1. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 1 SU-MIMO Type for Group Addressed Frames Date: 2011-03-14 Authors:

2. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 2 Abstract The presentation describes means to detect: The BSSID (TA) of the BSS that transmitted the group addressed frame The group address (RA) of the transmitted frame The BSSID and group address detection from the VHT-SIG A enables group addressed receivers to skip the reception of unnecessary group addressed frames and to improve the non-AP STA power efficiency especially in the stand-by mode and in passive scanning. The presentation and normative text in 11-11-314r1 provide solution for CIDs: 124, 665, 666, 667, 669, 973 and 1341.

3. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 3 Recap, Address Indication in PLCP Header 802.11ac is introducing new PLCP header format –The PLCP header indicates the recipient(s) and transmitter 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 group address

4. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 4 Challenges of the Address Indication in PLCP Header Currently PLCP header has partial AID set to 0 for group addressed frames. There is no means to detect: –Transmitter Address (BSSID) –Receiver Address (group address) The current format forces STAs to receive all group addressed PPDUs –Device cannot filter frames from other BSSIDs –Devices cannot filter frames from unnecessary group addresses that it is receiving

5. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 5 Solution, 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 Bit9 set to 1 for individually addressed PPDU, Partial AID in Nsts field Bit9 set to 0 for group addressed PPDU, Group Address Indication in Nsts field

6. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 6 Solution, Group Address Indication Introduce GROUP_ADDR_IND: –TXVECTOR GROUP_ADDR_IND[0:3] = BSSID[0:3] XOR BSSID[4:7] Identification of transmitter address (TA) –TXVECTOR GROUP_ADDR_IND[4:7]= Group Address [0:3] Identification of receiver address (RA) –TXVECTOR GROUP_ADDR_IND[8] = More Data bit Are more group addressed frames transmitted by the transmitter Details of the scheme are described in 11-11-XXXX-00- 00ac-Indication-of-Group-Address.doc

7. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 7 Stand-by Power Consumption In the stand-by the devices receive and transmit very little individually addressed frames The group addressed data generation may be the only received frames in the stand-by –The device cannot control the amount of group addressed frames: Other BSSs may distribute a lot of group addressed frames A STA in BSS may generate and request a lot of group addressed frames transmission The reception of unnecessary group addressed frames increases the stand-by power consumption –The stand-by power consumption defines the battery life time

8. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 8 Filtering of Frames STAs may stop reception of individually addressed frames to PLCP header –The header contains indication of the transmitter and receiver addresses The current 802.11ac PLCP header has no means to specify the group address or transmitter of the PPDU –The transmitter and group address are present in MAC header forcing to receive the whole MPDU FCS at the end of MPDU ensures the correctness of the frame The PLCP header filtering should be used for both the individually and group addressed frames –The same operation simplify the implementation PLCP Synch + HeaderMAC Header Data Payload FCS

9. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 9 Comparing the filtering efficiency The SU-MIMO type for group addressed frames enable big increase to sleep durations. BeaconGroup addressed PPDU TXOP obtaining Operation flow: Time

10. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 10 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: The identifier for the transmitter of the group addressed frame enables filtering group addressed frames to other BSSs The identifier of group address enables to decide which frames to receive Especially the stand-by power consumption is reduced

11. doc.: IEEE 802.11-11/0313r1 Submission March 2011 Jarkko Kneckt, NokiaSlide 11 Pre-motion Do you accept to include the normative text as described in 11-11-0314-00-00ac-SU-MIMO-type-for- group-addressed-frames-text.doc to the spec framework document? Y N A