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Frame Synchronization for Mobile WiMAX Femtocells Using IEEE802.11 Based Wireless Backhaul  

Choi, Ji-Hoon (한국항공대학교 항공전자및정보통신공학부)
Oh, Hyuk-Jun (광운대학교 전자통신공학과)
Yun, Jae-Yeun (SK텔레콤 Network기술원)
Ko, Hyun-Mo (SK텔레콤 Network기술원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.8C, 2010 , pp. 667-679 More about this Journal
Abstract
The use of femtocells in buildings and homes has been widely studied as a means to enlarge the cell coverage and increase the network capacity of mobile communication systems. Femtocells for Mobile WiMAX (M-WiMAX) using time division duplexing (TDD) requires frame synchronization with neighboring base stations to avoid interference between uplink and downlink signals. In this paper, we propose a new frame synchronization method for femtocell using IEEE 802.11 based wireless backhaul, which transfers the time information of mobile network to femtocells via the beacon signal provided by IEEE 802.11. Also, in order to reduce timing error of the proposed method, we modify the collision avoidance scheme in the transmitter of IEEE 802.11 and apply a timing estimation technique designed in the sense of least squares to the receiver of IEEE 802.11. Through computer simulations using the proposed scheme, we evaluate the performance of frame synchronization for femtocells and show that the recovered timing information satisfies the timing specification defined by M-WiMAX standard.
Keywords
Femtocell; Mobile WiMAX; Frame Synchronization; Wireless Backhaul; IEEE 802.11;
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