IEEE 802.15.4-2003 is a standard for Low rate, Low powered, Low memory wireless personal area network (WPAN). The Physical layer (PHY) and Medium access control (MAC) specification has been given by IEEE [12, 11]and the Network layer by ZigBee Alliance[17]. They support two kind of net work Tree/Mess. In tree network no routing table is required for routing. After the great success in PAN this technique has also been tried to apply in business Network too. The main problem with this routing is that the maximum length of the net work is 16 hops and in some cases the network can not grow because of the exhaustion of address in some part while the other part is very poorly loaded. Here In this paper we have provided a unified address borrowing scheme which can be easily applied to grow the network beyond 16 hops and overcome the address exhaustion problem by borrowing address.
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