Abstract—In distributed admission control (AC) schemes,handling concurrent AC decisions assumes a relevant rolein avoiding over or false acceptance and, consequently,service quality degradation. This problematic is even moreintricate in multiservice network environments wheredistinct service levels need to be fulfilled. This paperdebates and points out solutions to mitigate the negativeimpact that distributed admission of flows might haveon the service level guarantees provided to networkcustomers. Keeping in mind that simplicity is a key factorfor deployable AC solutions, we suggest and discuss theuse of (i) a service-dependent concurrency index; (ii) atoken-based system and (iii) a rate-based credit system,as alternative or complementary proposals to minimize orsolve QoS degradation resulting from AC false acceptance.

Index Terms—Concurrent Admission Control; Quality ofService; Differentiated Services; Multiservice Networks

Cite: Solange Rito Lima, Paulo Carvalho, and Vasco Freitas, "Distributed Admission Control in Multiservice IP Networks: Concurrency Issues," Journal of Communications, vol. 1, no. 3, pp. 1-9, 2006.