Fallback behavior for sounding reference signal transmissions

Inventors: Hyun-Su Cha (Oak Park, IL); Ryan Keating (Chicago, IL); Tao Tao (Shanghai, CN)

Assignee: Nokia Technologies Oy

H04W64/00 H04L5/0048

View Patent ↗

Loading inventors, assignments & file history…

Monitor This Case

Get email alerts when status or documents change.

Order Certified Copies

Most orders are placed with the USPTO same day — all within 24 business hours.

Order via The Patent Place →

Pre-filled with this patent's details

Quick Facts

Patent No.: US 12707423
App. No.: 18/710,225
Granted: Aug 11, 2026
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

Embodiments of the present disclosure relate to fallback behavior for sounding reference signal (SRS) transmissions. According to embodiments of the present disclosure, a terminal device determines an activation/deactivation on the configured SRS resource in radio resource control (RRC)_INACTIVE state and behaviours of the terminal device depend on the activation/deactivation. In this way, it improves positioning accuracy for terminal devices in RRC-INACTIVE state. Additionally, it can also improve power consumption efficiency by avoiding unnecessary power consumption of the terminal device.

Claims (75)

1 . A first device, comprising:

a processor; and

a non-transitory computer-readable medium comprising computer-executable instructions that, when executed by the processor, cause the processor to perform the following operations:

receive, from a second device, a configuration of sounding reference signal (SRS) resource for positioning to be used in an inactive state of the first device;

monitor at least one first reference signal associated with the configuration of SRS resource from the second device and at least one second reference signal associated with the configuration of the SRS resource from the second device, wherein the at least one first reference signal is a path-loss reference signal for a SRS resource set and the at least one second reference signal is a spatial relation reference signal for a SRS resource, wherein the path-loss reference signal is a positioning reference signal (PRS) resource, and wherein the spatial relation reference signal has a maximum received power, a smallest reference signal time difference, and a smallest time of arrival, among a plurality of spatial relation reference signals configured for the SRS resource set;

determine that no configured spatial relation reference signal is from a TRP which transmits the path-loss reference signal;

based on a determination that no configured spatial relation reference signal is from a TRP which transmits the path-loss reference signal, determine, among a plurality of spatial relation reference signals transmitted from a physical cell which transmits the path-loss reference signal for the SRS resource set, the spatial relation reference signal;

determine the parameter related to the at least one first reference signal based on the at least one second reference signal by:

determining path-loss estimations of the plurality of spatial relation reference signals; and

determining a path-loss based on an average value of the path-loss estimations;

determine a failure in detecting the at least one first reference signal and a success in detecting the at least one second reference signal;

based on the determination of the failure in detecting the at least one first reference signal and the success in detecting the at least one second reference signal:

trigger a timer;

continuously monitor the at least one first reference signal and the at least one second reference signal from the second device based on a monitoring period configured for an radio resource control (RRC) inactive state of the first device; and

deactivate the SRS resource based on expiry of the timer.

2 . The first device of claim 1 , wherein the computer-executable instructions further cause the processor to perform the following operation:

determine a transmission power for the SRS resource based on the path-loss.

3 . The first device of claim 2 , wherein the computer-executable instructions further cause the processor to perform the following operation:

transmit, to the second device or a core network device, a first report indicating a deactivation of the SRS resource; and

transmit, to the second device or a core network device, a second report indicating an activation of the SRS resource.

4 . The first device of claim 3 , wherein the configuration of SRS resource indicates a reference signal from a TRP or cell which transmits the at least one first reference signal being used as a fallback reference signal.

5 . The first device of claim 3 , wherein the configuration of SRS resource indicates a fallback reference signal configured for the at least one first reference signal.

6 . The first device of claim 5 , wherein the computer-executable instructions further cause the processor to perform the following operation:

in accordance with a determination of an expiration of a timer, transmit, to the second device, a request for a reconfiguration of SRS resource; or

in accordance with a determination of the expiration of the timer, transmit, to a location server, a request for downlink based positioning.

7 . The first device of claim 6 , wherein the first device is a terminal device and the second device is a network device.

8 . A system comprising:

a first device;