Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Questions/Comments on AV-OFDM MAC] Date Submitted: [April 16, 2008] Source: [Chang woo Pyo, Zhou Lan, Fumihide Kojima, Tuncer Baykas, Chin Sean Sum, Junyi Wang, Azizur Rahman, Hiroyuki Nakase, Hiroshi Harada, Shuzo Kato] Company [National Institute of Information and Communications Technology (NICT)] Address1[3-4 Hikari-no-oka, Yokosuka-shi, Kanagawa 239-0847, Japan] Voice1:[+81-46-847-5074] , FAX1: [+81-46-847-5440] E-Mail[] Re: [In response to TG3c Call for Proposals (IEEE P802.15-07-0586-02-003c)] Abstract: [Questions/Comments on AV-OFDM MAC] Purpose:[To be considered in TG3C baseline document.] 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 contributors acknowledge and accept that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

2. Summary • Identify the “need-to-clarify” items in AV-OFDM

3. SCAN • Comments are shown in the next page

4. Comments for AV-OFDM (related to SCAN) • Comment 1 • Which channel is used to scan in LRP channels (LRP1, LRP2, or LRP3) • Comment 2 • What is the definition of omni - covering 360 degree or part of 360 degree • If omni is covering the part or 360 degree, how many directions are supported by each device • Comment 3 • What is the definition of base rate of beacon • Comment 4 • The reason of channel switching time of 1000us and CCA time of 9us

5. Starting a piconet • Comments are shown in the next page

6. Comments for AV-OFDM (related to starting a piconet) • Comment 5 • The reason of channel selection not complying with 15.3 • Comment 6 • Does AV-OFDM support directional beacons • Comment 7 • What is the date rate for beacon (related to comment 2) • Comment 8 • What data rates are supported in CAP

7. Association • Comments are shown in the next page

8. Comments for AV-OFDM (related to Association) • Comment 9 • What data rate is used for association • Comment 10 • AV-OFDM is no procedure of DEV-DEV association

9. Beamforming • Comments are shown in the next page

10. Comments for AV-OFDM (related to Beamforming) • Comment 11 • What is the difference between beamforming antenna and directional antenna • Comment 12 • What is the function of RX diversity field in preamble • Comment 13 • Does AV-OFDM support symmetric and asymmetric Tx and Rx ant. in beamforming

11. Channel probing • Comments are shown in the next page

12. Comments for AV-OFDM (related to channel probing) • Comment 14 • Does AV-OFDM support channel probing • If support, how to perform channel probing

13. Streaming • Comments are shown in the next page

14. Comments for AV-OFDM (related to streaming) • Comment 15 • What is the value for the minimum fragment size • Comment 16 • What is the definition of ACK group • Comment 17 • Details of retransmission procedure in AV-OFDM • Comment 18 • What is the data rate for directional ACK • Comment 19 • The reason of directional ACK not complying to 15.3b • ACK information of directional ACK is included in header not payload

15. Appendix: Channel Index