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Doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 1 Power Saving Possibilities for Networks Supporting.

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Presentation on theme: "Doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 1 Power Saving Possibilities for Networks Supporting."— Presentation transcript:

1 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 1 Power Saving Possibilities for Networks Supporting a Large number of STAs Date: 2012-01-09 Authors:

2 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 2 Abstract We consider energy efficiency based on grouping and sleeping modes for the DCF operation in 802.11ah

3 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 3 Motivation Use case 1a Smart Grid - Meter to Pole (6000 STAs per AP) [1] Traffic can be continuous/periodic/bursty Sensors measure power/gas/water DCF performance deteriorates when a large number of STAs contend for medium [2] –Overall number of MAC retries and total transmission delay grow exponentially with the number of STAs Grouping based on contention factor was proposed in [3] –AP sends in Beacon contention factor Q in [0,1] and time interval T

4 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 4 Motivation

5 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 5 Sleep modes when inactive Existing standard allows a STA to sleep when its buffer is empty When a large number of STAs contend for the medium –A large proportion stays idle waiting for medium access –Buffers may be non-empty Can we enable additional sleep modes to save energy under non-empty buffers?

6 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 6 Our proposal

7 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 7 Simulations 100 STAs associated with an AP STAs are uniformly distributed within a 1km radius Traffic model –1 packet/s –Packets consist of 256 bytes Slot = 37 microseconds SIFS = 126 microseconds Contention window takes values in [15 - 1023]

8 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 8 Simulation Scenarios 1 group or 3 groups (randomly created) Scenarios 1.Three groups (1.0/0.0/0.0) no sleep simultaneous start Only STAs in a single group can contend DCF is used for the STAs that pass the “contention test” If they have traffic, contend simultaneously STAs that fail the test go to sleep Group schedules alternate with time (short beacons can be used) 2.Three groups (1.0/0.0/0.0) sleep randomized start DCF with randomization –Uniform in Beacon interval STAs listen Beacons, sleep, wake up to transmit and sleep 3.1 group (1.0) no sleep simultaneous start (DCF like operation) 4.1 group (1.0) sleep randomized start (DCF with sleep option)

9 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 9 Energy CDF for Different Methods DCF has the worst performance Grouping reduces the energy consumption

10 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 10 Energy CDF for Different Methods DCF has the worst performance Grouping reduces the energy consumption Previous figure zoomed

11 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 11 Delay CDF for Different Methods Pure DCF has the worst performance Grouping improves delay

12 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 12 Delay CDF for Different Methods Pure DCF has the worst performance Grouping improves delay Previous figure zoomed

13 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 13 Conclusions Energy is one of the most important resource in sensor applications Grouping with the additional sleeping capability improves both energy and delay under DCF operation

14 doc.: IEEE 802.11-12/0028r1 Submission January 2012 Anna Pantelidou, Renesas Mobile CorporationSlide 14 References [1] 11-11-0457-00-00ah-potential-compromise-of-802- 11ah-use-case-document [2] 11-11-1019-01-00ah-simulation-large-number-of- stas-support [3] 11-11-1255-00-00ah-dcf-enhancements-for-large- number-of-stas

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