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    • 3. 发明授权
    • Collision reduction in a CSMA/CA system
    • CSMA / CA系统中的碰撞减少
    • US08743808B2
    • 2014-06-03
    • US13269823
    • 2011-10-10
    • James S. ChoShiwei Zhao
    • James S. ChoShiwei Zhao
    • H04W4/00
    • H04W74/085
    • Method for reducing collisions between a first station and a second station in a CSMA/CA system. The method may be performed by the first station. Medium access to transmit to the second station may be obtained according to a first procedure for obtaining medium access. It may be determined that the second station is configured to grant transmit opportunity to the first station. Medium access to transmit to the second station may be obtained according to a second procedure for obtaining medium access based on determining that the second station is configured to grant transmit opportunity to the first station. The first procedure may include contending for medium access, while the second procedure may include delaying contention for medium access relative to the first procedure.
    • 一种用于减少CSMA / CA系统中的第一站和第二站之间的冲突的方法。 该方法可以由第一站执行。 可以根据用于获得媒体访问的第一过程来获得向第二站发送的媒体访问。 可以确定第二站被配置为向第一站授予发送机会。 基于确定第二站被配置为向第一站授予发送机会,可以根据用于获得媒体接入的第二过程来获得向第二站发送的媒体接入。 第一过程可以包括竞争媒体访问,而第二过程可以包括延迟相对于第一过程的媒体访问的争用。
    • 5. 发明申请
    • LISTEN INTERVAL (LI) SELECTION FOR WLAN CLIENT
    • 无线局域网客户端的查询间隔(LI)选择
    • US20140036746A1
    • 2014-02-06
    • US13563157
    • 2012-07-31
    • Chaitanya MANNEMALAGuido Robert FREDERIKSSunit PUJARIAshok RANGANATH
    • Chaitanya MANNEMALAGuido Robert FREDERIKSSunit PUJARIAshok RANGANATH
    • H04W52/02
    • H04W52/0216H04W76/28Y02D70/142
    • The listen interval of a WLAN client is selected to have one of a plurality of values, including a start listen interval (SLI) and one or more longer listen intervals (e.g., transient listen interval (TLI), maximum listen interval (MLI)). The listen interval is set to SLI in response to (1) detecting that an applications processor of the WLAN client is in an awake state, (2) detecting transmit/receive activity on the wireless link, and (3) failing to detect an expected beacon signal on the wireless link. If the listen interval is set to MLI (or TLI) and the WLAN client fails to detect an expected beacon signal (beacon miss), the listen interval is temporarily set to SLI. If the WLAN client then detects an expected beacon signal before detecting a predetermined number of consecutive beacon misses, the listen interval is immediately returned to the original listen interval MLI (or TLI).
    • 选择WLAN客户端的监听间隔以具有多个值中的一个,包括开始监听间隔(SLI)和一个或多个更长监听间隔(例如,暂时监听间隔(TLI),最大监听间隔(MLI))) 。 响应于(1)检测到WLAN客户端的应用处理器处于唤醒状态,(2)检测无线链路上的发送/接收活动,并且(3)未能检测到预期的 信标信号在无线链路上。 如果监听间隔设置为MLI(或TLI),并且WLAN客户端无法检测到预期信标信号(信标未命中),则监听间隔将临时设置为SLI。 如果WLAN客户端在检测到预定数量的连续信标未命中之前检测到预期的信标信号,则监听间隔立即返回到原始监听间隔MLI(或TLI)。
    • 8. 发明申请
    • RTT BASED RANGING SYSTEM AND METHOD
    • 基于RTT的系统和方法
    • US20130336131A1
    • 2013-12-19
    • US13523457
    • 2012-06-14
    • Xiaoxin ZHANGNing Zhang
    • Xiaoxin ZHANGNing Zhang
    • H04W24/00
    • H04W24/00G01S13/765H04W64/00
    • A system and method are disclosed for performing ranging operations (700) between two or more wireless devices (STA1 and STA2). For some embodiments, the ranging operation allows each of a pair of ranging devices to estimate timing errors associated with measuring the time of arrival (TOA) of received signals, and to remove such timing errors from the measured TOA values. TOA and time of departure (TOD) information may also be exchanged between the devices using measurement action frames defined by IEEE 802.11v standards. In addition, an iterative process (800) is disclosed that allows a sequence of measurement action frames exchanged between the ranging devices to refine the timing errors and thus also refine the round trip time (RTT) value of signals exchanged between the devices.
    • 公开了用于在两个或多个无线设备(STA1和STA2)之间执行测距操作(700)的系统和方法。 对于一些实施例,测距操作允许一对测距装置中的每一个估计与测量接收信号的到达时间(TOA)相关联的定时误差,并且从测量的TOA值中去除这些定时误差。 也可以使用由IEEE 802.11v标准定义的测量动作帧在设备之间交换TOA和出发时间(TOD)信息。 此外,公开了一种迭代过程(800),其允许在测距设备之间交换的测量动作帧序列来细化定时误差,并且因此还改善在设备之间交换的信号的往返时间(RTT)值。