Exponential backoff multiple access method in cooperation with network-assisted diversity

Abstract

The invention discloses an exponential backoff multiple access method in cooperation with network-assisted diversity. The method comprises: (1) allocation of an orthogonal overlapping pilot sequence to nodes requesting for access, including: selecting an orthogonal overlapping pilot sequence and allocating the orthogonal overlapping pilot sequence to the node requesting for access to the network for the first time as the identity identification and channel estimation of the node; (2) the access channel backoff, including: monitoring the channel when a data packet in the network nodes needs to be transmitted, and subjecting the node to countdown backoff when the idle period of the monitored channel lasts for an interval length between distributed frames; and (3) data packet transmission, including: transmitting the data packet of the node needing to transmit the data packet in step (2) by the exponential backoff multiple access method in cooperation with network-assisted diversity. The exponential backoff multiple access method provided by the invention is high in throughput, reliability and efficiency, and has excellent burst traffic handling ability.

Description

technical field [0001] The invention relates to a medium access control method in a wireless network, in particular to an exponential backoff multiple access method combined with cooperative network auxiliary diversity. Background technique [0002] At this stage, the continuous informatization of people's work and lifestyle has led to continuous growth in the volume and rate of information communication, especially network communication. In the system of the communication service system, the wireless local area network with multiple access through hotspots will be more widely used. Media Access Control (MAC) technology is the key to the network providing good and fast data services. Media access technologies are usually divided into fixed allocation such as time division multiple access (TDMA), frequency division multiple access (FDMA) and code division multiple access (CDMA), on-demand allocation and random competition such as ALOHA series. The random contention access p...

AI Technical Summary

Problems solved by technology

However, the application of NDMA technology has two important dilemmas: 1) The number of conflicting nodes is generally obtained by estimation, which is error-prone; 2) When the number of conflicting nodes is large, due to channel correlation or quality problems, the situation of dissatisfaction with the rank will be It cannot be parsed correctly, even if the matrix is ​​full rank at this time, the computational complexity is very high

Images