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    • 7. 发明申请
    • Fast feedback contention-based ranging procedure in wireless communications systems
    • 无线通信系统中基于快速反馈竞争的测距程序
    • US20090274041A1
    • 2009-11-05
    • US12387380
    • 2009-04-30
    • Chao-Chin ChouYi-Shen ChenI-Kang Fu
    • Chao-Chin ChouYi-Shen ChenI-Kang Fu
    • H04J1/16H04B7/216
    • H04J3/0682H04W74/008
    • A fast feedback mechanism is provided in a contention-based ranging procedure. A Subscriber Station (SS) initializes a ranging procedure by sending a ranging code on a selected ranging opportunity for resource access to a Base Station (BS) on a shared ranging channel in a previous uplink frame. The SS also starts a time associated with the ranging code. In response to all received ranging opportunities, the BS broadcasts an acknowledgement (ACK) in a subsequent downlink frame. The ACK comprises a reception status message that indicates the decoding status of the ranging opportunities. With the novel fast feedback mechanism, when ranging collision or failure occurs, upon receiving the reception status report, the SS will proceed with the next round of contention without continuing wait for the entire timeout period. As a result, the total latency due to the ranging collision or failure is reduced.
    • 在基于竞争的测距过程中提供了快速反馈机制。 订户站(SS)通过在所选择的测距机会上发送测距码来初始化测距过程,以便在先前的上行链路帧中的共享测距信道上的基站(BS)进行资源接入。 SS还启动与测距代码相关联的时间。 响应于所有接收到的测距机会,BS在随后的下行链路帧中广播确认(ACK)。 ACK包括指示测距机会的解码状态的接收状态消息。 利用新颖的快速反馈机制,当发生测距碰撞或故障时,在接收到接收状态报告后,SS将继续进行下一轮的争用,而不用等待整个超时时间。 结果,减少了由于测距碰撞或故障引起的总延迟。