公开(公告)号：US10901067B2

公开(公告)日：2021-01-26

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: G01S5/10 ,  H04B1/713 ,  H04W4/06 ,  H04W56/00 ,  H04W72/00 ,  H04W72/04 ,  H04W64/00 ,  H04W24/10 ,  H04W4/02 ,  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：US20200091973A1

公开(公告)日：2020-03-19

申请号：US16690905

申请日：2019-11-21

Applicant: Apple Inc.

Inventor： Lai King Tee ,  Yi Song ,  Neng Wang

IPC: H04B7/0456 ,  H04B7/06 ,  H04L25/03

Abstract: The present invention provides for an improved application of signal strength weightings in a SDMA sectorized cellular network. The improved signal strength weightings application is conducted through the improved selection of weightings from a new codebook subset or by the selection of weightings from a larger codebook subset. In a further embodiment, an antenna beam index or bit map can be used to select the best beam(s) in a SDMA sectorized cellular network. In another embodiment, a field or factor in an uplink or downlink transmission packet can designate which directional transmission beam is best suited for the transmission or when the directional transmission beam should be activated.

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：US10097247B2

公开(公告)日：2018-10-09

申请号：US15372537

申请日：2016-12-08

Applicant: Apple Inc.

Inventor： Sairamesh Nammi ,  Shankar Venkatraman ,  Gaurav Hemrajani ,  Ashvin Chheda ,  Lai King Tee ,  Neng Wang ,  Kathiravetpillai Sivanesan

IPC: H04B7/0417 ,  H04W4/20 ,  H04B7/06 ,  H04L5/00 ,  H04W72/04

Abstract: To report feedback information regarding a wireless channel, a mobile station determines whether a predefined condition is satisfied. In response to determining that the predefined condition is satisfied, feedback information regarding an individual one of plural subbands of the wireless channel is included in a first report to be sent to a base station. In response to determining that the predefined condition is not satisfied, aggregate feedback information regarding the plural subbands is included in a second report to be sent to the base station.

公开(公告)号：US10063298B2

公开(公告)日：2018-08-28

申请号：US15894154

申请日：2018-02-12

Applicant: Apple Inc.

Inventor： Lai King Tee ,  Yi Song ,  Neng Wang

IPC: H04B1/00 ,  H04B15/00 ,  H04B7/0456 ,  H04B7/06 ,  H04L25/03 ,  H04B7/0452

CPC classification number: H04B7/0456 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0469 ,  H04B7/0478 ,  H04B7/0639 ,  H04B7/0695 ,  H04L25/03828

Abstract: The present invention provides for an improved application of signal strength weightings in a SDMA sectorized cellular network. The improved signal strength weightings application is conducted through the improved selection of weightings from a new codebook subset or by the selection of weightings from a larger codebook subset. In a further embodiment, an antenna beam index or bit map can be used to select the best beam(s) in a SDMA sectorized cellular network. In another embodiment, a field or factor in an uplink or downlink transmission packet can designate which directional transmission beam is best suited for the transmission or when the directional transmission beam should be activated.

公开(公告)号：US20140376501A1

公开(公告)日：2014-12-25

申请号：US14481360

申请日：2014-09-09

Applicant: Apple Inc.

Inventor： Sairamesh Nammi ,  Shankar Venkatraman ,  Gaurav Hemrajani ,  Ashvin Chheda ,  Lai King Tee ,  Neng Wang ,  Kathiravetpillai Sivanesan

IPC: H04B7/06

CPC classification number: H04B7/0417 ,  H04B7/0619 ,  H04B7/063 ,  H04L5/0096 ,  H04W4/20 ,  H04W72/0413

Abstract: To report feedback information regarding a wireless channel, a mobile station determines whether a predefined condition is satisfied. In response to determining that the predefined condition is satisfied, feedback information regarding an individual one of plural subbands of the wireless channel is included in a first report to be sent to a base station. In response to determining that the predefined condition is not satisfied, aggregate feedback information regarding the plural subbands is included in a second report to be sent to the base station.