A new multi-channel, CDMA (Code Division Multiple Access) (or FDMA (Frequency Division Multiple Access)) and TDMA (Time Division Multiple Access) combined, contention free MAC (Medium Access Control), termed the Sequenced Neighbor Double Reservation (SNDR), is presented for mobile ad hoc networks. The SNDR uses the receiver-based data transmission strategy, based on which two methods are proposed. One is contention-based and the other is contention-free. In this paper, we put emphasis on the

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... tention-free type (SNDR). On the other hand, the contention-based MAC, which needs further research, is also briefly discussed. The SNDR does not need any handshake process (such as Request to Sendclear to Send (RTSKTS) handshake) or any carrier sensing technology. It uses the neighbor sequenced method to avoid contentions and the double reservation method to improve the total throughput of ad hoc networks. No hidden or exposed terminal problem will exist in the SNDR. No collision will occur and no time slot will be wasted in the SNDR MAC frame. The protocol can be efficiently applied to the multichannel ad hoc networks. The performance of the SNDR is analyzed carefully. Some future work and applications are also discussed.