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Sensors 2011, 11(10), 9700-9716; doi:10.3390/s111009700

Coexistence of WiFi and WiMAX Systems Based on PS-Request Protocols

1,* , 2
Received: 28 August 2011 / Revised: 28 September 2011 / Accepted: 9 October 2011 / Published: 13 October 2011
(This article belongs to the Special Issue Selected Papers from FGIT 2010)
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We introduce both the coexistence zone within the WiMAX frame structure and a PS-Request protocol for the coexistence of WiFi and WiMAX systems sharing a frequency band. Because we know that the PS-Request protocol has drawbacks, we propose a revised PS-Request protocol to improve the performance. Two PS-Request protocols are based on the time division operation (TDO) of WiFi system and WiMAX system to avoid the mutual interference, and use the vestigial power management (PwrMgt) bit within the Frame Control field of the frames transmitted by a WiFi AP. The performance of the revised PS-Request protocol is evaluated by computer simulation, and compared to those of the cases without a coexistence protocol and to the original PS-Request protocol.
Keywords: coexistence; mutual interference; power saving mode; PS-Request; duration field coexistence; mutual interference; power saving mode; PS-Request; duration field
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kim, J.; Park, S.; Rhee, S.H.; Choi, Y.-H.; Chung, Y.-U.; Hwang, H.Y. Coexistence of WiFi and WiMAX Systems Based on PS-Request Protocols. Sensors 2011, 11, 9700-9716.

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