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:
Feb. 08, 2011
Filed:
Nov. 15, 2006
Avinash Joshi, Orlando, FL (US);
Manish Shukla, Sr., Altamonte Springs, FL (US);
Avinash Joshi, Orlando, FL (US);
Manish Shukla, Sr., Altamonte Springs, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A hybrid TDMA-CSMA MAC protocol is provided for allocating time slots within a frame having a structure in which transmission time is divided into a first number of actual TDMA time slots and a second number of 'virtual' CSMA time slots. Each of the nodes in a multi-hop network can transmit a Highest Slot Number (HSN) field. Each time one of the Hello messages is received from a neighbor node, a given node can calculate variables based on the HSN field. The given node can use these variables to calculate a ratio of the first number to the second number. This ratio can be dynamically adjusted depending upon the traffic conditions observed by nodes within the multi-hop ad hoc network at any particular time to thereby change the relative percentages of the frame which are allocated for a TDMA portion and a CSMA portion of the frame.