Randow access scheme for communication system

Abstract

This invention discloses a random access method, in which access point AP can dynamically adjust the number of random access channels of the next frame according to the condition of network load reflected by the access channels and broadcast through downlink public control channels. When the request for the occurrence of group collision needs repeated access mobile terminal MT, utilizing binary index retreat algorithm, dynamically expends size of competition window, and according to down public control channel published random access channel number, successful access request number and MT service access priority level, real-time refreshes sending probability to reduce repeated collision probability. At circumstance of low or high network load, the invention can increase random access probability of success, and reduce access time delay, and provide better service Qos for high-level user.

Description

technical field [0001] The present invention relates to a new random access method. Background technique [0002] With the continuous expansion and development of mobile service applications, the next generation of wireless cellular communication will be a mixed transmission of voice, data, video and other services with different performance parameters. As an important part of the network protocol, the random access protocol has always been a research hotspot. In particular, it is hoped that a simple and efficient random access technology can be adopted to meet people's needs for information access, computing and communication anytime and anywhere. [0003] At present, many protocols have been proposed to solve the problems in the random access process, including protocols based on slotted ALOHA, protocols based on resource reservation, and protocols based on dynamically configuring random access channel resources. In many existing access systems, the simple and efficient a...

AI Technical Summary

Problems solved by technology

In many existing access systems, the simple and efficient access scheme of time-slotted ALOHA is often used. However, when the network throughput is large, the delay changes greatly and the performance is not good.

Considering the network status, the proposed dynamic access scheme adjusts the network parameters according to the network load, which greatly improves the utilization of the network. However, these schemes lack effective support for different levels of access services. When a collision occurs and retransmission needs to be backed off, MTs with different business requirements use the same transmission mode, without considering the access requests of higher-priority services, which cannot better guarantee the QoS requirements of real-time services, nor can it meet today's high-speed Requirements for the burstiness of a large number of access requests in an all-packet network

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