CN101399676B - 无线局域网中通过可变监听间隔的节电 - Google Patents

无线局域网中通过可变监听间隔的节电 Download PDF

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CN101399676B
CN101399676B CN2008100989795A CN200810098979A CN101399676B CN 101399676 B CN101399676 B CN 101399676B CN 2008100989795 A CN2008100989795 A CN 2008100989795A CN 200810098979 A CN200810098979 A CN 200810098979A CN 101399676 B CN101399676 B CN 101399676B
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client device
access point
wireless client
listening intervals
parameter
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CN101399676A (zh
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詹姆斯·王
汤姆·纳吉
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Xircom Research Co ltd
BlackBerry Ltd
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Xircom Research Co ltd
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    • H—ELECTRICITY
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
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    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
    • H04N21/43072—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of multiple content streams on the same device
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Abstract

本发明提供了无线局域网中通过可变监听间隔的节电。接入点(102)将接收到的广播或组播业务作为单播业务的多个实例来处理，其中每个实例以与所述接入点(102)相关联的对应无线客户端设备(120、122、124、126、128、130、400)为目的地。客户端设备(400)可以根据预定考虑来调整其监听间隔参数，例如为客户端设备(400)供电的电池(420)的充电水平和/或设备(400)的期望使用模型。客户端设备(400)可以发起重新关联请求，将其调整后的监听间隔参数通知给接入点(102)。

Description

无线局域网中通过可变监听间隔的节电
本申请是2005年12月29日提交的中国专利申请No.2005101381232“在无线网络中作为单播业务来处理广播和组播业务”的分案申请。
技术领域
本发明大体上涉及无线网络。具体地，本发明的实施例涉及无线网络中的一个或多个客户端设备的节能。
背景技术
无线接入点(AP)是将无线设备“连接”在一起以创建无线网络的设备。被称为“客户端设备”的无线设备彼此进行通信或通过AP与其他网络进行通信。
客户端设备可以是或者不是电池供电的。例如，如无线启用(enabled)膝上型计算机、无线启用蜂窝电话、无线启用个人数字助理(PDA)等客户端设备有时是电池供电的，而在其他时候可以接收来自如电源插座等外部源的电能。如桌面计算机系统等其他客户端设备可以接收来自如电源插座等外部源的电能，并且不具有电池供电的选项。
提高电池供电客户端设备的电池寿命是有利的。
发明内容
接入点将接收到的广播或组播业务作为单播业务的多个实例(instance)来处理，其中每个实例以与接入点相关联的对应无线客户端设备为目的地。
在一个实施例中，接入点不再在传递业务指示消息(DTIM)中指示广播或组播业务的存在，且不再在DTIM之后发射广播或组播业务。在此实施例中，将影响与接入点相关联的所有客户端设备。
在可选实施例中，除了作为单播业务的多个实例来传送广播或组播业务之外，接入点将继续在DTIM中指示广播或组播业务的存在，并在DTIM之后发射广播或组播业务。在此可选实施例中，只会影响具有被设置为假的接收DTIM参数的那些客户端设备。
客户端设备可以根据预定考虑调整其监听间隔参数，例如为客户端设备供电的电池的充电水平以及所述设备的期望使用模型。客户端设备可以发起重新关联请求，将其调整后的监听间隔参数通知给接入点。
附图说明
将作为非限制性示例、参照附图，描述本发明的实施例，在附图中相似的参考数字表示对应的、类似的或相似的元件，其中：
图1是根据本发明实施例的、典型通信系统的图示；
图2是有助于理解本发明实施例的、信标帧的典型序列的图示；
图3是根据本发明实施例的、典型接入点的方框图；以及
图4是根据本发明实施例的、典型无线客户端设备的方框图。
应当清楚，为了图示的简单和清楚，图中所示的元件并非按照比例绘制。例如，为了清楚，可能相对于其他元件，夸大了一些元件的尺寸。
具体实施方式
在以下的详细描述中，为了提供对本发明实施例的透彻理解，阐述了大量的具体细节。但是，本领域普通技术人员应当理解，可以实现本发明的实施例，而无需这些具体细节。在其他示例中，并未详细描述公知的方法、过程、组件和电路，以防止其使本发明的实施例不清楚。
图1是根据本发明实施例的典型通信系统100的图示。系统100包括无线接入点(AP)102和分别通过有线连接108和110与AP 102相连的网关104和106。网关104和106、有线连接108和110可以是针对AP 102的“分布系统”的一部分。网关104和106的非限制示例有线缆调制解调器、非对称数字订户线(ADSL)调制解调器、异步传输模式(ATM)网关、拨号调制解调器、卫星调制解调器、综合服务数字网络(ISDN)网关、T-载波1(T1)调制解调器等。应当清楚，针对AP 102的分布系统的任何其他配置是可能的。系统100还包括通过有线连接114与网关104相连的桌面计算机或服务器112。
AP 102具有至少一个天线116，并可配置用于支持至少一个无线网络名称，例如至少一个服务集标识符(SSID)。天线116的示例的非穷尽列表包括双极天线、单极天线、多层陶瓷天线、平面倒F天线、环路天线、shot天线、双天线、全向天线和任何其他合适的天线。AP102可以包括路由器。
典型的通信系统100包括无线启用膝上型计算机120和122、无线启用蜂窝电话124和126以及无线启用个人数字助理(PDA)128和130。无线启用膝上型计算机120和122、无线启用蜂窝电话124和126以及无线启用PDA 128和130中的每一个均能执行将其自身在无线网络中与AP 102相关联的初始化处理。
例如，无线启用膝上型计算机120和122、无线启用蜂窝电话124和126以及无线启用PDA 128和130可以通过无线网络118与AP 102相关联。将无线启用膝上型计算机120和122、蜂窝电话124和126以及PDA 128和130称为“客户端设备”。
图1所示的客户端设备只是示例，其他合适的客户端设备和客户端设备分组也是可能的。客户端设备的示例的非穷尽列表包括工作站、服务器计算机、笔记本计算机、膝上型计算机、桌面个人计算机(PC)、个人数字助理(PDA)计算机、手持计算机、无线局域网(WLAN)固定单元、WLAN附件卡、WLAN个人计算机存储卡国际协会(PCMICIA)卡、WLAN PC卡、WLAN交换机、WLAN路由器、WLAN服务器、游戏控制台、数字照相机、数字摄像机、电视机、无线因特网协议(IP)电话等。
在此示例中，AP 102和客户端设备均为“802.11-启用”的，这意味着其间的无线通信符合由电气和电子工程师协会(IEEE)针对无线LAN MAC和物理层(PHY)规范而定义的以下标准中的一个或多个：
  标准   公开   最大速度   频率
  802.11   1997   2Mbps   2.4GHz
  802.11a   1999   54Mbps   5.0GHz
  802.11b   1999   11Mbps   2.4GHz
  802.11g   2003   54Mbps   2.4GHz
但是，对于本领域普通技术人员，如何修改以下内容以用于其他现有WLAN标准或未来的相关标准(包括802.11n)是显而易见的。
802.11标准的1999版(2003年6月12日重新审定)区分了基础结构WLAN和特设(ad-hoc)WLAN。以下描述是针对基础结构WLAN的，涉及对接入点的使用。
802.11标准规定：接入点以实质上有规律的时间周期发射信标帧，以宣布它的存在和同步无线网络。将目标信标传输时间之间的时间量称为“信标间隔”。在802.11标准中详细地解释了信标帧的格式及其内容。信标间隔包括在每个信标帧中。
每个信标帧还包括时间戳，作为信标的实际传输时刻、接入点内部的时钟值。由于使用了带有冲突检测的载波侦听多路存取(CSMA/CD)技术，实际传输时间可能会晚于目标信标传输时间。结果，直到实际传输发生之前，并未填充信标帧的时间戳字段。接收信标帧的客户端设备将根据接收到的信标帧中的时间戳来更新其内部时钟。
每个信标帧还包括业务指示映射(TIM)，用于识别为其单播业务进行等待且在接入点中缓冲单播业务的客户端设备。此信息按照部分虚拟位图进行编码。TIM还包括是广播还是组播业务正在等待的指示。
存在两种不同的TIM类型：TIM和传递TIM(DTIM)。TIM包括“DTIM计数”字段，指示在下一个DTIM之前出现多少个信标帧(包括当前帧)。DTIM计数为零表示当前的TIM是DTIM。“DTIM周期”字段表示连续DTIM之间的信标间隔数。每个DTIM周期，在信标内传输“DTIM”类型的TIM，而不是普通的TIM。在DTIM之后，接入点在传输任何单播帧之前，利用正常的帧传输规则，发送出缓冲广播或组播业务。
客户端设备可以处于两种不同的功率状态：“清醒”-为客户端设备完全供电；以及“休眠”-客户端设备不能发射或接收，并且消耗非常低的功率。客户端设备在这两种功率状态之间过渡的方式由客户端设备的功率管理模式来确定。在“有效(active)模式”下，客户端可以随时接收帧，并且处于“清醒”状态。在“节能模式”下，客户端设备监听所选择的信标帧(根据客户端设备的“监听间隔”参数)，以及如果最近信标帧中的TIM元素指示针对该客户端设备的缓冲单播业务，向接入点发送“节能轮询(PS-轮询)”帧。
在节能模式下，客户端设备处于休眠状态，并且进入清醒状态来接收所选择的信标、接收跟随在特定的接收信标之后的广播和组播传输、传输、以及等待对已传输的PS-轮询帧的响应或者(针对CF-可轮询客户端设备)接收缓冲业务的无竞争传输。
接入点维护每个当前关联客户端设备的功率管理状态，指示客户端设备当前进行操作的功率管理模式。根据站点的功率管理模式，接入点暂时缓冲以客户端设备为目的地的业务。接入点只响应于来自客户端设备的PS-轮询或在处于节能模式下的CF-可轮询客户端设备的情况下、在无竞争(CF)周期期间，向处于节能模式的客户端设备传输缓冲单播业务。
客户端设备的“监听间隔”参数规定了在客户端设备醒来并监听下一信标帧之前可以经过的最大信标间隔数。客户端设备在与接入点关联期间，将其“监听间隔”参数通知给接入点。例如，此参数可以由客户端设备所需的功率消耗/性能目标来确定。
接入点具有老化功能(aging function)，在业务被缓冲过量的时间周期时删除缓冲业务。老化功能基于“监听间隔”参数，将缓冲业务保持至少与信标间隔与为其而缓冲业务的客户端设备的“监听间隔”参数的乘积一样长的周期。
客户端设备还具有布尔参数，名称为“接收DTIM”，在客户端设备将客户端设备的功率管理模式的改变通知给接入点时设置。当“接收DTIM”参数为真时，客户端设备醒来以接收包括DTIM的所有信标帧。当参数为假时，不需要针对包括DTIM的每个信标帧，唤醒客户端设备。
在题目为“Power management in an infrastructure network”的802.11标准中给出了在竞争周期和无竞争周期期间、接入点和客户端设备的功率管理操作的细节。
特定客户端设备的“监听间隔”参数影响该客厅客户端设备与单播业务有关的节能行为，以及接入点的“DTIM周期”和客户端设备的“接收DTIM”参数影响无线网络中的所有客户端设备与广播和组播业务有关的节能行为。
无线网络中的客户端设备可能在处于节能模式时，具有针对功率消耗和通信吞吐量的冲突要求。此外，在电池供电客户端设备中对节能的需求可能会随着时间的过去增加电池泄漏，忽略了电池供电客户端设备的通信吞吐量考虑。
目前，接入点只能存储单一的DTIM周期。因此，将针对相同的信标帧，根据单一的DTIM周期，唤醒全部处于节能模式的不同客户端设备。目前，网络管理商需要在配置接入点的DTIM周期时、平衡客户端设备处于节能模式时的功率消耗和通信吞吐量的冲突需求。
目前，将根据与之相关联的接入点的DTIM周期来唤醒其“接收DTIM”参数被设置为真并处于节能模式的客户端设备，以便监听DTIM，并确定是否保持清醒以接收广播或组播业务。相同的客户端设备还将在由其“监听间隔”参数确定的周期内被唤醒，以监听TIM，并确定是否保持清醒以发出针对缓冲单播业务的PS-轮询帧。
每个客户端设备具有惟一的硬件地址，例如媒体接入控制(MAC)地址等，并由可以嵌入在接入点中的动态主机配置协议(DHCP)服务器为其分配因特网协议(IP)地址。或者，可以静态地配置客户端设备的IP地址。此外，接入点将“关联标识符(AID)”分配给与之关联的客户端设备，并保持AID与MAC地址之间的映射。接入点通过设置与适当的AID相对应的TIM的部分虚拟位图中的比特来标识为其缓冲了单播业务的那些客户端设备。此外，接入点保持地址解析协议(ARP)表，该表包含有因特网协议(IP)地址与MAC地址之间的映射。
网关可以从外部网络接收一个或多个信息帧，以向与特定IP地址相关联的网络设备转发。网关必须解析与特定IP地址相关联的网络设备的MAC地址，并向该网络设备发送信息帧。网关可以产生ARP请求，并将其发送给多个网络设备，包括接入点，这些网络设备将其看作广播业务。具有特定IP地址的网络设备(或与接入点相关联的客户端设备)可以用其MAC地址来响应ARP请求。
根据本发明的实施例，AP 102可以将接收到的广播或组播业务作为单播业务的多个实例(instance)来处理，其中每个实例以与AP 102相关联的对应客户端设备为目的地。AP 102将在TIM中指示以处于节能模式的客户端设备为目的地的每个实例的存在。这种指示将在随后的TIM中重复，直到AP 102的老化功能已经使该实例被丢弃或者直到客户端设备已经发出了PS-轮询帧或者已经在缓冲业务的无竞争传输中接收到该实例，无论哪一个先到来。
AP 102不再在DTIM中指示广播或组播业务的存在，且不再在DTIM之后发射广播或组播业务。因此，本实施例将影响与AP 102相关联的所有客户端设备。或者，除了作为单播业务的多个实例来传送广播或组播业务之外，AP 102继续在DTIM中指示广播或组播业务的存在，并在DTIM之后发射广播或组播业务。在可选实施例中，只会影响具有被设置为假的“接收DTIM”参数的那些客户端设备。
图2是根据本发明实施例、由AP 102发射的典型信标帧序列的图示。每个信标帧200包括TIM，并且例如，如果AP 102的DTIM周期是3，则每隔两个信标帧，TIM是DTIM。
例如，膝上型计算机122、蜂窝电话126和PDA 128和130可以处于节能模式，“监听间隔”参数分别为4、8、8和6。
例如，如果AP 102接收到位于信标帧202之前的ARP请求201，AP 102将作为单播业务的多个实例来处理广播业务，其中实例以与AP 102相关联的对应无线客户端设备为目的地。由于膝上型计算机120和蜂窝电话124处于有效模式，AP 102将尽可能快地向膝上型计算机120和蜂窝电话124传送ARP请求。AP 102将针对处于节能模式的每个客户端设备，缓冲ARP请求201。
然后，AP 102将在随后信标帧的TIM中包括对此缓冲“单播”数据的指示。例如，AP 102将在信标帧202的TIM中包括为膝上型计算机122、蜂窝电话126和PDA 128和130缓冲了单播数据的指示。可以将膝上型计算机122从节能模式中唤醒，以监听信标帧202的TIM，并识别出缓冲了单播数据，并可以作为响应，向AP 102发送PS-轮询帧204。然后，AP 102可以向膝上型计算机122传送ARP请求201。
然后，AP 102将在信标帧206的TIM中包括为蜂窝电话126和PDA 128和130缓冲了单播数据的指示。可以将PDA 130从节能模式中唤醒，以监听信标帧206的TIM，并识别出缓冲了单播数据，并可以作为响应，向AP 102发送PS-轮询帧208。然后，AP 102可以向PDA130传送ARP请求201。
然后，AP 102将在信标帧210、212、214、216和218的TIM中包括为蜂窝电话126和PDA 128缓冲了单播数据的指示。可以将蜂窝电话126和PDA 128从节能模式中唤醒，以监听信标帧218的TIM，并识别出缓冲了单播数据，并可以作为响应，分别向AP 102发送PS-轮询帧220和222。然后，AP 102可以在向PDA 128传送了ARP请求201之后，向蜂窝电话126传送ARP请求201。
图3是根据本发明实施例的典型接入点的方框图。AP 102包括与无线电装置302相连的至少一个天线116，无线电装置302与具有基带功能的处理器304相连。处理器304的示例的非穷尽列表包括中央处理单元(CPU)、数字信号处理器(DSP)、精简指令集计算机(RISC)、复杂指令集计算机(CISC)等。此外，处理器304可以是专用集成电路(ASIC)的一部分，或者可以是专用标准产品(ASSP)的一部分。
AP 102还包括与有线网络控制器308相连的有线网络接口306。例如，有线网络可以是以太网、信令环、通用串行总线(USB)、符合IEEE 1394-1995、IEEE 1394a-2000和IEEE 1394b标准(通常称为“火线”)的有线网络或其任意组合。有线网络接口306能够使用有线连接108和110。
无线电装置302和处理器304可以是相同集成电路的一部分或位于分离的集成电路中。类似地，处理器304和有线网络控制器308可以是相同集成电路的一部分或位于分离的集成电路中。
AP 102还包括存储器310，可以固定在AP 102中，或可以从AP102上拆除。存储器310可以与处理器304相连，或部分嵌入在处理器304中。存储器310的示例的非穷尽列表包括以下器件的任意组合：
a)半导体器件，如寄存器、锁存器、只读存储器(ROM)、掩膜型ROM、电可擦可编程只读存储器(EEPROM)、闪速存储器、非易失性随机存取存储器(NVRAM)、同步动态随机存取存储器(SDRAM)、RAMBUS动态随机存取存储器(RDRAM)、双倍数据率(DDR)存储器、静态随机存取存储器(SRAM)、通用串行总线(USB)移动存储器等；
b)光学器件，如紧致盘只读存储器(CD ROM)等；以及
c)磁器件，如硬盘、软盘、磁带等。
处理器304和有线网络控制器308可以通过信号311相连，以协调其动作，例如对存储器310的存取。
存储器310可以存储与AP 102相关联的客户端设备的MAC地址与相应IP地址之间的映射312，以及与AP 102相关联的客户端设备的MAC地址与相应AID之间的映射314。或者，可以将这些映射中的一部分或全部存储在处理器304的内部。例如，蜂窝电话126可以具有AID＝1，PDA 130可以具有AID＝2，PDA 128可以具有AID＝3，膝上型计算机122可以具有AID＝4，蜂窝电话124可以具有AID＝5，以及膝上型计算机120可以具有AID＝6。
存储器310还可以包括缓冲系统318，用于存储以客户端设备为目的地的输入业务。例如，可以在有线网络控制器308的控制信号322下，将输入业务的数据320传送到缓冲系统318。
缓冲系统318已经包括了用于存储每个客户端设备的单播业务的缓冲器。
在一个实施例中，AP 102简单地将接收到的广播或组播业务复制到将要接收此业务的每个客户端设备的缓冲器中。
在另一实施例中，AP 102可以维护每个关联客户端设备的列表(例如，按照AID进行索引)。AP 102可以在接收到广播或组播数据时分配缓冲器，并且可以在针对作为接收数据的目的地的、处于节能模式的每个客户端设备的列表中包括对已分配缓冲器的指针(或对已分配缓冲器的任何其他合适指示)。每个这种已分配缓冲器与被设置为处于节能模式的客户端设备的总数(作为接收广播或组播数据的目的地)的计数器相关联。每次向一个客户端设备发送缓冲数据时，递减计数器。当计数器为零时，AP 102能够自由地解除对已分配缓冲器的分配，并丢弃缓冲数据。
例如，当AP 102在信标帧202之前接收到ARP请求201(图2)时，AP 102可以分配缓冲器A来存储ARP请求201。AP 102可以将与缓冲器A相关联的计数器324设置为数值4，该数值为目前处于节能模式的客户端设备的总数。AP 102将在AID 1、2、3和4(分别对应于蜂窝电话126、PDA 130、PDA 128和膝上型计算机122，均处于节能模式)的列表中包括对缓冲器A的指针(或对缓冲器A的任何其他合适指示)。
当AP 102已经(在膝上型计算机122响应于信标帧202的PS-轮询帧之后)向膝上型计算机122传送ARP请求201时，从AID 4的列表中去除对缓冲器A的指针，并将计数器324减1。
当AP 102已经(在PDA 130响应于信标帧206的PS-轮询帧之后)向PDA 130传送ARP请求201时，从AID 2的列表中去除对缓冲器A的指针，并将计数器324减1。
当AP 102已经(在蜂窝电话126响应于信标帧218的PS-轮询帧之后)向蜂窝电话126传送ARP请求201，以及(在PDA 128响应于信标帧218的PS-轮询帧之后)向PDA 128传送ARP请求201时，从AID 1和3的列表中去除对缓冲器A的指针，并将计数器324减2。
处理器304可以通过以数据信号330和控制信号332访问缓冲系统318，将接收到的广播或组播业务作为多个单播业务实例来处理，其中每个实例以与AP 102相关联的对应无线客户端设备为目的地。
图4是根据本发明实施例的、典型客户端设备的方框图。无线客户端设备400包括与无线电装置402相连的至少一个天线401，无线电装置402与具有基带功能的处理器404相连。处理器404的示例的非穷尽列表包括中央处理单元(CPU)、数字信号处理器(DSP)、精简指令集计算机(RISC)、复杂指令集计算机(CISC)等。此外，处理器304可以是专用集成电路(ASIC)的一部分，或者可以是专用标准产品(ASSP)的一部分。无线电装置402和处理器404可以是相同集成电路的一部分或位于分离的集成电路中。
客户端设备400还包括存储器410，可以固定在客户端设备400中，或可以从客户端设备400上拆除。存储器410可以与处理器404相连，或部分嵌入在处理器404中。存储器410的示例的非穷尽列表包括以下器件的任意组合：
a)半导体器件，如寄存器、锁存器、只读存储器(ROM)、掩膜型ROM、电可擦可编程只读存储器(EEPROM)、闪速存储器、非易失性随机存取存储器(NVRAM)、同步动态随机存取存储器(SDRAM)、RAMBUS动态随机存取存储器(RDRAM)、双倍数据率(DDR)存储器、静态随机存取存储器(SRAM)、通用串行总线(USB)移动存储器等；
b)光学器件，如紧致盘只读存储器(CD ROM)等；以及
c)磁器件，如硬盘、软盘、磁带等。
处理器404可以通过数据信号430和控制信号432访问存储在存储器410中的数据。存储器410可以存储对其“监听间隔”参数的指示。存储器410可以存储“监听间隔”参数的缺省硬代码值。“监听间隔”参数可以由客户端设备400的用户配置。
处理器404可以根据预定的考虑来调整“监听间隔”参数。这些考虑的非穷尽示例列表包括：
a)为客户端设备供电的电池420的充电水平(例如，在充电水平下降时，增加优选DTIM周期)；
b)客户端设备的期望使用模型；以及
c)网络参数(例如，在接收到对ARP请求的响应之后，网关是否记住了IP地址-MAC地址映射？)。
处理器404可以发起重新关联请求，以向AP 102声明此调整后的“监听间隔”参数。
如果客户端设备将其“接收DTIM”参数设置为假，则处于节能模式，并不根据DTIM周期，针对DTIM而唤醒客户端设备，而是在由“监听间隔”和信标帧的乘积所定义的周期内唤醒客户端设备来监听TIM。如果客户端设备具有大于AP 102的DTIM周期的“监听间隔”参数，则在本发明的实施例中，客户端设备将增加其节能潜力，同时保持了接收广播和组播业务的能力。这种节能潜力的增加与以下客户端设备形成鲜明对比，其“接收DTIM”参数被设置为真，并且与缓冲了针对处于节能模式的客户端的广播或组播业务的接入点相关联，在DTIM中表明缓冲广播或组播业务的存在，并在DTIM之后，传送缓冲广播或组播业务，而并未将广播或组播业务作为单播业务的多个实例来处理。
为了使用本发明的一些实施例，客户端设备可以识别出该设备与之相关联的接入点将接收到的广播和组播业务作为单播业务的多个实例来处理，其中实例以与接入点相关联的对应无线客户端设备为目的地。客户端设备可以在进入节能模式时将其“接收DTIM”参数设置为假。
可以将客户端设备手动或自动配置为使用此行为。例如，可以通过选项屏幕或客户端设备的配置文件等来实现手动配置。可以通过将适当的配置推入客户端设备来实现自动配置，例如通过空中策略管理(over-the-air policy management)或通过将客户端设备与计算机相连，并通过该连接加载配置信息。可以通过与接入点之间的通信来实现自动配置。例如，客户端设备可以等待要作为单播消息或广播消息发送的ARP，然后在接入点将继续按照相同的方式传送广播业务的假设下，适当地配置其“接收DTIM”参数。在另一示例中，接入点可以在一个下行帧中发送特定的标志，表示其倾向于继续这种无广播连接模式。在另一实施例中，客户端设备可以向接入点查询其对广播和组播业务的处理。
尽管这里已经图示和描述了本发明的特定特征，本领域普通技术人员应当清楚多种修改、替换、改变和等价物。因此，应当理解的是所附权利要求倾向于覆盖落入本发明的精神内的全部这种修改和改变。

Claims (8)

1.一种用于增加无线客户端设备(120、122、124、126、128、130、400)的节电潜能的方法，在具有监听间隔参数的值的关联中，所述设备与接入点(102)关联，所述方法包括：
根据预定考虑，确定所述监听间隔参数的不同值；以及
向所述接入点(102)声明所述监听间隔参数的所述不同值，
其中所述监听间隔参数规定了在将所述无线客户端设备(120、122、124、126、128、130、400)从节能模式中唤醒以监听来自接入点(102)的下一信标帧之前所能经过的信标间隔数。
2.根据权利要求1所述的方法，其中声明所述不同值包括：
发起重新关联请求，向所述接入点(102)声明所述监听间隔参数的所述不同值。
3.根据权利要求1或2所述的方法，其中所述预定考虑包括为所述无线客户端设备(120、122、124、126、128、130、400)供电的电池的充电水平和/或所述无线客户端设备(120、122、124、126、128、130、400)的期望使用模型。
4.一种无线客户端设备(120、122、124、126、128、130、400)，包括：
存储器(410)，用于存储监听间隔参数，所述监听间隔参数规定了在将所述无线客户端设备(120、122、124、126、128、130、400)从节能模式中唤醒以监听来自接入点(102)的下一信标帧之前所能经过的信标间隔数；以及
无线电装置(402)，在具有所述监听间隔参数的所述值的关联中，所述无线客户端设备(120、122、124、126、128、130、400)通过所述无线电装置与接入点(102)关联；以及
处理器(404)，用于根据预定考虑，确定所述监听间隔参数的不同值，并且通过所述无线电装置(402)向所述接入点(102)声明所述监听间隔参数的所述不同值。
5.根据权利要求4所述的无线客户端设备(120、122、124、126、128、130、400)，其中所述处理器(404)设置用于发起重新关联请求，向所述接入点(102)声明所述监听间隔参数的所述不同值。
6.根据权利要求4或5所述的无线客户端设备(120、122、124、126、128、130、400)，其中所述预定考虑包括为所述无线客户端设备(120、122、124、126、128、130、400)供电的电池的充电水平和/或所述无线客户端设备(120、122、124、126、128、130、400)的期望使用模型。
7.根据权利要求4或5所述的无线客户端设备(120、122、124、126、128、130、400)，其中所述接入点采用IEEE 802.11无线局域网标准。
8.一种无线通信系统，包括接入点(102)和至少一个根据权利要求4或5所述的无线客户端设备(120、122、124、126、128、130、400)。
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