Hello,

Concerning MBMS (Multicast Broadcast Multicast Service), I'd like to know
what channels are used and how we are sure the streams are not duplicated
for each
end users that ask the multicast service, as I've read that when the radio
ressources are
allocated, it's possible to switch from point to point (p-t-p) to point to
multipoint (p-t-m)
or p-t-m to p-t-p depending on the numbers of users in the network in order
to optimize
the radio ressources . Is someone has an idea about it? How point to
multipoint works ?

I've noticed that if IP multicast in 3GPP (R99) is implemented, there is one
GTP-U tunnel per terminal, and multicast flow, SGSN and APN (may be use of
dedicated
channels) whereas with MBMS there is one GTP-U tunnel per multicast flow,
SGSN and APN.
In IP Multicast in 3GPP (R99) have you have a copy of each streams for each
users? In MBMS
how p-t-p and p-t-m works as we have one GTP-U tunnel per multicast flow ?

I'm thanking you in advance





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