ISSN : 1796-2021
Volume : 1    Issue : 3    Date : June 2006

Distributed Admission Control in Multiservice IP Networks: Concurrency Issues
Solange Rito Lima, Paulo Carvalho and Vasco Freitas
Page(s): 1-9
Full Text:
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In distributed admission control (AC) schemes, handling concurrent AC decisions assumes a
relevant role in avoiding over or false acceptance and, consequently, service quality degradation.
This problematic is even more intricate in multiservice network environments where distinct service
levels need to be fulfilled. This paper debates and points out solutions to mitigate the negative
impact that distributed admission of flows might have on the service level guarantees provided to
network customers. Keeping in mind that simplicity is a key factor for deployable AC solutions, we
suggest and discuss the use of (i) a service-dependent concurrency index; (ii) a token-based
system and (iii) a rate-based credit system, as alternative or complementary proposals to minimize
or solve QoS degradation resulting from AC false acceptance.

Index Terms
Concurrent Admission Control; Quality of Service; Differentiated Services; Multiservice Networks