LTE: UE Capability Information

Direction: UE => E-UTRAN
Signalling Radio Bearer: SRB1
RLC Mode: AM
Logical Channel: DCCH
Transport Channel: UL-SCH

The UE CAPABILITY INFORMATION message is used to transfer of UE radio access capabilities requested by the E-UTRAN in UE CAPABILITY ENQUIRY.

ueCapabilityRAT-Container is the container for the UE capabilities of the indicated RAT. The encoding is defined in the specification of each RAT. For E-UTRA, the encoding of UE capabilities is defined in the IE UE-EUTRA-Capability which is explained below

Some important parameters in UE-EUTRA-Capability IE are given below:

accessStratumRelease: Set to Rel8, Rel9, Rel10 and so on (based on the UE’s  release)

maxNumberROHC-ContextSessions: Set to the maximum number of concurrently active ROHC contexts supported by the UE. cs2 corresponds with 2 (context sessions), cs4 corresponds with 4 and so on

ue-Category:  As per Rel10, the possible values are 1 to 8 (Ref: TS 36.306)

ue-TxAntennaSelectionSupported: TRUE indicates that the UE is capable of supporting UE transmit antenna selection as described in TS 36.213

halfDuplex: If halfDuplex is set to true, only half duplex operation is supported for the band, otherwise full duplex operation is supported. This entry is present in each of the supported bands

bandListEUTRA: One entry corresponding to each supported E-UTRA band listed in the same order as in supportedBandListEUTRA

interFreqBandList: One entry corresponding to each supported E-UTRA band listed in the same order as in supportedBandListEUTRA

interFreqNeedForGaps: Indicates need for measurement gaps when operating on the E-UTRA band given by the entry in bandListEUTRA and measuring on the E-UTRA band given by the entry in interFreqBandList

interRAT-BandList: One entry corresponding to each supported band of another RAT listed in the same order as in the interRAT-Parameters

interRAT-NeedForGaps: Indicates need for DL measurement gaps when operating on the E-UTRA band given by the entry in bandListEUTRA and measuring on the inter-RAT band given by the entry in the interRAT-BandList

SupportedBandUTRA-FDD: UTRA band as defined in TS 25.101

SupportedBandGERAN: GERAN band as defined in TS 45.005

featureGroupIndicators, featureGroupIndRel9Add, featureGroupIndRel10: These featureGroupIndicators IE is a bit string, where each bit indicate support for a specific feature. The definitions of the bits in the bit string are described in Annex B.1 (for featureGroupIndicators and featureGroupIndRel9Add) and in Annex C.1.(for featureGroupIndRel10) of 36.331

Example: UE CAPABILITY INFORMATION

Reference: 3GPP TS 36.331