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SUCCESSIVE INTERFERENCE CANCELLATION CARVING OUT
MAC LAYER OPPORTUNITIES
ABSTRACT:
Successive interference cancellation (SIC) is a PHY capability that allows a receiver to decode
packets that arrive simultaneously. While the technique is well known in communications
literature, emerging software radio platforms are making practical experimentation feasible. This
motivates us to study the extent of throughput gains possible with SIC from a MAC layer
perspective and scenarios where such gains are worth pursuing. We find that contrary to our
initial expectation, the gains are not high when the bits of interfering signals are not known a
priori to the receiver. Moreover, we observe that the scope for SIC gets squeezed by the
advances in bitrate adaptation.
Our analysis shows that interfering one-to-one transmissions benefit less from SIC than scenarios
with many-to-one transmissions (such as when clients upload data to a common access point). In
view of this, we develop an SIC-aware scheduling algorithm that employs client pairing and
power reduction to extract the most gains from SIC. We believe that our findings will be useful
guidelines for moving forward with SIC-aware protocol research.