High coding opportunity bidirectional access method based on cache information assistance

Abstract

The invention provides a high coding opportunity bidirectional access method based on cache information assistance. The method is mainly applied to a two-hop relay network, and mainly comprises a coding matching stage for sending a control message and a data transmission stage after the matching; three mechanisms as follows are adopted: four handshakes are changed as twice handshakes, the cache information assistance improves the coding opportunity, and the virtual cache area is updated by modifying a frame format; the first new mechanism and the second new mechanism are worked at the coding matching stage, and the third new mechanism is worked at the data transmission stage. By using above three new mechanisms, the new access method provided by the invention can reduce unnecessary expenditure in the unnecessary message interaction process, the coding opportunity can be effectively improved, thereby realizing the aims of reducing the data frame average delay and increasing the networkthroughput by sufficiently utilizing the network coding technology on the whole.

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...

AI Technical Summary

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

Images