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In the IEEE 802.16 system, a Relay Station (RS) is required for the purpose of coverage extension and throughput improvement. However, if the authors use the RS, original bandwidth request mechanism is not applied to Subscriber Station (SS) which is connected to RS since the bandwidth request mechanism is optimized for single-hop environment. Therefore, they propose an efficient contention based CDMA bandwidth request mechanism for SS located in RS region in the IEEE 802.16 MMR system. In the proposed scheme, an SS can receive the uplink resource very well wherever an SS is located.
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