Receiver Initiated Multiple Access for Ad Hoc Networks

Tech ID: 10192 / UC Case 2000-360-0


As the use of wireless systems become increasingly important, attention is being focused on a variety of popular wireless network protocols, such as the medium-access control (MAC) protocol. Current MAC protocols for wireless networks are based on collision-avoidance handshakes between the sender and receiver. Most of these systems are based upon a sender-initiated handshake, in which the sender uses a short control packet to ask the receiver for permission to transmit packets. Thus, the sender only transmits packets if the receiver sends a clear-to-send notification. However, under high-traffic conditions, an influx of control packets can adversely affect the network. Therefore, a need exists for a wireless protocol that can benefit the receiver, while avoiding packet collision within the network.  

Technology Description

Scientists at the University of California have developed a novel single-channel, contention-based medium access protocol that reverses the traditional RTS-CTS collision avoidance handshake. This receiver-initiated approach results in more efficient collision avoidance protocols.


  • Wireless networks


  • Highest level of MAC protocol efficiency

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 6,996,074 02/07/2006 2000-360


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  • Garcia-Luna-Aceves, Jose Joaquin(JJ

Other Information


Wireless networks, ad-hoc networks, medium-access control, MAC, high-traffic networks, RTS-CTS collision, receiver access, Cat3

Categorized As