Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
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September 2001 Jay Bain Time Domain, Mark Schrader Eastm an Kodak Slide 1 doc.: IEEE 802.15- 01/429r0 Submiss ion Project: IEEE P802.15 Working Group for Wireless Personal Area Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Networks (WPANs) Submission Title: IEEE802.15.3: Overview of Power Save Proposal. Date Submitted: 19 September, 2001 Source: Jay Bain Company: Time Domain Address: 7057 Old Madison Pike Voice: 256 922 9229 , FAX: 256 922 0853, E-Mail: [email protected] Source: Mark E. Schrader Company: Eastman Kodak Co. Address: 4545 East River Road, Rochester, NY 14650-0898 Voice: 716-781-9561 , FAX: 716-781-9533, E-Mail: [email protected] Abstract: This provides an overview of additional proposals on Power Management for incorporation into the draft 0.8. Text is in 01/430r0 Purpose: To provide information and solicit comments on proposed power management updates 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.
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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: IEEE802.15.3: Overview of Power Save Proposal. Date Submitted: 19 September, 2001 Source: Jay Bain Company: Time Domain Address: 7057 Old Madison Pike - PowerPoint PPT Presentation
Transcript of Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 1
doc.: IEEE 802.15-01/429r0
Submission
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: IEEE802.15.3: Overview of Power Save Proposal.Date Submitted: 19 September, 2001Source: Jay Bain Company: Time DomainAddress: 7057 Old Madison PikeVoice: 256 922 9229 , FAX: 256 922 0853, E-Mail: [email protected] Source: Mark E. Schrader Company: Eastman Kodak Co.Address: 4545 East River Road, Rochester, NY 14650-0898Voice: 716-781-9561 , FAX: 716-781-9533, E-Mail: [email protected]
Abstract: This provides an overview of additional proposals on Power Management for incorporation into the draft 0.8. Text is in 01/430r0
Purpose: To provide information and solicit comments on proposed power management updates
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
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 2
doc.: IEEE 802.15-01/429r0
Submission
Topics of proposal (mostly from 01/425r0 and editor notes in d0.7)
• Wake-on-WPAN – Jay Bain• Unused bits in CTA to indicate mode and next
active SF – Mark Schrader• Null-CTA element – Mark Schrader• Current EPS state in device information
request – John Barr • Definitions of EPS and related terms – Jay
Bain
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 3
doc.: IEEE 802.15-01/429r0
Submission
Wake on WPAN
• Transition from EPS to Active mode in an EPS DEV develops MLME-POWERMGT.indication primitive.
• Structure in place in d0.7, 6.3.1.3.• Add tie between the 7.5.x commands changing
modes or indication of data and the clause 6 primitives. Add this text in clause 8.
• Consider addition of means for enable/disable of the indication as a PIB item.
• Add differentiation of Wake to consider the three CTA characters (awake, EPS, momentary)
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 4
doc.: IEEE 802.15-01/429r0
Submission
Unused CTA Bits
CTA Mode
SST/NAB Switch
August 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 5
doc.: IEEE 802.15-01/429r0
Submission
Outline
• Issues from previous proposal• New CTA bits definitions• Advantages• Impact
August 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 6
doc.: IEEE 802.15-01/429r0
Submission
Issue1
• There is no explicit indication in the CTA element if it is an AWAKE or an EPS type. There is a difference:– If EPS CTA then the DEV will not be awake
for each beacon– If AWAKE CTA then the DEV will be awake
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 7
doc.: IEEE 802.15-01/429r0
Submission
Issue 2
• When a station is sleeping there is no beacon info. communicated about the state of the DEV. Information:– Is it in EPS mode or AWAKE mode?– When will the source be waking up or
simply having its next time (low QoS) slot?• For destination DEVs losing
beacons/synchronization• For a station wanting to establish a stream
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 8
doc.: IEEE 802.15-01/429r0
Submission
Issue 3
• CTA elements are added and omitted from the header depending on whether the DEV has a slot (or will be awake) in that superframe. This may be more work for the PNC then always having the CTA element and modifying the values of CTA fields periodically.
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 9
doc.: IEEE 802.15-01/429r0
Submission
Destination DEV address = 1B
Source DEV address = 1B
Slot Start Time = SST = 2B
Stream ID = 1B
Unused = 1B
Current CTA Element Fields
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 10
doc.: IEEE 802.15-01/429r0
Submission
Proposed Use of Two Unused CTA Bits
• Bit 0: CTA Element Type & DEV Mode• 0 = AWAKE CTA Element Type • 1 = EPS CTA Element Type
• Bit 1: SST/NAB Field Definition• 0 = The field is the Slot Start Time, SST, as in
previous slide and the current draft D07, p78.• 1 = Next Active Beacon, NAB. The field is
defined as, the 2 LSB’s of the beacon number, of the next superframe in which the DEV will have a time slot (or if asleep, wake up).
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 11
doc.: IEEE 802.15-01/429r0
Submission
Result of These Changes• An AWAKE DEV with a time slot every N
superframes will always have a CTA element.
• A device that is asleep (EPS mode) will always have a CTA element.
• Other DEVs reading the a CTA element always know the mode of that DEV, and either the slot time or the beacon number of the next time slot.
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 12
doc.: IEEE 802.15-01/429r0
Submission
What is the Impact?• CTA element values will not change any
more often than before. Important for the “CTA change bit”.
• CTA adds/deletes will occur less often then before.
• The PNC will post the:– CTA mode associated with a CTA element.– next SF in which a slot will occur if it is not in
this SF.
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 13
doc.: IEEE 802.15-01/429r0
Submission
Global Advantages• The mode is always posted.
• Network robustness and synchronization will be improved:– If: – Then: the next beacon will be enough to
restore the lost beacon information regardless of mode or QoS.
• Minimal, if any, additional PNC overhead.
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 14
doc.: IEEE 802.15-01/429r0
Submission
Null CTA Element
September 2001
Jay Bain Time Domain, Mark Schrader Eastman KodakSlide 15
doc.: IEEE 802.15-01/429r0
Submission
Definition
• The null CTA element is a CTA element with the same slot start time as the next CTA element listed in the beacon. It is used to indicate that a sleeping device is awake on this superframe to listen to the beacon, but does not have a time slot allocated.
