This chapter presents the performance requirements of LTE. It contains practical interpretations of the standards' requirements and their effect on network planning, deployment and optimization, the effects of LTE and SAE on system interworking, handover procedures, and mixed user profiles, issues related to network synchronization and the Timing over Packet functionality.
4.2 LTE Key Features
4.2.1 Release 8
According to 3GPP, the LTE Release 8 Key Features are the following:
High spectral efficiency. This is accomplished via the OFDM in the downlink, making the system robust against multipath interference and providing high affinity to advanced techniques such as frequency domain channel-dependent scheduling and MIMO. In the uplink, DFTS-OFDM, or Single-Carrier FDMA, is used, which provides a low Peak-to-Average Power Ratio (PAPR) and user orthogonality in the frequency domain. It is also possible to use the multi-antenna application.
Very low latency means that there is a short setup time as well as short transfer delay. The handover latency and interruption time are short, as well as the TTI and RRC procedures. To support fast signaling, the RRC states are simply defined.
Support for variable bandwidth means that it is possible to define some of the following bands: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz.
Simple protocol architecture means that the communication is shared, channel based, and ...