Uplink Load Based Scheduling for CDMA Systems

Cellular third-generation wideband code division multiple access (WCDMA) systems must meet interference constraints to maintain coverage when uplink traffic is scheduled. The interference constraints can be expressed in the form of load factor constraints but current scheduling algorithms are typically not formulated in terms of these variables. The current paper shows how a cost function for the scheduling problem can be expressed directly in terms of load factors. A near optimal solution is developed for the resulting problem.

[1]  Z. Gajic,et al.  SIGNAL-TO-INTERFERENCE-BASED POWER CONTROL FOR WIRELESS NETWORKS : A SURVEY , 1992 – 2005 1 , 2005 .

[2]  Seong-Jun Oh,et al.  Optimal Resource Allocation for Data Service in CDMA Reverse Link , 2007, IEEE Trans. Wirel. Commun..

[3]  Seong-Jun Oh,et al.  Adaptive resource allocation in power constrained CDMA mobile networks , 1999, WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466).

[4]  P. Godlewski,et al.  Auto-interference analysis in cellular systems , 1999, 1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).

[5]  Fredrik Gustafsson,et al.  Control Theory Aspects of Power Control in UMTS , 2003 .

[6]  Vincent K. N. Lau,et al.  Performance analysis of SIMO space-time scheduling with convex utility function: zero-forcing linear processing , 2004, IEEE Transactions on Vehicular Technology.

[7]  Zhisheng Niu,et al.  A channel-adaptive and throughput-efficient scheduling scheme in voice/data DS-CDMA networks with constrained transmission power , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[8]  Lijun Qian,et al.  Uplink Scheduling in CDMA Packet-Data Systems , 2006, Wirel. Networks.

[9]  Seong-Jun Oh,et al.  Optimal resource allocation in multiservice CDMA networks , 2003, IEEE Trans. Wirel. Commun..

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

[11]  Seong-Jun Oh,et al.  Optimality of greedy power control and variable spreading gain in multi-class CDMA mobile networks , 1999, MobiCom.

[12]  Graham C. Goodwin,et al.  Linear and Nonlinear Decoupling for Inner Loop Power Control in 3G Mobile Communications , 2011 .

[13]  Torbjörn Wigren,et al.  WCDMA Uplink Load Estimation With Generalized Rake Receivers , 2012, IEEE Transactions on Vehicular Technology.

[14]  Erik Dahlman,et al.  3G Evolution: HSPA and LTE for Mobile Broadband , 2007 .