公开(公告)号：WO2019222050A1

公开(公告)日：2019-11-21

申请号：PCT/US2019/031740

申请日：2019-05-10

Applicant: QUALCOMM INCORPORATED

Inventor： GEEKIE, James Francis ,  RANJAN, Suyash ,  CHI, Xu

IPC: H04W52/02 ,  H04W76/28 ,  H04J3/06

Abstract: Methods, systems, and devices for wireless communication in a user equipment (UE) are described in which a cycle duration of an extended discontinuous reception (eDRX) cycle is determined. The UE enters a sleep state of the eDRX cycle and, based on the determination of the cycle duration, uses a first clock as a timer during the sleep state and uses a second clock as a timing calibrator during the sleep state. The first clock may have a lower power consumption and a higher frequency error, and the second clock may have a higher power consumption and a lower frequency error.

公开(公告)号：WO2017222751A1

公开(公告)日：2017-12-28

申请号：PCT/US2017/034854

申请日：2017-05-26

Applicant: QUALCOMM INCORPORATED

Inventor： CHI, Xu ,  FARIAS, Michael Naone ,  DAITA, Lalitaprasad

IPC: G06F1/06 ,  G06F1/14 ,  H03K3/011 ,  H04W52/02 ,  G06F1/32 ,  H03B5/04 ,  H03B5/36 ,  H03L1/00 ,  H03L1/02

CPC classification number: H04W52/0287 ,  G06F1/06 ,  G06F1/14 ,  G06F1/3206 ,  G06F1/324 ,  G06F1/3287 ,  G06F1/329 ,  H03B5/04 ,  H03B5/366 ,  H03L1/00 ,  H03L1/02 ,  H04W88/06 ,  Y02D10/171 ,  Y02D70/00

Abstract: Various embodiments of methods and systems for closed loop multimode sleep clock frequency compensation in a portable computing device are disclosed. An exemplary embodiment leverages a modem to determine a frequency shift on a sleep clock signal when a reference clock has transitioned into a power saving mode. Using the frequency shift calculation, a compensation capacitor may be adjusted to deliver a more optimum dummy load on the crystal oscillator when the reference clock is taken offline. The method may iterate through until the actual frequency shift of the sleep clock is within an acceptable tolerance relative to zero and, further, may also set a status bit to indicate that the sleep clock frequency is stable.

Abstract translation: 公开了用于便携式计算设备中的闭环多模式睡眠时钟频率补偿的方法和系统的各种实施例。 示例性实施例利用调制解调器来确定当参考时钟已经转换到省电模式时睡眠时钟信号上的频移。 使用频移计算，可以调整补偿电容，以在基准时钟离线时在晶体振荡器上提供更优化的假负载。 该方法可以迭代直到睡眠时钟的实际频移在相对于零的可接受容差内，并且还可以设置状态位以指示睡眠时钟频率稳定。