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- Global Standard for Mobile Communications
- Protocol Basics
- Circuit switched, based on TDMA
- Uses GMSK modulation -- A form of MSK that avoids AM
- Channel Bandwidth is 200 kHz
- One carrier-channel is divided into 8 timeslots=one frame each slot with length 577 μs
| 1 timeslot = 1 burst |
148 data + 8.25 guard bits |
577 μs |
| 1 frame |
8 bursts |
4.615 ms |
| 1 51(26) multiframe |
51(26) frames |
235.38(120) ms |
| 1 superframe |
51x26(26x51)-multiframes |
6.12 s |
| 1 hyperframe |
2048 multiframes |
12533.76 s |
- A connection uses one time-slot i.e. one physical channel ==> data-rate = 22.8 b/s
- Burst Structure
- Links
- News
- 25-Sep-2002: Austria launches 3G/UMTS service covering 25% of the countries geographical area
- 09-Oct-2002: first 4G network tested by NTT DoCoMo
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