  This letter studies uplink transmission in large-scale cellular networks with
a Type-II hybrid automatic repeat request (HARQ) retransmission scheme, under
which an unsuccessful transmission (if occurs) is combined with the
corresponding retransmission through maximum-ratio combining (MRC) for
decoding. Based on stochastic geometry analysis, the uplink coverage
probabilities are characterized under a generalized power control scheme in the
scenarios with quasi-static interference (QSI) and fast-varying interference
(FVI), where the same or different interfering users are present during the
transmission and retransmission phase, respectively. Our analytical expressions
reveal some scaling properties of the coverage probabilities and can be used to
evaluate the diversity gain of MRC (i.e., the ratio of the required
signal-to-interference ratio (SIR) to achieve a target coverage probability
with MRC to that without MRC). We show that the diversity gain of MRC is more
remarkable in the scenario with QSI compared to that with FVI. Moreover, the
diversity gain of MRC can be mostly exploited by adopting full
channel-inversion power control.

Networking and Internet Architecture