tion resource partitions, each partition assignment should be considered as a separate packet transmission. The number of partitions, Npartition> the time constant of the filter used in the metric CHAPTER 6 The IEEE 802. 16m MAC CPS (Part I) computation, and number of active users are simulation parameters. At any scheduling instant t, the scheduling metric Mi(t) for subscriber used by the proportional fair scheduler is given by M.(1) (A6.1) where T_insti(t) is the data rate that can be supported at scheduling instant t for subscriber i, T_insti(t) is a function of the CQI feedback, and consequently of the modulation and coding scheme that can meet the Packet Error Rate (PER) requirement. The T_average;(t) denotes the throughput function smoothed by a low-pass filter at the scheduling instant t for user i. The parameter a is a fairness exponent factor with default value of one. For the scheduled subscriber, T_average;(t) is computed as: vesa1) (A6.2) and for an unscheduledsubscriber, (A6.3) The latency scale of the Proportional Fair scheduler, NPF, is given by: NPF = TprN partitions/Trame (A6.4) where TPF represents the latency time scale in units of seconds and TFrame is the frame duration of the system. In some implementations, the scheduler may give priority to HARQ re-transmissions. References [1] IEEE Std 802.16-2009, IEEE Standard for Local and Metropolitan Area Networks - - Part 16: Air Interface for Fixed Broadband Wireless Access Systems, May 2009. [2] P802.16m/D6, IEEE Standard for Local and Metropolitan Area Networks - Part 16: Air Interface for Broadband Wireless Access Systems, Advanced Air Interface, May 2010. [3] IEEE Std 802-2001, IEEE Standard for Local and Metropolitan Area Networks: Overview and Archi- tecture, February 2002. [4] IEEE Registration Authority <http://standards.ieee.org/regauth/index.html>. [5] IEEE 802.16m-0034r3, System Description Document, May 2010. [6] Loutfi Nuaymi, WiMAX: Technology for Broadband Wireless Access,, John Wiley & Sons, 2007. Jeffrey G. Andrews, Arunabha Ghosh,