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@@ -0,0 +1,116 @@ +This is the interface to the transcevier. + +Each TRX Manager UDP socket interface represents a single ARFCN. +Each of these per-ARFCN interfaces is a pair of UDP sockets, one for control and one for data. +Give a base port B (5700), the master clock interface is at port P=B. +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. +The corresponding core-side interface for every socket is at P+100. +For any given build, the number of ARFCN interfaces can be fixed. + + + +Indications on the Master Clock Interface + +The master clock interface is output only (from the radio). +Messages are "indications". + +CLOCK gives the current value of the transceiver clock to be used by the core. +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. +IND CLOCK <totalFrames> + + + +Commands on the Per-ARFCN Control Interface + +The per-ARFCN control interface uses a command-reponse protocol. +Commands are NULL-terminated ASCII strings, one per UDP socket. +Each command has a corresponding response. +Every command is of the form: + +CMD <cmdtype> [params] + +The <cmdtype> is the actual command. +Parameters are optional depending on the commands type. +Every response is of the form: + +RSP <cmdtype> <status> [result] + +The <status> is 0 for success and a non-zero error code for failure. +Successful responses may include results, depending on the command type. + + +Power Control + +POWEROFF shuts off transmitter power and stops the demodulator. +CMD POWEROFF +RSP POWEROFF <status> + +POWERON starts the transmitter and starts the demodulator. Initial power level is very low. +This command fails if the transmitter and receiver are not yet tuned. +This command fails if the transmit or receive frequency creates a conflict with another ARFCN that is already runnng. +If the transceiver is already on, it response with success to this command. +CMD POWERON +RSP POWERON <status> + +SETPOWER sets output power in dB wrt full scale. +This command fails if the transmitter and receiver are not running. +CMD SETPOWER <dB> +RSP SETPOWER <status> <dB> + +ADJPOWER adjusts power by the given dB step. Response returns resulting power level wrt full scale. +This command fails if the transmitter and receiver are not running. +CMD ADJPOWER <dBStep> +RSP ADJPOWER <status> <dBLevel> + + +Tuning Control + +RXTUNE tunes the receiver to a given frequency in kHz. +This command fails if the receiver is already running. +(To re-tune you stop the radio, re-tune, and restart.) +This command fails if the transmit or receive frequency creates a conflict with another ARFCN that is already runnng. +CMD RXTUNE <kHz> +RSP RXTUNE <status> <kHz> + +TXTUNE tunes the transmitter to a given frequency in kHz. +This command fails if the transmitter is already running. +(To re-tune you stop the radio, re-tune, and restart.) +This command fails if the transmit or receive frequency creates a conflict with another ARFCN that is already runnng. +CMD TXTUNE <kHz> +RSP TXTUNE <status> <kHz> + + +Timeslot Control + +SETSLOT sets the format of the uplink timeslots in the ARFCN. +The <timeslot> indicates the timeslot of interest. +The <chantype> indicates the type of channel that occupies the timeslot. +A chantype of zero indicates the timeslot is off. +CMD SETSLOT <timeslot> <chantype> +RSP SETSLOT <status> <timeslot> <chantype> + + +Messages on the per-ARFCN Data Interface + +Messages on the data interface carry one radio burst per UDP message. + + +Received Data Burst + +1 byte timeslot index +4 bytes GSM frame number, big endian +1 byte RSSI in -dBm +2 bytes correlator timing offset in 1/256 symbol steps, 2's-comp, big endian +148 bytes soft symbol estimates, 0 -> definite "0", 255 -> definite "1" + + +Transmit Data Burst + +1 byte timeslot index +4 bytes GSM frame number, big endian +1 byte transmit level wrt ARFCN max, -dB (attenuation) +148 bytes output symbol values, 0 & 1 + + + + |