| NEC COMMUNICATION SYSTEMS, LTD. Patent applications |
| Patent application number | Title | Published |
|---|
| 20090149222 | WIRELESS BASE STATION, COMMUNICATION SYSTEM, BELONGING INFORMATION MANAGEMENT METHOD AND STORAGE MEDIUM FOR STORING PROGRAM - The present invention is to allow prompt and reliable synchronization of belonging information management table even in environments where there is a possibility of receiving update notification information from a plurality of wireless base stations, without needing unnecessarily large traffic for synchronization of belonging information management table. Wireless base station stores belonging information management table, to which belonging information of a terminal belonging to the base station is associated with, to new/old judgment information for judgment of new/old of update. Belonging information update unit performs update of belonging information including the new/old judgment information thereof. Further, upon receiving update notification information from other wireless base station, the belonging information update unit updates the belonging information management table based on the update notification information. The update notification information includes at least updated portion in the belonging information and new/old judgment information. | 06-11-2009 |
| 20090146866 | WIRELESS APPARATUS, WIRELESS COMMUNICATION SYSTEM, CONTROL METHOD, AND CONTROL PROGRAM - A wireless apparatus which can realize a DFS function that avoidance of interference with radar is considered in an Ad-Hoc mode under a multihop circumstance is provided. A Beacon frame is transmitted at a shorter interval than a previously set interval when radar is detected by wireless apparatuses N | 06-11-2009 |
| 20090109901 | WIRELESS DEVICE WHICH SELECTS ROUTES EXCLUDING LOOP ROUTES AND A MESH NETWORK INCLUDING THE SAME - In wireless communication using links with neighbor wireless devices, a wireless device calculates ratios of throughput to maximum throughput for the links and calculates the costs of the links using the calculated ratios. Then the wireless device finds, for each destination, a route in which the sum of such calculated link costs is the minimum, and sends a packet to the destination using the route. As a consequence, routing can be done according to an isotonic, easy-to-implement routing protocol. | 04-30-2009 |
