[opendtv] Re: First step to ATSC 3.0 signals big changes
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 16 May 2015 19:07:24 -0400
Craig wrote:
O.K. The correct term is eMBMS
The concept is the same as IP Multicast - one to many - but the protocol is
tweaked via the eMBMS 3GGP standard.
Yes, it is similar to IP multicast, also in the sense that the user equipment
needs a two-way interface to join the desired group. And the cell system
dynamically determines whether eMBMS is more efficient than separate unicast
sessions, based on membership.
This includes a graphic, toward the middle. The red dashed lines show signaling
from the user equipment. Other descriptions of this online.
http://s3.amazonaws.com/sdieee/222-eMBMS_tech_overview_IEEE_112712.pdf
Once broadcasters jump into the deep end, building a two-way wireless
infrastructure, the all sorts of new possibilities open up. The biggest
limitation as of now is the one-way broadcast nature of the medium.
Bert
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