Apparatus and methods for TXOP duration field in PHY header
AssigneeNewracom, Inc.
InventorsYujin Noh, Yongho Seok
Life of this patent
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Abstract
A method is implemented by a station (STA) in a Wireless Local Area Network (WLAN) to update a Network Allocation Vector (NAV) maintained by the STA. The method includes receiving a first Physical Layer Protocol Data Unit (PPDU), determining whether a duration indicated in a control field of a preamble portion of the first PPDU is greater than a current NAV value, determining whether the first PPDU is received as an immediate response to a second PPDU previously transmitted by the STA, and updating the NAV maintained by the STA using the duration in response to a determination that the duration is greater than the current NAV value and the first PPDU is not received as an immediate response to the second PPDU previously transmitted by the STA.
Claims14
A method implemented by a station (STA) in a Wireless Local Area Network (WLAN) to update a Network Allocation Vector (NAV) maintained by the STA, the method comprising:
- receiving a first Physical Layer Protocol Data Unit (PPDU), wherein the STA is able to decode a preamble portion of the first PPDU but unable to decode a payload portion of the first PPDU;
- determining whether a duration indicated in a control field of the preamble portion of the first PPDU is greater than a current NAV value;
- determining whether the first PPDU is received as an immediate response to a second PPDU previously transmitted by the STA;
- updating the NAV maintained by the STA using the duration indicated in the control field of the preamble portion of the first PPDU in response to a determination that the duration indicated in the control field of the preamble portion of the first PPDU is greater than the current NAV value and the first PPDU is not received as an immediate response to the second PPDU previously transmitted by the STA, wherein the STA is configured to refrain from updating the NAV maintained by the STA in response to a determination that the first PPDU is received as an immediate response to the second PPDU previously transmitted by the STA;
- and
- attempting to access the wireless medium after the NAV has expired, wherein the STA is configured to refrain from attempting to access the wireless medium before the NAV has expired.
A network device to function as a station (STA) in a Wireless Local Area Network (WLAN) to update a Network Allocation Vector (NAV) maintained by the STA, the network device comprising:
- a Radio Frequency (RF) transceiver;
- a set of one or more processors;
- and
- a non-transitory machine-readable medium having stored therein a NAV component, which when executed by the set of one or more processors, causes the network device to receive a first Physical Layer Protocol Data Unit (PPDU), wherein the STA is able to decode a preamble portion of the first PPDU but unable to decode a payload portion of the first PPDU, determine whether a duration indicated in a control field of the preamble portion of the first PPDU is greater than a current NAV value, determine whether the first PPDU is received as an immediate response to a second PPDU previously transmitted by the STA, update the NAV maintained by the STA using the duration indicated in the control field of the preamble portion of the first PPDU in response to a determination that the duration indicated in the control field of the preamble portion of the first PPDU is greater than the current NAV value and the first PPDU is not received as an immediate response to the second PPDU previously transmitted by the STA, wherein the STA is to refrain from updating the NAV maintained by the STA in response to a determination that the first PPDU is received as an immediate response to the second PPDU previously transmitted by the STA, and attempt to access the wireless medium after the NAV expires, wherein the STA is to refrain from attempting to access the wireless medium before the NAV has expired.
Dependencies are inferred from the claim text.