Method and apparatus for supporting wideband and multiple bandwidth transmission protocols
First Claim
1. A method for use in a first wireless transmit/receive unit (WTRU), the method comprising:
- maintaining a network allocation vector (NAV);
receiving a contention free (CF)-End frame from a second WTRU, wherein the CF-End frame includes a duration field and a basic service set identifier (BSSID) field indicating a medium access control (MAC) address associated with an access point (AP), wherein the BSSID field includes an individual/group bit; and
on a condition that the individual/group bit of the BSSID field has a value of one (1), determining that a scrambling sequence of the CF-End frame indicates a bandwidth associated with a transmit opportunity (TXOP) being truncated by the second WTRU and resetting the NAV.
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Accused Products
Abstract
Enhanced protocols and devices may be used to alleviate loss of spectrum efficiency in wideband transmission. The protocols may implement a wideband transmission opportunity (TXOP) truncation where one or more of the channels involved in communication over the wideband are released. In one scenario, a wireless transmit/receive unit (WTRU) may obtain a TXOP for a 2 MHz bandwidth mode frame transmission with another device capable of operating in a 2 MHz bandwidth mode and a 1 MHz bandwidth mode. The WTRU may conduct a request-to-send (RTS)/clear-to-send (CTS) frame exchange in the second bandwidth mode, and truncate the TXOP by transmitting a contention free (CF)-End frame in the first and second bandwidth modes. In another scenario, an AP may obtain a TXOP for a 2 MHz bandwidth mode frame transmission with a WTRU capable of both 2 MHz and 1 MHz bandwidth modes.
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Citations
12 Claims
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1. A method for use in a first wireless transmit/receive unit (WTRU), the method comprising:
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maintaining a network allocation vector (NAV); receiving a contention free (CF)-End frame from a second WTRU, wherein the CF-End frame includes a duration field and a basic service set identifier (BSSID) field indicating a medium access control (MAC) address associated with an access point (AP), wherein the BSSID field includes an individual/group bit; and on a condition that the individual/group bit of the BSSID field has a value of one (1), determining that a scrambling sequence of the CF-End frame indicates a bandwidth associated with a transmit opportunity (TXOP) being truncated by the second WTRU and resetting the NAV. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A first wireless transmit/receive unit (WTRU) comprising:
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a processor configured to maintain a network allocation vector (NAV); a receiver configured to receive a contention free (CF)-End frame from a second WTRU, wherein the CF-End frame includes a duration field and a basic service set identifier (BSSID) field that indicates a medium access control (MAC) address associated with an access point (AP), wherein the BSSID field includes an individual/group bit; wherein on a condition that the individual/group bit of the BSSID field has a value of one (1), the processor is further configured to determine that a scrambling sequence of the CF-End frame indicates a bandwidth associated with a transmit opportunity (TXOP) being truncated by the second WTRU and reset the NAV. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification