QCRA-a packet data multiple access protocol for ESMR systems

A high performance packet data link protocol has been designed for enhanced special mobile radio (ESMR) systems using the Motorola integrated radio system (MIRS) technology to provide packet data services for wireless mobile computing applications. The paper describes a new multiple access data protocol, queued contiguous reservation aloha (QCRA), designed for packet data services in ESMR systems. QCRA extends the concepts of reservation aloha to include reservation queueing and allocation of contiguous time slots within the context of a TDM land-mobile radio data system such as MIRS. These extensions provide the efficiency advantages of reservation aloha while providing improved delay performance during conditions of light channel load. It is shown via analysis and simulation that this new protocol is highly efficient and well-suited to a wide range of land-mobile data system applications.