Ntt Docomo, Inc.

Xiaoning He

Daichi Funato

Carl Edward Williams

Alper E Yegin

A communications protocol in a system such as an IEEE 802.11 wireless LAN multi-hop system providing transmission scheduling information is disclosed. The transmission scheduling is formatted within a CF&#x2212;Poll+Data+SIPS data frame transmitted by the point coordinator (PC) which may be any one of the access point (AP) nodes transmitting in turn as dictated by the scheduling parameters within the scheduling information parameter set (SIPS). The SIPS comprises an offset field, the time left for the presently functioning PC; a delay field, where an AP delays functioning as a PC; and the interval field, the time allowed for an AP to function as a PC. The subsequent scheduling of assigned transmission slots by providing boundaries for the transmission frames through SIPS eliminates collisions resulting from multiple units transmitting simultaneously, thereby supporting interactive media and voice communications on WLAN multi-hop systems.

Point coordinator control passing scheme using a scheduling information parameter set for an IEEE 802.11 wireless local area network

The present invention provides network-layer authentication protocols for authenticating mobile client and access router to each other. The present invention uses Router Discovery as a carrier to implement the authentication protocols. In an embodiment of the present invention, a mobile client sends out a solicitation message to request connectivity service. The solicitation message contains a proof of identity of the mobile client. An access router that receives the solicitation message will not respond to it until the proof of the identity is verified. Only when the proof of identity of the mobile client is verified, will the access router respond and return an advertising message to the mobile client, thereby preventing unauthorized mobile clients from obtaining network access.

Growing community of inventors

Sunnyvale, CA, United States of America

Xiaoning He