The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 2012
Filed:
Aug. 06, 2008
Steven Froehlich, Danbury, CT (US);
Michel H. T. Hack, Cortlandt Manor, NY (US);
Xiaoqiao Meng, Mount Kisco, NY (US);
LI Zhang, Yorktown Heights, NY (US);
Steven Froehlich, Danbury, CT (US);
Michel H. T. Hack, Cortlandt Manor, NY (US);
Xiaoqiao Meng, Mount Kisco, NY (US);
Li Zhang, Yorktown Heights, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A clock offset between a client and a server is measured by: (a) the client sending a request to the server; (b) upon receiving the request in step (a), the server optionally sending a server acknowledgement to the client; (c) upon the client receiving the server acknowledgement in step (b) or directly, if no acknowledgement was used, each of the client and the server proceeding to concurrently exchange their respective timestamps with each other a multiplicity (n) of times, thus forming a multiplicity (n) of timestamp exchanges; and (d) determining a plurality of apparent forwards and backwards delays based on the multiplicity (n) of timestamp exchanges. The preferred apparent forwards and backwards delays are then selected based on the minimum values (for each direction) determined in (d) above. The clock offset between client and server is then determined based on the preferred apparent forwards and backwards delays.