The capabilities of each phone are specified as so-called multislot classįor a table of multislot classes, please see 3GPP TS 45.002, or a summarized version at wikipedia. Normally, phones can not decode all 7/8 time-slots, as they operate in half-duplex mode and need some time for transmit, too. On the MS (phone) side, things are not that simple. If you're running a single-TRX small BTS, the first timeslot is always allocated for the BCCH/CCCH, leaving 7 time-slots available for voice (TCH) and data (PDTCH).įor example, a total of 7 time-slots in MCS-9 coding scheme would render MCS-9 has no error correction coding at all, but t GPRS channel coding ¶Įach of the 8 GSM time-slots can operate i a number of different coding schemes:īTS equipment is normally capable to run all timeslots in GPRS mode. The lower numbers (CS-1/MCS-1) have the most error coding and are very contention on the radio channel / resource sharing by multiple phonesĭepending on the characteristics of the radio channel (interference, bit errors, link quality, C/I), the network willĭynamically select the best coding scheme.channel coding, which in turn depends on.There are multiple aspects that relate to the problem This page tries to outline the possible achievable GPRS bit-rates.
