CPICH Ec/Io measurement report mapping

RRC Connection Request and some Measurement Report message carries the CPICH measured value as follows. But the value itself is not a dB or dBm value. There is a predefined table that maps this value to the real dBm value.

    +-rrcConnectionRequest ::= SEQUENCE [11]

      +-initialUE-Identity ::= CHOICE [tmsi-and-LAI]

      +-establishmentCause ::= ENUMERATED [registration]

      +-protocolErrorIndicator ::= ENUMERATED [noError]

      +-measuredResultsOnRACH ::= SEQUENCE [0] OPTIONAL:Exist

      | +-currentCell ::= SEQUENCE

      | | +-modeSpecificInfo ::= CHOICE [fdd]

      | |   +-fdd ::= SEQUENCE

      | |     +-measurementQuantity ::= CHOICE [cpich-Ec-N0]

      | |       +-cpich-Ec-N0 ::= INTEGER (0..63) [41]

Following table comes from 3GPP 25.133.