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    WIRELESS COMMUNICATION METHOD AND SYSTEM
    3.
    发明申请
    WIRELESS COMMUNICATION METHOD AND SYSTEM 审中-公开
    无线通信方法与系统

    公开(公告)号：WO2007060749A1

    公开(公告)日：2007-05-31

    申请号：PCT/JP2005/021944

    申请日：2005-11-22

    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY INCORPORATED ADMINISTRATIVE AGENCY ,  QI, Yihong ,  KOHNO, Ryuji

    Inventor： QI, Yihong ,  KOHNO, Ryuji

    IPC: H04B1/69 ,  H04L27/26

    CPC classification number: H04L25/4902 ,  H04B1/71632 ,  H04B1/7183

    Abstract: Wireless communication method for wireless communication from transmitter to receiver, comprising: transmission step at which said transmitter transmits sequence of radio pulses as a data packet which comprises: preamble section which consists of a preamble sequence for initial symbol synchronization and channel estimation; header section which consists of both regular header information on said data packet and multiplexed preamble sequences; payload section which consists of both regular payload message of said data packet and multiplexed preamble sequences, receiving step at which said receiver receives said data packet consisting of said preamble, header and payload section.

    Abstract translation: 一种用于从发射机到接收机的无线通信的无线通信方法，包括：发射步骤，其中所述发射机发送无线电脉冲序列作为数据分组，其包括：前导部分，其由用于初始符号同步的前导序列和信道估计组成; 标题部分，其包括关于所述数据分组的常规报头信息和多路复用前同步码序列; 净荷部分由所述数据分组的常规有效负载消息和多路复用的前导序列组成，接收步骤，所述接收机接收由所述前导码，报头和有效载荷部分组成的数据分组。

    DELAY ESTIMATION APPARATUS AND METHOD
    4.
    发明申请
    DELAY ESTIMATION APPARATUS AND METHOD 审中-公开
    延迟估计装置和方法

    公开(公告)号：WO2007007408A1

    公开(公告)日：2007-01-18

    申请号：PCT/JP2005/012980

    申请日：2005-07-07

    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY INCORPORATED ADMINISTRATIVE AGENCY ,  QI, Yihong ,  KOHNO, Ryuji

    Inventor： QI, Yihong ,  KOHNO, Ryuji

    IPC: G01S11/08

    CPC classification number: G01S11/08 ,  G01S5/0221

    Abstract: The delay estimation apparatus (34) according to this invention comprises: a correlator (41) which generates a correlation function between a received signal and a supplied template waveform; an AD (analog to digital) converter (42) which samples said correlation function generated at said correlator into discrete samples; and an arithmetic operation section (43) which obtains time delays of multipath components of said received signal based on said discrete samples generated at said AD converter, wherein said arithmetic operation section includes an iteration procedure where in each iteration, the time delay and the amplitude of the strongest signal component are estimated based on the present sample sequence, and said sample sequence is updated by deducting the estimated strongest component from said sample sequence; said iteration is terminated when a termination criterion is satisfied. Specifically, in each said iteration, said amplitude estimate of said strongest component is given by the maximum likelihood (ML) solution. The delay estimation apparatus according to this invention can be adopted for the first arrival detection or wireless ranging.

    Abstract translation: 根据本发明的延迟估计装置（34）包括：相关器（41），其产生接收信号和提供的模板波形之间的相关函数; AD（模数）转换器（42），其将在所述相关器处产生的所述相关函数采样为离散样本; 以及算术运算部（43），其基于在所述AD转换器处生成的所述离散样本获得所述接收信号的多径分量的时间延迟，其中所述算术运算部分包括迭代过程，其中在每次迭代中，所述延迟和幅度 基于本样本序列估计最强信号分量，并且通过从所述样本序列中扣除所估计的最强分量来更新所述样本序列; 当满足终止标准时，表示迭代终止。 具体地，在每个所述迭代中，所述最强分量的所述振幅估计由最大似然（ML）解决方案给出。 根据本发明的延迟估计装置可以用于第一到达检测或无线测距。

    DELAY ESTIMATION APPARATUS AND METHOD
    5.
    发明申请
    DELAY ESTIMATION APPARATUS AND METHOD 审中-公开
    延迟估计装置和方法

    公开(公告)号：WO2007004307A1

    公开(公告)日：2007-01-11

    申请号：PCT/JP2005/012885

    申请日：2005-07-06

    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY INCORPORATED ADMINISTRATIVE AGENCY ,  QI, Yihong ,  KOHNO, Ryuji

    Inventor： QI, Yihong ,  KOHNO, Ryuji

    IPC: H04B1/69

    CPC classification number: H04L25/0212 ,  H04B1/7183 ,  H04J3/0682

    Abstract: Delay estimation apparatus and method, comprising: a correlation step which a correlation function between a received signal and a supplied template waveform is generated, AD conversion step at which said correlation output generated at said correlation step is uniformly sampled into discrete samples; and arithmetic operation step at which a time delay estimate of the received signal based on said discrete samples generated at said AD conversion step is computed, wherein a selection criterion depending on the digital sampling frequency used at said AD conversion means is checked, if said selection criterion is satisfied, computes the time delay estimate based on the direct pick method, and if said selection criterion does not hold, computes the time delay estimate based on the simplified maximum likelihood (ML) method.

    Abstract translation: 延迟估计装置和方法包括：生成接收信号和提供的模板波形之间的相关函数的相关步骤，将在所述相关步骤中产生的所述相关输出均匀地采样到离散样本的AD转换步骤; 以及算术运算步骤，其中计算基于在所述AD转换步骤产生的所述离散样本的接收信号的时间延迟估计，其中检查根据所述AD转换装置使用的数字采样频率的选择标准，如果所述选择 基于直接选择方法计算时间延迟估计，并且如果所述选择标准不成立，则基于简化最大似然（ML）方法计算时间延迟估计。

    METHOD FOR LINK FAILURE DETECTION AND SESSION TRANSFER TO A LIVELY LINK IN THE MULTIHOMING ENVIRONMENT OF ID/LOCATOR SPLIT-BASED NETWORKS
    7.
    发明申请
    METHOD FOR LINK FAILURE DETECTION AND SESSION TRANSFER TO A LIVELY LINK IN THE MULTIHOMING ENVIRONMENT OF ID/LOCATOR SPLIT-BASED NETWORKS 审中-公开
    用于链路故障检测和会话转移到基于ID /定位器分布式网络的多个环境中的生命链路的方法

    公开(公告)号：WO2014132286A1

    公开(公告)日：2014-09-04

    申请号：PCT/JP2013/001155

    申请日：2013-02-27

    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY

    Inventor： KAFLE, Ved ,  HARAI, Hiroaki

    IPC: H04W76/02 ,  H04L12/70

    CPC classification number: H04L45/28 ,  H04W24/04 ,  H04W60/005 ,  H04W76/15 ,  H04W76/19 ,  H04W88/06

    Abstract: This invention specifies mechanisms for detection of failure of links directly attached to communication devices (hosts and gateways) or lying in the path between these devices. The invention also specifies mechanisms for recovering communication sessions when the failure occurs. The failure in a link connected to the host or to the gateway is detected by using a link layer trigger by the respective node while the gateway failure or failure in a remote link is detected by a signaling mechanism initiated by the host on the basis of two control timers, probe timer and keepalive timer. The edge router and gateway also assist the host to detect the failure and quickly start the recovery process. They perform packet redirection through a lively link to the host, thus reducing or completely avoiding packet losses while the host performs the recovery mechanism to transfer the session from the failed link to the lively link.

    Abstract translation: 本发明规定了用于检测直接连接到通信设备（主机和网关）或位于这些设备之间的路径中的链路故障的机制。 本发明还指定了当发生故障时恢复通信会话的机制。 通过使用相应节点的链路层触发来检测连接到主机或网关的链路中的故障，而远程链路中的网关故障或故障由主机基于两个主机发起的信令机制来检测 控制定时器，探测定时器和keepalive定时器。 边缘路由器和网关还协助主机检测故障，并快速启动恢复过程。 它们通过与主机的活跃链路执行数据包重定向，从而减少或完全避免数据包丢失，同时主机执行恢复机制将会话从故障链路传输到活跃的链路。

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