A Handoff Examination of a Hybrid System Using Cellular and Ad-Hoc Modes

Tomoko ADACHI, Masao NAKAGAWA

Summary :

A hybrid system in which mobile terminals (MTs) themselves select whether to communicate directly or via base stations (BSs) from communication conditions, "cellularad-hoc united communication system," has been proposed by the authors. It has been confirmed to have effective channel usage and battery consumption, especially for MTs which tend to communicate with partners which are close together, such as operational mobile robots. In this paper, the hybrid system is examined with respect to handoff rate. This hybrid system uses two modes, a cellular mode and an ad-hoc mode. The former mode is for communication using BSs and the latter is for direct communication. Thus, there will be two kinds of handoffs. One is the ordinary one between BSs and the other is between the two modes. Such a system may suffer from frequent handoffs. Thus the handoff rate of the system was examined. However, by the addition of a simple hysteresis characteristic, the handoff rate was held down closer to that of a pure cellular system in a multipath environment.

• Publication: IEICE TRANSACTIONS on Communications Vol.E83-B No.11 pp.2494-2500
• Publication Date: 2000/11/25
• Type of Manuscript: PAPER
• Category: Wireless Communication Switching

Authors

Tomoko ADACHI
Masao NAKAGAWA

Keyword

cellular system,  ad-hoc communication,  operational mobile robot