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Exploiting Overlapped Bands for Efficient Broadcast in Multi-channel Wireless Networks


In wireless networks, broadcasting is a fundamental communication primitive for network management and information sharing. However, in multi-channel networks, broadcast efficiency is very poor as devices are distributed across various channels. Thus, a sender tries all channels to broadcast a single message, causing large overhead. In this paper, we propose a novel, drastically different scheme for efficient broadcast in multi-channel networks. Our scheme leverages an overlapped band of adjacent channels, the frequency range that partially overlapped channels share within their channel boundaries. Specifically, a sender advertises a rendezvous channel through the overlapped band of adjacent channels; message sharing is done on the rendezvous channel. Our scheme employs Signaling via Overlapped Band (SOB), which defines a new signal processing mechanism for communication via the overlapped band. SOB is integrated with the following MAC layer mechanisms: 1) Reserve Idle Spectrum Fragment (RISF) to reduce waiting time, 2) Multi-sender Agreement on Rendezvous CHannel (MARCH) to support multi-sender broadcasts, and 3) Reinforce Switch Notification (RSN) to reduce the residing time at a wrong channel. Our scheme can also be integrated with two remarkably simple but efficient mechanisms for improving PDR and reducing delay in a multiple contention domain. We implemented our scheme on the SORA software radio platform. Experimental results validated communication through the overlapped band. Intensive simulation studies showed that our scheme dramatically outperformed a previous approach.

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Information & Date

IEEE Transactions on Vehicular Technology, , September. 2016


Jae-Han Lim
Katsuhiro Naito
Ji-Hoon Yun
Mario Gerla