Product Description

nanoBTS Product Description Software Specification
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5.12.2 TRX Controlled Parameters
Attribute Default Value Notes
TRX database schema
TX Power ramps 13 levels, 32 x UInt16
TX Scale factors 13 levels, UInt16 for each level
TX Frequency compensation 12 ARFCN’s, UInt16 for each ARFCN
TX DC Offsets 0x0, 0x0 2 x SInt16
RXGainControlNormal
(i.e. uplink receiver)
26 AGC steps, UInt16 for each step
RXGainControNWL
(i.e. downlink receiver)
26 AGC steps, UInt16 for each step
RxAccurateGainNormal
(i.e. uplink receiver)
26 AGC steps, UInt16 for each step
RxAccurateGainNWL
(i.e. downlink receiver)
26 AGC steps, UInt16 for each step
RxFreqCompNormal
(i.e. uplink receiver)
12 ARFCN’s, SInt16 for each ARFCN
RxFreqCompNWL
(i.e. downlink receiver)
12 ARFCN’s, SInt16 for each ARFCN
RxDC Offsets 0x0, 0x0 2 x SInt16
5.13 Operations
5.13.1 Network Listen
The BTS supports
• the "Channel Usage" test to determine received power on requested ARFCNs.
• the "BCCH Channel Usage" test to determine if the channel contains a FCH and
SCH channel. It reports report the power level, BSIC, frame and sub-frame offset if a
BCCH is detected.
• the "BCCH Info" test. It decodes SI1 to determine the CA list and SI3 to determine
the CGI (Cell Global Identity). It captures SI2, SI2-bis, SI2-ter and sends them as
entire SI messages in the result. The test may take up to 35 seconds to pick up all of
the system information types off-air.
• the "Frequency Synchronisation" test to measure the frequency offset of other
basestations with respect to its own OCXO setting. For each ARFCN it reports a
frequency quality metric and the offset in ppb’s. When the frequency error is such
that the BTS can measure a coarse frequency offset from the FCH, but cannot
decode the SCH (because the DSP equaliser cannot resolve the frequency offset) it
reports an error with a frequency quality of "0".