Dynamic sensing schemes IEEE P802.22 Wireless RANs Date: 2007-09-5 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. > Liu Jinnan Huawei Hisi

ABSTRACT We give a contribution about how the WRANs do dynamic sensing schemes to save the system resource. Liu Jinnan Huawei Hisi

Background In-band sensing is a two-stage sensing mechanism [1] Intra-frame QPs are set to do fast sensing periodic Inter-frame QPs are set to do fine sensing driven by outcome of fast sensing Out-band sensing is something like Periodic? Non-periodic ? Dynamic? Liu Jinnan Huawei Hisi

Overall System Architecture [2] Higher Layers (IP, ATM, 1394 etc) Overall System Architecture [2] Incumbent Database Regulation and Operational considerations Spectrum Manager PHY Convergence Sub-layer/Bridge MAC Common part SSF Geo location PHY MAC SM SSF Geo location PHY MAC SM SSF Geo location PHY MAC SM SSF Geo location … CPE#1 CPE#2 CPE#N Liu Jinnan Huawei Hisi

To classify channel sets in SM at BS Active set1 :used by BS itself Active set2 :used by neighbor BSs Occupied set: occupied by incumbent in coverage Free set Candidate set: used by the BS as backup channel Potential candidate set: free channel but not in the candidate set Not allowed set: not permit to be used by BS (reflect the channel usage state) Liu Jinnan Huawei Hisi

Incumbent Database Index: Channel Incumbent type Time Geolocation Liu Jinnan Huawei Hisi

Predict incumbent type u set u feature detection on channel N Active set1 After a fine sensing is driven by outcome of fast sensing Incumbent detection time known Channel No. N Known (access database by index ) Predict incumbent type u set u feature detection on channel N Active set2 Sensing driven by events, such as sensing request from neighbor, etc Liu Jinnan Huawei Hisi

(access database by index ) Occupied set Incumbent type known Incumbent detection time known Channel No. Known (access database by index ) Predict time t of releasing channel assign dense sensing after t until free channel is detected. Liu Jinnan Huawei Hisi

Free set Candidate set Potential candidate set Depend priority. The higher priority , the shorter sensing period will be set Potential candidate set Sensing driven by events ,such as switch to candidate set, or sensing request from neighbor, etc. Liu Jinnan Huawei Hisi

Hybrid mechanism for sensing Conclusion Hybrid mechanism for sensing Take advantage both of the channel usage state and incumbent database. Liu Jinnan Huawei Hisi

References [1] IEEE P802.22™/D0.2 Draft Standard for Wireless Regional Area Networks Part 22: Cognitive Wireless RAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Policies and procedures for operation in the TV Bands [2] 22-07-0257-10-0000-Interface-MAC-Sensing Liu Jinnan Huawei Hisi