Dynamically reserved slot management (DRSM) for packet radio networks

Dynamically reserved slot management (DRSM) is a dynamic, distributed slot management protocol for time-division-multiple-access (TDMA)-based packet radio networks, residing at the network layer of the International Standards Organization (ISO) open systems interconnect (OSI) reference model. The authors discuss the functions and implementation of the DRSM protocol and present some simulation results. DRSM supports multiple ownership of a single TDMA slot, resulting in increased effective bandwidth and throughput. In DRSM, any slot not currently owned by another node within a two-hop connectivity radius is available to be reserved, should it be needed. A key feature of DRSM is that a slot change is made in advance (reserved) during a slot already owned (such as a TDMA slot). Thus, most slot contentions are resolved as reservation contentions, which requires the concurrence of one's neighbors before using a shared slot, rather than transmission contention and collision.<>