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By creation of the long-lasting clusters, frequent path search is reduced. We are considering the scenario where multiple WBANs are present. Instead of having a connection of each WBAN with RBS, we considered some of the WBANs are not in the range of RBS. Each WBAN consist of one Personal Server (PS) and multiple sensor nodes. The sensor nodes pass their collected data to the PS and this PS is responsible for further transmission. In our purposed technique PS of different WBANs form clusters. Each cluster contains a cluster head and cluster members (CM) in its vicinity. CH is a selected PS of a WBAN within the WBANs of a cluster. Now all other WBANs will be connected to the CH, multiple CHs of different WBANs can have hop-to-hop communication, and this way data is passed to the nearest AP.

Our communication can be classified into following hierarchal groups.

 Sensor node to PS

 PS(CM) to CH

 CH to RBS

Figure 3.2 is describing the actual working of the clustering technique. WBANs of cluster “A” and its CH are not in the range of RBS. But cluster “B” is in the vicinity of RBS, so cluster “B” is capable of communication with RBS. In this case, cluster “A” required the help of cluster “B”. Members of cluster “A” have a direct link with A’s cluster head, further CH-A can establish a connection with CH-B. It is a simple mechanism of clusters communication.

Figure 3.2 Inter-WBAN clustering.