US 10,568,134 B2Granted

Enhanced clear channel assessment

AssigneeCisco Technology, Inc.

InventorsBrian D. Hart, David Kloper, Pooya Monajemi, Matthew A. Silverman

Life of this patent

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Abstract

A third device stores a receive signal strength of a received response data unit transmitted by a second device after receiving a first data unit transmitted by a first device. The third device obtains a clear channel access parameter included in a header of a second data unit transmitted by the first device to the second device and detects transmission exchanges in each of a plurality of service sets to use as samples of overlapping service set activity. The third device determines a minimum transmit power to be used by the third device to send a transmission to the fourth device based on transmission exchanges between devices in a particular service set. The third device determines whether to send a transmission to the fourth device based on the clear channel access parameter and minimum transmit power.

Claims20

Dependent claims

In a wireless network environment that includes first and second devices that are part of a first service set and third and fourth devices that are part of a second service set, and the third and fourth devices being in sufficient proximity to the first and second devices to receive transmissions sent between the first and second devices, a method comprising:

storing at the third device a receive signal strength of a received response data unit transmitted by the second device in response to reception by the second device of a first data unit transmitted by the first device;
obtaining a clear channel access parameter included in a header of a second data unit transmitted by the first device to the second device;
detecting transmission exchanges in each of a plurality of service sets for use as samples of overlapping service set activity in the wireless network environment;
determining a minimum transmit power to be used by the third device, with respect to a particular subset of the plurality of service sets, based on the transmission exchanges between devices in the particular subset of the plurality of service sets;
and
determining whether to send a transmission from the third device to the fourth device based on a comparison of the clear channel access parameter with a sum of the minimum transmit power to be used by the third device for transmission to the fourth device and the receive signal strength of the received response data unit.

3 more elements

An apparatus comprising:

a communication interface configured to enable network communications;
a processing device coupled with the communication interface, and configured to:
store a receive signal strength of a received response data unit transmitted by a first device in response to reception by the first device of a first data unit transmitted by a second device;
obtain a clear channel access parameter included in a header of a second data unit transmitted by the second device to the first device;
detect transmission exchanges in each of a plurality of service sets for use as samples of overlapping service set activity in a wireless network environment;
determine a minimum transmit power to be used, with respect to a particular subset of the plurality of service sets, based on the transmission exchanges between devices in the particular subset of the plurality of service sets;
and
determine whether to send a transmission to a third device based on a comparison of the clear channel access parameter with a sum of the minimum transmit power to be used for transmission to the third device and the receive signal strength of the received response data unit.

5 more elements

One or more non-transitory computer readable storage media encoded with instructions that, when executed by a processor, cause the processor to:

store a receive signal strength of a received response data unit transmitted by a first device in response to reception by the first device of a first data unit transmitted by a second device;
obtain a clear channel access parameter included in a header of a second data unit transmitted by the second device to the first device;
detect transmission exchanges in each of a plurality of service sets for use as samples of overlapping service set activity in a wireless network environment;
determine a minimum transmit power to be used, with respect to a particular subset of the plurality of service sets, based on the transmission exchanges between devices in the particular subset of the plurality of service sets;
and
determine whether to send a transmission to a third device based on a comparison of the clear channel access parameter with a sum of the minimum transmit power to be used for transmission to the third device and the receive signal strength of the received response data unit.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/037,480Filed 17 Jul 2018 · continuation
Priority: 6 Nov 2015
Published: US 2018/0343674 A129 Nov 2018
Granted: 18 Feb 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04W 74/08
Wireless channel access: non-scheduled access, e.g. ALOHA
H04L 1/00
Arrangements for detecting or preventing errors in the information received
H04L 5/0055
Allocation of signalling, i.e. of overhead other than pilot signals: physical resource allocation for ACK/NACK
H04W 52/228
Taking into account previous information or commands: using past power values or information

Family

Application62/251,858Us provisional application · filed 6 Nov 2015
Application15/150,708Parent of this continuation · filed 10 May 2016
US 2018/0343674 A1Pre-grant publication · published 29 Nov 2018
US 10,075,976 B2Parent of this continuation
US 2017/0135131 A1Published application
US 10,568,134 B2This patent

From the US filing history. Foreign family members aren’t listed.