WO2016054938A1 - 一种用于无线通信系统中的空闲信道检测方法和系统 - Google Patents

一种用于无线通信系统中的空闲信道检测方法和系统 Download PDF

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WO2016054938A1
WO2016054938A1 PCT/CN2015/084126 CN2015084126W WO2016054938A1 WO 2016054938 A1 WO2016054938 A1 WO 2016054938A1 CN 2015084126 W CN2015084126 W CN 2015084126W WO 2016054938 A1 WO2016054938 A1 WO 2016054938A1
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channel
data
idle
threshold
transmission
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PCT/CN2015/084126
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English (en)
French (fr)
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孙波
吕开颖
张力
方永刚
田开波
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中兴通讯股份有限公司
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Priority to EP15849063.1A priority Critical patent/EP3206313B1/en
Priority to EP22172651.6A priority patent/EP4099588A1/en
Priority to US15/518,056 priority patent/US10045239B2/en
Publication of WO2016054938A1 publication Critical patent/WO2016054938A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/26—Monitoring; Testing of receivers using historical data, averaging values or statistics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • This paper relates to the field of channel detection, and more particularly to a method and system for detecting idle channels in a wireless communication system.
  • WLANs wireless local area networks
  • the demand for WLAN coverage is increasing
  • WLAN applications are more extensive
  • the deployment density of WLANs is rapidly increasing.
  • the IEEE 802.11 technology defines a basic service set (BSS) consisting of an access point (AP) and a plurality of stations (Stations, referred to as STAs) associated with the AP.
  • BSS basic service set
  • AP access point
  • STAs stations
  • the site uses CSMA/CA (CSMA with Collision Avoidance) with collision avoidance to enable multiple sites to share wireless channels.
  • CSMA/CA CSMA with Collision Avoidance
  • the working principle of CSMA/CA is: the sender first detects whether the channel is idle. If it detects that the channel is idle, it waits for a random time before sending the data. If the receiver receives the frame correctly, after a period of time, The sender sends an acknowledgement frame ACK; the sender receives the ACK frame to determine that the data is correctly transmitted.
  • the station uses the physical carrier channel idle state detection technology (CCA) to detect whether the channel is idle before transmitting the radio frame, that is, detecting the signal interference level of the physical carrier channel within a period of time, when the signal interference level is higher than the standard.
  • CCA physical carrier channel idle state detection technology
  • the program first allows the site to set a level based on interference level measurements and engineering experience.
  • Temporary signal threshold when the transmitting station is close to the receiving station and farther away from the interfering station, the temporary signal threshold is increased, thereby increasing the probability of data transmission at the transmitting station, thereby Statistical performance can reduce the average data transmission delay and improve the average spectrum utilization.
  • MIMO technology supports the transmitter to transmit data with directional beamforming technology.
  • the sender can concentrate the transmitted signal energy in a small space, improve transmission performance and transmission distance, and cause other stations outside the above space range.
  • the interference is very small. Since the relevant WLAN performs channel idle detection, the channel is only divided by frequency, and the channel is not divided by space. If the relevant channel idle detection is used in the MIMO-WLAN network, once the channel is detected to be busy, the transmitting end stops transmitting data.
  • the transmitting end adopting MIMO technology may only be subjected to large interference from other stations in a certain direction, and if the data is stopped in each sending direction, the probability of data transmission of the transmitting station is undoubtedly lowered.
  • the technical problem to be solved by the present invention is to provide a method and system for detecting an idle channel in a wireless communication system to solve the technical problem of how to increase the probability of data transmission at a transmitting station.
  • An idle channel detection method is applied to a wireless communication system, and the method includes:
  • Channel measurement is performed on a channel required to transmit data by beamforming, and a channel in an idle state is determined.
  • the channel required for transmitting data by beamforming is a transmission channel between the transmitting station and the receiving station, located at a set transmission angle or a set receiving angle, and within a set frequency range.
  • the step of performing channel measurement on a channel required to transmit data by beamforming includes:
  • the wireless signal strength is an average of signal strengths within a preset time period.
  • the performing channel measurement on a channel required for beamforming transmission data, and determining the channel in an idle state includes:
  • the threshold A1 and the threshold A2 are set according to a transmission bandwidth.
  • the performing channel measurement on a channel required for beamforming transmission data, and determining the channel in an idle state includes:
  • the transmit power When transmitting the beamforming data with variable power, calculating a transmit power of the beamforming data that satisfies the set modulation coding rate; if the transmit power is the transmit power supported by the transmitting station, and detecting the transmit direction of the data to be transmitted If the opposite signal strength is less than or equal to the threshold A1, and it is detected that the same signal strength as the transmission direction of the data to be transmitted is less than or equal to the threshold A2, it is determined that the channel is in an idle state, wherein the threshold A1 and the threshold A2 are according to the transmission bandwidth. Settings.
  • the method further includes:
  • the threshold A1 and the threshold A2 are lowered;
  • the threshold A1 and the threshold A2 are increased when it is detected that the number of stations on the channel required to transmit data by beamforming is reduced.
  • the step of calculating the transmit power of the beamforming data that meets the set modulation coding rate includes:
  • Obtaining indication information from the receiving station where the indication information includes: a sending power level of the wireless frame transmitted by the receiving party and a receiving power of the receiving wireless frame;
  • the transmission power level of the transmitted radio frame, P_RX is the received power of the receiver radio frame, and DELTA is the correction factor, including the antenna gain and antenna loss.
  • the method further includes:
  • the transmission opportunity After determining the channel in the idle state, the transmission opportunity is contending according to the channel contention access mechanism on the idle channel, and the data is transmitted after competing for the transmission opportunity.
  • the step of contending for the transmission opportunity according to the channel contention access mechanism on the idle channel, and transmitting the data after competing to the transmission opportunity includes:
  • the transmission opportunity is contending according to the channel contention access mechanism on each of the idle channels, and the data is transmitted on the corresponding channel after competing for the transmission opportunity;
  • the transmission opportunity is contending according to the channel contention access mechanism on one of the idle channels, and the data is transmitted on each of the idle channels after competing for the transmission opportunity.
  • An idle channel detection system is applied to a wireless communication system, the system comprising: a channel measurement module and an idle channel determination module, wherein:
  • the channel measurement module is configured to: perform channel measurement on a channel required to transmit data by beamforming;
  • the idle channel determining module is configured to determine a channel in an idle state according to a channel measurement result.
  • the channel required for transmitting data by beamforming is a transmission channel between the transmitting station and the receiving station at a set transmission/reception angle and within a set frequency range.
  • the channel measurement module is configured to perform channel measurement on a channel required to transmit data by beamforming as follows:
  • the wireless signal sensing and the wireless signal receiving intensity measurement are performed on the channel; the wireless signal strength is an average of the signal strengths in the preset time period.
  • the idle channel determining module is configured to determine a channel in an idle state according to the channel measurement result as follows:
  • the threshold A1 and the threshold A2 are set according to the transmission bandwidth.
  • the idle channel determining module is configured to determine a channel in an idle state according to the channel measurement result as follows:
  • the transmit power When transmitting the beamforming data with variable power, calculating a transmit power of the beamforming data that satisfies the set modulation coding rate; if the transmit power is the transmit power supported by the transmitting station, and detecting the transmit direction of the data to be transmitted If the opposite signal strength is less than or equal to the threshold A1, and it is detected that the same signal strength as the transmission direction of the data to be transmitted is less than or equal to the threshold A2, it is determined that the channel is in an idle state, and the threshold A1 and the threshold A2 are set according to the transmission bandwidth.
  • the idle channel determining module is further configured to:
  • the threshold A1 and the threshold A2 are lowered;
  • the threshold A1 and the threshold A2 are increased when it is detected that the number of stations on the channel required to transmit data by beamforming is reduced.
  • the idle channel determining module is configured to calculate a transmit power of the beamforming data that satisfies the set modulation coding rate as follows:
  • Obtaining indication information from the receiving station where the indication information includes: a sending power level of the wireless frame transmitted by the receiving party and a receiving power of the receiving wireless frame;
  • P_TX2 is the transmit power
  • RX_MCS is the sensitivity corresponding to the specified modulation and coding rate set (MCS)
  • P_TX1 is the transmit by the receiver.
  • the transmission power level of the radio frame P_RX is the received power of the receiver radio frame
  • DELTA is the correction factor, including the antenna gain and antenna loss.
  • the system further includes a data transmission module, wherein
  • the data transmission module is configured to: after the channel in the idle state is determined, compete for the transmission opportunity according to the channel contention access mechanism on the idle channel, and transmit the data after competing for the transmission opportunity.
  • the data transmission module is configured to compete for the transmission opportunity according to the channel contention access mechanism on the idle channel according to the following manner, and transmit the data after competing to the transmission opportunity:
  • the transmission opportunity is contending according to the channel contention access mechanism on each of the idle channels, and the data is transmitted on the corresponding channel after competing for the transmission opportunity;
  • the transmission opportunity is contending according to the channel contention access mechanism on one of the idle channels, and the data is transmitted on each of the idle channels after competing for the transmission opportunity.
  • a computer program comprising program instructions which, when executed by a computer, cause the computer to perform any of the above described idle channel detection methods.
  • FIG. 1 is a flowchart of a method for detecting a clear channel according to an embodiment of the present invention
  • FIG. 2 is a structural diagram of the idle channel detecting system of the embodiment.
  • FIG. 1 is a flowchart of a method for detecting an idle channel according to an embodiment of the present invention.
  • S101 performs channel measurement on a channel required to transmit data by beamforming
  • the channel required for transmitting data by beamforming is a transmission channel between the transmitting station and the receiving station at a set transmission/reception angle and within a set frequency range;
  • the channel measurement includes performing wireless signal sensing and wireless signal receiving strength measurement on a channel, where the wireless signal strength is an average value of signal strengths in a preset time period;
  • channel measurements are performed on the channels required to transmit data by beamforming, including:
  • the threshold A1 and the threshold A2 are set according to a transmission bandwidth
  • the transmit power When transmitting the beamforming data with variable power, calculating a transmit power of the beamforming data that satisfies the set modulation coding rate; if the transmit power is the transmit power supported by the transmitting station, and detecting the transmit direction of the data to be transmitted If the opposite signal strength is less than or equal to the threshold A1, and it is detected that the same signal strength as the transmission direction of the data to be transmitted is less than or equal to the threshold A2, it is determined that the channel is in an idle state, and the threshold A1 and the threshold A2 are set according to the transmission bandwidth;
  • the calculating the transmit power of the beamforming data that meets the set modulation coding rate including:
  • Obtaining indication information from the receiving station where the indication information includes: a sending power level of the wireless frame transmitted by the receiving party, and a receiving power of the receiving wireless frame;
  • P_TX2 is the transmit power
  • RX_MCS is the sensitivity corresponding to the specified modulation coding rate set MCS
  • P_TX1 is a transmission power level at which the receiver transmits a radio frame
  • P_RX is the received power of the receiver radio frame
  • DELTA is a correction factor, including antenna gain and antenna loss
  • the above threshold A1 and threshold A2 can be dynamically adjusted according to the transmission bandwidth, and can also be adjusted according to the number of stations on the channel: when the number of stations on the channel required to transmit data by beamforming is increased, the threshold A1 and the threshold are lowered. A2; when it is detected that the number of stations on the channel required for transmitting data by beamforming is reduced, the threshold A1 and the threshold A2 are increased; by dynamically adjusting the threshold A1 and the threshold A2, it is possible to increase the transmission data when the channel transmission condition is good. Probability of reducing the probability of transmitting data if the channel transmission conditions are degraded;
  • S102 determines a channel in an idle state according to the measurement result.
  • the transmission opportunity is contending according to the channel contention access mechanism (such as the CSMA/CA mechanism) on the idle channel, and the data is transmitted after competing for the transmission opportunity.
  • the channel contention access mechanism such as the CSMA/CA mechanism
  • the contending for the transmission opportunity according to the channel contention access mechanism on the idle channel, and transmitting the data after competing to the transmission opportunity including:
  • the transmission opportunity is contending according to the channel contention access mechanism on each idle channel, and the data is transmitted on the corresponding channel after competing for the transmission opportunity;
  • the transmission opportunity is contending according to the channel contention access mechanism on one of the idle channels, and the data is transmitted on each of the idle channels after competing for the transmission opportunity.
  • the first method it is highly likely that the data is collided on the channel other than the channel competing for the transmission opportunity, but since it reduces the operation of competing for the transmission opportunity on the plurality of channels, the complexity is reduced.
  • channel measurement is performed on the channel required for beamforming and transmitting data to determine the channel idle state, which can effectively control data transmission on each channel, thereby effectively preventing data collision and improving.
  • the data transmission efficiency when the station transmits data by using the beamforming technology, channel measurement is performed on the channel required for beamforming and transmitting data to determine the channel idle state, which can effectively control data transmission on each channel, thereby effectively preventing data collision and improving.
  • the transmitting station transmits beamforming data at a fixed power.
  • the transmitting station performs channel measurement on the channel required for beamforming data transmission, determines whether the channel is in an idle state, and determines that the channel is in an idle state:
  • the threshold A1 and the threshold A2 are set according to the transmission bandwidth; the threshold A1 and the threshold A2 can be dynamically adjusted according to the transmission bandwidth, and Adjusting according to the number of stations on the channel: when detecting the increase in the number of stations on the channel required to transmit data by beamforming, lowering the threshold A1 and the threshold A2; when detecting the number of stations on the channel required to transmit data by beamforming is reduced Raising the threshold A1 and the threshold A2;
  • the transmitting station After determining the channel in the idle state, the transmitting station contends for the transmission opportunity according to the channel contention access mechanism (such as the CSMA/CA mechanism) on the idle channel, and transmits the number after competing to the transmission opportunity. according to.
  • the channel contention access mechanism such as the CSMA/CA mechanism
  • Application Example 2 The transmitting station transmits beamforming data at variable power.
  • the transmitting station performs channel measurement on the channel required for beamforming data transmission, determines whether the channel is in an idle state, and determines that the channel is in an idle state:
  • the calculating the transmit power of the beamforming data that meets the set modulation coding rate includes:
  • Obtaining indication information from the receiving station where the indication information includes: a sending power level of the wireless frame transmitted by the receiving party, and a receiving power of the receiving wireless frame;
  • P_TX2 is the transmit power
  • RX_MCS is the sensitivity corresponding to the specified modulation coding rate set MCS
  • P_TX1 is a transmission power level at which the receiver transmits a radio frame
  • P_RX is the received power of the receiver radio frame
  • DELTA is a correction factor, including antenna gain and antenna loss
  • the threshold A1 and the threshold A2 are set according to the transmission bandwidth; the threshold A1 and the threshold A2 are dynamically adjusted according to the transmission bandwidth. It can also be adjusted according to the number of stations on the channel: when the number of stations on the channel required to transmit data by beamforming is increased, the threshold A1 and the threshold A2 are lowered; when the channel required for transmitting data by beamforming is detected Increase the threshold A1 and gate when the number of sites decreases Limit A2;
  • the transmitting station After determining the channel in the idle state, the transmitting station contends for the transmission opportunity according to the channel contention access mechanism (such as the CSMA/CA mechanism) on the idle channel, and transmits the data after competing for the transmission opportunity.
  • the channel contention access mechanism such as the CSMA/CA mechanism
  • the transmitting station transmits beamforming data to a plurality of receiving stations at a fixed power.
  • the transmitting station performs channel measurement on the channel required for beamforming data transmission, determines whether the channel is in an idle state, and determines that the channel is in an idle state:
  • the threshold A1 and the threshold A2 are set according to the transmission bandwidth; the threshold A1 and the threshold A2 can be dynamically adjusted according to the transmission bandwidth, and Adjusting according to the number of stations on the channel: when detecting the increase in the number of stations on the channel required to transmit data by beamforming, lowering the threshold A1 and the threshold A2; when detecting the number of stations on the channel required to transmit data by beamforming is reduced Raising the threshold A1 and the threshold A2;
  • the transmitting station After determining the channel in the idle state, the transmitting station contends for the transmission opportunity according to the channel contention access mechanism (such as the CSMA/CA mechanism) on the idle channel, and transmits data after competing for the transmission opportunity: if there are many channels in the idle state Striping, contending for the transmission opportunity according to the channel contention access mechanism on each idle channel, and transmitting data on the corresponding channel after competing for the transmission opportunity; or contending for the transmission opportunity according to the channel competition access mechanism on one of the idle channels And transmit data on each of the idle channels after competing to the transmission opportunity.
  • the channel contention access mechanism such as the CSMA/CA mechanism
  • FIG. 2 is a structural diagram of the idle channel detecting system of the embodiment.
  • the system includes: a channel measurement module and an idle channel determination module, wherein:
  • the channel measurement module 201 is configured to: perform a signal on a channel required to transmit data by beamforming Road measurement
  • the channel required for transmitting data by beamforming is a transmission channel between the transmitting station and the receiving station at a set transmission/reception angle and within a set frequency range;
  • the channel measurement module 201 is configured to: perform channel measurement, including:
  • the wireless signal strength is an average of signal strengths in a preset time period
  • the idle channel determining module 202 is configured to determine a channel in an idle state according to the channel measurement result.
  • the idle channel determining module 202 is configured to: determine, according to the channel measurement result, the channel in an idle state, including:
  • the threshold A1 and the threshold A2 are set according to a transmission bandwidth
  • the transmit power When transmitting the beamforming data with variable power, calculating a transmit power of the beamforming data that satisfies the set modulation coding rate; if the transmit power is the transmit power supported by the transmitting station, and detecting the transmit direction of the data to be transmitted If the opposite signal strength is less than or equal to the threshold A1, and it is detected that the same signal strength as the transmission direction of the data to be transmitted is less than or equal to the threshold A2, it is determined that the channel is in an idle state, and the threshold A1 and the threshold A2 are set according to the transmission bandwidth.
  • the calculating the transmit power of the beamforming data that meets the set modulation coding rate including:
  • Obtaining indication information from the receiving station where the indication information includes: a sending power level of the wireless frame transmitted by the receiving party, and a receiving power of the receiving wireless frame;
  • P_TX2 is the transmit power
  • RX_MCS is the sensitivity corresponding to the specified modulation coding rate set (MCS);
  • P_TX1 is a transmission power level at which the receiver transmits a radio frame
  • P_RX is the received power of the receiver radio frame
  • DELTA is a correction factor, including antenna gain and antenna loss
  • the threshold A1 and the threshold A2 may be dynamically adjusted according to the transmission bandwidth, and may be adjusted according to the number of stations on the channel.
  • the idle channel determining module 202 is further configured to: when detecting the channel required for transmitting data by beamforming When the number of stations increases, the threshold A1 and the threshold A2 are lowered; when the number of stations on the channel required to transmit data by beamforming is reduced, the threshold A1 and the threshold A2 are increased; and the threshold A1 and the threshold A2 are dynamically adjusted to implement the channel.
  • the transmission condition is good, the probability of transmitting data is increased, and when the channel transmission condition is deteriorated, the probability of transmitting data is reduced;
  • the system further includes a data transmission module configured to: after the channel in the idle state is determined, compete for the transmission opportunity on the idle channel according to the channel contention access mechanism (such as the CSMA/CA mechanism), and transmit the data after competing for the transmission opportunity.
  • the channel contention access mechanism such as the CSMA/CA mechanism
  • the transmission opportunity is contending according to the channel contention access mechanism on the idle channel, and the data is transmitted after competing to the transmission opportunity, including:
  • the transmission opportunity is contending according to the channel contention access mechanism on each of the idle channels, and the data is transmitted on the corresponding channel after competing for the transmission opportunity;
  • the transmission opportunity is contending according to the channel contention access mechanism on one of the idle channels, and the data is transmitted on each of the idle channels after competing for the transmission opportunity.
  • the first method it is highly likely that the data is collided on the channel other than the channel competing for the transmission opportunity, but since it reduces the operation of competing for the transmission opportunity on the plurality of channels, the complexity is reduced.
  • the embodiment of the invention also discloses a computer program, comprising program instructions, which when executed by a computer, enable the computer to perform any of the above idle channel detection methods.
  • the embodiment of the invention also discloses a carrier carrying the computer program.
  • the station transmits data by using beamforming technology
  • channel measurement is performed on the channel required for beamforming and transmitting data to determine the channel idle state, which can effectively control data transmission on each channel, thereby effectively preventing data collision and improving.
  • the data transmission efficiency Therefore, the present invention has strong industrial applicability.

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Abstract

一种用于无线通信系统中的空闲信道检测方法和系统，所述方法包括：对以波束成形传输数据所需的信道进行信道测量，确定处于空闲状态的信道。所述系统包括：信道测量模块，设置成：对以波束成形传输数据所需的信道进行信道测量；空闲信道确定模块，设置成：根据信道测量结果确定处于空闲状态的信道。本发明技术方案可以提高发送站点的数据发送概率。

Description

一种用于无线通信系统中的空闲信道检测方法和系统 技术领域
本文涉及信道检测领域，尤其涉及一种用于无线通信系统中的空闲信道检测方法和系统。
背景技术
目前，在无线网络领域，无线局域网(WLAN)快速发展，对WLAN覆盖的需求日益增长，WLAN的应用更加广泛，WLAN的部署密度也迅速提高。
IEEE 802.11技术定义由一个接入点(access point，AP)以及与AP相关联的多个站点(Station，简称STA)组成一个基本服务集(basic service set，简称BSS)。站点利用带有冲突避免的载波侦听多路访问机制CSMA/CA(CSMA with Collision Avoidance)使多个站点共享无线信道。CSMA/CA的工作原理是：发送端首先检测信道是否空闲，如果检测出信道空闲，则等待一段随机时间后，才送出数据；接收端如果正确收到此帧，则经过一段时间间隔后，向发送端发送确认帧ACK；发送端收到ACK帧，确定数据正确传输。
CAMA/CA技术中，站点在发送无线帧前使用物理载波信道空闲状态检测技术(CCA)检测信道是否空闲，即在一段时间内检测物理载波信道的信号干扰水平，当该信号干扰水平高于标准定义的固定门限值时，则认为载波信道的状态为忙；反之，当该信号干扰水平低于所述固定门限值时，则认为载波信道的状态位空闲可用。
使用上述CSMA/CA技术在检测信道是否空闲时，使用固定的判断门限，不能随着WLAN部署密度自适应改变，从而造成当站点之间的干扰减小时，站点不能提高发送数据概率，进而影响了频谱的利用效率。
为了解决该技术问题，相关技术中出现了允许根据所述一段时间内的物理载波信道的信号干扰水平测量结果动态调整判定信道空闲的门限值的技术方案。该方案中首先允许站点根据干扰水平测量结果以及工程经验设置一个 临时的信号门限值，当发送站点与接收站点距离较近，而与干扰站点距离较远时，提高上述临时的信号门限值，这样就提高了发送站点的数据发送概率，从而从整网统计性能上看能降低平均数据发送时延，提高平均频谱利用率。
随着多输入多输出(MIMO)技术发展，现在的WLAN系统中也引入了MIMO技术。MIMO技术支持发送端以具有方向性的波束成形技术传输数据，发送方可以将发送信号能量集中在一个较小的空间范围内，提高传输性能和传输距离，而对上述空间范围外的其他站点造成的干扰则非常小。由于相关的WLAN在进行信道空闲检测时，仅以频率划分信道，没有以空间划分信道，如果在MIMO-WLAN网络中采用相关的信道空闲检测，一旦检测到信道忙，发送端即会停止发送数据，但实际上，采用MIMO技术的发送端可能仅是某个方向受到来自其他站点的较大的干扰，如果在各个发送方向均停止发送数据，无疑又降低了发送站点的数据发送概率。
发明内容
本发明要解决的技术问题是提供一种用于无线通信系统中的空闲信道检测方法和系统，以解决如何提高发送站点的数据发送概率的技术问题。
为了达到上述目的，采用如下技术方案：
一种空闲信道检测方法，应用于无线通信系统中，所述方法包括：
对以波束成形传输数据所需的信道进行信道测量，确定处于空闲状态的信道。
可选地，所述以波束成形传输数据所需的信道为发送站点到接收站点间的、位于设定发送角度或设定接收角度、且在设定频率范围内的传输通道。
可选地，所述对以波束成形传输数据所需的信道进行信道测量的步骤包括：
在所述信道上进行无线信号侦听和无线信号接收强度测量，其中，所述无线信号强度为预设时间段内信号强度的平均值。
可选地，所述对以波束成形传输数据所需的信道进行信道测量，确定处于空闲状态的信道的步骤包括：
当以固定功率发射波束成形数据时，若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，并且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，其中，所述门限A1和门限A2根据传输带宽设置。
可选地，所述对以波束成形传输数据所需的信道进行信道测量，确定处于空闲状态的信道的步骤包括：
当以可变功率发射波束成形数据时，计算满足设定调制编码速率的波束成形数据的发射功率；若所述发射功率为本发送站点支持的发射功率，且检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，其中，所述门限A1和门限A2根据传输带宽设置。
可选地，该方法还包括：
当检测到以波束成形传输数据所需的信道上站点数增多时，降低所述门限A1和门限A2；
当检测到以波束成形传输数据所需的信道上站点数减少时，提高所述门限A1和门限A2。
可选地，所述计算满足设定调制编码速率的波束成形数据的发射功率的步骤包括：
从接收站点获取指示信息，其中，所述指示信息包括：接收方发送无线帧的发送功率等级和接收方无线帧的接收功率；
满足设定调制编码速率的波束成形数据的发射功率P_TX2为P_TX2＝RX_MCS+P_TX1-P_RX+DELTA；其中，P_TX2为发射功率，RX_MCS是指定调制编码速率集(MCS)对应的灵敏度，P_TX1是接收方发送无线帧的发送功率等级，P_RX是接收方无线帧的接收功率，DELTA是修正因子，包括天线增益和天线损耗。
可选地，所述方法还包括：
确定处于空闲状态的信道后，在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据。
可选地，所述在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据的步骤包括：
若处于空闲状态的信道有多条，在每条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后在相应的信道上传输数据；
若处于空闲状态的信道有多条，在其中一条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后，在每条空闲信道上传输数据。
一种空闲信道检测系统，应用于无线通信系统中，所述系统包括：信道测量模块和空闲信道确定模块，其中：
所述信道测量模块设置成：对以波束成形传输数据所需的信道进行信道测量；
所述空闲信道确定模块设置成：根据信道测量结果确定处于空闲状态的信道。
可选地，所述以波束成形传输数据所需的信道为发送站点到接收站点间的、位于设定发送/接收角度、在设定频率范围内的传输通道。
可选地，所述信道测量模块设置成按照如下方式对以波束成形传输数据所需的信道进行信道测量：
在信道上进行无线信号侦听和无线信号接收强度测量；所述无线信号强度为预设时间段内信号强度的平均值。
可选地，所述空闲信道确定模块设置成按照如下方式根据信道测量结果确定处于空闲状态的信道：
当以固定功率发射波束成形数据时，若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，并且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，所述门限A1和门限A2根据传输带宽设置。
可选地，所述空闲信道确定模块设置成按照如下方式根据信道测量结果确定处于空闲状态的信道：
当以可变功率发射波束成形数据时，计算满足设定调制编码速率的波束成形数据的发射功率；若所述发射功率为本发送站点支持的发射功率，且检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，所述门限A1和门限A2根据传输带宽设置。
可选地，所述空闲信道确定模块还设置成：
当检测到以波束成形传输数据所需的信道上站点数增多时，降低所述门限A1和门限A2；
当检测到以波束成形传输数据所需的信道上站点数减少时，提高所述门限A1和门限A2。
可选地，所述空闲信道确定模块设置成按照如下方式计算满足设定调制编码速率的波束成形数据的发射功率：
从接收站点获取指示信息，其中，所述指示信息包括：接收方发送无线帧的发送功率等级和接收方无线帧的接收功率；
满足设定调制编码速率的波束成形数据的发射功率为P_TX2＝RX_MCS+P_TX1-P_RX+DELTA；其中，P_TX2为发射功率，RX_MCS是指定调制编码速率集(MCS)对应的灵敏度，P_TX1是接收方发送无线帧的发送功率等级，P_RX是接收方无线帧的接收功率，DELTA是修正因子，包括天线增益和天线损耗。
可选地，该系统还包括数据传输模块，其中
所述数据传输模块设置成：在处于空闲状态的信道确定后，在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据。
可选地，所述数据传输模块设置成按照如下方式在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据：
若处于空闲状态的信道有多条，在每条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后在相应的信道上传输数据；
若处于空闲状态的信道有多条，在其中一条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后，在每条空闲信道上传输数据。
一种计算机程序，包括程序指令，当该程序指令被计算机执行时，使得该计算机可执行上述任意的空闲信道检测方法。
一种载有所述的计算机程序的载体。
上述技术方案，当站点以波束成形技术传输数据时，对以波束成形传输数据所需的信道进行信道测量确定信道空闲状态，可以有效控制各个信道上的数据传输，即有效避免了数据碰撞又提高了数据发送效率。
附图概述
图1为本实施例的空闲信道检测方法流程图；
图2为本实施例的空闲信道检测系统组成图。
本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
图1为本实施例的空闲信道检测方法流程图。
S101对以波束成形传输数据所需的信道进行信道测量；
所述以波束成形传输数据所需的信道为发送站点到接收站点间的、位于设定发送/接收角度、在设定频率范围内的传输通道；
所述信道测量包括在信道上进行无线信号侦听和无线信号接收强度测量，所述无线信号强度为预设时间段内信号强度的平均值；
可选地，对以波束成形传输数据所需的信道进行信道测量，包括：
当以固定功率发射波束成形数据时，若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，并且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，所述门限A1和门限A2根据传输带宽设置；
当以可变功率发射波束成形数据时，计算满足设定调制编码速率的波束成形数据的发射功率；若所述发射功率为本发送站点支持的发射功率，且检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，所述门限A1和门限A2根据传输带宽设置；
可选地，所述计算满足设定调制编码速率的波束成形数据的发射功率，包括：
从接收站点获取指示信息，所述指示信息包括：接收方发送无线帧的发送功率等级、接收方无线帧的接收功率；
满足设定调制编码速率的波束成形数据的发射功率为P_TX2＝RX_MCS+P_TX1-P_RX+DELTA；其中，
P_TX2为发射功率；
RX_MCS是指定调制编码速率集MCS对应的灵敏度；
P_TX1是接收方发送无线帧的发送功率等级；
P_RX是接收方无线帧的接收功率；
DELTA是修正因子，包括天线增益、天线损耗；
上述门限A1和门限A2除可根据传输带宽进行动态调节外，还可根据信道上的站点数进行调节:当检测到以波束成形传输数据所需的信道上站点数增多时，降低门限A1和门限A2；当检测到以波束成形传输数据所需的信道上站点数减少时，提高门限A1和门限A2；通过动态调节门限A1和门限A2，可实现在信道传输条件好的情况下，增加发送数据的概率，在信道传输条件变差的情况下，减少发送数据的概率；
S102根据测量结果，确定处于空闲状态的信道。
上述实施例中，当确定处于空闲状态的信道后，在空闲信道上按照信道竞争接入机制(如CSMA/CA机制)竞争发送机会，并在竞争到发送机会后传输数据。
可选地，所述在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据，包括：
方式一，若处于空闲状态的信道有多条，在每条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后在相应的信道上传输数据；
或，
方式二，若处于空闲状态的信道有多条，在其中一条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后，在每条空闲信道上传输数据。相对于方式一，在除竞争到发送机会的信道以外的信道上传输数据发生碰撞的可能性较大，但由于其减少了在多个信道上竞争发送机会的操作，减小了复杂度。
上述实施例，当站点以波束成形技术传输数据时，对以波束成形传输数据所需的信道进行信道测量确定信道空闲状态，可以有效控制各个信道上的数据传输，即有效避免了数据碰撞又提高了数据发送效率。
下面以3个具体的应用示例对上述实施例进行进一步说明。
应用示例1：发送站点以固定功率发射波束成形数据。
发送站点对以波束成形传输数据所需的信道进行信道测量，确定信道是否处于空闲状态，确定信道处于空闲状态的条件为：
1)若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1；
2)若检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2；
当同时满足上述条件1)和2)时，可以确定信道处于空闲状态，其中所述门限A1和门限A2根据传输带宽设置；上述门限A1和门限A2除可根据传输带宽进行动态调节外，还可根据信道上的站点数进行调节:当检测到以波束成形传输数据所需的信道上站点数增多时，降低门限A1和门限A2；当检测到以波束成形传输数据所需的信道上站点数减少时，提高门限A1和门限A2；
发送站点当确定处于空闲状态的信道后，在空闲信道上按照信道竞争接入机制(如CSMA/CA机制)竞争发送机会，并在竞争到发送机会后传输数 据。
应用示例2：发送站点以可变功率发射波束成形数据。
发送站点对以波束成形传输数据所需的信道进行信道测量，确定信道是否处于空闲状态，确定信道处于空闲状态的条件为：
1)若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1；
2)若检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2；
3)计算满足设定调制编码速率的波束成形数据的发射功率，若所述发射功率为本发送站点支持的发射功率；
所述计算满足设定调制编码速率的波束成形数据的发射功率，包括：
从接收站点获取指示信息，所述指示信息包括：接收方发送无线帧的发送功率等级、接收方无线帧的接收功率；
满足设定调制编码速率的波束成形数据的发射功率为P_TX2＝RX_MCS+P_TX1-P_RX+DELTA；其中，
P_TX2为发射功率；
RX_MCS是指定调制编码速率集MCS对应的灵敏度；
P_TX1是接收方发送无线帧的发送功率等级；
P_RX是接收方无线帧的接收功率；
DELTA是修正因子，包括天线增益、天线损耗；
当同时满足上述条件1)、2)和3)时，可以确定信道处于空闲状态，其中所述门限A1和门限A2根据传输带宽设置；上述门限A1和门限A2除可根据传输带宽进行动态调节外，还可根据信道上的站点数进行调节:当检测到以波束成形传输数据所需的信道上站点数增多时，降低门限A1和门限A2；当检测到以波束成形传输数据所需的信道上站点数减少时，提高门限A1和门 限A2；
发送站点当确定处于空闲状态的信道后，在空闲信道上按照信道竞争接入机制(如CSMA/CA机制)竞争发送机会，并在竞争到发送机会后传输数据。
应用示例3：发送站点以固定功率向多个接收站点发射波束成形数据。
发送站点对以波束成形传输数据所需的信道进行信道测量，确定信道是否处于空闲状态，确定信道处于空闲状态的条件为：
1)若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1；
2)若检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2；
当同时满足上述条件1)和2)时，可以确定信道处于空闲状态，其中所述门限A1和门限A2根据传输带宽设置；上述门限A1和门限A2除可根据传输带宽进行动态调节外，还可根据信道上的站点数进行调节:当检测到以波束成形传输数据所需的信道上站点数增多时，降低门限A1和门限A2；当检测到以波束成形传输数据所需的信道上站点数减少时，提高门限A1和门限A2；
发送站点当确定处于空闲状态的信道后，在空闲信道上按照信道竞争接入机制(如CSMA/CA机制)竞争发送机会，并在竞争到发送机会后传输数据：若处于空闲状态的信道有多条，在每条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后在相应的信道上传输数据；或，在其中一条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后，在每条空闲信道上传输数据。
图2为本实施例的空闲信道检测系统组成图。
该系统包括：信道测量模块和空闲信道确定模块，其中：
信道测量模块201，设置成：对以波束成形传输数据所需的信道进行信 道测量；
所述以波束成形传输数据所需的信道为发送站点到接收站点间的、位于设定发送/接收角度、在设定频率范围内的传输通道；
可选地，信道测量模块201，设置成：进行信道测量，包括：
在信道上进行无线信号侦听和无线信号接收强度测量；所述无线信号强度为预设时间段内信号强度的平均值；
空闲信道确定模块202，设置成：根据信道测量结果确定处于空闲状态的信道。
可选地，空闲信道确定模块202，设置成：根据信道测量结果确定处于空闲状态的信道，包括：
当以固定功率发射波束成形数据时，若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，并且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，所述门限A1和门限A2根据传输带宽设置；
当以可变功率发射波束成形数据时，计算满足设定调制编码速率的波束成形数据的发射功率；若所述发射功率为本发送站点支持的发射功率，且检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，所述门限A1和门限A2根据传输带宽设置。
可选地，所述计算满足设定调制编码速率的波束成形数据的发射功率，包括：
从接收站点获取指示信息，所述指示信息包括：接收方发送无线帧的发送功率等级、接收方无线帧的接收功率；
满足设定调制编码速率的波束成形数据的发射功率为P_TX2＝RX_MCS+P_TX1-P_RX+DELTA；其中，
P_TX2为发射功率；
RX_MCS是指定调制编码速率集(MCS)对应的灵敏度；
P_TX1是接收方发送无线帧的发送功率等级；
P_RX是接收方无线帧的接收功率；
DELTA是修正因子，包括天线增益、天线损耗；
上述门限A1和门限A2除可根据传输带宽进行动态调节外，还可根据信道上的站点数进行调节，空闲信道确定模块202，还设置成：当检测到以波束成形传输数据所需的信道上站点数增多时，降低门限A1和门限A2；当检测到以波束成形传输数据所需的信道上站点数减少时，提高门限A1和门限A2；通过动态调节门限A1和门限A2，可实现在信道传输条件好的情况下，增加发送数据的概率，在信道传输条件变差的情况下，减少发送数据的概率；
上述系统还包括数据传输模块，设置成：在处于空闲状态的信道确定后，在空闲信道上按照信道竞争接入机制(如CSMA/CA机制)竞争发送机会，并在竞争到发送机会后传输数据。
可选地，在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据，包括：
若处于空闲状态的信道有多条，在每条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后在相应的信道上传输数据；
或，
若处于空闲状态的信道有多条，在其中一条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后，在每条空闲信道上传输数据。相对于方式一，在除竞争到发送机会的信道以外的信道上传输数据发生碰撞的可能性较大，但由于其减少了在多个信道上竞争发送机会的操作，减小了复杂度。
本发明实施例还公开了一种计算机程序，包括程序指令，当该程序指令被计算机执行时，使得该计算机可执行上述任意的空闲信道检测方法。
本发明实施例还公开了一种载有所述的计算机程序的载体。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读 存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现，相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本发明不限制于任何特定形式的硬件和软件的结合。
需要说明的是，本发明还可有其他多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性
上述技术方案，当站点以波束成形技术传输数据时，对以波束成形传输数据所需的信道进行信道测量确定信道空闲状态，可以有效控制各个信道上的数据传输，即有效避免了数据碰撞又提高了数据发送效率。因此本发明具有很强的工业实用性。

Claims (18)

  1. 一种空闲信道检测方法，应用于无线通信系统中，所述方法包括：
    对以波束成形传输数据所需的信道进行信道测量，确定处于空闲状态的信道。
  2. 如权利要求1所述的空闲信道检测方法，其中，
    所述以波束成形传输数据所需的信道为发送站点到接收站点间的、位于设定发送角度或设定接收角度、且在设定频率范围内的传输通道。
  3. 如权利要求1所述的空闲信道检测方法，其中，所述对以波束成形传输数据所需的信道进行信道测量的步骤包括：
    在所述信道上进行无线信号侦听和无线信号接收强度测量，其中，所述无线信号强度为预设时间段内信号强度的平均值。
  4. 如权利要求3所述的空闲信道检测方法，其中，所述对以波束成形传输数据所需的信道进行信道测量，确定处于空闲状态的信道的步骤包括：
    当以固定功率发射波束成形数据时，若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，并且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，其中，所述门限A1和门限A2根据传输带宽设置。
  5. 如权利要求3所述的空闲信道检测方法，其中，所述对以波束成形传输数据所需的信道进行信道测量，确定处于空闲状态的信道的步骤包括：
    当以可变功率发射波束成形数据时，计算满足设定调制编码速率的波束成形数据的发射功率；若所述发射功率为本发送站点支持的发射功率，且检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，其中，所述门限A1和门限A2根据传输带宽设置。
  6. 如权利要求4或5所述的空闲信道检测方法，该方法还包括：
    当检测到以波束成形传输数据所需的信道上站点数增多时，降低所述门限A1和门限A2；
    当检测到以波束成形传输数据所需的信道上站点数减少时，提高所述门限A1和门限A2。
  7. 如权利要求5所述的空闲信道检测方法，其中，所述计算满足设定调制编码速率的波束成形数据的发射功率的步骤包括：
    从接收站点获取指示信息，其中，所述指示信息包括：接收方发送无线帧的发送功率等级和接收方无线帧的接收功率；
    满足设定调制编码速率的波束成形数据的发射功率P_TX2为P_TX2＝RX_MCS+P_TX1-P_RX+DELTA；其中，P_TX2为发射功率，RX_MCS是指定调制编码速率集(MCS)对应的灵敏度，P_TX1是接收方发送无线帧的发送功率等级，P_RX是接收方无线帧的接收功率，DELTA是修正因子，包括天线增益和天线损耗。
  8. 如权利要求1所述的空闲信道检测方法，所述方法还包括：
    确定处于空闲状态的信道后，在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据。
  9. 如权利要求8所述的空闲信道检测方法，其中，所述在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据的步骤包括：
    若处于空闲状态的信道有多条，在每条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后在相应的信道上传输数据；
    若处于空闲状态的信道有多条，在其中一条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后，在每条空闲信道上传输数据。
  10. 一种空闲信道检测系统，应用于无线通信系统中，所述系统包括：信道测量模块和空闲信道确定模块，其中：
    所述信道测量模块设置成：对以波束成形传输数据所需的信道进行信道测量；
    所述空闲信道确定模块设置成：根据信道测量结果确定处于空闲状态的信道。
  11. 如权利要求10所述的空闲信道检测系统，其中，
    所述以波束成形传输数据所需的信道为发送站点到接收站点间的、位于设定发送/接收角度、在设定频率范围内的传输通道。
  12. 如权利要求10所述的空闲信道检测系统，其中，所述信道测量模块设置成按照如下方式对以波束成形传输数据所需的信道进行信道测量：
    在信道上进行无线信号侦听和无线信号接收强度测量；所述无线信号强度为预设时间段内信号强度的平均值。
  13. 如权利要求12所述的空闲信道检测系统，其中，所述空闲信道确定模块设置成按照如下方式根据信道测量结果确定处于空闲状态的信道：
    当以固定功率发射波束成形数据时，若检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，并且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，所述门限A1和门限A2根据传输带宽设置。
  14. 如权利要求12所述的空闲信道检测系统，其中，所述空闲信道确定模块设置成按照如下方式根据信道测量结果确定处于空闲状态的信道：
    当以可变功率发射波束成形数据时，计算满足设定调制编码速率的波束成形数据的发射功率；若所述发射功率为本发送站点支持的发射功率，且检测到与待发送数据的发射方向相反的信号强度小于或等于门限A1，且检测到与待发送数据的发射方向相同的信号强度小于或等于门限A2，则确定该信道处于空闲状态，所述门限A1和门限A2根据传输带宽设置。
  15. 如权利要求13或14所述的空闲信道检测系统，其中，所述空闲信道确定模块还设置成：
    当检测到以波束成形传输数据所需的信道上站点数增多时，降低所述门限A1和门限A2；
    当检测到以波束成形传输数据所需的信道上站点数减少时，提高所述门限A1和门限A2。
  16. 如权利要求14所述的空闲信道检测系统，其中，所述空闲信道确定模块设置成按照如下方式计算满足设定调制编码速率的波束成形数据的发射功率：
    从接收站点获取指示信息，其中，所述指示信息包括：接收方发送无线帧的发送功率等级和接收方无线帧的接收功率；
    满足设定调制编码速率的波束成形数据的发射功率为P_TX2＝RX_MCS+P_TX1-P_RX+DELTA；其中，P_TX2为发射功率，RX_MCS是指定调制编码速率集(MCS)对应的灵敏度，P_TX1是接收方发送无线帧的发送功率等级，P_RX是接收方无线帧的接收功率，DELTA是修正因子，包括天线增益和天线损耗。
  17. 如权利要求10所述的空闲信道检测系统，该系统还包括数据传输模块，其中
    所述数据传输模块设置成：在处于空闲状态的信道确定后，在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据。
  18. 如权利要求17所述的空闲信道检测系统，其中，所述数据传输模块设置成按照如下方式在空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后传输数据：
    若处于空闲状态的信道有多条，在每条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后在相应的信道上传输数据；
    若处于空闲状态的信道有多条，在其中一条空闲信道上按照信道竞争接入机制竞争发送机会，并在竞争到发送机会后，在每条空闲信道上传输数据。
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EP3206313A1 (en) 2017-08-16
EP3206313A4 (en) 2017-09-13
EP4099588A1 (en) 2022-12-07
CN105577291A (zh) 2016-05-11
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