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Traffic Model

This paper discusses the necessary traffic data rates for specific use cases, including Smart Grid, Environmental Monitoring, and Indoor Healthcare, focusing on a minimum supported rate of 100 kbps but proposing evaluation parameters for heavy and bursty traffic scenarios. It outlines the possible throughput with a 2 MHz channel bandwidth using BPSK modulation and details the impact of channel contention. The study recommends that 802.11ah should use a data rate of 500 kbps for reliable performance in these critical applications.

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Traffic Model

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  1. Traffic Model Authors: • Date:2011-11-09 Zhong-Yi Jin, Nokia

  2. Introduction • Use cases 1a (Smart Grid), 1c (Environ. Mon) and 1e (Indoor Healthcare) only specify a minimum supported data rate of 100 kbps • In practice, traffic data rate typically varies over time in event driven system • In this contribution, we propose a traffic data rate for heavy/bursty traffics Zhong-Yi Jin, Nokia

  3. High traffic data rate for use cases 1a, 1c and 1e • Max possible throughput with 2Mhz channel bandwith, BPSK ½, 250 byte data • 26 data bits/OFDM Symbol (BPSK 1/2), 40µs symbol duration • SIFS=160µs, PLCP=400µs, MAC-Header=28bytes(344µs), ACK=18bytes (172µs) • Max possible throughput without channel contention overhead: • = 650kbps * Data / {(PLCP + MAC-Header + Data) + SIFS + ACK} • = 478kbps • For evaluation purposes, 802.11ah should consider a data rate of 500kbps for heavy/bursty traffic in use cases 1a, 1c and 1e Zhong-Yi Jin, Nokia

  4. Conclusion • For evaluation purposes, 802.11ah should consider a data rate of 500kbps for heavy/bursty traffic in use cases 1a, 1c and 1e Zhong-Yi Jin, Nokia

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