Self-configuring physical carrier sensing threshold adaptation
First Claim
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1. A method comprising:
- measuring a communication channel characteristic of a wireless communication channel for a local wireless network node of a network of nodes;
determining a local transmission threshold for the local wireless network node based on the measured communication channel characteristic, wherein the local transmission threshold includes a physical carrier sense threshold indicating a threshold level of interference that is tolerable for a physical layer of the local wireless network node, where interference sensed in the network by the local wireless network node exceeding the local transmission threshold causes the local wireless network node to back off from transmission;
receiving a transmission threshold from a remote network node, the received transmission threshold indicating a threshold level of interference that is tolerable for a physical layer of the remote network node, where interference sensed in the network by the remote network node exceeding the received transmission threshold causes the remote network node to back off from transmission; and
adjusting automatically the hardware settings of the physical layer of the local wireless network node based on the local transmission threshold and the received transmission threshold, including selecting the lower transmission threshold of the local transmission threshold and the received transmission threshold, and adjusting the hardware settings to make the wireless network node responsive to the selected transmission threshold, where interference exceeding the selected transmission threshold causes the local wireless network node to back off from transmission on the wireless communication channel.
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Abstract
Apparatuses and methods for dynamically adjusting carrier sensing threshold levels in a wireless, such as CSMA, system. A station may use the carrier sensing measurement made in normal CSMA operation to determine a threshold level for the local station, and transmit the determined level to other stations in the system. The station also receives similar information from other stations in the system and determines, based at least in part on the information received and the local determined threshold level, an optimal carrier sensing threshold level.
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Citations
23 Claims
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1. A method comprising:
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measuring a communication channel characteristic of a wireless communication channel for a local wireless network node of a network of nodes; determining a local transmission threshold for the local wireless network node based on the measured communication channel characteristic, wherein the local transmission threshold includes a physical carrier sense threshold indicating a threshold level of interference that is tolerable for a physical layer of the local wireless network node, where interference sensed in the network by the local wireless network node exceeding the local transmission threshold causes the local wireless network node to back off from transmission; receiving a transmission threshold from a remote network node, the received transmission threshold indicating a threshold level of interference that is tolerable for a physical layer of the remote network node, where interference sensed in the network by the remote network node exceeding the received transmission threshold causes the remote network node to back off from transmission; and adjusting automatically the hardware settings of the physical layer of the local wireless network node based on the local transmission threshold and the received transmission threshold, including selecting the lower transmission threshold of the local transmission threshold and the received transmission threshold, and adjusting the hardware settings to make the wireless network node responsive to the selected transmission threshold, where interference exceeding the selected transmission threshold causes the local wireless network node to back off from transmission on the wireless communication channel. - View Dependent Claims (2, 3, 4, 5)
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6. A network element of a wireless network comprising:
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a receiver to receive a carrier sensing signal sent from the network element to determine a physical carrier sense (PCS) characteristic of the network element, and to receive from a neighboring network element a signal indicating a PCS characteristic of the neighboring network element, where the received PCS characteristic of the neighboring network element indicates a threshold level of interference that is tolerable for a physical layer of the neighboring network element, where interference in the wireless network exceeding the received PCS characteristic of the neighboring network element causes the neighboring network element to back off from transmission; a transmitter to transmit a PCS characteristic determined for the network element; a processor coupled with the receiver and the transmitter, to process the received carrier sensing signal and determine a PCS characteristic for the network element based at least in part on the signal to noise ratio of the received carrier sensing signal, where the determined PCS characteristic of the network element indicates a threshold level of interference that is tolerable for a physical layer of the network element, where interference in the wireless network exceeding the determined PCS characteristic of the network element causes the network element to back off from transmission, and the processor to further determine an updated PCS characteristic for the network element based at least in part on the determined PCS characteristic for the network element and the received PCS characteristic of the neighboring network element, including determining which of the determined PCS characteristic for the network element or the received PCS characteristic for the neighboring network element is lower in value and selecting the lower value of the PCS characteristics as a value of the updated PCS characteristic; and hardware control circuits to set the hardware PCS threshold of the network element to the value of the updated PCS characteristic, where interference in the wireless network exceeding the updated PCS characteristic causes the network element to back off from transmission. - View Dependent Claims (7, 8, 9)
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10. A wireless electronic device comprising:
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a wireless device hardware circuit having; a processor to determine a hardware carrier sensing sensitivity level based at least in part on a carrier sensing level determined for the wireless electronic device based on an interference condition of a communication channel and a carrier sensing level received from a remote wireless electronic device in a network that produces interference on the communication channel, wherein the carrier sensing level determined for the wireless electronic device indicates a threshold level of interference that is tolerable for a physical layer of the wireless electronic device, where interference on the communication channel exceeding the threshold level indicated by the carrier sensing level determined for the wireless electronic device causes the wireless electronic device to back off from transmission on the communication channel, and wherein the received carrier sensing level for the remote wireless electronic device indicates a threshold level of interference that is tolerable for a physical layer of the remote wireless electronic device, where interference in the network exceeding the threshold level indicated by the received carrier sensing level for the remote wireless electronic device causes the remote wireless electronic device to back off from transmission; and a control circuit to adjust the hardware carrier sensing sensitivity level to the determined level, where interference in the wireless network exceeding the updated PCS characteristic causes the network element to back off from transmission; and a flash memory coupled with the chipset to store data from the processor and provide stored data to the processor. - View Dependent Claims (11, 12, 13)
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14. An article of manufacture comprising a machine-accessible storage medium having content stored thereon to provide instructions to cause an electronic system to:
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measure a communication channel characteristic of a wireless communication channel for a local wireless network node of a network of nodes; determine a local transmission threshold for the local wireless network node based on the measured communication channel characteristic, wherein the local transmission threshold includes a physical carrier sense threshold indicating a threshold level of interference that is tolerable for a physical layer of the local wireless network node, where interference sensed in the network by the local wireless network node exceeding the local transmission threshold causes the local wireless network node to back off from transmission; receive a transmission threshold from a remote network node, the received transmission threshold indicating a threshold level of interference that is tolerable for a physical layer of the remote network node, where interference sensed in the network by the remote network node exceeding the received transmission threshold causes the remote network node to back off from transmission; and adjust automatically the hardware settings of the physical layer of the local wireless network node based on the local transmission threshold and the received transmission threshold, including selecting the lower transmission threshold of the local transmission threshold and the received transmission threshold, and adjusting the hardware settings to make the wireless network node responsive to the selected transmission threshold, where interference exceeding the selected transmission threshold causes the local wireless network node to back off from transmission on the wireless communication channel. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a processor to determine a carrier sensing threshold for the apparatus based at least in part on interference associated with a communication channel of a transmission medium, including determining a physical carrier sense threshold for the apparatus indicating a threshold level of interference that is tolerable for a physical layer of the apparatus, where interference on the communication channel exceeding the threshold level causes the apparatus to back off from transmission on the communication channel, and based at least in part on a remote carrier sensing threshold of a remote wireless network device sent to the apparatus from the remote wireless network device, the remote carrier sensing threshold indicating a threshold level of interference that is tolerable for a physical layer of the remote wireless electronic device, where interference in the network exceeding the threshold level indicated by the remote carrier sensing level for the remote wireless electronic device causes the remote wireless electronic device to back off from transmission, wherein the determined carrier sensing threshold for the apparatus is selected as the lower of the physical carrier sense threshold for the apparatus and the remote carrier sense threshold for the remote wireless network device; and a control circuit to adjust the carrier sensing threshold to the determined carrier sensing threshold to cause the apparatus to be responsive to the determined carrier sensing threshold, where interference exceeding the determined carrier sensing threshold causes the apparatus to back off from transmission on the communication channel. - View Dependent Claims (21, 22, 23)
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Specification