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Adaptive Collision Resolution Algorithm for Improving Delay of Services in B-WLL System  

Ahn, Kye-Hyun (전북대학교 컴퓨터공학과, 영상정보신기술연구소)
Park, Byoung-Joo (전북대학교 컴퓨터공학과, 영상정보신기술연구소)
Baek, Seung-Kwon (한국전자통신연구원)
Kim, Eung-Bae (한국전자통신연구원)
Kim, Young-Chon (전북대학교 컴퓨터공학과, 영상정보신기술연구소)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.27, no.1B, 2002 , pp. 42-48 More about this Journal
Abstract
In broadband wireless networks, the effective meeting of the QoS guarantees may strongly depend on the Contention Resolution Algorithm used in the uplink contention period. The time it takes a station to transmit a successful request to the base station, or request delay, must be kept low even during periods of high contention. If a request suffers many collisions, it cannot rely on the preemptive scheduler to receive low access delays. However, the conventional collision resolution algorithm has a problem that all collided stations are treated equally regardless of their delay from previous contention periods. Some requests may have very long request delay caused by continuous collisions. In this paper, we propose an adaptive collision resolution algorithm for fast random access in broadband wireless networks. The design goal is to provide quick access to the request with a high number of collisions. To do this, the proposed algorithm separates the whole contention region into multiple sub regions and permits access through each sub region only to the requests with equal number of collisions. The sub region is adaptively created according to the feedback information of previous random access. By simulation, the proposed algorithm can improve the performance in terms of throughput, random delay and complementary distribution of random delay by its ability to isolate higher priorities from lower ones. We can notice the algorithm provides efficiency and random access delay in random access environment.
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