Cellular CDMA Capacity in Hotspots with Limited Ad Hoc Relaying

In this paper we consider the capacity improvements in a cellular CDMA hotspot with out-of-band ad hoc traffic relaying. Two different multihop relaying options are compared, and an analytic model is used to compute the effects on CDMA uplink and downlink capacities. The results show that significant capacity improvements are possible using ad hoc relaying, but these are dependent upon the ad hoc to cellular coverage ratio and other parameters. It is also shown that in some situations ad hoc relaying should be used to shrink the cells in question, but in other cases it should be used to shed traffic from the hotspot cell. The results give a useful indication of the potential role of ad hoc relaying in CDMA hotspot traffic situations.