hi Nick,
(1)
just search the Web with keywords "TCP cwnd RTT AIMD congestion
avoidance retransmit recovery" and you'll get what you want.
must read RFC 2581.
the most interesting example for violent RTT change is TCP
relayed via LEO satellites. TCP has the same problem as us
to stare at a pretty girl in a passing train.
(2)
both because the design of the NEC i-mode center and the PDC
bandwidth, 34 MHz, for DoCoMo. but the J-Phone is not happy
with its 10 MHz bandwidth, too. the 1.5 GMHz radio is harder
than 800 MHz, which can find its way into buildings and car
parks more easily.
the infamous NEC server is the bad guy. as you know, DoCoMo
is already trying to get rid of it ... i-shot bypasses i-mode
mail center in a way similar to what J-Phone has for years.
(3)
it's propaganda to claim C-HTML is easy to use.
official/professional contents are generated by software.
there is no difference to generate what ever markup language.
for personal content, way more time is spent on the design
of the structure and the content retrieval than the C-HTML/WML
tags. so even it make sense, you won't sense much. also most
Web pages for mobile phones can be easily transcoded.
on top of that, personal content constitutes a small part of
non-official Web sites which has much less weight in the economy.
C-HTML is not a subset of HTML, it has many special tags that
ACCESS and others learned from HDML like accesskey and tel.
not because HTML is the most popular we can agree it's any good
language. many have problems with HTML and we have XML now.
cheers,
Ken
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Received on Tue Jun 18 16:45:51 2002