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:
Aug. 23, 2011
Filed:
Nov. 02, 2007
Shashidhar R. Gandham, Richardson, TX (US);
Ying Zhang, Cupertino, CA (US);
Qingfeng Huang, San Jose, CA (US);
Shashidhar R. Gandham, Richardson, TX (US);
Ying Zhang, Cupertino, CA (US);
Qingfeng Huang, San Jose, CA (US);
Palo Alto Research Center Incorporated, Palo Alto, CA (US);
Abstract
One embodiment of the present invention provides a system that performs a query-based convergecast scheduling in a convergecast network, which includes a base-station and a plurality of nodes. During operation, the system receives a convergecast tree for the convergecast network. Each node in the convergecast tree is associated with a hop-count to the base-station through a specific branch and each node can generate zero or more packets to transmit. Next, the system initializes a query from the base-station, wherein the query is successively propagated to the nodes through the branches. In response to the query, the system computes distributed-timing-information indicating a packet transmission schedule for the nodes. The system next aggregates the distributed-timing-information associated with the nodes toward the base-station through the branches. The system then forwards the aggregated distributed-timing-information to the plurality of nodes. Finally, each node constructs an optimized-convergecast-schedule for the convergecast tree based on the aggregated distributed-timing-information.