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Chapter 5Upstream channel capacity and characterisation p5.2 Case studiesHaving introduced and validated the OPNET simulation model in Chapter 4, a numberof analyses are presented here to define the fundamental properties and scalability of theupstream channel. Specific issues of the case studies address the following performanceanalysis given below.• Offered load scalability: how the protocol scales against increasing the offeredload generated by a number of active stations, and what the delay and systemthroughput characteristics are.• Capacity in terms of active stations: how the protocol scales against anincreasing number of active stations, each generating a predefined traffic load.• Station’s buffer capacity: how the performance characteristics change if thestations’ buffer capacity is altered.• Effects of contention slots for data transmission: what the delay and systemthroughput characteristics are when transmitting a determined number of cells inthe ‘contention-based access region’.• Effects of varying the maximum reservation request message per station: howthe protocol scales against an increase in the maximum ‘reservation requestmessage’.• Effects of changing the number of MCI frames: performance gain when thesignalling frame cycle is reduced.• Effects of varying the packet size in isochronous streams: how the protocolscales against changing the packet size and inter-arrival times when deliveringisochronous data rates.These configurations are examined because they demonstrate the type of results thatcould be obtained using both the simulation and analytical model, and also help toidentify key issues and suggest performance optimisation methods with a wide range ofapplications. Results, such as maximum network capacity, can be used for capacity5-2