International Business Machines Corporation

Luke Wong

Norman Howard Cohen

Apratim Purakayastha

Danny L Yeh

Danny Lo-tien Yeh

A framework of a service directory that can handle service records changing rapidly is provided by using a content-based routing network. A directory node for providing the service directory is called a data resolver. The data resolver listens for service advertisements for certain service categories from service providers, and stores such advertisement data in the form of service records in a local cache. If a data resolver receives a query for some services, it first looks in the cache. If the cache contains at least one service record that satisfies the query, the data resolver returns the record. Otherwise, the data resolver issues a secondary query corresponding to the query it received, to other data resolvers connected by the content-based routing network. Simultaneously, the data resolver begins listening for service advertisements (service records) from other data resolvers on the content-based routing network.

Method and apparatus for discovery of dynamic network services

A method, system, and apparatus for handing-off data receivers in a broadcast-based data dissemination environment. Data receiver hand-off is carried out between data sources in different data cells broadcasting information of the same category. Furthermore, data cell ranges are based on geographic regions rather than signal strength coverage. Generally, the hand-off process involves acquiring the current receiver location of the data receiver and comparing the receiver location with a current data cell range. If the current receiver location is outside the current data cell range, a hand-off controller searches for a new data source encompassing the current receiver location coordinates and having an associated data topic matching the current topic. Once a new data source is found, the hand-off controller subscribes the data receiver to the new data source.

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Norwood, NJ, United States of America

Luke Wong