公开(公告)号：WO2018052677A1

公开(公告)日：2018-03-22

申请号：PCT/US2017/048269

申请日：2017-08-23

Applicant: QUALCOMM INCORPORATED

Inventor： JAIN, Amit ,  CHANDRASEKAR, Harisrinivas ,  NIRULA, Gautam

IPC: G01S1/04 ,  G01S1/20 ,  G01S5/00 ,  G01S5/02 ,  G01S5/10 ,  H04W64/00

Abstract: Techniques disclosed herein help a location server identify inaccuracies in a list of neighboring cells provided by the location server by enabling mobile devices during an OTDOA session to opportunistically take Reference Signal Time Difference (RSTD) measurements of additional cells not on the neighboring cell list (345, 350). The mobile device can then provide these RSTD measurements back to the server (365), which can optimize its algorithm for determining neighboring cells based on these measurements.

Abstract translation: 这里公开的技术通过在OTDOA会话期间使移动设备能够机会地进行附加小区的参考信号时间差（RSTD）测量来帮助位置服务器识别位置服务器所提供的相邻小区的列表中的不准确性 而不是在相邻的小区列表（345,350）上。 然后，移动设备可以将这些RSTD测量结果提供回服务器（365），服务器可以基于这些测量结果优化其用于确定相邻小区的算法。

公开(公告)号：WO2018080700A1

公开(公告)日：2018-05-03

申请号：PCT/US2017/053655

申请日：2017-09-27

Applicant: QUALCOMM INCORPORATED

Inventor： KANDASAMY, Prabhu ,  MORRISON, William ,  CHANDRASEKAR, Harisrinivas ,  KUSHWAHA, Manish

IPC: G01S19/25

CPC classification number: G01S19/235 ,  G01S19/252 ,  G01S19/256 ,  G01S19/47 ,  G01S19/51

Abstract: A mobile device is capable of accurately maintaining a global time based on Satellite Position System (SPS) time decoded from an SPS signal using a clock signal acquired from a wireless communication transmitter, such as a base station or access point. The time uncertainty is reduced or minimized by determining a relative change in position of the mobile device with respect to a base position, e.g., a reference position determined from a previous SPS session. The time uncertainty may be determined based on the relative change in position with respect to the base position by transforming it into time units based on the speed of light. The global time may be updated based on the determined time uncertainty, which may be used in a subsequent SPS session to reduce the search window to acquire SPS satellite signals.

Abstract translation: 基于从SPS信号解码的卫星定位系统（SPS）时间，使用从无线通信发射器（例如基站）获取的时钟信号，移动设备能够准确地维持全球时间，或者 切入点。 通过确定移动设备相对于基准位置的相对位置变化（例如，根据先前的SPS会话确定的基准位置）来减少或最小化时间不确定性。 时间不确定性可以基于通过基于光速将其转换成时间单位的相对于基准位置的相对位置变化来确定。 全球时间可以基于所确定的时间不确定性来更新，所述时间不确定性可以用于随后的SPS会话中以减少搜索窗口以获取SPS卫星信号。

公开(公告)号：WO2018048579A1

公开(公告)日：2018-03-15

申请号：PCT/US2017/046720

申请日：2017-08-14

Applicant: QUALCOMM INCORPORATED

Inventor： JAIN, Amit ,  CHANDRASEKAR, Harisrinivas ,  RISTIC, Borislav ,  SUBRAMANI, Dinesh ,  NIRULA, Gautam ,  KANDASAMY, Prabhu

IPC: G01S5/10 ,  G01S5/02

CPC classification number: H04W4/025 ,  G01S5/02 ,  G01S5/10 ,  H04W24/08

Abstract: Disclosed embodiments pertain to combining Reference Signal Time Difference (RSTD) measurements from partial measurement sessions that result when a single measurement session is interrupted by one or more interruption events including Out of Service (OOS) or Inter-Frequency Handover (IFH) events. In some embodiments, first Time Of Arrival (TOA) measurements of cellular signals during a plurality of discontiguous partial measurement sessions separated by one or more interruption events may be obtained. Second TOA measurements based on a reference time source may be obtained for a plurality of the first TOA measurements from at least two partial measurement sessions. A cell associated with a second TOA measurement may be selected as a reference cell and for each non-reference cell associated with a second TOA measurement, a corresponding RSTD measurement may be obtained relative to the selected reference cell.

Abstract translation: 所公开的实施例涉及组合来自部分测量会话的参考信号时间差（RSTD）测量，当单个测量会话被一个或多个中断事件中断时产生，所述一个或多个中断事件包括服务中断（Out of Service，OOS） 频率切换（IFH）事件。 在一些实施例中，可以获得由一个或多个中断事件分离的多个不连续的部分测量会话期间的蜂窝信号的第一到达时间（TOA）测量。 可以针对来自至少两个部分测量会话的多个第一TOA测量结果获得基于参考时间源的第二TOA测量结果。 可以选择与第二TOA测量相关联的小区作为参考小区，并且对于与第二TOA测量相关联的每个非参考小区，可以相对于所选参考小区获得相应的RSTD测量。

公开(公告)号：WO2019055207A1

公开(公告)日：2019-03-21

申请号：PCT/US2018/048244

申请日：2018-08-28

Applicant: QUALCOMM INCORPORATED

Inventor： CHANDRASEKAR, Harisrinivas ,  KANDASAMY, Prabhu ,  BONDA, Naveen Kumar V.

IPC: G01S19/25

Abstract: A method for validating time assistance data includes receiving, at a mobile device, the time assistance data via a first wireless communication technology from a serving cell. The method also includes obtaining a reference global navigation satellite system (GNSS) time, at the mobile device, via a second wireless communication technology and determining whether the time assistance data is valid based on the reference GNSS time. Further included in the method is determining a validated GNSS time based on the time assistance data in response to determining that the time assistance data is valid.

公开(公告)号：WO2019055204A1

公开(公告)日：2019-03-21

申请号：PCT/US2018/048231

申请日：2018-08-28

Applicant: QUALCOMM INCORPORATED

Inventor： CHANDRASEKAR, Harisrinivas ,  KANDASAMY, Prabhu ,  BONDA, Naveen Kumar V.

IPC: G01S19/46 ,  G01S19/47 ,  G01S19/24

CPC classification number: G01S19/06 ,  G01S19/07 ,  G01S19/246 ,  G01S19/35 ,  G01S19/46 ,  G01S19/47

Abstract: Methods and systems are disclosed for processing satellite positioning system (SPS) signals at a mobile device. In an embodiment, SPS signals may be acquired at multiple instances over a first duration while the mobile device is camped on one or more signals transmitted by a first access device (202). The mobile device may then determine a second duration of time to acquire a subsequent SPS signal based, at least in part, on the acquired SPS signals, representations of system time in signals received from the first access device contemporaneously with acquisition of the SPS signals and an indication of stationarity of the mobile device during the first duration (204).