1. doc.: IEEE 802.15-02/115r1 Submission February 2001 Mark Schrader, Eastman Kodak Co.Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: IEEE802.15.3: Proposed amendments to the TG3-MAC. Date Submitted: 26th February, 2002 Source: Mark E. Schrader Company: Eastman Kodak Co. Address: 1447 Sainte Paul St., Rochester, NY 14653-7023 Voice: +1.585-253-4241, FAX:, E-Mail: mark.e.schrader@kodak.com Re: [ Channel Time Request for ACTIVE mode SPS mode and Streams, CTRB definitions SPS mode timing and definitions. ] Abstract: This presents proposed amendments to the TG3-MAC Purpose: To provide an improvement to the current version of the 802.15.3 MAC 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 these viewgraphs becomes the property of IEEE and may be made publicly available by P802.15

2. doc.: IEEE 802.15-02/115r1 Submission Basic Channel Time Request Differences: ACTIVE and SPS Target DEVID Stream Index CTR Time Unit Minimum CTR Time Units Desired CTR Time Units Bits 88 8 16 88 ACTIVE Channel Time Request Command CTR Interval Target DEVID Stream Index Stream CTR Control CTR Time Unit Minimum CTR Time Units Desired CTR Time Units SPS Slot Fraction SPS Set Index Bits 88 8 881688 SPS Channel Time Request Command Stream CTR Control

3. doc.: IEEE 802.15-02/115r1 Submission Proposed Channel Time Request Command 8 Stream Index 8 Stream CTR Control 8 SPS Set Index 16 CTR Interval 16 CTR Time Unit 8 Desired CTR Time Units 8 Target DEVID 8 Minimum CTR Time Units Time Slot Steam Configuration

4. doc.: IEEE 802.15-02/115r1 Submission Channel Time Request Command Use ACTIVE Channel Time Request Using The Single Command SPS Channel Time Request Using The Single Command 8 Stream Index 88 SPS Set Index (Not Used) 16 CTR Interval 16 CTR Time Unit 8 Desired CTR Time Units 8 Target DEVID 8 Minimum CTR Time Units Stream CTR Control ( CTR Type = 0 ) 8 8 Stream Index 88 SPS Set Index 16 CTR Interval 16 CTR Time Unit 8 Desired CTR Time Units 8 Target DEVID 8 Minimum CTR Time Units Stream CTR Control (CTR Type = 1 ) 8

5. doc.: IEEE 802.15-02/115r1 Submission February 2001 Mark Schrader, Eastman Kodak Co.Slide 5 CTR Interval in SPS and ACTIVE SPS Interval: –One of the parameters specified in an SPS Set. –Specifies number of superframes between Awake beacons –Restricted to be a power of 2. CTR Interval in SPS CTRB –Specifies number of superframes between Slots for an SPS DEV (Awake Slots). –Values restricted to be a power of 2 and greater than or equal to SPS Interval. –Restricted to be a power of 2.

6. doc.: IEEE 802.15-02/115r1 Submission CTR Control Definitions Possible field.

7. doc.: IEEE 802.15-02/115r1 Submission SPS Set Definitions The SPS Interval specifies the number of superframes between Awake beacons. The Next Awake Beacon is the beacon count for the upcoming next beacon to which the SPS DEV will listen.

8. doc.: IEEE 802.15-02/115r1 Submission Slide 8 Proposed Names, Definitions, and Timing Diagrams

9. doc.: IEEE 802.15-02/115r1 Submission Slide 9 New Names and Definitions for SPS mode

10. doc.: IEEE 802.15-02/115r1 Submission Slide 10 SPS Set (formerly EPS Set) –Indexed list of SPS Interval, Next Awake Beacon pairs. Awake Slot –A GTS slot allocated for an SPS DEV. The slot was requested using “SPS” as the CTA Type. –Virtual Awake Slot Indicates that this is the proper place to insert a Awake Slot, but no slot will actually be allocated at this time. SPS Interval –Number of superframes between successive Awake beacons. Awake Slot Interval –Number of superframes between successive Awake slots. Awake Slot Fraction (no longer a specifiable parameter) –The number of SPS Intervals contained in a Awake Slot Interval SPS Sleep Opportunity –Any interval during in which an SPS mode DEV is not required to receive or transmit

11. doc.: IEEE 802.15-02/115r1 Submission Slide 11 Summary of SPS Terms Awake –Awake beacon The beacon in which a DEV in SPS mode DEV is listening. –Awake superframe The superframe associated with a Awake Beacon that may or may not contain an Awake Slot –Next Awake Beacon The beacon number of the next beacon when the SPS DEV will be listening. Sleep –Sleep Beacon Any beacon that is not an SPS DEV’s Awake Beacon –Sleep superframe The superframe associated with a Sleep beacon

12. doc.: IEEE 802.15-02/115r1 Submission Slide 12 The Timing of SPS

13. doc.: IEEE 802.15-02/115r1 Submission Slide 13 Synchronous Power Save Mode SPS Interval CTR Interval For Awake Slot Fraction (WSF) = 1 For WSF = 2 Awake beacon Virtual Awake Slot = No GTS slot is allocated at the time that it would be allocated if WSF=1 CTR Interval Sleep beacon Awake Slot Awake beacon Sleep superframe Awake Slot, normal GTS slot Sleep superframe Awake superframe Sleep superframe Awake superframe SPS Interval Awake superframe

14. doc.: IEEE 802.15-02/115r1 Submission February 2001 Mark Schrader, Eastman Kodak Co.Slide 14

15. doc.: IEEE 802.15-02/115r1 Submission February 2001 Mark Schrader, Eastman Kodak Co.Slide 15

16. doc.: IEEE 802.15-02/115r1 Submission Slide 16 SPS Sleep Opportunities For Awake Slot Fraction = 1 For Awake Slot Fraction = 2 The SPS DEV must Awake up somewhat prior to the Awake beacon or prior to its GTS slot.. Reduced Power Opportunities Key

17. doc.: IEEE 802.15-02/115r1 Submission Slide 17 This means that a counter called the Awake Slot Fraction counter = Awake Slot Fraction. Create Awake Slot. Set Awake Slot Fraction counter to 0. Momentary Awake slot? Awake Slot Fraction? Reset counter for timing the SPS Interval. Increment Awake Slot Fraction counter. SPS Interval? Y Y N N N Switch to SPS Mode (Set a counter called. Awake Slot Fraction counter to 1) PNC’s SPS slot creation logic first cut. Y (Virtual Awake Slot) SPS DEV sent the command called in D09 “Momentary EPS CTA“ to the PNC, prior the Awake superframe. This is counting the number of beacons in the SPS interval. Should the SPS interval synchronize the entry into SPS mode?

18. doc.: IEEE 802.15-02/115r1 Submission Slide 18 Active mode CTR Interval = 2 GTS slot

19. doc.: IEEE 802.15-02/115r1 Submission Slide 19 Changes Needed to Implement The Compromise

20. doc.: IEEE 802.15-02/115r1 Submission Slide 20 Beacon Element to Replace CTA Fields Create new beacon element called “Power Save Information Element”, PSIE. Each information element shall contain, an SPS Set number {1,2,…,N}, a a list of the ADs of DEVs currently in SPS mode, the current value of SPS Interval, and Next Awake Beacon for that SPS set. The PNC shall create a PSIE for each set k only if one or more DEVs currently in SPS mode have CTA’a that were requested with k as the SPS Set. Otherwise the PSIE for k shall not be present in the beacon. Possibility: A PSIE with the SPS Set number of “0” shall be used to allow APS devices to indicate that they are sleeping. The indication is requested using the “Show Mode” field of the APS sleep command when switching into APS sleep mode. Use of set ”0” shall be optional, allowing DEV’s to sleep anonymously if desired. (Diagram of structure see next page)

21. doc.: IEEE 802.15-02/115r1 Submission February 2001 Mark Schrader, Eastman Kodak Co.Slide 21 SPS Information Element SPS Set

22. doc.: IEEE 802.15-02/115r1 Submission February 2001 Mark Schrader, Eastman Kodak Co.Slide 22 Command Changes Combine the two commands to switch PS modes and the one command to insert an SPS slot, to one command that will perform all three functions. (details to follow)

23. doc.: IEEE 802.15-02/115r1 Submission Slide 23 Appendix 1 Power Management Architecture Compromise

24. doc.: IEEE 802.15-02/115r1 Submission Slide 24 Compromise CTA elements indicate channel time only and are absent if no channel time in allocated Traffic pending indicator in the beacon. Beacon indication of DEV’s in EPS mode using an EPS set. This is absent for DEVs not in EPS mode. Ability of a DEV to sleep and Awake up as proposed by Raju. A single beacon entry for EPS Next for each EPS Set that is in use.

25. doc.: IEEE 802.15-02/115r1 Submission Slide 25 Compromise Continued For PNC capable DEV’s –Support 1 EPS Set minimum if Des mode bit not set –Support 4 EPS Set minimum if AC powered. –Add “EPS Sets supported” to PNC capabilities table.