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Extremely interesting! Then let's hope that the LTE smartphones will not force the UE to idle mode after sending some keep alive messages (what we call fast dormancy) as this generates today a lot of RRC states change (DCH to idle idle to DCH) which is not very efficient in terms of signalling resources usage as a new RAB will need to be established each time a keep alive message has to be sent. But it was the way apple found to save iPhone battery lifetime: indeed, in some networks Cell_PCH state is not implemented.

Ahmed Abu-Abed

Another power drain is the keep-alive messages for devices on IPv4 and behind a NAT. Nokia published a study on this and found out using IPv6 static addressing saves battery power. IPv4 needs NAT because of shortage of v4 addresses, and for NAT to work a keep-alive mechanism (i.e. bursts of messages) has to run.


Hi Ahmed,

fully true, but NATing also has some good sides:

Kind regards,

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