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Page 2 Lecture Notes in Computer Science 2865 Edited by G. Goos ...

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132 J. Deng, Y.S. Han, and Z.J. HaasMAC−1Contention Resolution­ ½ ­ ½ Æ ½RTS CTS DATAÛ­ ½­ ¾MAC−2Û­ ¾Contention Resolution­ ¾RTS­ ¾CTSÆ ¾DATAMAC−2RÛ­ ¾Æ ¾Contention ResolutionDATA­ ¾ ­ ¾ ­ ¾RTS CTS ¡¡¡ RTS CTSÆ ¾DATAFig. 1. Comparison of MAC-1, MAC-2, and MAC-2RTherefore, the throughput of the MAC-2 scheme isS 2 (r) = δ 2t 2· (1 − r) =kw+2r+ k1−r, (2)where the term 1 − r <strong>in</strong> the first equation represents the portion of the entireavailable bandwidth of the shared channel that is used as the data subchannel.Compar<strong>in</strong>g (1) and (2), we conclude that S 2 (r)

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