EP-4736547-A1 - TIME DIVISION MULTIPLEXING SOUNDING REFERENCE SIGNAL PORTS

EP4736547A1EP 4736547 A1EP4736547 A1EP 4736547A1EP-4736547-A1

Abstract

This disclosure relates to techniques for time division multiplexing sounding reference signal ports in a wireless communication system. A wireless device and a cellular base station may establish a wireless link. The wireless device may be configured to perform a sounding reference signal transmission with time division multiplexing sounding reference signal ports. A maximum transmit power for the wireless device for the sounding reference signal transmission may be determined based at least in part on the time division multiplexing sounding reference signal ports. A transmit power may be selected for the sounding reference signal transmission based at least in part on the maximum transmit power for the wireless device for the sounding reference signal transmission. The sounding reference signal transmission may be performed using the selected transmit power.

Inventors

SUN, HAITONG
NIU, HUANING
OTERI, OGHENEKOME
ZHANG, DAWEI
YE, CHUNXUAN
CHEN, XIANG
ZENG, WEI
BHAMRI, ANKIT

Assignees

Apple Inc.

Dates

Publication Date: 20260506
Application Date: 20240730

Claims (1)

Attorney Docket No.: 1000-25201 (P63595WO1) CLAIMS What is claimed is: 1. A method, comprising: by a wireless device: receiving information configuring a sounding reference signal (SRS) transmission with time division multiplexing (TDM) SRS ports; determining a maximum transmit power for the wireless device for the SRS transmission based at least in part on the TDM SRS ports; selecting an SRS transmit power for the SRS transmission based at least in part on the maximum transmit power for the wireless device for the SRS transmission; and performing the SRS transmission using the selected SRS transmit power. 2. The method of claim 1, wherein the method further comprises: providing wireless device capability information to a cellular base station, wherein the maximum transmit power for the wireless device for the SRS transmission is determined based at least in part on the wireless device capability information provided to the cellular base station. 3. The method of claim 2, wherein the wireless device capability information indicates one or more of: one or more maximum transmit power delta values for TDM SRS ports, wherein the one or more maximum transmit power delta values for TDM SRS ports are used in calculating maximum transmit power for the wireless device for SRS transmissions from a baseline maximum transmit power for the wireless device; or wireless device power class information for the wireless device. 4. The method of claim 2, wherein the wireless device capability information indicates a value used for determining maximum transmit power for the wireless device for SRS transmissions for each of multiple different SRS resource set usages. 5. The method of claim 2, Attorney Docket No.: 1000-25201 (P63595WO1) wherein the wireless device capability information indicates a value used for determining maximum transmit power for the wireless device for SRS transmissions that applies for multiple different SRS resource set usages. 6. The method of claim 1, wherein the maximum transmit power for the wireless device for the SRS transmission is further determined based at least in part on a number of SRS symbols for TDM SRS ports configured for the SRS transmission. 7. An apparatus, comprising: a processor configured to cause a wireless device to: receive information configuring a sounding reference signal (SRS) transmission with time division multiplexing (TDM) SRS ports; select an SRS transmit power for the SRS transmission based at least in part on the TDM SRS ports; and perform the SRS transmission using the selected SRS transmit power. 8. The apparatus of claim 7, wherein the processor is further configured to cause the wireless device to: provide wireless device capability information to a cellular base station; and receive configuration information from the cellular base station indicating a maximum transmit power for the wireless device for SRS transmission with TDM SRS ports, wherein the maximum transmit power for the wireless device for SRS transmission with TDM SRS ports is determined based at least in part on the wireless device capability information, wherein the SRS transmit power for the SRS transmission is determined based at least in part on the maximum transmit power for the wireless device for SRS transmission with TDM SRS ports. 9. The apparatus of claim 8, wherein the configuration information received from the cellular base station indicates a maximum transmit power for the wireless device for SRS transmission with TDM SRS ports for each of multiple different SRS resource set usages. Attorney Docket No.: 1000-25201 (P63595WO1) 10. The apparatus of claim 8, wherein the configuration information received from the cellular base station indicates a maximum transmit power for the wireless device for SRS transmission with TDM SRS ports that applies for multiple different SRS resource set usages. 11. The apparatus of claim 7, wherein the information configuring the SRS transmission indicates: a number of SRS symbols for TDM SRS ports configured for the SRS transmission: ‘s’; a number of repeated sets of s SRS symbols for frequency hopping configured for the SRS transmission: ‘R’; and a number of SRS symbols in a slot configured for the SRS transmission: m, wherein m is an integer multiple of sR. 12. The apparatus of claim 7, wherein the SRS transmission is a codebook-based SRS transmission with partial coherent operation, wherein, in each SRS symbol of the SRS transmission, the SRS transmission is performed using SRS ports in a same coherent SRS port group. 13. The apparatus of claim 7, wherein the processor is further configured to cause the wireless device to: determine an SRS collision handling approach for the SRS transmission in case one or more SRS symbols of the SRS transmission experience transmission collision or pre-emption. 14. The apparatus of claim 13, wherein the SRS collision handling approach includes one of: omitting the first SRS symbol that has transmission collision or pre-emption and all following SRS symbols of the SRS transmission; omitting only SRS symbols of the SRS transmission that have transmission collision or pre-emption; omitting the first set of SRS symbols for TDM SRS ports that have transmission collision or pre-emption and all following SRS symbols of the SRS transmission; Attorney Docket No.: 1000-25201 (P63595WO1) omitting only sets of SRS symbols for TDM SRS ports of the SRS transmission that have transmission collision or pre-emption. 15. The apparatus of claim 14, wherein a beginning of an earliest SRS symbol among all SRS symbols that are omitted in a same slot is used for a minimum processing time requirement consideration for SRS transmission omission. 16. A cellular base station, comprising: an antenna; a radio operably coupled to the antenna; and a processor operably coupled to the radio; wherein the cellular base station is configured to: provide information to a wireless device configuring a sounding reference signal (SRS) transmission with time division multiplexing (TDM) SRS ports; and receive, at an SRS transmit power, the SRS transmission from the wireless device, wherein the SRS transmit power is determined based at least in part on a maximum transmit power for the wireless device for the SRS transmission, and wherein the maximum transmit power is determined based at least in part on the TDM SRS ports. 17. The cellular base station of claim 16, wherein the cellular base station is further configured to: receive wireless device capability information from the wireless device; determine one or more maximum transmit power values for the wireless device for SRS transmission with TDM SRS ports based at least in part on the wireless device capability information; and transmit configuration information to the wireless device indicating the one or more maximum transmit power values for the wireless device for SRS transmission with TDM SRS ports. 18. The cellular base station of claim 17, Attorney Docket No.: 1000-25201 (P63595WO1) wherein the wireless device capability information includes a maximum transmit power delta value for the wireless device for SRS transmission with TDM SRS ports for each of one or more of: one or more SRS resource set usages; or one or more numbers of SRS symbols for TDM SRS ports. 19. The cellular base station of claim 16, wherein the information configuring the SRS transmission indicates one or more of: a number of SRS symbols for TDM SRS ports configured for the SRS transmission: ‘s’; a number of repeated sets of s SRS symbols for frequency hopping configured for the SRS transmission: ‘R’; and a number of SRS symbols in a slot configured for the SRS transmission: m, wherein m is an integer multiple of sR. 20. The cellular base station of claim 16, wherein the cellular base station is further configured to: receive wireless device capability information indicating whether one or more SRS collision handling approaches are supported by the wireless device; select a SRS collision handling approach for the wireless device based at least in part on the wireless device capability information indicating whether one or more SRS collision handling approaches are supported by the wireless device; and transmit an indication of the selected SRS collision handling approach to the wireless device.

Description

Attorney Docket No.: 1000-25201 (P63595WO1) TIME DIVISION MULTIPLEXING SOUNDING REFERENCE SIGNAL PORTS FIELD [0001] The present application relates to wireless communications, and more particularly to systems, apparatuses, and methods for time division multiplexing sounding reference signal ports in a wireless communication system. DESCRIPTION OF THE RELATED ART [0002] Wireless communication systems are rapidly growing in usage. In recent years, wireless devices such as smart phones and tablet computers have become increasingly sophisticated. In addition to supporting telephone calls, many mobile devices (i.e., user equipment devices or UEs) now provide access to the internet, email, text messaging, and navigation using the global positioning system (GPS), and are capable of operating sophisticated applications that utilize these functionalities. Additionally, there exist numerous different wireless communication technologies and standards. Some examples of wireless communication standards include GSM, UMTS (associated with, for example, WCDMA or TD-SCDMA air interfaces), LTE, LTE Advanced (LTE-A), NR, HSPA, 3GPP2 CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), IEEE 802.11 (WLAN or Wi-Fi), BLUETOOTHTM, etc. [0003] The ever-increasing number of features and functionality introduced in wireless communication devices also creates a continuous need for improvement in both wireless communications and in wireless communication devices. In particular, it is important to ensure the accuracy of transmitted and received signals through user equipment (UE) devices, e.g., through wireless devices such as cellular phones, base stations and relay stations used in wireless cellular communications. In addition, increasing the functionality of a UE device can place a significant strain on the battery life of the UE device. Thus, it is very important to also reduce power requirements in UE device designs while allowing the UE device to maintain good transmit and receive abilities for improved communications. Accordingly, improvements in the field are desired. Attorney Docket No.: 1000-25201 (P63595WO1) SUMMARY [0004] Embodiments are presented herein of apparatuses, systems, and methods for supporting time division multiplexing sounding reference signal ports in a wireless communication system. [0005] Techniques are described herein for determining the transmit power for a sounding reference signal transmission with time division multiplexing sounding reference signal ports. The techniques may account for the possibility that the maximum transmit power of a wireless device may be reduced for such a transmission, for example due to the use of only a subset of the antenna ports of the wireless device in each symbol of the sounding reference signal transmission, potentially depending on the wireless device architecture, the type of sounding reference signal transmission, and/or any of various other possible considerations. [0006] Techniques are also described herein for implementing certain constraints on sounding reference signal transmissions with time division multiplexing sounding reference signal ports, for example to support efficient and effective operation. Further, a variety of possible sounding reference signal collision handling techniques are described herein, as well as techniques for configuring a wireless device with one of multiple such possible sounding reference signal collision handling techniques. [0007] Note that the techniques described herein may be implemented in and/or used with a number of different types of devices, including but not limited to base stations, access points, cellular phones, portable media players, tablet computers, wearable devices, unmanned aerial vehicles, unmanned aerial controllers, automobiles and/or motorized vehicles, and various other computing devices. [0008] This Summary is intended to provide a brief overview of some of the subject matter described in this document. Accordingly, it will be appreciated that the above-described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims. BRIEF DESCRIPTION OF THE DRAWINGS [0009] A better understanding of the present subject matter can be obtained when the following detailed description of various embodiments is considered in conjunction with the following drawings, in which: Attorney Docket No.: 1000-25201 (P63595WO1) [0010] Figure 1 illustrates an exemplary (and simplified) wireless communication system, according to some embodiments; [0011] Figure 2 illustrates an exemplary base station in communication with an exemplary wireless user equipment (UE) device, according to some embodiments; [0012] Figure 3 illustrates an exemplary block diagram of a UE, according to some embodiments; [0013] F