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:
Nov. 08, 2005
Filed:
Aug. 31, 2001
Philip A. Jamieson, Dorking, GB;
Ian A. Marsden, Redhill, GB;
Philip A. Jamieson, Dorking, GB;
Ian A. Marsden, Redhill, GB;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A method of transferring data signals between a primary station () and secondary stations (SLto SL) of a master/slave radio network, comprises the primary station assigning the secondary stations to a plurality of categories (Z, Z). The primary station transmits beacon signals containing indications of those categories of the plurality for which it has data to be transferred. A secondary station operating in accordance with a wakeup sequence receives the beacon signals and determines if there is an indication of its category in a received beacon signal. If so, it transmits a request including an indication of its identity. The primary station checks to see if it has a data packet for the identified secondary station and, if it has, it transmits the data packet and, if not, it transmits a negative acknowledgement. Those secondary stations not participating in the exchange of messages can revert to a sleep mode thereby saving power.