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Uplink Multi-User MIMO Protocol Design

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Presentation on theme: "Uplink Multi-User MIMO Protocol Design"— Presentation transcript:

1 Uplink Multi-User MIMO Protocol Design
Month Year doc.: IEEE yy/xxxxr0 March 2015 Uplink Multi-User MIMO Protocol Design Date: Authors: Yongho Seok, NEWRACOM John Doe, Some Company

2 Uplink MU-MIMO Support in High Efficiency (HE) BSS
March 2015 Uplink MU-MIMO Support in High Efficiency (HE) BSS TGax Specification Framework [1] 4. Multi-user (MU) features This section describes MU related features. MU features include UL and DL OFDMA and UL and DL MU-MIMO. Previous contributions [2][3][4] discussed a feasibility and a performance gain of the uplink MU-MIMO This document further discusses the design issues in the uplink MU-MIMO protocol for improving the performance gain Yongho Seok, NEWRACOM

3 Basic Uplink MU-MIMO Protocol
March 2015 Basic Uplink MU-MIMO Protocol HE AP transmits an Uplink MU-MIMO Poll frame to initiate the uplink MU-MIMO PPDUs transmission HE STAs transmit uplink MU-MIMO PPDUs SIFS after receiving the Uplink MU-MIO Poll frame HT AP replies with an Acknowledgement of the received uplink MU-MIMO PPDUs Yongho Seok, NEWRACOM

4 Uplink MU-MIMO Protocol Discussion
March 2015 Uplink MU-MIMO Protocol Discussion Uplink MU-MIMO Poll frame format Non-HT PPDU Pros: Because a legacy STA can set its NAV, a follow-up Uplink MU-MIMO PPDUs can be protected Cons: Limited accuracy in carrier frequency offset (CFO) estimation for CFO pre-compensation of UL transmission relative to the AP HE PPDU Pros: Potentially higher accuracy in frequency offset estimation and CFO pre-compensation for UL transmission Cons: Because a legacy STA can not set its NAV, a follow-up Uplink MU-MIMO PPDUs can not be protected Yongho Seok, NEWRACOM

5 Uplink MU-MIMO Protocol Discussion
March 2015 Uplink MU-MIMO Protocol Discussion Uplink MU-MIMO PPDU TXVECTOR parameter PPDU Duration: Uplink MU-MIMO Poll frame may contain the PPDU Duration of Uplink MU-MIMO PPDUs O1) All Uplink MU-MIMO PPDU transmission duration shall be identical Pros: Failure recovery and acknowledgement can be more simple because there is no protocol uncertainty Cons: Additional padding mechanism is needed O2) All Uplink MU-MIMO PPDU transmission duration can be different within the PPDU Length granted by AP Pros: Padding complexity is reduced Cons: Failure recovery and acknowledgement can be complex because of protocol uncertainty Yongho Seok, NEWRACOM

6 Uplink MU-MIMO Protocol Discussion
March 2015 Uplink MU-MIMO Protocol Discussion Uplink MU-MIMO PPDU TXVECTOR parameter Space Time Stream: Uplink MU-MIMO Poll frame may contain the Space Time Stream for each Uplink MU-MIMO PPDUs O1) The Space Time Stream(s) of uplink MU-MIMO PPDU shall be identical with the individually granted Space Time Stream(s) from AP Pros: High Space Time Stream utilization Cons: Low flexibility on data rate selection of Uplink MU-MIMO PPDU O2) The Space Time Stream(s) of uplink MU-MIMO PPDU can be different if not exceeding the granted Space Time Stream(s) from AP Pros: Flexible data rate selection based on the channel quality Cons: Space Time Streams can be under-utilized Yongho Seok, NEWRACOM

7 Uplink MU-MIMO Protocol Discussion
March 2015 Uplink MU-MIMO Protocol Discussion Uplink MU-MIMO PPDU TXVECTOR parameter Channel Bandwidth : Uplink MU-MIO Poll frame may contain the Channel Bandwidth of Uplink MU-MIMO PPDUs O1) The channel bandwidth of all Uplink MU-MIMO PPDU shall be identical Pros: simplified and optimized PHY design for each bandwidth is possible Cons: Low flexibility on bandwidth selection of Uplink MU-MIMO PPDU O2) The channel bandwidth of all Uplink MU-MIMO PPDU can be different within the Channel Bandwidth granted by AP Pros: Flexible bandwidth selection according to the channel availability Cons: Additional constraints in PHY design (e.g., an identical pilot tone allocation for different bandwidth) Yongho Seok, NEWRACOM

8 Uplink MU-MIMO Protocol Discussion
March 2015 Uplink MU-MIMO Protocol Discussion Block ACK frame format of Uplink MU-MIMO PPDU The amendment shall define a mechanism for multiplexing DL acknowledgments sent in response to UL MU transmissions. [MU Motion #1, January 2015] Non-HT PPDU : Need to broadcast a new Multi-User Block ACK frame to STAs HE PPDU : DL MU-MIMO or DL OFDMA can be used for multiplexing DL acknowledgments Yongho Seok, NEWRACOM

9 March 2015 Conclusion In order to fully utilize the uplink MU-OFDM technical advantage, the resource assignment (time, space time stream and bandwidth) protocol should be designed with an optimized but minimized implementation complexity Yongho Seok, NEWRACOM

10 March 2015 References [1] [2] [3] [4] Yongho Seok, NEWRACOM

11 Straw Poll #1 Do you agree to add the TGax Specification Framework:
March 2015 Straw Poll #1 Do you agree to add the TGax Specification Framework: 4.x Uplink Multi-user (MU) MIMO frame exchange sequence HE AP transmits a trigger frame (the detailed frame format is TBD) to initiate one or more uplink MU-MIMO PPDUs transmission One or more uplink MU-MIMO PPDUs are transmitted after a SIFS once receiving the trigger frame Yongho Seok, NEWRACOM

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