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Indication of Group Address in PLCP Header

Indication of Group Address in PLCP Header. Authors:. Date: 2011-01-17. Abstract. The presentation describes means to provide the group address information in PLCP header. The provided group address information is compatible to Flexible Multicast Service (FMS) as defined in 802.11v D15.0.

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Indication of Group Address in PLCP Header

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  1. Indication of Group Address in PLCP Header Authors: Date: 2011-01-17 Jarkko Kneckt, Nokia

  2. Abstract The presentation describes means to provide the group address information in PLCP header. The provided group address information is compatible to Flexible Multicast Service (FMS) as defined in 802.11v D15.0. Jarkko Kneckt, Nokia

  3. Address Indication in PLCP Header • 802.11ac is introducing new PLCP header format • The PLCP header indicates the recipient(s) of the PPDU • Currently the PLCP header indicates: • Individually addressed PPDU to single user (SU) • The AID defines the recipient • Individually addressed aggregated PPDU (A-PPDU) to multiple users (MU) • The Group ID defines the recipients • Group addressed PPDU • The AID set to 0 indicates any frame type (MSDU or MMPDU) and any group address Jarkko Kneckt, Nokia

  4. Targets of the Address Indication in PLCP Header • The PLCP header should indicate the recipient of the PPDU • The transmission reliability is improved • Enable to avoid reception of unnecessary PPDU • Skipping the reception of unnecessary PPDU reduces power consumption Jarkko Kneckt, Nokia

  5. Challenges of the Address Indication in PLCP Header • The current PLCP header has no means to indicate the type or the group address of the PPDU • Associated STAs receive all group addressed PPDUs • The stand-by power consumption is increased • Typically at stand-by only the group addressed frames are received • The active operation power consumption is increased due to receiving of the unnecessary group addressed PPDUs • The passive scanning STAs receive all group addressed PPDUs • The same PLCP headers in group addressed Beacon (MMPDU) and data (MSDU) Jarkko Kneckt, Nokia

  6. Flexible Multicast Service • 802.11v defines Flexible Multicast Service (FMS) that maps the group addresses to FMSID • The FMSID indicates the group address of the PPDU that will be transmitted • AP decides the group addresses that are mapped to FMSID • The non-AP STA may request the group addresses that are mapped to FMSID • Traffic from specific FMSID may be transmitted at periodicity of multiple DTIMs • Power saving STAs may avoid waking up and receiving at DTIM beacons that do not transmit traffic from the FMSIDs Jarkko Kneckt, Nokia

  7. Solution • The PLCP header should contain the FMSID • The reception of the unnecessary group addressed frames may be avoided • Flexible mapping of the group addressed frames to specific FMSID(s) offer toolset for APs to decrease delays in group addressed frames delivery • Details of the scheme are described in 11-11-0095-00-00ac-Indication-of-Group-Address.doc Jarkko Kneckt, Nokia

  8. VHT-SIG A field of the PLCP header • Currently VHT-SIG A field is capable to indicate: • 63 MU – MIMO groups • 1 SU – MIMO transmission type • VHT-SIG A field will be capable to indicate: • 62 MU – MIMO groups • 2 SU – MIMO transmission types for individually addressed and group addressed PPDUs Jarkko Kneckt, Nokia

  9. Summary • The improved group addressed PPDUs handling enables: • Better addressing of the transmitted PPDUs • More reliability and better understanding of the transmitted traffic • Lower power consumption: • Especially the stand-by power consumption is reduced • The proposed scheme is fully compatible with Flexible Multicast Service as described in 802.11v Jarkko Kneckt, Nokia

  10. Pre-motion • Include the normative text as described in 11-11-0095-00-00ac-Indication-of-Group-Address.doc to the 11-09-992-18-proposed-specification-framework-for-tgac.doc Jarkko Kneckt, Nokia

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