Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: A simplified and unified power save scheme Date Submitted: 1 July, 2002 Source: Knut Odman Company: XtremeSpectrum Inc. Address: 8133 Leesburg Pike, Suite 700, Vienna, VA 22182

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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Project ieee p802 15 working group for wireless personal area networks wpans

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: A simplified and unified power save scheme

Date Submitted: 1 July,2002

Source: Knut Odman

Company: XtremeSpectrum Inc.

Address: 8133 Leesburg Pike, Suite 700, Vienna, VA 22182

Voice: 703-269-3058, FAX: 703-269-3092, E-Mail: [email protected]

Re: Draft P802.15.3/D10

Abstract:This presentation identifies and solves problems with the current handover process.

Purpose:For implementation in standard.

Notice:This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.

Release:The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.


Problem 1 subrate i

Problem 1 – Subrate -I

SF 4

DEV 1 has a sub-rateevery 25000 SF

SF 3

SF 2

SF 1

DEV 2 wants this GTSevery beacon. Is itavailable?

CTR


Problem 1 subrate ii

Problem 1 – Subrate -II

scheduler

GTS2

ATS1

GTS1

GTS

ATS

superframe

Treat sub-rate as hi-priority ATS

Possible but complicated.

Interval not guaranteed.

What is the purpose?


Problem 2 aps

Problem 2 – APS

Not related to transmission needs

No synchronized wakeup. When should it read PCTM?

PNC would have to buffer CTR that may be of no interest once they are allocated.

What is the purpose?


Problem 3 sps i

Problem 3 – SPS -I

GTS1

SF 2

GTS1

SF 1

What does PNC do with a passive GTS?

It cannot reallocate it.


Problem 3 sps ii

SF1

SF5

SF4

SF3

Problem 3 – SPS - II

DEV1

DEV2

DEV4

SF2

How do I broadcast?

How does DEV4 send to DEV1?

How is handover done?


Problem 3 sps iii

Problem 3 – SPS - III

Suspend/ revoke GTS…

Join/leave SPS…

No global sync…

CTRI, SPSI, Active, AWAKE, Sleep…

The complexity is prohibitive

What is the purpose?


Experiences from other protocols

Experiences from other protocols

Other protocols not using PNC forwarding either have announcement beacons where the PNC wakes up dest. DEV,

or announcement slots where the source DEVswake up their destination.

What makes us so special?


Experiences from research

Experiences from research

There is a tradeoff between communication and computation.

If the algorithm is distributed, computation gets smaller but the control overhead increases.

Rule of thumb: Keep it simple.


Qos in the sleep

QoS in the sleep?

Don’t expect QoS to be perfectly maintained in sleep mode.

Responsiveness: Does it matter if you get the slot in 10sor 10.00124s?

Throughput: If you need full QoS, why not wake up,

establish a stream, send data, kill stream and go back to bed?

The overhead isn’t bigger than the current SPS.

Jitter: Can’t be guaranteed anyway.

If it doesn’t happen all the time it’s asynchronous!


Solution i

Solution - I

Remove subrate, APS and SPS from standard.

Introduce PNC regulated wake beacons. The PNChas a down counter to count down to the nextwake beacon. In increased traffic, wake beaconscan come more often.

DEVs join and leave sleep mode. PNC sets bitmapin all beacons.

Use ATS reservation. If dest. in PS, CTA will notcome until next (or a following) wake beacon.


Destination

Destination

Dev2

PNC

asleep

Set Dev2 bit in

beacon PS bitmap

Terminate streamsto and from DEV2


Source

Source

Dev1

PNC

CTR

(DEV2, stream 0)

DEV2 in PS?

true

false

No PCTM needed.The CTA will be therein the wake beacon

Enqueue

(PSQ, data)

Enqueue

(AsynchQ, data)

No isochronous data to PS DEVs


Project ieee p802 15 working group for wireless personal area networks wpans

SF1

SF5

SF4

SF3

Wakebeacon

PNC

CTA1->2

SF2

CTA with Dev2as Destination

PNC can chain more than one wake- beacon after each other if needed


Destination1

Destination

Dev2

PNC

awake

Reset Dev2 bit in

beacon PS bitmap


Beacon elements

octets :1

1

1

0-8

Information IE

length = 1-9

wake-beaconcountdown

PS bitmap

Beacon elements


That s it

That’s it!

Do we really have to make it more complicated than that?


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