Horology: time measuring systems or devices – Plural timepiece system or system device
Reexamination Certificate
2006-10-10
2006-10-10
Miska, Vit W. (Department: 2841)
Horology: time measuring systems or devices
Plural timepiece system or system device
C368S047000, C370S350000, C370S509000, C375S356000
Reexamination Certificate
active
07120092
ABSTRACT:
A clock synchronization method and apparatus is disclosed for use in a communication system including a plurality of wireless nodes communicatively coupled via a wireless network, each of the plurality of wireless nodes having a local time base, and one of the plurality of wireless nodes being designated as a master node having a master time base which serves as a master clock against which the local time bases are synchronized. The clock synchronization method includes the steps of periodically transmitting synchronization frames to the plurality of non-master nodes so as to adjust the slave clocks associated with the respective non-master nodes. The synchronization frames are distributed from the master node at near-periodic intervals and includes a cycle time value that corresponds to the end of the previously transmitted synchronization frame. The slave clocks (i.e., non-master nodes) receiving the synchronization frame determine the cycle time value at the point of reception of the synchronization frame and adjusts their clocks by calculating a difference value between the received cycle time and a previously saved local cycle time value.
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Bennet Jeff
Choi Sunghyun
del Prado Pavon Javier
Nandagopalan Sai Shankar
Sato Takashi
Koninklijke Philips Electronics N. V.
Miska Vit W.
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