Chorus is a new protocol that improves the efficiency and scalability of wireless broadcast using self-interference cancellation. It allows packet collisions at the MAC/PHY layers by effectively detecting and decoding overlapping packets carrying the same data. Chorus resolves collisions using symbol-level interference cancellation and combines the resolved symbols to restore packets. It also uses a cognitive sensing and scheduling MAC scheme. Evaluation shows Chorus has superior performance over CSMA/CA in scalability, reliability, delay, and various network scenarios.

1. DELAY-OPTIMAL BROADCAST FOR MULTIHOP WIRELESS NETWORKS
USING SELF-INTERFERENCE CANCELLATION
ABSTRACT:
In this paper, we propose a new protocol called Chorus that improves the efficiency and
scalability of broadcast service with a MAC/PHY layer that allows packet collisions. Chorus is
built upon the observation that packets carrying the same data can be effectively detected and
decoded, even when they overlap with each other and have comparable signal strengths. It
resolves collision using symbol-level interference cancellation, and then combines the resolved
symbols to restore the packet. Such a collision-tolerant mechanism significantly improves the
transmission diversity and spatial reuse in wireless broadcast.
Chorus’ MAC-layer cognitive sensing and scheduling scheme further facilitates the realization of
such an advantage, resulting in an asymptotic broadcast delay that is proportional to the network
radius. We evaluate Chorus’ PHY-layer collision resolution mechanism with symbol-level
simulation, and validate its network-level performance via ns-2, in comparison with a typical
CSMA/CA-based broadcast protocol. Our evaluation validates Chorus’s superior performance
with respect to scalability, reliability, delay, etc., under a broad range of network scenarios (e.g.,
single/multiple broadcast sessions, static/mobile topologies).
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