WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION NODE, AND CHANNEL DETECTION METHOD

• US 20170303167A1
• Filed: 06/22/2017
• Published: 10/19/2017
• Est. Priority Date: 12/23/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Luo, Jun, Loc, Peter, Lan, Zhou
• Granted Patent: US 10,448,284 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 41/083 for increasing network speed
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 40/24 Connectivity information management, e.g. connectivity discovery or connectivity update
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A wireless communication apparatus includes, a transceiver module performs data transmission; and a processing module selects a channel whose bandwidth is a to-be-detected bandwidth from a WLAN system. If there is no idle channel, detection is performed again after the to-be-detected bandwidth is reduced.

Claims

1. A wireless communication apparatus, comprising:

a transceiver configured to perform data transmission; and

a processor configured to;

(a) select a channel whose bandwidth is a to-be-detected bandwidth from the WLAN system, wherein the to-be-detected bandwidth is an integer multiple of a basic bandwidth of the WLAN system, and an initial value is greater than the basic bandwidth of the WLAN system,

(b) detect whether the selected channel whose bandwidth is the to-be-detected bandwidth is idle,

(c) when a detection result is idle, control the transceiver to use the channel to perform data transmission, or when a detection result is busy, select another channel whose bandwidth is the to-be-detected bandwidth from the WLAN system and return to the step (b), and

when it is detected that all selected channels whose bandwidth is the to-be-detected bandwidth in the WLAN system are busy, and the to-be-detected bandwidth is greater than the basic bandwidth of the WLAN system, reduce the to-be-detected bandwidth and return to the step (a).

2. The apparatus according to claim 1, wherein:

the to-be-detected bandwidth is 2ⁿ times the basic bandwidth, and a system bandwidth of the WLAN system is 2^m times the basic bandwidth, wherein n and m are integers, and 0≦

n≦

m.

3. The apparatus according to claim 2, wherein:

a system frequency band of the WLAN system includes 2^m basic frequency bands, a bandwidth of the basic frequency band is the basic bandwidth of the WLAN system, and a bandwidth of the system frequency band is the system bandwidth of the WLAN system; and

the channel whose bandwidth is the to-be-detected bandwidth includes the following frequency band;

one frequency band in 2^m-n frequency bands obtained by averagely dividing the system frequency band.

4. The apparatus according to claim 1, wherein the channel whose bandwidth is the to-be-detected bandwidth includes one or multiple consecutive basic frequency bands or includes multiple discrete basic frequency bands.

5. The apparatus according to claim 1, wherein the processor is further configured to:

select the channel whose bandwidth is the to-be-detected bandwidth from the WLAN system by using a sliding window method, wherein a width of a sliding window in the sliding window method is the to-be-detected bandwidth.

6. The apparatus according to claim 1, wherein the processor is further configured to:

determine, according to signal energy detected on the channel and the to-be-detected bandwidth, whether the selected channel whose bandwidth is the to-be-detected bandwidth is idle.

7. The apparatus according to claim 6, wherein the processor is configured to:

determine an energy value according to the system bandwidth and the to-be-detected bandwidth of the WLAN system, wherein the determined energy value meets the following formula requirement;

8. The apparatus according to claim 2, wherein:

the system bandwidth of the WLAN system is 160 MHZ, and the basic bandwidth of the WLAN system is 20 MHZ; and

the processor is further configured to;

if the to-be-detected bandwidth is 160 MHz, when signal energy detected on the channel is not less than −

73 dBm, determine that the channel is busy, or when signal energy detected on the channel is less than −

73 dBm, determine that the channel is idle, or

if the to-be-detected bandwidth is 80 MHz, when signal energy detected on the channel is not less than −

76 dBm, determine that the channel is busy, or when signal energy detected on the channel is less than −

76 dBm, determine that the channel is idle;

or

if the to-be-detected bandwidth is 40 MHz, when signal energy detected on the channel is not less than −

79 dBm, determine that the channel is busy, or when signal energy detected on the channel is less than −

79 dBm, determine that the channel is idle, or

if the to-be-detected bandwidth is 20 MHz, when signal energy detected on the channel is not less than −

82 dBm, determine that the channel is busy, or when signal energy detected on the channel is less than −

82 dBm, determine that the channel is idle.

9. A channel detection method, comprising:

selecting a channel whose bandwidth is a to-be-detected bandwidth from a WLAN system, wherein the to-be-detected bandwidth is an integer multiple of a basic bandwidth of the WLAN system, and an initial value is greater than the basic bandwidth of the WLAN system;

detecting whether the selected channel whose bandwidth is the to-be-detected bandwidth is idle;

when a detection result is idle, using the channel to perform data transmission, or when a detection result is busy, selecting another channel whose bandwidth is the to-be-detected bandwidth from the WLAN system, and returning to the step of detecting whether the selected channel whose bandwidth is the to-be-detected bandwidth is idle; and

when it is detected that all selected channels whose bandwidth is the to-be-detected bandwidth in the WLAN system are busy, and the to-be-detected bandwidth is greater than the basic bandwidth of the WLAN system, reducing the to-be-detected bandwidth and returning to the step of selecting a channel.

10. The method according to claim 9, wherein the to-be-detected bandwidth is 2ⁿ times the basic bandwidth, and a system bandwidth of the WLAN system is 2^m times the basic bandwidth, wherein n and m are integers, and 0≦

n≦

m.

11. The method according to claim 10, wherein:

a system frequency band of the WLAN system includes 2^m basic frequency bands, a bandwidth of the basic frequency band is the basic bandwidth of the WLAN system, and a bandwidth of the system frequency band is the system bandwidth of the WLAN system; and

the channel whose bandwidth is the to-be-detected bandwidth includes the following frequency band;

one frequency band in 2^m-n frequency bands obtained by averagely dividing the system frequency band.

12. The method according to claim 9, wherein the channel whose bandwidth is the to-be-detected bandwidth includes one or multiple consecutive basic frequency bands or includes multiple discrete basic frequency bands.

13. The method according to claim 9, wherein selecting a channel whose bandwidth is a to-be-detected bandwidth from a WLAN system comprises:

selecting the channel whose bandwidth is the to-be-detected bandwidth from the WLAN system by using a sliding window method, wherein a width of a sliding window in the sliding window method is the to-be-detected bandwidth.

14. The method according to claim 9, wherein detecting whether the selected channel whose bandwidth is the to-be-detected bandwidth is idle comprises:

determining, according to signal energy detected on the channel and the to-be-detected bandwidth, whether the selected channel whose bandwidth is the to-be-detected bandwidth is idle.

15. The method according to claim 14, wherein determining, according to signal energy detected on the channel and the to-be-detected bandwidth, whether the selected channel whose bandwidth is the to-be-detected bandwidth is idle comprises:

determining an energy value according to the system bandwidth and the to-be-detected bandwidth of the WLAN system, wherein the determined energy value meets the following formula requirement;

16. The method according to claim 10, wherein:

the system bandwidth of the WLAN system is 160 MHZ, and the basic bandwidth of the WLAN system is 20 MHZ; and

the detecting whether the selected channel whose bandwidth is the to-be-detected bandwidth is idle comprises;

if the to-be-detected bandwidth is 160 MHz, when signal energy detected on the channel is not less than −

73 dBm, determining that the channel is busy, or when signal energy detected on the channel is less than −

73 dBm, determining that the channel is idle, or

if the to-be-detected bandwidth is 80 MHz, when signal energy detected on the channel is not less than −

76 dBm, determining that the channel is busy, or when signal energy detected on the channel is less than −

76 dBm, determining that the channel is idle, or

if the to-be-detected bandwidth is 40 MHz, when signal energy detected on the channel is not less than −

79 dBm, determining that the channel is busy, or when signal energy detected on the channel is less than −

79 dBm, determining that the channel is idle, or

if the to-be-detected bandwidth is 20 MHz, when signal energy detected on the channel is not less than −

82 dBm, determining that the channel is busy, or when signal energy detected on the channel is less than −

82 dBm, determining that the channel is idle.