132B_1_EE132b_Midterm sol_021306

132B_1_EE132b_Midterm sol_021306 - 1.a Multiplexing Sharing...

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1.a Multiplexing: Sharing communication channel resource among “collocated” stations. Multiple Access Scheme: Sharing communication channel resource among (geographically) “distributed” stations. The key difference is that in multiplexing, there exists a low-delay low-cost mechanism for scheduling, controlling, and coordinating their use of the shared resource, but not in multiple access schemes. In a multiplexing system, the messages issued by the various sessions typically reside in a single common buffer controlled by the multiplexer; in a multiple access system, each station holds its messages in its own buffer. 1.b TDMA – multiple access scheme under which each station is assigned designated time slot(s) per frame on a dedicated basis. DA/TDMA – each station is assigned available slots based on its requests/ reservations. The key difference is that under TDMA, the time slots are assigned on a fixed basis to each station, while for DA/TDMA time slots are allocated on a per-demand basis as availability permits.
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