Submission Title: [Questions for CWPAN from IEEE802.15.4c Study Group] Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Questions for CWPAN from IEEE802.15.4c Study Group] Date Submitted: [Dec. 2006 ] Source: [Kuor-Hsin Chang, Liang Li] Company: [Freescale Semiconductor, Vinno Technology] Address: [2100 E. Elliot Rd, MD: EL542, Tempe, AZ 85284, USA] [2 Xinxi St, Building D, Haidian District, Beijing, China 100085] Voice:[1-480-413-4441, 86-10-139-11895301], E-Mail:[kuor-hsin.chang@freescale.com, liangli@vinnotech..com] Re: [ IEEE 802.15.4c ] Abstract: [Document the questions raised by the 802.15.4c Study Group about the CWPAN standard during the 802 plenary meeting at Dallas on November 2006] Purpose: [To encourage discussion.] 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. Submission Kuor-Hsin Chang, Freescale Semiconductor Liang Li, Vinno Technologies Inc.

On page 16 of contribution 15-06-0463, what’s the meaning of L? In contribution 15-06-0463, is the calculation of CCA modified or only the procedure of CSMA modified? In contribution 15-06-0462, it will be very beneficial to add the throughput plot for the current 802.15.4 MAC procedure. It will be very beneficial for the CWPAN to provide the plot that compares the packet error rate vs. SNR of the OQPSK modem (15.4-2006) with the QPSK + Chirp coding (C-WPAN) modem. Where is the raise-cosine filter (with roll-off factor of 0.5) used in the CWPAN modem system? Is it used as the Transmitting Filter before transmission (as it is used in 802.15.4-2006 for 868MHz band) or it is used as the pulse-shaping filter before modulation? Is it possible for CWPAN to adopt another PN sequence that has similar characteristic (binary, circular shift by 2 to each other) as the PN sequence used in 802.15.4 instead of the one used in current standard? Is it possible for the CWPAN to have the same symbol-to-PN-code mapping for SFD and data payload? Submission Kuor-Hsin Chang, Freescale Semiconductor Liang Li, Vinno Technologies Inc.