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    • 1. 发明申请
    • SYSTEM AND METHOD FOR RE-SYNCHRONIZATION OF A PSS SESSION TO AN MBMS SESSION
    • PSS会话与MBMS会话重新同步的系统和方法
    • WO2009053899A2
    • 2009-04-30
    • PCT/IB2008/054322
    • 2008-10-21
    • NOKIA CORPORATIONNOKIA INCKONDRAD, LukaszBOUAZIZI, Imed
    • KONDRAD, LukaszBOUAZIZI, Imed
    • H04L65/4076H04L65/608H04L65/80
    • An accurate indication of a re-synchronization point/time in streamed media content is provided to allow playout of the streamed media content from or at a desired point/time when a client or receiver switches from multimedia broadcast multicast service (MBMS) to packet switch stream (PSS) service. Various parameters, e.g., synchronization source (SSRC) and real-time protocol (RTP) timestamp, of a last received media RTP packet is signaled to a receiver. Alternatively, the SSRC and sequence number of the last received media RTP packet is signaled to the receiver, or the SSRC, the RTP timestamp, and the sequence number of the last received media RTP packet is signaled to the receiver. Also, a UTC clock time can be calculated based upon the last received real-time control protocol (RTCP) sender report (SR) and the timestamp of the last received media RTP packet in order to effectuate proper synchronization between MBMS and PSS servers.
    • 提供流媒体内容中的重新同步点/时间的准确指示,以便当客户端或接收机从多媒体广播多播服务(MBMS)切换到分组交换机时,从或在期望点/时间播放流媒体内容 流(PSS)服务。 将最后接收到的媒体RTP分组的各种参数,例如同步源(SSRC)和实时协议(RTP)时间戳信号通知给接收机。 或者,将SSRC和最后接收到的媒体RTP分组的序列号发信号通知给接收机,或SSRC,RTP时间戳和最后接收的媒体RTP分组的序列号发信号通知接收机。 另外,可以基于最后接收到的实时控制协议(RTCP)发送者报告(SR)和最后接收到的媒体RTP分组的时间戳来计算UTC时钟时间,以便实现MBMS和PSS服务器之间的适当同步。
    • 4. 发明申请
    • ERROR CORRECTION BASED ON REPLACING PADDING BITS BY ADDITIONAL PARITY CHECK BITS
    • 基于通过附加奇偶校验位替换贴片位的错误校正
    • WO2011091850A1
    • 2011-08-04
    • PCT/EP2010/051036
    • 2010-01-28
    • NOKIA CORPORATIONBOUAZIZI, ImedKONDRAD, LukaszGABBOUJ, MoncefTALMOLA, Pekka Heikki
    • BOUAZIZI, ImedKONDRAD, LukaszGABBOUJ, MoncefTALMOLA, Pekka Heikki
    • H04L1/00
    • H04L1/0065H04L1/0078
    • An apparatus (2) is arranged to create a frame (22') for transmission in a data stream (7) by including first recovery data (23, 24), for use in forward error correction, in the frame (22') and replacing some or all of padding (21) in the frame (22') with second recovery data (25) that provides further data for forward error correction. The stream may include frames (22, 22') with and without second recovery data, for example, to convey scalable media as base layer data and enhancement layer data respectively. The apparatus (2) may be arranged to create a frame (60) with first recovery data (61, 62) which may have a relatively high number of padding bits (59). A receiving apparatus (9) may then replace the padding bits (59) in a received frame (60) with predefined padding values, to reduce effective bit error rate, before performing error correction, for example, when decoding a frame (22) without additional coding.
    • 设备(2)被布置成通过在帧(22')中包括用于前向纠错的第一恢复数据(23,24)来创建用于在数据流(7)中传输的帧(22'),以及 用第二恢复数据(25)替换帧(22')中的一些或全部填充(21),其提供用于前向纠错的另外的数据。 流可以包括具有和不具有第二恢复数据的帧(22,22'),例如,分别将可扩展媒体作为基本层数据和增强层数据传送。 装置(2)可以被布置成利用可能具有相对较高数量的填充位(59)的第一恢复数据(61,62)来创建帧(60)。 然后,接收装置(9)然后可以在执行纠错之前用预定义的填充值替换接收到的帧(60)中的填充比特(59),以在例如解码帧(22)而不进行纠错之前降低有效误码率 附加编码。