This TS contains the description and definition of the measurements done at the UE and network in order to support operation in idle mode and connected mode.
With the measurement specifications, L1 provides measurement capabilities for the UE and E-UTRAN. These measurements can be classified in different reported measurement types: intra-frequency, inter-frequency, inter-system, traffic volume, quality and UE internal measurements; see the RRC Protocol (TS 36.331
In the L1 measurement definitions, the measurements are categorised as:
measurements in the UE: the messages for these will be described in the MAC Protocol (TS 36.321) or RRC Protocol (TS 36.331) or LPP Protocol (TS 36.355); or
measurements in the E-UTRAN: the messages for these will be described in the Frame Protocol or LPPa Protocol (TS TS 36.455).
To initiate a specific measurement, the E-UTRAN transmits a "RRC connection reconfiguration message" to the UE including a measurement ID and type, a command (setup, modify, release), the measurement objects, the measurement quantity, the reporting quantities and the reporting criteria (periodical/event-triggered), see TS 36.331
or E-SMLC transmits an "LPP Request Location Information message" to UE, see TS 36.355
When the reporting criteria are fulfilled the UE shall answer with a 'measurement report message' to the E-UTRAN including the measurement ID and the results or an "LPP Provide Location Information message" to the E-SMLC, see TS 36.355
For idle mode, the measurement information elements are broadcast in the System Information.