It is said "Terminal Initiated Network assisted handofffs
should be given preference since the
mobile terminal has knowledge of all the networks an applications running
on the device".
I do not agree
here as it can also be argued that Network Initiated terminal assisted mode
brings the possibility for the nework to select the best available
access network for the terminal according to link
utilization and Access Point load information it has and which the
terminal doesn't. Just letting the terminal have the final
decision could then result in handovers to access network where the user
will experience severe service degradation because it had ignored such
information.
Therefore i will
suggest just evocating different possible initiationt/assistance
handover modes within the requirements Document without mentioning preference on
any of them. This preference should rather be let at the discretion of
the hanfover policy function that can reside either on the terminal or the
network.
Section 4
Architecture
4.1 layer 2.5
It is said
"The
standard shall define SAP(s) for providing layer 1 (PHY), layer 2 (MAC), and
layer 2.5 (Mobility Management) information to higher layer entity such as
Mobile IP".
Again
one of the reason of defining a layer 2.5 model was that it allowed higher layer
mobility protocol not to understand each of the underltying layers as all those
layers will now interface to the 2.5 layer. So with the use of L2.5,
information from PHY and MAC need not anymore be passed directly to
higher layer moility protocol as they will be passed to L2.5 wich will
present it to unique format
upwards!
Section
6 Reference Model
It
is not clear from the document where an input to any particular layer
comes from and which direction (up or down) the output is directed
at
We
can further discuss these points tommorrw during the conf
call
Eric
Njedjou
France
Telecom