Joint uplink and downlink capacity considerations in admission control in multiservice CDMA/HSDPA systems

TCP-based data flows generate packets and ACKs in two directions, be it in the wireline or wireless networks. In the latter case, packets are typically found in the downlink whereas ACKs are in the uplink. Those two links are asymmetric in the case of CDMA-based High Data Rate (HDR)/High-Speed Downlink Packet Access (HSDPA) systems, the uplink being much slower than the downlink and thus, in some cases, restrictive in terms of the achievable throughput of the TCP flow. The aim of this work is to evaluate the performance of such a setting, in the presence of both streaming and elastic traffic, under a dynamic scenario where users arrive to the system and leave it after completion of their service. We specifically quantify the impact of the uplink on the overall performance of TCP and study the model variations according to several parameters such as load, file size and radio conditions.

[1]  Michael Luby,et al.  LT codes , 2002, The 43rd Annual IEEE Symposium on Foundations of Computer Science, 2002. Proceedings..

[2]  Matthew S. Grob,et al.  CDMA/HDR: a bandwidth-efficient high-speed wireless data service for nomadic users , 2000, IEEE Commun. Mag..

[3]  T. V. Lakshman,et al.  TCP/IP performance with random loss and bidirectional congestion , 2000, TNET.

[4]  Daniel Kofman,et al.  Call admission control in the presence of point-to-multipoint best effort connections , 1999, 1999 IEEE International Conference on Communications (Cat. No. 99CH36311).

[5]  Antti Toskala,et al.  Wcdma for Umts , 2002 .

[6]  Wha Sook Jeon,et al.  Call admission control for mobile multimedia communications with traffic asymmetry between uplink and downlink , 2001, IEEE Trans. Veh. Technol..

[7]  Eitan Altman,et al.  Capacity of Multiservice WCDMA Networks with Variable GoS , 2006, Wirel. Networks.

[8]  Eitan Altman,et al.  Capacity of multi-service cellular networks with transmission-rate control: a queueing analysis , 2002, MobiCom '02.

[9]  Alexandre Proutière,et al.  Wireless downlink data channels: user performance and cell dimensioning , 2003, MobiCom '03.

[10]  Tijani Chahed,et al.  Cross-Layer Modeling of Capacity of UMTS/HSDPA Networks Under Dynamic User Setting , 2006, IEEE Vehicular Technology Conference.

[11]  Tijani Chahed,et al.  Mobility-Aware Admission Control Schemes in the Downlink of Third-Generation Wireless Systems , 2007, IEEE Transactions on Vehicular Technology.

[12]  Marcel F. Neuts,et al.  Matrix-Geometric Solutions in Stochastic Models , 1981 .

[13]  J. Laiho-Steffens,et al.  Estimation of capacity and required transmission power of WCDMA downlink based on a downlink pole equation , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).