Nec Corporation

Nec Usa, Inc.

Subir K Biswas

Dipankar Raychaudhuri

Gopalakrishnan Ramamurthy

Rajiv S Dighe

Rauf Izmailov

Ruixi Yuan

Bhaskar Sengupta

Arup Acharya

Kojiro Watanabe

Samrat Ganguly

Jun Li

Vasanthi Thirumalai

A system and method for path provisioning in a network calculates an optimal path using a greedy algorithm with backtracking to execute service level agreements (SLAs). More specifically, a sequential path shifting (SPS) algorithm compares a cost of a suboptimal path for a present quadruplet with the cost of switching a path for a previous quadruplet configured for alteration. If the present path is already an optimal path, then no further operations are performed. However, if the cost of a suboptimal path is greater than the switching cost, the previous path is altered so that an optimal path may be configured for the present quadruplet. Otherwise, the present quadruplet maintains its existing path. The capacity of the network is iteratively adjusted to compensate for path selection. The present system may be applied to a differentiated services network or an optical network.

Path provisioning for service level agreements in differentiated service networks

A technique for reducing ATM call blocking is provided that splits wideband connections into multiple low-bandwidth sub-connections and routing them independently through the network. Fragmented network bandwidth is used for supporting calls which are otherwise blocked by conventional routing. A detailed cell-level design for the split scheduling algorithms is provided. A system for implementing splitting without requiring any protocol changes within the network is provided. Such a system modifies the control plane protocols only within the end-stations.

Connection splitting: an efficient way of reducing call blocking in ATM

The present invention pertains to message sets for use in a flexible programmable multiplexer for accessing an Asynchronous Transfer Mode (ATM) network. The access multiplexer uses a functional separation of line related functions and protocol related functions. Line interface cards perform line related functions. A message set for use in such a multiplexing system that uses a functional separation of line and protocol related functions is provided. The message set includes a general message, a hello message, a configuration message, a line stabilized message, an identify remote message, an identify remote acknowledgement message, a reset remote message, a report statistics message, a report statistics acknowledgement message, a loopback test message and a dynamic rate adaptation message. A flexible programmable multiplexer that uses the message set is also provided.

Message sets for a flexible programmable ATM access multiplexer using

Mobility in a wireless ATM network is accomplished by use of hand-off control protocols. A mobile terminal signals a first base station that a hand-off is to occur. In a first preferred embodiment the first base station signals a second base station requesting a hand-off. After the second base station signals the first base station that a datapath link is available from a hand-off switch to the second base station, the hand-off switch causes the datapath to change from the first base station to the second base station and the first base station signals the mobile terminal to commence communication with the second base station. In a second preferred embodiment, the mobile terminal signals a first base station that a hand-off is to occur. The first base station signals a second base station requesting a hand-off. At the same time a datapath link is established between the first and second base stations. When the second base station signals the first base station that the datapath link is available, the first base station signals the mobile terminal to change to the second base station and data is sent from the first base station to the second base station via the available established datapath link.

Handoff-control technique for wireless ATM

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Plainsboro, NJ, United States of America

Subir K Biswas