Dynamic encoding rate control minimizes traffic congestion in a packet network
First Claim
1. A method for minimizing traffic overload at an edge node in a packet network that carries bursty traffic and includes intermediate nodes through which traffic is routed, the method comprising the steps of:
- coding bursty information at one edge node into a digital format for transmission as packets to another edge node, the coding including a first coding rate utilized except during a traffic overload and a second coding rate less than the first rate;
determining at said one edge node if a reverse congestion indicator (RCIB) in the header of a packet sent from said another node is set thereby indicating a traffic overload condition in the transmission path from said one edge node to said another node;
if said RCIB is set, utilizing said second coding rate at said one node to reduce the traffic input into the network.
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Abstract
This invention is suited for a packet network that carries bursty data. A mechanism is coupled to an edge node for coding bursty information into a digital format at either a first coding rate of a second coding rate which is less than the first rate. A mechanism senses traffic overload of one or more intermediate nodes carrying the bursty informaton. A mechanism which is responsive to the overload sensing mechanism causes the coding mechanism to switch from the first rate to the second rate while a traffic overload is sensed. Thus, network demand requirements are reduced and the overload will be alleviated.
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Citations
12 Claims
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1. A method for minimizing traffic overload at an edge node in a packet network that carries bursty traffic and includes intermediate nodes through which traffic is routed, the method comprising the steps of:
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coding bursty information at one edge node into a digital format for transmission as packets to another edge node, the coding including a first coding rate utilized except during a traffic overload and a second coding rate less than the first rate; determining at said one edge node if a reverse congestion indicator (RCIB) in the header of a packet sent from said another node is set thereby indicating a traffic overload condition in the transmission path from said one edge node to said another node; if said RCIB is set, utilizing said second coding rate at said one node to reduce the traffic input into the network. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A packet network that carries bursty traffic and includes edge nodes that input traffic into the network and intermediate nodes through which traffic is routed comprising:
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means for coding bursty information at one edge node into a digital format for transmission as packets to another edge node, the coding means including a first coding rate utilized except during a traffic overload and a second coding rate less than the first rate; means for determining if a reverse congestion indicator (RCIB) in the header of a packet sent from said another node to said one node is set thereby indicating a traffic overload condition in the transmission path from said one edge node to said another node; if said RCIB is set, said determining means utilizing said second coding rate at said one node to reduce the traffic input into the network. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification