A New Sufficient Condition for...

چکیده مقاله

An  effective  approach  for  energy  conservation  in
wireless sensor networks is scheduling sleep intervals
for extraneous nodes while  the remaining nodes stay
active  to provide  continuous  service. For  the  sensor
network to operate successfully the active nodes must
maintain  both  sensing  coverage  and  network
connectivity,  It  proved  before  if  the  communication
range  of  nodes  is  at  least  twice  the  sensing  range,
complete  coverage  of  a  convex  area  implies
connectivity among  the working  set of nodes.  In  this
paper  we  consider  a  rectangular  region A = a *b ,
such  that R a R b s s £ , £ ,  where s R is  the  sensing
range  of  nodes.  and  put  a  constraint  on  minimum
allowed  distance  between  nodes( s R ).  according  to
this  constraint  we  present  a  new  lower  bound  for
communication  range  relative  to  sensing  range  of
sensors( s 2 + 3 *R )  that  complete  coverage  of
considered  area  implies  connectivity  among  the
working  set  of  nodes;  also  we  present  a  new
distribution method , that satisfy our constraint.