Aiming at single radio multi-channel MAC protocol\'s problems,such as the requirement of time synchronization and lots of orthogonal channels,large number of multi-channel hidden terminals,loss of single-hop multi-channel broadcast data,etc,the authors propose a competition based multi-channel MAC protocol,called HM-MAC,to tackle those problems for wireless sensor network.

Most of current works on multi-channel MAC are based on simulations,and lack of performance analytical model.

As multi-channel communication protocol becomes a hot research area with the fast development of wireless communications, it results in much more requirement of multi-channel protocol simulation.

S-MAC protocol with service differentiation;

This paper analyzes the working process of S-MAC protocol and the principle of backoff algorithm.

While S-MAC protocol combines advantages of fixed allocation category and random competition category of MAC protocol,and its main design goals are energy efficiency and expansibility.