LTE Carrier Aggregation documents

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FYI


LTE Advanced offers considerably higher data rates than even the initial releases of LTE. While the spectrum usage efficiency has been improved, this alone cannot provide the required data rates that are being headlined for 4G LTE Advanced.
To achieve these very high data rates it is necessary to increase the transmission bandwidths over that used by the first releases of LTE. The method being proposed is termed carrier aggregation or sometimes channel aggregation. Using LTE Advanced carrier aggregation, it is possible to utilise several carriers and in this way increase the overall transmission bandwidth.

LTE carrier aggregation basics

In order to provide the required data bandwidth, several carriers may be used in a process called carrier aggregation. Using this processes several carriers are aggregated on the physical layer to provide the required bandwidth.
To an LTE terminal, each component carrier appears as an LTE carrier, while an LTE-Advanced terminal can exploit the total aggregated bandwidth.
http://www.radio-electronics.com/info/cellulartelecomms/lte-long-term-evolution/lte-carrier-aggregation-01.gif
LTE Carrier Aggregation
LTE Advanced non-contiguous carrier aggregation

LTE may not have access to sufficient levels of contiguous spectrum to carry the required data using contiguous LTE carrier aggregation techniques.
Some new bands were identified for use by IMT / IMT Advanced technologies at the World Radio Conference in 2007. Possible bands included:


450-470 MHz
698-862 MHz
790-862 MHz
2.3-2.4 GHz
3.4-3.6 GHz

These allocations are not yet confirmed and they may not be available on a worldwide basis. Additionally the LTE bands may not be large enough in many countries to enable contiguous spectrum use. It is for this reason that non-contiguous LTE carrier aggregation work is on-going.
LTE Advanced carrier aggregation using non-contiguous spectrum, while possible is challenging in terms of its implementation. This means that even though LTE carrier aggregation using non-contiguous spectrum will be supported, it will be constrained and limited to a number of specific scenarios, and only supported by the most advanced terminals.