Enhancing CTS_DTS Control Trailer for SU-MIMO Channel Access
Explore the need to improve the current CTS_DTS control trailer in IEEE 802.11 standards for SU-MIMO channel access. The existing trailer lacks essential configuration signaling, hindering efficient transmission setups. The proposal suggests adding a field to convey TX sector combination and RX AWVs for effective SU-MIMO transmissions. Dive into the details of this solution for optimized channel access in wireless communications.
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March 2018 doc.: IEEE 802.11-18/0501r0 CTS_DTS Control Trailer for SU-MIMO Channel Access Date: 2018-03-03 Authors: Name Kome Oteri Affiliations Address 9710 Scranton Road, # 250 San Diego, CA, 92127 Phone +1 858.210.4826 email Kome.oteri@interdigit al.com InterDigital, Inc. Rui Yang Carlos Corderio Intel InterDigital Submission Slide 1
March 2018 doc.: IEEE 802.11-18/0501r0 Introduction The current specification for the RTS/CTS method for SU-MIMO channel access (10.36.11.4.3 procedure), allows the recipient EDMG STA to set up an SU- MIMO configuration with the DMG CTS field using a control trailer. However, the current CTS_DTS control trailer does not support signaling the configuration needed to the transmitter. We highlight the problem and discuss a suitable solution. SU-MIMO channel access InterDigital Submission Slide 2
March 2018 doc.: IEEE 802.11-18/0501r0 Current Specification If an EDMG STA that receives an RTS frame with a control trailer indicating a SU-MIMO transmission or hybrid beamforming to itself is able to perform the SU-MIMO receiving, it shall configure its DMG antennas according to the settings included in the control trailer of the received RTS frame. It shall also transmit a DMG CTS frame with a control trailer in response of the received RTS frame. For this transmitted DMG CTS frame, the TXVECTOR parameter SCRAMBLER_INIT_SETTING shall be set to CONTROL_TRAILER and the parameter CT_TYPE shall be set to CTS_DTS. If it uses SU-MIMO for the transmission in the reverse direction, the SISO/MIMO field shall be set to 1 and the SU/MU MIMO field shall be set to 0. The DMG CTS frame should be transmitted using all SU-MIMO sectors, with a small delay between each sector. The control trailer also indicates the corresponding DMG antenna configuration for the upcoming SU-MIMO transmission in the reverse direction. InterDigital Submission Slide 3
March 2018 doc.: IEEE 802.11-18/0501r0 Current CT_Type is CTS_DTS InterDigital Submission Slide 4
March 2018 doc.: IEEE 802.11-18/0501r0 CT_Type is GRANT_RTS_CTS2Self InterDigital Submission Slide 5
March 2018 doc.: IEEE 802.11-18/0501r0 Updated CTS_DTS CT Field The control trailer also indicates the corresponding DMG antenna configuration for the upcoming SU-MIMO transmission in the reverse direction : The current CT for CTS_DTS does not contain any configuration information. Solution: Add field similar to TX Sector Combination Index found in the GRANT_RTS_CTS2Self control trailer to the CTS_DTS control trailer Indicates the TX sector combination (as defined in 9.4.2.253) and the corresponding RX AWVs to be used in the SU-MIMO transmission from the EDMG STA transmitting the DMG CTS to the EDMG STA that transmitted the RTS. Reserved if the SISO/MIMO field is set to 0 or the SU/MU MIMO field is set to 1 or the CT is sent with a DMG DTS frame. TX Sector Combination Index 6 xx InterDigital Submission Slide 6
March 2018 doc.: IEEE 802.11-18/0501r0 Additional Issues If it uses SU-MIMO for the transmission in the reverse direction : Use of the term ReverseDirection may be problematic e.g. may be confused with Reverse Direction Protocol Change reverse direction as the OPPOSITE direction and define this explicitly If it uses SU-MIMO for the transmission in the reverse opposite direction, i.e. from the EDMG STA that received the Grant frame to the EDMG STA that transmitted the Grant frame, If it uses SU-MIMO for the transmission in the reverse opposite direction, i.e. from the EDMG STA that received the RTS frame to the EDMG STA that transmitted the RTS frame, InterDigital Submission Slide 7
March 2018 doc.: IEEE 802.11-18/0501r0 Conclusion In this contribution, we have discussed some issues with the current RTS CTS procedure in 10.36.11.4.3 (SU-MIMO channel access procedure) in D1.0 and presented a solution. We have also presented a modification to the term reverse direction due to a possible confusion with the Reverse Direction Protocol. InterDigital Submission Slide 8
March 2018 doc.: IEEE 802.11-18/0501r0 References 1. IEEE P802.11ay /D1.0 InterDigital Submission Slide 9
March 2018 doc.: IEEE 802.11-18/0501r0 Straw Poll 1 Do you agree to the following? Do you agree to the Draft Text in 11-18/0502r0 Y/N/A InterDigital Submission Slide 10
