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    Preambles in OFDMA system
    93.
    发明授权
    Preambles in OFDMA system 有权

    公开(公告)号：US10826744B2

    公开(公告)日：2020-11-03

    申请号：US16249672

    申请日：2019-01-16

    Applicant: APPLE INC.

    Inventor： Jianglei Ma ,  Hang Zhang ,  Wen Tong ,  Ming Jia ,  Peiying Zhu ,  Mo-Han Fong

    IPC: H04L27/26 ,  H04B7/02 ,  H04L5/00 ,  H04W24/02 ,  H04B7/0452 ,  H04L7/04

    Abstract: 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-1 and Preamble-2, which may be used in different systems, including multioutput, multi-input (MIMO) systems.

    Methods and systems for enabling feedback in wireless communication networks
    94.
    发明授权
    Methods and systems for enabling feedback in wireless communication networks 有权

    公开(公告)号：US10581500B2

    公开(公告)日：2020-03-03

    申请号：US16373183

    申请日：2019-04-02

    Applicant: APPLE INC.

    Inventor： Hang Zhang ,  Mo-Han Fong ,  Peiying Zhu ,  Jianglei Ma ,  Wen Tong

    IPC: H04B7/0456 ,  H04B7/06 ,  H04L5/00 ,  H04B7/0413 ,  H04W74/06 ,  H04W72/08 ,  H04W72/04 ,  H04W48/08 ,  H04L5/02 ,  H04L27/26

    Abstract: Aspects of the present invention provide additional MAC functionality to support the PHY features of a wireless communication system framework. The additional MAC functionality aids in enabling feedback from wireless terminals to base stations. In some aspects of the invention the feedback is provided on an allocated feedback channel. In other aspects of the invention the feedback is provided by MAC protocol data units (PDU) in a header, mini-header, or subheader. The feedback may be transmitted from the wireless terminal to the base station autonomously by the wireless terminal or in response to an indication from the base station that feedback is requested. Aspects of the invention also provide for allocating feedback resources to form a dedicated feedback channel. One or more of these enhancements is included in a given implementation. Base stations and wireless terminals are also described upon which methods described herein can be implemented.

    Pilot Symbol Patterns for Transmission through a Plurality of Antennas
    95.
    发明申请
    Pilot Symbol Patterns for Transmission through a Plurality of Antennas 审中-公开

    公开(公告)号：US20200067749A1

    公开(公告)日：2020-02-27

    申请号：US16666650

    申请日：2019-10-29

    Applicant: Apple Inc.

    Inventor： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hang Zhang ,  Hua Xu ,  Dongsheng Yu

    IPC: H04L27/26 ,  H04B7/06 ,  H04W52/32 ,  H04L25/02 ,  H04L5/00 ,  H04B7/08

    Abstract: A method and apparatus for improving channel estimation within an OFDM communication system. Channel estimation in OFDM is usually performed with the aid of pilot symbols. The pilot symbols are typically spaced in time and frequency. The set of frequencies and times at which pilot symbols are inserted is referred to as a pilot pattern. In some cases, the pilot pattern is a diagonal-shaped lattice, either regular or irregular. The method first interpolates in the direction of larger coherence (time or frequency). Using these measurements, the density of pilot symbols in the direction of faster change will be increased thereby improving channel estimation without increasing overhead. As such, the results of the first interpolating step can then be used to assist the interpolation in the dimension of smaller coherence (time or frequency).

    Method and system for combining DFT-transformed OFDM and non-transformed OFDM
    96.
    发明授权
    Method and system for combining DFT-transformed OFDM and non-transformed OFDM 有权

    公开(公告)号：US10554464B2

    公开(公告)日：2020-02-04

    申请号：US16273302

    申请日：2019-02-12

    Applicant: Apple Inc.

    Inventor： Jianglei Ma ,  Wen Tong ,  Ming Jia ,  Hua Xu ,  Peiying Zhu ,  Hang Zhang

    IPC: H04B7/005 ,  H04L27/26 ,  H04L1/00 ,  H04L5/00

    Abstract: Methods and systems are provided that enable an OFDM transmitter to be used for transmitting conventional OFDM or a form of transformed OFDM. A technique is provided for transforming a coded and modulated sequence of samples prior to an IFFT that enables the transformed sequence of samples to be transmitted using conventional OFDM or transformed OFDM. The selection of a transform function for transforming the coded and modulated sequence of samples may be based on optimizing the transform function for particular operating conditions between the transmitter and receiver. In some embodiments of the invention OFDM and time transformed OFDM are multiplexed in time and/or frequency in a transmission frame. In some embodiments of the invention a pilot pattern is provided in which the pilot are sent using OFDM and data is sent using OFDM and/or transformed OFDM.

    Medium Access Control for Wireless Systems
    98.
    发明申请
    Medium Access Control for Wireless Systems 审中-公开

    公开(公告)号：US20190124588A1

    公开(公告)日：2019-04-25

    申请号：US16223409

    申请日：2018-12-18

    Applicant: APPLE INC.

    Inventor： Mo-Han Fong ,  Hang Zhang ,  Robert Novak

    IPC: H04W48/16 ,  H04L29/06 ,  H04W52/26 ,  H04W24/00 ,  H04W8/26

    CPC classification number: H04W48/16 ,  H04L63/162 ,  H04W8/26 ,  H04W24/00 ,  H04W52/262 ,  H04W74/00

    Abstract: A method for execution by a mobile station (MS) in a mobile communications network, the method comprising: receiving a first MS identifier from the network during a ranging operation involving the MS; using the first MS identifier to extract the contents of at least one message received from the network during said ranging operation; using a second MS identifier, different from the first MS identifier, to extract the contents of at least one message received from the network after said ranging operation is complete. Also, a method for execution by the base station, comprising: outputting a first message destined for the MS, the first message including a first identifier for use by the MS during a ranging operation; determining that said ranging operation is complete; outputting a second message destined for the MS, the second message including a second identifier for use by the MS in subsequent communication with the network.

    Methods and systems for resource allocation
    100.
    发明授权
    Methods and systems for resource allocation 有权

    公开(公告)号：US10110353B2

    公开(公告)日：2018-10-23

    申请号：US15473768

    申请日：2017-03-30

    Applicant: Apple Inc.

    Inventor： Robert Novak ,  Mo-Han Fong ,  Hang Zhang ,  Sophie Vrzic

    IPC: H04L5/00 ,  H04L1/18 ,  H04W52/34 ,  H04W52/48 ,  H04W72/04 ,  H04W72/12

    Abstract: Various methods and systems are provided for allocating time-frequency resources for downlink (DL) and uplink (UL) communications between base stations and mobile stations. Different forms of resource allocation messages including combinations of bitmaps and bitfields provide additional information about the resources and/or how they are assigned. In some implementations the resource allocation messages enable reduced overhead, which may ultimately improve transmission rates and/or the quality of transmissions.

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