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Modern wireless interfaces support a physical layer capability called Message in Message (MIM). Briefly, MIM allows a receiver to disengage from an ongoing reception, and engage onto a stronger incoming signal. Links that otherwise conflict with each other, can be made concurrent with MIM. However, the concurrency is not immediate, and can be achieved only if conflicting links begin transmission in a specific order. The importance of link order is new in wireless research, motivating MIM-aware revisions to link scheduling protocols. This paper identifies the opportunity in MIM-aware reordering, characterizes the optimal improvement in throughput, and designs a link layer protocol to achieve it. Testbed results confirm the performance gains of the proposed system.

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Abstract-Reception of duplicate packets by a node in a wireless network is a common occurrence. Reasons for repeated transmissions range from broadcast flooding to multicast streaming to unicast forwarding. These repeated transmissions may also get involved in collisions like other original transmissions. We argue that when one of the colliding packets is previously overheard, its interference can be cancelled to decode the other packet. In other words, when a receiver overhears a packet, it becomes effectively immune to the interference caused by the packet's subsequent transmission. We refer to this as known interference cancellation (KIC). In this paper, we identify the scenarios in which KIC is applicable. We then implement KIC on USRP/GnuRadio testbed to demonstrate its feasibility and conduct QualNet simulations to illustrate its potential performance gain.