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Aperiodic tracking reference signal

專利號(hào)
US11997043B2
公開日期
2024-05-28
申請(qǐng)人
QUALCOMM Incorporated（US CA San Diego）
發(fā)明人
Wooseok Nam; Tao Luo
IPC分類
H04L5/00; H04W16/28; H04W72/044; H04W76/27; H04B7/0413; H04B7/06; H04W80/08
技術(shù)領(lǐng)域
bs,ue,trs,may,aperiodic,or,in,be,dl,channel
地域： CA CA San Diego

摘要

Certain aspects of the present disclosure provide techniques for determining when to transmit and transmitting an aperiodic tracking reference signal (TRS). Certain aspects provide a method for wireless communication. The method generally includes determining a channel condition change of a downlink channel between a first wireless device and a second wireless device. The method further includes determining whether the channel condition change satisfies a trigger condition. The method further includes triggering transmission of an aperiodic tracking reference signal when the channel condition change satisfies the trigger condition.

說明書

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 16/162,078, filed Oct. 16, 2018, which claims the benefit of U.S. Provisional Patent No. 62/574,185, filed Oct. 18, 2017. The contents of each of these applications are hereby incorporated by reference in their entirety.

INTRODUCTION

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for determining when to transmit and transmitting an aperiodic tracking reference signal (TRS).

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). Examples of such multiple-access technologies include Long Term Evolution (LTE) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

權(quán)利要求

1
What is claimed is:1. An apparatus for wireless communications at a user equipment (UE), comprising:one or more processors;memory coupled with the one or more processors; andinstructions stored in the memory and executable collectively by the one or more processors to cause the apparatus to:receive periodically, from a network entity, a periodic reference signal; andwhile receiving periodically, from the network entity, the periodic reference signal, receive an aperiodic reference signal from the network entity over a same number of resources as the periodic reference signal.2. The apparatus of claim 1, wherein the instructions are executable collectively by the one or more processors to further cause the apparatus to receive an indication of triggering of the aperiodic reference signal from the network entity.3. The apparatus of claim 2, wherein the indication comprises a downlink control information (DCI).4. The apparatus of claim 1, wherein each of the periodic reference signal and the aperiodic reference signal is used for time or frequency tracking.5. An apparatus for wireless communications at a network entity, comprising:one or more processors;memory coupled with the one or more processors; andinstructions stored in the memory and executable collectively by the one or more processors to cause the apparatus to:transmit periodically, to a user equipment (UE), a periodic reference signal; andwhile transmitting periodically, to the UE, the periodic reference signal, transmit an aperiodic reference signal to the UE over a same number of resources as the periodic reference signal.6. The apparatus of claim 5, wherein the instructions are executable collectively by the one or more processors to further cause the apparatus to transmit an indication of triggering of the aperiodic reference signal to the UE.7. The apparatus of claim 6, wherein the indication comprises a downlink control information (DCI).8. The apparatus of claim 5, wherein each of the periodic reference signal and the aperiodic reference signal is used for time or frequency tracking.9. A method for wireless communications at a user equipment (UE), comprising:receiving periodically, from a network entity, a periodic reference signal; andwhile receiving periodically, from the network entity, the periodic reference signal, receiving an aperiodic reference signal from the network entity over a same number of resources as the periodic reference signal.10. The method of claim 9, further comprising receiving an indication of triggering of the aperiodic reference signal from the network entity.11. The method of claim 10, wherein the indication comprises a downlink control information (DCI).12. The method of claim 9, wherein each of the periodic reference signal and the aperiodic reference signal is used for time or frequency tracking.13. A method for wireless communications at a network entity, comprising:transmitting periodically, to a user equipment (UE), a periodic reference signal; andwhile transmitting periodically, to the UE, the periodic reference signal, transmitting an aperiodic reference signal to the UE over a same number of resources as the periodic reference signal.14. The method of claim 13, further comprising transmitting an indication of triggering of the aperiodic reference signal to the UE.15. The method of claim 14, wherein the indication comprises a downlink control information (DCI).16. The method of claim 13, wherein each of the periodic reference signal and the aperiodic reference signal is used for time or frequency tracking.
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