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> but there is some question as to whether the spectrum is physically there to support HD calls for all This surprises me. I assumed that with all the spectral
by profmonocle 11y ago
> but there is some question as to whether the spectrum is physically there to support HD calls for all
This surprises me. I assumed that with all the spectral efficiency gains that've been made to support higher data usage, doubling (or more) the bit rate of voice calls wouldn't be a big deal. Now I'm curious what percentage of overall data traffic on a cellular network is voice.
- abalashov 11y agoYeah, but the data usage is all asynchronous stuff, not especially delay-sensitive. It can be shipped in large packets. Voice isn't YouTube; it can't be buffered (much), so it's a hailstorm of a very large number of very small packets[1] that all have to get there in a sufficiently quick, reliable and ordered fashion as to approximate the circuit-switched experience. That changes the physical layer oversubscription economics significantly. [1] A typical "packetisation duration" in wireline VoIP is 20 ms. That's the duration of audio buffered into a single RTP frame. Edit: I'm not saying definitively that it's not physically possible to deliver high-bandwidth voice conversations for everyone as table stakes. I'm ultimately a fixed-line guy and not in a sufficient position of knowledge in wireless/RF to know that for sure. I only meant to say that there are known questions about its realism.