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https://github.com/RangeNetworks/openbts.git
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c0a5c1509e
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2242 19bc5d8c-e614-43d4-8b26-e1612bc8e597
117 lines
3.9 KiB
Plaintext
117 lines
3.9 KiB
Plaintext
This is the interface to the transcevier.
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Each TRX Manager UDP socket interface represents a single ARFCN.
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Each of these per-ARFCN interfaces is a pair of UDP sockets, one for control and one for data.
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Give a base port B (5700), the master clock interface is at port P=B.
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The TRX-side control interface for C(N) is on port P=B+2N+1 and the data interface is on an odd numbered port P=B+2N+2.
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The corresponding core-side interface for every socket is at P+100.
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For any given build, the number of ARFCN interfaces can be fixed.
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Indications on the Master Clock Interface
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The master clock interface is output only (from the radio).
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Messages are "indications".
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CLOCK gives the current value of the transceiver clock to be used by the core.
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This message is sent whenever a trasmission packet arrives that is too late or too early. The clock value is NOT the current transceiver time. It is a time setting the the core should use to give better packet arrival times.
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IND CLOCK <totalFrames>
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Commands on the Per-ARFCN Control Interface
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The per-ARFCN control interface uses a command-reponse protocol.
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Commands are NULL-terminated ASCII strings, one per UDP socket.
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Each command has a corresponding response.
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Every command is of the form:
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CMD <cmdtype> [params]
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The <cmdtype> is the actual command.
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Parameters are optional depending on the commands type.
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Every response is of the form:
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RSP <cmdtype> <status> [result]
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The <status> is 0 for success and a non-zero error code for failure.
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Successful responses may include results, depending on the command type.
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Power Control
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POWEROFF shuts off transmitter power and stops the demodulator.
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CMD POWEROFF
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RSP POWEROFF <status>
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POWERON starts the transmitter and starts the demodulator. Initial power level is very low.
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This command fails if the transmitter and receiver are not yet tuned.
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This command fails if the transmit or receive frequency creates a conflict with another ARFCN that is already runnng.
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If the transceiver is already on, it response with success to this command.
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CMD POWERON
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RSP POWERON <status>
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SETPOWER sets output power in dB wrt full scale.
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This command fails if the transmitter and receiver are not running.
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CMD SETPOWER <dB>
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RSP SETPOWER <status> <dB>
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ADJPOWER adjusts power by the given dB step. Response returns resulting power level wrt full scale.
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This command fails if the transmitter and receiver are not running.
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CMD ADJPOWER <dBStep>
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RSP ADJPOWER <status> <dBLevel>
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Tuning Control
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RXTUNE tunes the receiver to a given frequency in kHz.
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This command fails if the receiver is already running.
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(To re-tune you stop the radio, re-tune, and restart.)
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This command fails if the transmit or receive frequency creates a conflict with another ARFCN that is already runnng.
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CMD RXTUNE <kHz>
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RSP RXTUNE <status> <kHz>
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TXTUNE tunes the transmitter to a given frequency in kHz.
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This command fails if the transmitter is already running.
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(To re-tune you stop the radio, re-tune, and restart.)
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This command fails if the transmit or receive frequency creates a conflict with another ARFCN that is already runnng.
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CMD TXTUNE <kHz>
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RSP TXTUNE <status> <kHz>
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Timeslot Control
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SETSLOT sets the format of the uplink timeslots in the ARFCN.
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The <timeslot> indicates the timeslot of interest.
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The <chantype> indicates the type of channel that occupies the timeslot.
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A chantype of zero indicates the timeslot is off.
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CMD SETSLOT <timeslot> <chantype>
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RSP SETSLOT <status> <timeslot> <chantype>
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Messages on the per-ARFCN Data Interface
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Messages on the data interface carry one radio burst per UDP message.
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Received Data Burst
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1 byte timeslot index
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4 bytes GSM frame number, big endian
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1 byte RSSI in -dBm
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2 bytes correlator timing offset in 1/256 symbol steps, 2's-comp, big endian
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148 bytes soft symbol estimates, 0 -> definite "0", 255 -> definite "1"
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Transmit Data Burst
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1 byte timeslot index
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4 bytes GSM frame number, big endian
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1 byte transmit level wrt ARFCN max, -dB (attenuation)
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148 bytes output symbol values, 0 & 1
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