Doc.: IEEE 11-14/1381r1 Submission Novel RTS/CTS Procedure October 2014 B. Zhao and K. Yunoki, KDDI R&D LabsSlide 1 Date: 2014-10-30 Authors:

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doc.: IEEE 11-14/1381r1 Submission Novel RTS/CTS Procedure October 2014 B. Zhao and K. Yunoki, KDDI R&D LabsSlide 1 Date: Authors:

doc.: IEEE 11-14/1381r1 Submission Abstract This document proposes a novel RTS/CTS procedure to alleviate the exposed terminal issue while handling the hidden terminal issue. –Measurement in a dense area show that RTS/CTS can achieve higher throughput in weak signal case. [1] However, the achieved gain was very small. –The proposed scheme is expected to achieve higher throughput while using RTS/CTS. (TGax R1[2]) October 2014 B. Zhao and K. Yunoki, KDDI R&D LabsSlide 2

doc.: IEEE 11-14/1381r1 Submission Description of the proposed scheme RTS CTS Src Dst B. Zhao and K. Yunoki, KDDI R&D Labs October 2014 Data Node_1 Node_2 Src and Dst exchange RTS/CTS frame before Src sends data frames to Dst. Node_1 can hear RTS from Src but can’t hear CTS from Dst. Node_2 can hear CTS from Dst but can’t hear RTS from Src. Node_1 & 2 have to decline their transmissions during NAV set by RTS/CTS. However, transmission from Node_1 might not affect reception on Dst. Because Node_1 is located outside of the range of Dst. 3

doc.: IEEE 11-14/1381r1 Submission RTS1 DATA1 ACK1 S1 (Src) D1 (Dst) S2 ( Node_1 ) SIFS D2 CTS1 RTS2 RTS1 CTS2 DATA2 ACK2 CTS2 RTS2 RTS1 CTS1 NAV(RTS1) Suspension release Suspension release SIFS Random Back Off T CTS T ACK1 T ACK2 SIFS Proposed RTS/CTS Procedure October 2014 B. Zhao and K. Yunoki, KDDI R&D Labs 1.S2 received RTS1 but didn’t receive CTS1 during its waiting time (T CTS ). 2.S2 releases Tx suspension then tries to exchange RTS/CTS with D2. Carrier sensing is disabled before transmitting of RTS2 3.When RTS/CTS is succeeded between S2 and D2, data transmission is executed from S2. Tx including ACK2 should be completed before the end of DATA1. 4

doc.: IEEE 11-14/1381r1 Submission Summary RTS/CTS can be used in various cases, e.g., mitigating hidden terminal issue, negotiating bandwidth in 11ac, or protecting frame with weak signal, etc. –It is necessary to improve the efficiency to achieve higher performance Aiming at the problem, a novel RTS/CTS procedure is proposed in this document –Compatible with the existing IEEE std. –Easy to be implemented. October 2014 B. Zhao and K. Yunoki, KDDI R&D LabsSlide 5

doc.: IEEE 11-14/1381r1 Submission Reference /1380, “Efficiency Measurement for RTS/CTS” /1009r2, “Proposed ax Functional Requirement” October 2014 Slide 6B. Zhao and K. Yunoki, KDDI R&D Labs