A High Coding Opportunity Bidirectional Access Method Based on Cache Information Assistance

Abstract

The present invention proposes a two-way access method with high coding opportunities based on cache information assistance, which is mainly applied in two-hop relay networks, and mainly includes two stages of code matching for sending control messages and data transmission after matching. Three new mechanisms: "replacement from four-way handshake to two-way handshake", "cache information assists in improving coding opportunities", "updating virtual buffer area by modifying frame format"; the first and second new mechanisms work in the coding matching stage , the third new mechanism works in the data transmission stage. By using the above three new mechanisms, the new access method proposed by the present invention can reduce the unnecessary control overhead of the message interaction process, and can effectively improve the coding opportunities, so that the overall Make full use of network coding technology to achieve the purpose of reducing the average delay of data frames and increasing the throughput of the network.

Description

technical field [0001] The present invention belongs to the field of wireless communication technology, and the main application scenario is a two-hop relay network, and the main application is the scenario of data exchange between a source node and a destination node using a relay node. More specifically, it relates to a cache-based Information-assisted high coding opportunity two-way access method. Background technique [0002] Network coding technology is an information exchange technology that effectively integrates encoded data and routing information. Its main idea is that the relay node forwards the intercepted or cached data to other nodes after encoding, and other nodes follow the same operation mode until the data frame reaches the destination terminal. Network coding technology can achieve the purpose of enhancing network performance by increasing the amount of information per unit time slot. The intermediate node encodes and sends the received information, theor...

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Problems solved by technology

[0007] In view of the research on the two-way access method based on network coding in literature [3], in this scheme, judging whether there is data exchange requires a four-way handshake, which leads to a large control overhead, and does not make full use of historical cache information to accurately judge coding opportunities As a result, the encoding is not fully utilized. For this situation, it is necessary to propose a new access method. If the information of the data frame is cached, it can be judged whether there is an encoding opportunity through two handshakes, and it solves the problem through the flow compensation mechanism. to increase the number of encoding opportunities, which can greatly improve network throughput

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