At 10:09 2001-01-22 +0000, you wrote:
>Arjen van Blokland wrote:
> >
> > Can somebody comment if my thoughts are correct?
> >
> > People claim that i-mode is always on. This is technically speaking
> > incorrect and gives the readers outside Japan a wrong impression on the
> > capabilities of i-mode.
>A very thorough analysis, thanks. In that light, how do we explain the
>following:
>
>my phone is 'off' the network (the i is not blinking)
>someone sends me an email and immediately my phone connects (i starts
>blinking) and the mail is delivered.
>
>Exactly how is the handset getting notified of the incoming mail if it's
>not yet on the network?
PDCP is logically a full packet network and not circuit switched or a
hybrid. I would like to argue that it is so also in practice. But is it
always on? I do not know all details of how the PDCP networks works in
lower levels, but generally you need to make a difference between logical
layers and physical layers (and sometimes the data link layer).
For the physical layer (the radio link) it is not fully always on, since
time slots need to be negotiated, tunels established etc. So there will be
a radio link delay, but this does not make it to a circuit switched
network. 3G isn't that much better in this perspective. Only WLAN is...
/g
>I am confused.
>
>r e n
>
>
> > To verify please do the following experiment.
> >
> > Check the i-icon on your phone. If not connected to the i-mode network
> > (connection OFF, but able to connect to i-mode packet switched network),
> > the i-icon is not blinking. When you connect to the i-mode network, it
> > takes, depending on the time of the day, between 1 second (early in the
> > morning) and 5 seconds (around 11pm). Once the connection is established,
> > the i-icon is blinking meaning the connection is ON. If no traffic is send
> > or received for a period of 3-4 minutes, the connection is automatically
> > finished and the i-icon stops blinking. The connection is OFF.
> >
> > Based on the network architecture as published last year in Nikkei
> > Communications and this experiment, i-mode makes use of a hybrid solution,
> > circuit switched until the M-SCP component in the network and
> > packet-switched (called the PCD-P network) higher up in the network.
> >
> > Arjen van Blokland
> > arjen@fra.allnet.ne.jp
> >
> > [ Did you check the archives? http://www.appelsiini.net/keitai-l/ ]
>
>--
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>e-business technology | engineering & strategy | wireless
>
>[ Did you check the archives? http://www.appelsiini.net/keitai-l/ ]
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Received on Mon Jan 22 17:39:27 2001