Modified Queue-Based Exponential Rule Scheduler for Improved QOS in OFDMA Systems

In our paper, we propose a modification of queue based exponential scheduler that dynamically improves the channel gain of far away users (by increasing their credits) at the cost of a small reduction of the same for the nearby users(by reducing the credits), since users nearby anyway have a fairly high gain. Results clearly suggest that the proposed method is able to maintain a constant average throughput(always greater than that of the P.F scheduling) while it far outperforms the P.F and Queue- Based Exponential Rule Scheduler in the delay characteristics. The throughput fairness index was interestingly observed to improve with increasing number of users while it worsens for the other two schemes.

[1]  Matthew Andrews,et al.  Providing quality of service over a shared wireless link , 2001, IEEE Commun. Mag..

[2]  Pablo Jose Ameigeiras Gutiérrez,et al.  Packet Scheduling and Quality of Service in HSDPA , 2003 .

[3]  Philip A. Whiting,et al.  Dynamic bandwidth allocation algorithms for high-speed data wireless networks , 1998, Bell Labs Technical Journal.

[4]  Ion Stoica,et al.  Packet fair queueing algorithms for wireless networks with location-dependent errors , 1998, Proceedings. IEEE INFOCOM '98, the Conference on Computer Communications. Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies. Gateway to the 21st Century (Cat. No.98.

[5]  Michael Paterakis,et al.  Scheduling with QoS Support for MultiRate Wireless Systems with Variable Channel Conditions , 2006 .

[6]  R. Srikant,et al.  Fair scheduling in wireless packet networks , 1999, TNET.

[7]  Ness B. Shroff,et al.  Opportunistic transmission scheduling with resource-sharing constraints in wireless networks , 2001, IEEE J. Sel. Areas Commun..

[8]  Alexander L. Stolyar,et al.  Scheduling algorithms for a mixture of real-time and non-real-time data in HDR , 2001 .

[9]  Jack M. Holtzman,et al.  Asymptotic analysis of proportional fair algorithm , 2001, 12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598).

[10]  Ming-Chi Chen,et al.  Comparisons of link adaptation based scheduling algorithms for the WCDMA system with high speed downlink packet access , 2004, 2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring (IEEE Cat. No.04CH37514).

[11]  Youngnam Han,et al.  QoS-based adaptive scheduling for a mixed service in HDR system , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[12]  Frank Kelly,et al.  Charging and rate control for elastic traffic , 1997, Eur. Trans. Telecommun..

[13]  Rauf Izmailov,et al.  Non-real-time content scheduling algorithms for wireless data networks , 2006, IEEE Transactions on Computers.

[14]  Parameswaran Ramanathan,et al.  Adapting packet fair queueing algorithms to wireless networks , 1998, MobiCom '98.