The present invention provides a system for operating a power line communications system that is comprised of a plurality of network elements, which may take the form of repeaters, bypass devices, backhaul devices, wireless backhaul devices, enhanced bypass device, communication interface devices and others. In one embodiment, two groups of network elements in the same electrical distribution system are isolated except selected communication link.

Power line communication system and method of operating the same

The disclosed embodiments include system and method for routing communications over a communications network. In one embodiment, a determination is made as to whether to establish a communication along a communication path based on network performance information. The disclosed embodiments provide several alternatives for establishing the communication and improving communications along the communication path in response to a determination that at least one network node along the communication path is impaired or congested.

System and method for routing data on a packet network

A system for monitoring and optimizing network performance to a wireless device including a wireless router in communication with the wireless device for transmitting and receiving RF signals between the wireless router and the wireless device, the wireless router configured to determine network performance information of the wireless network; concatenate the network performance information into data packets; a packet network switch in communication with the wireless router for communicating the data packets between the wireless router and the packet network switch; and a network management device in communication with the packet network switch for instructing the packet network switch to route the data packets to the wireless router based on the network performance information to optimize the network performance to the wireless device. A method for monitoring and optimizing network performance to a wireless device is also included.

System and method for monitoring and optimizing network performance to a wireless device

A system for adjusting the window size of a TCP packet on a packet network including a sending network element in communication with a receiving network element for transmitting and receiving data packets between the sending network element and the receiving network element on the packet network, wherein at least one of the sending network element and the receiving network element is configured to determine network performance information of the packet network; concatenate the network performance information into the data packets; and adjust the window size of the TCP packet based on the network performance information. A method for adjusting the window size of a TCP packet on a packet network is also included.

System and method for adjusting the window size of a tcp packet through network elements

A system and method for managing subscriber usage of a packet network. The system may include at least one database configured to store network performance information of data packets including real-time content and non-real-time content communicated over a packet network. The database may further be configured to store the network performance information as related to respective subscribers of a communications carrier managing the communications network. In one embodiment, the database may include an indicia associated with each subscriber and the network performance information may be collected during communications by respective subscribers over the packet network.

System and method for managing subscriber usage of a communications network

The present invention relates to a method and network for controlling congestion in a packet-switched network, comprising traffic sources, traffic destinations and network nodes, wherein a packet queue length in a network node is determined and a congestion notification is transmitted back towards the source address of an incoming data packet received at the network node, if the detected packet queue length exceeds a predetermined threshold. Then, congestion control is performed at a predetermined intermediate network node in response to the receipt of the congestion notification. Thereby, burts of source traffic can be constrained and unnecessary packet losses can be avoided already at an intermediate access node and within the network. The congestion notification message generated due to an incipient congestion is immediately routed back according to its source address. As a result, control delay time is shortened, such that buffer size requirements and number of congestion notification messages are reduced.

Congestion control method for a packet-switched network

A new Fast Recovery Plus (FR+) mechanism, and associated method, for wireless and/or mobile network applications to avoid network congestion in a TCP/IP packet-switched network. A method of flow control and congestion avoidance congestion in a network determining, at the source node, if packet loss is due to transmission error; and if the packet loss is due to the transmission error, setting, at the source node, the slow start threshold Ssthresh to Max (CWND, (Ssthresh + CWND)/2), wherein CWND and Ssthresh exhibit values recorded, when the packet lost was detected.

Performance enhancement of transmission control protocol (tcp) for wireless network applications

A new and improved Explicit Congestion Notification (ECN) mechanism, and associated method, for wireless and/or mobile network applications to avoid network congestion in a TCP/IP packet-switched network. A method of avoiding congestion in such a network comprises the steps of: transmitting, at a source node, data packets to a destination node, via at least an intermediate mode; determining, at the intermediate node, if an incipient congestion is encountered, and if the incipient congestion is encountered, setting a Congestion Experienced (CE) flag in each data packet which indicates the incipient congestion to notify the congestion to the destination node; receiving, at the destination node, a CE data packet, setting an Explicit Congestion Notification-Echo (ECN-Echo) flag in an acknowledgement (ACK) packet subsequent to the CE data packet received, and sending an ECH-Echo ACK packet back to the source node to inform that the congestion was encountered in the network on the path from the source node to the destination node; upon receipt of the ECN-Echo ACK packet, reducing, at the source node, a congestion window and a transmission rate to avoid the congestion, and determining if a packet loss is due to congestion or due to a transmission error, when the incipient congestion is still encountered in the network; if the packet loss is due to congestion, retransmitting, at the source node, only a lost packet to the destination node, via the intermediate node; and if the packet loss is due to the transmission error, re-transmitting, at the source node, the lost packet to the destination node, via the intermediate node, while increasing a round-trip timeout (RTO) but maintaining the same congestion window in order to improve the throughput of connection.

Enhancement of explicit congestion notification (ecn) for wireless network applications

A method and system for transmitting information between a sending means and a receiving means using packets for information transmission. The receipt of transmitted packets is acknowledged and unacknowledged packets are retransmitted from the sending means. The amount of transmitted unacknowledged information or the number of consecutive unacknowledged packets is detected, and the reason for information or packet loss is determined based on the amount of transmitted unacknowledged information or the number of consecutive unacknowledged packets. This amount is compared with a path maximum transmission unit (PMTU) to determine the reason for loss. A single or small number of unacknowledged packets is determined to be a result of Bit Error Rate (BER), whereas a larger number of consecutive unacknowledged packets may be determined to be congestion. Congestion control parameters are kept unchanged when the reason for loss is caused by Bit Error Rate (BER), whereas control parameters are changed when the reason for loss is congestion.

System and method for a communication network

PR-SCTP (partial reliability stream control transport protocol) is the new unreliable extension to SCTP. This paper first introduces SCTP and PR-SCTP. Then it describes the mechanism of transmitting MPEG-4 over PRSCTP. Next we compare the performance of PR-SCTP, TCP and UDP for MPEG-4 video traffic over mobile networks.

Jian Ma

Papers

Congestion control method for a packet-switched network

Performance enhancement of transmission control protocol (tcp) for wireless network applications

Enhancement of explicit congestion notification (ecn) for wireless network applications

System and method for a communication network

The performance comparison of PRSCTP, TCP and UDP for MPEG-4 multimedia traffic in mobile network