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IEICE TRANSACTIONS on Communications

Frame Collision Reduction Method Employing Adaptive Transmission Control for IEEE802.11 Wireless LAN System

Akira KISHIDA, Masashi IWABUCHI, Toshiyuki SHINTAKU, Takeshi ONIZAWA, Tetsu SAKATA

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Summary :

The IEEE 802.11 distributed coordinated function (DCF) adopts carrier sense multiple access with collision avoidance (CSMA/CA) as its medium access control (MAC) protocol. In a wireless local area network (WLAN) stations (STAs) congested situation, the performance of the WLAN system is significantly degraded due to a collision between the STAs. In this paper, we propose a simple method that decreases the number of frame collisions. After a successful transmission, the proposed method refrains from transmission during certain time which is defined as post-inter-frame space (Post-IFS). This mechanism improves the system performance including the throughput characteristics and access delay by reducing the number of competing STAs. The length of the Post-IFS is a key factor in improving the system performance for the proposed method. If the access point (AP) can estimate the optimal value of the Post-IFS, collision-free operation similar to that in centralized control is performed. Even if the optimal Post-IFS is not estimated, the number of competing STAs and the collision probability are decreased. Computer simulations verify that the proposed method achieves 40% higher system throughput compared to the conventional CSMA/CA for a network with 50 STAs.

Publication
IEICE TRANSACTIONS on Communications Vol.E97-B No.9 pp.1790-1799
Publication Date
2014/09/01
Publicized
Online ISSN
1745-1345
DOI
10.1587/transcom.E97.B.1790
Type of Manuscript
Special Section PAPER (Special Section on Ambient Intelligence and Sensor Networks)
Category

Authors

Akira KISHIDA
  NTT Corporation
Masashi IWABUCHI
  NTT Corporation
Toshiyuki SHINTAKU
  NTT Corporation
Takeshi ONIZAWA
  NTT Corporation
Tetsu SAKATA
  NTT Corporation

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