CX-CBP in 3.65GHz – Simulation results Nov. 2008 CX-CBP in 3.65GHz – Simulation results Date: 2008-11-03 Authors: Notice: This document has been prepared to assist IEEE 802.19. 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 802.19. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.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 TAG 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 <shellhammer@ieee.org> 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 802.19 TAG. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Alvarion

802.16h CX-CBP – Frame structure Nov. 2008 802.16h CX-CBP – Frame structure CX-Frame structure is shown below: Alvarion

CX-CBP General features Nov. 2008 CX-CBP General features Equal operational time assigned to each technology 10ms for each CXCBI and CXCSBI Operation during CXCBI Scheduled transmit opportunities Listen-before-talk Contention window and quiet periods Longer slots are defined for 802.16h as compared with 802.11y Priority is given to 802.11y Logarithmic back-off Alvarion

Synchronization CX-Frame is synchronized with GPS-like time source Nov. 2008 Synchronization CX-Frame is synchronized with GPS-like time source 802.16h-based systems are using CXSBI in a synchronized mode Sync of 802.11y with CXCBI is not mandated Two operational modes Sync. CX-CBP The 802.11 AP limits the 802.11y operation to CXCBI See Annex in “Parameters for simulation of Wireless Coexistence in the US 3.65GHz band” document Un-sync. CX-CBP No limitation is imposed Alvarion

Nov. 2008 Parameters Based on: IEEE 802.19-07/11r15, Parameters for simulation of Wireless Coexistence in the US 3.65GHz band Scenario A “Outdoor-to-outdoor” Offered load for each system: In order to find the maximal capacity for each system, simulations were performed in no-interference state, and overloading each system. The maximum throughputs derived were (for 5 MHz channel): 802.16 DL: 7.2 Mbps 802.16 UL: 4 Mbps 802.11 overall: 8 Mbps The offered load in the interference simulation for each system was based on these relations between the maximum achievable loads, modified according to the required total load Alvarion

Legend Abbreviations NCX: No Coexistence Protocol Nov. 2008 Legend Abbreviations NCX: No Coexistence Protocol Reference for 802.11y / 802.16h operation SCX: Sync CX-CBP. Synchronized Coordinated Contention-Based Protocol UCX: Unsync CX-CBP. Unsynchronized Coordinated Contention-Based Protocol NI: No Interference Reference for max. performance NL: Only control elements are transmitted by the interfering system 802.16h CX-CBP: according to defined operation Alvarion

Nov. 2008 Cell sizes Cell size for each system was chosen to be the minimum between its DL and UL ranges. Alvarion

Simulation #1 Scenario A (outdoor to outdoor) 10 users per system Nov. 2008 Simulation #1 Scenario A (outdoor to outdoor) 10 users per system Total offered load for both systems: 9.6 Mbps 802.16 offered load of 5.75 Mbps 375 Kbps DL per user 200 Kbps UL per user 802.11 offered load of 4 Mbps 267 Kbps DL per user 133 Kbps UL per user 5 MHz bandwidth Retransmissions in 802.11 and 802.16 Alvarion

Hidden Node Probability Behavior Nov. 2008 Hidden Node Probability Behavior Alvarion

Hidden Node Probabilities (Mean) Nov. 2008 Hidden Node Probabilities (Mean) Alvarion

Hidden Node Probabilities (10th percentile) Nov. 2008 Hidden Node Probabilities (10th percentile) Alvarion

Hidden Node Probabilities (Median) Nov. 2008 Hidden Node Probabilities (Median) Alvarion

Hidden Node Probabilities (90th percentile) Nov. 2008 Hidden Node Probabilities (90th percentile) Alvarion

Nov. 2008 Mean Throughputs Alvarion

Nov. 2008 Median Throughputs Alvarion

Conclusions Hidden nodes Data throughput Nov. 2008 Conclusions Hidden nodes CX-CBP drastically improves the hidden-nodes situation for co-located 802.11 and 802.16 802.16 up-link is most affected by hidden nodes Synchronization can improve the situation Data throughput 802.11 DL throughput is most affected by interference CX-CBP improve the coexistence For inter-BS distances lower than 1.5-2km, sync. CX-CBP performs better At longer distances un-sync. CX-CBP should be preferred Alvarion