Nokia Siemens Networks educates the market and pushes its solution for the mobile signaling problem for long time now, as many operators say it is a major problem both in terms of performance (traffic and long-living sessions) and well as battery draining issue for subscribers. This becomes even more relevant to NSN now, as mobile broadband becomes its main business focus (here).
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",, Standardized in 3GPP Release 8 [see below], Nokia Siemens Networks’ Network Controlled Fast Dormancy or NCFD aids by acting as a more intermediate state: one with less signaling and faster reconnections"
"Nokia Siemens Networks’ Smart Labs [here] tested popular over-the-top (OTT) VoIP applications running on different smartphone operation systems. One of the results was the huge signaling load caused by VoIP applications in non-NCFD enabled smartphones – 600% more signaling traffic"
See "Faster connections, longer-lasting batteries: A fifth of all smartphones now benefit from Network Controlled Fast Dormancy" - here.
See also - "T-Mobile Netherlands Reduces Data Signaling by 30% with NSN Cell_PCH" - here and "SFR Deploys NSN Cell_PCH Optimization Technology" (here)