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Channel allocation problem: static channel allocation, frequency division multiplexing - FDM - bandwidth of channel is divided into N equal sized portions, time division multiplexing - each user is statically allocated every Nth time slot, both techniques are very inefficient for environments with variable number of users and bursty traffic. Multiple Access Protocols: pure ALOHA, nodes can transmit frames at any instance of time, collisions are allowed - contention system, uniform frame size for all nodes.

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