A novel approach to smart multi-cell radio resource management based on load gradient calculations

This paper presents a novel methodology for capturing the coupling between the different cells in both the uplink and downlink directions in a Wideband Code Division Multiple Access (WCDMA) scenario. It is based on the definition and computation of the gradient of the uplink cell load factor and the downlink transmitted power, which are the two main parameters that reflect the actual cell load in the two link directions. The paper shows that the gradient is able to capture the relevant information about the spatial distribution of traffic, which has an impact on cell performance. The proposed methodology is also used as the basis for defining and evaluating new Radio Resource Management (RRM) strategies that operate at a multi-cell level.

[1]  Magnus Persson,et al.  Downlink admission control strategies for CDMA systems in a Manhattan environment , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[2]  W. Rave,et al.  Evaluation of load control strategies in an UTRA/FDD network , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[3]  Paul M. Mather,et al.  Convergence Technologies for 3G Networks , 2003 .

[4]  Antonio Capone,et al.  Received power based call admission control techniques for UMTS uplink , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[5]  Joan J. Olmos,et al.  Transport block error rates for UTRA-FDD downlink with transmission diversity and turbo coding , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[6]  Andrew J. Viterbi,et al.  Other-cell interference in cellular power-controlled CDMA , 1994, IEEE Trans. Commun..

[7]  Zhao Liu,et al.  SIR-based call admission control for DS-CDMA cellular systems , 1994, IEEE J. Sel. Areas Commun..

[8]  William Stallings.  Wireless Communications and Networks , 2001 .

[9]  P. Mermelstein,et al.  Call admission on the uplink and downlink of a CDMA system based on total received and transmitted powers , 2004, IEEE Transactions on Wireless Communications.

[10]  Philippe Godlewski,et al.  Admission control strategy and scheduling algorithms for downlink packet transmission in WCDMA , 2000, Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152).

[11]  Rahim Tafazolli,et al.  Call admission policies for UMTS , 2000 .

[12]  Terhi Rautiainen.  Breaking the hierarchical cell structure in WCDMA networks , 2002, Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367).

[13]  Simone Redana,et al.  Call admission control techniques for UMTS , 2001, IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211).

[14]  Fredrik Gustafsson,et al.  Uplink load estimation in WCDMA , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[15]  Fredrik Gunnarsson,et al.  Uplink admission control in WCDMA based on relative load estimates , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[16]  Leonardo Badia,et al.  On the impact of user mobility on call admission control in WCDMA systems , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[17]  Rudolf Tanner,et al.  WCDMA - Requirements and Practical Design: Tanner/WCDMA , 2005 .

[18]  Nikos Passas,et al.  A graceful degradation method for congestion control in wireless personal communication networks , 1996, Proceedings of Vehicular Technology Conference - VTC.

[19]  Gordon L. Stüber,et al.  On call admission control in DS/CDMA cellular networks , 2001, IEEE Trans. Veh. Technol..

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

[21]  Harri Holma,et al.  Uplink admission control and soft capacity with MUD in CDMA , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[22]  Te-Kai Liu,et al.  Joint admission/congestion control for wireless CDMA systems supporting integrated services , 1998, IEEE J. Sel. Areas Commun..

[23]  Oriol Sallent,et al.  Provisioning multimedia wireless networks for better QoS: RRM strategies for 3G W-CDMA , 2003, IEEE Commun. Mag..

[24]  J. Perez-Romero,et al.  Optimizing statistical uplink admission control for W-CDMA , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[25]  Andrew J. Viterbi,et al.  On the capacity of a cellular CDMA system , 1991 .

[26]  Antti Toskala,et al.  WCDMA for UMTS: Radio Access for Third Generation Mobile Communications , 2000 .

[27]  Klaus I. Pedersen,et al.  Multi-cell admission control for UMTS , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[28]  R. Agustí,et al.  Managing radio network congestion in UTRA-FDD , 2002 .

[29]  R. De Bernardi,et al.  Load control strategies for mixed services in WCDMA , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).