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).
",, 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)