2006-10-07 07:12:18 · 2 answers · asked by shafi p 1 in Science & Mathematics ➔ Engineering
Both over the air (radio) and in the signalling between exchanges there is error detection. This is done using Cyclic Redundancy Check (CRC) on a block of data. The CRC algorithm is specially designed to maximise the probablility of detecting the error. It's a bit like a checksum.
If you want to know exactly what GSM uses, then the whole set of standards for GSM are available online. (www.3gpp.org). Warning though - there are hundreds of specs each many hundreds of pages long. Not sure which one has this info in.
2006-10-07 07:19:54 · answer #1 · answered by amania_r 7 · 0⤊ 0⤋
CRC is not the only coding used. Typically, CRC is used on a packet basis. However, the real error correction scheme used is a convolutional code concatenated with a turbo code.
2006-10-07 08:02:32 · answer #2 · answered by cw 3 · 0⤊ 0⤋