Skip to main content
Open Access Publications from the University of California

UC Santa Cruz

UC Santa Cruz Previously Published Works bannerUC Santa Cruz

Carrier-Tone Multiple Access with Collision Avoidance and Detection


A new approach for collision avoidance and collision detection in ad-hoc networks of nodes with half-duplex radios is introduced. Rather than using a single busy tone indicating that a receiver is busy, three types of carrier tones sent by receivers or passive listeners indicate that an intended receiver is busy receiving or acknowledging a data packet, or a passive listener has detected a collision. All carrier tones are sent over a single control channel, and the data channel is used only for data and request-to-send (RTS) packets. The Carrier-Tone Multiple Access with Collision Avoidance and Detection (CTMA/CAD) is described and its performance is compared with the performance of DBTMA in a hidden-terminal scenario. The results of the analysis show that CTMA/CAD is a more efficient channel-access method for networks with hidden terminals.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View