What is Aggregation?:- In Layman language the meaning of Aggregation is formation of number of things into cluster.
Carrier Aggregation in LTE:- 3GPP in Rel10 standardizes LTE-Advanced in addressing to meeting the IMT Advanced requirements. LTE-Advanced involves a set of features and one of them is carrier aggregation. In carrier aggregation it combines multiple LTE system bands or carriers with different bandwidth (1.5, 3 , 5 , 10 , 15 , 20 MHz) , thus increasing the overall capacity and the overall network throughput. Each aggregated carrier is referred to as a component carrier (CC) and the release 10 specifies that a maximum of five CC can be aggregated, hence a maximum aggregated bandwidth of 100 MHz, which is shown below.
Carrier Aggregation scenario:- There are mainly 3 types of carrier aggregation depending on the component carriers.
1. Intra Band Contiguous(Continuos)
2. Intra Band Non Contiguous
3. Inter Band Non Contiguous
General Working Principal in Carrier Aggregation:- When carrier aggregation is used there are a number of serving cells, one for each component carrier. The coverage of the serving cells may differ, for example due to that CCs on different frequency bands will experience different pathloss. We have used only one carrier called primary carrier for coverage and all other carriers called secondary carriers are used for User data. The RRC connection is only handled by the Primary serving cell, Secondary serving cells,The SCCs are added and removed as required, while the PCC is only changed at handover.
Example: Suppose if we have 3 different Bands( 850,1800,2100MHZ) and we want to implement the CA(Carrier aggregation) then the principals as below:
The primary cells/carriers must be 850 as we have less pathloss and more coverage and other 2 we can used in secondary cells/carriers for user data.
Carrier Aggregation in LTE:- 3GPP in Rel10 standardizes LTE-Advanced in addressing to meeting the IMT Advanced requirements. LTE-Advanced involves a set of features and one of them is carrier aggregation. In carrier aggregation it combines multiple LTE system bands or carriers with different bandwidth (1.5, 3 , 5 , 10 , 15 , 20 MHz) , thus increasing the overall capacity and the overall network throughput. Each aggregated carrier is referred to as a component carrier (CC) and the release 10 specifies that a maximum of five CC can be aggregated, hence a maximum aggregated bandwidth of 100 MHz, which is shown below.
Carrier Aggregation scenario:- There are mainly 3 types of carrier aggregation depending on the component carriers.
1. Intra Band Contiguous(Continuos)
2. Intra Band Non Contiguous
3. Inter Band Non Contiguous
General Working Principal in Carrier Aggregation:- When carrier aggregation is used there are a number of serving cells, one for each component carrier. The coverage of the serving cells may differ, for example due to that CCs on different frequency bands will experience different pathloss. We have used only one carrier called primary carrier for coverage and all other carriers called secondary carriers are used for User data. The RRC connection is only handled by the Primary serving cell, Secondary serving cells,The SCCs are added and removed as required, while the PCC is only changed at handover.
Example: Suppose if we have 3 different Bands( 850,1800,2100MHZ) and we want to implement the CA(Carrier aggregation) then the principals as below:
The primary cells/carriers must be 850 as we have less pathloss and more coverage and other 2 we can used in secondary cells/carriers for user data.
Expecting more details on types of carrier aggregation.
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