Analysis Start Boundary (LTE)

Default: Frame

Range: Frame, Half-Frame, Subframe, Slot (uplink only)

Analysis Start Boundary specifies the alignment boundary of the Result Length time data. To ensure that this alignment can be achieved, the total amount of data acquired by the VSA is at least the Result Length plus the length of the alignment boundary specified by Analysis Start Boundary. For example, when Analysis Start Boundary is set to Half-Frame, the total acquisition is at least Result Length + 10 slots (and the data available for analysis would start at a Half-Frame boundary).

Once the Result Length data is located within the time capture, Measurement Offset and Measurement Interval determine what part of the Result Length data is to be analyzed. The Measurement Interval data is shown on the Time trace. See image below for more information.

Analysis Start Boundary cannot be set to Slot for downlink signals since MIMO Decoding must be applied beginning at a subframe boundary.

Since uplink signals do not contain a separate synchronization channel, the demodulator cannot determine the frame boundary exactly unless there is a unique slot in a user mapping and that unique slot is present within the Search Time data.