The present invention can be used to facilitate the integration of wireless capability provided by wireless access points into an enterprise computer network. A gateway server is interposed between wireless access points and protected networks to provide security and integration functions, for example, authentication, access control, link privacy, link integrity, and bandwidth metering in various embodiments. Use of such a gateway server allows substantial control to be gained over network access even with the use of relatively simple access points. In general, such a gateway server receives a request to access the protected network. An authentication subsystem of the gateway server authenticates the user, preferably by accessing an external authentication server and returns a role to the authenticated user. An access controller in the gateway server provides differential access to the protected network based on the user's assigned role. A multiple gateway servers can be connected together to form a mesh network architecture.

Method and system for managing data traffic in wireless networks

A gateway server manages connections in a wireless local area network (WLAN). The gateway server provides context information, such as an IP address, that is stored after being previously allocated to a mobile device in a previous connection to the WLAN. The gateway server reassigns the IP address to the mobile device after it reconnects to the WLAN after a disconnection, thus providing seamless roaming for the mobile device from WLAN to WLAN (or subnets within one WLAN) without requiring the user of the device to re-register. The gateway server also provides cluster information (e.g., as part of the context information) for a mobile device making a new connection to the WLAN, such as access privileges associated with the cluster of users of the mobile devices. The gateway server also provides load balancing among two or more WLAN's by directing a newly connection mobile device to another WLAN (or subnet), if less congestion results.

Method and system for enabling seamless roaming in a wireless network

A wireless local area network (WLAN) includes mobile devices that are allowed to transfer wireless connections between WLAN subnets or channels having different access points. The access points connect to a central controller or roaming server that supports seamless hand-offs of mobile devices from one access point to another access point. The roaming server supports the reassignment of session data parameters from one access point to another (e.g., access point address spoofing) so that the mobile device can use the same parameters for communicating to a new access point. The roaming server also supports the seamless handoff of a mobile device from one access point to another by using a master-slave switch technique across two piconets. The roaming server also facilitates the control of access points by establishing a host controller interface and wireless protocol stack in the roaming server and another, complementary wireless protocol stack in the access point. The roaming server then encapsulates host controller commands in a packet based network protocol used for communication between the roaming server and the access points.

Method and system for enabling centralized control of wireless local area networks

A mobile device roams between homogenous or heterogenous wireless networks while maintaining a communication connection with a home network server for the mobile device. A gateway system for a wireless local area network (WLAN) includes gateway servers and manages roaming of a mobile device between homogenous wireless networks. The gateway system maintains a secure connection to a home gateway server for the mobile device while the mobile device roams between homogenous WLAN's. A network gateway manages roaming of a mobile device between heterogenous network systems. The network gateway obtains an access identifier from another heterogenous network system so the mobile device can roam to the other heterogenous network system while maintaining its connection to the home network gateway for the mobile device.

Methods and systems for enabling seamless roaming of mobile devices among wireless networks

This document describes a way to extend Mobile IP Authentication Authorization and Accounting (AAA) signaling to enable a node to request from a network operator combinations of home and local service capabilities (when roaming) in an efficient and scalable manner. It also enables the home and foreign service providers to constrain and account for actual services provided based on a combination of the foreign and home operator policy.

Method for extending mobile IP and AAA to enable integrated support for local access and roaming access connectivity

Providing a network communications system, which extensively supports a mobile terminal. A proxy CN being a router is arranged between a correspondent terminal (CN) and a home agent which directly corresponds to the correspondent terminal (CN). The CN accesses the proxy CN when receiving a service using the Mobile IP. The CN is authenticated by a link layer authenticating server which references a service profile DB, and makes a connection to a network. Communication with a mobile terminal (MN) being a communication partner is made via the proxy CN. In addition, a packet transmission by tunneling is performed by the proxy CN.

Mobile communications system and method thereof

A first edge node accommodating a first IPv6 host holds the service information about the first IPv6 host received from an AAA server, and host address information about the first IPv6 host. A second edge node accommodating a second IPv6 host holds the host address information about the second IPv6 host. The first edge node obtains the host address information about the second IPv6 host from the second edge node when communications from the first IPv6 host to the second IPv6 host are started. The first edge node enables the service information according to the host address information about the first and second IPv6 hosts, and provides the corresponding service.

Service control network

A diagnosis apparatus for discriminating a property of the tissue to be observed from the reflected ultrasonic wave uses the nature of the fine structure of the tissue, and more practically uses the interval of small reflecting bodies dispersely distributed in the tissue as the parameters. The intervals flucatuate. Therefore, an average value and/or a degree of fluctuation is calculated and is displayed. For obtaining the average interval, a method of using the cepstrum of the received signal or a method of using the self-correlation of the received signal can be used.

Ultrasonic diagnosis apparatus for tissue characterization

Providing a network communications system, which extensively supports a mobile terminal (12). A proxy CN (24) being a router (24) is arranged between a correspondent terminal (25) (CN) and a home agent (26) which directly corresponds to the correspondent terminal (25) (CN). The CN (25) accesses the proxy CN (24) when receiving a service using the Mobile IP. The CN (25) is authenticated by a link layer authenticating server (23) which references a service profile DB (27), and makes a connection to a network (20). Communication with a mobile terminal (12) (MN) being a communication partner is made via the proxy CN (24). In addition, a packet transmission by tunneling is performed by the proxy CN (24).

Mobility support for a correspondent node in a Mobile IP network

A linkage information management server includes linkage
information storage means for storing linkage information relating
a first identifier for identifying a first device to a second
identifier for uniquely identifying a second device, registration
means for registering the received first identifier and the second
identifier as linkage information in the linkage information storage
means, and location information storage means for relating and
storing a first address which is an invariable address assigned
for the second device, a second address which is a variable address
assigned for the second device, and the second identifier

o Fujitsu Limited Igarashi

Papers

Mobile communications system and method thereof

Service control network

Ultrasonic diagnosis apparatus for tissue characterization

Mobility support for a correspondent node in a Mobile IP network

Linkage information management system and message transfer control system