Dynamic OFDM Symbol Duration for Enhanced Efficiency in Wireless Communication
"Proposed methods for dynamic 1x/4x OFDM symbol duration in IEEE 11-14/1229r1 document aim to boost efficiency by adjusting symbol duration for various packet lengths. The two methods introduced by MediaTek can optimize payload duration and CP overhead, potentially improving spectrum utilization and overall performance in wireless networks."
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September 2014 doc.: IEEE 11-14/1229r1 Dynamic OFDM Symbol Duration Date: 2014-09-15 Authors: Name Affiliations Address No. 1, Dusing 1st Road, Hsinchu, 300 Taiwan Phone email +886-3-567- 0766 Alan Jauh MediaTek alan.jauh@mediatek.com MediaTek Jianhan Liu jianhan.liu@mediatek.com MediaTek Thomas Pare thomas.pare@mediatek.com chaochun.wang@mediatek. com MediaTek ChaoChun Wang MediaTek James Yee james.yee@mediatek.com Submission Slide 1 Alan Jauh et. al., MediaTek
September 2014 doc.: IEEE 11-14/1229r1 Background and Objectives 4x OFDM symbol duration may enhance efficiency for longer payloads and may have benefit of less CP overhead and finer frequency granularity [1][2] . Relative to 4x OFDM symbol duration, current 1x OFDM symbol duration may have less padding bits and shorter payload duration for short packets. Methods for supporting dynamic OFDM symbol duration may result in greater overall efficiency. Submission Slide 2 Alan Jauh et. al., MediaTek
September 2014 doc.: IEEE 11-14/1229r1 Method 1 (Per Packet Based) Define one bit Symbol_duration in SIG-A to specify Symbol_duration = 0 : OFDM symbol duration 3.2us Symbol_duration = 1 : OFDM symbol duration 12.8us CP ratio Specify 4x mode CP ratio Normal GI : 1/4 (TBD) Short GI : 1/16 (TBD) Define 2 bits of CP_ratio in SIG-A to specify the CP ratio and remove SGI indication CP_ratio = 0 : 1/4 CP_ratio = 1 : 1/8 CP_ratio = 2 : 1/16 CP_ratio = 3 : 1/32 Submission Slide 3 Alan Jauh et. al., MediaTek
September 2014 doc.: IEEE 11-14/1229r1 Method 2 (NAV protected) This operation can be protected by a new MAC protocol, e.g. use CTS-to-self with indication bit(s) AP send CTS-to-self to reserve TXOP for legacy devices 11ax devices decode the indication bit(s) to override normal CTS- to-self operation and decode the NAV protected packet(s) For example, the 80MHz OFDM packet with clock scale down can be used in each 20MHz BW With clock scale down can reuse the design to get 1/4 frequency granularity 4x CP length in time Submission Slide 4 Alan Jauh et. al., MediaTek
September 2014 doc.: IEEE 11-14/1229r1 Summary Two methods to enable dynamic 1x/4x OFDM symbol duration are proposed. Method 1 modifies per-packet PHY preamble and enables dynamic switching between 1x and 4x OFDM symbol duration. Method 2 enables 4x OFDM symbol duration in NAV protected periods. With 1/4 clock scale down from wider bandwidth mode, it is possible for design reuse. Submission Slide 5 Alan Jauh et. al., MediaTek
September 2014 doc.: IEEE 11-14/1229r1 Reference 1. 11-14/0801, envisioning 11ax phy structure part ii , Dongguk Lim(LG Electronics) 2. 11-14/0804, Envisioning 11ax phy structure part-I , Jinsoo Choi (LG Electronics) 3. 11-14/0839, Discussion on OFDMA in IEEE 802.11ax , Jinsoo Ahn (Yonsei Univ) 4. 11-14/0855, Techniques for Short Downlink Frames , Brian Hart (Cisco Systems) 5. 11-14/0858, on Frequency Sensitive Multiplexing in WLAN Systems , Kaushik Josiam (Samsung) 6. 11-13/1057 , Legacy support on hew frame structure , Jinyoung Chun(LG Electronics) Submission Slide 6 Alan Jauh et. al., MediaTek
