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    • 3. 发明申请
    • SYSTEM AND METHOD FOR DTX FRAME DETECTION
    • 用于DTX帧检测的系统和方法
    • WO0203588A3
    • 2002-06-20
    • PCT/US0120819
    • 2001-06-28
    • QUALCOMM INC
    • GLAZKO SERGUEIACHOUR BAAZIZLIN YU-CHUAN
    • H04B7/26H04J3/14H04J3/17H04L1/20H04Q7/38
    • H04L1/20H04J3/14H04J3/17H04L1/201
    • A system and method for dectecting discontinuous transmission (DTX) frames. The inventive method includes the steps of receiving data transmitted in a pluralitz of frames (62); classifzing each of the frames (63); analyzing the classification of a number of successive frames of the received data and providing a metric with respect thereto; and determining, in response to the metric, if a frame is a discontinuous frame (66). In the illustrative embodiment, the step of classifzing includes the step of error checking the frames using a cyclic redundancz check (CRC) error checking protocol. The received frames are classified as good frames (G), erasureframes (E), or discontinuous frames (D). A numerical value is assigned toe ach of the frames based on the classification thereof. Next, the frames are filtered tp provice an output Yn=Yn-1+Xn where 'n' is a frame number, Yn is the filter output for a given frame n, Yn-1 is the filter output for a previous frame, and Xn is a stream of input frames. A threshold is set for the output Yn to facilitate the detection of discontinuous frames. That is, a detection of a discontinuous transmisson frame is indicated when a frame is classified as an 'erasure' and the filter output exceeds the threshold. On the detection of a discontinuous frame, the classification of the frame is changed from 'erasure' to 'discontinuous'. By reclassifying improperly classified erasure frames, the mobile receiver is inhibited from requesting retransmission of the frames of a change in the transmit power level. Consequently, network throughput and capacity are optimized and system power is conserved.
    • 一种用于检测不连续传输(DTX)帧的系统和方法。 本发明的方法包括以下步骤:接收以多个帧(62)发送的数据; 分类每个帧(63); 分析接收到的数据的多个连续帧的分类并提供关于其的度量; 以及响应于该度量确定帧是否是不连续帧(66)。 在说明性实施例中,分类步骤包括使用循环冗余校验(CRC)错误校验协议来错误检查帧的步骤。 接收的帧被分类为好帧(G),擦除帧(E)或不连续帧(D)。 基于其分类将数值分配给多个帧。 接下来,对帧进行滤波,以提供输出Y n = Y n-1 + X n,其中'n'是帧号,Y n是给定帧n的滤波器输出,Y n-1是前一帧的滤波器输出, Xn是输入帧的流。 为输出Yn设置阈值以便于检测不连续的帧。 也就是说,当帧被分类为“擦除”并且滤波器输出超过阈值时,指示不连续传输帧的检测。 在检测到不连续的帧时,帧的分类从“擦除”变为“不连续”。 通过重新分类不正确分类的擦除帧,禁止移动接收机请求重发发射功率电平变化的帧。 因此,网络吞吐量和容量得到优化,系统功率得到节约。