Voice and data integration in the air-interface of a microcellular mobile communication system

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Voice and data integration in the air-interface of a microcellular mobile communication system (EN)

Mitrou, NM (EN)
Panagopoulou, AD (EN)
Lyberopoulos, GL (EN)

N/A (EN)

In this paper a multiple access protocol and a call acceptance algorithm for voice and data integration in a microcellular mobile communication system is presented. The protocol supports three service classes, namely, circuit-mode voice, burst-mode voice, and data. A hybrid multiplexing scheme with no boundaries is employed, which performs statistical multiplexing of connections of three classes at two different levels, the call-level (for circuit-mode voice) and the talkspurt/message-level (for burst-mode voice and data). This scheme achieves high utilization of the available bandwidth compared to the pure-circuit-switching scheme. The penalty paid is a lower quality in the latter two classes, due to the delay experienced during channel access on each talkspurt/message. A two-party transaction modeling for each class is implemented giving a realistic load on uplink and downlink. Data messages are segmented before transmission and a lower priority of the preemptive type at segment boundaries is assigned to them, in favor of the voice talkspurts transmission. A unified access procedure is presented and the structure of the required control bursts is described. To manage with the apparent system complexity, a simulation tool has been developed in SIMSCRIPT II.5 for performance analysis. With the requirement to satisfy certain quality-of-service limits, the optimum data-segment size is obtained. The maximum acceptable load is determined for various traffic mixes, given in the form of acceptable regions in the load space. Based on these regions, a call acceptance algorithm is implemented and typical simulation results on delay and call blocking are given. (EN)


Multiplexing (EN)
Data Integrity (EN)
Multiple access protocols (EN)
Cellular radio systems (EN)
Network protocols (EN)
Mobile Communication System (EN)
Call acceptance algorithns (EN)
Two-party transaction modeling (EN)
Statistical methods (EN)
Statistical multiplexing (EN)
Hybrid multiplexing (EN)
Algorithms (EN)
Voice/data communication systems (EN)
Microcellular mobile communication system (EN)
Voice/data integration (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

IEEE Transactions on Vehicular Technology (EN)



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