Chapter 4.5

Scheduling, link adaptation and hybrid ARQ

Erik Dahlman, Stefan Parkvall, Johan Skold and Per Beming

One key characteristic of mobile radio communication is the typically rapid and significant variations in the instantaneous channel conditions. There are several reasons for these variations. Frequency-selective fading will result in rapid and random variations in the channel attenuation. Shadow fading and distance-dependent path loss will also affect the average received signal strength significantly. Finally, the interference at the receiver due to transmissions in other cells and by other terminals will also impact the interference level. Hence, to summarize, there will be rapid, and to some extent random, variations in the experienced ...

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