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    • 10. 发明申请
    • CONTROL FRAME FEATURE ON DEMAND IN A WIRELESS COMMUNICATION SYSTEM
    • 无线通信系统中的控制帧需求
    • WO2008076516A2
    • 2008-06-26
    • PCT/US2007/082420
    • 2007-10-24
    • MOTOROLA, INC.CHEN, YeVUKOVIC, Ivan, N.
    • CHEN, YeVUKOVIC, Ivan, N.
    • H04L12/28
    • H04W74/0816H04L43/16
    • In a wireless network, a device monitors (310) at least one parameter that indicates collision status in the network; compares (320) the at least one parameter to a predefined control frame threshold that is based on a criterion other than packet-size; and activates (330) a control frame feature in the device for sending a control frame prior to data transmission, when the at least one parameter exceeds the control frame threshold. In an 802.11 network, the control frames are RTS (request-to-send) and CTS (clear-to-send) frames. The parameters being monitored can include: a number of acknowledgement and RTS frames detected from a hidden terminal, when the device is in a backoff state; a number of retransmission attempts by the device; and a collision rate determined and transmitted by another device in the wireless network to which the device intends to send data.
    • 在无线网络中,设备监视(310)指示网络中的冲突状态的至少一个参数; 将所述至少一个参数(320)与基于除了分组大小之外的准则的预定义控制帧阈值进行比较(320) 并且当所述至少一个参数超过所述控制帧阈值时,激活(330)所述设备中的控制帧特征以发送数据传输之前的控制帧。 在802.11网络中,控制帧是RTS(请求发送)和CTS(清除发送)帧。 所监视的参数可以包括:当设备处于退避状态时,从隐藏终端检测到的许多确认和RTS帧; 设备的多次重传尝试; 以及由设备想要发送数据的无线网络中的另一设备确定和发送的冲突率。