doc IEEE 802 22 080090 r 0 Month

doc. : IEEE 802. 22 -08/0090 r 0 Month Year Solution for Comment #418 Authors: IEEE P 802. 22 Wireless RANs Date: 2002 -2 -28 Notice: This document has been prepared to assist IEEE 802. 22. 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 grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802. 22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http: //standards. ieee. org/guides/bylaws/sb-bylaws. pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard. " Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Carl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802. 22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@iee. org. > Submission 1 John Doe, Some Company

February 2008 doc. : IEEE 802. 22 -08/0090 r 0 COMMENT #418 7. 4. 7. 1 Page 71 line 31 Submission 2 Soo-Young Chang, Huawei Technologies

February 2008 doc. : IEEE 802. 22 -08/0090 r 0 PROBLEM STATEMENT • It is required for SPDs to notify the PPD of their activeness by sending its information periodically. Currently periodic transmission of beacon frames is considered. However, it is not necessary to send whole beacon frames to notify that they are still active. • In the PPD, one timer is needed for each SPD. Too many timers are required in the PPD to keep track SPDs’ activeness to check whether each SPD is active or not. • For an SPD to provide a heartbeat frame, it should be guaranteed that every a fixed number of superframes an SPD should send an RTS to request to send a beacon frame. This RTS should be accepted by the PPD. But this decision on this acceptance is made by the PPD. It means that it can not be guaranteed that an SPD can send its beacon frame periodically. Submission 3 Soo-Young Chang, Huawei Technologies

February 2008 doc. : IEEE 802. 22 -08/0090 r 0 SUGGESTED REMEDY (1) • Right after an SPD or the NPD sends its beacon frame, the PPD mandatorily sends a beacon frame. It means that RTS codewords sent in the receive period and ACKs or NACKs sent in the ANP period right after a beacon frame is sent by an SPD or the NPD are meaningless (i. e. , it does not carry any information) because any RTS codewords will be disregarded and NACKs will be sent for the PPD to send its beacon frames in the following superframes. • The Rx and ANP period after a beacon frame from an SPD or the NPD can be used for the notification of an SPD’s activeness. Submission 4 Soo-Young Chang, Huawei Technologies

February 2008 doc. : IEEE 802. 22 -08/0090 r 0 SUGGESTED REMEDY (2) • The basic concept is to transmit the subchannel information of an SPD or the NPD for the PPD to be informed periodically in the Rx period. – If it receives a beacon frame from the PPD with the NPD indication subfield set to ‘ 10’, each SPD or the NPD notifies its activeness by sending an RTS codeword corresponding to its subchannel number in the Rx period. – One of RTS codewords is transmitted in the following Rx period. As an example, for 6 MHz TV band (or 30 subchannel) case, in the Rx period, 30 codewords are assigned for all 30 subchannels. – Information on received RTS codewords is sent to MLME by PLME using a new primitive, PLME-ACTIVE-SPD. indication. Submission 5 Soo-Young Chang, Huawei Technologies

February 2008 doc. : IEEE 802. 22 -08/0090 r 0 SUGGESTED REMEDY (3) • If the frequency band occupied by a microphone exists in two adjacent subchannels, these two subchannels should be reported at the same time. For this case, only information on lower subchannel can be delivered for this scheme. PPD frame with NPD indication 10 Rx period The SPD sends an RTS codeword corresponding its subchannel. To make sure that this codeword is received by the PPD, this procedure can be repeated once again. Submission 6 Soo-Young Chang, Huawei Technologies

February 2008 doc. : IEEE 802. 22 -08/0090 r 0 References • Comments for the second TG 1 letter ballot submitted by Soo-Young Chang, Nov. 8, 2007. • 22 -07/0540 r 1, Soo-Young Chang, Some Solutions on Comments Submitted by Soo-Young Chang, Nov. 2007. Submission 7 Soo-Young Chang, Huawei Technologies