General
Multi antenna solutions:
- 3GPP release 10 (LTE advanced) is fulfilling the requirements
for IMT-advanced aka 4G
- Support for 1Gbps in down-link and 500Mbps in the up-link.
- Increased transmission bandwidth up to 100Mhz.
- AT&T plans to be the first NW to launch LTE-Advanced in 2013.
Wider bandwidth and carrier aggregation:
- To reach the peak data rates that are planned for LTE advanced, increased transmission bandwidth is necessary.
- Carrier aggregation provides increased bandwidth on adjacent channels. However, LTE advanced is also aiming for spectrum aggregation which may fully utilize non adjacent spectrum fragments from same or different bands although this is considered to be a highly complex procedure that will only be implemented in the most advanced (and expensive systems).
- Spatial multiplexing for up-link will be supported in LTE advanced.
- Down-link spatial multiplexing will be extended with up to 8 layers.
Advanced repeaters and relaying:
- Different relaying systems and repeaters may be utilized to increase
the SNR to the levels that are necessary for high bit rates transmission.
A wide range of implementations are envisioned ranging from low-cost,
low-complexity systems to advanced solutions that can be seen as miniature
base-stations known as “home nodeB’s” or femto-cells
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