DISCONTINUOUS TRANSMISSION (DTX) FRAME DETECTION IN WIRELESS COMMUNICATION SYSTEMS
    36.
    发明授权
    DISCONTINUOUS TRANSMISSION (DTX) FRAME DETECTION IN WIRELESS COMMUNICATION SYSTEMS 有权
    无线通信系统中的非连续传输(DTX)帧检测

    公开(公告)号:EP1570699B1

    公开(公告)日:2007-08-22

    申请号:EP03796971.4

    申请日:2003-12-10

    CPC classification number: H04L1/0061 H04L1/0072 H04L1/20 H04L1/201

    Abstract: Techniques to detect for DTX frames in a 'primary' transmission that may be sent in a non-continuous manner using a 'secondary' transmission that is sent during periods of no transmission for the primary transmission. The primary and secondary transmissions may be the ones sent on the F-DCCH and Forward Power Control Subchannel, respectively, in an IS-2000 system. In one method, a determination is first made whether or not a frame received for the primary transmission in a particular frame interval is a good frame (e.g., based on CRC). If the received frame is not a good frame, then a determination is next made whether the received frame is a DTX frame or an erased frame based on a number of metrics determined for the primary and secondary transmissions. The metrics may include symbol error rate of the received frame, secondary transmission (e.g., PC bit) energy, and received frame energy.

    Abstract translation: 用于检测“主”传输中的DTX帧的技术,其可以使用在主传输的无传输期间发送的“次要”传输以非连续方式发送。 主要和次要传输可以是在IS-2000系统中分别在F-DCCH和前向功率控制子信道上发送的传输。 在一种方法中,首先确定在特定帧间隔内针对主传输接收到的帧是否是好帧(例如,基于CRC)。 如果接收到的帧不是好的帧,则基于为主要传输和次要传输确定的多个度量来确定接收到的帧是DTX帧还是擦除帧。 度量可以包括所接收的帧的符号错误率,二次传输(例如PC比特)能量和接收到的帧能量。

    METHOD FOR PERFORMING A CANDIDATE FREQUENCY SEARCH IN A WIRELESS COMMUNICATION SYSTEM
    37.
    发明授权
    METHOD FOR PERFORMING A CANDIDATE FREQUENCY SEARCH IN A WIRELESS COMMUNICATION SYSTEM 有权
    方法用于进行候选频率搜索在无线通信系统

    公开(公告)号:EP1321009B1

    公开(公告)日:2007-01-03

    申请号:EP01973609.9

    申请日:2001-09-27

    CPC classification number: H04W36/0088

    Abstract: A method and apparatus for decreasing the probability of dropping a call during a hard handoff procedure in a wireless communication system (FIG. 1). The two primary functions of the candidature frequency (CF) search method and apparatus of the present invention are to detect the strong pilots (908-916) on a candidate frequency in the area of the mobile station and to maintain adequate service quality during the CF search (FIG. 8).

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