US 20090290572A1
(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2009/0290572 A1
(43) Pub. Date:
Gonia et al.
(54)
SYSTEM AND METHOD FOR TIME
NOV. 26, 2009
Related US. Application Data
iéqqgg?gglzATloN IN A WIRELESS
(60) Provisional application No. 61/055,817, ?led on May
23, 2008.
(75)
Inventors:
Patrick S. Gonia, MapleWood, MN
(US); Soumitri N. Kolavennu,
Blaine, MN (US); Arun V-
Publication Classi?cation
(51) Int. Cl.
H04] 3/06
(2006.01)
Mahasenan, Tn'vandrum (IN);
(52)
us. Cl. ...................................................... .. 370/350
Ramakrishna S. Budampati,
Maple Grove, MN (U S)
73
(
)
(57)
ABSTRACT
Correspondence Address:
A system includes multiple Wireless nodes forming a cluster
in a Wireless network, Where each Wireless node is con?gured
HONEYWELL INTERNATIONAL INC.
PATENT SERVICES
101 COLUMBIA ROAD, P 0 BOX 2245
to Communicate and exchange data Wirelessly based on a
clock. One of the Wireless nodes is con?gured to operate as a
cluster master. Each of the other Wireless nodes is Con?gured
MORRISTOWN, NJ 07962-2245 (US)
to (i) receive time synchronization information from a parent
node, (ii) adjust its clock based on the received time synchro
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nization information, and (iii) broadcast time synchroniza
tion information based on the time synchronization informa
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n erna Iona nc ’
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tion received by that W1reless node. The time synchromzatlon
information received by each of the other Wireless nodes is
.
.
.
.
.
.
(21) APP1- NOJ
12/464,030
based on time synchronization information provided by the
(22)
May 11, 2009
cluster master so that the other Wireless nodes substantially
Filed;
synchronize their clocks With the clock of the cluster master.
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Nov. 26, 2009 Sheet 1 0f 33
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Nov. 26, 2009 Sheet 3 0f 33
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Nov. 26, 2009 Sheet 6 0f 33
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Nov. 26, 2009 Sheet 17 0f 33
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FIGURE 15A
Sends Delta to @
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CLUSTER MASTER GENERATES OR RECEIVES CLOCK SIGNAL
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CLUSTER MASTER PROVIDES TIME SYNC INFORMATION TO
NODE(S) IN NEXT CLUSTER LEVEL
l
NODES RECEIVING TIME SYNC INFORMATION PROVIDE TIME
SYNC INFORMATION TO NODE(S) IN SUBSEQUENT LEVEL
I
NODES SYNCI-IRONIZED TO CLUSTER MASTER
END
FILIE I6
Patent Application Publication
Nov. 26, 2009 Sheet 18 0f 33
US 2009/0290572 A1
f 1700
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PERFORM OPERATION SUBFRAME OPERATIONS
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CHANGEFREQUENCY
FIGURE 17
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Patent Application Publication
Nov. 26, 2009 Sheet 19 0f 33
US 2009/0290572 A1
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GET CLOCK SYNCHRONIZATION INFORMATION
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FIGURE 18