pcc and scc
DESCRIPTION
PCC and SCCTRANSCRIPT
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http://4g-university.com
Our RRC spec is given the definition of primary and secondary cell as follows:
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.
So Primary cell corresponds to PCC and Secondary cell corresponds to SCC as you said in the
NOTE block.
If it so, then these two corresponds to cell/sector.
How they do not correspond to its sector/cell?
In 3gpp.org carrier aggregation is explained, a part of it as follows., 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.
Component carriers are different carriers of bandwidths of 1.4 or 3,5,10,15,20Mhz.
what exactly the PCC and SCC mean? How a protocol stack entity can serve different
component carriers?
Answer:
Imagine firstly, that you have a eNB with one antenna (one sector antenna). Then if you have
one carrier available (e.g. 20MHz) this antenna will be emitting signal over a certain area with
this single carrier. Then if you add second carrier (also e.g. 20MHz) that it will also be
transmitted over the same antenna and providing similar coverage on the same area (please see
the attached figure CA_example). One of this carrier is called and configured as PCC and any
other is called SCC. In case of protocol stack we have several copies of the PHY layers that
create in the baseband multiple component carriers. So this is the case when we have one
antenna and one sector (i.e. one protocol stack in which we have multiple PHY layers). If we
extend this example to the one when we have several antennas serving different areas (e.g. 3
sectors) we will have multiple protocol stacks (one for each sector).
PCC is a carrier that is used for all signalling purposes for communication with UE (for RRC
connection maintenance and NAS signalling) and for IP services. SCC is just the same type of
carrier that is used for different purpose simply it just enables to have more resources for IP traffic for UEs, but its not used for RRC/NAS signalling.
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