[Distributed Sensing for Active 2 Set Channels] Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 [Distributed Sensing for Active 2 Set Channels] IEEE P802.22 Wireless RANs Date: 2006-10-10 Authors: 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. ETRI

Introduction to Distributed Sensing Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Introduction to Distributed Sensing Distributed Sensing Distributed Sensing scheme yields more reliable incumbent detection through cooperation of BS and all CPEs. Under distributed sensing operation, all CPE and BS should participate cooperative sensing not only their used channel (Active 1 set) but also other user’s used channel (Active 2 set) Basic assumption for this distributive sensing scheme is that BS and CPE have separate sensing receiver. All the current communication channels (i.e., Active Channel Set 1 and 2) have differently aligned QP in time.  Distributed QP ETRI

Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Distributed Sensing This scheme is proposed to support the better Incumbent protection as included in FRD A quotation from FRD (Sec.15.1.5) ETRI

Down Stream Beam Pattern of CH 1 Can’t detect Hidden Node Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Hidden Node Problem Down Stream Beam Pattern of CH 1 BS CPE 1 Active1 Set:CH1 Active2 Set:CH2,3 CH1 Can’t detect Hidden Node Local Interferer in CH 1 Wireless Microphone CH1 CH2 CPE1 IU protection Fail due to the Hidden Node CH 3 CPE 4 Active1 Set:CH3 Active2 Set:CH1,2 CPE2 CPE3 CPE4 Therefore, it is needed not only Active set2 sensing but also Active set1 sensing ETRI

When BS and CPE sense Active 2 set? Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 When BS and CPE sense Active 2 set? In order to sense Active 2 set properly During a channel’s QP, the host of the channel senses its Active 1 Set. Also, others sense the same channel as a sensing of Active 2 Set and report their sensing results to BS. Thus, BS has N sensing results for the active channels, where N is the number of active CPEs in BS. To sense the Active 2 Set, it is needed that all CPEs and BS should know the other channel’s QP positions (QP synchronization discussed slide 12). ETRI

Possible QP assign scenarios Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Possible QP assign scenarios Simultaneous QP in the same cell Distributed QP Active1 sensing Active1 sensing Active2 sensing Active2 sensing CH 1 CH 1 CH 2 CH 2 CH 3 CH 3 QP ETRI

Possible QP assign scenarios Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Possible QP assign scenarios Drawbacks of Simultaneous QP Active1 sensing Active2 sensing -long QPs are needed -There are sensing redundancy CH 1 CH 2 CH 3 Additionally required QP Minimum required QP to sense a channel ETRI

Possible QP assign scenarios Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Possible QP assign scenarios Simultaneous QP Distributed QP Remove somewhat duplicate information. CH 1 CH 1 CH 2 CH 2 CH 3 CH 3 -Additional QPs are needed -There are sensing redundancy -Enhanced Throughput Minimum required QP to sense a channel ETRI

Additional features of Distributed QP Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Additional features of Distributed QP Self-interference free sensing In the vicinity of Cell or Sector, it is required QP information for occupied by other WRAN channels (i.e., Active 2 set) to sense without self interference. This yield more accurate sensing for other active 2 sets. QP synchronization needs channel list for all BS and CPE Current Draft v.0.1 can support the channel list. Therefore, WRAN enable QP synchronization. Based on the QP synchronization, WRAN more efficiently sense without self interference by using the proposed distributed QP scheme. ETRI

Single Channel 3 Sectors Case Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Single Channel 3 Sectors Case BS CH1 CH2 CH1 CH2 CPE1 CPE2 CPE3 Sense during the CH2’s QP CPE4 To give more information for CH2, CH1’s CPE should sense to CH2 during the CH2’2 QP ETRI

Single Channel Overlap Cell Situation Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Single Channel Overlap Cell Situation BS1 BS2 CH2 CH2 CH1 CPE1 CPE3 Sense during the CH2’s QP CPE4 CPE2 To give more information to BS 1, CH1’s CPE should sense to CH2 during the CH2’2 QP ETRI

Refer the joint proposal Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 QP Synchronization Quiet Periods Synchronization To support multiple channels transmission, BS would employ a Spectrum Manager All channel information in the cell should report to SM (Spectrum Manager) A BS’s all MAC write SCH every super frame duration under the control of SM This SM control messages are delivered by periodic or aperiodic manner Therefore all QPs in the same cell are synchronized under the control of SM Refer the joint proposal ETRI

Month Year doc.: IEEE 802.22-yy/xxxxr0 Oct 2006 Conclusions QPs should be allocated in different time slot between active channels to be sensed. Proposed distributed QP support more information to protect incumbent users Also, distributed QP yield more efficient sensing without self-interference ETRI