Policy Driven Scheduling to Provide Differentiated QoS for Delay Sensitive Services in HSDPA

Increasing demand for high data-rate multimedia real time services has led to the use of asynchronous time shared channels in the forward link for real-time services in 3G wireless networks, such as HSDPA, EV-DO and EV-DV. While network service providers would like to impose operational policies on the packet schedulers based on QoS requirements by real-time services to maximize profit, existing schedulers are not capable to deal with such challenge due to time varying channel conditions and constraints on the total forward link transmit power. In this paper, we consider the problem of scheduling users on the forward link in a multiuser system where multiple users can be scheduled during each interval. We introduce a delay aware policy driven scheduling algorithm SPS-Delay (Strict Policy Scheduling for Delay) to support differentiated QoS requirements in the form of tolerable latency specified by the user applications. We developed an HSDPA system in OPNET, and implemented our scheduling algorithm along with other well- known algorithms. Our simulations show that SPS-Delay reduces packet drop rate by as much as 80% and increases the number of satisfied users by as much as 32% when compared to PF.

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

[2]  Ness B. Shroff,et al.  A framework for opportunistic scheduling in wireless networks , 2003, Comput. Networks.

[3]  Raymond Knopp,et al.  Information capacity and power control in single-cell multiuser communications , 1995, Proceedings IEEE International Conference on Communications ICC '95.

[4]  Frank Frederiksen,et al.  Performance aspects of WCDMA systems with high speed downlink packet access (HSDPA) , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[5]  P. Hosein.  Scheduling of VoIP traffic over a time-shared wireless packet data channel , 2005, 2005 IEEE International Conference on Personal Wireless Communications, 2005. ICPWC 2005..

[6]  A.J. Paulraj,et al.  Multiuser diversity for MIMO wireless systems with linear receivers , 2001, Conference Record of Thirty-Fifth Asilomar Conference on Signals, Systems and Computers (Cat.No.01CH37256).

[7]  Hyeong-Ah Choi,et al.  Integrating admission control and packet scheduling for quality controlled streaming services in HSDPA networks , 2007, 2007 Fourth International Conference on Broadband Communications, Networks and Systems (BROADNETS '07).

[8]  Troels Emil Kolding.  Link and system performance aspects of proportional fair scheduling in WCDMA/HSDPA , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[9]  Mira Yun,et al.  Scheduling Algorithms For Policy Driven QoS Support in HSDPA Networks , 2007, 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring.

[10]  Frank Frederiksen,et al.  Performance and modeling of WCDMA/HSDPA transmission/H-ARQ schemes , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[11]  Kwang Bok Lee,et al.  Antenna-assisted round robin scheduling for MIMO cellular systems , 2003, IEEE Communications Letters.

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