System and method for bandwidth reservation for multimedia traffic in communication networks
First Claim
1. A method for use in a digital communications multi-station ring network employing at least one ring token and having at least one server transmitting server frames at a predetermined priority and a plurality of client stations, comprisinggenerating unrequested bandwidth reservation acknowledgement frames by one of said client stations;
- transmitting, by said one of said client stations, said acknowledgement frames onto said ring at a non-zero priority less than said predetermined to and received by no said client stations on said ring; and
inhibiting said server from transmitting a request for or confirmation of said acknowledgement frames.
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Accused Products
Abstract
A system and method is provided to compliment use of priority for reserved traffic in multimedia computerized data communication networks, to insure that the opportunity for transmitting large, unreserved data frames is constrained. If frames transmitted when the server releases a token tend to be small, then the server will capture a larger portion of the bandwidth. Thus, a short bandwidth reservation acknowledgement is transmitted onto the ring by the client for selected frames which it receives. This is not addressed to any station on the ring. Rather it is simply transmitted at a non-zero priority less than the server'"'"'s priority. The criteria which is employed by the client for such acknowledgement is that the sender will send a bandwidth reservation acknowledgement only when the IEEE 802.5 AC field is set, but will do so for a fixed amount of time or for a fixed number of received frames. This criteria provides an optimization reducing overall ring utilization, since the bandwidth reservation acknowledgement is only sent when the ring is congested. A communication network is disclosed which transmits an unsolicited acknowledgement at non-zero priority for each non-zero priority frame received, such system thereby being independent of the communication protocol employed by the network station.
82 Citations
20 Claims
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1. A method for use in a digital communications multi-station ring network employing at least one ring token and having at least one server transmitting server frames at a predetermined priority and a plurality of client stations, comprising
generating unrequested bandwidth reservation acknowledgement frames by one of said client stations; -
transmitting, by said one of said client stations, said acknowledgement frames onto said ring at a non-zero priority less than said predetermined to and received by no said client stations on said ring; and inhibiting said server from transmitting a request for or confirmation of said acknowledgement frames. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for use in a digital communications multi-station ring network employing at least one ring token and having at least one server transmitting server frames at a predetermined priority and a plurality of client stations, comprising
means for generating unrequested bandwidth reservation acknowledgement frames by one of said client stations; - and
means for transmitting, by said one of said client stations, said acknowledgement frames onto said ring at a non-zero priority less than said predetermined priority, said acknowledgement frames being addressed to no said client stations on said ring; and means for inhibiting said server from transmitting a request for or confirmation of said acknowledgement frames. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification