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Table 2 Symbols used for multiple traffic sources

From: Random access with adaptive packet aggregation in LTE/LTE-A

Notation Definition
N r Number of devices with realtime traffic
N n Number of devices with non-realtime traffic
a r Packet aggregation number for real time
a n Packet aggregation number for non-real time
τ r The probability a device with realtime traffic is sending a preamble
τ n The probability a device with non-realtime traffic is sending a preamble