Method for accessing channel under spatial multiplexing and station

• US 9,832,793 B2
• Filed: 04/24/2014
• Issued: 11/28/2017
• Est. Priority Date: 07/12/2013
• Status: Active Grant

• Current Assignee: Xi'An Zhongxing New Software Co., Ltd. (ZTE Corporation)
• Original Assignee: Xi'An Zhongxing New Software Co., Ltd. (ZTE Corporation)
• Inventors: Xing, Weimin, Li, Nan, Tian, Kaibo, Lv, Kaiying
• Primary Examiner(s): Roberts, Brian
• Application Number:
  US14/903,598
• Publication Number:
  US 20160174262A1
• Time in Patent Office: 1,314 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0825 with collision detection
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The method includes: an intercepting station detecting a first radio signal of a third-party station and updating a local network allocation vector and/or response indication deferral; triggering a channel contention access procedure when determining that a second radio signal of the third-party station meets a spatial orthogonal condition, and then completing data transmission within updated time. In the case that the network allocation vector or response indication deferral is not 0, the third-party station ignoring or resetting the network allocation vector or the response indication deferral when determining that a sector transmission in a transmission initiated by the station is orthogonal with a transmission space to be carried out by itself, the third-party station initiating a contention and starting the spatial orthogonal transmission within a duration indicated by the updated network allocation vector or the response indication deferral.

Claims

1. A channel access method under spatial reuse, comprising:

an intercepting station detecting a first radio signal of a third-party station, updating a local network allocation vector and/or a response indication deferral;

triggering a channel contention access procedure when determining that a second radio signal of the third-party station meets a spatial orthogonal condition, and then completing a data transmission within a duration indicated after updating.

2. The channel access method of claim 1, wherein, at the expiry of a timer indicated by the updated local network allocation vector or response indication deferral, the method further comprises:

the intercepting station restoring a state of a random backoff procedure saved in a triggered channel contention access procedure as a current random backoff procedure.

3. The channel access method of claim 2, wherein, said triggering a channel contention comprises:

saving a state of an existing backoff procedure;

starting a new backoff procedure and contending for a channel to transmit.

4. The channel access method of claim 2, wherein, said determining that a second radio signal of a third-party station meets a spatial orthogonal condition is:

not detecting the second radio signal of the third-party station within a preset time interval Δ

t after an end of the intercepting station detecting the first radio signal of the third-party station.

5. The channel access method of claim 2, wherein, the first radio signal is a radio signal of radio frames or a part of the radio frames that can be received by the intercepting station;

the second radio signal is a radio signal of radio frames or a part of the radio frames that cannot be received by the intercepting station.

6. The channel access method of claim 1, wherein, the first radio signal is a radio signal of radio frames or a part of the radio frames that can be received by the intercepting station;

the second radio signal is a radio signal of radio frames or a part of the radio frames that cannot be received by the intercepting station.

7. The channel access method of claim 6, wherein, the first radio signal is transmitted in an omnidirectional mode;

the second radio signal is transmitted in a directional or sectorization or beamforming mode.

8. The channel access method of claim 1, wherein, said triggering a channel contention comprises:

saving a state of an existing backoff procedure;

starting a new backoff procedure and contending for a channel to transmit.

9. The channel access method of claim 1, wherein, said determining that a second radio signal of a third-party station meets a spatial orthogonal condition is:

not detecting the second radio signal of the third-party station within a preset time interval Δ

t after an end of the intercepting station detecting the first radio signal of the third-party station.

10. The channel access method of claim 9, wherein, the method further comprises:

the intercepting station setting a channel carrier detection result as idle.

11. The channel access method of claim 9, wherein, the preset time interval Δ

t starts at an omnidirectional beam to sector beam conversion time point;

the length of the preset time interval Δ

t is a duration of one or more transmission symbols;

or, the length of the preset time interval Δ

t is the value of a summation of one short interframe space and one slot, plus the value of one receiving start delay.

12. The channel access method of claim 1, wherein, when what is updated is the local network allocation vector, the duration indicated after updating is:

a duration indicated by the updated local network allocation vector;

when what is updated is the response indication deferral, the duration indicated after updating is;

a duration indicated by the updated response indication deferral;

when what is updated are the local network allocation vector and the response indication deferral, the duration indicated after updating is;

the duration indicated by the updated local network allocation vector;

or a longer one of durations indicated by the updated local network allocation vector and the updated response indication deferral.

13. A station, comprising hardware performing instructions stored in a non-transitory computer readable medium which executes steps in following modules:

an updating modules, configured to, update a local network allocation vector and/or a response indication deferral when detecting a first radio signal of a third party station;

a triggering module, configured to, trigger a channel contention access procedure when determining that a second radio signal of a third-party station meets a spatial orthogonal condition, and then complete a data transmission within updated duration.

14. The station of claim 13, wherein the hardware further performs instructions stored in a non-transitory computer readable medium which executes steps in following module:

a restoring module, configured to, at the expiry of a timer indicated by the updated local network allocation vector or response indication deferral,

restore a state of a random backoff procedure saved in a triggered channel contention transmission as a current random backoff procedure.

15. The station of claim 14, wherein, the first radio signal is a radio signal of radio frames or a part of the radio frames that can be received by the station and is sent in an omnidirectional mode;

the second radio signal is a radio signal of radio frames or a part of the radio frames that cannot be received by the station and is sent in a directional or sectorization or beamforming mode.

16. The station of claim 13, wherein, the first radio signal is a radio signal of radio frames or a part of the radio frames that can be received by the station and is sent in an omnidirectional mode;

the second radio signal is a radio signal of radio frames or a part of the radio frames that cannot be received by the station and is sent in a directional or sectorization or beamforming mode.

17. The station of claim 13, wherein, said triggering a channel contention is saving a state of an existing backoff procedure;

starting a new backoff procedure and contending for a channel to transmit.

18. The station of claim 13, wherein, said determining that the second radio signal of the third-party station meets a spatial orthogonal condition is:

not detecting the second radio signal of the third-party station within a preset time interval Δ

t after an end of the station detecting the first radio signal of the third-party station.

19. The station of claim 18, wherein the hardware further performs instructions stored in a non-transitory computer readable medium which executes steps in following module:

a setting modul, configured to set a channel carrier detection result as idle.

20. The station of claim 18, wherein, the preset time interval Δ

t starts at an omnidirectional beam to sector beam conversion time point;

the length of the preset time interval Δ

t is a duration of one or more transmission symbols;

or, the length of the preset time interval Δ

t is the value of a summation of one short interframe space and one slot, plus the value of one receiving start delay.