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We consider framed slotted Aloha where $m$ base stations cooperate to decodemessages from $n$ users. Users and base stations are placed uniformly at randomover an area. At each frame, each user sends multiple replicas of its packetaccording to a prescribed distribution, and it is heard by all base stationswithin the communication radius $r$. Base stations employ a decoding algorithmthat utilizes the successive interference cancellation mechanism, both inspace--across neighboring base stations, and in time--across different slots,locally at each base station. We show that there exists a threshold on thenormalized load $G=n/(\tau m)$, where $\tau$ is the number of slots per frame,below which decoding probability converges asymptotically (as$n,m,\tau\rightarrow \infty$, $r\rightarrow 0$) to the maximal possiblevalue--the probability that a user is heard by at least one base station, andwe find a lower bound on the threshold. Further, we give a heuristic evaluationof the decoding probability based on the and-or-tree analysis. Finally, we showthat the peak throughput increases linearly in the number of base stations.

Slotted Aloha for Networked Base Stations with Spatial and Temporal Diversity