Real time applications on LTNs or 2.5/3G networks

Hello all,

I am considering starting a new paper on improving realtime TCP applications
on LTN. However before I start duplicating work I would like to ask this
group if such work is allready beeing done?

Before you respond, let me give some background:

I am testing several applications for performance on the GPRS network (2.5G)
and am running into the following problem:

Realtime applications (mostly terminal applications/thin clients) that use
TCP as protocol work pretty bad over GPRS. There are several reasons for
this:
1) Because of Nagle ofter the congestion window is 1 packets and triggers no
form of Fast Retransmit nor Limited transmit
2) When disabeling Nagle, the IP packet overhead in general is too high
resulting in Queueing delay
3) Any other suggestions from this group?

For this problem some possible solutions exists e.g. using UDP and make your
own protocol or adding timers that throthle data before sending it without
Nagle.

I could write some Informational RFC discussing possible solutions for this.

Any ideas or comments?

Ruud Schramp



+31-70-3362341

KPN Valley
Postbus 421
2260AK Leidschendam
Netherlands


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