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120MHz channelization solution

This article proposes three 120MHz channelization solutions, detailing design considerations to enhance transmission efficiency and coexistence in Chinese spectrum. It discusses channelization approaches, regulatory extensions, challenges, and solutions for improved data transmission methodologies.

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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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