In recent years, mobile communication has evolved rapidly and demand for mobile devices with new and higher quality services is increasing. The existing 3G standard, Universal Mobile Telecommunication System (UMTS), is currently being upgraded with High Speed Packet Access (HSPA) to meet current demands. However, in the longer term this will not be sufficient.
The 3rd Generation Partnership Project (3GPP) has investigated the long term evolution of UMTS (LTE) to meet future demands and ensure the competitiveness of the standard. The objective is a radio access technology with higher data rates, lower latencies and optimal support for packet services such as multimedia, games and internet services. Telephony should be supported by means of Voice over IP (VoIP) with at least as good quality as circuit switched telephony.
This thesis will cover the technology and architecture of LTE. The focus is on Evolved Universal Terrestrial Radio Access (E-UTRA) Layer 2 functionality and a proof of concept LTE system. The purpose is to demonstrate how user plane traffic is transferred through the system. The specifications of LTE are not yet finalized. Therefore, the implementation is based on work in progress specifications and meeting protocols from 3GPP work groups.
The prototype resulted in a system capable of handling multiple user equipments with streams in both uplink and downlink. In Layer 2, the prototype has a complete implementation of user plane data transfer in unacknowledged mode, featuring segmentation, concatenation and multiplexing. The prototype also supports retransmissions and basic scheduling.
Author: Hagstrand, Jesper; Karlsson, Par; Silverplats, Olle
Source: Lulea University of Technology
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