Dynamically Reserved Slot Management (DRSM) for Packet Radio Networks

摘要

Dynamically Reserved Slot Management (DRSM) is a dynamic, distributed slotmanagement protocol for time division multiple access (TDMA) based packet radio networks (PRNs), residing at the Network Layer of the International Standards Organization (ISO) Open Systems Interconnect (OSI) reference model. DRSM addresses some issues of the slot management problem: how a node gains ownership of a slot, gives up a slot, and resolves contention for a slot. 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. Thus, most slot contention is resolved as reservation contention,' depending on the concurrence of one's neighbors for use of a shared slot, rather than transmission contention and collision. This paper discusses the functions and implementation of the DRSM protocol, and presents some simulation results.