Beam failure detection and link recovery test for multi-trp operation

Patent metadata

Field	Value
Publication number	US-2025274188-A1
Application number	US-202318881642-A
Country	US
Kind code	A1
Filing date	Aug 1, 2023
Priority date	Aug 5, 2022
Publication date	Aug 28, 2025
Grant date	—

Abstract

A user equipment (UE) configured for operation in a fifth-generation (5G) new radio (NR) network may be configured for Transmission-Reception Point (TRP) specific beam failure detection (BFD) and candidate beam detection (CBD) testing. For the BFD and CBD testing, the UE may monitor signal levels of a PSCell within an active downlink bandwidth part (DL-BWP) during an evaluation period, the signal levels of the PSCell including a signal-to-noise ratio (SNR) level of a reference signal received within a first beam set from a first TRP, a layer one (L1) Reference Signal Received Power (RSRP) level of a reference signal received within a second beam set from the first TRP, and a SNR level of a reference signal received within a first beam set from a second TRP.

First claim

1 . An apparatus of a user equipment (UE) configured for operation in a fifth-generation (5G) new radio (NR) network, the apparatus comprising: processing circuitry; and memory,
wherein to configure the UE for Transmission-Reception Point (TRP) specific beam failure detection (BFD) and candidate beam detection (CBD) testing, the processing circuitry is configured to: synchronize the UE to a first cell and a second cell, the first cell being a primary cell (PCell), the second cell being a primary Secondary Cell (PSCell), the PSCell being an active serving cell for the UE; and monitor signal levels of the PSCell within an active downlink bandwidth part (DL-BWP) for the BFD and the CBD testing during an evaluation period, the signal levels of the PSCell including: a signal-to-noise ratio (SNR) level of a reference signal received within a first beam set (q 0,0 ) from a first TRP; a layer one (L1) Reference Signal Received Power (RSRP) (L1-RSRP) level of a reference signal received within a second beam set (q 0,1 ) from the first TRP; and a SNR level of a reference signal received within a first beam set (q 1,0 ) from a second TRP, wherein the memory is configured to store the SNR level of the reference signal received with the first beam set from the first TRP.

2 . The apparatus of claim 1 , wherein the reference signals comprise:
Synchronization Signal Block (SSB) signals for SSB-based BFD and CBD testing; and Channel State Information Reference Signals (CSI-RS) for CSI-RS-based BFD and CBD testing.

3 . The apparatus of claim 2 , wherein for the SSB-based BFD and CBD testing, the processing circuitry is configured to evaluate whether downlink radio link quality on a configured SSB resource in the beam sets q 0,0 and q 0,1 estimated over a last T Evaluate_BFD_SSB ms period becomes worse than a threshold Q out_LR_SSB within a T Evaluate_BFD_SSB ms period.

4 . The apparatus of claim 2 , wherein the evaluation period comprises time durations T1, T2, T3, T4 and T5,
wherein during the time duration T1, the SNR level of the reference signal received within the first beam set (q 0,0 ) from the first TRP is above an RSRP threshold and the threshold Q out_LR_SSB ; and wherein during time duration T2, the SNR level of the reference signal received within the first beam set (q 0,0 ) from the first TRP falls below the RSRP threshold.

5 . The apparatus of claim 4 , wherein during the time durations T3, T4 and T4, the SNR level of the reference signal received within the first beam set (q 0,0 ) from the first TRP is below the threshold Q out_LR_SSB .

6 . The apparatus of claim 5 , wherein during the time duration T3, the processing circuitry is configured to detect beam failure for the first TRP and initiate a link recovery for the first TRP,
wherein during the time durations T4 and T5, the processing circuitry is to configure the UE to measure and evaluate beam candidates from the second beam set (q 0,1 ) for the first TRP; and wherein during the time duration T5, at a time point occurring no later than a predetermined time after a start of the time duration T5, the processing circuitry is to configure the UE to transmit a preamble on a beam associated with the beam candidates from the second beam set (q 0,1 ) for the first TRP.

7 . The apparatus of claim 6 , wherein the processing circuitry is to configure to UE to refrain from transmitting the preamble on a beam associated with the beam candidates from the second beam set (q 0,1 ) for the first TRP prior to a time point corresponding to a start of time duration T3.

8 . The apparatus of claim 6 , wherein during the time durations T1, T2, T3, T4 and T5, the processing circuitry is to configure the UE to transmit uplink signals in all subframes configured for a CSI transmission on the first cell for the second TRP;
wherein during the time durations T1 and T2, the processing circuitry is to configure the UE to transmit uplink signals in all subframes configured for a CSI transmission on the first cell for both the first TRP and the second TRP; and wherein during the time duration T2, the processing circuitry is to configure the UE to transmit uplink signals in the first cell for the first TRP and the second TRP in all uplink slots configured for CSI transmission according to a configured periodic CSI reporting for the first cell.

9 . The apparatus of claim 6 , wherein transmission of the preamble comprises an uplink transmission followed by a beam failure report containing the second beam set (q 0,1 ) of the first TRP.

10 . The apparatus of claim 6 , wherein during time durations T1, T2, T3, T4 and T5, the SNR level of the reference signal received within the first beam set (q 1,0 ) from the second TRP is above the RSRP threshold and the threshold Q out_LR_SSB .

11 . A computer-readable storage medium that stores instructions for execution by processing circuitry of a user equipment (UE) configured for operation in a fifth-generation (5G) new radio (NR) network, wherein to configure the UE for Transmission-Reception Point (TRP) specific beam failure detection (BFD) and candidate beam detection (CBD) testing, the processing circuitry is configured to:
synchronize the UE to a first cell and a second cell, the first cell being a primary cell (PCell), the second cell being a primary Secondary Cell (PSCell), the PSCell being an active serving cell for the UE; and monitor signal levels of the PSCell within an active downlink bandwidth part (DL-BWP) for the BFD and the CBD during an evaluation period, the signal levels of the PSCell including: a signal-to-noise ratio (SNR) level of a reference signal received within a first beam set (q 0,0 ) from a first TRP; a layer one (L1) Reference Signal Received Power (RSRP) (L1-RSRP) level of a reference signal received within a second beam set (q 0,1 ) from the first TRP; and a SNR level of a reference signal received within a first beam set (q 1,0 ) from a second TRP.

12 . The computer-readable storage medium of claim 11 , wherein the reference signals comprise:
Synchronization Signal Block (SSB) signals for SSB-based BFD and CBD testing; and Channel State Information Reference Signals (CSI-RS) for CSI-RS-based BFD and CBD testing.

13 . The computer-readable storage medium of claim 12 , wherein for the SSB-based BFD and CBD testing, the processing circuitry is configured to evaluate whether downlink radio link quality on a configured SSB resource in the beam sets and, estimated over a last T Evaluate_BFD_SSB ms period becomes worse than a threshold Q out_LR_SSB within a T Evaluate_BFD_SSB ms period.

14 . The computer-readable storage medium of claim 12 , wherein the evaluation period comprises time durations T1, T2, T3, T4 and T5,
wherein during the time duration T1, the SNR level of the reference signal received within the first beam set (q 0,0 ) from the first TRP is above an RSRP threshold and the threshold Q out_LR_SSB ; and wherein during time duration T2, the SNR level of the reference signal received within the first beam set (q 0,0 ) from the first TRP falls below the RSRP threshold.

15 . The computer-readable storage medium of claim 14 , wherein during the time durations T3, T4 and T4, the SNR level of the reference signal received within the first beam set (q 0,0 ) from the first TRP is below the threshold Q out_LR_SSB .

16 . The computer-readable storage medium of claim 15 , wherein during the time duration T3, the processing circuitry is configured to detect beam failure for the first TRP and initiate a link recovery for the first TRP,
wherein during the time du

Assignees

• Intel Corp

Inventors

• Li Hua
• Zhang Meng
• Burbidge Richard C
• Huang Rui
• Hwang In-Seok

Classifications

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04B17/336 Primary

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title