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Doc.: IEEE 802.11-11/1229r0 Submission 802.11ah M2M Channel Access Performance Date: 2011-09-19 September 2011 Minyoung Park, Intel Corp.Slide 1 Authors:

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Presentation on theme: "Doc.: IEEE 802.11-11/1229r0 Submission 802.11ah M2M Channel Access Performance Date: 2011-09-19 September 2011 Minyoung Park, Intel Corp.Slide 1 Authors:"— Presentation transcript:

1 doc.: IEEE 802.11-11/1229r0 Submission 802.11ah M2M Channel Access Performance Date: 2011-09-19 September 2011 Minyoung Park, Intel Corp.Slide 1 Authors:

2 doc.: IEEE 802.11-11/1229r0 Submission Abstract This presentation provides simulation results to show existing 802.11 CSMA/CA is sufficient to support machine-to-machine channel access (e.g. sensor use case) in 802.11ah. September 2011 Minyoung Park, Intel Corp.Slide 2

3 doc.: IEEE 802.11-11/1229r0 Submission 802.11ah Sensor Use Case Sensor applications traffic [1] –Data packet size: few hundred bytes –Low duty-cycle: transmits data every few minutes –Number of stations could be as large as 6000 stations September 2011 Minyoung Park, Intel Corp.Slide 3

4 doc.: IEEE 802.11-11/1229r0 Submission Simulation Deployment Setting 6000 machines uniformly distributed within a 1km radius circle around the AP. Each machine selects its MCS based on the received signal strength. –E.g., machines within the inner ring operate at the highest MCS. Outdoor channel model [2]: –Macro deployment path-loss model: PL(d) =8+37.6log10(d) September 2011 Minyoung Park, Intel Corp.Slide 4 (MCS0=6.5Mbps/8) (MCS7= 65Mbps/8)

5 doc.: IEEE 802.11-11/1229r0 Submission Simulation Parameters September 2011 Minyoung Park, Intel Corp.Slide 5 ParameterValue Operating frequency900 MHz Bandwidth2.5 MHz Sensor packet size256 bytes Sensor transmission period 2 minutes Sensor Tx power30 dBm Antenna gain3 dBi Slot time37 µs SIFS128 µs MCS Index ModulationR 2.5MHz (1/8 down-clocking) Data rate (Mb/s) 6.4 us GI 0BPSK1/2 0.8125 1QPSK1/2 1.625 2QPSK3/4 2.4375 316-QAM1/2 3.25 416-QAM3/4 4.875 564-QAM2/3 6.5 664-QAM3/4 7.3125 764-QAM5/6 8.125 Data rates used in the simulation: Data rate for control frames: MCS0 Access delay performance measurement –Total amount of time required from packet generation till successful ACK reception. = (defer + backoff + retransmissions including the final successful packet transmission + SIFS + ACK)

6 doc.: IEEE 802.11-11/1229r0 Submission Simulation Results September 2011 Minyoung Park, Intel Corp.Slide 6 Avg. access delay of all machines: 2092.4 usec Avg. access delay of machines with the highest data rate (8.125Mbps): 1204.7 usec Avg. access delay of machines with the lowest data rate (812.5Kbps): 4799.0 usec Over 95% of users are with less than 5ms delay.  Access delay is not an issue for sensors.

7 doc.: IEEE 802.11-11/1229r0 Submission Conclusion Under reasonable traffic intensity, e.g., transmission of 256 bytes every 2 minutes, access delay is not an issue even with large number (6000) of sensor deployment. September 2011 Minyoung Park, Intel Corp.Slide 7

8 doc.: IEEE 802.11-11/1229r0 Submission References [1] Rolf de Vegt, “Potential Compromise for 802.11ah Use Case Document,” 11-11/457r0. [2] Ron Porat et. al., “TGah channel model – proposed text,” 11- 11/0968r1. September 2011 Minyoung Park, Intel Corp.Slide 8

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