2.25 Considering time domain Tx activity

Consideration of time-domain activity of transmissions in SEAMCAT simulation for Generic and Cellular systems

When using SEAMCAT for simulation of networks in compatibility and sharing studies, sometimes users face questions about how to simulate transmitters which are not active all the time. This corresponds to the terms/parameters Duty cycle, Activity factor, Activity ratio, Probability of transmission, BS/UE TDD ratio and similar terms, depending on type of equipment used, or a combination of these.

As this is a common question raised, this annex presents some of the solutions which can be used to simulate transmitters taking into account non-continuous transmitting behaviour.  This is a non-exhaustive list and there are other possible ways to achieve similar outcomes. Which method is to be used depends on the specific scenario. 

These methods are mainly targeted towards time-domain activity on the interfering system link, however some of these could also be applied to the victim system if relevant.

Different methods to consider transmitters which are not active all the time in interference calculations:

• Tx power distribution

• Additional Loss distribution

• Setting Uniform (and Closest interferer) mode of simulation together with Transmitter density and Traffic

• Adjusting Tx power to average power

• Conditional probability formula & law of total probability

• Separate activity vector combined with extracted results vectors

• Reduce the number of active Tx to simulate