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What is the role of RRC layer in lte protocol stack?

+2 votes

At broad level what could be the possible role of RRC layer in LTE/UMTS and does it really necessary for LTE protocol stack?

posted Sep 29, 2014 by anonymous

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2 Answers

+1 vote

The RRC protocol supports the transfer of common NAS information (i.e. NAS informationwhich is applicable to all UEs) as well as dedicated NAS information (which is applicableonly to a specific UE). In addition, for UEs in RRC_IDLE, RRC supports notification of incoming calls.

The RRC protocol covers a number of functional areas.

System information handles the broadcasting of system information, which includesNAS common information. Some of the system information is applicable only forUEs in RRC_IDLE while other system information is also applicable for UEs inRRC_CONNECTED.

RRC connection control covers all procedures related to the establishment, modificationand release of an RRC connection, including paging, initial security activation,establishment of Signalling Radio Bearers (SRBs) and of radio bearers carrying userdata (Data Radio Bearers, DRBs), handoverwithin LTE (including transfer of UE RRCcontext information4), configuration of the lower protocol layers,5 access class barring
and radio link failure.

Network controlled inter-RAT mobility includes (besides the mobility procedures)security activation and transfer of UE RRC context information.

Measurement configuration and reporting for intra-frequency, inter-frequency andinter-RAT mobility, includes configuration and activation of measurement gaps.

Miscellaneous functions including, for example, transfer of dedicated NAS informationand transfer of UE radio access capability information

And RRC plays very important role in control protocol stack as it handles connection of a UE to eNodeB.

answer Sep 29, 2014 by Aarti Jain
0 votes

In short RRC protocol is responsible for control plane signalling between UE and eNodeB (both UE as well as eNodeB have RRC protocol)

Major messages of RRC layer
1. RRC Connection Request
2. RRC Connection Setup
3. RRC Connection Setup Complete
4. RRC Connection Reconfiguration
5. RRC Connection Reconfiguration Complete.

This list is not complete may be someone can write an article on RRC layer summary.

answer Sep 29, 2014 by Salil Agrawal
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+3 votes

What is the functionality of RRC layer in LTE and how it is different from UMTS.

+2 votes


I recently started career with LTE technlogy and as a part of it I am working on RRC layer. So I want to know what exactly we have to get thorugh when we are working with RRC layer.?

Please let me know in case if I should explore my question in more detailed.

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Suppose a macro eNodeB supports multiple cells. Does each cell has its own instance for each layer or one instance of each protocol layer can handle more than one cell ?

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