ABSTRACT
Wireles s se nso r n e twor k i s an emergi n g n etw ork tech nol ogy, it combines sen so r
technology、embedded computer technology、distributed information technology and
wireless communications technology. It consists of a lot of sensor nodes that deployed
i n t h e m o n i t o r i n g a r e a , t h e y c o o p e r a t e w i t h e a c h o t h e r p e r c e i v e d、c o l l e c t e d a n d
pr o c e ssed t h e info r mation o f perc e i ved o b j ect th a t cover e d by n e twork , a nd se n d the
information to the observer. In wireless sensor network, routing technology is the core
and key technology, and in the network design as a very important role.
Th e m a i n c o n t e n d o f t h i s p a p e r i s t h e d e s i g n o f r o u t i n g p r o t o c o l t h a t b a s e d o n
geographical location. There have a lot of nodes in wireless sensor network, signal node
w i t h v e r y l i m i t e d r e s o u r c e s , s o t h e f i r s t g o a l o f r o u t i n g p r o t o c o l i s i m p r o v e e n e r g y
e f f i c i e n c y a n d e x t e n d t h e n e t w o r k l i f e c y c l e . G P S R r o u t i n g p r o t o c o l d i r e c t l y u s e
ge o g r aphic i n form a t ion as t h e ba s i s for s e l ect r o u ting. It u s e s gre e d y for w a rding a nd
boundary forwarding send data packet. When the source node has packets need to send,
first using the way of greedy forwarding to send the data packets, if the data packets
faced with Void, the routing protocol will turn to boundary forwarding that based on
right hand rule. When the data packet bypassed the Void, the routing
protocol will re-mark the forwarding method to greedy forwarding, until the data packet
received by destination node. This paper analyzed the blind detour and triangle routing
problem in GPSR routing protocol, introduced an improved GPSR routing protocol that
used Landmark idea, improved protocol established a Landmark Cache for every node
in the network, been used for store the information of Landmark that forwarded nodes,
use Landmark information we can solve the problem of blind detour and triangle routing
well. In this paper, based on the improved protocol that used Landmark idea presented
an improved scheme, set the value of N in the header field, to solve the problem of
missing link when the key node failure.
Fin ally, Sim u lat ed GPSR in the OPNET p latform . Sim ulat ion res ults shows tha t
GPSR can effectively reduce the routing hops, and the performance of data send and
receive is very good, can effectively save energy and extend the life cycle of network.
K e y W o r d : W i r e l e s s s e n s o r n e t w o r k , G e o g r a p h i c r o u t i n g p r o t o c o l ,
GPSR, Network Simulation