公开(公告)号：US20190342847A1

公开(公告)日：2019-11-07

申请号：US16438652

申请日：2019-06-12

Applicant: Apple Inc.

Inventor： Lai King Tee ,  Geng Wu ,  Jun Li ,  Yuqiang Tang ,  Neng Wang ,  Hua Xu ,  Jianglei Ma

IPC: H04W56/00 ,  H04L5/00 ,  H04W72/00 ,  H04W4/06 ,  H04W72/04 ,  H04B1/713

Abstract: Neighbor cell hearability can be improved by including an additional reference signal that can be detected at a low sensitivity and a low signal-to-noise ratio, by introducing non-unity frequency reuse for the signals used for a time difference of arrival (TDOA) measurement, e.g., orthogonality of signals transmitted from the serving cell sites and the various neighbor cell sites. The new reference signal, called the TDOA-RS, is proposed to improve the hearability of neighbor cells in a cellular network that deploys 3GPP EUTRAN (LTE) system, and the TDOA-RS can be transmitted in any resource blocks (RB) for PDSCH and/or MBSFN subframe, regardless of whether the latter is on a carrier supporting both PMCH and PDSCH or not. Besides the additional TDOA-RS reference signal, an additional synchronization signal (TDOA-sync) may also be included to improve the hearability of neighbor cells.

公开(公告)号：US10330771B2

公开(公告)日：2019-06-25

申请号：US16136862

申请日：2018-09-20

Applicant: Apple Inc.

Inventor： Lai King Tee ,  Geng Wu ,  Jun Li ,  Yuqiang Tang ,  Neng Wang ,  Hua Xu ,  Jianglei Ma

IPC: G01S5/10 ,  H04W64/00 ,  H04W4/02 ,  H04W24/10 ,  H04L5/00

Abstract: Neighbor cell hearability can be improved by including an additional reference signal that can be detected at a low sensitivity and a low signal-to-noise ratio, by introducing non-unity frequency reuse for the signals used for a time difference of arrival (TDOA) measurement, e.g., orthogonality of signals transmitted from the serving cell sites and the various neighbor cell sites. The new reference signal, called the TDOA-RS, is proposed to improve the hearability of neighbor cells in a cellular network that deploys 3GPP EUTRAN (LTE) system, and the TDOA-RS can be transmitted in any resource blocks (RB) for PDSCH and/or MBSFN subframe, regardless of whether the latter is on a carrier supporting both PMCH and PDSCH or not. Besides the additional TDOA-RS reference signal, an additional synchronization signal (TDOA-sync) may also be included to improve the hearability of neighbor cells.

公开(公告)号：US10271310B2

公开(公告)日：2019-04-23

申请号：US14494810

申请日：2014-09-24

Applicant: Apple Inc.

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

IPC: H04W72/00 ,  H04W72/04 ,  H04L12/18 ,  H04W4/08 ,  H04W48/10 ,  H04B7/0413 ,  H04L1/18 ,  H04L27/26 ,  H04L29/12 ,  H04W74/00 ,  H04L5/02

Abstract: A method and system for allocating shareable wireless transmission resources. A resource pool is established. The resource pool is divided into a plurality of physical layer allocation units usable for wirelessly transmitting control information and traffic data. The allocation units are assigned at the media access control layer for the wireless transmission of the control information and traffic data. The system and method of the present invention also allows mobile stations to be dynamically grouped into multicast groupings to reduce system overhead resource requirements.

公开(公告)号：US10212017B2

公开(公告)日：2019-02-19

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 ,  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.

公开(公告)号：US20180367357A1

公开(公告)日：2018-12-20

申请号：US16110205

申请日：2018-08-23

Applicant: Apple Inc.

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

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

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：US10039100B2

公开(公告)日：2018-07-31

申请号：US15486594

申请日：2017-04-13

Applicant: Apple Inc.

Inventor： Hang Zhang ,  Jianglei Ma ,  Ming Jia ,  Sophie Vrzic ,  Mo-Han Fong ,  Dong-Sheng Yu ,  Hua Xu

IPC: H04W80/04 ,  H04W72/04 ,  H04B7/12 ,  H04L5/00 ,  H04L25/02 ,  H04L29/06 ,  H04B7/06 ,  H04L1/00 ,  H04L1/06 ,  H04L1/18 ,  H04L25/03 ,  H04L27/26 ,  H04B7/02

CPC classification number: H04W72/0446 ,  H04B7/02 ,  H04B7/0669 ,  H04B7/12 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0071 ,  H04L1/0656 ,  H04L1/1812 ,  H04L1/1887 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0039 ,  H04L5/0041 ,  H04L5/0042 ,  H04L5/0046 ,  H04L5/0048 ,  H04L5/0051 ,  H04L5/0053 ,  H04L5/006 ,  H04L5/0085 ,  H04L5/0096 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/03057 ,  H04L27/2627 ,  H04L27/2655 ,  H04L65/1066 ,  H04W72/0453

Abstract: Systems and methods for OFDM channelization are provided that allow for the coexistence of sub-band channels and diversity channels. Methods of defining diversity sub-channels and sub-band sub-channels are provided and systematic channel definition and labeling schemes are provided.

公开(公告)号：US20180167247A1

公开(公告)日：2018-06-14

申请号：US15891750

申请日：2018-02-08

Applicant: Apple Inc.

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

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

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：US09973365B2

公开(公告)日：2018-05-15

申请号：US15195083

申请日：2016-06-28

Applicant: Apple Inc.

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

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

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：US20180092098A1

公开(公告)日：2018-03-29

申请号：US15823120

申请日：2017-11-27

Applicant: APPLE INC.

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

IPC: H04W72/04

CPC classification number: H04W72/0453 ,  H04L5/0058 ,  H04L5/0091 ,  H04L5/0092 ,  H04L27/2601 ,  H04W28/06 ,  H04W72/042

Abstract: A channel descriptor management message is transmitted on a broadcast connection to a mobile terminal. The channel descriptor management message provides a format for a frame. The frame includes a resource space. The channel descriptor management message defines a plurality of channels within the resource space and allocates at least one of the channels to a plurality of users. Subsequent resource allocation messages may refer to a location within a channel rather than a location within the entire resource space.

公开(公告)号：US09929889B2

公开(公告)日：2018-03-27

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 ,  H04B7/06 ,  H04B7/08 ,  H04L5/00 ,  H04L25/02

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).