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    Random access channel for OFDM-MIMO system
    5.
    发明授权
    Random access channel for OFDM-MIMO system 有权
    OFDM-MIMO系统的随机接入信道

    公开(公告)号：US09113484B2

    公开(公告)日：2015-08-18

    申请号：US13845606

    申请日：2013-03-18

    Applicant: InterDigital Technology Corporation

    Inventor： Fatih M. Ozluturk

    IPC: H04W4/00 ,  H04W74/08 ,  H04W74/00 ,  H04L27/26

    CPC classification number: H04W74/0833 ,  H04B7/0413 ,  H04J13/0059 ,  H04L27/2608 ,  H04L27/2637 ,  H04W74/004 ,  H04W74/0866

    Abstract: In orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) systems, a wireless transmit/receive unit (WTRU) selects a random access channel (RACH) and a phase for a constant amplitude zero auto correlation (CAZAC) sequence for RACH transmission. The WTRU then transmits a RACH transmission to a Node B via the selected RACH. Once the RACH transmission is detected, the Node B sends an acknowledgement (ACK) to the WTRU over an ACK channel. The Node B may transmit the ACK on a shared channel. The WTRU may ramp up transmit power while the RACH transmission is transmitted, or steps up transmit power of a subsequent RACH transmission. The RACH transmission and data transmission may be either time multiplexed or frequency multiplexed. A plurality of RACHs may be defined and one of the defined RACHs may be selected randomly or based on predetermined criteria.

    Abstract translation: 在正交频分复用（OFDM）多输入多输出（MIMO）系统中，无线发射/接收单元（WTRU）选择随机接入信道（RACH）和恒定幅度零自相关（CAZAC）序列的相位 用于RACH传输。 然后，WTRU经由所选择的RACH向节点B发送RACH传输。 一旦检测到RACH传输，节点B通过ACK信道向WTRU发送确认（ACK）。 节点B可以在共享信道上发送ACK。 WTRU可以在发送RACH传输时提高发射功率，或者增加随后的RACH传输的发射功率。 RACH传输和数据传输可以是时分复用的或频率复用的。 可以定义多个RACH，并且可以随机地或基于预定标准来选择所定义的RACH中的一个。

    USER EQUIPMENT AND BASE STATION FOR FRAME TIMING AND CELL GROUP SYNCHRONIZATION
    7.
    发明申请
    USER EQUIPMENT AND BASE STATION FOR FRAME TIMING AND CELL GROUP SYNCHRONIZATION 审中-公开
    用户设备和基站的框架时序和小区组同步

    公开(公告)号：US20160219542A1

    公开(公告)日：2016-07-28

    申请号：US15088868

    申请日：2016-04-01

    Applicant: InterDigital Technology Corporation

    Inventor： Nadir Sezgin ,  Fatih M. Ozluturk

    IPC: H04W56/00 ,  H04W72/04 ,  H04L27/20 ,  H04L5/14

    CPC classification number: H04W56/002 ,  H04B1/70735 ,  H04B1/7083 ,  H04B1/7093 ,  H04J2011/0006 ,  H04L5/14 ,  H04L27/2053 ,  H04W56/00 ,  H04W72/042 ,  H04W88/02 ,  H04W88/08

    Abstract: Methods and systems for receiving a primary and secondary synchronization signal from a cell are provided. The secondary synchronization signal may be derived from at least one of a set of sequences and received based on the timing of the received primary synchronization signal. Determining a time slot within a frame of the received secondary synchronization signal and a group of the cell is provided, wherein the time slot and the group are determined by at least one sequence of the secondary synchronization signal and at least one carrier out of a plurality of carriers used for one sequence out of the at least one sequence of the secondary synchronization signal. Determining a frame timing and a sequence used by the cell, based on the received primary synchronization signal and the secondary synchronization signal is further provided.

    Abstract translation: 提供了用于从单元接收主要和次要同步信号的方法和系统。 次同步信号可以从序列集合中的至少一个导出，并且基于所接收的主同步信号的定时接收。 提供确定所接收的次同步信号的帧内的时隙和所述小区的组，其中所述时隙和所述组由所述辅同步信号的至少一个序列和多个中的至少一个载波确定 用于从次同步信号的至少一个序列中的一个序列的载波。 还提供基于所接收的主同步信号和次同步信号来确定小区使用的帧定时和序列。

    SEAMLESS HANDOFF SYSTEM AND METHOD
    8.
    发明申请
    SEAMLESS HANDOFF SYSTEM AND METHOD 审中-公开
    无缝手柄系统和方法

    公开(公告)号：US20160142958A1

    公开(公告)日：2016-05-19

    申请号：US15005441

    申请日：2016-01-25

    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

    Inventor： Fatih M. Ozluturk

    IPC: H04W36/18 ,  H04W52/40 ,  H04W56/00 ,  H04L5/00 ,  H04W52/36 ,  H04W52/22

    CPC classification number: H04W36/18 ,  H04L5/005 ,  H04W36/08 ,  H04W36/30 ,  H04W52/0261 ,  H04W52/228 ,  H04W52/362 ,  H04W52/40 ,  H04W56/0015 ,  H04W88/02 ,  H04W88/08

    Abstract: A multicellular communications system where transmission between a roving subscriber and multiple base station transceivers is maintained throughout the territory. Each mobile subscriber unit has global code seeds for the entire communications system or an updated neighbor list and continuously searches to access available cell base stations while maintaining a communication link with one base station. Candidate cell base stations are interrogated and communicated with. The candidate base station that requires less transmitting energy from the mobile subscriber unit is closely monitored. When the mobile subscriber unit can successfully communicate with less transmit power than currently required by the present base station, the mobile subscriber unit is handed off to the candidate base station transceiver.

    Abstract translation: 一个多细胞通信系统，其中在整个领土内保持了流动用户和多个基站收发器之间的传输。 每个移动用户单元具有用于整个通信系统或更新的邻居列表的全球代码种子，并且在维护与一个基站的通信链路的同时不断搜索访问可用的小区基站。 候选单元基站被询问并通信。 密切监测从移动用户单元需要更少发射能量的候选基站。 当移动用户单元能够以比当前基站所要求的更少的发送功率成功地进行通信时，移动用户单元被切换到候选基站收发信机。

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