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What is the relation between primary, secondary and serving cells LTE?

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What is the relation between primary, secondary and serving cells LTE?
posted Oct 5, 2013 by Vimal Kumar Mishra

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can you explain the question in more detail ,are you asking regarding primary and secondary cells in case of carrier aggregation of lte advanced
Yes, I am looking for answer w.r.t to lte and lte-advanced both.
Primary Cell: the cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure, or the cell indicated as the primary cell in the handover procedure.
Secondary Cell: a cell, operating on a secondary frequency, which may be configured once an RRC connection is established and which may be used to provide additional radio resources.
Not sure about the serving cell.

1 Answer

+1 vote

Primary Cell: the cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure, or the cell indicated as the primary cell in the handover procedure.

Secondary Cell: a cell, operating on a secondary frequency, which may be configured once an RRC connection is established and which may be used to provide additional radio resources.
Not sure about the serving cell.

The RRC connection is only handled by one cell, the Primary serving cell, served by the Primary component carrier (DL and UL PCC). It is also on the DL PCC that the UE receives NAS information, such as security parameters. In idle mode the UE listens to system information on the DL PCC. On the UL PCC PUCCH is sent.
The other component carriers are all referred to as Secondary component carriers (DL and UL SCC), serving the Secondary serving cells.

For more detail check http://www.slideshare.net/Nidhi_Arora/carrier-aggregation-in-lteadvanced-17259749 page 5/6.

answer Oct 6, 2013 by Salil Agrawal
Similar Questions
+1 vote

Please give any example with scenario for making it more clear ....

+1 vote

An UE configured for carrier aggregation, may have different radio channel conditions for primary and secondary cells.
I meant to say, primary cell may have strong signal strength at the same time UE may observed secondary cell(s) not too good.
In this case, does the same modulation and coding schemes used for primary and secondary or may use different coding and modulation schemes for different channels for the same sub frame?

+1 vote

As i know UE can trigger RLF on PScell but can it trigger on secondary Scell .

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