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802.11 Plenary HCF Performance Result

802.11 Plenary HCF Performance Result. Authors: Lim Wei Lih, Tan Pek Yew Panasonic Singapore Laboratories Blk 1022 Tai Seng Ave, #04-3530 Tai Seng Ind. Est. Singapore 534415 wllim@psl.com.sg. Date: March 11, 2001. Background & Introduction.

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802.11 Plenary HCF Performance Result

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  1. 802.11 Plenary HCF Performance Result Authors: Lim Wei Lih, Tan Pek Yew Panasonic Singapore Laboratories Blk 1022 Tai Seng Ave, #04-3530 Tai Seng Ind. Est. Singapore 534415 wllim@psl.com.sg Date: March 11, 2001 Wei Lih & Pek Yew, Panasonic Singapore Lab.

  2. Background & Introduction • HCF implementation is base on IEEE 802.11-00/467r2 • Expansion from existing DCF implementation • The following statistics are being measured: • Source • Media Access Delay: The total of queue and contention delays of data packets received by WLAN MAC from higher layer. • Sink • End-to-end Delay: Represents the end to end delay of all the packets received by the wireless LAN MAC of this node and forwarded to the higher layer. This delay includes medium access delay at the source MAC, reception of all the fragments individually, and the transfer of the frame via AP. • Throughput: Number of bits sent to the higher layer Wei Lih & Pek Yew, Panasonic Singapore Lab.

  3. HCF Implementation • Enable EAP/HC uses PIFS/SIFS for contention-free transmission in CP • Enables EAP/HC to use +CF-Poll for arranging contention-free transmissions in CP from wireless ESTAs. • Enable ESTA to response on upon receiving a non fragmented {QOS}Data+{CF-Ack} frame, if • It has not sent a frame within this frame exchange sequence • Having higher or same priority frame in the queue. • Enables wireless ESTAs to use (short) Poll Request for contention-free transmission in CP of data bursts. Wei Lih & Pek Yew, Panasonic Singapore Lab.

  4. Throughput • 5 stations transmitting to AP • Packet Interarrival Time: 0.00645 sec • Packet Size: 1500 bytes, which is 1,860,465 bps per station HCF DCF Wei Lih & Pek Yew, Panasonic Singapore Lab.

  5. End-to-end Delay and Media Access Delay • 5 stations transmitting to AP • Packet Interarrival Time: 0.012, 0.08571 sec • Packet Size: 1500 bytes • Aggregated transmission rate: 5Mbps, 7Mbps Wei Lih & Pek Yew, Panasonic Singapore Lab.

  6. End-to-end Delay • 10 stations transmitting to AP • Packet Interarrival Time: 0.024, 0.01714 sec • Packet Size: 1500 bytes • Aggregated transmission rate: 5Mbps, 7Mbps Wei Lih & Pek Yew, Panasonic Singapore Lab.

  7. End-to-end Delay • 20 stations transmitting to AP • Packet Interarrival Time: 0.048 sec • Packet Size: 1500 bytes • Aggregated transmission rate: 5Mbps Wei Lih & Pek Yew, Panasonic Singapore Lab.

  8. Summary • HCF v.s. DCF • better performance • shorter end-to-end delays variation • favorable for Time sensitive traffic and QOS friendly • HCF v.s. PCF • Simplicity. Rules is much simple • Easier to expand from DCF Wei Lih & Pek Yew, Panasonic Singapore Lab.

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