Section: 4.2.4.2 In-session activity time for E-RABs
Content: a) This measurement provides the aggregated active session time for E-RABs in a cell. The measurement is split into subcounters per E-RAB QoS level (QCI). b) CC c) Number of s“in ession ”seconds aggregated for E-RABs with a certain QCI. , where “in session” has the following definitions: - E-RABs with bursty flow is said to be “in session” for a UE if any E-RAB data on any Data Radio Bearer (UL or DL) has been transferred during the last 100 ms for that QCI - E-RABs with continuous flow are always seen as being “in session” in the context of this measurement, and the session time is increased from the first data transmission on the E-RAB until 100 ms after the last data transmission on the E-RAB. The possible QCIs are described in TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [9]. The sum of all supported per QCI measurements shall equal the total session seconds. In case only a subset of per QCI measurements is supported, a sum subcounter will be provided first. How to decide for a particular QCI if the E-RAB is of type continuous flow is outside the scope of this document. d) Each measurement is an integer value. The number of measurements is equal to the number of QCIs plus a possible sum value identified by the .sum suffix. e) The measurement name has the form ERAB.SessionTimeQCI.QCI f) where QCI identifies the E-RAB level quality of service class. g) EUtranCellFDD EUtranCellTDD h) Valid for packet switched traffic i) EPS j) This measurement is to support the Retainability KPI “E-RAB Retainability” defined in [13].