Nokia Corporation

Nokia Internet Communications, Inc.

Shiduan Cheng

Jian Ma

Haitao Wu

Jing Li

Jing Wu

Keping Long

Qian Wang

Liang Sun

Runtong Zhang

The present invention relates to a method and network element for scheduling data transmission in a packet data network, e.g. a differentiated services network. Data traffic of a predetermined traffic class is classified based on a predetermined traffic profile, e.g. responsive or non-responsive traffic, and an in-profile rate of the data traffic is estimated. Then, a weight determining a transmit order of queued data packets of said predetermined traffic class is adjusted according to the estimated in-profile rate. Thus, the data traffic is marked into different classes based on the traffic profile and a queue scheduler improves fairness between the classified flows in the packet data network. Thereby, enhanced fairness between traffic profiles can be achieved easily and effectively.

Self-adaptive scheduling method and network element

Systems and methods are disclosed for marking a packet with a precedence value in a TCP-friendly way. One system and method marks packets with a precedence value based on a probability function. Another system and method marks packets with one of three precedence values based on network traffic but enables interleaving of differently marked packets when a certain number of packets have been successively marked with a low or medium precedence value.

TCP-friendly markers and methods using token buckets

A method for enhancing the fairness and performance in a multihop ad hoc network, the method usually including providing contention synchronization information regarding a transmission between nodes of the network, wherein the information is routinely provided to nodes in a range of two hops from the nodes participating at the transmission. The method also typically includes setting, after successfully finishing the transmission, a waiting time for the nodes participating at the transmission, in which these nodes backoff from accessing a transmission medium.

Method for enhancing fairness and performance in a multihop ad hoc network and corresponding system

A new Fast Recovery Plus (FR&plus;) mechanism, and associated method, for wireless and/or mobile network applications to control data flow and avoid network congestion in a TCP/IP packet-switched network.

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

An Explicit Congestion Notification (ECN) method is disclosed for wireless applications to avoid network congestion in a TCP/IP packet-switched network. Such method comprises transmitting, at a source node, data packets to a destination node, via at least an intermediate node; determining, at the intermediate node, if an incipient congestion is encountered, setting a Congestion Experienced (CE) flag in each data packet to notify congestion; sending, at the destination node, an ECN-Echo acknowledgment packet back to the source node to inform congestion; reducing, at the source node, a congestion window and a transmission rate to avoid congestion; if the packet loss is due to congestion, re-transmitting, at the source node, only a lost packet to the destination node; alternatively, if the packet loss is due to transmission error, re-transmitting, the lost packet to the destination node, while increasing a round-trip timeout but maintaining the same congestion window.

Growing community of inventors

Beijing, China

Shiduan Cheng