re: I'm wondering if anyone can analyze the other question here, which is the suitability of VoIP for wireless networks - IMS excluded, but Wimax, Wifi, HSPA, UMTS, everything else - included.
So more generally, anything categorized as 2.5G, 3G, and beyond. But not 2G.
re: Does any mobile RF scheme have relative advantages/disadvantages?
I've had GSM/TDMA and CDMA 2G voice service from different networks. That is not without dropped calls, missed seconds, and garbled speech, and that is circuit switched at its root. Arguably those could called be RF problems, but more a matter of signal levels, interference, and poor voice codecs than anything fundamental to the RF layer itself.
At the moment I'm not seeing why the RF scheme for 3G/4G should be a key factor. Aside from having the same signal level and interference issues as 2G, it seems more a question of contention in switches and/or congested backhaul links, or overloaded multiple access to the base station but those are a capacity issues not an RF issue.
Do any flavors of DSL have better VoIP performance than any flavor of DOCSIS, where the performance difference can be directly attributed to that physical layer technology difference, as opposed to a reason related to congestion/capacity? I haven't seen VoIP quality comparisons between DSL and cable but maybe there are some. |
