A Summary of Inter-WRAN Coexistence Schemes Month Year doc.: IEEE 802.22-yy/xxxxr0 March 2008 A Summary of Inter-WRAN Coexistence Schemes IEEE P802.22 Wireless RANs Date: 2008-03-18 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. > Wendong Hu, STMicroelectronics John Doe, Some Company

Month Year doc.: IEEE 802.22-yy/xxxxr0 March 2008 Abstract This document presents a summary of the Inter-WRAN coexistence schemes in IEEE 802.22. Wendong Hu, STMicroelectronics John Doe, Some Company

March 2008 Overview Wendong Hu, STMicroelectronics

March 2008 Spectrum Etiquette Wendong Hu, STMicroelectronics

March 2008 Spectrum Etiquette Wendong Hu, STMicroelectronics

March 2008 Analytical results The rise over noise is increased in order of fixed frequency planning < Spectrum Etiquette < randomly frequency planning. As the number of available channels, Spectrum Etiquette provides the significant gain on interference level than randomly frequency planning. Wendong Hu, STMicroelectronics

Interference-free Scheduling Month Year doc.: IEEE 802.22-yy/xxxxr0 March 2008 Interference-free Scheduling BS A is operational and CPE A1 transmits CBP packets BS B and CPE B1 starts operating and B1 receives CBP packets from A1 CPEs A1 and B1 reports to their BSs, this enables: Network discovery Spectrum etiquette If no other channel is available, the BSs can use interference-free scheduling (BS B changes its schedule to CPE B1 to avoid interfering with CPE A1) If interference-free scheduling is not effective (e.g. not enough resources) BSs may go the next self-coexistence step: resource sharing (renting/offering, spectrum contention) CPE B1 CPE A1 BS A BS B CPEs in the overlapping area would suffer from interference if no co-existence mechanism is in place. Wendong Hu, STMicroelectronics John Doe, Some Company

Practical considerations for Interference-free scheduling Month Year doc.: IEEE 802.22-yy/xxxxr0 March 2008 Practical considerations for Interference-free scheduling Downstream/upstream bandwidth allocations made by a BS to CPEs in coexistence areas should not change for a certain period of time The BS should try to use the same allocation (time and frequency) for a CPE in the overlapping area This guarantees that the information carried in CBP packets is valid for at least a minimum duration, thus allowing enough time to the recipients of the CBP packets to implement self-interference mitigation mechanism The BS should try to maintain a stable bandwidth allocation schedule, at least for those CPEs in the overlapping area Trade-off: the more dynamic the allocations, the higher the overhead (more inter-cell communication) to implement interference mitigation mechanisms Wendong Hu, STMicroelectronics John Doe, Some Company

Set RS bit in RS-ADV IE in SCH March 2008 Dynamic Resource Renting/Offering Set RS bit in RS-ADV IE in SCH Offorer Procedure Returning Collecting Wendong Hu, STMicroelectronics

Renter Procedure March 2008 Collecting Returning Wendong Hu, STMicroelectronics

On Demand Spectrum Contention March 2008 On Demand Spectrum Contention AODCC – a Distributed, Cooperative, and Real-time spectrum sharing protocol Coexisting networks exchange spectrum access priority numbers via MAC messaging. Random number between [0, 2^32-1], for intra-operator operation Credit tokens, for inter-operator operation The winner, with higher access priority compared to that of the losers, will occupy the spectrum. Wendong Hu, STMicroelectronics

On-Demand Spectrum Contention – Message Flow March 2008 On-Demand Spectrum Contention – Message Flow Wendong Hu, STMicroelectronics

March 2008 Simulation results Wendong Hu, STMicroelectronics

Fairness and Convergence Time March 2008 Fairness and Convergence Time Wendong Hu, STMicroelectronics