1. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 1 Credit Tokens in Renting and Contention IEEE P802.22 Wireless RANs Date: 2008-02-27 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 IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs 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 Chairhttp://standards.ieee.org/guides/bylaws/sb-bylaws.pdf Carl R. StevensonCarl 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.patcom@iee.org >

2. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 2 Abstract A summary of the credit tokens rental protocol as part of the integrated, hierarchical coexistence methodology is presented.

3. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 3 Credit-Token Relevant Information Elements IE Reference (WDv0.4.7) Description RR_REQ6.7.1.2.1.8/Table 15 8 bytes Rental Request - Dynamic resource renting and offering mechanism, includes renters bid, start time and end time. RS_ADV6.7.1.2.1.18/Table 25 8 bytes Resource Advertisement - Contains rental start time, stop time, and minimum credit token bid per resource. Sent in SCH or CBP. CC_REQ6.7.1.2.1.5/Table 12 28 bytes Sent by the contention source in a CBP packet to bid for spectrum. Includes credit token bid, requested TV channel, and start time in number of frames CC_RSP6.7.1.2.1.6/Table 13 23 bytes Sent by contention destination (present occupant of desired spectrum) to inform contention source of contention outcome. Contains success or reject message to specific MAC address, and if reject, the reason for the reject (CCNCT too small).

4. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 4 Dynamic Resource Renting/Offering (DRRO)

5. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 5 DRRO and Credit Tokens When several renters compete simultaneously for the same offer and the offeror cannot supply all renters requests, the channel allocation between competing renters is resolved using a pseudo-economic renting/offering allocation procedure The CT-based radio resource allocation procedure guarantees exclusive access to the offerors unused resources by the renters for an agreed period between the offeror and renters During that period, the renter is granted the resource during which the offeror will not attempt to use the resource After the guaranteed rental time period has elapsed, collecting procedures (resource recovery) can be initiated. Returning procedures can occur at any time.

6. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 6 Offeror Procedure Fig. 74 in WDv0.4.7 Set RS bit in RS-ADV IE in SCH Returning Collecting

7. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 7 Renter Procedure Fig. 75 in WDv0.4.7 Returning Collecting

8. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 8 Adaptive On-Demand Channel Contention

9. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 9 AODCC and Credit Tokens If dynamic resource renting and offering still do not satisfy spectrum needs, proceed to contention for channel sharing If contending base stations belong to the same operator, contention is resolved using the randomly generated Channel Contention Number If contending base stations belong to different operators, contention is resolved using credit tokens

10. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 10 Inter-Operator Contention Resolution Each contending BS has a predefined credit token budget CC_REQ carries contenders (sources) bid –Start time, stop time, and number of credit tokens offered per resource Destination BS compares offers for resources with its predetermined value of the resource If the contention source bid exceeds the minimum, the destination BS has to release its resource for the agreed period

11. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 11 Channel Contention Procedure Fig. 78 in WDv0.4.7 BS is looking for spectrum resources Next page

12. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 12 Channel Contention Resolution Algorithm Fig. 79 in WDv0.4.7

13. doc.: IEEE 802.22-08/0081r0 Submission February 2008 Stephen Kuffner, MotorolaSlide 13 References IEEE 802.22-07/0121r1, Proposed text changes and Comment Resolution to Section 6.21.2 Self-coexistence in IEEE 802.22/D0.2 Draft Standard, D. Cavalcanti, C. Cordeiro, D. Grandblaise, W. Hu, T. Hyon, B. Ji, March 2007.