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Performance analysis and enhancements of radio resource control with applications to LTE advanced

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  1. Tez No: 401509
  2. Yazar: ALİ TAHA KOÇ
  3. Danışmanlar: PROF. MURAT TORLAK
  4. Tez Türü: Doktora
  5. Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2013
  8. Dil: İngilizce
  9. Üniversite: The University of Texas at Dallas
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 126

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Özet (Çeviri)

With all the developments and advances in wireless communications, we are faced with the challenge of securing scarce resources including frequency spectrum and device battery power. The objective of efficiently utilizing the scarce radio spectrum under acceptable delay and limited battery power has become even more challenging especially after the proliferation of smart phones. Scarce radio spectrum is utilized by radio resource control (RRC) which is the part of protocol stack in advanced wireless systems which handles signalling between user terminals and wireless networks. The configuration of RRC has significant impact on both efficient utilization of the spectrum and battery life. The radio resource control mechanisms in wireless networks include Automatic Repeat Request (ARQ) and Discontinuous Reception (DRX) operations. In this dissertation, we develop performance analysis techniques for ARQ over different channel conditions and explore analytical models for DRX mechanism in advanced wireless networks. ARQ is designed to improve the reliability of wireless networks under fading and collision via retransmitting erroneous packets. We first investigate the fading issues and present the system model for collision free ARQ systems to optimize the number of retransmissions. Statistical analysis of collision free ARQ systems rely on the product distributions of fading channels. Existing methods to evaluate the statistical properties of product distributions either use numerical approximation or special functions in the form of infinite series. We propose a simple and efficient analytical approximation to the probability distribution of product of independent random variables. We extend our analysis to ARQ collision channels with a unified approach for throughput calculation for both single antenna and multi antenna systems. An important part of radio resource control is device battery power saving. Discontinuous reception (DRX) is one of the key mechanisms used by current wireless networks. We present an analytical model for DRX mechanism as Semi-Markov process. Using this analytical model, tradeoff between power saving and latency of DRX mechanism is investigated. Findings are verified with analytical and simulation results over LTE advanced networks with mobile application traffic. Since the requirements of various mobile applications are getting more diverse, our analysis and corresponding algorithm development need to be tested under a variety of channel and network conditions. Thus, we present a common network simulation platform that implements realistic communication links and data traffic for advanced wireless systems.

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