Multiple channel inhibit sense multiple access with capture

The throughput and delay of the uplink of a metropolitan area packet radio network employing nonpersistent, multiple-channel inhibit-sense-multiple-access (MC-ISMA) with capture are investigated using analysis and discrete event simulation. Both nonslotted and slotted MC-ISMA protocols are shown to produce improvements in throughput of up to 400% compared to the respective ISMA protocols using multiple channels independently, depending on the delay performance criteria. Land-mobile packet radio networks typically employ frequency modulation, which exhibits a distinct capture effect and allows singlechannel ISMA to deliver capacities from 8% to 37% higher than without capture. The effects of the MC-ISMA protocol and capture are shown to combine to produce larger performance improvements than either one alone.<
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