FIELD OF THE DISCLOSURE

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for frequency hopping enhancements for sounding reference signal (SRS) transmission.

BACKGROUND

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These 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, etc.). Examples of such multiple-access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) 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, to name a few.

In some examples, a wireless multiple-access communication system may include a number of base stations (BSs), which are each capable of simultaneously supporting communication for multiple communication devices, otherwise known as user equipments (UEs). In an LTE or LTE-A network, a set of one or more base stations may define an eNodeB (eNB). In other examples (e.g., in a next generation, a new radio (NR), or 5G network), a wireless multiple access communication system may include a number of distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmission reception points (TRPs), etc.) in communication with a number of central units (CUs) (e.g., central nodes (CNs), access node controllers (ANCs), etc.), where a set of one or more distributed units, in communication with a central unit, may define an access node (e.g., which may be referred to as a base station, 5G NB, next generation NodeB (gNB or gNodeB), TRP, etc.). A base station or distributed unit may communicate with a set of UEs on downlink channels (e.g., for transmissions from a base station or to a UE) and uplink channels (e.g., for transmissions from a UE to a base station or distributed unit).

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. New Radio (NR) (e.g., 5G) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP. It 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 OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL). To these ends, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in NR and LTE technology. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

BRIEF SUMMARY

The systems, methods, and devices of the disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of this disclosure as expressed by the claims which follow, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled “Detailed Description” one will understand how the features of this disclosure provide advantages that include improved communications between access points and stations in a wireless network.

Certain aspects provide a method, performed by a user equipment (UE), for wireless communication. The method generally includes determining a first sounding reference signal (SRS) frequency hopping pattern for transmitting one or more SRSs; determining an antenna switch will occur during the transmission of the one or more SRSs; determining a second SRS frequency hopping pattern for transmitting the one or more SRSs, wherein determining the second SRS frequency hopping pattern comprises using the first SRS frequency hopping pattern to generate the second SRS frequency hopping pattern based on the determined antenna switch; and transmitting a first set of SRSs of the one or more SRSs according to the first SRS frequency hopping pattern and transmitting a second set of SRSs of the one or more SRSs according to the second SRS frequency hopping pattern.

Certain aspects provide an apparatus for wireless communications by a user equipment. The apparatus generally includes at least one processor configured to determine a first sounding reference signal (SRS) frequency hopping pattern for transmitting one or more SRSs; determine an antenna switch will occur during the transmission of the one or more SRSs; determine a second SRS frequency hopping pattern for transmitting the one or more SRSs, wherein determining the second SRS frequency hopping pattern comprises using the first SRS frequency hopping pattern to generate the second SRS frequency hopping pattern based on the determined antenna switch; and transmit a first set of SRSs of the one or more SRSs according to the first SRS frequency hopping pattern and transmitting a second set of SRSs of the one or more SRSs according to the second SRS frequency hopping pattern. The apparatus also generally includes a memory coupled with the at least one processor.

Certain aspects provide an apparatus for wireless communications by a user equipment in a network. The apparatus generally includes means for determining a first sounding reference signal (SRS) frequency hopping pattern for transmitting one or more SRSs; means for determining an antenna switch will occur during the transmission of the one or more SRSs; means for determining a second SRS frequency hopping pattern for transmitting the one or more SRSs, wherein determining the second SRS frequency hopping pattern comprises using the first SRS frequency hopping pattern to generate the second SRS frequency hopping pattern based on the determined antenna switch; and means for transmitting a first set of SRSs of the one or more SRSs according to the first SRS frequency hopping pattern and transmitting a second set of SRSs of the one or more SRSs according to the second SRS frequency hopping pattern.

Certain aspects provide a non-transitory computer-readable medium for wireless communications by a user equipment in a network. The non-transitory computer-readable medium generally includes instructions that, when executed by at least one processor, cause the at least one processor to determine a first sounding reference signal (SRS) frequency hopping pattern for transmitting one or more SRSs; determine an antenna switch will occur during the transmission of the one or more SRSs; determine a second SRS frequency hopping pattern for transmitting the one or more SRSs, wherein determining the second SRS frequency hopping pattern comprises using the first SRS frequency hopping pattern to generate the second SRS frequency hopping pattern based on the determined antenna switch; and transmit a first set of SRSs of the one or more SRSs according to the first SRS frequency hopping pattern and transmitting a second set of SRSs of the one or more SRSs according to the second SRS frequency hopping pattern.

Certain aspects provide a method for wireless communications by a base station (BS). The method generally includes receiving a first set of SRSs of one or more SRSs in a subframe according to a first SRS frequency hopping pattern and receiving a second set of SRSs of one or more SRSs in the subframe according to a second SRS frequency hopping pattern, wherein the second SRS frequency hopping pattern is generated from the first SRS frequency hopping pattern based on an antenna switch in the subframe.

Certain aspects provide an apparatus for wireless communications by a base station (BS). The apparatus generally includes at least one processor configured to receive a first set of SRSs of one or more SRSs in a subframe according to a first SRS frequency hopping pattern and receive a second set of SRSs of one or more SRSs in the subframe according to a second SRS frequency hopping pattern, wherein the second SRS frequency hopping pattern is generated from the first SRS frequency hopping pattern based on an antenna switch in the subframe. The apparatus also generally includes a memory coupled with the at least one processor.

Certain aspects provide an apparatus for wireless communications by a base station (BS). The apparatus generally includes means for receiving a first set of SRSs of one or more SRSs in a subframe according to a first SRS frequency hopping pattern and means for receiving a second set of SRSs of one or more SRSs in the subframe according to a second SRS frequency hopping pattern, wherein the second SRS frequency hopping pattern is generated from the first SRS frequency hopping pattern based on an antenna switch in the subframe.

Certain aspects provide a non-transitory computer-readable medium for wireless communications by a base station (BS). The non-transitory computer-readable medium generally includes instructions that, when executed by at least one processor, cause the at least one processor to receive a first set of SRSs of one or more SRSs in a subframe according to a first SRS frequency hopping pattern and receive a second set of SRSs of one or more SRSs in the subframe according to a second SRS frequency hopping pattern, wherein the second SRS frequency hopping pattern is generated from the first SRS frequency hopping pattern based on an antenna switch in the subframe.

Certain aspects of the present disclosure also provide various apparatus, means, and computer readable medium configured to perform (or cause a processor to perform) the operations described herein.

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 appended 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.

