1. Doc: IEEE 802.15-13-0649-00-0008 Submission November 2013 Hernandez,Li,Dotlić,Miura (NICT)Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ Addressing coexistence PAC devices with 802.11 devices ] Date Submitted: [ November 2013 ] Source: [Marco Hernandez, Huan-Bang Li, Igor Dotlić, Ryu Miura ] Company: [NICT] Address: [3-4 Hikarino-oka, Yokosuka, 239-0847, Japan] Voice:[+81 46-847-5439] Fax: [+81 46-847-5431] E-Mail:[] Re: [In response to call for technical guidance document contributions TG8] Abstract:[ ] Purpose:[Material for discussion in 802.15.8 TG] Notice:This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release:The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

2. Doc: IEEE 802.15-13-0649-00-0008 Submission Channelization for 11ac November 2013 Hernandez,Li,Dotlić,Miura (NICT)Slide 2

3. Doc: IEEE 802.15-13-0649-00-0008 Submission Channelization for 11ac November 2013 Hernandez,Li,Dotlić,Miura (NICT)Slide 3 802.11ac devices support 80 MHz channels with 20 MHz and 40 MHz for legacy (backward compatibility) to 802.11n devices, and optionally 160 MHz channels. The presence of primary 20 MHz sub-channels is necessary to guarantee coexistence with legacy 802.11n devices.

4. Doc: IEEE 802.15-13-0649-00-0008 Submission Channelization for 11ac November 2013 Hernandez,Li,Dotlić,Miura (NICT)Slide 4 Example: two 80 MHz 802.11ac APs select the same 80 MHz channel bandwidth but one AP puts its primary 20 MHz channel within the lower 40 MHz and the other AP puts its primary 20 MHz channel within the upper 40 MHz. What this means is that 802.11n clients associated to the first AP can transmit 20 or 40 MHz as usual, at the same time as 802.11n clients associated to the second AP can transmit 20 or 40 MHz in parallel. What is new in 802.11ac is the ability for any 802.11ac client that sees that the whole 80 MHz as available to invoke a very high-speed mode and to transmit across the whole 80 MHz.

5. Doc: IEEE 802.15-13-0649-00-0008 Submission Channelization for 11ac The presence of primary 20 MHz sub-channels guarantees coexistence with legacy 802.11n devices. Coexistence in this case means backward compatibility with 802.11n devices or concurrent operation of 802.11ac devices and 802.11n devices (with low probability of interference of course). November 2013 Hernandez,Li,Dotlić,Miura (NICT)Slide 5

6. Doc: IEEE 802.15-13-0649-00-0008 Submission Coexistence with 11 devices PAC devices cannot distinguish 11a,b,g,n,ac devices, because the PAC PHYs are different. By choosing 20 MHz channels for PAC devices, it does not guarantee coexistence because the PHYs of 802.11n and 802.11-ac devices do not talk with PAC radios. 802.11n or 802.11ac devices may be using 40 MHz, 80 MHz or 160 MHz channels. 20 MHz channels for PAC devices, it does not guarantee coexistence either. In terms of coexistence, PAC devices may use distributed power control to ensure coexistence with Wi-Fi devices. November 2013 Hernandez,Li,Dotlić,Miura (NICT)Slide 6