METHOD AND APPARATUS FOR SUPPORTING WIDEBAND AND MULTIPLE BANDWIDTH TRANSMISSION PROTOCOLS

• US 20160295610A1
• Filed: 06/13/2016
• Published: 10/06/2016
• Est. Priority Date: 06/24/2011
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Grandhi, Sudheer A., Anepu, Bhaskar M., Wang, Xiaofei
• Granted Patent: US 9,844,075 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 74/06 using polling
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 88/08 Access point devices

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.

Claims

1. A method for use in a first wireless transmit/receive unit (WTRU), the method comprising:

generating a contention free (CF)-End frame that 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;

on a condition that a transmit opportunity (TXOP) is being truncated, setting the individual/group bit of the BSSID field to a value of one (1), and setting a scrambling sequence associated with the CF-End frame to indicate a bandwidth associated with the TXOP being truncated by the first WTRU; and

transmitting the CF-End frame to enable a second WTRU receiving the CF-End frame to set a network allocation vector (NAV) associated with the indicated bandwidth.

2. The method of claim 1, wherein the TXOP being truncated by the first WTRU is a wideband TXOP.

3. The method of claim 2, wherein the wideband TXOP is an 80 MHz transmission.

4. The method of claim 2, wherein the wideband TXOP is a 160 MHz transmission.

5. The method of claim 4, wherein the 160 MHz transmission is an 80 MHz+80 MHz transmission.

6. The method of claim 1 further comprising:

transmitting a second CF-End frame after an inter-frame space duration.

7. The method of claim 6, wherein the inter-frame space duration is a short inter-frame space (SIFS) duration.

8. A first wireless transmit/receive unit (WTRU) comprising:

a processor configured to generate a contention free (CF)-End frame that 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 a transmit opportunity (TXOP) is being truncated, setting the individual/group bit of the BSSID field to a value of one (1), and setting a scrambling sequence associated with the CF-End frame to indicate a bandwidth associated with the TXOP being truncated by the first WTRU; and

a transmitter configured to transmit the CF-End frame to enable a second WTRU receiving the CF-End frame to set a network allocation vector (NAV) associated with the indicated bandwidth.

9. The first WTRU of claim 8, wherein the TXOP being truncated by the first WTRU is a wideband TXOP.

10. The first WTRU of claim 9, wherein the wideband TXOP is an 80 MHz transmission.

11. The first WTRU of claim 9, wherein the wideband TXOP is a 160 MHz transmission.

12. The first WTRU of claim 11, wherein the 160 MHz transmission is an 80 MHz+80 MHz transmission.

13. The first WTRU of claim 8, wherein the transmitter is further configured to transmit a second CF-End frame after an inter-frame space duration.

14. The first WTRU of claim 13, wherein the inter-frame space duration is a short inter-frame space (SIFS) duration.