Channel state information (CSI) reporting techniques for secondary cell (SCELL) activation

Patent metadata

Field	Value
Publication number	US-12526677-B2
Application number	US-202218049493-A
Country	US
Kind code	B2
Filing date	Oct 25, 2022
Priority date	Oct 25, 2022
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

This disclosure provides systems, methods and apparatuses that support channel state information (CSI) reporting techniques for secondary cell (SCell) activation. A user equipment (UE) may receive one or more medium access control-control elements (MAC-CEs) that indicate a secondary cell (SCell) activation command, an aperiodic tracking reference signal (AP-TRS) trigger, and an aperiodic channel state information (AP-CSI) report trigger. The network entity may signal the SCell activation command, the AP-TRS trigger, and the AP-CSI report trigger in the same MAC-CE or in separate MAC-CEs. The UE may receive and measure AP-TRS in accordance with the AP-TRS trigger indicated by the one or more MAC-CEs, and may perform measurements via an aperiodic channel measurement resource (AP-CMR) and an aperiodic interference measurement resource (AP-IMR) in accordance with the AP-CSI report trigger indicated by the one or more MAC-CEs. Accordingly, the UE may transmit an AP-CSI report associated with the measurements.

First claim

What is claimed is:

1 . A user equipment (UE), comprising:
a processing system that includes one or more processors and one or more code-storing memories coupled with the one or more processors, the processing system configured to cause the UE to:
obtain, via a first set of resources associated with a first cell, at least one medium access control (MAC)-control element (CE) that activates a second cell and triggers aperiodic channel state information (CSI) reporting for the second cell;
obtain, in accordance with the at least one MAC-CE, one or more aperiodic reference signals via a second set of resources associated with the second cell; and
output an aperiodic CSI report associated with a measurement of the one or more aperiodic reference signals.

2 . The UE of claim 1 , wherein, to obtain the at least one MAC-CE, the processing system is further configured to:
obtain, via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, a first indication to trigger aperiodic tracking reference signal (TRS) measurements for the second cell and a second indication to trigger the aperiodic CSI reporting for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein obtaining the one or more aperiodic reference signals via the second set of resources is in accordance with the second indication.

3 . The UE apparatus of claim 1 , wherein, to obtain the at least one MAC-CE, the processing system is further configured to:
obtain a first MAC-CE that activates the second cell and triggers aperiodic tracking reference signal (TRS) measurements for the second cell; and obtain a second MAC-CE that triggers the aperiodic CSI reporting for the second cell, wherein obtaining the one or more aperiodic reference signals is in accordance with the second MAC-CE.

4 . The UE of claim 1 , wherein the processing system is further configured to:
obtain an indication of a plurality of aperiodic channel measurement resources (CMRs) and a plurality of aperiodic interference measurement resources (IMRs) associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs comprise the second set of resources.

5 . The UE of claim 4 , wherein the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with the aperiodic CSI reporting triggered by the at least one MAC-CE that activates the second cell.

6 . The UE of claim 4 , wherein the at least one MAC-CE indicates the second set of resources from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, and wherein the second set of resources comprises an aperiodic CMR from the plurality of aperiodic CMRs and an aperiodic IMR from the plurality of aperiodic IMRs.

7 . The UE of claim 1 , wherein the processing system is further configured to:
obtain at least one aperiodic tracking reference signal (TRS) via a third set of resources associated with the second cell, wherein the at least one MAC-CE further triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE that triggers the aperiodic CSI reporting indicates a time offset between the third set of resources and the second set of resources.

8 . The UE of claim 7 , wherein the processing system is further configured to:
output a message that indicates a quantity of slots associated with the time offset between the third set of resources and the second set of resources, wherein the quantity of slots is associated with a threshold duration of the time offset between the third set of resources and the second set of resources and is associated with a capability of the apparatus to acquire downlink synchronization using the at least one aperiodic TRS, and wherein the second set of resources are scheduled according to a downlink resource availability of a network entity.

9 . The UE of claim 8 , wherein the second set of resources and the third set of resources are scheduled in a same time slot if the message indicates a quantity of zero slots associated with the time offset between the third set of resources and the second set of resources.

10 . The UE of claim 1 , wherein the processing system is further configured to
output hybrid automatic repeat request (HARQ)-acknowledgement (ACK) feedback for the at least one MAC-CE via a fourth set of resources associated with the first cell.

11 . The UE of claim 10 , wherein, to output the aperiodic CSI report, the processing system is further configured to:
output the aperiodic CSI report via a set of physical uplink shared channel (PUSCH) resources in accordance with a time offset between the set of PUSCH resources and the fourth set of resources, wherein the at least one MAC-CE that triggers the aperiodic CSI reporting indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

12 . The UE of claim 1 , wherein, to output the aperiodic CSI report, the processing system is further configured to:
output the aperiodic CSI report via a set of physical uplink shared channel (PUSCH) resources in accordance with a time offset between the set of PUSCH resources and the second set of resources, wherein the at least one MAC-CE that triggers the aperiodic CSI reporting indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

13 . The UE of claim 1 , wherein, to obtain the one or more aperiodic reference signals via the second set of resources, the processing system is further configured to
measure channel state information (CSI) via at least one aperiodic channel measurement resource (CMR) or interference measurement resource (IMR) associated with the second cell.

14 . The UE of claim 1 , wherein the processing system is further configured to
obtain downlink scheduling information associated with the second cell in accordance with the aperiodic CSI report from the apparatus; and obtain, via the second cell, at least one downlink message in accordance with the downlink scheduling information.

15 . The UE of claim 1 , wherein, to output the aperiodic CSI report, the processing system is further configured to:
output the aperiodic CSI report via a set of physical uplink shared channel (PUSCH) resources associated with at least one of the first cell, the second cell, or a third cell that is activated for the apparatus.

16 . A network entity for wireless communication, comprising:
a processing system that includes one or more processors and one or more code-storing memories coupled with the one or more processors, the processing system configured to cause the network entity to:
output, via a first set of resources associated with a first cell, at least one medium access control (MAC)-control element (CE) that activates a second cell and triggers aperiodic channel state information (CSI) reporting for the second cell;
output, in accordance with the at least one MAC-CE, one or more aperiodic reference signals via a second set of resources associated with the second cell; and
obtain an aperiodic CSI report associated with a measurement of the one or more aperiodic reference signals.

17 . The network entity of claim 16 , wherein, to output the at least one MAC-CE, the processing system is further configured to:
output, via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, a

Assignees

• Qualcomm Inc

Inventors

• Ryu Jae Ho
• Takeda Kazuki
• Park Changhwan
• Sankar Hari

Classifications

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04L5/0051 Primary

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W72/1268

  of uplink data flows · CPC title

• H04L1/1858

  Transmission or retransmission of more than one copy of acknowledgement message · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title