Resource Management for Hybrid 3.75G UMTS and 4G LTE Cellular Communications

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 253)

Abstract

The UMTS and LTE/LTE-Advanced specifications have been proposed to offer high data rate for the forwarding link under high-mobility wireless communications. The keys include supporting multi-modes of various coding schemes (e.g., VSF-OFCDM, OFDM, OFDMA), multiple-input multiple-output, relay networks, etc. To balance loads among different communication interfaces is one of the most important issues that should be addressed for achieving efficient radio resource allocations. In a shared packet service, the 3GPP UMTS adopts the VSF-OFCDM interface to allocate orthogonal codes of an OVSF code tree in two-dimension (2D) spreading of the time and frequency domains. Conversely, although the LTE/LTE-Advanced interface offers a high data rate, it suffers from unbalanced loads and moderate reward. This paper thus proposes an adaptive radio resource allocation for balancing loads between the UMTS and LTE/LTE-Advanced interfaces according to various interference and mobility environments. Additionally, an adaptive multi-code allocation is proposed for the UMTS to minimize the bandwidth waste rate while guaranteeing quality of service. Numerical results indicate that the proposed approach outperforms other approaches in fractional reward loss and system utilization.

Keywords

Adaptive radio resource management Adaptive modulation and coding Load balancing Resource block 2D-spreading Multiple input multiple output Multicode LTE-A 

Notes

Acknowledgments

This research was supported in part by the National Science Council of Taiwan, under the contracts of NSC-101-2221-E-252 -008, NSC-101-2221-E-224-021-MY2, and NSC-101-2221- E-224-022-MY3.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Department of Computer Science and Information EngineeringNational Yunlin University of Science and TechnologyDouliouTaiwan (People’s Republic of China)
  2. 2.Department of Multimedia Animation and ApplicationNan Kai University of TechnologyTianjinTaiwan (People’s Republic of China)

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