Abstract: A proxy directory server discovers the topology of distributed directory server immediately after starting up and before accepting client requests. Immediately after starting up, the proxy server executes queries to extract the structured data corresponding to directory distribution information from the distributed directory servers. Dynamic topology reconfiguration of the distributed directory is achieved by any dynamic configuration changes made to the topology information directly at the proxy during operation being propagated by means of directory update operations to the distributed directory servers.

Abstract: A replication model has replicas store selected entries from subtrees. Only entries satisfying a particular search criterion specified by a filter are stored. Query containment is used to determine whether the query can be answered locally, or a referral to a remote server is required.

Abstract: A method for reducing device discovery delays in frequency hopping based ad-hoc networks is disclosed. According to the method, an activity being performed is periodically interrupted to scan for inquiry messages from other devices for a pre-determined period time period. Processing of a received inquiry message, in accordance with normal procedures applicable to the particular frequency hopping based ad-hoc network, occurs after expiry of a random time period. At the end of the predetermined time period, the original activity is returned to. A device for use in frequency hopping based ad-hoc networks that embodies the described method and a computer program product for such a device, are also disclosed.

Abstract: A replication model has replicas store selected entries from subtrees. Only entries satisfying a particular search criterion specified by a filter are stored. Query containment is used to determine whether the query can be answered locally, or a referral to a remote server is required.

Abstract: A framework for answering Lightweight Directory Access Protocol (LDAP) queries from previously cached queries includes a proxy server configured to receive client directory queries. The proxy server maintains a cache of data (entries) and semantic information associated with a query. In response to a query received from client, the proxy invokes a query containment procedure which uses the semantics of the incoming and stored queries to determine whether the query can be answered from cached queries. The proxy answers queries from the local cache when possible, and for other queries it sends the request to a directory server. The semantics of the new query and the resulting data (entries) are added to the cache. The method and apparatus can be used for positive conjunctive queries for answering equality, range and substring queries.

Abstract: A system, method, and computer program product for carrying out the method for managing power consumption in a master driven time division duplex wireless network comprising optimizing power consumption while maintaining quality of service requirements for end-to-end packet delay by adjusting the polling interval for each slave in low power mode based on the incoming traffic at the slave.

Abstract: A framework for answering Lightweight Directory Access Protocol (LDAP) queries from previously cached queries includes a proxy server configured to receive client directory queries. The proxy server maintains a cache of data (entries) and semantic information associated with a query. In response to a query received from client, the proxy invokes a query containment procedure which uses the semantics of the incoming and stored queries to determine whether the query can be answered from cached queries. The proxy answers queries from the local cache when possible, and for other queries it sends the request to a directory server. The semantics of the new query and the resulting data (entries) are added to the cache. The method and apparatus can be used for positive conjunctive queries for answering equality, range and substring queries.

Abstract: A method for reducing device discovery delays in frequency hopping-based ad-hoc networks is disclosed. According to the method, an activity being performed is periodically interrupted to scan for inquiry messages from other devices for a pre-determined time period. Processing of a received inquiry message, in accordance with the normal procedures applicable to the particular frequency hopping based ad-hoc network, occurs after expiry of a random time period. At the end of the pre-determined time period, the original activity is returned to. A device for use in frequency hopping based ad-hoc networks that embodies the described method and a computer program product for such a device, are also disclosed.

Abstract: Media Access Control (MAC) Scheduling for Quality of Service (QoS) uses the bandwidth and delay requirements of a connection to calculate the polling interval, which is the maximum time that the scheduler can be away from the connection. The methodology involves deadline-based scheduling and adapts deadlines based on the number of packets actually arriving to take advantage of any excess bandwidth that is available.

Abstract: Disclosed is a system for minimizing the effects of faults over an air link of a wireless transmission channel utilizing Transport Control Protocol (TCP). The system includes a TCP-Aware Agent Sublayer (TAS) in a protocol stack, which has a mechanism for caching both TCP packets during forward transmission and acknowledgment (ACK) return packets. The caching mechanism is located near a wireless link of the wireless transmission channel. The system also includes a link monitoring agent coupled to the TAS. The link monitoring agent monitors the condition of the wireless transmission channel for an occurrence of a predefined fault. Once a predefined fault is detected, a system response is implemented based on the type of fault encountered. When the fault is an air link packet loss, an associated packet is immediately retransmitted from the cache, and when the fault is a temporary disconnect, a congestion window of the TCP source is closed.