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    • 3. 发明授权
    • Preambles in OFDMA system
    • OFDMA系统中的前缀
    • US08340072B2
    • 2012-12-25
    • US13114579
    • 2011-05-24
    • Jianglei MaHang ZhangWen TongMing JiaPeiying ZhuMo-Han Fong
    • Jianglei MaHang ZhangWen TongMing JiaPeiying ZhuMo-Han Fong
    • H04W72/04
    • H04L27/2692H04B7/02H04B7/0452H04L5/0007H04L5/0023H04L5/0048H04L7/043H04L27/2613H04L27/265H04L27/2655H04L27/2686H04W24/02
    • The present invention provides a preamble that is inserted into an OFDMA frame and has a common sequence for all the base stations participating in a transmission. The subscriber station performs fine synchronization using the common sequence on the common preamble, and the resulting peaks will provide the locations of candidate base stations. The base station specific search is then performed in the vicinities of those peaks by using base station specific pseudo-noise sequences. With this two stage cell search, the searching window is drastically reduced. The preamble is matched to known values by a respective receiver to decode the signals and permit multiple signals to be transferred from the transmitter to the receiver. The preamble may comprise two parts, Preamble-I and Preamble-2, which may be used in different systems, including multioutput, multi-input (MIMO) systems.
    • 本发明提供插入到OFDMA帧中并具有参与传输的所有基站的公共序列的前同步码。 用户站使用公共前导码上的公共序列执行精细同步,并且所得到的峰值将提供候选基站的位置。 然后通过使用基站专用伪噪声序列,在那些峰附近执行基站专用搜索。 通过这两个阶段的单元格搜索,搜索窗口大大减少。 前导码由相应的接收机与已知值匹配以对信号进行解码,并允许多个信号从发射机传送到接收机。 前导码可以包括两个部分,即前导码1和前导码2,其可以在不同的系统中使用,包括多输入多输入(MIMO)系统。
    • 9. 发明授权
    • Handoffs and handoff selection in a wireless access network
    • 无线接入网络中的切换和切换选择
    • US08909226B2
    • 2014-12-09
    • US11570028
    • 2005-06-03
    • Hang ZhangMo-Han FongJianglei MaPeiying ZhuWen Tong
    • Hang ZhangMo-Han FongJianglei MaPeiying ZhuWen Tong
    • H04W36/00H04W36/30H04W36/18
    • H04W36/0033H04W36/18H04W36/30
    • The present invention facilitates handoffs for a mobile terminal in a wireless access network that is capable of supporting different types of handoffs. The different handoff types may include soft handoffs and fast base station switching (FBSS). In operation, context information associated with supporting wireless communications between the wireless access network and the mobile terminal are determined. Based on whether the context information is shared between base stations involved in the handoff or transferred from one base station to another of the base stations involved in the handoff, a particular handoff type is selected from the different handoff types that are available. Selecting the specific type of handoff to use may also be based on the level of context information that is available, the actual content of the context information, application preferences, channel conditions, base station or mobile terminal capabilities, or any combination thereof.
    • 本发明有助于能够支持不同类型的切换的无线接入网络中的移动终端的切换。 不同的切换类型可以包括软切换和快速基站切换(FBSS)。 在操作中,确定与支持无线接入网络和移动终端之间的无线通信相关联的上下文信息。 基于上下文信息是否在切换中涉及的基站或从一个基站传送到切换中涉及的基站的另一个基站之间共享,从可用的不同切换类型中选择特定切换类型。 选择要使用的特定类型的切换还可以基于可用的上下文信息的级别,上下文信息的实际内容,应用偏好,信道条件,基站或移动终端能力,或其任何组合。