A timer is started when the event occurs (in the case of event 4A going above threshold or event 4B going below threshold).
If the event is still valid when the timer expires, the event report is sent.
If the event condition disappears before the time expires, the time is stopped.
The time-to-trigger process provides a degree of [...]
Its purpose is to restrict the rate at which consecutive event reports are sent.
Once a trigger is activated, further reports cannot be sent until the timer has expired.
Transport channel traffic volume (TCTV) is
the sum of the buffer occupancy for all logical channels that are mapped onto a transport channel and it is calculated at least every TTI.
The TCTV is used as the basis for event triggers for the TVMs (Traffic Volume measurements).
Event 4A: TCTV becomes larger than an absolute threshold.
Event 4B: TCTV [...]
No.
In the CELL_DCH state, the UE does not make cell reselections as it does in all of the other states: instead, the UE moves from cell to cell using handover.
In the CELL_DCH state, the UE cannot monitor the broadcast channels and so any changes that the UTRAN wishes to make to the measurement configurations to a specific UE need to come via the MEASUREMNET CONTROL message via a dedicated control channel (SRB2 in most cases.)
There are two types of measurement variables to store:
1. CELL_INFO_LIST:
contains a list used to define the cells employed for the three basic types of cell signal measurmenet: intrafrequency, interfrequency and inter-RAT cell measurement.
2. MEASUREMENT_IDENTITY:
contains the measurement configuration information that the UE received in SIB11/SIB12 message or in the MEASUREMENT CONTROL message.
The FACH measurement occasion information defines the times when the UTRAN halts downlink transmissions to UEs in the CELL_FACH state
to allow them to make measurements on other cells on other frequencies.
For a UE that is in any state except CELL_DCH, the measurement control information is received via the SIB messages (SIB 11 or SIB 12).
For a UE that is in the CELL_DCH state, the measurements are controlled via a MEASUREMENT CONTROL message directly received from the serving RNC.
UE positioning measurements are made by the UE GPS based measurements and observed time difference of arrival (OTDOA) measurements.
The objective is to estimate the position of the UE within the coverage area.
There are three parameters in UE internal measurements:
1. UE transmit power
2. received RSSI
3. Tx-Rx time difference
