficult for the traditional streaming media architecture model based on pure base station access to meet the growing demand for streaming media bandwidth, restricting the large-scale application and promotion of mobile streaming media services, and seriously affecting the development of mobile streaming media services. Service quality and reliability. For this reason, people have proposed a method of using D2D communication technology to offload cellular traffic and sharing video data in a D2D manner in the network to relieve the pressure on the base station. [0003] In order to improve the probability that mobile users find interesting video files i...

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Application Information

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IPC IPC(8): H04N21/231H04N21/63H04N21/647H04L29/08H04L1/00
CPCH04L1/0057H04L1/0076H04L67/1078H04L67/108H04N21/23106H04N21/632H04N21/64723H04L67/568
Inventor 曾帅胡喜范喜艳赵国锋唐红
Owner CHONGQING UNIV OF POSTS & TELECOMM
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