The exchange of independent information between

two nodes in a wireless network can be viewed as two

unicast sessions, corresponding to information trans-

fer along one direction and the opposite direction. In

this paper we show such information exchange can

be efficiently performed by exploiting network cod-

ing and the physical-layer broadcast property offered

by the wireless medium, which improves upon con-

ventional solutions that separate the processing of

the two unicast sessions. We propose a distributed

scheme that obviates the need for synchronization and

is robust to random packet loss and delay, and so on.

The scheme is simple and incurs minor overhead.

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