I'm increasingly seeing mobile networking technologies being used to get internet access in areas where it is otherwise not available.
While mobile networking is usually not yet viable as the primary internet connection, mobile technology looks like a good option for an emergency fallback.
Bandwith is not the problem: With HDSPA, speeds of several MBit are possible, which provides a decent uplink. However, I know from personal experience that mobile networks internet links (via GPRS, UMTS etc.) have much higher latencies than regular DSL (200-400 ms for UMTS, even more for GPRS). This of course makes them unsuitable for many applications, such as VoIP and teleconferencing.
- Where does this latency come from?
- Are there any technologies available that can mitigate this problem, to make UMTS viable for low-latency applications?
I assume there must be some inherent technical reason, but what is it? Does it have to do with how data is transmitted over the air? And if it is because of the wireless transmission, why does WLAN have much lower latencies?