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A Caching Mechanism for Enhancing Coding Gain in Wireless Opportunistic Networks

A network coding and opportunistic technology, applied in wireless communication, network traffic/resource management, digital transmission system, etc., can solve the problems of ignoring the optimization of decoding packet pool cache mechanism and maximizing cache utility, so as to improve throughput performance gain, The effect of improving decoding utility and reducing network overhead

Inactive Publication Date: 2017-04-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most previous studies have focused on increasing encoding opportunities and encoding algorithm design, while ignoring the caching mechanism of optimizing the decoded packet pool and maximizing the caching utility

Method used

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  • A Caching Mechanism for Enhancing Coding Gain in Wireless Opportunistic Networks
  • A Caching Mechanism for Enhancing Coding Gain in Wireless Opportunistic Networks
  • A Caching Mechanism for Enhancing Coding Gain in Wireless Opportunistic Networks

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Embodiment Construction

[0023] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but the content protected by the present invention is not limited to the following description.

[0024] A caching mechanism that improves the gain of wireless opportunistic network coding, which jointly considers the caching time of data packets and the replacement of data packets. The cache management mechanism of the node for the decoding packet pool, including such as figure 1 "X" topology (X-topology), "Bob-Alice" topology (Bob-Alice-topology), "Y" topology (Y-topology), and "Cross" topology (Cross-topology) shown ; it includes the following steps:

[0025] The cache management goal is to maximize the total decoding utility of the cache system D B :

[0026]

[0027]

[0028] where s, B, T, t i ,D i (t i ) are the size of the packet, the cache size in units of packets, the working time of the cache system, the cache time of the ...

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Abstract

The invention discloses a caching mechanism for improving coding gain of a wireless opportunistic network, which comprises the following steps: classify the data packets buffered for the same time in a decoded packet pool into one category, and represent the number of data packets in the first category of data packets, Thus, the total decoding utility target of the maximum cache system is transformed into the maximum cache system decoding efficiency; the distribution function of the coded packet arrival delay is defined as the probability that the coded packet arrival delay is less than or equal to seconds, when each data packet in the decoded packet pool caches a When the cache time is optimized and the decoding efficiency is maximized, the system decoding efficiency of the decoding packet pool is also maximized. The present invention proposes a specific implementation method of a distributed cache management mechanism, which makes up for the deficiencies in the existing research on opportunistic network coding and decoding packet pool cache management, improves the decoding effectiveness of cached data packets, and effectively improves the throughput of opportunistic network coding rate performance gain.

Description

technical field [0001] The invention relates to a caching mechanism for improving coding gain of a wireless opportunistic network. Background technique [0002] To improve the throughput and energy efficiency of wireless networks, opportunistic network coding is applied as a promising technique that can significantly improve network performance. In its application, the node needs to cache all the data packets it detects or the data packets sent by it in the local packet pool for possible decoding needs in the future. Since opportunistic network coding adopts an XOR-based coding method, when a coding node needs to encode multiple data packets together, it is necessary to ensure that each receiving node of the coded packet has all the other data packets except the data packet it needs. The data packet can be decoded to obtain the required data packet. Therefore, the research object of the present invention is the caching mechanism in the application of opportunistic network ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04W28/02
Inventor 冯钢刘青龙秦爽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA