A Modest Proposal

CHAPTER 1

INTRODUCTION

1.1 INTRODUCTION

As the demand for Packet based mobile broadband system is increasing day by day .So, to meet the needs of future mobile communication requirements, 3GPP(3rd Generation Partnership Project) has standardized a new technology which is the next step of current 3G mobile network i.e. LTE(Long Term Evolution) [15]. The main objective of LTE is to achieve high data rate, low latency radio access technology and to serve the challenges arising from the growing demand of network services like VoIP, video streaming, web browsing with constraints on delays and bandwidth requirements.

As LTE is all IP network technology, the requirements like high speed data rate, low latency, increased spectral efficiency, scalable bandwidth etc. can be fulfilled by selecting several key technologies for LTE radio interface. Of which, the most important technologies are multiple access through SCFDMA (Single Carrier Frequency Division Multiple Access) in uplink, OFDMA (Orthogonal

Packet scheduling mechanisms plays an important role, because they are responsible for selecting, with fine time and frequency resolutions, distribution of radio resources among different stations, considering the channel condition and QoS requirements.

This goal should be accomplished by providing an optimal trade-off between spectral efficiency and fairness. The downlink channel under frequency division duplex configuration is considered as an object of our study, but they are valid for other configurations also. A survey was also provided for complementing the above concepts on recent technique. Thus, this survey would be useful for the readers interested in learning the basic concepts. Performance comparison of the already available scheduling schemes with focus on QoS.

1.2.1 User