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What is the need for UE capability to both eNodeB and MME?

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What is the need for UE capability to both eNodeB and MME?
posted Aug 15, 2014 by anonymous

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1 Answer

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Majorly, UE capability can be divided into following two categories:
Access Stratum Capability:
- The capability information on which eNodeB takes decision for an UE.
In radio capablity, UE tells its category, supported ROHC profile, rf parameters, supported bands (like band7, band1 etc), measurement capability, Feature Group Indicator etc.

Non-Access Stratum Capability:
- The capability information on which MME/Network takes decision for an UE. In the NAS-capability, UE informs to MME about its supported algorithm.

answer Aug 15, 2014 by Vimal Kumar Mishra
How does eNB get to know all these informations of UE? The ueCapabilityInformation is completely a (dedicated) NAS message.
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+1 vote

why does MME need the "UE Radio Capability" information for an UE during attach procedure ?

+4 votes

There are couple of procedures are defined which consist of NAS as well as RRC signalling messages exchange.
Some of the NAS message sends to an UE through RRC Connection Reconfiguration message as piggybacked and some as DL Info transfer.

I want to know, Is there any procedure exists in lte when an UE receives RRC Connection Reconfiguration along with NAS message and responds back to network with NAS message first and then Reconfiguration Complete to eNodeB.

Usually, I saw UE sends RRC Connection Reconfiguration Complete message first then NAS response message.

+3 votes

EnodeB considers CQI feedback from the UE before creating the transport block.
As per my understanding PUCCH resource allocation is not very dynamic. In this case how UE decide to use a specific MCS (Modulation and Coding Scheme) while using PUCCH channel ?

+4 votes

I saw a scenario where an Identity is requested by MME after successful Authentication and Security mode complete.. As a Response to this message UE is Sending IMEI? what is the need of checking IMEI number after successful authentication? If IMEI is in block list then ongoing Attach procedure is going to be Terminate...? Identity Request intention is mainly to check the IMEI belongs to any one of Black, while or Green list then why cannt MME check for this before Security Mode?

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