11.2 LTE-Advanced Targets

ITU set performance targets for IMT-Advanced in [1]. IMT-Advanced systems need to support very high data rates in local area, and high mobility and flexibility for multiple services. The peak spectral efficiency in downlink with 4 × 4 MIMO must be 15 bps/Hz and in uplink with 2 × 4 MIMO 6.75 bps/Hz. The bandwidth must be scalable up to 40 MHz and preferably up to 100 MHz. The peak data rate would be 1.5 Gbps in downlink and 675 Mbps in uplink with 100 MHz. ITU also defined the latency requirements: control plane latency from idle to active must be below 100 ms and one way user plane latency below 10 ms. The handover break must be less than 27.5 ms for intra-frequency handover and below 60 ms for inter-band handover.

The cell spectral efficiency target is defined both for average case and for the cell edge case. The cell edge is defined as the 5% point of the cumulative distribution function of the user throughputs. The capacity for Voice over IP (VoIP) is defined per MHz with 50% voice activity and with the maximum one way radio access delay of 50 ms. VoIP capacity is the minimum value of uplink and downlink capacity. The antenna configuration assumes two antennas in the terminal and four antennas at base station, downlink 4 × 2 and uplink 2 × 4. ITU requirements for average and cell edge efficiency in downlink are shown in Table 11.1 and for uplink in Table 11.2. Four different environments are used: indoor, microcells, urban macro coverage and high speed ...

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