Architecture of oscomBB
Hello everyone, I'm new to OscomBB and have few questions about its architecture. I have ordered the C123 and the serial cable. Note: I have OpenBTS running quite well and would like now to explore the other end. I did look at the Software Overview page and have the following questions: a/ where can I log the raw burst (156 bits)? [ not the IQ samples ] on the PC? on the ARM7? b/ on the downllink path, how is the FCH detection process split between dsp, arm7 and PC? ie from raw burst to FCH detection indication and offset value. c/ on the downllink path, how is the SCH decode process split between dsp, arm7 and PC? ie from raw burst to GSM frame number, BSIC etc.. d/ on the downllink path, how is the BCCH decode process split between dsp, arm7 and PC? ie from raw burst to System Informations... d/ on the uplink path, how the RACH encode process (RACH_REQ) is split between dsp, arm7 and PC? Thank your for your kind answers. Rgds Nghia
Hi, On Sun, Sep 18, 2011 at 10:14:24AM +0200, nghia phan wrote:
b/ on the downllink path, how is the FCH detection process split between dsp, arm7 and PC? ie from raw burst to FCH detection indication and offset value. c/ on the downllink path, how is the SCH decode process split between dsp, arm7 and PC? ie from raw burst to GSM frame number, BSIC etc.. d/ on the downllink path, how is the BCCH decode process split between dsp, arm7 and PC? ie from raw burst to System Informations... d/ on the uplink path, how the RACH encode process (RACH_REQ) is split between dsp, arm7 and PC?
It's the same for all of them: * demodulation, interleaving, convolutional code, etc. is all in the DSP * scheduling (TDMA frame/multiframe/etc) as well as frequency and tx power control is done by the ARM * the interface between layer1 and layer2 (LAPDm) is via serial line and everything L2 or higher runs on the PC. -- - Harald Welte <laforge@gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
participants (2)
-
Harald Welte -
nghia phan