公开(公告)号：US20190173701A1

公开(公告)日：2019-06-06

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: H04L27/26 ,  H04L5/00 ,  H04L1/00

CPC classification number: H04L27/263 ,  H04L1/0003 ,  H04L1/0009 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0096 ,  H04L27/2613 ,  H04L27/2628 ,  H04L27/2634 ,  H04L27/2646

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.

公开(公告)号：US20190166594A1

公开(公告)日：2019-05-30

申请号：US16263247

申请日：2019-01-31

Applicant: Apple Inc.

Inventor： Wen Tong ,  Leo L. Strawczynski ,  Shalini Periyalwar ,  Claude Royer

IPC: H04W72/04 ,  H04L5/00 ,  H04W28/04 ,  H04L1/18 ,  H04L1/00

Abstract: A system and method for transmitting high speed data on fixed rate and for variable rate channels. The system and method provides the flexibility of adjusting the data rate, the coding rate, and the nature of individual retransmissions. Further, the system and method supports partial soft combining of retransmitted data with previously transmitted data, supports parity bit selection for successive retransmissions, and supports various combinations of data rate variations, coding rate variations, and partial data transmissions.

公开(公告)号：US20190158328A1

公开(公告)日：2019-05-23

申请号：US16255702

申请日：2019-01-23

Applicant: Apple Inc.

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

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

CPC classification number: H04L27/2611 ,  H04B7/06 ,  H04B7/08 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0618 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/0051 ,  H04L25/02 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/2602 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2647 ,  H04W52/325

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).

公开(公告)号：US10263677B2

公开(公告)日：2019-04-16

申请号：US14685252

申请日：2015-04-13

Applicant: APPLE INC.

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

IPC: H04B7/0456 ,  H04B7/06 ,  H04L5/00 ,  H04W48/08 ,  H04B7/0413 ,  H04W72/04 ,  H04W72/08 ,  H04W74/06 ,  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.

公开(公告)号：US10237106B2

公开(公告)日：2019-03-19

申请号：US15790678

申请日：2017-10-23

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.

公开(公告)号：US20180152331A1

公开(公告)日：2018-05-31

申请号：US15823072

申请日：2017-11-27

Applicant: APPLE INC.

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

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

CPC classification number: H04L27/2692 ,  H04B7/02 ,  H04B7/0452 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0048 ,  H04L7/043 ,  H04L27/2613 ,  H04L27/265 ,  H04L27/2655 ,  H04L27/2686 ,  H04W24/02

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

公开(公告)号：US09985716B2

公开(公告)日：2018-05-29

申请号：US14968070

申请日：2015-12-14

Applicant: Apple Inc.

Inventor： Guo Qiang Wang ,  Wen Tong ,  Shiquan Wu

IPC: H04B7/155 ,  H04B7/26 ,  H04L12/741 ,  H04L12/713 ,  H04W40/24 ,  H04W40/22 ,  H04L12/823 ,  H04W76/02 ,  H04W40/12

CPC classification number: H04B7/15592 ,  H04B7/155 ,  H04B7/2606 ,  H04L45/54 ,  H04L45/586 ,  H04L45/745 ,  H04L47/32 ,  H04W40/12 ,  H04W40/22 ,  H04W40/24 ,  H04W76/12

Abstract: In a wireless multi-hop relay network arranged in a tree topology, the base station and one or more relay stations are associated as a virtual base station (VBS). The base station and each relay station have a unique virtual base station identifier (VBS-ID) associated with the path defined by the base station and the one or more relay stations. A relay station in the branch uses its VBS-ID for communicating with an attached subscriber station (e.g. a mobile station) such that communications between the base station and subscriber station occur via the VBS. Subscriber station data communications are relayed between the base station and the one or more relay stations over the VBS via a tunnel connection. The VBS is auto configurable. Mobility for subscriber stations and 10 relay stations is provided through reconfiguration of VBS's.

公开(公告)号：US20170331659A1

公开(公告)日：2017-11-16

申请号：US15642956

申请日：2017-07-06

Applicant: Apple Inc.

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

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

CPC classification number: H04L27/2611 ,  H04B7/06 ,  H04B7/08 ,  H04L5/0007 ,  H04L5/0023 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/2626 ,  H04L27/2647

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).

公开(公告)号：US20170238225A1

公开(公告)日：2017-08-17

申请号：US15489988

申请日：2017-04-18

Applicant: Apple Inc.

Inventor： Nimal Senarath ,  Bill Gage ,  Shalini Periyalwar ,  Wen Tong

IPC: H04W36/18 ,  H04W36/20 ,  H04W72/04 ,  H04L5/00 ,  H04W36/00

CPC classification number: H04W36/18 ,  H04L5/0048 ,  H04W36/0072 ,  H04W36/20 ,  H04W36/24 ,  H04W72/0446 ,  H04W80/02

Abstract: The present invention provides a method and system for facilitating efficient handoff and data throughput in mobile broadband communication systems. Methods implemented by a system constructed in accordance with the principles of the present invention include selectively enabled soft handoff, performing Layer 2 bearer functions at the base station and using the mobile device to coordinate soft handoff and interference avoidance without the need for a centralized coordination function.

公开(公告)号：US09723636B2

公开(公告)日：2017-08-01

申请号：US15382930

申请日：2016-12-19

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Hua Xu ,  Ming Jia ,  Sarah Boumendil ,  Evelyne Le Strat ,  Hang Zhang ,  Peiying Zhu ,  Wen Tong

IPC: H04W74/08 ,  H04L27/26

CPC classification number: H04W74/0891 ,  H04L1/06 ,  H04L1/0618 ,  H04L5/023 ,  H04L27/2627 ,  H04L27/2657 ,  H04L27/2662 ,  H04W74/006 ,  H04W74/0866

Abstract: Physical layer structures and access schemes for use in such networks are described and in particular initial access channel (IACH) structures are proposed. A spectrum efficient downlink (DL) IACH design supports different types of User Equipment (UE) capabilities and different system bandwidths. An IACH includes the synchronization channel (SCH) and broadcast-control channel (BCH). A non-uniform SCH for all system bandwidths is provided, as well as scalable bandwidth BCH depending on system bandwidth. An initial access procedure is provided, as well as an access procedure.