Discussion on Rank Adaptation for SU-MIMO Transmission in IEEE 802.11-17/1253
MIMO transmission in IEEE 802.11ay supports up to 8 data streams with a focus on SU-MIMO. The need for efficient rank adaptation procedures and corresponding signaling mechanisms is highlighted. The document addresses rank adaptation procedures, example implementations, challenges faced, and proposed changes to enhance the SU-MIMO approach within the IEEE standard.
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Aug 2017 doc.: IEEE 802.11-17/1253 Discussion on Rank Adaptation Date: 2017-08 Authors: Name Li-Hsiang Sun Affiliations Address Phone email Lihsiang.sun@interdigital.com Hanqing Lou Rui Yang 2 Huntington Quad 4F S, Melveille, NY 11747, USA Oghenekome Oteri InterDigital, Inc. InterDigital, Inc. Submission Slide 1
Aug 2017 doc.: IEEE 802.11-17/1253 Background MIMO transmission is supported in 802.11ay. For SU- MIMO transmissions, up to 8 data streams are supported. Rank adaptation procedure for SU-MIMO transmission should be considered. Corresponding signaling and mechanisms should be designed to enable rank adaptation in an efficient way. InterDigital, Inc. Submission Slide 2
Aug 2017 doc.: IEEE 802.11-17/1253 Example Rank Adaptation Procedure Transmit data using EDMG PPDU to STA2 with Nss=1 EDMG Beam Tracking Request=1 TRN field for multiple tx chains with MIMO BF patterns Based on the FBCK received from the STA2 perform SU- MIMO transmission to STA2 TRN SU-MIMO Data ... STA1 ... ACK FBCK STA2 Feedback transmit chains with high SNRs Transmitted using DMG PPDU, with SISO or MIMO BF beams to STA1 DMG format for setting NAV of legacy unintended STA Receive data with Nss=1 Use TRN field to estimate SNR of each spatial stream InterDigital, Inc. Submission Slide 3
Aug 2017 doc.: IEEE 802.11-17/1253 Problems ? Preamble Packet Type =1 Nss=1 EDMG Beam Tracking Request=1 Data TRN Is that possible to transmit data using a lower rank and perform full rank training using TRN field? A TX sector combination index was signaled in a Grant frame The MIMO channel corresponding to the index does not have full rank, based on the measurement performed in the MIMO phase of BF training Data is transmitted in a lower rank, i.e. NSTS < min(NTX, NRX) Beam tracking initiator wants to check whether channel has changed or all the MIMO sectors are available for transmission Without aggregating a BRP frame, TRN field has to be transmitted with the same number of streams as data NSTS Beam tracking initiator cannot take advantage of increased rank if channel has changed Slide 4 InterDigital, Inc. Submission
Aug 2017 doc.: IEEE 802.11-17/1253 Proposed changes 1. Add a field Number of TRN transmit chains in EDMG Header-A for SC/OFDM PHY SU PPDU Field Number of TRN transmit chains Number of bits 3 Description The value of this field + 1 indicates the number of transmit chains used in the transmission of the TRN field of the PPDU. This field is reserved when the EDMG TRN Length field is 0 InterDigital, Inc. Submission Slide 5
Aug 2017 doc.: IEEE 802.11-17/1253 Straw Poll Do you agree to include the changes described in 11-17- 1254-00-00ay? InterDigital, Inc. Submission Slide 6
