11.5 Summary
ITU defined performance targets for IMT-Advanced technologies in terms of peak data rates, average efficiency and cell edge efficiency in multiple different propagation environments. Also 3GPP defined its own performance targets for LTE-Advanced. This chapter illustrated the targets and the corresponding simulation results in 3GPP. LTE-Advanced can improve performance because of new features in spatial domain, time domain and frequency domain which enhance the system performance in case of multiantennas, heterogeneous networks and wideband systems. The result of the system simulations is that LTE-Advanced in Release 10 exceeds all ITU and 3GPP performance requirements. LTE-Advanced spectral efficiency is improved compared to Release 8 especially in multiantenna cases with 4 × 2 and 4 × 4 MIMO transmission. The macro cell spectral efficiency is up to 4.7 bps/Hz/cell with 4 × 4 MIMO corresponding to nearly 200 Mbps average efficiency with 40 MHz bandwidth.
The network level dimensioning shows that typical operator spectrum allocations with existing base station density and with LTE-Advanced efficiency can provide over 10 GB data for every subscriber per month. By macrocell sectorization, heterogeneous networks and new spectrum allocations enable even more than 100 GB data per month. In many cases the data rates are limited by the coverage, which likely requires new base stations to deliver the required link budgets.
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