A Fair and Wasteless Channel Assignment Protocol for Optical Dual Bus Networks

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概要

• 論文の詳細を見る

• The Distributed Queue Dual Bus protocol (DQDB) has been adopted as the metropolitan area network (MAN) standard by IEEE 802.6 committee. Recently, the unfairness problem in the DQDB protocol, by which head stations benefit, has been pointed out. Although a fair bandwidth distribution among the stations is obtained by adding the socalled bandwidth balancing mechanism into the DQDB protocol (DQDB/BB), the DQDB/BB protocol leaves a portion of the available bandwidth unused, and it takes a considerable amount of time to converge to fair channel assignment. In this study, to overcome the drawbacks in DQDB and DQDB/BB, we introduce a new media access control protocol which is based on assigning each station a level according to some traffic information such as the queueing length, delay time etc. Only the station with the highest level is allowed to transmit. Through the operation of level assignment or the choice of level function, the transmission can be easily controlled in a distributed manner. This protocol is simple compared with DQDB/BB and can be implemented in the DQDB architecture. The simulation results show that the new protocol obtains not only fair throughput regardless of the distance between the stations, but also fair delay performance. In addition, the new protocol can easily provide preempty priority service through level assignment. The new protocol converges to fair distribution of the channel in the time required for only one or two round-trips. This is very fast compared with the DQDB/BB protocol.

• 社団法人電子情報通信学会の論文
• 1995-04-25

著者

• MIYAZAKI Yasumitsu

  Faculty of Engineering, Nagoya University

• Miyazaki Yasumitsu

  Faculty Of Engineering Nagoya University

• Li S

  Toyohashi Univ. Tech. Toyohashi‐shi Jpn

• Li Shu

  Faculty of Engineering, Toyohashi University of Technology

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