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13.3 cdma2000 AIR INTERFACE 42313.3.4 Medium Access Control (MAC) SublayerThe MAC sublayer’s main function is to manage the mapping and multiplexing ofphysical channels into logical channels [19,20]. The logical channels supported bythe MAC sublayer are:. Common Signaling Channels (csch): f-csch and r-csch. Dedicated Signaling Channels (dsch): f-dsch and r-dsch. Dedicated Traffic Channels (dtch): f-dtch and r-dtch. Packet Data Channels (pdch): f-pdch and r-pdch. Forward Broadcast Traffic Channel (f-btch)At its upper boundary, the MAC sublayer interfaces with the LAC sublayer for signalingtraffic, and with upper layers for voice and data traffic (Fig. 13.3-2).Multiplex and QoS Sublayer. This is the main component of the MAC sublayerand is itself subdivided into three parts (Fig. 13.3-5):1. Common channel multiplex sublayer (CCMS), which handles commonchannelsFigure 13.3-5. Detailed protocol structure for the cdma2000w air interface.

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