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Doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 1 Mechanisms for.

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Presentation on theme: "Doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 1 Mechanisms for."— Presentation transcript:

1 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 1 Mechanisms for Transmission Suppression in 802.11 Author: Matthew Sherman AT&T Labs - Research 180 Park Avenue Florham Park, NJ 07932 973-236-6791 mjsherman@att.com Date: Jan 18, 2001

2 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 2 Problem addressed 802.11e is developing mechanisms to support QoS Many situations when the ability to cause groups of STA to cease transmissions would be useful –Accommodate TBTT for Beacon transmission –Overlapped BSS Mitigation –Accommodate protocol enhancements HCF / Token passing schemes, Other Would like technique applied to also work with Legacy STA (LSTA) Would like ability to differentiate between Legacy and groups of 802.11e STA (ESTA)

3 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 3 Approach to Problem Develop method to Set NAV in a STA group Develop method to Reset NAV in a STA group Use existing frame formats as much as possible –Enhances compatibility with LSTA

4 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 4 Approach to Problem (Cont.) Played with interpretation of RTS, CTS, and CF-End messages Had ESTA use Addresses for qualifiers and signaling –Apply Duration field based on contents of Addresses Based signaling / qualifiers on Address types –Unicast –Multicast –Broadcast Chose mappings that are consistent with current usage of address fields in standard

5 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 5 Suggested ECTS Mechanisms Enhance CTS (ECTS) usage to allow setting Duration/ID field to any valid Duration value –Broadens context for Duration field use Enhance CTS usage to allow any valid address in RA field LSTA will always set NAV for duration indicated Rules for ESTA will vary (See Chart) Allow use of PIFS with this message for preferential media access (EAP only)

6 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 6 Map of New Capabilities (CTS) MessageRAEffect (LSTA always set NAV) CTSUnicastSet NAV CTSMulticastSet NAV if in Group CTSBroadcastSet NAV if legacy

7 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 7 Suggested ERTS Mechanisms Enhance RTS (ERTS) usage to allow setting Duration/ID field to any valid Duration –Broadens context for Duration field use Enhance RTS usage to allow any valid address in RA and TA fields LSTA will always set NAV for duration indicated Rules for ESTA will vary (See Chart) Allow use of PIFS with this message for preferential media access (EAP only)

8 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 8 Map of New Capabilities (RTS) MessageTARAEffect on ESTA (LSTA always set NAV) RTSunicast1 Set NAV if in same BSS RTSunicast1unicast2Set NAV, Respond CTS, Obey NAV for CTS RTSunicast1multicast1Set NAV if not in Group RTSunicast1broadcastSet NAV RTSmulticast1unicast1Set NAV if Group, send CTS to Group, ignore NAV for CTS, obey physical CCA RTSmulticast1 Set NAV if Group, send CTS to Group, ignore NAV for CTS, obey physical CCA RTSmulticast1multicast2Set NAV if Group1, send CTS to Group1, ignore NAV for CTS, obey physical CCA RTSmultcast1broadcastSet NAV RTSBroadcastunicast1Set NAV if not in same BSS RTSBroadcastmulticast1Set NAV if not in same group RTSBroadcastbroadcastSet NAV

9 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 9 Suggested ECF-End Mechanisms Enhance CF-End (ECF-End) usage to allow any valid address in RA and TA fields Allow use of ECF-End outside CFP LSTA always reset NAV when received Rules for ESTA will vary (See Chart) Allow use of PIFS with this message for preferential media access (EAP only) Could also use “piggybacked” Ack

10 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 10 Map of New Capabilities (CF-End) MessageTARAEffect on ESTA (LSTA always reset NAV) CF-Endunicast1 Reset NAV if in same BSS CF-Endunicast1unicast2Reset NAV if unicast2 CF-Endunicast1multicast1Reset NAV if in Group CF-Endunicast1BroadcastReset NAV CF-Endmulticast1unicast1Reset NAV if Group CF-Endmulticast1 Reset NAV if Group CF-Endmulticast1multicast2Reset NAV if Group2 CF-Endmultcast1broadcastReset NAV CF-EndBroadcastunicast1Reset NAV if not in same BSS CF-EndBroadcastmulticast1Reset NAV if not in same group CF-EndBroadcastbroadcastReset NAV

11 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 11 What Enhancements Accomplish If no LSTA –Can set / reset NAV independently in any group of ESTA –Some ability to control remote groups via RTS/CTS relay –Since can have “Group” of one, can set for single ESTA as well If LSTA are present –Must treat as special case –Sometimes part of addressed group, Sometimes not

12 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 12 A Special Case May want to set NAV in ESTA Group but not LSTA Use 2 message sequence Send ECTS to Group –Group sets NAV –LSTA set NAV Send ECF-End from broadcast –LSTA reset NAV –No ESTA reset NAV

13 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 13 Comments on Mechanisms No new frame formats required Fully backward-compatible Tables presented are suggestions –Meant to show concept –Open to other usage mappings –Open to partial acceptance of mappings Implementation of mechanisms could be optional –Some mapping mandatory in ESTA to be of use Duration field in other frame types could also be used to reserve channel –RTS/CTS seemed most appropriate

14 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 14 Comments specific to Overlapped BSS Goal of new mappings is to allow suppression of groups of terminals in overlap Technique assumes ability exists to assign terminals to groups –Where is such a technique defined? –Are modifications required to support it? Best if applied with ability to solicit interference info from STA –Which other STA are heard at what power level –What Management frame should be used for report? –Are new elements needed?

15 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 15 Other Mechanisms for Consideration Allow side-traffic during CFP –Allows relay of “Proxy Beacon” and other messages when Disjoint CFPs exist between adjacent BSSs Define ability of STA to relay messages –Already need for Proxy Beacon Allow non-uniform Fragmentation during CFP –More efficient use of TxOPs

16 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 16 Example Applications of New Mechanisms

17 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 17 B B ECTS Beacon Example ECTS Usage Reduction of TBTT Overrun* Tx2 TBTT TxN PIFS TBTT Tx1 NAV Set by Legacy STA Legacy Tx Suppressed ETx RA=Broadcast * Assumes ESTA knows not to overrun TBTT ETx is transmission by ESTA

18 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 18 ERTS Example ERTS Usage* Unscheduled CFP Prior Tx PIFS NAV Set by all STA Unsolicited Tx Suppressed CF_PollCF_End NAV Reset by all STA CF_Ack Unscheduled CFP shortened by CF-End * HFC may be better option. This is just a convenient example. Also shows use of CF_END to reset NAV and shorten Tx Suppression time TA=Don’t Care RA=Broadcast

19 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 19 ECTS Example Usage Hidden STA Suppression* RA=Group A * Assumes Hidden ESTA (HSTA) is in known group to begin with (Group A) Assume group same as for Relay ESTA (RSTA) ERTSB Beacon TBTT TA=Group A RA=RSTA Hidden Node Suppressed CF_Poll CFP

20 doc.: IEEE 802.11-01/097 Mechanisms for Transmission Suppression in 802.11 January 18, 2001 Matthew Sherman, AT&T Labs - ResearchSlide 20 Example Usage - BSS Silent* BSS2 BSS1 * Assume ESTA that interfere from BSS2 to BSS1 are in group A Assume ESTA that interfere from BSS1 to BSS2 are in group B ECTSTx RA=Group A ERTS TA=Don’t Care RA=Broadcast Tx BSS2 Silent Unscheduled CFP CF-PollCF-End ECTS ERTS RA=Group B TA=Don’t Care RA=Broadcast Unscheduled CFP CF-PollCF-End Tx BSS1 Silent CF-End

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