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Ritsumeikan Univ.KO-609
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(A Study on Time Synchronization and Position Identification in Wireless \
Sensor)Tj
15.058 -1.211 Td
(Networks)Tj
/TT1 1 Tf
12 0 0 12 478.3574 742.5 Tm
(Yuichi Tokunaga)Tj
-36.155 -2.313 Td
(In this paper, new method of time synchronization and position identific\
ation in wireless sensor networks is)Tj
-1 -1.5 Td
(described. Many existing methods require a lot of communication packets \
according to the increase in the)Tj
0 -1.5 TD
(number of nodes. The communication band consumption in time synchronizat\
ion and position identification)Tj
T*
(causes obstruction to application communication. In order to overcome th\
is problem, in this paper, new)Tj
T*
(method to achieve efficient utilization of the communication band is pro\
posed. Proposed method consists of)Tj
T*
(three schemes:)Tj
T*
(1\) Optimization of the communication band consumed by time synchronizat\
ion: The communication packets)Tj
T*
(of time synchronization are reduced by controlling relay timing and sele\
cting relay nodes by a receiver node)Tj
T*
(on the basis of the information about neighbor nodes. This scheme can sy\
nchronize time of all nodes by a)Tj
T*
(constant amount of communication packet independently of node density. F\
or this reason, it is possible to)Tj
T*
(suppress the influence on the application communication even if the time\
synchronization is periodically)Tj
T*
(repeated to keep synchronization accuracy.)Tj
T*
(2\) Improvement of stability and accuracy in position identification: Th\
is scheme solves nonlinear)Tj
T*
(simultaneous equations in the multilateration as an initial value proble\
m of the ordinary differential equation.)Tj
T*
(It can identify the node position stably and accurately in comparison wi\
th the least squares solution when)Tj
T*
(anchor node is few. For this reason, it is possible to reduce the commun\
ication packets used to obtain the)Tj
T*
(information of distance between anchor node and target node. )Tj
T*
(3\) Integration of time synchronization and position identification: Thi\
s scheme integrates time)Tj
T*
(synchronization and position identification by applying Time of Arrival \
\(ToA\) and achieves efficient)Tj
T*
(utilization of the communication band. Moreover, the solution can be sta\
bly obtained by using the scheme)Tj
T*
(developed in 2\). In addition, by using the scheme developed in 1\), tim\
e synchronization and position)Tj
T*
(identification can be achieved simultaneously and also number of communi\
cation packets can be decreased.)Tj
T*
(In this paper, details of above three schemes are described, and effecti\
veness of each scheme is also discussed)Tj
T*
(according to the result of actual implementation and computer simulation\
.)Tj
ET
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