Impact of tme division duplexing on delay variation in slotted access systems

摘要

Slotted access systems and Time Division Duplexing (TDD) are two techniques well suited to various local loop configurations.Access netowrks are built on a shared physical medium with point-to-multipoint architecture.A centralised approach with one master entity and several slave entities is adopted.A polling-based MAC protocol enables the slave entities to dynamically share the medium.In this paper we assume that the master entity grants permits to the slaves using eithe the Virtual Clock or the RCSP service discipline.Both constant-and variable-length (TDD) frames are considered.The impact of time duplexing on delay variation in constant bitrate connections with variable bitrate background tr4affic is particularly investigated.For theat purpose,several trafic parameters are considered,such as offered load and number of connections.