Distributed Aggressive DCA in a DQDB MAN Based UMTS Access Network

In this paper "aggressive" strategies for dynamic channel allocation in a UMTS access network based on a DQDB MAN architecture are presented. The channel allocation schemes utilise a distributed resource allocation protocol embedded into the DQDB MAN architecture. The proposed resource allocation protocol is based on traffic source activity (which is at talkspurt level for voice traffic) in contrast to most allocation strategies that operate only at call level. Performance of the aggressive schemes in terms of speech frame clipping and outage probability is presented and compared to FCA and "timid" DCA schemes. Results show that distributed aggressive DCA can exploit the "soft capacity" inherent in the packet reservation access scheme used for the radio interface.