[Nets-seminars] Talk in EE GS/302 4pm 26th November

[Richard G. Clegg]

Last talk for this term will be on 26th November (next Wednesday) by our 
own Lefteris Mamatas

Title:
Differentiating Services with Non-Congestive Queuing (NCQ)

Abstract

Typical scheduling paradigms of packet networks do not match well the
requirements of non-congestive applications, which transmit minor data 
volumes but suffer, however, major queuing delays. Such applications do 
not really cause significant delays, raising naturally the issue of 
whether they deserve a prioritized service or not. For example, a 
sensor-generated packet may experience almost-zero delay favored by a 
prioritized scheduling scheme, at an almost-zero cost to other 
congestive flows. In the same context, a voice application, although it 
generates periodic traffic at small rates, experiences delays comparable 
with other applications that transfer large data volumes.

In this talk, we discuss a new packet service paradigm, called 'Less 
Impact Better Service' (LIBS), which is realized through a novel queuing 
discipline, called 'Non-Congestive Queuing' (NCQ). NCQ prioritizes small 
packets when conditions permit, and utilizes service thresholds to 
confine the delay impact of prioritization on congestive applications. 
We show that LIBS and NCQ satisfy more users with diverse demands on 
delay and throughput. We obtained both analytical and simulation 
results, which are very promising.

-- 
Richard G. Clegg,
Dept of Elec. Eng.,
University College London
http://www.richardclegg.org/