公开(公告)号：US20140036823A1

公开(公告)日：2014-02-06

申请号：US14040700

申请日：2013-09-29

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Ming Jia ,  Peiying Zhu ,  Wen Tong

IPC: H04L7/00

CPC classification number: H04W36/08 ,  H04B7/022 ,  H04B7/04 ,  H04B7/0413 ,  H04B7/0667 ,  H04B7/0697 ,  H04J11/0069 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0048 ,  H04L7/0008 ,  H04L27/2602 ,  H04L27/2607 ,  H04L27/2613 ,  H04L27/2627 ,  H04L27/2628 ,  H04L27/2663 ,  H04L27/2665 ,  H04L27/2672 ,  H04L27/2675

Abstract: A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.

Abstract translation: 提供了一种用于在MIMO-OFDM通信系统内执行采集，同步和小区选择的方法和装置。 执行粗同步以确定搜索窗口。 然后通过测量其第一信号样本位于搜索窗口内的信号样本的子集与已知值之间的相关性来执行精细同步。 相关性在接收信号的频域中进行。 在多输出OFDM系统中，OFDM发射机的每个天线具有唯一的已知值。 已知值作为连续导频符号对发送，每对导频符号在OFDM帧内的子载波频率的相同子集上发送。

公开(公告)号：US20130322399A1

公开(公告)日：2013-12-05

申请号：US13673289

申请日：2012-11-09

Applicant: Apple, Inc.

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

IPC: H04W36/18

CPC classification number: H04W36/18 ,  H04B7/022 ,  H04B7/0691

Abstract: Soft handoff in an OFDMA system is disclosed. If the pilot signal strength for a base station exceeds the defined threshold, the base station is added to an active set list. Subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols are divided and allocated into subchannels. The OFDM symbols are divided and multiplexed. A soft handoff zone with a first dimension of the subchannels and a second dimension of the divided and multiplexed OFDM symbols is defined. The soft handoff zone has subcarriers with a subchannel definition, for example, an identical permutation.

Abstract translation: 披露了OFDMA系统中的软切换。 如果基站的导频信号强度超过定义的阈值，则将基站添加到活动集列表中。 多个正交频分复用（OFDM）符号中的子载波被划分并分配给子信道。 OFDM符号被分割和多路复用。 定义了具有子信道的第一维度和分割和多路复用的OFDM符号的第二维度的软切换区域。 软切换区具有子信道定义的子载波，例如相同的置换。

公开(公告)号：US20130301513A1

公开(公告)日：2013-11-14

申请号：US13944343

申请日：2013-07-17

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Aaron Callard ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hang Zhang

IPC: H04W4/06 ,  H04B7/06

CPC classification number: H04W4/06 ,  H04B7/0413 ,  H04B7/0697 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/0082 ,  H04W36/0005 ,  H04W36/30 ,  H04W72/005

Abstract: Systems and methods are disclosed herein for an enhanced Multimedia Broadcast Multicast Service (MBMS) in a wireless communications network. In one embodiment, a number of base stations in a MBMS zone, or broadcast region, accommodate both Spatial Multiplexing (SM) enabled user elements and non-SM enabled user elements. In another embodiment, a number of base stations form a MBMS zone, or broadcast region, where the MBMS zone is sub-divided into an SM zone and a non-SM zone. In another embodiment, the wireless communications network includes multiple MBMS zones. For each MBMS zone, base stations serving the MBMS zone transmit an MBMS zone identifier (ID) for the MBMS zone. The MBMS zone ID may be used by a user element for decoding and/or to determine when to perform a handoff from one MBMS zone to another.

Abstract translation: 这里公开了用于无线通信网络中的增强型多媒体广播多播服务（MBMS）的系统和方法。 在一个实施例中，MBMS区域或广播区域中的多个基站适应启用的空间复用（SM）用户元件和不启用SM的用户元件。 在另一个实施例中，多个基站形成MB​​MS区域或广播区域，其中MBMS区域被划分为SM区域和非SM区域。 在另一个实施例中，无线通信网络包括多个MBMS区域。 对于每个MBMS区域，服务于MBMS区域的基站发送MBMS区域的MBMS区域标识符（ID）。 MBMS区域ID可以由用户单元用于解码和/或确定何时执行从一个MBMS区域到另一个MBMS区域的切换。

公开(公告)号：US20130246784A1

公开(公告)日：2013-09-19

申请号：US13766519

申请日：2013-02-13

Applicant: Apple, Inc.

Inventor： Hang Zhang ,  Peiying Zhu ,  Mo-Han Fong ,  Wen Tong ,  Gamini Senarath ,  Derek Yu ,  David Steer

IPC: H04W12/02

CPC classification number: H04W12/02 ,  H04B7/155 ,  H04L63/0428 ,  H04L63/0464 ,  H04L63/0478 ,  H04W28/16 ,  H04W84/18 ,  H04W88/04 ,  H04W88/08

Abstract: Security in wireless communication networks that employ relay stations to facilitate communications between base stations and mobile stations is enhanced. In one embodiment, resource information provided to one or more relay stations from a base station or another relay station is encrypted prior to being delivered to the one or more relay stations. Only authorized relay stations are allocated an appropriate key necessary to decrypt the resource information. As such, only appropriate relay stations are able to access and use the resource information to effect communications directly or indirectly between the base stations and the mobile stations. In certain embodiments, the resource information is delivered between the various base and relay stations using either unicast or multicast delivery techniques.

公开(公告)号：US11277871B2

公开(公告)日：2022-03-15

申请号：US17030078

申请日：2020-09-23

Applicant: Apple Inc.

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

IPC: H04W74/08 ,  H04L1/06 ,  H04L5/02 ,  H04L27/26 ,  H04W74/00

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.

公开(公告)号：US11258489B2

公开(公告)日：2022-02-22

申请号：US16749687

申请日：2020-01-22

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：US10973011B2

公开(公告)日：2021-04-06

申请号：US16914718

申请日：2020-06-29

Applicant: Apple Inc.

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

IPC: H04W72/04 ,  H04W68/00 ,  H04W74/08 ,  H04W72/00

Abstract: A mobile terminal in a wireless communication network may be one of several modes of operation. When in an idle mode, the mobile terminal may avoid a lengthy random access procedure normally associated with responding to a page from a base station, if the base station includes in the page an indication of a resource that the mobile terminal may utilize when responding to the page. Additionally, the mobile terminal may transmit an efficient location update MAC header to a base station, whether prompted to by a page from the base station or not. Furthermore, without leaving the idle mode or a sleep mode, the mobile terminal may exchange short data burst messages with a base station.

公开(公告)号：US10827534B2

公开(公告)日：2020-11-03

申请号：US16519111

申请日：2019-07-23

Applicant: Apple Inc.

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

IPC: H04W74/08 ,  H04L1/06 ,  H04L5/02 ,  H04L27/26 ,  H04W74/00

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.

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.

公开(公告)号：US10797764B2

公开(公告)日：2020-10-06

申请号：US16519158

申请日：2019-07-23

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Ming Jia ,  Hua Xu ,  Wen Tong ,  Peiying Zhu ,  Moussa Abdi

IPC: H04W4/00 ,  H04B7/0452 ,  H04L5/00 ,  H04L27/26 ,  H04W72/04 ,  H04B7/0413 ,  H04W88/08 ,  H04J13/18 ,  H04L1/06 ,  H04L25/02 ,  H04J13/16

Abstract: The present invention employs a pilot scheme for frequency division multiple access (FDM) communication systems, such as single carrier FDM communication systems. A given transmit time interval will include numerous traffic symbols and two or more short pilot symbols, which are spaced apart from one another by at least one traffic symbol and will have a Fourier transform length that is less than the Fourier transform length of any given traffic symbol. Multiple transmitters will generate pilot information and modulate the pilot information onto sub-carriers of the short pilot symbols in an orthogonal manner. Each transmitter may use different sub-carriers within the time and frequency domain, which is encompassed by the short pilot symbols within the transmit time interval. Alternatively, each transmitter may uniquely encode the pilot information using a unique code division multiplexed code and modulate the encoded pilot information onto common sub-carriers of the short pilot symbols.