Rensselaer Polytechnic Institute

At&t Intellectual Property I, L.p.

At+t Corp.

Hubbell Limited

Shivkumar Kalyanaraman

Kadangode K Ramakrishnan

Vijaynarayanan Subramanian

Omesh Tickoo

Boleslaw Szymanski

David Harrison

Jiang Li

Dibyendu Shekhar

Bin Mo

Koushik Kar

Biplab Sikdar

Jingjie Jiang

Fnu Sidhartha

Ye Tao

Kalyan R Kidambi

Vicky Sharma

Neelkanth Natu

Priya Rajagopal

Kenneth Vastola

Puneet Thapliyal

A particular device includes a transmitter. The transmitter is adapted to estimate a packet erasure rate for packets of a data window to be transmitted to a receiver. The transmitter is adapted to determine a number of proactive forward error correction (FEC) packets for the data window based on the estimated packet erasure rate. The transmitter is adapted to determine a packet size for the packets in the data window based on a window size of the data window and the determined number of proactive FEC packets. The transmitter is also adapted to transmit the data window to the receiver. The packets in the transmitted data window have a size corresponding to the determined packet size and include the determined number of proactive FEC packets.

Loss tolerant transmission control protocol

A transport protocol that achieves improved performance in an environment where paths are lossy and a plurality of paths are employed to transfer data, essentially in parallel, from a source to a destination. The protocol is implemented with the aid of an aggregate flow manager (AFM) at the source that considers and controls the data flow through the plurality of paths. With some preselected regularity the AFM determines a number of packets to be included in a Forward Error Correction (FEC) block of packets, creates the block, and transmits the segments of the block over the plurality of paths. As necessary, the destination sends information to the source of what additional information needs to be sent. This additional information might be reactive error correcting (RFEC) packets, or a retransmission of the missed packets.

Transport protocol for efficient aggregation of heterogeneous lossy paths

Provided are apparatuses and methods for transmitting or receiving data packets in a data block in a communication network with a transport protocol. In one example, a loss tolerant TCP protocol is used in which a maximum segment size (MSS) may be adapted to a minimum granularity of a congestion window. Also, proactive forward error correction (FEC) packets may be added to a window of the data block. The number of proactive FEC packets may be determined, for example, based on an estimate erasure rate. In addition, reactive FEC packets may be added to the data block. Also, a receiver may receive data packets in a data block and process a selective acknowledgment (SACK) responsive to the data packets received.

A collaborative on-line simulation system and method to provide automated and pro-active control functions for computer network. In a wide area network, clients communicate through one or several nodes (). Each node () contains routers which include control plane () and data plane (). Collaborative on-line simulators () are interfaced to the network nodes () and continuously monitor the surrounding network conditions, communicate with other simulators and execute collaborative on-line simulation. Based on the simulation results, the on-line simulators () continuously tune selected network parameters to a more efficient operation point to fit the current network conditions.

Network management and control using collaborative on-line simulation

The present invention provides for a method of congestion control for multicast transmission that is entirely managed at the source of the transmission. The various types of filters as well as round trip time estimators () that are used in the invention to determine when the rate of the multicast transmission should be reduced to alleviate congestion. The source of the transmission adjusts the rate of transmission based on loss indications that the receivers would otherwise transmit.

System and method of source based multicast congestion control

A method and system for discarding and regenerating transmission control protocol (TCP) acknowledgment packets (ACKS) transmitted over an asymmetrical digital subscriber line (ADSL) to increase the data transmission rate. When an incoming ACK is received at a first intermediate node located at one end of the ADSL link, the intermediate node determines whether a prior ACK from the same connection/flow (TCP receiver) is presently stored in a queue awaiting transmission. If a prior ACK packet is not presently stored in the queue, the incoming ACK packet is stored in the queue. However, if there is a prior ACK packet in the queue, the information contained in the incoming ACK packet is stored in a per-connection state table and the incoming ACK packet is discarded. When the prior ACK packet is ready to be transmitted to a second intermediate node via the ADSL link, the information contained in the per-connection state table regarding the discarded incoming ACK is copied into the prior ACK. Upon receiving the prior ACK, the second intermediate node regenerates the discarded ACK based on the information contained in the prior ACK.

Method and system for discarding and regenerating acknowledgment packets in ADSL communications

Growing community of inventors

Niskayuna, NY, United States of America

Shivkumar Kalyanaraman