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    • 4. 发明申请
    • PROXY ACTIVE SCAN FOR WIRELESS NETWORKS
    • 代理无线网络的代理主动扫描
    • WO2005002116A3
    • 2005-05-26
    • PCT/US2004016236
    • 2004-05-20
    • DOCOMO COMM LAB USA INCJEONG MOO RYONGWATANABE FUJIOKAWAHARA TOSHIRO
    • JEONG MOO RYONGWATANABE FUJIOKAWAHARA TOSHIRO
    • H04L20060101H04W36/08H04W48/14H04W48/16H04W84/12H04W92/20H04Q7/24
    • H04W48/16H04W36/08H04W48/14H04W84/12H04W92/20
    • Active scanning method in a wireless network for fast determining available access points (106, 806) using inter-AP (Access Point) communication is described. In the scanning method, a mobile station (102, 802) sends Probe Request for Proxy frame to the current AP (104, 804) serving the mobile station (102, 802). In response to the Probe Request for Proxy frame, the current AP (104, 804) send Proxy Probe Request packet to the appropriate APs (106, 806). In response to the Proxy Probe Request packet, the neighbor APs (106, 806) send Probe Response frame to the mobile station (102, 802) on its operating channel. Since the mobile station (102, 802) moves to the channel being examined after sending the Probe Request for Proxy frame, it receives the Probe Response frame if it is in the coverage area of the neighbor AP (106, 806). The content of Probe Response frame provides the mobile station (102, 802) with the information to be used in handoff decision and network join procedures. Thus, the mobile station (102, 802) neither has to move to the channel to be examined nor send Probe Request frame on that channel. This enables active scan to be initiated even when the neighbor AP (106, 806) is operating in PCF (Point Coordination Function) and the network is in CFP (Contention Free Period), during which unassociated mobile stations (including the scanning mobile station) cannot send packets.
    • 描述了使用AP间(接入点)通信来快速确定可用接入点(106,806)的无线网络中的主动扫描方法。 在扫描方法中,移动台(102,802)向服务于移动台(102,802)的当前AP(104,804)发送针对代理帧的探测请求。 响应于探测请求代理帧,当前AP(104,804)将代理探测请求分组发送到适当的AP(106,806)。 响应于代理探测请求分组,邻居AP(106,806)在其操作信道上向移动台(102,802)发送探测响应帧。 由于移动台(102,802)在发送用于代理帧的探测请求之后移动到正在被检查的信道,因此如果它在邻居AP(106,806)的覆盖区域中,则它接收探测响应帧。 探测响应帧的内容向移动台(102,802)提供要在切换决定和网络加入过程中使用的信息。 因此,移动台(102,802)既不必移动到要检查的信道,也不必在该信道上发送探测请求帧。 这使得即使在邻居AP(106,806)在PCF(点协调功能)中操作并且网络处于CFP(无争用周期)中时也启动主动扫描,在此期间,未关联的移动台(包括扫描移动台) 不能发送数据包。
    • 9. 发明申请
    • METHOD AND APPARATUS FOR OPTIMAL ATIM SIZE SETUP FOR 802.11 NETWORKS IN AN AD HOC MODE
    • 用于802.11网络的最佳模式大小设置的方法和装置
    • WO2007081614A2
    • 2007-07-19
    • PCT/US2006061320
    • 2006-11-29
    • NTT DOCOMO INCGAO XIAJEONG MOO RYONGWATANABE FUJIO
    • GAO XIAJEONG MOO RYONGWATANABE FUJIO
    • G08C17/00
    • H04W52/0216H04W84/18Y02D70/00Y02D70/142Y02D70/22
    • A method for power saving in an ad hoc wireless computer network determines an optimal ATIM message exchange window. The method (a) determines an effective number of nodes that participate in exchanges of ATIM messages during an ATIM window; (b) using the effective number of nodes, calculating a length for a data frame transmission window; and (c) calculates a length for the ATIM window using the calculated data frame transmission window. In one instance, the method determines the effective number of nodes based on the number of senders of ATIM messages. In another instance, the effective number of nodes is determined based on both senders and recipients of the ATIM messages. The method may determine the effective number of nodes from a number of successful ATIM message transmissions in a given time period. The calculated ATIM window size can be provided as an initial value to other methods that dynamically adjust the ATIM window size.
    • 在自组织无线计算机网络中节电的方法确定最佳ATIM消息交换窗口。 方法(a)确定在ATIM窗口期间参与ATIM消息交换的节点的有效数量; (b)使用有效数量的节点,计算数据帧传输窗口的长度; 和(c)使用所计算的数据帧传输窗口计算ATIM窗口的长度。 在一种情况下,该方法基于ATIM消息的发送者的数量确定节点的有效数量。 在另一个实例中,基于ATIM消息的发送者和收件人来确定有效数量的节点。 该方法可以在给定时间段内从多个成功的ATIM消息传输确定节点的有效数量。 计算的ATIM窗口大小可以作为动态调整ATIM窗口大小的其他方法的初始值。