公开(公告)号：US10091693B2

公开(公告)日：2018-10-02

申请号：US14546732

申请日：2014-11-18

Applicant: APPLE INC.

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

IPC: H04W36/00 ,  H04W36/30 ,  H04W36/18

Abstract: The present invention facilitates handoffs for a mobile terminal in a wireless access network that is capable of supporting different types of handoffs. The different handoff types may include soft handoffs and fast base station switching (FBSS). In operation, context information associated with supporting wireless communications between the wireless access network and the mobile terminal are determined. Based on whether the context information is shared between base stations involved in the handoff or transferred from one base station to another of the base stations involved in the handoff, a particular handoff type is selected from the different handoff types that are available. Selecting the specific type of handoff to use may also be based on the level of context information that is available, the actual content of the context information, application preferences, channel conditions, base station or mobile terminal capabilities, or any combination thereof.

公开(公告)号：US20180270725A1

公开(公告)日：2018-09-20

申请号：US15982089

申请日：2018-05-17

Applicant: Apple Inc.

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

IPC: H04W36/08 ,  H04L27/26 ,  H04B7/0413

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.

公开(公告)号：US10075314B2

公开(公告)日：2018-09-11

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 ,  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：US10044460B2

公开(公告)日：2018-08-07

申请号：US15399028

申请日：2017-01-05

Applicant: Apple Inc.

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

IPC: H04B1/00 ,  H04J13/00 ,  H04B1/707 ,  H04L5/00

Abstract: In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

公开(公告)号：US09900069B2

公开(公告)日：2018-02-20

申请号：US15665711

申请日：2017-08-01

Applicant: Apple Inc.

Inventor： Wen Tong ,  Hosein Nikopour ,  Amir Khandani ,  Hua Xu ,  Ming Jia ,  Peiying Zhu ,  Dong-sheng Yu

IPC: H04B7/04 ,  H04B7/0456 ,  H04L29/06 ,  H04B7/0417 ,  H04B7/06

CPC classification number: H04B7/0478 ,  H04B7/0417 ,  H04B7/0456 ,  H04B7/0634 ,  H04B7/0639 ,  H04L69/04 ,  H04L69/14

Abstract: A codebook C is provided in a MIMO transmitter as well as a MIMO receiver. The codebook C will include M codewords ci, where i is a unique codeword index for each codeword ci. Each codeword defines weighting factors to apply to the MIMO signals, and may correspond to channel matrices or vectors to apply to the MIMO signals prior to transmission from the respective antennas of the MIMO transmitter. The present invention creates codeword subsets Si for each codeword ci of the codebook C. Each codeword subset Si defines L codewords cj, which are selected from all the codewords ci in the codebook C. The codewords cj in a codeword subset Si are the L codewords in the entire codebook that best correlate with the corresponding codeword ci.

公开(公告)号：US09838944B2

公开(公告)日：2017-12-05

申请号：US15473815

申请日：2017-03-30

Applicant: Apple Inc.

Inventor： Hang Zhang ,  Peiying Zhu ,  Wen Tong ,  Nimal Gamini Senarath ,  Derek Yu ,  David G. Steer

IPC: H04W4/00 ,  H04L12/28 ,  G01R31/08 ,  H04W40/12 ,  H04W28/18 ,  H04B7/26 ,  H04L12/46 ,  H04L29/06 ,  H04W16/26 ,  H04W28/24 ,  H04W72/04 ,  H04W76/02 ,  H04W84/04 ,  H04W84/12

CPC classification number: H04W40/12 ,  H04B7/2606 ,  H04L12/4633 ,  H04L47/24 ,  H04L47/28 ,  H04L69/22 ,  H04W16/26 ,  H04W28/18 ,  H04W28/24 ,  H04W40/22 ,  H04W72/0413 ,  H04W72/042 ,  H04W76/12 ,  H04W84/047 ,  H04W84/12

Abstract: A wireless communication access path exists between an ingress station and an egress station. A logical communication tunnel is established between the ingress and egress stations directly or through any number of intermediate relay stations to handle session flows of PDUs. As PDUs arrive, the ingress station may determine and add information bearing on an identified QoS associated with the PDU to the PDUs before they are delivered to the downstream egress station(s) or intermediate relay station(s). The information may be used by the downstream stations to schedule the PDUs for further delivery. The information may also be used by the egress station to schedule the PDUs for delivery.

公开(公告)号：US09832775B2

公开(公告)日：2017-11-28

申请号：US15075474

申请日：2016-03-21

Applicant: APPLE INC.

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

IPC: H04J11/00 ,  H04W72/04 ,  H04L5/00 ,  H04W28/06 ,  H04L27/26

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：US09825793B2

公开(公告)日：2017-11-21

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

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：US20170325209A1

公开(公告)日：2017-11-09

申请号：US15657509

申请日：2017-07-24

Applicant: Apple Inc.

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

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

CPC classification number: H04W72/0406 ,  H04L1/0002 ,  H04L1/0066 ,  H04L1/1816 ,  H04L1/1819 ,  H04L1/1845 ,  H04L5/0055 ,  H04W28/04 ,  Y02D50/10

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：US09813136B2

公开(公告)日：2017-11-07

申请号：US15357552

申请日：2016-11-21

Applicant: APPLE INC.

Inventor： Mahmoud Taherzadehboroujeni ,  Hosein Nikopour ,  Amir Khandani ,  Wen Tong ,  Ming Jia ,  Peiying Zhu ,  Dong-Sheng Yu ,  Jianglei Ma

IPC: H04B7/24 ,  H04B7/00 ,  H04L27/00 ,  H04L27/04 ,  H04B7/06 ,  H04B7/0413

CPC classification number: H04B7/0669 ,  H04B7/0413 ,  H04B7/06 ,  H04B7/0697 ,  H04B7/0891 ,  H04L1/0606 ,  H04L1/0625 ,  H04L1/0643 ,  H04L1/0668 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0028 ,  H04L27/2626

Abstract: Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided. Variable rate codes are provided that combine various fixed rate codes in a manner that results in codes whose rates are dependent on all the various fixed rate codes that are combined.