Repeat Audio

Performance

GPRS Offers Bandwidths up to 160 kbit/s

With the development of HSCSD, the idea of timeslot bundling to achieve higher data rates was born. GPRS also applies timeslot bundling but additionally, new channel coding schemes have been defined. With 8 timeslots and coding scheme 4, GPRS is able to provide a net throughput rate of 160 kbit/s. However, GPRS can not change physical laws. In other words, the channel coding schemes that provide for higher data transmission rates per timeslot sacrifice data protection for speed. Therefore, the new coding schemes 2, 3 and 4 make less provision for forward error correction and can only be applied when radio conditions are good to excellent.

 

  1 Timeslot 2 Timeslots 8 Timeslots

CS-1:

8.0 kbit/s 16.0 kbit/s 64.0 kbit/s

CS-2:

12.0 kbit/s 24.0 kbit/s 96.0 kbit/s

CS-3:

14.4 kbit/s 28.8 kbit/s 115.2 kbit/s

CS-4:

20.0 kbit/s 40.0 kbit/s 160.0 kbit/s