Abstract: Service discovery systems over MANETs have to face node's frequently movement, random joining or leaving, and services revoked by their owners, therefore it is a big challenge to find available services at a reasonable cost.In order to meet above challenges and improve the adaptability of the system, we proposed a system SCN4M-DL, which adopts directory-less architecture. Coupling with underlying geographical routing algorithm,we designed and implemented a ring-based service register and discovery mechanism, which leads to high success rates of discovery rectuest and also can efficiently control memory costs and network traffic. The experimental results show that SCN4M-DL can adapt well to MANETs' characteristics and the changes of service states.

Key words: Service discovery, MANET, Adaptive