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3GPP TS 25.331 version 12.3.0 Release 12<br />

143<br />

ETSI TS 125 331 V12.3.0 (2014-10)<br />

8.1.7 UE capability enquiry<br />

UE<br />

UTRAN<br />

UE CAPABILITY ENQUIRY<br />

Figure 8.1.7-1: UE capability enquiry procedure, normal flow<br />

8.1.7.1 General<br />

The UE capability enquiry can be used to request the UE to transmit i<strong>ts</strong> capability information related to any radio<br />

access network that is supported by the UE.<br />

8.1.7.2 Initiation<br />

The UE capability enquiry procedure is initiated by the UTRAN by transmitting a UE CAPABILITY ENQUIRY<br />

message on the DCCH using UM or AM RLC.<br />

8.1.7.3 Reception of a UE CAPABILITY ENQUIRY message by the UE<br />

Upon reception of a UE CAPABILITY ENQUIRY message, the UE shall act on the received information elemen<strong>ts</strong> as<br />

specified in subclause 8.6 and initiate the transmission of UE capability information procedure, which is specified in<br />

subclause 8.1.6.<br />

8.1.7.4 Invalid UE CAPABILITY ENQUIRY message<br />

If the UE receives a UE CAPABILITY ENQUIRY message, which contains a protocol error causing the variable<br />

PROTOCOL_ERROR_REJECT to be set to TRUE according to clause 9, the UE shall perform procedure specific error<br />

handling as follows:<br />

1> transmit an RRC STATUS message on the uplink DCCH using AM RLC;<br />

1> include the IE "Identification of received message"; and<br />

1> set the IE "Received message type" to UE CAPABILITY ENQUIRY; and<br />

1> set the IE "RRC transaction identifier" to the value of "RRC transaction identifier" in the entry for the UE<br />

CAPABILITY ENQUIRY message in the table "Rejected transactions" in the variable TRANSACTIONS; and<br />

1> clear that entry;<br />

1> include the IE "Protocol error information" with conten<strong>ts</strong> set to the value of the variable<br />

PROTOCOL_ERROR_INFORMATION;<br />

1> when the RRC STATUS message has been submitted to lower layers for transmission:<br />

2> continue with the ongoing processes and procedures as if the invalid UE CAPABILITY ENQUIRY message<br />

has not been received.<br />

ETSI

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