The emergence in recent years of a new generation of mobile computing devices suggests that indoor wireless LAN’s will play an increasingly important role in our telecommunication infrastructure, particularly in traditional office settings where the demand for such mobile communication will be highest. The media in such indoor wireless LAN’s is a shared, and scarce, resource; thus, controlling access to this media is one of the central design issues in wireless LAN’s. In this paper we have discussed the design of a new media access protocol for wireless LAN ‘s: MACAW. It is derived from Karn’s earlier proposal, MACA [9]. Our design process relied on four pieces of insight.