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STA MU-MIMO Group Management Signaling Design

STA MU-MIMO Group Management Signaling Design. Authors:. Date: 2010-07-13. Abstract. We discuss on methods of MU-MIMO Group ID management and MAC signaling. We also give some options of MAC signaling design and compare properties of each option. Group ID extension [3] (1/4).

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STA MU-MIMO Group Management Signaling Design

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  1. STA MU-MIMO Group Management Signaling Design Authors: Date: 2010-07-13 Daewon Lee, LG Electronics

  2. Abstract We discuss on methods of MU-MIMO Group ID management and MAC signaling. We also give some options of MAC signaling design and compare properties of each option. Daewon Lee, LG Electronics

  3. Group ID extension [3] (1/4) • Extend the Group ID concept in order to support larger number of STAs • Extend PHY Group ID with (logical) MAC Grouping Daewon Lee, LG Electronics

  4. Group ID extension [3] (2/4) MAC Extended Group ID = aaa MAC Extended Group ID = bbb MAC Extended Group ID = ccc • Gives the AP possibility to allocate and manage more combinations of STAs • STA-A, STA-B, etc can correspond to MAC Address, Associated ID, or some other unique identifier • If AP only operates the system with 1 MAC extended Group ID for a given PHY Group ID, then the operation should be equivalent to Group ID proposal in 11-10/0073r3 Group ID = xxx STA A STA B STA C STA D STA A STA E STA F STA G ... STA H STA B STA F STA G Multiple extended Group can be defined as long as relative position for a given STAs is not changed under PHY group ID = x Daewon Lee, LG Electronics

  5. Group ID extension (3/4) • Example operation #1 (essentially Group ID based approach [2]) Daewon Lee, LG Electronics

  6. Group ID extension (4/4) • Example operation #2 (essentially SS Paging ID based approach [1]) Daewon Lee, LG Electronics

  7. MAC Signal Field Design (1/4) • Assuming multiple grouping of STAs for a given single Group ID, multiple methods of MAC signaling is possible • MAC signaling methods can be classified depending on the size of the target entity • Option 1 : Signaling addressing entire (multiple ‘extended’ groups) grouping of STAs for a given Group ID • Option 2 : Signaling addressing a single ‘extended’ group of STAs for a given Group ID • Option 3 : Signaling addressing a single STA Daewon Lee, LG Electronics

  8. MAC Signal Field Design (2/4) • Option 1 : Signaling addressing entire (multiple ‘extended’ groups) grouping of STAs for a given Group ID • Assuming Max 4 STAs per MU-MIMO transmission • Some restrictions of multiple STA signaling for different ‘extended’ group needed (possibly mandated in specification) • Total “1+6*N” bytes of information per signaling Daewon Lee, LG Electronics

  9. MAC Signal Field Design (3/4) • Option 2 : Signaling addressing a single ‘extended’ group of STAs for a given Group ID • Assuming Max 4 STAs per MU-MIMO transmission • Total “6~7” bytes of information per ‘extended’ group signaling • Mechanism to allow multiple Group ID assignments may be needed • e.g. if STA#a (pre) assigned with Group ID #1, receives MAC signaling with Group ID #1 without itself as NOT part of Group ID #1 still needs to retain pre-assignment of Group ID #1 Daewon Lee, LG Electronics

  10. MAC Signal Field Design (4/4) • Option 3 : Signaling addressing a single STA • Flexibility of modifying/changing grouping of a single STA • No restriction of STA grouping necessary in specification (although probably needed in implementation) • 3 Bytes per STAs Daewon Lee, LG Electronics

  11. Examples of Signaling Methods (1/2) • Assuming AP needs to signal 2 groups (GroupID) with 8 extended groups each, with 4 STAs in each extended group. Also assume there is only 8 STA • Option 1 : 2 x ( 1 byte + 8 x 6 byte ) = 98 bytes • Option 3 : 2 x 8 x 3 byte = 48 byte Daewon Lee, LG Electronics

  12. Examples of Signaling Methods (2/2) • Assuming AP needs to signal 4 groups (GroupID) with 6 extended groups each, with 4 STAs in each extended group. Also assume there is only 16 STA • Option 1 : 4 x ( 1 byte + 6 x 6 byte ) = 148 bytes • Option 3 : 2x16x3 byte = 96 bytes (may depend on exact grouping) Daewon Lee, LG Electronics

  13. Observations from examples • If AP needs to signal large amounts of exclusive STA groups (i.e. groups of STA which do not have same STAs in each group) • Option 1 may save signaling overhead • If AP needs to signal (extended) groups of STAs with overlapping STAs in each (extended) groups • Option 3 may save signaling overhead Daewon Lee, LG Electronics

  14. Signaling Flexibility Aspect • Unicast and Broadcast of control elements • in general broadcast information is costly in terms of system throughput since lowest MCS needs to be used • in general it is inefficient to replicate information in unicast • if information element is self-contained so that information for different STAs does not necessary be multiplexed together then it would be possible for a given information element be transmitted in either unicast or broadcast • In general having the possibility of modifying STA grouping per STA in unicast or broadcast been beneficial in terms of flexibility Daewon Lee, LG Electronics

  15. MAC Signal Field Design Observations • General Observation • Single Group ID assignment MAC signaling field seems beneficial • Option 1 requires entire grouping assignment to be signaled when logical grouping of a single STA is needed (potential overhead) • Option 2 requires additional mechanisms or STA behaviors defined in order to efficiently support ‘extended’ groups • Option 3 seems to be most robust in terms of STA group assignment flexibility and overhead • If the specification is to only support 1 method of Group ID assignment, then strongly propose option 3 to be the single candidate • Else the specification should at least support option 3 to be robust, additional signaling mechanisms could be considered further Daewon Lee, LG Electronics

  16. Summary • MU-MIMO support will be the major differentiation between 11ac and 11n. MU-MIMO should be designed to support wide range of scenarios allowing optimization of MU-MIMO performance in different target usage scenarios • It will be important to study further relations between grouping and sounding procedures needed for MU-MIMO transmissions • Allowing AP to manage large pool of potential MU-MIMO capable STAs is needed • Allow preemptive grouping of STA at the AP allows effective grouping management protocol and enhances overall MU-MIMO performance • Propose to strongly consider Group ID extension methods in order to support efficient MU-MIMO operations • Propose to support Group ID assignment signaling method ‘option 3’ in Framework document Daewon Lee, LG Electronics

  17. Strawpoll • Do you support adopting Group ID management MAC signaling field as described in Slide 10 of 11-10-0782r0 and editing the spec framework document, 11-09-0992, accordingly? • Note this does not preclude the possibility of supporting additional Group ID management MAC signaling fields later in the specification.) • Yes • No • Abstain Daewon Lee, LG Electronics

  18. Reference • [1] Lee D.W., et. al., “MU-MIMO STA scheduling strategy and Related PHY signaling,” IEEE 802.11-10/0362r02 • [2] Kim J., et. al., “GroupID Concept for Downlink MU-MIMO Transmission,” IEEE 802.11-10/0073r02. • [3] Lee D.W., et. al., “STA Group Management for MU-MIMO,” IEEE 802.11-10/581r00. Daewon Lee, LG Electronics

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