Proposed Novel RTS/CTS Procedure for Higher Throughput in Wireless Networks
This document presents a novel RTS/CTS procedure aimed at improving throughput in dense wireless environments by addressing issues related to hidden and exposed terminals. The proposed scheme optimizes the use of RTS/CTS to enhance performance without requiring significant changes to existing IEEE 802.11 standards. Through measurements and a detailed description of the procedure, potential gains in throughput efficiency are explored.
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October 2014 doc.: IEEE 11-14/1381r1 Novel RTS/CTS Procedure Date: 2014-10-30 Authors: Name Affiliations Address 3-10-10, Iidabashi, Chiyoda-ku, Tokyo 102-8460 JAPAN Phone email Bingxuan Zhao KDDI R&D Labs bi-zhao@kddilabs.jp Katsuo Yunoki KDDI R&D Labs yunoki@kddilabs.jp Submission Slide 1 B. Zhao and K. Yunoki, KDDI R&D Labs
October 2014 doc.: IEEE 11-14/1381r1 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]) Submission Slide 2 B. Zhao and K. Yunoki, KDDI R&D Labs
October 2014 doc.: IEEE 11-14/1381r1 Description of the proposed scheme RTS Gain? Data Node_1 Src Dst Node_2 CTS 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. Submission 3 B. Zhao and K. Yunoki, KDDI R&D Labs
October 2014 doc.: IEEE 11-14/1381r1 Proposed RTS/CTS Procedure SIFS RTS1 CTS1 DATA1 S1 (Src) TACK1 SIFS SIFS D1 (Dst) RTS1 ACK1 CTS1 Random Back Off SIFS SIFS RTS1 DATA2 RTS2 CTS2 S2 (Node_1) NAV(RTS1) TACK2 TCTS SIFS Suspension release ACK2 CTS2 RTS2 D2 1. S2 received RTS1 but didn t receive CTS1 during its waiting time (TCTS). 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. Submission 4 B. Zhao and K. Yunoki, KDDI R&D Labs
October 2014 doc.: IEEE 11-14/1381r1 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 802.11 std. Easy to be implemented. Submission Slide 5 B. Zhao and K. Yunoki, KDDI R&D Labs
October 2014 doc.: IEEE 11-14/1381r1 Reference 1. 11-14/1380, Efficiency Measurement for RTS/CTS 2. 11-14/1009r2, Proposed 802.11ax Functional Requirement Submission Slide 6 B. Zhao and K. Yunoki, KDDI R&D Labs
