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Remaining issues regarding power save

Remaining issues regarding power save. Date: 2007-06-13. Authors:. Abstract. Quick status summary on power save related comments 49 comments are still open. “Topic by topic” discussion is needed to resolve these comments. Suggested topics to be discussed

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Remaining issues regarding power save

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  1. Remaining issues regarding power save Date: 2007-06-13 Authors: Kazuyuki Sakoda

  2. Abstract • Quick status summary on power save related comments • 49 comments are still open. • “Topic by topic” discussion is needed to resolve these comments. • Suggested topics to be discussed • 1) Power save and Routing interaction • 2) How to transmit broadcast/multicast frames • 3) TSPEC in Mesh ? • 4) APSD editorial • 5) Simplify Power Management • 6) Definition of sync mode. • 7) Utilization of ATIM window • 8) More on APSD... • 9) Miscellaneous Kazuyuki Sakoda

  3. 1) Power save and Routing interaction • Affected CIDs • 180, 5679, 1500, 3537, 3944, 492, (705, 1857) • Summary of these comments • Explicitly address the issue of the effect of power management mode on route stability. • Consider the sub-modes on power save (route discovery active or not). • Need to define a new message to carry the power save mode information. • Clarify Power save related “capability bit”. • If it is certain that specific multicast addresses are not intended for PS MP's, the implementor should have the option to turn off buffering for this traffic. • (Make PS support mandatory.) Kazuyuki Sakoda

  4. 2) How to transmit broadcast/multicast frames • Affected CIDs • 4263, 781, 108, (782, 1895, 2230, 3440, 4647) • Summary of these comments • The main issue with the IBSS power-saving is that knowledge of the power-saving state of your peers is imprecise, based in receiving broadcast information... This causes my knowledge of the receiver's power-saving state to be the wrong one. Suggest not to use broadcast ATIM frames. • Suggest replacing broadcast notification with a unicast notify/acknowledgement to increase reliability and convergence time. • What is " short broadcast or multicast frame" ? Only short broadcast frames are allowed to transmit during ATM window of sync MPs. • (MIB attribute “dot11shortMulticastFrameLengthLimit” is missing.) Kazuyuki Sakoda

  5. 3) TSPEC in Mesh ? • Affected CIDs • 4261, 1093, 4450, 1090, 1100, 3951 • Summary of these comments • TSPEC is only defined for use between a STA and its AP. • Description on TS operation is completely missing. • Should the MP provide an admissions control guarantee, similar to the guarantee made by an AP to a STA for a traffic stream or access category, or is the purpose of a TSPEC limited to establishing state used in PS operations? • Since its unclear how TS are suspended, the section on TS reinstatement is unnecessary. Kazuyuki Sakoda

  6. 4) APSD editorial • Affected CIDs • 563, 565, 783 • Summary of these comments • Periodic APSD vs Scheduled APSDAperiodic APSD vs unscheduled APSD • How does an MP determine if neighbors in a mesh support scheduled and unscheduled APSD? • Another issue • QSE(WMM) SG is going to amend the base standard regarding 11e.QSE(WMM) SG is likely to amend some part of APSD.Should we add detailed description on APSD as a part of 11s, or should we point the APSD part of the base standard ? Kazuyuki Sakoda

  7. 5) Simplify Power Management • Affected CIDs • 567, 4264, • Summary of these comments • The section on power management needs simplification as it is confusing. • I predict it will *never* interoperate reliably.Please, please, please simplify. Kazuyuki Sakoda

  8. 6) Definition of Sync Mode • Affected CIDs • 683, 5681, 3927, 3928, 4451, 1501 • Summary of these comments • What is an unsynchronizing MP? • Please define unsynchronizing MP without ambiguity. If necessary, please modify the corresponding sections. Sync discussion is ongoing, in parallel. Define “independent sync” and “Mesh sync” ? • What happens if the MP finds multiple MP as neighbors which maintains different mesh TSF, DTIM interval, or ATIM window ? • All sync MPs adopt the same parameters, which may not be true in a heterogeneous network. •  Is global parameter adoption a good approach for mesh ? Kazuyuki Sakoda

  9. 7) Utilization of ATIM window • Affected CIDs • 4262, 1994, 5665, • Summary of these comments • The ATIM window is going to be awfully busy. • Any short frame should be able to send during the ATIM period. • Each unsynchronizing MP has its own ATIM window, and it does not need to wake up until the ATIM window expiration. Kazuyuki Sakoda

  10. 8) More on APSD ... • Affected CIDs • 564, 1995, 2001, 566, • Summary of these comments • Include text to explain how MDA and Scheduled APSD will be used together. • Describe mechanisms for PS_poll or U-APSD triggering mechanism. • Unscheduled APSD is not that useful for mesh [as is also indicated in the draft] and therefore it should not be mentioned in the draft. Kazuyuki Sakoda

  11. 9) Miscellaneous • CID1998 • The node shall be able to return to PS, if the transmitted frames are not received by the receiver. • CID2002 • The MP should be able to return to sleep as soon as possible.Replace the last word in line 7 page 199 to: "earlier". • CID4452 • Modify the sentect to "A mesh point that transitions to the wake state and sucessfully transmitts a beacon should remain awake for the remainder of the beacon interval after the ATIM window.“ • CID1479 • Obviously, a mesh point must transition to awake if it has traffic to transmit.Replace "may" with "must“. • CID3571, 3947 • All broadcast traffic are sent in DTIM interval. This means that a lot of the mesh messaging will be concentrated in this period. This may create unacceptable collision which may destroy the mesh. Kazuyuki Sakoda

  12. 9) Miscellaneous (Cont’d) • CID4265 • The way to specify default values for parameters is in the MIB, not informative text. • CID3572 • Explain the rationale for selecting these values. Kazuyuki Sakoda

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