WO2019062434A1 - 一种无线通信方法及相关设备 - Google Patents

一种无线通信方法及相关设备 Download PDF

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Publication number
WO2019062434A1
WO2019062434A1 PCT/CN2018/102825 CN2018102825W WO2019062434A1 WO 2019062434 A1 WO2019062434 A1 WO 2019062434A1 CN 2018102825 W CN2018102825 W CN 2018102825W WO 2019062434 A1 WO2019062434 A1 WO 2019062434A1
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WIPO (PCT)
Prior art keywords
silent
wireless terminals
target wireless
access point
wireless
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PCT/CN2018/102825
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English (en)
French (fr)
Inventor
孙福清
王云贵
何志健
王瑞丰
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华为技术有限公司
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Publication of WO2019062434A1 publication Critical patent/WO2019062434A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance

Definitions

  • the present application relates to the field of wireless communications, and in particular, to a wireless communication method and related devices.
  • FIG. 1 there is shown a schematic diagram of a wireless local area network (WLAN) system suitable for use in highways.
  • a wireless access point (AP) deployed on a highway roadway communicates with a WLAN terminal (such as a mobile phone, a tablet computer, an in-vehicle terminal, etc.) in the vehicle.
  • the terminal transmits and receives data via the wireless access point to access the Internet.
  • the wireless access point can only receive wireless signals sent by one terminal at a time.
  • the terminal to which the signal is to be transmitted delays the transmission of the wireless signal. Due to the high speed movement of vehicles on the highway, the vehicles usually maintain a large distance to ensure safety. Therefore the distance between the terminals is far. Far-distance terminals cannot detect each other whether the other party is sending a wireless signal. It is impossible to detect each other's terminals as hidden nodes. A terminal that is a hidden node may simultaneously transmit a wireless signal. Interference between wireless signals makes it difficult for the wireless access point to decode the wireless signal, resulting in loss of packets sent by the terminal.
  • the present application provides a wireless communication method and related device, which reduces packet loss of a wireless access point.
  • the application provides a wireless communication method, where the method includes:
  • the wireless access point sends a plurality of silent parameters to the plurality of target wireless terminals, the plurality of target wireless terminals and the plurality of silent parameters are in one-to-one correspondence, and the plurality of target wireless terminals are associated with the wireless access point
  • Each of the plurality of silent parameters includes a silent period and a silent interval, and the duration of the silent period in any one of the silent parameters is the sum of the duration of the silent interval and the duration of the non-silent period, the silent interval
  • the time period in which the corresponding target wireless terminal is not allowed to send a message, the non-quiet time period refers to a time period in which the corresponding target wireless terminal is allowed to send a message, and any two of the plurality of target wireless terminals are wireless.
  • the non-silent periods of the terminal do not overlap.
  • a silent mechanism is used to sequentially transmit signals to a plurality of target wireless terminals to a wireless access point.
  • Any target wireless terminal is allowed to transmit wireless signals only during non-silent periods. Since the non-quiet time periods of any two of the plurality of target wireless terminals do not overlap, no other target wireless terminal can transmit the wireless signal when any one of the target wireless terminals transmits the wireless signal. Therefore, the wireless access point only receives wireless signals from a target wireless terminal during each non-silent period, thereby reducing the occurrence of packet loss.
  • the duration of the non-quiet period of each of the plurality of target wireless terminals is based on a historical traffic of the corresponding target wireless terminal.
  • the multiple target wireless terminals are wireless terminals that meet at least one preset condition among all wireless terminals associated with the wireless access point,
  • the at least one preset condition includes a first preset condition, and the first preset condition includes:
  • the signal strength of the plurality of target wireless terminals is higher than or equal to the first preset signal strength
  • the signal strengths of the plurality of target wireless terminals are respectively higher than or equal to a difference between respective historical maximum signal strengths and second preset signal strengths; or
  • the plurality of target wireless terminals are the first predetermined number of wireless terminals in which the signal strengths of all the wireless terminals associated with the wireless access point are ranked.
  • the wireless terminal with high signal strength can be used as the target wireless terminal in all the wireless terminals associated with the wireless access point, the signal transmitted by the wireless terminal with high signal strength can be prevented from being discarded, thereby achieving the purpose of reducing the packet loss rate as a whole. At the same time, reduce the amount of calculation of the silence parameter.
  • the at least one preset condition further includes a second preset condition, where the second preset condition includes :
  • the historical traffic of the plurality of target wireless terminals is greater than or equal to the preset traffic; or
  • the plurality of target wireless terminals are the second preset number of wireless terminals in which all the wireless terminals satisfying the first preset condition are ranked first.
  • the target wireless terminal considering the signal strength, further consider the historical traffic, and the purpose is to ensure the communication requirement between the wireless terminal and the wireless access point as much as possible on the basis of reducing the packet loss rate, and Further reduce the amount of calculation of the silence parameter.
  • the historical traffic includes one or more of the following:
  • Historical air interface occupation time historical data volume and number of historical messages.
  • the at least A preset condition further includes a third preset condition, the third preset condition comprising:
  • the distance between the plurality of target wireless terminals and the wireless access point is less than or equal to a preset distance.
  • the distance is further considered when selecting the target wireless terminal, and the purpose is to further reduce the calculation amount of the silence parameter on the basis of reducing the packet loss rate.
  • the application further provides a wireless access point, where the wireless access point includes:
  • each of the plurality of silent parameters includes a silent period and a silent interval
  • the duration of the silent period in any one of the silent parameters is a sum of a duration of the silent interval and a duration of a non-silent period
  • the silence The interval refers to a time period in which the corresponding target wireless terminal is not allowed to send a message
  • the non-quiet time period refers to a time period in which the corresponding target wireless terminal is allowed to send a message
  • any two of the plurality of target wireless terminals The non-quiet time periods of the wireless terminals do not overlap.
  • a silent mechanism is used to sequentially transmit signals to a plurality of target wireless terminals to a wireless access point.
  • Any target wireless terminal is allowed to transmit wireless signals only during non-silent periods. Since the non-quiet time periods of any two of the plurality of target wireless terminals do not overlap, no other target wireless terminal can transmit the wireless signal when any one of the target wireless terminals transmits the wireless signal. Therefore, the wireless access point only receives wireless signals from a target wireless terminal during each non-silent period, thereby reducing the occurrence of packet loss.
  • the present application further provides a wireless communication system, where the system includes a wireless access point and a plurality of target wireless terminals, and the wireless access point is associated with the plurality of target wireless terminals;
  • the wireless access point is configured to send, by the plurality of target wireless terminals, a plurality of silent parameters, the plurality of target wireless terminals and the plurality of silent parameters are in one-to-one correspondence, the plurality of target wireless terminals and the plurality of target wireless terminals
  • Each of the plurality of silent parameters includes a silent period and a silent interval.
  • the duration of the silent period in any one of the silent parameters is the sum of the duration of the silent interval and the duration of the non-silent period.
  • the silent interval refers to a time period in which the corresponding target wireless terminal is not allowed to send a message
  • the non-quiet time period refers to a time period in which the corresponding target wireless terminal is allowed to send a message, in the multiple target wireless terminals.
  • the non-quiet time periods of any two target wireless terminals do not overlap;
  • the plurality of target wireless terminals are configured to send wireless signals to the wireless access point only in respective non-quiet time periods according to the respective silence parameters.
  • a silent mechanism is used to sequentially transmit signals to a plurality of target wireless terminals to a wireless access point.
  • Any target wireless terminal is allowed to transmit wireless signals only during non-silent periods. Since the non-quiet time periods of any two of the plurality of target wireless terminals do not overlap, no other target wireless terminal can transmit the wireless signal when any one of the target wireless terminals transmits the wireless signal. Therefore, the wireless access point only receives wireless signals from a target wireless terminal during each non-silent period, thereby reducing the occurrence of packet loss.
  • the present application further provides a wireless access point, where the wireless access point includes a processor and a wireless interface, where the processor is configured to send multiple silences to multiple target wireless terminals by using the wireless interface.
  • a parameter the plurality of target wireless terminals are in one-to-one correspondence with the plurality of silent parameters, the plurality of target wireless terminals are associated with the wireless access point, and each of the plurality of silent parameters includes a silent period
  • the duration of the silent period in any one of the silent parameters is the sum of the duration of the quiet interval and the duration of the non-silent period, where the silent interval refers to the time when the corresponding target wireless terminal is not allowed to send the message.
  • the non-silent period refers to a period of time during which the corresponding target wireless terminal is allowed to send a message, and the non-silence periods of any two of the plurality of target wireless terminals do not overlap.
  • a silent mechanism is used to sequentially transmit signals to a plurality of target wireless terminals to a wireless access point.
  • Any target wireless terminal is allowed to transmit wireless signals only during non-silent periods. Since the non-quiet time periods of any two of the plurality of target wireless terminals do not overlap, no other target wireless terminal can transmit the wireless signal when any one of the target wireless terminals transmits the wireless signal. Therefore, the wireless access point only receives wireless signals from a target wireless terminal during each non-silent period, thereby reducing the occurrence of packet loss.
  • the present application also provides a computer program product that, when executed, causes a wireless access point to perform the following operations:
  • the plurality of target wireless terminals and the plurality of silent parameters are in one-to-one correspondence, the plurality of target wireless terminals being associated with the wireless access point, the plurality of Each of the silent parameters includes a silent period and a silent interval.
  • the duration of the silent period in any one of the silent parameters is the sum of the duration of the silent interval and the duration of the non-silent period, and the silent interval is not allowed.
  • time periods do not overlap.
  • a silent mechanism is used to sequentially transmit signals to a plurality of target wireless terminals to a wireless access point.
  • Any target wireless terminal is allowed to transmit wireless signals only during non-silent periods. Since the non-quiet time periods of any two of the plurality of target wireless terminals do not overlap, no other target wireless terminal can transmit the wireless signal when any one of the target wireless terminals transmits the wireless signal. Therefore, the wireless access point only receives wireless signals from a target wireless terminal during each non-silent period, thereby reducing the occurrence of packet loss.
  • WLAN wireless local area network
  • FIG. 2 is a hardware architecture diagram of a wireless communication system according to an embodiment of the present application.
  • FIG. 3 is a flowchart of a method for wireless communication according to an embodiment of the present application.
  • FIG. 4 is a structural block diagram of a wireless access point according to an embodiment of the present application.
  • the present application provides a wireless communication method and related device, which is based on the use of a silent mechanism for carrier-sense multiple access with collision avoidance (CSMA/CA) access mechanism.
  • CSMA/CA carrier-sense multiple access with collision avoidance
  • the silent mechanism defines a quiet interval (in English: quiet interval). This time interval can be used to implement channel measurements without signal interference from the wireless terminal.
  • the hardware architecture of the wireless communication system provided by the present application is described below by taking an application scenario as an example.
  • a wireless communication system includes a wireless access point 100 and a plurality of wireless terminals 200.
  • the wireless terminal 200 includes a mobile phone, a computer, a wearable device, an in-vehicle terminal, or any other type of terminal device that supports WLAN.
  • a plurality of wireless terminals 200 are associated with the wireless access point 100.
  • FIG. 3 it is a flowchart of a method for wireless communication provided by an embodiment of the present application.
  • the wireless access point sends multiple silence parameters to multiple target wireless terminals.
  • S102 The plurality of target wireless terminals send wireless signals to the wireless access point according to respective silent parameters.
  • the target wireless terminal is all wireless terminals associated with the wireless access point, or some of the wireless terminals associated with the wireless access point. For example, a wireless terminal having a higher signal strength may be selected as a target wireless terminal among all wireless terminals associated with the wireless access point.
  • a plurality of target wireless terminals are associated with the wireless access point.
  • the wireless access point may indicate the silence parameters of each wireless terminal with a quiet element (Quiet element), a Quiet Channel element (English: Quiet Channel element), or other similar elements in the WLAN.
  • the plurality of target wireless terminals and the plurality of silent parameters are in one-to-one correspondence.
  • a silent element or a silent channel element includes a Quiet Period field and a plurality of fields indicating a quiet interval.
  • a plurality of fields indicating a quiet interval include a Quiet Duration field, a Quiet Count field, and a Quiet Offset field. The value of the silence offset field can be defaulted to 0.
  • the Quiet Period field is set to the number of beacon intervals between the start of the regularly scheduled quiet interval (English: beacon interval). In the embodiment of the present invention, the silent period field is not 0.
  • the duration of the silent period in any of the silent parameters is the sum of the duration of the silent interval and the duration of the non-silent period.
  • the quiet interval is a period of time during which the target wireless terminal is prohibited from transmitting a signal.
  • the non-silent period refers to the period of time during which the target wireless terminal is allowed to transmit a signal.
  • the target wireless terminal refers to a wireless terminal that receives a silent parameter, and different silent parameters correspond to different target wireless terminals.
  • a unicast management frame may be used, such as a unicast beacon frame or an action frame carrying a silent parameter.
  • the receiver address (English: receiver address, RA) of the management frame carrying the silent parameter is the address of the corresponding target wireless terminal.
  • the duration of the silence duration field is set to the duration of the silence interval, expressed in units of time (English: time unit, TU).
  • One time unit is 1024 microseconds, which is about 1 millisecond.
  • the Quiet Times field is set to the number of target beacon transmission times (TBTT) between beacon intervals starting at the quiet interval.
  • TBTT target beacon transmission times
  • the Silent Offset field is set to the offset from the TBTT specified by the Quiets field to the silence interval, expressed in TU.
  • the value of the Quiet Offset field is below a beacon interval.
  • the wireless AP can set multiple silence intervals for one target wireless terminal with multiple silence elements in one management frame.
  • the time period outside the quiet interval is a non-quiet time period.
  • the wireless AP may obtain one or more corresponding silent elements according to the non-silent time period.
  • the beacon interval is 100 milliseconds
  • the unicast management frame including the following two silent elements may be sent to the target wireless terminal: the silent period field of the first silent element is 10, the silence duration field 400, the silence number field is 1, and the silence offset field is 0.
  • the second silent element has a silent period field of 10, a silent duration field of 300, a silent number field of 8, and a silent offset field of zero.
  • a target wireless terminal can be set to transmit signals from 250 milliseconds to 430 milliseconds and 660 milliseconds to 820 milliseconds from the first TBTT after receiving the management frame carrying the silent element, and Repeating in a 1000 millisecond period, a unicast management frame including the following three silent elements may be sent to the target wireless terminal: a silence period field of the first silence element is 10, a silence duration field 250, and a silence number field of 1, The silence offset field is 0.
  • the second silent element has a silent period field of 10, a silent duration field of 230, a silent number field of 5, and a silent offset field of zero.
  • the third silent element has a silent period field of 10, a silent duration field of 180, a silent number field of 9, and a silent offset field of zero.
  • the wireless AP allocates a respective non-quiet time period to the plurality of target wireless terminals, and ensures that the non-quiet time periods do not overlap each other.
  • These target wireless terminals may be all wireless terminals associated with the wireless AP or may be some of the wireless terminals associated with the wireless AP.
  • the wireless AP transmits, to the target wireless terminal, a unicast management frame carrying a silent element corresponding to the non-quiet time period according to the non-quiet time period allocated for each target wireless terminal.
  • the beacon interval is 100 milliseconds
  • the quiet period is 10 beacon intervals, ie 1000 milliseconds.
  • the wireless AP allocates non-quiet time periods for 10 target wireless terminals, in order of 0-100, 100-200 milliseconds, ..., 900-1000 milliseconds. Then, the wireless AP sequentially transmits the management frame 1 to the management frame 10 to the target wireless terminals.
  • management frame 1 carries a silent element.
  • the silent element has a silent period field of 10, a silent duration field of 900, a silent number field of 2, and a silent offset field of zero.
  • Management frame 2 carries two silent elements.
  • the first silent element has a silent period field of 10, a silent duration field of 100, a silent number field of 1, and a silent offset field of zero.
  • the second silent element has a silent period field of 10, a silent duration field of 800, a silent number field of 3, and a silent offset field of zero.
  • Management frame 3 carries two silent elements.
  • the first silent element has a silent period field of 10, a silent duration field of 200, a silent number field of 1, and a silent offset field of zero.
  • the second silent element has a silent period field of 10, a silent duration field of 700, a silent number field of 4, and a silent offset field of zero.
  • management frame 10 carries a silent element.
  • the silent element has a silent period field of 10, a silent duration field of 900, a silent number field of 1, and a silent offset field of zero.
  • the multiple silences may be sent multiple times through multiple management frames.
  • the above management frame 2 may be changed into management frames 2' and 2", wherein the management frame 2' carries a silent element, the silent period field of the silent element is 2, the silence duration field 100, the silence number field is 1, and the silence offset is The field is 0.
  • the management frame 2" carries another silent element, the quiet period field of the silent element is 9, the silence duration field 800, the silence number field is 2, and the silence offset field is 0.
  • a silent mechanism is used to sequentially transmit signals to a plurality of target wireless terminals to the wireless access point.
  • Any target wireless terminal is allowed to transmit wireless signals only during non-silent periods. Since the non-quiet time periods of any two of the plurality of target wireless terminals do not overlap, no other target wireless terminal can transmit the wireless signal when any one of the target wireless terminals transmits the wireless signal. Therefore, the wireless access point only receives wireless signals from a target wireless terminal during each non-silent period, thereby reducing the occurrence of packet loss.
  • the silence duration of the target wireless terminal may be determined according to respective historical traffic of the plurality of target wireless terminals.
  • the historical traffic of a target wireless terminal refers to the traffic received by the wireless access point from the message sent by the target wireless terminal and/or the traffic sent to the target wireless terminal.
  • the silent period is constant, the higher the historical traffic, the shorter the quiet duration and the longer the non-silent time period.
  • the duration of the silence can be weighted according to the historical quiet interval, and the weight is determined according to the historical traffic.
  • the historical silence duration refers to the silence duration included in the silence parameter that the wireless access point once sent to the target wireless terminal.
  • the historical silence duration may be the duration of silence that the wireless access point last sent to the target wireless terminal.
  • the historical silence duration may also be the average of the silence durations sent by the wireless access point to the target wireless terminal several times.
  • the historical traffic includes one of the following: historical air interface occupation time, historical data volume, and historical message quantity.
  • the historical air interface occupation time of a target wireless terminal refers to a time taken by the wireless access point to receive the message sent by the target wireless terminal, and/or the wireless access point once sends a message to the target wireless terminal. Occupied time.
  • the historical air interface occupation time may be the time taken by the wireless access point to receive the message sent by the target wireless terminal, and/or the time taken to send the message to the target wireless terminal last time.
  • the historical air interface time may also be the average value of the time taken by the wireless access point to receive the message of the target wireless terminal and/or the time of sending the message.
  • the historical data volume of a target wireless terminal refers to the amount of data that the wireless access point has received the message sent by the target wireless terminal, and/or the amount of data that the wireless access point has sent to the target wireless terminal.
  • the historical data volume may be the data amount of the last time the wireless access point receives the message sent by the target wireless terminal, and/or the data amount of the last time the wireless access point sends the message to the target wireless terminal.
  • the amount of historical data may also be the average of the amount of data received by the wireless access point in the most recent number of times the message transmitted by the target wireless terminal and/or the amount of data sent to the target wireless terminal.
  • the number of historical messages of a target wireless terminal refers to the number of messages that the wireless access point has received by the target wireless terminal, and/or the number of messages that the wireless access point has sent to the target wireless terminal.
  • the number of historical messages may be the number of times the wireless access point receives the last time sent by the target wireless terminal, and/or the number of messages sent by the wireless access point to the target wireless terminal.
  • the historical data volume may also be the average of the number of messages sent by the target wireless terminal and/or the number of messages sent to the target wireless terminal within the most preset time period of the wireless access point.
  • a wireless terminal that satisfies at least one preset condition may be selected from all wireless terminals associated with the wireless access point as the target wireless terminal.
  • a wireless terminal having a high signal strength is selected as a target wireless terminal from wireless terminals associated with the wireless access point. This is because if the wireless access point simultaneously receives messages from two different wireless terminals, if the signal strengths of the two wireless terminals are the same or relatively close, then the wireless access point will The packets are discarded. If the signal strength of the two wireless terminals is large, the wireless access point discards the packets sent by the wireless terminal with poor signal strength.
  • the wireless terminal with high signal strength is used as the target wireless terminal, it can first ensure that the wireless terminal with high signal strength does not preempt the air interface time, that is, the message transmitted by the wireless terminal with high signal strength can be received, Packets will be discarded. Secondly, even if the wireless terminal with high signal strength sends a message to the wireless access point, and the wireless terminal with low signal strength sends a message to the wireless access point, the message sent by the wireless terminal with low signal strength will It is discarded, so that the signal transmitted by the wireless terminal with high signal strength can be discarded. In general, by abandoning the wireless terminal with low signal strength, it is ensured that the signal transmitted by the wireless terminal with high signal strength can be received, thereby achieving the goal of reducing the packet loss rate as a whole.
  • the signal strength of the target wireless terminal needs to meet the first preset condition.
  • the first preset condition may be that the signal strengths of the multiple target wireless terminals are higher than or equal to the first preset signal strength, or the signal strengths of the multiple target wireless terminals are respectively higher than or equal to the respective historical maximum signal strengths.
  • the difference between the second preset signal strengths For the latter, the signal strength thresholds of different target wireless terminals are different. This method can take into account the actual association of the wireless terminal and is more practical.
  • the first preset condition may also be that the plurality of target wireless terminals are the first preset number of wireless terminals whose signal strengths are ranked in the wireless terminal associated with the wireless access point.
  • the signal strength can be obtained by the wireless access point receiving the packet receiving rate of the packet from the wireless terminal.
  • a wireless terminal with a higher historical traffic and/or a closer distance is selected as the target wireless terminal. That is to say, from all the wireless terminals associated with the wireless access point, a wireless terminal with high signal strength and high historical traffic, and/or high signal strength and close proximity is selected as the target wireless terminal.
  • Historical traffic represents the interaction requirement between the wireless terminal and the wireless access point
  • the historical traffic is considered in addition to reducing the amount of calculation of the silent parameter, and also to ensure the communication requirement between the wireless terminal and the wireless access point as much as possible.
  • Historical traffic can be determined by the rate and time that the wireless terminal once sent a signal to the wireless access point each time.
  • the historical traffic of the target wireless terminal meets the second preset condition on the premise that the signal strength of the target wireless terminal meets the first preset condition.
  • the second preset condition may be that the historical traffic of the plurality of target wireless terminals is greater than or equal to the preset traffic.
  • the second preset condition may be that the plurality of target wireless terminals are the second predetermined number of wireless terminals that are ranked in the first of the plurality of wireless terminals that satisfy the first preset condition.
  • the distance between the wireless terminal and the wireless access point may be calculated by the time at which the wireless access point transmits a signal to the wireless terminal to the time at which the wireless access point receives the response signal from the wireless terminal feedback, and the signal rate.
  • the distance between the target wireless terminal and the wireless access point satisfies a third preset condition on the premise that the signal strength of the target wireless terminal meets the first preset condition.
  • the third preset condition may be that the distance between the plurality of target wireless terminals and the wireless access point is less than or equal to a preset distance.
  • the third preset condition may be that the target wireless terminal is the third preset number of wireless terminals among all the wireless terminals that satisfy the first preset condition or the second preset condition.
  • the embodiment of the present application further provides a wireless access point, including:
  • each of the plurality of silent parameters includes a silent period and a silent interval
  • the duration of the silent period in any one of the silent parameters is a sum of a duration of the silent interval and a duration of a non-silent period
  • the silence The interval refers to a time period in which the corresponding target wireless terminal is not allowed to send a message
  • the non-quiet time period refers to a time period in which the corresponding target wireless terminal is allowed to send a message
  • any two of the plurality of target wireless terminals The non-quiet time periods of the wireless terminals do not overlap.
  • the duration of the non-silence period of each of the plurality of target wireless terminals is based on a historical traffic of the corresponding target wireless terminal.
  • the multiple target wireless terminals are wireless terminals that meet at least one preset condition among all wireless terminals associated with the wireless access point, and the at least one preset condition includes a first preset condition, where
  • the first preset conditions include:
  • the signal strength of the plurality of target wireless terminals is higher than or equal to the first preset signal strength
  • the signal strengths of the plurality of target wireless terminals are respectively higher than or equal to a difference between respective historical maximum signal strengths and second preset signal strengths; or
  • the plurality of target wireless terminals are the first predetermined number of wireless terminals in which the signal strengths of all the wireless terminals associated with the wireless access point are ranked.
  • the at least one preset condition further includes a second preset condition, where the second preset condition includes:
  • the historical traffic of the plurality of target wireless terminals is greater than or equal to the preset traffic; or
  • the plurality of target wireless terminals are the second preset number of wireless terminals in which all the wireless terminals satisfying the first preset condition are ranked first.
  • the historical traffic includes one or more of the following:
  • Historical air interface occupation time historical data volume and number of historical messages.
  • the at least one preset condition further includes a third preset condition, where the third preset condition includes:
  • the distance between the plurality of target wireless terminals and the wireless access point is less than or equal to a preset distance.
  • the embodiment of the present application further provides a wireless communication system, where the system includes a wireless access point and multiple target wireless terminals, and the wireless access point is associated with the multiple target wireless terminals;
  • the wireless access point is configured to send, by the plurality of target wireless terminals, a plurality of silent parameters, the plurality of target wireless terminals and the plurality of silent parameters are in one-to-one correspondence, the plurality of target wireless terminals and the plurality of target wireless terminals
  • Each of the plurality of silent parameters includes a silent period and a silent interval.
  • the duration of the silent period in any one of the silent parameters is the sum of the duration of the silent interval and the duration of the non-silent period.
  • the silent interval refers to a time period in which the corresponding target wireless terminal is not allowed to send a message
  • the non-quiet time period refers to a time period in which the corresponding target wireless terminal is allowed to send a message, in the multiple target wireless terminals.
  • the non-quiet time periods of any two target wireless terminals do not overlap;
  • the plurality of target wireless terminals are configured to send wireless signals to the wireless access point according to the respective silence parameters.
  • This embodiment reduces the occurrence of packet loss on the wireless access point.
  • the embodiment of the present application further provides a wireless access point.
  • FIG. 4 the figure is a structural block diagram of a wireless access point provided by this embodiment.
  • the wireless access point 20 includes components such as a wireless interface 201, a wired interface 202, a memory 203, a processor 204, and the like. It will be understood by those skilled in the art that the structure of the wireless access point 20 shown in FIG. 4 does not constitute a limitation of a wireless access point, and may include more or less components than those illustrated, or may combine certain components. Or different parts arrangement.
  • the wireless interface 201 can be used for wireless communication with wireless terminals, typically including an antenna and a wireless network card.
  • the wired interface 202 can be used to communicate with a superior network device, typically including a wired network card.
  • a program is stored in the memory 203, and the processor 204 executes various functions of the wireless access point 20 and data processing by running a program stored in the memory 203.
  • the memory 203 is typically memory.
  • the processor 204 is the control center of the wireless access point 20, connecting various portions of the entire wireless access point 20 using various interfaces and lines, by running or executing software programs and/or modules stored in the memory 203, and invoking storage.
  • the data in the memory 203 performs various functions and processing data of the wireless access point 20, thereby performing overall monitoring of the wireless access point 20.
  • the wireless access point 20 also includes a power source 205 that supplies power to various components, such as Power Over Ethernet (POE).
  • the power source 205 can be logically coupled to the processor 204 through a power management system to pass The power management system manages functions such as charging, discharging, and power management.
  • the processor 204 is configured to:
  • the wireless interface 201 Transmitting, by the wireless interface 201, a plurality of silent parameters to the plurality of target wireless terminals, the plurality of target wireless terminals and the plurality of silent parameters are in one-to-one correspondence, and the plurality of target wireless terminals are associated with the wireless access point
  • Each of the plurality of silent parameters includes a silent period and a silent interval, and the duration of the silent period in any one of the silent parameters is the sum of the duration of the silent interval and the duration of the non-silent period, the silent interval
  • the time period in which the corresponding target wireless terminal is not allowed to send a message, the non-quiet time period refers to a time period in which the corresponding target wireless terminal is allowed to send a message, and any two of the plurality of target wireless terminals are wireless.
  • the non-silent periods of the terminal do not overlap.
  • This embodiment reduces the occurrence of packet loss on the wireless access point.
  • the above embodiments it may be implemented in whole or in part by software, hardware, or a combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, twisted pair, fiber optic) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be stored by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, an optical medium such as an optical disk, or a semiconductor medium such as a solid state disk (SSD).
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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Abstract

公开了一种无线通信方法及相关设备，减少了无线接入点的丢包现象。其中所述方法包括：无线接入点向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。

Description

一种无线通信方法及相关设备
本申请要求于2017年9月27日提交中国专利局、申请号为201710891586.9、发明名称为“一种无线通信方法及相关设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信领域，尤其涉及一种无线通信方法及相关设备。
背景技术
参见图1，该图为适用于高速公路的无线局域网(WLAN)系统的示意图。在该图中，部署在高速公路路旁的无线接入点(英文：access point，AP)和车辆内的WLAN终端(例如手机、平板电脑、车载终端等)通信。终端经由无线接入点收发数据以访问互联网。
无线接入点每次只能接收一个终端发送的无线信号。在探测到另一终端发送无线信号时，待发送信号的终端会推迟无线信号的发送。由于高速公路上的车辆高速移动，车辆间通常保持大的距离以保证安全。因此终端之间的距离远。距离远的终端无法相互探测到对方是否正在发送无线信号。无法相互探测到对方的终端互为隐藏节点。互为隐藏节点的终端可能同时发送无线信号。无线信号间的干扰使得无线接入点难以对无线信号解码，从而导致终端发送的包丢失。
发明内容
为了解决上述技术问题，本申请提供了一种无线通信方法及相关设备，减少了无线接入点的丢包现象。
第一方面，本申请提供了一种无线通信方法，所述方法包括：
无线接入点向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
在本申请中，利用静默机制实现对多个目标无线终端有序向无线接入点发送信号。任意目标无线终端只有在非静默时间段才被允许发送无线信号。由于多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠，任意一个目标无线终端发送无线信号时没有任何其他目标无线终端能够发送无线信号。所以无线接入点在每个非静默时间段只会接收来自一个目标无线终端的无线信号，从而减少丢包现象的出现。
在第一方面的第一种可能实现的方式中，所述多个目标无线终端中各个目标无线终端的所述非静默时间段的时长基于对应的目标无线终端的历史流量。
在第一方面或第一方面的第一种可能实现的方式中，所述多个目标无线终端为与所 述无线接入点关联的所有无线终端中满足至少一个预设条件的无线终端，所述至少一个预设条件包括第一预设条件，所述第一预设条件包括：
所述多个目标无线终端的信号强度高于或等于第一预设信号强度；或，
所述多个目标无线终端的信号强度分别高于或等于各自的历史最大信号强度与第二预设信号强度之差；或，
所述多个目标无线终端为与所述无线接入点关联的所有无线终端中信号强度排在前第一预设数目的无线终端。
由于在所有与无线接入点关联的无线终端中信号强度高的无线终端才能作为目标无线终端，保证信号强度高的无线终端发送的信号能够不被丢弃，实现在整体上减少丢包率的目的，同时减少静默参数的计算量。
结合第一方面或第一方面的第一种可能实现的方式，在第二种可能实现的方式中，所述至少一个预设条件还包括第二预设条件，所述第二预设条件包括：
所述多个目标无线终端的历史流量大于或等于预设流量；或，
所述多个目标无线终端是满足所述第一预设条件的所有的无线终端中历史流量排在前第二预设数目个无线终端。
在选择目标无线终端时，在考虑信号强度的前提下，进一步考虑历史流量，其目的在于在减少丢包率的基础上，尽可能的保证无线终端与无线接入点之间的通信需求，以及进一步减少静默参数的计算量。
结合第一方面、第一方面的第一种可能实现的方式或第一方面的第二种可能实现的方式，在第三种可能实现的方式中，所述历史流量包括以下一个或多个：
历史空口占用时间，历史数据量和历史报文数量。
结合第一方面的第一种可能实现的方式、第一方面的第二种可能实现的方式或第一方面的第三种可能实现的方式，在第四种可能实现的方式中，所述至少一个预设条件还包括第三预设条件，所述第三预设条件包括：
所述多个目标无线终端与所述无线接入点的距离小于或等于预设距离。
在选择目标无线终端时进一步考虑距离，其目的在于在减少丢包率的基础上，进一步减少静默参数的计算量。
第二方面，本申请还提供了一种无线接入点，所述无线接入点包括：
发送单元，用于向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
在本申请中，利用静默机制实现对多个目标无线终端有序向无线接入点发送信号。任意目标无线终端只有在非静默时间段才被允许发送无线信号。由于多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠，任意一个目标无线终端发送无线信号时没有任何其他目标无线终端能够发送无线信号。所以无线接入点在每个非静默时间段只会接收来自一个目标无线终端的无线信号，从而减少丢包现象的出现。
第三方面，本申请还提供了一种无线通信系统，所述系统包括无线接入点和多个目标无线终端，所述无线接入点与所述多个目标无线终端关联；
所述无线接入点，用于向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠；
所述多个目标无线终端，用于按照各自的所述静默参数，仅在各自的非静默时间段向所述无线接入点发送无线信号。
在本申请中，利用静默机制实现对多个目标无线终端有序向无线接入点发送信号。任意目标无线终端只有在非静默时间段才被允许发送无线信号。由于多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠，任意一个目标无线终端发送无线信号时没有任何其他目标无线终端能够发送无线信号。所以无线接入点在每个非静默时间段只会接收来自一个目标无线终端的无线信号，从而减少丢包现象的出现。
第四方面，本申请还还提供了一种无线接入点，所述无线接入点包括处理器和无线接口，所述处理器用于用所述无线接口向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
在本申请中，利用静默机制实现对多个目标无线终端有序向无线接入点发送信号。任意目标无线终端只有在非静默时间段才被允许发送无线信号。由于多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠，任意一个目标无线终端发送无线信号时没有任何其他目标无线终端能够发送无线信号。所以无线接入点在每个非静默时间段只会接收来自一个目标无线终端的无线信号，从而减少丢包现象的出现。
第五方面，本申请还还提供了一种计算机程序产品，所述计算机程序在被执行时使得无线接入点执行以下操作：
向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
在本申请中，利用静默机制实现对多个目标无线终端有序向无线接入点发送信号。任意目标无线终端只有在非静默时间段才被允许发送无线信号。由于多个目标无线终端 中任意两个目标无线终端的非静默时间段不重叠，任意一个目标无线终端发送无线信号时没有任何其他目标无线终端能够发送无线信号。所以无线接入点在每个非静默时间段只会接收来自一个目标无线终端的无线信号，从而减少丢包现象的出现。
附图说明
图1为适用于高速公路的无线局域网(WLAN)系统的示意图；
图2为本申请实施例提供的无线通信系统的硬件架构图；
图3为本申请实施例提供的一种无线通信方法的流程图；
图4为本申请实施例提供的一种无线接入点的结构框图。
具体实施方式
本申请提供了一种无线通信方法及相关设备，其原理在于利用静默机制，对使用载波侦听多路访问/碰撞避免(英文：carrier-sense multiple access with collision avoidance，CSMA/CA)访问机制的多个目标无线终端向无线接入点发送报文的时间段进行控制。
静默机制定义了一个没有传输发生的静默间隔(英文：quiet interval)。这个时间间隔可以用来实现没有无线终端的信号干扰的信道测量。
下面以一个应用场景为例介绍本申请提供的无线通信系统的硬件架构图。
参见图2，在该图中，无线通信系统包括无线接入点100和多个无线终端200。无线终端200包括手机、电脑、可穿戴设备、车载终端或任何其他类型的支持WLAN的终端设备。
多个无线终端200与无线接入点100关联。
参见图3，该图为本申请实施例提供的一种无线通信方法的流程图。
本实施例提供的无线通信方法包括如下步骤：
S101：无线接入点向多个目标无线终端发送多个静默参数。
S102：多个目标无线终端按照各自的静默参数向所述无线接入点发送无线信号。
目标无线终端是与无线接入点关联的所有无线终端，或者是与无线接入点关联的所有无线终端中的一些无线终端。例如，可以在与无线接入点关联的所有无线终端中选出信号强度较高的无线终端作为目标无线终端。
多个目标无线终端与无线接入点关联。无线接入点可以用静默元素(英文：Quiet element)、静默信道元素(英文：Quiet Channel element)或WLAN中可能的其他类似元素指示各个无线终端的静默参数。所述多个目标无线终端和所述多个静默参数一一对应。
静默元素或静默信道元素包括静默周期(英文：Quiet Period)字段和指示静默间隔的多个字段。指示静默间隔的多个字段包括静默时长(英文：Quiet Duration)字段、静默次数(英文：Quiet Count)字段和静默偏移(英文：Quiet Offset)字段。其中静默偏移字段的值可以缺省，即为0。
静默周期字段被设置为定期调度的静默间隔的起始之间的信标间隔(英文：beacon interval)的数目。本发明实施例中静默周期字段不为0。
任意一个静默参数中静默周期的时长为静默间隔的时长和非静默时间段的时长之和。静默间隔是指禁止目标无线终端发送信号的时间段。非静默时间段是指允许目标无线终端发送信号的时间段。目标无线终端是指接收静默参数的无线终端，不同的静默参数对应不同的目标无线终端。
为了让不同的目标无线终端仅接收自己的静默参数，可以采用单播的管理帧，例如单播信标帧或动作帧携带静默参数。携带静默参数的管理帧的接收者地址(英文：receiver address，RA)为对应的目标无线终端的地址。
静默时长字段被设置为静默间隔的时长，以时间单位(英文：time unit，TU)表示。一个时间单位为1024微秒，即约为1毫秒。
静默次数字段被设置为到静默间隔开始的信标间隔之间目标信标发送时间(英文：target beacon transmission time，TBTT)的数目。静默次数字段的值为1指示静默间隔开始的信标间隔从下一TBTT开始。
静默偏移字段被设置为从静默次数字段指定的TBTT到静默间隔开始的偏移，以TU表示。静默偏移字段的值低于一个信标间隔。
无线AP可以用一个管理帧中的多个静默元素为一个目标无线终端设置多个静默间隔。静默间隔之外的时间段为非静默时间段。无线AP可以根据非静默时间段得到对应的一个或多个静默元素。
例如，如果信标间隔为100毫秒，要设置一个目标无线终端从接收到携带静默元素的管理帧后的第1个TBTT开始的400毫秒至700毫秒可以发送信号，并且以1000毫秒为周期重复，则可以向该目标无线终端发送包括以下两个静默元素的单播管理帧：第一个静默元素的静默周期字段为10，静默时长字段400，静默次数字段为1，静默偏移字段为0。第二个静默元素的静默周期字段为10，静默时长字段300，静默次数字段为8，静默偏移字段为0。
又例如，如果信标间隔为100毫秒，要设置一个目标无线终端从接收到携带静默元素的管理帧后的第1个TBTT开始的250毫秒至430毫秒以及660毫秒至820毫秒可以发送信号，并且以1000毫秒为周期重复，则可以向该目标无线终端发送包括以下三个静默元素的单播管理帧：第一个静默元素的静默周期字段为10，静默时长字段250，静默次数字段为1，静默偏移字段为0。第二个静默元素的静默周期字段为10，静默时长字段230，静默次数字段为5，静默偏移字段为0。第三个静默元素的静默周期字段为10，静默时长字段180，静默次数字段为9，静默偏移字段为0。
无线AP为多个目标无线终端分配各自的非静默时间段，并保证这些非静默时间段互不重叠。这些目标无线终端可以是和无线AP关联的全部无线终端，或者可以是和无线AP关联的无线终端中的一些无线终端。无线AP根据为每个目标无线终端分配的非静默时间段，向该目标无线终端发送与其非静默时间段对应的携带静默元素的单播管理帧。
例如，如果信标间隔为100毫秒，静默周期为10个信标间隔，即1000毫秒。无线AP为10个目标无线终端分配非静默时间段，依次为0-100，100-200毫秒，……，900-1000毫秒。则无线AP向这些目标无线终端依次发送管理帧1至管理帧10。其中，管理帧1携带一个静默元素。该静默元素的静默周期字段为10，静默时长字段900，静默次数字段为2，静默偏移字段为0。管理帧2携带两个静默元素。第一个静默元素的静默周期字段为10， 静默时长字段100，静默次数字段为1，静默偏移字段为0。第二个静默元素的静默周期字段为10，静默时长字段800，静默次数字段为3，静默偏移字段为0。管理帧3携带两个静默元素。第一个静默元素的静默周期字段为10，静默时长字段200，静默次数字段为1，静默偏移字段为0。第二个静默元素的静默周期字段为10，静默时长字段700，静默次数字段为4，静默偏移字段为0。依次类推，管理帧10携带一个静默元素。该静默元素的静默周期字段为10，静默时长字段900，静默次数字段为1，静默偏移字段为0。
在上述例子中，若管理帧携带有超过一个静默元素，除了采用上文所述的在一个管理帧中携带多个静默元素的方式，还可以通过多个管理帧分多次发送这多个静默元素。例如上述管理帧2可以变为管理帧2’和2”，其中管理帧2’携带一个静默元素，该静默元素的静默周期字段为2，静默时长字段100，静默次数字段为1，静默偏移字段为0。管理帧2”携带另一个静默元素，该静默元素的静默周期字段为9，静默时长字段800，静默次数字段为2，静默偏移字段为0。当向目标无线终端发送了管理帧2’并经过一个信标间隔后，向该目标无线终端发送管理帧2”。
在本实施例中，利用静默机制实现对多个目标无线终端有序向无线接入点发送信号。任意目标无线终端只有在非静默时间段才被允许发送无线信号。由于多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠，任意一个目标无线终端发送无线信号时没有任何其他目标无线终端能够发送无线信号。所以无线接入点在每个非静默时间段只会接收来自一个目标无线终端的无线信号，从而减少丢包现象的出现
此外，在本实施例中，目标无线终端的静默时长可以分别根据多个目标无线终端各自的历史流量进行确定。一个目标无线终端的历史流量是指无线接入点曾经接收的来自于该目标无线终端发送的报文的流量和/或向该目标无线终端发送的报文的流量。在静默周期一定的前提下，历史流量越高，静默时长越短，非静默时间段越长。
可选的，静默时长可以根据历史静默间隔加权得到，而权重根据历史流量进行确定。历史静默时长是指无线接入点曾经向目标无线终端发送的静默参数中包括的静默时长。例如，历史静默时长可以是无线接入点上一次向目标无线终端发送的静默时长。历史静默时长还可以是无线接入点最近若干次向目标无线终端发送的静默时长的均值。
可选的，历史流量包括以下少一个：历史空口占用时间、历史数据量和历史报文数量。
其中，一个目标无线终端的历史空口占用时间是指无线接入点曾经接收该目标无线终端发送的报文所占用的时间，和/或，无线接入点曾经向该目标无线终端发送报文所占用的时间。例如，历史空口占用时间可以是无线接入点上一次接收该目标无线终端发送的报文所占用的时间，和/或，上一次向该目标无线终端发送报文所占用的时间。历史空口时间还可以是无线接入点最近若干次接收该目标无线终端的报文和/或发送报文所占用的时间的均值。
一个目标无线终端的历史数据量是指无线接入点曾经接收该目标无线终端发送的报文的数据量，和/或，无线接入点曾经向该目标无线终端发送的报文的数据量。例如，历史数据量可以是无线接入点上一次接收该目标无线终端发送的报文的数据量，和/或，无线接入点上一次向该目标无线终端发送的报文的数据量。历史数据量还可以是无线接 入点最近若干次接收该目标无线终端发送的报文的数据量和/或向该目标无线终端发送的报文的数据量的均值。
一个目标无线终端的历史报文数量是指无线接入点曾经接收该目标无线终端发送的报文的数量，和/或，无线接入点曾经向该目标无线终端发送的报文的数量。例如，历史报文数量可以是无线接入点上一次接收该目标无线终端发送的报文的数量，和/或，无线接入点上一次向该目标无线终端发送的报文的数量。历史数据量还可以是无线接入点最近预设时间段内接收该目标无线终端发送的报文的数量和/或向该目标无线终端发送的报文的数量的均值。
另外，为了减少静默参数的计算量，可以从与无线接入点关联的所有无线终端中选出满足至少一个预设条件的无线终端作为目标无线终端。
首先，为了尽可能的减少丢包现象，在本实施例中，从与无线接入点关联的无线终端中选择信号强度高的无线终端作为目标无线终端。这是因为，若无线接入点同时接收来自于两个不同的无线终端发送的报文时，若这两个无线终端的信号强度相同或比较接近，那么无线接入点就会将这两个报文都丢弃；若这两个无线终端的信号强度差距较大，那么无线接入点会将信号强度较差的无线终端发送的报文丢弃。如果将信号强度高的无线终端作为目标无线终端，首先能够保证信号强度高的无线终端之间不会抢占空口时间，也就是说保证信号强度高的无线终端发送的报文能够被接收到，不会出现报文都被丢弃的现象。其次，即便在信号强度高的无线终端向无线接入点发送报文的同时，信号强度低的无线终端也向无线接入点发送报文，那么信号强度低的无线终端发送的报文就会被丢弃掉，从而保证信号强度高的无线终端发送的信号能够不被丢弃。总的来说，就是通过放弃信号强度低的无线终端，保证信号强度高的无线终端发送的信号能够被接收到，从而实现在整体上减少丢包率的目的。
具体的，目标无线终端的信号强度需要满足第一预设条件。第一预设条件可以是所述多个目标无线终端的信号强度高于或等于第一预设信号强度，或，多个目标无线终端的信号强度分别高于或等于各自的历史最大信号强度与第二预设信号强度之差。对于后者而言，不同的目标无线终端对应的信号强度阈值不同相同，这种方式能够考虑到无线终端的实际关联情况，更具有实用性。
第一预设条件也可以是所述多个目标无线终端为与所述无线接入点关联的无线终端中信号强度排在前第一预设数目的无线终端。
可选的，信号强度可以通过无线接入点接收来自于无线终端报文的报文接收速率得到，报文接收速率越高，表明信号强度越高；报文接收速率越低，表明信号强度越低。
除了考虑信号强度，为了减少计算量，在信号强度较高的前提下，还可以考虑优先将历史流量较高和/或距离较近的无线终端选为目标无线终端。也就是说，从所有与无线接入点关联的无线终端中，选出信号强度高且历史流量高，和/或，信号强度高且距离近的无线终端作为目标无线终端。
由于历史流量代表无线终端与无线接入点之间的交互需求，所以考虑历史流量除了为了减少静默参数的计算量，还为了尽可能的保证无线终端与无线接入点之间的通信需 求。历史流量可以通过无线终端曾经每次向无线接入点发送信号的速率和时间来进行确定。
具体的，在目标无线终端的信号强度满足第一预设条件的前提下，目标无线终端的历史流量满足第二预设条件。第二预设条件可以是多个目标无线终端的历史流量大于或等于预设流量。第二预设条件还可以是所述多个目标无线终端是满足所述第一预设条件的所有的无线终端中排在前第二预设数目个无线终端。
无线终端与无线接入点之间的距离可以通过无线接入点向无线终端发送信号的时间至无线接入点接收到来自于无线终端反馈的响应信号的时间，以及信号速率来进行计算。
具体的，在目标无线终端的信号强度满足第一预设条件的前提下，目标无线终端与无线接入点的距离满足第三预设条件。第三预设条件可以是所述多个目标无线终端与所述无线接入点的距离小于或等于预设距离。第三预设条件还可以是所述目标无线终端为满足第一预设条件或第二预设条件的所有无线终端中排在前第三预设数目的无线终端。
基于以上实施例提供的一种无线通信方法，本申请实施例还提供了一种无线接入点，包括：
发送单元，用于向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
可选的，所述多个目标无线终端中各个目标无线终端的所述非静默时间段的时长基于对应的目标无线终端的历史流量。
可选的，所述多个目标无线终端为与所述无线接入点关联的所有无线终端中满足至少一个预设条件的无线终端，所述至少一个预设条件包括第一预设条件，所述第一预设条件包括：
所述多个目标无线终端的信号强度高于或等于第一预设信号强度；或，
所述多个目标无线终端的信号强度分别高于或等于各自的历史最大信号强度与第二预设信号强度之差；或，
所述多个目标无线终端为与所述无线接入点关联的所有无线终端中信号强度排在前第一预设数目的无线终端。
可选的，所述至少一个预设条件还包括第二预设条件，所述第二预设条件包括：
所述多个目标无线终端的历史流量大于或等于预设流量；或，
所述多个目标无线终端是满足所述第一预设条件的所有的无线终端中历史流量排在前第二预设数目个无线终端。
可选的，所述历史流量包括以下一个或多个：
历史空口占用时间，历史数据量和历史报文数量。
可选的，所述至少一个预设条件还包括第三预设条件，所述第三预设条件包括：
所述多个目标无线终端与所述无线接入点的距离小于或等于预设距离。
本申请实施例还提供了一种无线通信系统，所述系统包括无线接入点和多个目标无线终端，所述无线接入点与所述多个目标无线终端关联；
所述无线接入点，用于向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠；
所述多个目标无线终端，用于按照各自的所述静默参数向所述无线接入点发送无线信号。
本实施例减少了无线接入点丢包现象的出现。
本申请实施例还提供了一种无线接入点，参见图4，该图为本实施例提供的无线接入点的结构框图。
所述无线接入点20包括：无线接口201、有线接口202、存储器203、处理器204等部件。本领域技术人员可以理解，图4中示出的无线接入点20的结构并不构成对无线接入点的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
无线接口201可以用于与无线终端进行无线通讯，通常包括天线和无线网卡。
有线接口202可以用于与上级网络设备进行通讯，通常包括有线网卡。
存储器203中存储有程序，处理器204通过运行存储在存储器203中的程序，从而执行无线接入点20的各种功能以及数据处理。
在AP中，存储器203通常为内存。
处理器204是无线接入点20的控制中心，利用各种接口和线路连接整个无线接入点20的各个部分，通过运行或执行存储在存储器203内的软件程序和/或模块，以及调用存储在存储器203内的数据，执行无线接入点20的各种功能和处理数据，从而对无线接入点20进行整体监控。
无线接入点20还包括给各个部件供电的电源205,比如有源以太网(英文：Power Over Ethernet，POE)，可选的，电源205可以通过电源管理系统与处理器204逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。
在本申请实施例中，所述处理器204用于：
通过无线接口201向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应 的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
本实施例减少了无线接入点丢包现象的出现。
在上述实施例中，可以全部或部分地通过软件、硬件或者其组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、双绞线、光纤)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存储的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，光盘)、或者半导体介质(例如固态硬盘(SSD))等。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，而这些修改并不使相应技术方案脱离权利要求的范围。

Claims (15)

  1. 一种无线局域网(WLAN)通信方法，其特征在于，所述方法包括：
    无线接入点向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
  2. 根据权利要求1所述的方法，其特征在于，所述多个目标无线终端中各个目标无线终端的所述非静默时间段的时长基于对应的目标无线终端的历史流量。
  3. 根据权利要求2所述的方法，其特征在于，所述历史流量包括以下一个或多个：
    历史空口占用时间，历史数据量和历史报文数量。
  4. 根据权利要求1至3中任意一项所述的方法，其特征在于，所述多个目标无线终端为与所述无线接入点关联的所有无线终端中满足至少一个预设条件的无线终端，所述至少一个预设条件包括第一预设条件，所述第一预设条件包括：
    所述多个目标无线终端的信号强度高于或等于第一预设信号强度；或，
    所述多个目标无线终端的信号强度分别高于或等于各自的历史最大信号强度与第二预设信号强度之差；或，
    所述多个目标无线终端为与所述无线接入点关联的所有无线终端中信号强度排在前第一预设数目的无线终端。
  5. 根据权利要求4所述的方法，其特征在于，所述至少一个预设条件还包括第二预设条件，所述第二预设条件包括：
    所述多个目标无线终端的历史流量大于或等于预设流量；或，
    所述多个目标无线终端是满足所述第一预设条件的所有的无线终端中历史流量排在前第二预设数目个无线终端。
  6. 根据权利要求4或5所述的方法，其特征在于，所述至少一个预设条件还包括第三预设条件，所述第三预设条件包括：
    所述多个目标无线终端与所述无线接入点的距离小于或等于预设距离。
  7. 一种无线局域网(WLAN)中的无线接入点，其特征在于，所述无线接入点包括：
    发送单元，用于向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个 静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
  8. 根据权利要求7所述的无线接入点，其特征在于，所述多个目标无线终端中各个目标无线终端的所述非静默时间段的时长基于对应的目标无线终端的历史流量。
  9. 根据权利要求8所述的无线接入点，其特征在于，所述历史流量包括以下一个或多个：
    历史空口占用时间，历史数据量和历史报文数量。
  10. 根据权利要求7至9中任意一项所述的无线接入点，其特征在于，所述多个目标无线终端为与所述无线接入点关联的所有无线终端中满足至少一个预设条件的无线终端，所述至少一个预设条件包括第一预设条件，所述第一预设条件包括：
    所述多个目标无线终端的信号强度高于或等于第一预设信号强度；或，
    所述多个目标无线终端的信号强度分别高于或等于各自的历史最大信号强度与第二预设信号强度之差；或，
    所述多个目标无线终端为与所述无线接入点关联的所有无线终端中信号强度排在前第一预设数目的无线终端。
  11. 根据权利要求10所述的无线接入点，其特征在于，所述至少一个预设条件还包括第二预设条件，所述第二预设条件包括：
    所述多个目标无线终端的历史流量大于或等于预设流量；或，
    所述多个目标无线终端是满足所述第一预设条件的所有的无线终端中排在前第二预设数目个无线终端。
  12. 根据权利要求10或11所述的无线接入点，其特征在于，所述至少一个预设条件还包括第三预设条件，所述第三预设条件包括：
    所述多个目标无线终端与所述无线接入点的距离小于或等于预设距离。
  13. 一种无线局域网(WLAN)通信系统，其特征在于，所述系统包括无线接入点和多个目标无线终端，所述无线接入点与所述多个目标无线终端关联；
    所述无线接入点，用于执行权利要求1-6中任意一项所述的方法；
    所述多个目标无线终端，用于按照各自的所述静默参数，仅在各自的非静默时间段向所述无线接入点发送无线信号。
  14. 一种无线局域网(WLAN)中的无线接入点，其特征在于，所述无线接入点包括处理器和无线接口，所述处理器用于用所述无线接口向多个目标无线终端发送多个静默参数，所述多个目标无线终端和所述多个静默参数一一对应，所述多个目标无线终端与所述无线接入点关联，所述多个静默参数中的每一个包括静默周期和静默间隔，任意一个静默参数中所述静默周期的时长为所述静默间隔的时长和非静默时间段的时长之和，所述静默间隔是指不允许对应的目标无线终端发送报文的时间段，所述非静默时间段是指允许对应的目标无线终端发送报文的时间段，所述多个目标无线终端中任意两个目标无线终端的非静默时间段不重叠。
  15. 一种计算机程序产品，其特征在于，所述计算机程序在被执行时使得无线接入点执行权利要求1-6中任意一项所述的方法。
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