0th Vehicular Technology Conference, VTC2004-Fall, Vol. 1, September 2004; pp. 409-413. 32. Park, T., Shin, O. and Lee, K. Proportional fair scheduling for wireless communication with multiple transmit and receive antennas. IEEE 58th Vehicular Technology Conference, VTC2003-Fall, Vol. 3, October 2003; pp. 1573-1577. 262 Open Radio Access Network (O-RAN) Systems Architecture and Design 33. Shakkottai, S. and Srikant, R. Scheduling real-time traffic with deadlines over a wireless channel. Proceedings of the 2nd ACM International Workshop on Wireless Mobile Multimedia, August 1999; pp. 35-42. 34. Wang, H. S.; Moayeri, N. Finite-state Markov channel - a useful model for radio communication chan- nels. IEEE Transactions on Vehicular Technology 1995, 44 (1), 163-171 February 1995. 35. Yang, S.; Veciana, G. Enhancing both network and user performance for networks supporting best effort traffic. IEEE/ACM Transactions on Networking 2002, 12 (2), 349-360 April 2002. 36. Yaxin, C., Li, V. and Zhigang, C. Scheduling delay-sensitive and best-effort traffics in wireless networks. IEEE International Conference on Communications, 2003. ICC'03, Vol. 3, May 2003; pp. 2208-2212. 37. Wongthavarawat, K. and Ganz, A. IEEE 802.16 based last mile broadband wireless military networks with quality of service support. IEEE Military Communications Conference, 2003. MILCOM 2003, Vol. 2, October 2003; pp. 779-784. 38. Guosong, C., Wang, D. and Shunliang, M. A QoS architecture for the MAC protocol of IEEE 802.16 BWA systems. IEEE 2002 International Conference on Communications, Circuits and Systems and West Sino Expositions, Vol. 1, July 2002; pp. 435-439. 39. Lee, H., Kwon, T. and Cho, D.-H. An efficient uplink scheduling algorithm for VoIP services in IEEE 802.16 BWA systems. IEEE 60th Vehicular Technology Conference, VTC2004-Fall, Vol. 5, Issue 26-29, September 2004; pp. 3070-3074. 40. Kim, D.-H.; Ryu, B.-H.; Kang, C.-G. Packet scheduling algorithm considering a minimum bit rate for non-realtime traffic in an OFDMA/FDD-based mobile internet