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公开(公告)号：US07353027B2
公开(公告)日：2008-04-01
申请号：US10084879
申请日：2001-10-18
IPC分类号： H04Q7/20
CPC分类号： H04W36/0011 , H04L45/00 , H04L67/04 , H04L69/16 , H04L69/167 , H04W8/085 , H04W36/02 , H04W80/04
摘要： In a system and method for handing off a mobile node in a seamless manner in a wireless access network, procedures are implemented for allowing the mobile node to synchronize the handoff with a base node (e.g., a home agent) and a correspondent node. In this way, a seamless handoff may be achieved, since few or no data packets sent between the base node or the correspondent node and the mobile node are lost. The procedures are supported by both Mobile IPv4 and Mobile IPv6 as well as Hierarchical Mobile IPv4 and Hierarchical Mobile IPv6.
摘要翻译： 在用于在无线接入网络中以无缝方式移交移动节点的系统和方法中，实现了允许移动节点将切换与基本节点（例如，归属代理）和通信节点同步的过程。 以这种方式，可以实现无缝切换，因为在基本节点或通信节点与移动节点之间传送的数据分组很少或没有丢失。 移动IPv4和移动IPv6以及分层移动IPv4和分层移动IPv6都支持这些过程。
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公开(公告)号：US5920548A
公开(公告)日：1999-07-06
申请号：US725655
申请日：1996-10-01
申请人： Karim El Malki
发明人： Karim El Malki
CPC分类号： H04B3/238
摘要： An echo cancellation apparatus (20) and method involves an operation AEPR for analyzing echo path response and thereafter an operation CR for configuring an adaptive FIR filter (52). The configuration of the adaptive filter (52) advantageously results in only a range of filter taps and coefficients between two specified tap endpoints being involved in filter multiplication, addition, and storage during the echo cancellation operation.
摘要翻译： 回波消除装置（20）和方法涉及用于分析回波路径响应的操作AEPR，此后包括用于配置自适应FIR滤波器（52）的操作CR。 自适应滤波器（52）的配置有利地仅导致在回波消除操作期间在滤波器乘法，相加和存储期间涉及两个指定抽头端点之间的滤波器抽头和系数的范围。
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公开(公告)号：US6044068A
公开(公告)日：2000-03-28
申请号：US725656
申请日：1996-10-01
申请人： Karim El Malki
发明人： Karim El Malki
CPC分类号： H04B3/234
摘要： An echo cancellation method and apparatus (20) determines whether a window W(m) of samples on an incoming communications path (30) contains silence, the window W(m) including the sample obtained at time t(m) and prior samples. If the window W(m) contains silence, coefficients of an adaptive filter (52) of the echo canceller (20) are set to silence detection values prior to receipt of a sample at time t(m+1). If the window W(m) does not contain silence and there is no double-talk, the sample obtained at time t(m) is used to update coefficients of the adaptive filter; the adaptive filter as updated generates an echo estimate after a sample is obtained at time t(m+1); and, the echo estimate is used to modify a signal on an outgoing communications path (32).
摘要翻译： 回波消除方法和装置（20）确定进入通信路径（30）上的样本的窗口W（m）是否包含静默，包括在时间t（m）和先前样本获得的样本的窗口W（m）。 如果窗口W（m）包含静音，则回波消除器（20）的自适应滤波器（52）的系数被设置为在时间t（m + 1）接收样本之前使静音检测值无效。 如果窗口W（m）不包含静音并且没有双方通话，则使用在时间t（m）获得的样本来更新自适应滤波器的系数; 在时间t（m + 1）获得样本之后，更新的自适应滤波器产生回波估计; 并且使用回波估计来修改输出通信路径（32）上的信号。
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