METHOD AND APPARATUS FOR SUPPORTING WIDEBAND AND MULTIPLE BANDWIDTH TRANSMISSION PROTOCOLS

• US 20180084580A1
• Filed: 11/30/2017
• Published: 03/22/2018
• 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: ANEPU, Bhaskar M., Grandhi, Sudheer A., Wang, Xiaofei
• Granted Patent: US 10,334,626 B2
• Time in Patent Office: Days
• 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, an access point (AP) may receive, from a wireless transmit receive unit (WTRU), a first CF-End frame that includes a duration field and a basic service set identifier (BSSID) field that includes an individual/group bit. On a condition that the individual/group bit of the BSSID field has a value of one (1), the AP may determine that a scrambling sequence of the first CF-End frame indicates a bandwidth associated with a transmit opportunity (TXOP) being truncated by the WTRU. The AP may then transmit a second CF-End frame at the bandwidth indicated by the scrambling sequence of the first CF-End frame.

Claims

1. A method for use in an access point (AP), the method comprising:

receiving, from a wireless transmit receive unit (WTRU), a first CF-End frame that includes a duration field and a basic service set identifier (BSSID) field that includes an individual/group bit;

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 first CF-End frame indicates a bandwidth associated with a transmit opportunity (TXOP) being truncated by the WTRU; and

transmitting a second CF-End frame at the bandwidth indicated by the scrambling sequence of the first CF-End frame.

2. The method of claim 1, wherein the TXOP being truncated by the 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 the 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. The method of claim 1, wherein the first CF-End frame is received from a WTRU located in a neighbor basic service service set (BSS) on a primary channel of the AP.

9. The method of claim 1, wherein the first CF-End frame is received from a WTRU located in a BSS associated with the AP on a primary channel of the AP.

10. An access point (AP) comprising:

a receiver configured to receive, from a wireless transmit receive unit (WTRU), a first CF-End frame that includes a duration field and a basic service set identifier (BSSID) field that includes an individual/group bit;

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

a transmitter configured to transmit a second CF-End frame at the bandwidth indicated by the scrambling sequence of the first CF-End frame.

11. The AP of claim 10, wherein the TXOP being truncated by the WTRU is a wideband TXOP.

12. The AP of claim 11, wherein the wideband TXOP is an 80 MHz transmission.

13. The AP of claim 11, wherein the wideband TXOP is a 160 MHz transmission.

14. The AP of claim 13, wherein the 160 MHz transmission is an 80 MHz+80 MHz transmission.

15. The AP of claim 10, wherein the transmitter is further configured to transmit the second CF-End frame after an inter-frame space duration.

16. The AP of claim 15, wherein the inter-frame space duration is a short inter-frame space (SIFS) duration.

17. The AP of claim 10, wherein the first CF-End frame is received from a WTRU located in a neighbor basic service service set (BSS) on a primary channel of the AP.

18. The AP of claim 10, wherein the first CF-End frame is received from a WTRU located in a BSS associated with the AP on a primary channel of the AP.