Slotted ALOHA with poisson traffic

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Slotted ALOHA with poisson traffic

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Slotted ALOHA is a fundamental protocol in the field of network communications, designed to improve the efficiency of shared channel access. When combined with Poisson traffic, it models real-world scenarios where users transmit data at random intervals.

In Slotted ALOHA, time is divided into discrete slots, and users are synchronized to transmit only at the beginning of a slot. This reduces collisions compared to pure ALOHA but still faces efficiency challenges when multiple users contend for the channel.

Poisson traffic introduces randomness in transmission attempts, where the number of active users follows a Poisson distribution. Analyzing this with 8, 16, and 32 users helps understand scalability:

8 Users: At lower user counts, collision probability is minimal, leading to higher throughput. The system operates efficiently with fewer retransmissions. 16 Users: As user count increases, collisions become more frequent, reducing throughput. The system reaches a critical point where retransmissions start affecting performance. 32 Users: With high contention, throughput degrades significantly due to excessive collisions. The protocol may require enhancements like backoff algorithms or dynamic slot allocation to maintain efficiency.

Throughput in Slotted ALOHA peaks at around 37% under ideal conditions, but Poisson traffic and varying user counts highlight practical limitations. The study of these scenarios is crucial for designing robust networks, especially in IoT or satellite communications where user density fluctuates.