CBP Success Probability May 2008 doc.: IEEE 802.22-yy/xxxxr0 May. 2008 CBP Success Probability IEEE P802.22 Wireless RANs Date: 2008-05-11 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. > Cheng Shan, Samsung Electronics

May. 2008 Abstract This contribution calculates the CBP packets’ coverage, as well as the probability that a CBP packet could successfully reach a neighboring cell This contribution responses to the resolution of comment #406 Cheng Shan, Samsung Electronics

Basic Parameters May. 2008 CBP Data Rate: 418bit/10ms=0.0418Mbps (8.4, [1]) Detection SNR Threshold: ~1dB for QPSK ½ rated 3-repitition CPE One directional WRAN antenna G/T= -19.52 dB as in [2] Directional pattern as in section 8.12 of [1] One Omni-directional sensing antenna Type I: G/T= -19.52 dB, as in [2] Type II: G/T= -35.63 dB, as in [3] BS One Omni-directional WRAN antenna G/T= -16.95 dB, as in [2] Propagation Model F(50,90) Cheng Shan, Samsung Electronics

CBP Sensitivities for Different Antenna Types May. 2008 CBP Sensitivities for Different Antenna Types CPE CPE WRAN Antenna at direction with max gain: 25.2 dB (μV/m) Sensing Antenna Type I: 24.9 dB (μV/m) Sensing Antenna Type II: 41 dB (μV/m) BS BS WRAN Antenna: 21.6 dB (μV/m) Cheng Shan, Samsung Electronics

May. 2008 Max. Propagation Distance: CPE-to-CPE w/ WRAN Antenna for CBP Reception Cheng Shan, Samsung Electronics

May. 2008 Max. Propagation Distance: CPE-to-CPE w/ Sensing Antenna Type I for CBP Reception Cheng Shan, Samsung Electronics

May. 2008 Max. Propagation Distance: CPE-to-CPE w/ Sensing Antenna Type II for CBP Reception Cheng Shan, Samsung Electronics

Max. Propagation Distance: BS-to-CPE w/ WRAN Antenna for CBP Reception May. 2008 Max. Propagation Distance: BS-to-CPE w/ WRAN Antenna for CBP Reception Cheng Shan, Samsung Electronics

May. 2008 Max. Propagation Distance: BS-to-CPE w/ Sensing Antenna Type I for CBP Reception Cheng Shan, Samsung Electronics

May. 2008 Max. Propagation Distance: BS-to-CPE w/ Sensing Antenna Type II for CBP Reception Cheng Shan, Samsung Electronics

Max. Propagation Distance: BS-to-BS May. 2008 Max. Propagation Distance: BS-to-BS Cheng Shan, Samsung Electronics

Short Summary May. 2008 CPE-to-CPE CBP Transmission CBP packets could not reach far with WRAN antenna or sensing antenna Type II for reception; Reception with sensing antenna Type I improves the performance; BS-to-CPE With WRAN antenna or sensing antenna Type II for reception, the BS transmitted CBP cannot reach out its own cell; With sensing antenna Type II for reception, the BS transmitted CBP can reach into its neighboring cell; BS-to-BS BS can always receive CBP packets transmitted by its neighbor BS, given enough buffer time propagation; Cheng Shan, Samsung Electronics

May. 2008 Simulation The following simulations illustrate how likely two neighboring cells could exchange CBP (or, there is at least one CBP path existing, either CPE-to-CPE, BS-to-CPE, or BS-to-BS) in a practical scenario; Cheng Shan, Samsung Electronics

May. 2008 Simulation Setups Random active CPEs are dropped into the area of two neighboring cells according to a certain density Each CPE points its WRAN antenna to its associated BS BS association Rule 1: a CPE in overlap area randomly chooses a BS for association There are chances for face-to-face CPE-to-CPE CBP transmission Rule 2: a CPE chooses the nearer BS for association Always back-to-back CPE-to-CPE CBP transmission Cheng Shan, Samsung Electronics

May. 2008 A Snapshot Cheng Shan, Samsung Electronics

May. 2008 4W BS Cheng Shan, Samsung Electronics

May. 2008 100W BS Cheng Shan, Samsung Electronics

May. 2008 Conclusion CPE-to-CPE CBP transmission is not reliable, large density of operating CPEs is needed to assure good chances of CBP exchange via CPEs An sensing antenna with better sensitivity (Type I) may help a lot in CBP detection BS-to-BS CBP transmission is reliable Propagation delay must be investigated Cheng Shan, Samsung Electronics

Improvement Options for CBP Detection May. 2008 Improvement Options for CBP Detection Rely more on BS-to-BS transmission; The SCW buffer time needs to be carefully designed; Using sensing antenna type I and rely more on BS-to-CPE transmission; Buffer time also needs to be considered; Set up CBP-bridge CPEs at the cell edge which could associate to multiple BSs simultaneously; TG2 issue? Cheng Shan, Samsung Electronics

References [1] IEEE 802.22 DRAFT v1.0 May. 2008 References [1] IEEE 802.22 DRAFT v1.0 [2] 22-04-0002-16-0000_WRAN_Reference_Model [3] 22-06-0051-09-0000_Sensing_Thresholds Cheng Shan, Samsung Electronics