[Nets-seminars] Seminar tomorrow (26th November) GS/302 4pm

[Richard G. Clegg]

Don't forget tomorrow's seminar in EE by Lefteris Mamatas.


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/