Wireless communications method and apparatus for spatial sharing using carrier sense multiple access medium access

Patent metadata

Field	Value
Publication number	US-12074668-B2
Application number	US-202017087095-A
Country	US
Kind code	B2
Filing date	Nov 2, 2020
Priority date	Sep 11, 2014
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

A station (STA) may receive a wireless signal including a preamble of a packet. An energy level of the signal received may exceed a clear channel assessment (CCA) threshold. The STA may issue a primitive to stop reception of the packet. Further, the STA may return to a receive state based on the primitive. Additionally, the STA may determine, using a carrier sense multiple access (CSMA) protocol, to ignore a payload portion of the packet based on information contained in the preamble and adjust the CCA threshold to account for the payload portion of the packet. The STA may then access a wireless medium using the CSMA protocol during the payload portion of the packet using the adjusted CCA threshold. In a further example, the CCA threshold may be a received signal strength indicator (RSSI) level or a received channel power indicator (RCPI) level.

First claim

What is claimed:

1. A method for use in a station (STA), the method comprising:
receiving, by the STA, a wireless signal including a preamble of a packet, wherein a received energy level of the wireless signal exceeds a clear channel assessment (CCA) threshold, wherein the CCA threshold is a received channel power indicator (RCPI) level;
issuing, by the STA, a primitive to stop reception of the packet; and
returning, by the STA, to a receive state based on the primitive.

2. The method of claim 1 , further comprising:
determining, by the STA, using a carrier sense multiple access (CSMA) protocol, to ignore a payload portion of the packet based on information contained in the preamble of the packet.

3. The method of claim 2 , further comprising:
adjusting, by the STA, the CCA threshold to account for the payload portion of the packet; and
accessing, by the STA, a wireless medium using the CSMA protocol during the payload portion of the packet using the adjusted CCA threshold.

4. The method of claim 1 , wherein the preamble of the packet is received by the STA via a beamformed signal.

5. The method of claim 1 , wherein the preamble of the packet is received by the STA via an omni-directional signal.

6. The method of claim 2 , wherein the determination to ignore the payload portion of the packet is based on an RXVECTOR.

7. The method of claim 3 , wherein the adjusting includes accounting for a received energy level of the payload portion of the packet.

8. The method of claim 3 , wherein the adjusting includes setting the CCA threshold using the received energy level of the payload portion of the packet and a margin.

9. The method of claim 1 , wherein the primitive is a PHY_RXSTOP.request primitive.

10. A station (STA) comprising:
a processor; and
a transceiver operatively coupled to the processor; wherein:
the transceiver is configured to receive a wireless signal including a preamble of a packet, wherein a received energy level of the wireless signal exceeds a clear channel assessment (CCA) threshold wherein the CCA threshold is a received channel power indicator (RCPI) level;
the processor is further configured to issue a primitive to stop reception of the packet; and
the processor is further configured to return to a receive state based on the primitive.

11. The STA of claim 10 , wherein:
the processor is further configured to determine, using a carrier sense multiple access (CSMA) protocol, to ignore a payload portion of the packet based on information contained in the preamble of the packet.

12. The STA of claim 11 , wherein:
the processor is further configured to adjust the CCA threshold to account for the payload portion of the packet; and
the processor and transceiver are further configured to access a wireless medium using the CSMA protocol during the payload portion of the packet using the adjusted CCA threshold.

13. The STA of claim 10 , wherein the preamble of the packet is received by the processor and transceiver via a beamformed signal.

14. The STA of claim 10 , wherein the preamble of the packet is received by the processor and transceiver via an omni-directional signal.

15. The STA of claim 11 , wherein the determination to ignore the payload portion of the packet is based on an RXVECTOR.

16. The STA of claim 12 , wherein the adjusting includes accounting for a received energy level of the payload portion of the packet.

17. The STA of claim 12 , wherein the adjusting includes setting the CCA threshold using the received energy level of the payload portion of the packet and a margin.

18. The STA of claim 10 , wherein the primitive is a PHY_RXSTOP.request primitive.

Assignees

• Interdigital Patent Holdings Inc
• Interdigital Patent Holding Inc

Inventors

• Zhang Guodong
• Lou Hanqing
• Wang Xiaofei

Classifications

• H04W74/0816

  with collision avoidance · CPC title

• H04W52/46

  in multi-hop networks, e.g. wireless relay networks · CPC title

• H04J11/0023

  Interference mitigation or co-ordination (direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541) · CPC title

• H04W74/0808

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04B7/0617 Primary

  for beam forming · CPC title