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120MHz channelization solution

120MHz channelization solution. Authors:. Date: 2010-11-10. Nov. 2010. Abstract. Current specification support an efficient channelization in China’s (5,725 ~ 5,850 MHz) spectrum but lack of detailed design

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120MHz channelization solution

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  1. 120MHz channelization solution Authors: Date: 2010-11-10 LvKaiying, ZTE Corporation

  2. Nov. 2010 Abstract • Current specification support an efficient channelization in China’s (5,725 ~ 5,850 MHz) spectrum but lack of detailed design • Three 120MHz channelization and operation solutions are proposed in this contribution LvKaiying, ZTE Corporation

  3. Approach 1 • Shifted 20MHz, 40MHz, and 80MHz channels and one optional 120MHz channel • 7.5MHz left shifted center frequency allows six 20 MHz channels and three 40 MHz channels • No change to current 20MHz, 40MHz and 80MHz signal design • Need to define a new 120MHz signal, which could allow a combination of current channels or a complete 120MHz channel signal. • Approach2 • Non-shifted 20MHz, 40 MHz and 80 MHz channels as current 20MHz, 40MHz and 80MHz design • One optional 120MHz channel • Need to define a new 120MHz signal, which could allow a combination of current channels or a complete 120MHz channel signal. 120MHz Channelization Approaches LvKaiying, ZTE Corporation

  4. Channelization Approach 1 Legacy mode 5835 5735 20MHz 40MHz 80MHz 12.5MHz 7.5MHz Enhanced mode 20MHz 40MHz 80MHz 120MHz LvKaiying, ZTE Corporation 5847.5 5727.5 f MHz

  5. 802.11ac AP starts a BSS alternatively operating on shifted and non-shifted channels in time domain, with two primary channels defined for shifted channel set and non-shifted channel set respectively. • 802.11ac AP alternatively sends beacons and other control & management frames on shifted and non-shifted channels in time domain. • Legacy STAs access and associate with 802.11ac AP in non-shifted channels. • 802.11ac STAs can access and associate with 802.11ac AP in either shifted or non–shifted channels. • CFP/CP window parameters are configured to guarantee no time confliction between transmission on two channel sets. Solution A based on channelization approach 1 LvKaiying, ZTE Corporation

  6. Solution A based on channelization approach 1 LvKaiying, ZTE Corporation

  7. Coexistence • OBSS scanning before and after BSS establishment • AP Alternatively scans OBSS in shifted and non-shifted channels to detect OBSS overlapping. • STAs perform OBSS scanning in shifted and non-shifted channels and report to AP • AP may shift to other channels to avoid interference to the existing OBSS. • Backward compatibility • The legacy mode (non-shifted channelization) can be used to support legacy devices. • 120MHz Transmission (optional) • The enhanced mode (shifted channelization) can provide 120MHz data transmission when all 6 20MHz channels are idle. Solution A Analysis LvKaiying, ZTE Corporation

  8. Regulatory extension for 5.7GHz for Chinese spectrum. • 120MHz channel definition with • New preamble design • New pilot design • New sub-carrier sequence design • RF front-end implementation design • Interference control • Complex OBSS scanning for overlapped & non-orthogonal channels Challenges to Solution A LvKaiying, ZTE Corporation

  9. Channelization Approach 2 Legacy mode 5835 5735 20MHz 40MHz 80MHz 7.5 12.5 120MHz mode 120MHz f MHz 5847.5 5727.5 LvKaiying, ZTE Corporation

  10. Current design for 20/40/80MHz transmission • New 120MHz design for potential 120MHz channel for data-only transmission • 120MHz data transmission is available only when five non-shifted 20 MHz channels are detected as idle by both initiator and responder • Quintuplicate RTSs/CTSs are transmitted in five non-shifted20 MHz channels to reserve 120MHz channel • Quintuplicate ACKs are transmitted in five 20 MHz channels • Possible methods for 120MHz data transmission detection • by preamble detecting on five 20MHz channels [preferred] • by 120MHz bandwidth information indicated in RTS/CTS frame • by explicitly phased division to indicate 120MHz transmission Channelization Approach 2 LvKaiying, ZTE Corporation

  11. Channelization Approach 2 LvKaiying, ZTE Corporation

  12. Basically burst-style time division of legacy transaction period and 120MHz data only transmission period • Only data frames and some management frames transmitted with 120MHz bandwidth; • Control frames and most networking joining related management frames transmitted with current channels. Solution B based on channelization approach 2 LvKaiying, ZTE Corporation

  13. Allow phased division of legacy transaction period and 120MHz data only transmission period • AP controlled or STA requested phased division of legacy transaction period and120MHz data only transmission period • CCA detection on 5 non-shifted 20MHz channels. If all 5 channels are idle, then AP sends CTS-to-self on 5 non-shifted20MHz channels to reserve 100MHz channel • After120MHz transaction phase starts, AP and 120MHz recipient STAs exchange RTS/CTS on 5 legacy 20MHz channels to avoid OBSS interference Solution Cbased on channelization approach 2 LvKaiying, ZTE Corporation

  14. 120MHz channel definition with • New preamble design • New pilot design • New sub-carrier sequence design • RF front-end implementation design • RTS detection by preamble detection on five 20MHz channels Challenges to channelization approach 2 LvKaiying, ZTE Corporation

  15. Thank you! LvKaiying, ZTE Corporation

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