Abstract: A method of estimating QoS for making a handoff trigger decision for a remote terminal in a wireless IP network is disclosed. At least a first and second probing packet is generated with an access router from a plurality of access points. The first and second probing packets are then sent from the access routers over a fixed core network having a plurality of routers to a correspondent access router and then back to the access routers. At least one collector packet is also generated and sent to follow the first and second probing packets to gather at least one predetermined QoS parameter from the routers after the first and second probing packets have left the routers. The QoS parameters are then processed with the access routers to make the handoff trigger decision preferentially along with layer two QoS parameters of the wireless hop.

Abstract: In a telecommunication system, paging areas may be automatically reconfigured as required. Paging areas can be adaptively reconfigured in accordance with changes in movement traffic of mobile hosts. The system and method work under a constraint that only a limited number of area IDs are permitted for each paging unit area. Also, the system and method work over heterogeneous access networks. Thus, according to the presently disclosed embodiments, paging areas reconfigure themselves according to changes in movement traffic of mobile hosts.

Abstract: A cache handoff system for managing cacheable streaming content requested by a mobile node within a network architecture is disclosed. The network architecture includes a first subnet and a second subnet. The cache handoff system includes a first caching proxy operable in the first subnet to supply a content stream in response to a request of the mobile node operable in the first subnet. In addition, the cache handoff system includes a second caching proxy operable in the second subnet. The first caching proxy may initiate a cache handoff of the request to the second caching proxy when the mobile node relocates to the second subnet. The second caching proxy may seamlessly continue to supply the requested content stream as a function of the cache handoff.

Abstract: The present invention provides a tunnel-based IP handoff process that can minimize the handoff latency associated with the standard Mobile IP registration. In the present invention, when neighboring nodes are detected, these detected nodes are identified as candidate nodes. Detection of just the existence of neighboring nodes should be possible even in situations where these neighboring nodes use different access technologies. For instance, pilot beacon signals may be taken as indication of the existence of candidate nodes although it may be impossible to compare them quantitatively if the beacon signals emanate from different access technologies. As soon as candidate nodes are identified, tunnels are established between the source node and the candidate nodes. The tunnels are used to forward data to the mobile node after a communication link between the mobile node and the source node goes down.

Abstract: A method and system for providing an adaptive IP handoff triggering system for a wireless communication system that consists of either the same or heterogeneous wireless access technologies. A mobile node is notified of at least one pre-trigger timing parameter by a current access network. At least one variable handoff threshold is constructed with the mobile node based on the at least one pre-trigger timing parameter. An IP handoff is then initiated to a candidate access network when pilot beacon signal strength of the mobile node reaches the variable handoff threshold.

Abstract: In the present invention, a tunnel is set up between two mobility serving nodes, source and target nodes. The tunnel is used for communication between a mobile node and the source node after the mobile node completes an L2 handoff from the source node to the target node but before completing the standard Mobile IP L3 registration process or undergoing IP routing update with the target node. The tunnel may be set up either before or after the mobile node completes the L2 handoff from the source node to the target node. Also, the tunnel may be set up by a trigger that is generated either externally or internally of the mobile node.

Abstract: Networks consist of administrative domains each including an administrative server and at least one mobility agent deployed therein. The mobility agents offer connectivity to a mobile node via Advertisement messages in a form verifiable by the mobile node. Each Advertisement message is signed by a private key of the advertising mobility agent and accompanied by a certificate that contains a public key of the advertising mobility agent and is signed by a private key of the administrative server of the advertising mobility agent. Thus, if the mobile node has the public key of the administrative server, it can authenticate the Advertisement message. If the mobile node does not have the public key, it requests the public key when it registers with the mobility agent. The public key of the administrative server is sent in a certificate signed by the private key of the administrative server ultimately responsible for authentication of the mobile node.

Abstract: A geographically adjacent access router discovery system discovers geographically adjacent access routers through a distributed process in which mobile node(s) associated with a current access router may receive beacon signals from geographically adjacent access points. A link layer ID included in the beacon signals may be used by the system to identify corresponding geographically adjacent access routers. Network layer addresses of geographically adjacent access routers may be mapped to corresponding link layer IDs and, cached by the system. The cache may be used to identify a network layer address from the link layer ID received in a beacon signal.

Abstract: A method for providing a triggering mechanism in an all-IP wireless communication system. A plurality of communication paths are established between a mobile terminal and a correspondent node to obtain at least one QoS parameter associated with each communication path. Each communication path that provides a predetermined acceptable level of performance is then identified. A handoff trigger is then generated to the communication path that provides the highest level of performance to the mobile terminal.

Abstract: A method and system for providing a handoff trigger in a wireless communication system. A mobile handoff prediction is generated with a mobile node. At least one handoff prediction is generated with at least one access network within radio range of the mobile node. The mobile handoff prediction and the at least one network handoff prediction are transmitted to a network control server. A handoff is initiated if the mobile handoff prediction and a respective one of the at least one handoff predictions match.

Abstract: A method and apparatus for recognizing the topic structure of language. Language data is divided into simple sentences and a prominent noun portion (PNP) extracted from each. The simple sentences are divided into blocks of data dealing with a single subject. A starting point of at least one topic is detected and a topic introducing region of each topic is determined from block information and language data characteristics. A PNP satisfying a predetermined condition is chosen from the PNPs in each determined topic intro. region as the topic portion (TP) of the topic in the topic intro. region. A topic level indicating a depth of nesting of each topic and a topic scope indicating a region over which the topic continues is determined from the TP and sentences before and after the TP. Sub-topic intro. regions in the remaining area where no topic intro. regions are recognized are determined from block information and language data characteristics.