System, device and method for improving throughput in a communication network, preferably a mobile ipv6-based network
First Claim
1. Method for managing a communication between a first network element and a second network element, wherein the communication is performed via a network on a packet basis, acknowledgment messages acknowledging receipt of packets are returned to the network element having sent these packets, and a congestion control is performed which variably defines an allowable number of packets which can be sent before receipt of acknowledgment messages for these packets, wherein said allowable number of packets is reduced in case of packet loss during transmission, wherein, when the first network element performs a hand-over and sends a message informing the network or a network element on the hand-over, the network or network element changes the congestion control to provide faster recovery rate of said allowable number after handover as compared to the recovery rate of said allowable number after packet loss.
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Abstract
The invention relates to a method and system for managing a communication between a first mobile network element and a second network element, wherein the communication is performed via a network on a packet-switched basis with acknowledgment messages acknowledging receipt of packets being returned to the packet sending network element. A congestion control is provided for controlling the number of packets being allowed to be sent before receipt of acknowledgment messages for these packets. The congestion control is adapted to change, when the first network element performs a hand-over and sends a message informing on the I hand-over, so as to provide faster recovery rate after handover as compared to the normal recovery rate after packet loss. At least one of the first and second network element is adapted, when receiving the message, to trigger the invocation of a fast retransmit and fast recovery algorithm. As an alternative, in order to provide the faster recovery rate after handover, a congestion window size may be step-wise increased after handover, or a threshold value defining a change from exponential to linear increase of the congestion window size, may be set to a value which is more than one half of the window size value before handover.
73 Citations
43 Claims
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1. Method for managing a communication between a first network element and a second network element, wherein
the communication is performed via a network on a packet basis, acknowledgment messages acknowledging receipt of packets are returned to the network element having sent these packets, and a congestion control is performed which variably defines an allowable number of packets which can be sent before receipt of acknowledgment messages for these packets, wherein said allowable number of packets is reduced in case of packet loss during transmission, wherein, when the first network element performs a hand-over and sends a message informing the network or a network element on the hand-over, the network or network element changes the congestion control to provide faster recovery rate of said allowable number after handover as compared to the recovery rate of said allowable number after packet loss.
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18. System for managing a communication between a first network element and a second network element, wherein
the communication is performed via a network on a packet basis, and acknowledgment messages acknowledging receipt of packets are returned to the network element having sent these packets, comprising congestion control means for performing a congestion control which variably defines an allowable number of packets which can be sent before receipt of acknowledgment messages for these packets, wherein said allowable number of packets is reduced in case of packet loss during transmission, wherein, when the first network element performs a hand-over and sends a message informing the network or a network element on the hand-over, the congestion control means changes the congestion control to provide faster recovery rate of said allowable number after handover as compared to the recovery rate of said allowable number after packet loss.
Specification