Performance Analysis of High Speed Circuit Switched Data (HSCSD) over GSM
A nonpreemptive priority queueing system for voice and High Speed Circuit Switched Data (HSCSD) integration in GSM is presented and analysed. An HSCSD connection can be established if the number of available channels is between a minimum acceptable capacity, b, and a maximum required capacity, B. This leads to an effective service time for HSCSD calls, proportional to the bandwidth negotiated with the base station. Upon arrival, handoff requests are inserted in a Head Of Line (HOL) queue with finite capacity. Priority is given to voice handoffs over HSCSD handoffs. New call attempts which find channels occupied are also inserted in a HOL queue with finite capacity where priority is given to voice calls over HSCSD calls. Queueing offers a means of increasing total carried traffic, while improving the perceived service quality. Guard channels can also be set aside for handovers to respect Quality-of-Service (QoS) requirements. A performance analysis, when mean service times for voice and HSCSD calls are different, is reported. Performance results show blocking and forced termination probabilities for both types of calls. Delays experienced by HSCSD calls are compared to an optimal transmission operating at the maximum capacity required by HSCSD users.
KeywordsQueue Length Handoff Call Voice Call Optimal Transmission European Telecommunication Standard Institute
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