CN110177398A - 用于低功率设备的频带引导 - Google Patents
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- CN110177398A CN110177398A CN201910131000.8A CN201910131000A CN110177398A CN 110177398 A CN110177398 A CN 110177398A CN 201910131000 A CN201910131000 A CN 201910131000A CN 110177398 A CN110177398 A CN 110177398A
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Abstract
接入点被配置为通过多个无线通信信道与无线客户端设备通信。无线客户端设备具有活跃操作状态和待机操作状态。接入点检测第一无线通信信道和第二无线通信信道中每一个的特性,并对检测到的特性应用策略以选择第一无线通信信道和第二无线通信信道中的一个。当无线客户端设备处于活跃操作状态时,接入点引导客户端设备通过所选择的信道与接入点通信。
Description
相关申请交叉引用
本申请要求于2018年2月20日提交的第62/633,017号美国临时申请的权益,上述申请的内容通过引用整体并入本文。
技术领域
本发明涉及用于低功率无线设备的频带引导。
背景技术
无线接入点使计算设备能够与网络中的其他设备通信。计算设备可以将数据发送到接入点用于通过网络传输,或者从产生于网络中的另一设备的接入点接收数据。接入点和计算设备可以经由多个通信信道彼此通信,每个通信信道代表接入点和计算设备之间的逻辑耦合并且指定传输到设备或从设备传输的信号的频率范围。
通常,接入点选择用于接入点和计算设备之间进行通信的信道。计算设备可以,例如在多个信道上向接入点发送探测请求,而接入点可以选择用于通信的信道并且仅在所选择的信道上响应探测请求以使得计算设备经由所选择的信道进行通信。为了确保计算设备和接入点之间的可靠通信,计算设备可以向接入点频繁地发送探测请求,例如每秒一次。如果通过原始信道的通信经历干扰或延迟,则这些频繁的探测请求使接入点能够快速选择新信道。然而,每个探测请求和信道切换消耗计算设备的功率。对于低功率设备,例如使用没有专用电源线的电池供电的那些设备,频繁切换通信信道会消耗过多的功率并减少每次电池充电可以续航的时间。
附图说明
图1A是可实施本文所公开的一个或多个实施例的代表性计算机网络环境。
图1B是列出了2.4GHZ频带中的信道的频率范围的图表。
图1C是列出了5GHz频带中的信道的中心频率的图表。
图2是示出了根据某些实施例的无线设备的部件的方框图。
图3是示出了根据某些实施例的由无线设备执行的功能性模块的方框图。
图4是示出了根据某些实施例的由接入点执行的功能性模块的方框图。
图5是示出了根据某些实施例的用于执行低功率设备频带引导的过程的流程图。
图6是示出了可实施本文所描述的至少某些操作的示例的处理系统的方框图。
具体实施方式
接入点通过多个可用的无线电通信信道之一与无线客户端设备通信。接入点基于信道的性能或要在信道上通信的数据的属性来选择通信信道。虽然无线设备可以是能够通过网络进行通信的任何设备,但是本文所述的无线设备的几种实施例是关于能够捕捉视频并将视频通过无线网络传输到远程接入点和/或服务器的视频摄像头。视频摄像头可以用作,例如住宅或办公室安保摄像头,其保持在基本静止的位置(例如,在前门)。这里要指出,当设备(例如,无线安保摄像头)的位置不频繁变化时,与设计了典型无线通信标准的更具移动性的设备相比,设备不需要频繁地连接到无线接入点和从无线接入点断开连接。此外,例如视频摄像头的专用客户端设备可能不频繁地与接入点通信。例如,由动作触发的视频摄像头可以每天仅开启几分钟以捕捉和传输视频数据,而其他时间在待机或低功率状态下操作。为了减少客户端设备消耗的功率量,接入点可以实施本文公开的几种技术,例如,限制接入点从多个可用通信信道中选择通信信道的频率并使得客户端设备切换到不同的通信信道。在某些示例中,接入点可以在客户端设备活跃时将客户端设备从第一信道切换到第二信道,但是当客户端设备处于待机状态时不进行切换。接入点可以附加地或替代地使用由客户端设备检测到的信道特性,例如客户端设备对特定信道上干扰的测量值,以选择通信信道。
在以下描述中,阐述了诸如指定部件,电路,和过程的示例的许多具体细节以提供对本公开的透彻理解。而且,在以下描述中出于解释的目的,阐述了具体的术语以提供对本实施例的透彻理解。然而,对本领域技术人员来说显而易见的是,可能不需要这些具体细节来实践本实施例。在其他情况下,以方图示出了公知电路和设备以避免模糊本公开。
如本文中所使用的术语“耦合”意味着直接连接到或者通过一个或多个中间部件或电路来连接。通过本文描述的几种总线所提供的任何信号可以与其他信号时分多路传输并且通过一个或多个公共总线提供。另外,电路元件或软件框图之间的互连可以被显示为总线或单个信号线。或者,每个总线可以是单个信号线,每个单个信号线也可以是总线,并且单个线或总线可以代表用于部件之间通信(例如,网络)的无数物理或逻辑机制中的任何一个或多个。本实施例不应被解释为限于本文描述的指定示例,而是在其范围内包括由所附权利要求限定的所有实施例。
图1A是可实施某些实施例的代表性计算机网络环境100。环境100包括接入点110,无线设备120,和远程服务器130。图1A中未显示的其他部件也可包括在环境100中。例如,环境100可进一步包括接入点110,远程服务器130,和无线设备120之间的中间设备(例如,交换机,路由器,集线器等)。此外,环境100可包括多个接入点110,远程服务器130,和/或无线设备120。
无线设备120是通信地耦合到接入点110和远程服务器130的计算设备。在一个实施例中,无线设备120是被配置为捕捉和传输视频数据的摄像头。无线设备120可以是任何合适的网络连接的摄像头(或“IP摄像头”)。例如,无线设备120可以作为住宅或办公室中的安保摄像头操作。在这些情况下,无线设备120可以是相对静止的,在大多数时间保持在大致相同的物理位置。可以预期的是,配备有视频和音频记录技术的设备120的附加示例可以包括计算或移动设备,包括例如智能手机,平板电脑,笔记本电脑,个人数字助理(PDA)等。设备120的附加示例可以包括可以连接到互联网的家庭传感器(例如,动作检测传感器和温度传感器)。
无线设备120可被配置为在活跃的,高功率状态和待机的,低功率状态下操作。在活跃状态下,无线设备120可以产生或捕捉数据,例如视频数据,并与其他设备通信。在待机状态下,无线设备120可以通过不与其他设备通信以及关闭一个或多个部件(例如摄像头和主处理器)来降低功耗。当处于待机状态时,无线设备120也不向接入点110发送信道探测。
与无线设备120处于待机状态的时间量相比,无线设备120处于活跃状态的时间量可能相对较短。例如,无线设备120可以保持空闲直到通过输入(例如用户输入或来自动作检测器的输入)触发以捕捉视频数据。无线设备120还可以具有预定的唤醒间隔,此时设备从待机状态切换到活跃状态以检查网络状况,将任何存储的数据传输到接入点110或执行其他任务。例如,唤醒间隔可以是8小时,使得如果在该间隔中没有接收到触发输入,则设备120在8小时后变为活跃状态。
接入点110使无线设备120能够向远程服务器130交换数据和从远程服务器130交换数据。尽管为简单起见未示出,但是接入点110可包括一个或多个处理器,该处理器可以是通用处理器或者是提供算法和控制功能以实施本文关于接入点110所公开的技术的专用集成电路。处理器可包括高速缓存(为简单起见未示出)以及其他存储器(例如,主存储器和/或非易失性存储器,例如硬盘驱动器或固态驱动器)。在一些例子中,高速缓存使用SRAM实施,主存储器使用DRAM实施,非易失性存储器使用闪存或一个或多个磁盘驱动器实施。根据某些实施例,存储器可以包括一个或多个存储器芯片或模块,并且接入点110上的处理器可以执行存储在其存储器中的多个指令或程序代码。处理器执行的部分或全部指令或程序代码可以统称为应用112。当处理器执行时,应用112可以管理接入点110用于与无线设备120通信的通信信道。
无线设备120可以经由多个可用通信信道115无线地电耦接到接入点110并与接入点110通信。尽管图1A中仅示出了三个信道110,无线设备120和接入点110可以被配置为通过任意数量的信道115进行通信。每个信道115代表在无线设备120和接入点110之间传输的信号的频率。信道115可以在一个或多个定义一系列信号频率的频带内被分配,例如2.4GHz频带(包括2.4GHz至2.5GHz的频率)和5GHz频带(包括5GHz至6GHz的频率)。图1B是列出了分配给2.4GHz频带的14个信道中的每个信道的频率范围的图表,并且图1C是列出了分配给5GHz频带的24个信道中的每一个的中心频率的图表。图1B和1C中示出的一些信道可以仅在一些地理区域中可用,而其他地理区域可以使用不同的或更多的信道。作为示例,信道115可以包括与2.4GHz频带相关联的三个信道:一个以2412MHz为中心(图1B中的信道1),一个以2437MHz为中心(信道6),以及一个以2462MHz为中心(信道11)。类似地,5GHz频带可以包括分布在为该频带定义的频率范围上的多个信道。可以将一个或多个信道115分配给雷达系统(称为“DFS信道”),并且无线设备120可以采用动态频率选择(DFS)来使用这些信道。当以DFS模式操作时,无线设备120监视雷达信号的信道,并且如果检测到信号,则自动切换到另一信道以减少对雷达信号的干扰。
接入点110通过天线116以信道频率发送信号或者通过天线116以信道频率接收信号,在信道115的一个上与无线设备120通信。接入点110可以包括多个天线116,其被配置为在不同信道115上接收或发送数据。例如,接入点110可以具有第一天线116,其被配置为在与2.4GHz频带相关联的信道上通信,而第二天线116被配置为在与5GHz频带相关联的信道上通信。
接入点110可以选择用于与无线设备120通信的特定信道,并将无线设备120引导到所选择的信道。为了执行频带引导,接入点110监听由无线设备120在每个可用信道115上发送的探测,并响应于所选择的信道上的探测。当无线设备120接收到响应时,无线设备120可以通过所选择的信道传送未来的通信。
无线设备120和接入点110之间的通信可以使用,例如IEEE 802.11系列标准(例如,无线LAN)和/或其他合适类型的区域网络技术,例如IEEE 802.11系列标准的竞争或替代标准(例如,WiMAX),并且可以包括任何合适的中间无线网络设备,包括,例如,基站,路由器,网关,集线器等。根据实施例,在无线设备120和接入点110之间连接的网络技术可以包括其他合适的无线标准,诸如众所周知的蓝牙通信协议或近场通信(NFC)协议。在一些实施例中,设备120和接入点110之间的网络技术可以包括定制版本的WLAN,蓝牙或其他合适的无线技术的定制版本。
远程服务器130包括远离无线设备120并且能够通过网络进行通信的一个或多个计算设备。无线设备120可以将数据传送到远程服务器130以用于数据的存储或使用,或者使用户能够访问数据。例如,远程服务器130可以是计算设备,其被用户用来查看由无线设备120捕获的视频数据或者存储和分析由无线设备120捕获或生成的数据。作为另一个例子,远程服务器130可以包括与云存储服务相关联的一个或多个存储设备,并且被配置为存储从无线设备120接收的数据。
在一些实施例中,接入点110和远程服务器130可以无线地被耦合(例如,其可以包括采用IEEE 802.11无线网络,或基于诸如3G,3.5G 4G长期演进(LTE)等的无线电话服务的数据流量网络)。支持接入点110和远程服务器130之间的通信的技术可以包括以太网(例如,如IEEE 802.3系列标中所描述的)和/或其他合适类型的区域网络技术,例如IEEE802.11系列标准的竞争或替代标准(例如,WiMAX)。IEEE 802.11系列标准中的不同无线协议的示例可以包括IEEE 802.11a,IEEE 802.11b,IEEE 802.11n,IEEE 802.11ac,IEEE802.11af,IEEE 802.11ah,和IEEE 802.11ad。
图2示出了根据一个实施例的无线设备120的部件的框图。如图2所示,无线设备120可以包括处理器210,一个或多个天线215,无线网络电路220,存储器230,摄像头240和动作传感器250,它们可以经由一个或多个总线260彼此通信。
存储器230是包括易失性或非易失性存储设备的机器可读介质。存储器230的一个或多个存储器设备可以集成在无线设备120内,例如作为嵌入式存储器。存储器230可以附加地或替代地包括外部或可移动存储器设备,例如安全数字(SD)卡。存储器230可以存储由处理器210执行的指令,以及由无线设备120产生的视频数据或其他数据。处理器210可执行的某些或所有指令可以共同被应用232代表。应用232可以与由接入点110执行的应用112通信。
无线网络电路220能够使无线设备120和接入点110之间进行无线通信。无线网络电路220产生信号用于通过天线215传输到接入点110,或接收在天线215处检测到的信号。
摄像头240捕捉视频数据。视频捕捉可以由输入启动,例如用户输入或动作传感器250检测到的动作输入。
图3是示出了根据某些实施例的由无线设备120执行的在应用232内的功能性模块的方框图。图3中所示的模块可以包括存储在存储器230中并且可由处理器210执行的软件。在一个实施例中,无线设备120执行视频捕捉模块335,信道评估模块310,和通信模块315。其他实施例可以包括更多的,更少的,或者不同的模块,以及功能可以在模块之间不同地分布。
视频捕捉模块305控制摄像头240捕捉视频数据。可以以固定帧速率或可变帧速率捕捉视频数据。视频捕捉模块305可以通过使用诸如H.264或H.265的几种编解码器中的任何一种编解码器来编码或压缩视频数据用于存储或传输。视频捕捉模块305可以响应于指定的输入(例如,用户的输入或动作的检测)来启动视频捕捉。例如,如果视频捕捉模块305从动作传感器250接收到表示在摄像头240的视域内检测到动作的信号,则视频捕捉模块305打开摄像头240以捕捉视频数据或开始存储由摄像头240捕捉的视频数据。视频捕捉模块305可以响应于每个动作事件捕捉指定时间长度的视频数据,例如10秒。类似地,如果响应于用户输入而启动视频捕捉,则视频捕捉模块305可以捕捉指定时间段的视频数据,或者可以捕捉视频数据直到接收到结束视频捕捉的第二用户输入。
视频捕捉模块305可以将视频数据存储到无线设备120或者将数据传输到外部设备,例如远程服务器130。在一个实施例中,视频捕捉模块305识别存储器230和/或外部存储设备中无线设备120可用的存储量。视频捕捉模块305可以周期性地确定存储量,例如在结束视频捕捉之后或者以指定的时间间隔(例如,每小时一次)。如果可用存储大于阈值,则视频捕捉模块305可将视频数据存储到存储器和/或外部存储设备。
视频捕捉模块305可以附加地或可替代地经由接入点110将视频数据传输到远程服务器130。视频数据可以在被捕捉时基本上实时传输。例如,视频捕捉模块305可以在数据被记录时将流数据编码并直播到远程服务器130。视频数据可以替代地以预定频率或选择的时间被传输。在一个实施例中,如果无线设备120上的可用存储低于阈值,则传输视频数据。例如,如果视频捕捉模块305检测到可用存储低于阈值,则可以将任何新捕捉的视频数据传输到远程服务器130而不是存储在无线设备120处。或者,如果可用存储低于阈值,则可以将较旧的视频数据传输到远程服务器130以为新捕捉的视频数据提供空间。在另一实施例中,视频捕捉模块305接收关于通信信道115的信息并基于所接收的信息确定是否存储视频数据。这样的信息可以包括信道的容量,信道的延迟,信道的频率,或其他特性。例如,如果频道115具有低于指定阈值的容量,则视频捕捉模块305可以将视频数据存储在存储器230内直到信道容量增加。在又一实施例中,视频捕捉模块305以预定频率将无线设备120存储的任何视频数据传输到远程服务器130,例如每天一次或每周一次。
视频捕捉模块305可以根据数据是由无线设备120首先存储或者首先传输到远程服务器130来调整视频数据的属性。例如,当实时流式传输视频数据到远程服务器130时,视频捕捉模块305可以以较低分辨率记录视频数据,并且在传输视频数据之前由无线设备120存储视频数据时,以较高分辨率记录视频数据。类似地,如果数据是本地存储的,则视频捕捉模块305可以记录较短的视频,以及如果数据被实时传输到远程服务器130,则视频捕捉模块305可以记录较长的视频。
信道评估模块310测量无线设备120和接入点110之间的通信信道115的特性。测量特性可以包括在无线设备120的天线215处检测到的信道干扰,信道上的信号强度,信道容量,或信道上掉包(dropped packets)的数量。可以通过接收信号强度指示(RSSI),分贝毫瓦(dBm),或其他度量来测量信号强度,并且信道评估模块310可以测量从无线设备传输到接入点110以及从接入点110传输到无线设备120的信号中一个或两个的信号强度。信道容量代表数据可以在信道上进行通信同时保持低于指定阈值的错误率的速率。当测量掉包的数量时,信道评估模块310可以测量数据包丢失的绝对数量(例如,在给定传输中丢失的数量)或丢包率(例如,在指定时间段内丢掉的数据包的数量)。
通信模块315管理无线设备120捕捉的数据,包括传送数据到接入点110和从接入点110接收数据以及确定是否在本地存储捕捉的数据。通信模块315还可以与应用112通信以将无线设备120引导到接入点110选择的信道115。例如,通信模块315可以将传输探测至信道115上的接入点110,并监听信道115上的探测响应。
应用232的某些部分可以由功能有限的低功率处理器执行,而不是由主处理器210执行。例如,当主处理器210处于待机模式时,信道评估模块310可使低功率处理器检测信道属性。
图4是示出了根据一个实施例的在应用112内的并且由接入点110执行的功能性模块的方框图。图4所示出的模块可包括可由接入点110的处理器执行的计算机程序指令。在一个实施例中,接入点110执行信道评估模块410和信道选择模块415。其他实施例可以包括更多的,更少的,或者不同的模块,以及可以在模块之间不同地分布的功能。
信道评估模块410与无线设备120执行的信道评估模块310类似,可以测量无线设备120和接入点110之间的通信信道115的特性。所测量的特性可以包括在与接入点110相关联的一个或多个天线上检测到的信道干扰,信道上的信号强度,信道容量,或信道上掉包的数量。
信道选择模块415应用策略以选择用于与无线设备120传送数据的信道115。信道115可以基于每个可用信道的特性,数据的属性,启发式或其任何组合来选择,并且每个策略指定信道选择模块415如何基于这些特征选择信道115。
在一个实施例中,信道选择模块415应用了使较高频信道优于较低频信道的策略。例如,信道选择模块415可以选择与5GHz频带相关联的信道(每当可用时),即使与2.4GHz频带相关联的信道也可用。
信道选择模块415可以应用使用与多个信道115中的每个信道相关联的干扰测量值以选择信道的策略。在一个实施例中,如果在接入点110处的信道上所测量的干扰低于阈值,则信道选择模块415选择信道。信道选择模块415还可以使用在无线设备120处所测量的干扰以选择信道。例如,如果在接入点110处测量的干扰和在无线设备120处测量的干扰均不超过指定阈值,则信道选择模块415可以选择信道。
信道选择模块415可以通过有监督或无监督机器学习模型预测每个信道115上的干扰量,并使用所预测的干扰以选择信道115。该模型可以产生将信道上的干扰与例如一天中的时间,一周中的星期几,或数据类型等因素相关联函数。使用所产生的函数,信道选择模块415可以预测在指定时间对多个信道中的每个信道预期的干扰量,并选择最可能具有低干扰的信道115。
信道选择模块415可以应用基于在信道上所测量的信号强度选择信道115的策略。例如,如果上行链路信号强度(例如,对于从无线设备120传输到接入点110的信号)和下行链路信号强度(例如,对于从接入点110传输到无线设备120的信号)均大于各自的阈值,则信道选择模块415选择信道。作为另一个示例,策略可以指定,由于无线设备120是一个向接入点110传输的数据比从接入点110接收的数据明显更多的摄像头,因此,如果上行链路信号强度大于指定阈值,则可以选择信道,而不考虑下行链路信号强度。
信道选择模块415可以应用基于被用于编码视频数据的视频编解码器选择信道115的策略。信道选择模块415从无线设备120的视频捕捉模块305接收视频编解码器的标识,并且可以基于视频捕捉模块305曾经或将要使用的编解码器选择信道。为了选择信道,信道选择模块415可以查找编解码器的属性,例如压缩比,并选择具有与编解码器的属性匹配的特性的信道115。例如,信道选择模块415在传输由压缩比相对较低的编解码器压缩的数据时(即压缩后的数据大小是压缩前数据大小的相对较高的百分比)可以选择大容量信道,而如果由高压缩比的编解码器压缩视频数据则可以选择任何信道。
信道选择模块415可以应用基于视频分辨率选择信道115的策略。高分辨率视频可以选择高容量信道,而低分辨率视频可以选择任何信道。
信道选择模块415可以应用基于视频持续时间选择信道115的策略。无线设备120传输的视频的持续时间可能相对类似。例如,无线设备120可以在每次检测到动作时传输10秒的视频。因此,信道选择模块415可以使用计算平均值或中间视频持续时间以选择信道115。在一个实施例中,如果视频数据的持续时间小于指定的阈值,则信道选择模块415可以选择低容量信道。如果视频数据的持续时间大于指定的阈值,则可以选择更高容量的信道。类似地,如果无线设备120在传输视频数据之前有足够的可用空间用于缓冲视频数据,则可以选择较低吞吐量的信道,而如果无线设备120无法缓冲视频数据,则可以选择较高吞吐量的信道。如果缓冲区大小至少等于视频数据量(根据视频长度和比特率计算),则可以确定无线设备120具有足够的缓冲空间。或者,如果缓冲区能够容纳至少指定百分比的视频数据(例如,75%),则可以确定无线设备120具有足够的缓冲空间。
信道选择模块415可以应用基于视频的存储位置选择信道115的策略。如上所述,视频数据可以本地存储在无线设备120上,存储在远程服务器130上,或者实时流式传输到一个或多个其他设备。对于实时流式传输应用,在捕捉视频数据时,远程用户可能正在基本上实时查看视频数据,与具有更高延迟的信道相比,低延迟信道可能更可取。因此,信道选择模块415可以测量一个或多个信道上的延迟,并选择延迟低于指定阈值的信道。信道选择模块215还可以附加地或替代地选择与较高频带(例如,5GHz频段)相关联的信道,所述信道的选择基于确定所述较高频率信道可能比与较低频带(例如2.4GHz频带)相关联的信道具有更低的延迟。
信道选择模块415可以应用基于给定信道上的掉包的数量选择信道115的策略。当无线设备120向接入点110传输数据或从接入点110接收数据时,接入点110和/或无线设备120可以维持掉包的计数。如果掉包的数量超过阈值,则信道选择模块415选择不同的信道115。可以针对信道上掉包的总数或掉包率来定义阈值。
信道选择模块415可以应用基于DFS信道的可用性选择信道115的策略。如上所述,DFS信道是为雷达系统使用而设的信道。例如IEEE 802.11之类的协议可以定义消费设备可以使用DFS信道进行通信的条件。这些条件包括,例如用于监视DFS信道以发现由雷达系统传输的信号的程序,如果检测到雷达信号则提供给消费设备引导其离开DFS信道的时间量,以及消费设备在引导到信道之前必须监视信道中的雷达信号的时间量。消费设备使用DFS信道的能力可以以遵守协议为条件。
DFS信道通常可以具有比其他信道更低的延迟和更高的吞吐量,因此对于某些类型的数据传输可能是期望的。因此,信道选择模块415可以根据协议确定DFS信道是否可用。如果DFS信道可用,则信道选择模块415可以选择其他信道上的DFS信道。相反,信道选择模块415可以优先使用DFS信道用于需要高吞吐量或低延迟的应用。例如,如果无线设备120用于传输的数据是高分辨率或者被实时流式传输到一个或多个其他设备,则信道选择模块415可以选择DFS信道。如果数据是较低分辨率或由无线设备120本地存储,则即使DFS信道可用,信道选择模块415也可以选择非DFS信道。或者,信道选择模块415可以确定特定的无线设备120不应该通过DFS信道进行通信,例如,为了避免如果检测到雷达信号该设备被迫引导到不同的信道所导致的延迟或丢失来自设备的部分数据流。
在某些情况下,当接入点110经由另一天线与无线设备120通信时,信道选择模块415可以控制接入点110的天线以确定DFS信道的可用性。例如,如果DFS信道的协议指定了接入点在通过信道进行通信之前必须监听信道上的雷达信号的时间量,则接入点天线可以收听信道并监听所需的时间量。然后,协议可以允许接入点110在需要再次监听雷达信号之前,通过信道进行通信一指定的时间量,例如1小时。不用于与无线设备120通信的天线可以在多个DFS信道进行循环访问,识别可用的任何信道并且如果存在数据加载的属性的改变或另一信道的特性的改变,则使接入点110能够快速地将无线设备120引导到DFS信道。在其他情况下,当无线设备120处于待机模式时,信道选择模块415可以控制天线以确定DFS信道的可用性。例如,如果无线设备120被设置为通过第一信道与接入点110通信,则可以重新调谐天线以在无线设备120处于待机模式时在DFS信道上监听雷达信号。然后可以将天线重新调谐到第一信道,直到无线设备120变为活跃状态,并且,如果DFS信道可用,则用于将无线设备120引导到DFS信道。
信道选择模块415可以组合上述两个或多个策略以选择信道115。也就是说,信道选择模块415可以使用两个或多个信道特性,或两个或多个视频属性以选择信道。在策略之间发生冲突的情况下,信道选择模块415可以为策略定义优先级。例如,如上文所述,信道选择模块415可以应用为实时流式传输应用选择具有低于阈值的延迟的信道的第一策略,以及为高分辨率数据选择具有高于阈值容量的信道的第二策略。如果无线通信设备120正在传输高分辨率的,实时流式传输的数据,则在选择同时具有低于指定阈值的延迟和容量的第一信道和具有高于阈值的延迟和容量的第二信道时,信道选择模块415应用的策略可能会冲突。在这种情况下,信道选择模块415可以对策略应用优先级排序,例如,选择用于传输数据的低延迟信道。
如果信道选择模块415选择的信道与当前用于与无线设备120通信的信道不同,则接入点110将无线设备120从当前信道引导至所选信道。
图5是示出了根据一个实施例的用于低功率客户端设备执行频带引导的过程500的流程图。过程500可由接入点110执行。过程500的其他实施例可包括与图5所示出的不同的,更多的,或更少的步骤,并且这些步骤可按不同顺序执行。
如图4所示出的,接入点110通过第一无线通信信道与无线设备120通信502。通信可以包括,例如由无线设备120捕捉并发送到接入点110以便传输到远程服务器130的视频数据。
接入点110检测504至少第一信道和第二无线通信信道的特性。信道特性可以包括,例如信道上的干扰量,信道上的信号强度,信道上掉包的数量,以及信道的容量。接入点110还可以从无线设备120接收506信道特性的测量值。例如,无线设备120可以向接入点110传输关于在信道上测量的无线设备的干扰的信息。
接入点110确定508将通过信道从无线设备120传输到接入点110的数据属性,包括例如数据量或数据存储位置。当无线设备120包括被配置为捕捉视频数据的摄像头时,无线设备120可以基于属性确定数据量,例如用于压缩视频数据的视频编解码器,视频的比特率,视频的分辨率或视频的持续时间。
接入点110基于每个信道的特性和/或数据属性确定510是否从第一信道改变为第二信道。为了选择信道,接入点110可以应用一个或多个策略。策略可以为信道特性指定值的范围,使得策略的应用让接入点110选择具有在值的指定范围内的特性的信道而不是选择具有在值的范围之外的特性的信道。其他策略可以指定某些信道特性适用于要被传输的数据的特定属性。接入点110可以应用这些策略中的一个以选择具有与数据的一个或多个属性匹配的一个或多个特性的信道,而不选择其特性与数据属性不匹配的信道。
如果接入点110确定需要信道切换,则在无线设备120处于活跃状态时,接入点110将无线设备120引导到第二个信道。也就是说,接入点110不会将无线设备120从待机状态唤醒以从第一信道切换到第二信道,而是等待直到无线设备120变为活跃状态(例如,当无线设备120由动作输入触发,或以预定的唤醒间隔触发时)。然后无线设备120和接入点110可以通过第二信道通信。
在某些情况下,由于第一信道或第二信道的特性满足指定标准,因此接入点110可确定应将第一信道或第二信道改变为第三信道。例如,如果在第一信道上测量的干扰量大于阈值的时间超过了指定的时间长度,则接入点110可确定应使用第三信道而不是第一信道。类似地,如果第一信道是DFS信道,则如果在DFS信道上检测到雷达信号,那么接入点110可以切换到第三信道。当切换天线以通过第三信道而不是第一信道或第二信道进行通信时,接入点110可以将之前通过第一信道或第二信道进行通信的天线调谐到与第三信道相关联的频率。当与天线相关联的信道被切换时,接入点110可以通过天线向与接入点通信的任何无线设备发送信道切换通告。如果多个无线设备通过天线通信,则可以在不同的时间向每个无线设备发送信道切换通告。在一个实施例中,当设备处于待机状态时,接入点110可以向每个无线设备发送信道切换通告,以确保当设备变为活跃状态时,无线设备传输的初始数据(例如第一视频帧)不会丢失。在另一实施例中,接入点110在无线设备处于活跃状态时发送信道切换通告,而不是将无线设备从待机状态唤醒。
图6是示出了可实施本文所描述的至少某些操作的处理系统600的示例的方框图。处理系统600可包括一个或多个中央处理单元(“处理器”)602,主存储器606,非易失性存储器610,网络适配器612(例如,网络接口),视频显示器618,输入/输出设备620,控制设备622(例如,键盘和指示设备),包括存储介质626的驱动单元624,和与总线616通信地连接的信号产生设备630。总线616被示出为一个抽象概念,它代表任何一个或多个单独的物理总线,点对点连接,或者两者都由适当的桥接器,适配器或控制器连接。因此,总线616可包括,例如系统总线,外设部件互连(PCI)总线或PCI-Express总线,超传输总线或工业标准体系结构(ISA)总线,小型计算机系统接口(SCSI)总线,通用串行总线(USB),IIC(I2C)总线,电气和电子工程师协会(IEEE)标准694总线,也称为“火线”。
在几种实施例中,处理系统600作为用户设备的一部分操作,尽管处理系统600也可以被连接(例如,有线或无线地)到用户设备。在网络化部署中,处理系统600可以在客户端—服务器网络环境中以服务器或客户端机器的能力操作,或者作为对等(或分布式)网络环境中的对等机器操作。
处理系统600可以是服务器计算机,客户机,个人计算机,平板电脑,笔记本电脑,个人数字助理(PDA),蜂窝电话,处理器,网络家电,网络路由器,交换机或桥接器,控制台,手持控制台,游戏设备,音乐播放器,网络连接的(“智能”)电视,电视连接的设备,或能够执行一组指令的任何便携式设备或机器(依次的或其他的)以指定处理系统600要采取的动作。
当主存储器606,非易失性存储器610和存储介质626(也称为“机器可读介质”)显示为单个介质时,术语“机器可读介质”和“存储介质”应包括存储一组或多组指令628的单个介质或多个媒体(例如,集中式或分布式数据库,和/或相关联的缓存和服务器)。术语“机器可读介质”和“存储介质”还应视为包括能够存储,编码或携带由计算系统执行的一组指令的任何介质并使计算系统执行本公开实施例的任何一种或多种方法。
通常,为实施本公开的实施例而执行的例程可以作为操作系统的一部分或作为被称为“计算机程序”的指定应用,部件,程序,对象,模块或指令序列的一部分来实施。计算机程序通常包括在计算机中的不同存储器和存储设备中的不同时间设置的一个或多个指令(例如,指令604,608,628),并且当被一个或多个处理单元或处理器602读取和执行时,使处理系统600执行涉及本公开的几个方面的元件的操作。
此外,虽然已经在功能完备的计算机和计算机系统的情境下描述了实施例,但是本领域技术人员将理解,几种实施例能够以不同形式作为程序产品被分布,并且无论特定类型的机器或计算机可读介质如何实际影响分布,本公开均适用。例如,可以通过使用虚拟机或云计算服务来实施这里描述的技术。
机器可读存储介质,机器可读介质,或计算机可读(存储)介质的其他示例包括但不限于,可记录型介质,诸如易失性和非易失性存储器设备610,软盘和其他可移动磁盘,硬盘驱动器,光盘(例如,光盘只读存储器(CD ROMS),数字通用磁盘(DVD)),和传输类型介质,例如数字和模拟通信链路。
网络适配器612使处理系统600能够通过处理系统600和外部实体支持的任何已知和/或方便的通信协议,使处理系统600外部的实体调解网络614中的数据。网络适配器612可包括网络适配器卡,无线网络接口卡,路由器,接入点,无线路由器,交换机,多层交换机,协议转换器,网关,桥接器,桥接路由器,集线器,数字媒体接收器,和/或转发器中的一个或多个。
网络适配器612可以包括防火墙,在一些实施例中,防火墙可以控制和/或管理计算机网络中的访问/代理数据的许可,并跟踪不同机器和/或应用之间的不同信任级。防火墙可以是具有硬件和/或软件部件的任何组合的任何数量的模块,其能够在特定的一组机器和应用,机器和机器,和/或应用和应用之间实行预定的访问权限,例如,以规范这些不同实体之间的流量和资源共享。防火墙还可以管理和/或访问访问控制列表,该访问控制列表详述了许可,包括例如个人,机器,和/或应用对对象的访问和操作权限,以及许可的权利在什么情况下成立。
如上所述,这里所述技术由例如用软件和/或固件编程的可编程电路(例如,一个或多个微处理器),完全以专用硬接线(即,不可编程)的电路,或以组合或此类形式实施。专用电路可以是例如一个或多个专用集成电路(ASIC),可编程逻辑设备(PLD),现场可编程门阵列(FPGA)等形式。
在前述说明书中,已经参考本实施例的特定示例性实施例描述了本实施例。然而,显而易见的是,在不脱离如所附权利要求中阐述的本公开的更宽范围的情况下,可以对其进行各种修改和改变。因此,说明书和附图应被视为说明性意义而非限制性意义。
还应该理解,图中的所有框图仅用于说明目的,并且不应排除本发明的范围以包括任何逻辑等同物或其组合,包括移除,替换,或添加其他逻辑门,其实现与本发明的特征一致的相同或相似的功能。此外,应当注意,本文公开的几种电路可以通过使用计算机辅助设计工具被描述,并且根据其行为,寄存器传输,逻辑部件,晶体管,布局几何形状,和/或其他特性作为在几种计算机可读介质中体现的数据和/或指令来表达(或代表)。可以实施这种电路表达的文件和其他对象的格式包括但不限于支持诸如C,Verilog和VHDL的行为语言的格式,支持诸如RTL的寄存器级描述语言的格式,以及支持例如GDSII,GDSIII,GDSIV,CIF,MEBES的几何描述语言的格式,以及任何其他合适的格式和语言。其中可以实现这种格式化数据和/或指令的计算机可读介质包括但不限于几种形式的非易失性存储介质(例如,光学,磁性或半导体存储介质)。
Claims (20)
1.一种无线接入点,包括:
无线电天线,其被配置为通过第一无线通信信道或第二无线通信信道与无线客户端设备通信,所述无线客户端设备具有包括活跃操作状态和待机操作状态的操作状态;以及
处理器,其与所述无线电天线耦合并配置为:
从所述无线客户端设备接收所述操作状态;
检测所述第一无线通信信道和所述第二无线通信信道中的每一个的特性;
对所检测到的特性应用策略以选择所述第一无线通信信道和所述第二无线通信信道中的一个;以及
根据所述无线客户端设备的所述操作状态,确定是否引导所述无线客户端设备通过所选择的信道进行通信。
2.根据权利要求1所述的无线接入点,其中检测所述无线信道的所述特性是在所述无线客户端设备处于所述待机操作状态时执行的。
3.根据权利要求1所述的无线接入点,其中所述处理器被配置为使得仅当所述无线客户端设备处于所述活跃操作状态时,所述处理器才引导所述无线客户端设备至所选择的信道进行通信。
4.根据权利要求1所述的无线接入点,其中所述特性是在所述第一无线通信信道和所述第二无线通信信道中的每一个上测量的干扰量,并且其中在应用所述策略时使所述处理器响应于在所述第二无线通信信道上测量的所述干扰量超过阈值时选择所述第一无线通信信道。
5.根据权利要求1所述的无线接入点,其中所述无线客户端设备包括用于捕捉视频数据的摄像头,并且其中所述处理器进一步被配置为:
接收所述无线客户端设备捕捉的所述视频数据的属性;以及
进一步根据所接收的属性选择所述第一无线通信信道和所述第二无线通信信道中的一个。
6.根据权利要求1所述的无线接入点,其中所述处理器进一步被配置为:
从所述无线客户端设备接收所述第一无线通信信道和所述第二无线通信信道中的每一个的所述属性的测量值;以及
进一步根据所接收的测量值对所接收的测量值应用所述策略以选择所述第一无线通信信道和所述第二无线通信信道中的一个信道。
7.根据权利要求1所述的无线接入点,其中所述第一无线通信信道是供雷达系统使用而设计的动态频率选择(DFS)信道,并且其中所述处理器进一步被配置为:
通过使用所述无线电天线监视所述第一无线通信信道的雷达信号;以及
响应于检测到所述雷达信号,选择所述第二无线通信信道。
8.根据权利要求1所述的无线接入点,其中所述第一无线通信信道是供雷达系统使用而设计的DFS信道,并且其中所述处理器进一步被配置为:
当所述无线接入点被设置为通过所述第二无线通信信道与所述接入点通信时,将所述无线电天线调谐到多个DFS信道中的每一个;
监视所述多个DFS信道中的每一个的雷达信号;以及
响应于在指定时间段内未在所述信道之一上检测到所述雷达信号,选择所述信道作为所述第一无线通信信道。
9.根据权利要求1所述的无线接入点,其中所述处理器进一步被配置为:
响应于检测所述第一通信信道的特性满足指定标准,切换所述无线电天线以通过第三无线通信信道与所述无线客户端设备通信。
10.根据权利要求9所述的无线接入点,其中所述无线天线与多个其他无线客户端设备通信,并且其中所述处理器进一步被配置为:
当所述第一无线客户端设备处于活跃状态时,将信道切换通告传输到多个其他无线客户端设备中的第一无线客户端设备;以及
当所述第二无线客户端设备处于活跃状态时,将所述信道切换通告传输到所述多个其他无线客户端设备中的第二无线客户端设备。
11.根据权利要求9所述的无线接入点,其中所述无线电天线与多个其他无线客户端设备通信,并且其中所述处理器进一步被配置为:
当所述第一无线客户端设备处于待机状态时,将信道切换通告传输到所述多个其他无线客户端设备中的第一无线客户端设备;以及
当所述第二无线客户端设备处于待机状态时,将所述信道切换通告传输到所述多个其他无线客户端设备中的第二无线客户端设备。
12.根据权利要求1所述的无线接入点,其中所述处理器进一步被配置为:
识别所述无线客户端设备上可用缓冲空间量和要被传输的数据量;以及
将策略应用于所述可用缓冲空间量和数据量以进一步基于所识别的量选择所述第一无线通信信道和所述第二无线通信信道中的一个。
13.根据权利要求1所述的无线接入点,其中所述处理器被进一步配置为:
使用机器学习模块以在指定时间产生对所述第一无线通信信道和所述第二无线通信信道中的每一个上的干扰量的预测;以及
在所述指定时间,将策略应用于所预测的干扰量以进一步基于所述预测选择所述第一无线通信信道和所述第二无线通信信道中的一个。
14.根据权利要求1所述的无线接入点,其中所述无线客户端设备包括动作传感器,并且其中所述无线客户端设备被配置为响应于所述动作传感器检测到的动作信号,从所述待机操作状态切换到所述活跃操作状态。
15.一种方法包括:
通过接入点识别所述接入点用于与无线客户端设备通信的第一无线通信信道,所述无线客户端设备具有活跃操作状态和待机操作状态;
检测所述第一无线通信信道上的干扰量;以及
响应于超过阈值的所述干扰量,当所述无线客户端设备处于所述活跃操作状态时,由所述接入点将所述无线客户端设备从所述第一无线通信信道引导到第二无线通信信道。
16.根据权利要求15所述的方法,进一步包括:
从所述无线客户端设备接收在所述无线客户端设备处检测到的所述第一无线通信信道上的所述干扰的测量值;以及
响应于所接收的超过所述阈值的所述干扰的测量值,由所述接入点将所述无线客户端设备从所述第一无线通信信道引导到所述第二无线通信信道。
17.根据权利要求15所述的方法,进一步包括:
通过使用机器学习模块,通过所述接入点产生在指定时间的对所述第一无线通信信道上的干扰量的预测;以及
响应于超过所述阈值的所预测的干扰,由所述接入点将所述无线客户端设备在所述指定时间之前从所述第一无线通信信道引导到所述第二无线通信信道。
18.一种方法,包括:
从与通过第一无线通信信道通信地耦合到接入点的无线客户端设备接收所述无线客户端设备检测到的所述第一无线通信信道上的干扰量;
将所述干扰量与阈值进行比较;以及
响应于超过所述阈值的所述干扰量,由所述接入点将所述无线客户端设备从所述第一无线通信信道引导到第二无线通信信道。
19.根据权利要求18所述的方法,其中所述无线客户端设备具有活跃操作状态和待机操作状态,并且其中所述接入点在所述无线客户端设备处于所述活跃操作状态时将所述无线客户端设备从所述第一无线通信信道引导到所述第二无线通信信道。
20.根据权利要求18所述的方法,进一步包括:
通过使用机器学习模块,通过所述接入点产生在指定时间的对所述第一无线通信信道的干扰量的预测;以及
响应于超过所述阈值的所预测的干扰,在所述指定时间之前通过所述接入点将所述无线客户端设备从所述第一无线通信信道引导到所述第二无线通信信道。
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