CX-CBP in 3.65GHz – Simulation results for overloaded systems March 2009 CX-CBP in 3.65GHz – Simulation results for overloaded systems Date: 06-03-2009 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 March 2009 802.16h CX-CBP – Frame structure CX-Frame structure is shown below: Alvarion

CX-CBP General features March 2009 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 March 2009 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

March 2009 Parameters Based on: IEEE 802.19-07/11r16, Parameters for simulation of Wireless Coexistence in the US 3.65GHz band Scenario A “Outdoor-to-outdoor” Scenario C “Outdoor-to-indoor” 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): Scenario A 802.16 DL: 7.2 Mbps 802.16 UL: 4 Mbps 802.11 overall: 8 Mbps Scenario C 802.16 DL: 2.4 Mbps 802.16 UL: 2.2 Mbps 802.11 overall: 3.1 Mbps Alvarion

March 2009 Parameters (cont.) 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 For scenario A, Simulation 1 uses 50% higher load than 9.6Mb/s in the parameters document. The load is equivalent with a spectral efficiency of 3bit/s/Hz, including the cell margin! For scenario C, the mandatory load of 9.6 Mbps used in Simulation 2 is more than 100% of the achievable load (7.7 Mbps) Alvarion

Legend Abbreviations NCX: No Coexistence Protocol March 2009 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

Cell sizes (Scenario A) March 2009 Cell sizes (Scenario A) Cell size for each system was chosen to be the minimum between its DL and UL ranges. Alvarion

Cell sizes (Scenario C) March 2009 Cell sizes (Scenario C) 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 March 2009 Simulation #1 Scenario A (outdoor to outdoor) 10 users per system Total offered load for both systems: 14.6 Mbps (stressed load) 802.16 offered load of 8.6 Mbps 570 Kbps DL per user 300 Kbps UL per user 802.11 offered load of 6 Mbps 400 Kbps DL per user 200 Kbps UL per user 5 MHz bandwidth Unlimited retransmissions in 802.11 and 802.16 Alvarion

Hidden Node Probabilities (Mean) March 2009 Hidden Node Probabilities (Mean) Alvarion

Hidden Node Probabilities (10th percentile) March 2009 Hidden Node Probabilities (10th percentile) Alvarion

Hidden Node Probabilities (Median) March 2009 Hidden Node Probabilities (Median) Alvarion

Hidden Node Probabilities (90th percentile) March 2009 Hidden Node Probabilities (90th percentile) Alvarion

March 2009 Mean Throughputs Alvarion

March 2009 Median Throughputs Alvarion

Simulation #2 Scenario C (outdoor to indoor) 10 users per system March 2009 Simulation #2 Scenario C (outdoor to indoor) 10 users per system Total offered load for both systems: 9.6 Mbps (stressed load) 802.16 offered load of 5.8 Mbps 300 Kbps DL per user 280 Kbps UL per user 802.11 offered load of 3.8 Mbps 260 Kbps DL per user 120 Kbps UL per user 5 MHz bandwidth Unlimited retransmissions in 802.11 and 802.16 Alvarion

Hidden Node Probabilities (Mean) March 2009 Hidden Node Probabilities (Mean) Alvarion

Hidden Node Probabilities (10th percentile) March 2009 Hidden Node Probabilities (10th percentile) Alvarion

Hidden Node Probabilities (Median) March 2009 Hidden Node Probabilities (Median) Alvarion

Hidden Node Probabilities (90th percentile) March 2009 Hidden Node Probabilities (90th percentile) Alvarion

March 2009 Mean Throughputs Alvarion

10th Percentile Throughputs March 2009 10th Percentile Throughputs Alvarion

March 2009 Conclusions At high load, SCX allows 802.11 to operate at separation distances lower than aprox. 1 km for Scenario 1 and 100m for Scenario C Hidden Node statistics is improved by SCX for 802.11y DL and 802.16h UL, as compared with NCX SCX and UCX significantly improve the 802.11y DL throughput, for separation distances lower than 2km in Scenario A and equivalent with the cell size in Scenario C Both SCX and UCX improve the 802.16h UL latency, as compared with NCX Alvarion