Adaptive link quality management for wireless medium
First Claim
1. A network node for metro area networking comprising:
- a first wireless interface configured for coupling to a second network node;
a link quality management unit coupled to the first wireless interface and having a transmission power control unit;
a first transmission parameter control unit;
wherein the transmission power control unit is configured to control a transmission power level of the first wireless interface; and
wherein the transmission power control unit comprises a received power level detector coupled to measure a received power level of an incoming signal received by the first wireless interface.
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Accused Products
Abstract
To provide the quality and reliability of a fiber optic link over a wireless link, network nodes in accordance with the present invention include a link quality management unit, which controls multiple transmission parameters of a wireless interface in response variable link conditions. For example, the link quality management unit of one embodiment of the present invention controls transmission power, modulation, and error correction. In general, a receiving network node provides feedback to a transmitting network node. Thus, in many embodiments of the present invention, the link quality management unit includes a signal quality detector, which measures a signal quality value, such as bit error rate, signal to noise ratio, or error vector magnitude. The measured signal quality is transmitted back to the transmitting node so that appropriate changes can be made to the transmission parameters.
88 Citations
25 Claims
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1. A network node for metro area networking comprising:
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a first wireless interface configured for coupling to a second network node; a link quality management unit coupled to the first wireless interface and having a transmission power control unit; a first transmission parameter control unit; wherein the transmission power control unit is configured to control a transmission power level of the first wireless interface; and wherein the transmission power control unit comprises a received power level detector coupled to measure a received power level of an incoming signal received by the first wireless interface. - View Dependent Claims (2, 3, 4, 5)
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6. A network node for metro area networking comprising:
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a first wireless interface configured for coupling to a second network node; a link quality management unit coupled to the first wireless interface and having a transmission power control unit; a first transmission parameter control unit; wherein first transmission parameter control unit is a modulation control unit configured to control the modulation rate of the first wireless interface; and wherein the modulation control unit uses quadrature amplitude modulation. - View Dependent Claims (7)
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8. A network node for metro area networking comprising:
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a first wireless interface configured for coupling to a second network node; a link quality management unit coupled to the first wireless interface and having a transmission power control unit; a first transmission parameter control unit; wherein the first transmission parameter control unit comprises; (a) an error correction unit configured to generate error correction code for the first wireless interface; and (b) an ECC level control unit coupled to control a level of redundancy in the error correction unit; and wherein the error correction unit comprises; (a) a first ECC encoder; and (b) a second ECC encoder coupled to the first ECC encoder. - View Dependent Claims (9, 10, 11)
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12. A network node for metro area networking using time division multiplexing, the network node comprising:
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a first wireless interface configured for coupling to a second network node; a link quality management unit coupled to the first wireless interface, wherein the link quality management unit is configured to increase the bandwidth of the first wireless interface when a signal quality value is greater than a signal quality threshold, and to decrease the bandwidth of the first wireless interface when the signal link quality value is less than the signal quality threshold; wherein the link quality management unit comprises a modulation control unit configured to control the modulation rate of the first wireless interface; wherein the modulation control unit is coupled to receive the signal quality value from the second network node; and wherein the modulation control unit adjusts the modulation of the first wireless interface based on the signal quality ratio. - View Dependent Claims (13, 14)
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15. A network node for metro area networking using time division multiplexing, the network node comprising:
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a first wireless interface configured for coupling to a second network node; a link quality management unit coupled to the first wireless interface, wherein the link quality management unit is configured to increase the bandwidth of the first wireless interface when a signal quality value is greater than a signal quality threshold, and to decrease the bandwidth of the first wireless interface when the signal link quality value is less than the signal quality threshold; wherein the link quality management unit comprises; (a) an error correction unit configured to generate error correction code for the first wireless interface; and (b) an ECC level control unit coupled to control a level of redundancy in the error correction unit; and wherein the error correction unit comprises; (a) a first ECC encoder; and (b) a second ECC encoder coupled to the first ECC encoder. - View Dependent Claims (16, 17, 18)
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19. A method of controlling a wireless link between a transmitting network node and a receiving network node, the method comprising:
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measuring a first signal quality value at the receiving network node; measuring a second signal quality value at the receiving network node; providing the first signal quality value and the second signal quality value to the transmitting network node adapting a first transmission parameter to improve the signal quality value; and
adapting a transmission power level to improve the second signal quality value;wherein the second signal quality value is a received power level; and wherein the measuring a second signal quality value at the receiving network node, further comprises;
comparing the received power level with a threshold value; and
generating a received power error value as the first signal quality value. - View Dependent Claims (20, 21, 22)
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23. A system for controlling a wireless link between a transmitting network node and a receiving network node, the method comprising:
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means for measuring a first signal quality value at the receiving network node; means for measuring a second signal quality value at the receiving network node; means for providing the first signal quality value and the second signal quality value to the transmitting network node means for adapting a first transmission parameter to improve the signal quality value; means for adapting a transmission power level to improve the second signal quality value; wherein the second signal quality value is a received power level; and wherein the means for measuring a second signal quality value at the receiving network node, further comprises; (a) means for comparing the received power level with a threshold value; and (b) means for generating a received power error value as the first signal quality value.
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24. A system for controlling a wireless link between a transmitting network node and a receiving network node, the method comprising:
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means for measuring a first signal quality value at the receiving network node; means for measuring a second signal quality value at the receiving network node; means for providing the first signal quality value and the second signal quality value to the transmitting network node means for adapting a first transmission parameter to improve the signal quality value; means for adapting a transmission power level to improve the second signal quality value; wherein the first transmission parameter is a modulation level; and wherein the means for adapting a first transmission parameter to improve the signal quality value, further comprises means for decreasing the modulation level when the signal quality value is less than a desired signal quality value. - View Dependent Claims (25)
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Specification