ULE over DVB-H

[Georgios Gardikis <g_gardikis@yahoo.gr>]

Dear all,

Regarding ULE, I think it is important for its viability to study the 
issue of its migration to DVB-H. It is unfortunately true that ULE 
cannot be applied to DVB-H ploatforms "as-is", because:

i) DVB-H "steals" four bytes from MAC address field of MPE to use in 
time slicing signalling. These bytes convey the "delta-t" time i.e. the 
time interval until the next burst containing data from the same stream. 
Of course the whole process is a hack, and stems from the fact that DVB 
recognised that the MAC bytes are almost never used for what they were 
initially designed to.
Possible solutions: a) using the NPA field in ULE (and destroy its 
initial purpose, i.e. hack ULE itself), b) adding extra bytes in DVB-H 
header (i.e. altering the candidate standard), c) using and 
standardizing an extension header

ii) DVB-H uses the "MPE-FEC" structure, which is built upon MPE, and 
uses the table_id (first byte in MPE header) to discriminate between 
data bytes and FEC overhead bytes.
Possible solution: directly port ULE to carry FEC frames (no action 
needed) and use of a new Typefield value to declare FEC data.

What do you think?

G.Gardikis
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Dr. Georgios J. Gardikis
Associate Researcher
NCSR "Demokritos", Institute of Informatics and Telecommunications
Athens 153 10, Greece
Tel: +30 210 650 3108
Fax: +30 210 653 2175