BACKGROUND

Field

The present disclosure relates generally to communication systems, and more particularly, to techniques of generating sounding reference signals (SRSs) by a user equipment (UE).

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior 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. 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, and time division synchronous code division multiple access (TD-SCDMA) systems.

These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

SUMMARY

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE determines a respective set of subcarriers from N subcarriers in each OFDM symbol of M consecutive OFDM symbols within a slot. The respective set of subcarriers carries a respective set of sounding reference signals (SRSs) that form transmission combs of a transmission comb size, M OFDM symbols including initial M1 consecutive OFDM symbols and subsequent M2 consecutive OFDM symbols, M and M1 each being an integer greater than 0, M2 being an integer greater than or equal to 0. The respective set of subcarriers in one of the M1 consecutive OFDM symbols do not overlap in frequency domain with the respective set of subcarriers in any other one of the M1 consecutive OFDM symbols.

The UE determines a respective set of phase rotations corresponding to the respective set of SRSs in each OFDM symbol of the M consecutive OFDM symbols. A given phase rotation in the respective set further rotating a predetermined phase value than a phase rotation in the respective set prior to the given phase rotation.

The UE applies the respective set of phase rotations to the respective set of SRSs in each OFDM symbol of the M1 consecutive OFDM symbols to obtain a cyclic shift. The UE maps the respective set of SRSs applied with phase rotations to the respective set of subcarriers in each OFDM symbol of the M1 consecutive OFDM symbols. When M2 is greater than 0, the UE repeats, in the M2 consecutive OFDM symbols, at least one portion of the SRSs applied with phase rotations in the M1 consecutive OFDM symbols such that all SRSs in the M2 consecutive OFDM symbols are mapped in accordance with the SRSs applied with phase rotations in the M1 consecutive OFDM symbols. The UE transmits the respective sets of SRSs in the M OFDM symbols.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.

