FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for tracking reference signals with concentrated power per tone.

DESCRIPTION OF RELATED ART

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, and/or the like). Examples of such multiple-access technologies include 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, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

A wireless network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A user equipment (UE) may communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. New Radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful.

SUMMARY

In some aspects, a method of wireless communication performed by a user equipment (UE) includes receiving, based at least in part on one or more coverage enhancement requirements associated with the UE, a tracking reference signal (TRS) indication that indicates a set of resources corresponding to a TRS; and receiving the TRS, wherein the TRS includes a plurality of tones, wherein a transmission power for each tone of the plurality of tones is inversely proportional to a bandwidth difference between a bandwidth of the TRS and a reference bandwidth associated with the TRS.

In some aspects, the TRS indication indicates a plurality of periodic TRS instances, a number of the periodic TRS instances is based at least in part on the one or more coverage enhancement requirements associated with the UE.

In some aspects, the TRS indication is carried in a radio resource control message.

In some aspects, the TRS indication is carried in a dynamic transmission.

In some aspects, the dynamic transmission comprises at least one of: a UE-specific downlink control information (DCI) transmission, a group-common DCI transmission, a UE-specific medium access control (MAC)-control element (MAC-CE), or a group-common MAC-CE.

In some aspects, the TRS indication activates a configured TRS.

In some aspects, the configured TRS comprises one or more parameters corresponding to the TRS.

In some aspects, the method includes receiving an additional TRS indication, wherein the additional TRS indication comprises a dynamic indication of an additional set of resources associated with the TRS.

In some aspects, the additional TRS indication indicates an additional bandwidth corresponding to the additional set of resources.

In some aspects, the method includes receiving an indication of an expiry timer corresponding to the TRS.

In some aspects, the TRS indication indicates the expiry timer corresponding to the TRS.

In some aspects, the method includes receiving an additional TRS, wherein the additional TRS comprises the reference bandwidth based at least in part on a determination that the expiry timer is expired.

In some aspects, the indication of the expiry timer comprises a dynamic indication.

In some aspects, a method of wireless communication performed by a base station includes transmitting, based at least in part on one or more coverage enhancement requirements associated with a UE, a TRS indication that indicates a set of resources corresponding to a TRS; and transmitting the TRS, the TRS comprising a plurality of tones, wherein a transmission power for each tone of the plurality of tones is inversely proportional to a bandwidth difference between a bandwidth of the TRS and a reference bandwidth associated with the TRS.

In some aspects, the TRS indication indicates a plurality of periodic TRS instances, a number of the periodic TRS instances is based at least in part on the one or more coverage enhancement requirements associated with the UE.

In some aspects, the TRS indication is carried in a radio resource control message.

In some aspects, the TRS indication is carried in a dynamic transmission.

In some aspects, the dynamic transmission comprises at least one of: a UE-specific DCI transmission, a group-common DCI transmission, a UE-specific MAC-CE, or a group-common MAC-CE.

In some aspects, the TRS indication activates a configured TRS.

In some aspects, the configured TRS comprises one or more parameters corresponding to the TRS.

In some aspects, the method includes transmitting an additional TRS indication, wherein the additional TRS indication comprises a dynamic indication of an additional set of resources associated with the TRS.

In some aspects, the additional TRS indication indicates an additional bandwidth corresponding to the additional set of resources.

In some aspects, the method includes transmitting an indication of an expiry timer corresponding to the TRS.

In some aspects, the TRS indication indicates the expiry timer corresponding to the TRS.

In some aspects, the method includes transmitting an additional TRS, wherein the additional TRS comprises the reference bandwidth based at least in part on a determination that the expiry timer is expired.

In some aspects, the indication of the expiry timer comprises a dynamic indication.

In some aspects, a UE for wireless communication includes a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: receive, based at least in part on one or more coverage enhancement requirements associated with the UE, a TRS indication that indicates a set of resources corresponding to a TRS; and receive the TRS, wherein the TRS includes a plurality of tones, wherein a transmission power for each tone of the plurality of tones is inversely proportional to a bandwidth difference between a bandwidth of the TRS and a reference bandwidth associated with the TRS.

In some aspects, the TRS indication indicates a plurality of periodic TRS instances, a number of the periodic TRS instances is based at least in part on the one or more coverage enhancement requirements associated with the UE.

In some aspects, the TRS indication is carried in a radio resource control message.

In some aspects, the TRS indication is carried in a dynamic transmission.

In some aspects, the dynamic transmission comprises at least one of: a UE-specific DCI transmission, a group-common DCI transmission, a UE-specific MAC-CE, or a group-common MAC-CE.

In some aspects, the TRS indication activates a configured TRS.

In some aspects, the configured TRS comprises one or more parameters corresponding to the TRS.

In some aspects, the one or more processors are further configured to receive an additional TRS indication, the additional TRS indication comprises a dynamic indication of an additional set of resources associated with the TRS.

In some aspects, the additional TRS indication indicates an additional bandwidth corresponding to the additional set of resources.

In some aspects, the one or more processors are further configured to receive an indication of an expiry timer corresponding to the TRS.

In some aspects, the TRS indication indicates the expiry timer corresponding to the TRS.

In some aspects, the one or more processors are further configured to receive an additional TRS, the additional TRS comprises the reference bandwidth based at least in part on a determination that the expiry timer is expired.

In some aspects, the indication of the expiry timer comprises a dynamic indication.

In some aspects, a base station for wireless communication includes a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: transmit, based at least in part on one or more coverage enhancement requirements associated with a UE, a TRS indication that indicates a set of resources corresponding to a TRS; and transmit the TRS, the TRS comprising a plurality of tones, wherein a transmission power for each tone of the plurality of tones is inversely proportional to a bandwidth difference between a bandwidth of the TRS and a reference bandwidth associated with the TRS.

In some aspects, the TRS indication indicates a plurality of periodic TRS instances, a number of the periodic TRS instances is based at least in part on the one or more coverage enhancement requirements associated with the UE.

In some aspects, the TRS indication is carried in a radio resource control message.

In some aspects, the TRS indication is carried in a dynamic transmission.

In some aspects, the dynamic transmission comprises at least one of: a UE-specific DCI transmission, a group-common DCI transmission, a UE-specific MAC-CE, or a group-common MAC-CE.

In some aspects, the TRS indication activates a configured TRS.

In some aspects, the configured TRS comprises one or more parameters corresponding to the TRS.

In some aspects, the one or more processors are further configured to transmit an additional TRS indication, the additional TRS indication comprises a dynamic indication of an additional set of resources associated with the TRS.

In some aspects, the additional TRS indication indicates an additional bandwidth corresponding to the additional set of resources.

In some aspects, the one or more processors are further configured to transmit an indication of an expiry timer corresponding to the TRS.

In some aspects, the TRS indication indicates the expiry timer corresponding to the TRS.

In some aspects, the one or more processors are further configured to transmit an additional TRS, the additional TRS comprises the reference bandwidth based at least in part on a determination that the expiry timer is expired.

In some aspects, the indication of the expiry timer comprises a dynamic indication.

In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: receive, based at least in part on one or more coverage enhancement requirements associated with the UE, a TRS indication that indicates a set of resources corresponding to a TRS; and receive the TRS, wherein the TRS includes a plurality of tones, wherein a transmission power for each tone of the plurality of tones is inversely proportional to a bandwidth difference between a bandwidth of the TRS and a reference bandwidth associated with the TRS.

In some aspects, the TRS indication indicates a plurality of periodic TRS instances, a number of the periodic TRS instances is based at least in part on the one or more coverage enhancement requirements associated with the UE.

In some aspects, the TRS indication is carried in a radio resource control message.

In some aspects, the TRS indication is carried in a dynamic transmission.

In some aspects, the dynamic transmission comprises at least one of: a UE-specific DCI transmission, a group-common DCI transmission, a UE-specific MAC-CE, or a group-common MAC-CE.

In some aspects, the TRS indication activates a configured TRS.

In some aspects, the configured TRS comprises one or more parameters corresponding to the TRS.

In some aspects, the one or more instructions further cause the UE to receive an additional TRS indication, the additional TRS indication comprises a dynamic indication of an additional set of resources associated with the TRS.

In some aspects, the additional TRS indication indicates an additional bandwidth corresponding to the additional set of resources.

In some aspects, the one or more instructions further cause the UE to receive an indication of an expiry timer corresponding to the TRS.

In some aspects, the TRS indication indicates the expiry timer corresponding to the TRS.

In some aspects, the one or more instructions further cause the UE to receive an additional TRS, the additional TRS comprises the reference bandwidth based at least in part on a determination that the expiry timer is expired.

In some aspects, the indication of the expiry timer comprises a dynamic indication.

In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station, cause the base station to: transmit, based at least in part on one or more coverage enhancement requirements associated with a UE, a TRS indication that indicates a set of resources corresponding to a TRS; and transmit the TRS, the TRS comprising a plurality of tones, wherein a transmission power for each tone of the plurality of tones is inversely proportional to a bandwidth difference between a bandwidth of the TRS and a reference bandwidth associated with the TRS.

In some aspects, the TRS indication indicates a plurality of periodic TRS instances, a number of the periodic TRS instances is based at least in part on the one or more coverage enhancement requirements associated with the UE.

In some aspects, the TRS indication is carried in a radio resource control message.

In some aspects, the TRS indication is carried in a dynamic transmission.

In some aspects, the dynamic transmission comprises at least one of: a UE-specific DCI transmission, a group-common DCI transmission, a UE-specific MAC-CE, or a group-common MAC-CE.

In some aspects, the TRS indication activates a configured TRS.

In some aspects, the configured TRS comprises one or more parameters corresponding to the TRS.

In some aspects, the one or more instructions further cause the base station to transmit an additional TRS indication, the additional TRS indication comprises a dynamic indication of an additional set of resources associated with the TRS.

In some aspects, the additional TRS indication indicates an additional bandwidth corresponding to the additional set of resources.

In some aspects, the one or more instructions further cause the base station to transmit an indication of an expiry timer corresponding to the TRS.

In some aspects, the TRS indication indicates the expiry timer corresponding to the TRS.

In some aspects, the one or more instructions further cause the base station to transmit an additional TRS, the additional TRS comprises the reference bandwidth based at least in part on a determination that the expiry timer is expired.

In some aspects, the indication of the expiry timer comprises a dynamic indication.

In some aspects, an apparatus for wireless communication includes means for receiving, based at least in part on one or more coverage enhancement requirements associated with the apparatus, a TRS indication that indicates a set of resources corresponding to a TRS; and means for receiving the TRS, wherein the TRS includes a plurality of tones, wherein a transmission power for each tone of the plurality of tones is inversely proportional to a bandwidth difference between a bandwidth of the TRS and a reference bandwidth associated with the TRS.

In some aspects, the TRS indication indicates a plurality of periodic TRS instances, a number of the periodic TRS instances is based at least in part on the one or more coverage enhancement requirements associated with the apparatus.

In some aspects, the TRS indication is carried in a radio resource control message.

In some aspects, the TRS indication is carried in a dynamic transmission.

In some aspects, the dynamic transmission comprises at least one of: a UE-specific DCI transmission, a group-common DCI transmission, a UE-specific MAC-CE, or a group-common MAC-CE.

In some aspects, the TRS indication activates a configured TRS.

In some aspects, the configured TRS comprises one or more parameters corresponding to the TRS.

In some aspects, the apparatus includes means for receiving an additional TRS indication, wherein the additional TRS indication comprises a dynamic indication of an additional set of resources associated with the TRS.

In some aspects, the additional TRS indication indicates an additional bandwidth corresponding to the additional set of resources.

In some aspects, the apparatus includes means for receiving an indication of an expiry timer corresponding to the TRS.

In some aspects, the TRS indication indicates the expiry timer corresponding to the TRS.

In some aspects, the apparatus includes means for receiving an additional TRS, wherein the additional TRS comprises the reference bandwidth based at least in part on a determination that the expiry timer is expired.

In some aspects, the indication of the expiry timer comprises a dynamic indication.

In some aspects, an apparatus for wireless communication includes means for transmitting, based at least in part on one or more coverage enhancement requirements associated with a UE, a TRS indication that indicates a set of resources corresponding to a TRS; and means for transmitting the TRS, the TRS comprising a plurality of tones, wherein a transmission power for each tone of the plurality of tones is inversely proportional to a bandwidth difference between a bandwidth of the TRS and a reference bandwidth associated with the TRS.

In some aspects, the TRS indication indicates a plurality of periodic TRS instances, a number of the periodic TRS instances is based at least in part on the one or more coverage enhancement requirements associated with the UE.

In some aspects, the TRS indication is carried in a radio resource control message.

In some aspects, the TRS indication is carried in a dynamic transmission.

In some aspects, the dynamic transmission comprises at least one of: a UE-specific DCI transmission, a group-common DCI transmission, a UE-specific MAC-CE, or a group-common MAC-CE.

In some aspects, the TRS indication activates a configured TRS.

In some aspects, the configured TRS comprises one or more parameters corresponding to the TRS.

In some aspects, the apparatus includes means for transmitting an additional TRS indication, wherein the additional TRS indication comprises a dynamic indication of an additional set of resources associated with the TRS.

In some aspects, the additional TRS indication indicates an additional bandwidth corresponding to the additional set of resources.

In some aspects, the apparatus includes means for transmitting an indication of an expiry timer corresponding to the TRS.

In some aspects, the TRS indication indicates the expiry timer corresponding to the TRS.

In some aspects, the apparatus includes means for transmitting an additional TRS, wherein the additional TRS comprises the reference bandwidth based at least in part on a determination that the expiry timer is expired.

In some aspects, the indication of the expiry timer comprises a dynamic indication.

In some aspects, a method, device, apparatus, computer program product, non-transitory computer-readable medium, user equipment, base station, node, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and specification.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings, specification, and appendix.

The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims.

