Access method for long propagation delay wireless signal channel

Abstract

An access method along a wireless channel during the long transmission process, the junction center puts a terminal ID in a VT and a DT request queue according to the VT or the DT sign in the request group and then arranges the slot of the next frame of an upstream channel according to a distribution strategy of the channel capacity, wherein, the residual idle slot is taken as the access slot, each access slot comprises M mini-slot, the access micro-slot aggregation is divided into two common parts, such as VTs reserve and VTs, and DTs which are called as the VT subaggregation and the common subaggregation, the length of the VT subaggregation is based on a periodical dynamic alignment of the predication; the junction station combines the slot arrangement of the next frame into a confirmation group and broadcast to various terminals on a downstream channel; after receiving the confirmation group, the terminal respectively sends the request micro-group and the information group on the access micro-slot and the information slot according to the arrangement of the slot. The present invention has the advantages of the flexibility, the fastness and the high efficiency, and can reduce the packet dropout frequency of the voice and the other real-time business and improve the throughput of the data business.

Description

Long Propagation Delay Wireless Channel Access Method technical field The invention relates to a wireless channel access method supporting voice and data integrated services in a mobile communication system with long propagation time delay. Background technique The channel access method, that is, the multiple access (ie, medium access control, MAC) method is used to solve the problem of how to share channel resources quickly, efficiently, fairly and reliably among multiple nodes or users in the communication system. It directly controls the channel resources The allocation of , has a very important impact on system performance. According to the way of channel allocation, multiple access methods are generally divided into three ways: fixed allocation, random access and on-demand allocation. The multiple access method of fixed allocation generally allocates channel resources to some nodes or all nodes of the shared channel for a long time. The channel throughput is high, b...

AI Technical Summary

Problems solved by technology

The shortcoming of this method is: data business can not reserve time slot, and data grouping can only compete with the request of VTs (also be 1 voice grouping) available time slot jointly, under the situation that data business volume is bigger, can produce too much Transmission conflicts lead to a sharp decline in performance such as voice delay and packet loss rate, and the average message delay of data services is relatively large, so this method can only support low-rate data services; and, use the entire time slot to send access requests The method greatly limits the access efficiency of the system. When the traffic volume is large and there are many requests sent on the channel, the system is very unstable due to too many collisions, and many time slots cannot be used, which is a waste of channel resources.

However, the disadvantages of this method are: the subset of mini-slots is fixed, and cannot be adjusted adaptively with changes in services; and the use of "blocking state" requires a frame interval greater than 1 RTD, which means that voice services and data services that have not been reserved successfully Both need to wait for a longer time before continuing to send requests, resulting in an increase in the packet loss rate of voice services and a decrease in service quality, and an increase in the average packet delay of data services and a decrease in throughput

In conclusion, it can be seen from the above that there is currently no channel access method that is very suitable for long propagation delay wireless channels, can better support voice and data integrated services, and make full use of precious channel resources to make terminals flexible, fast and efficient ground access channel

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