A Novel Interference Avoidance Technique on Mobile Wireless Routers Using IEEE802.11n PSMP

Akira KISHIDA  Takefumi HIRAGURI  Masakatsu OGAWA  Kentaro NISHIMORI  Naoki HONMA  Tetsu SAKATA  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.8   pp.2053-2062
Publication Date: 2010/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2053
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Implementation, Experiments, and Practice for Ad Hoc and Mesh Networks)
IEEE802.11n,  IEEE802.16e,  mutual system interference,  PSMP,  wireless relay,  

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This paper proposes an interference avoidance technique that allows wireless device with similar frequency bands to be operated adjacent to each other for compact mobile wireless routers (MWRs). This MWR implements two devices of Wireless LAN (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX). The MWR connects WLAN terminals to the backbone network by using WiMAX-WLAN relay. Generally, different frequency channels are assigned for the wireless systems assign in order not to interfere among multiple systems. However, mutual system interference is generated if the space between each device is very close and if the frequency using each system is adjacent. To suppress this interference, this paper proposes a novel interference avoidance technique that leverages IEEE802.11n Power Save Multi-Poll (PSMP). First, we clarify the conditions that raise the issues of mutual interference by experiment. Simulations are conducted to show that the proposed scheme outperforms the conventional schemes. Finally, the effectiveness of the proposed scheme is shown by the computer simulation.