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    • 41. 发明授权
    • Mobile station apparatus, base station apparatus, wireless communication system, and wireless communication method
    • 移动台装置,基站装置,无线通信系统以及无线通信方法
    • US09001754B2
    • 2015-04-07
    • US13388912
    • 2010-07-30
    • Yasuyuki KatoKatsunari UemuraShohei Yamada
    • Yasuyuki KatoKatsunari UemuraShohei Yamada
    • H04W4/00H04W36/00
    • H04W36/0072
    • Provided are a mobile station apparatus, a wireless communication system, and a wireless communication method that can improve reliability of handover while efficiently and early completing the handover. A mobile station apparatus 100 that switches base station apparatuses 200a and 200b to communicate with by handover includes: receiving an HO Command message including scheduled uplink transmission information from the base station apparatus of a handover source 200a; performing uplink transmission to the base station apparatus of a handover destination 200b based on the scheduled uplink transmission information; and executing handover in accordance with a random access procedure if a response is not received from the base station apparatus of a handover destination 200b with respect to a single time or plural times of the uplink transmission.
    • 提供一种能够在有效地提前完成切换的同时提高切换的可靠性的移动站装置,无线通信系统和无线通信方法。 通过切换来切换基站装置200a,200b进行通信的移动站装置100包括:从切换源200a的基站装置接收包括调度的上行链路发送信息的HO命令消息; 基于所调度的上行链路传输信息,向切换目的地200b的基站装置执行上行传输; 并且如果没有从移动目的地200b的基站装置相对于单次或多次上行链路传输接收到响应,则根据随机接入过程执行切换。
    • 50. 发明申请
    • MOBILE STATION APPARATUS, BASE STATION APPARATUS, AND RADIO LINK SYNCHRONIZATION DETERMINING METHOD
    • 移动站设备,基站设备和无线链路同步确定方法
    • US20110292824A1
    • 2011-12-01
    • US13145306
    • 2009-12-24
    • Katsunari UemuraShohei YamadaYasuyuki Kato
    • Katsunari UemuraShohei YamadaYasuyuki Kato
    • H04W24/00
    • H04W74/085H04B1/7085H04B1/7087H04B7/2125H04B7/2678H04W48/20H04W56/00H04W56/0015
    • While a mobile station apparatus is receiving a plurality of frequency bands, effective determinations of wireless link synchronization can be achieved. The mobile station apparatus measures the reception qualities of a plurality of different downlink frequency band signals (DL_CC1, DL_CC2) transmitted by one or more base station apparatuses and by the foregoing base station apparatuses. If all of the measured reception qualities are below a threshold value (Qout) (threshold value for determining downlink synchronizations), the mobile station apparatus determines that a downlink synchronization error has occurred, and then causes the downlink synchronization state to transition to an error detection part. If the mobile station apparatus successively detects the downlink synchronization error a predetermined number of times, then the mobile station apparatus causes the downlink synchronization state to transition to a synchronization protection part and simultaneously starts a downlink synchronization protection timer. If no downlink synchronization has been recovered by the expiration of the downlink synchronization protection timer, the mobile station apparatus determines that an out-of-downlink-synchronization has occurred, and then releases individually designated radio resources and thereafter starts a cell reselection.
    • 当移动站装置正在接收多个频带时,可以实现无线链路同步的有效确定。 移动站装置测定由一个以上的基站装置和上述基站装置发送的多个不同的下行链路频带信号(DL_CC1,DL_CC2)的接收质量。 如果所测量的接收质量全部低于阈值(Qout)(用于确定下行链路同步的阈值),则移动站装置判定下行链路同步误差已经发生,然后使下行链路同步状态转变为错误检测 部分。 如果移动站装置连续检测到下行同步错误预定次数,则移动站装置使下行同步状态转移到同步保护部,同时启动下行同步保护定时器。 如果下行链路同步保护定时器的期满没有恢复下行链路同步,则移动台装置判断出发生了下行链路同步异常,然后释放单独指定的无线资源,然后开始小区重选。