"When just the source is an energy constrained node then the link weight is determined by w c ??? ( i , j ) = p r ??? d ij n e ri e m ??? ??? i , [0261] when just the destination is energy constrained then the link weight is determined by w C(i, j)=c 2j +p r ???d ij n, [0262] and when neither end nodes are energy constrained the link weight is determined by w C(i, j)=p r ???d ij n. [0263] This basi" . . . .