Selection of DRX scheme for voice traffic in LTE-A networks: Markov modeling and performance analysis

Anupam Gautam,Selvamuthu Dharmaraja

doi:10.3934/jimo.2018068

Abstract

Power saving is a leading issue in the User Equipment (UE) for limited source of power in Long Term Evolution-Advanced (LTE-A) networks. Battery power of an UE gets exhaust quickly due to the heavy use of many service applications and large data transmission. Discontinuous reception (DRX) is a mechanism used for power saving in UE in the LTE-A networks. There are scope of improvements in conventional DRX scheme in LTE-A networks for voice communication. In this paper, a DRX scheme is chosen by selecting optimal parameters of DRX scheme, while keeping Quality of Service (QoS) delay requirements. Further, delay analysis for first downlink packet is performed. Moreover, expressions for delay distribution and expected delay of any downlink packet, are obtained and represented graphically. Based on analytical model, the trade-off relationship between the power saving and queueing delay is investigated.

Highlights

The Fourth Generation (4G) emerging wireless technologies, such as Long Term Evolution-Advanced (LTE-A) and Worldwide Interoperability for Microwave Access (WiMAX) endeavour a high bandwidth and wide coverage of area for data transfer [20, 14]
An DRX scheme is obtained by exploiting characteristics of voice traffic
Performance analysis is presented for an User Equipment (UE) with voice traffic service in two-way communication in LTE-A networks

Summary

Introduction

The Fourth Generation (4G) emerging wireless technologies, such as Long Term Evolution-Advanced (LTE-A) and Worldwide Interoperability for Microwave Access (WiMAX) endeavour a high bandwidth and wide coverage of area for data transfer [20, 14]. Long term evolution-advanced (LTE-A) networks, Brady model for voice traffic, discontinuous reception (DRX), continuous time Markov chain (CTMC), power saving, delay. Utilizing the properties of voice traffic lead us to select optimal parameters of DRX scheme which gives more power saving over conventional DRX schemes in LTE-A networks. The working of UE receiver during inactivity timer period, short DRX cycle and long DRX cycle in conventional DRX scheme is given as the following: Inactivity timer is the pre-determined time period for which UE waits before going into sleep mode if there is no packet arrival before inactivity timer period is expired. A positive inactivity timer period is not required and we set inactivity timer period equals to zero for this model These DRX parameters are selected based on the applications type such as power, resource savings maximization and traffic considered.

B Talks and A is Silent

Findings

Conclusion and future work