US-20260129532-A1 - METHODS, ARCHITECTURES, APPARATUSES AND SYSTEMS FOR ASYNCHRONOUS REPORTING OF CHANNEL STATE INFORMATION

US20260129532A1US 20260129532 A1US20260129532 A1US 20260129532A1US-20260129532-A1

Abstract

A wireless transmit/receive unit (WTRU) may initiate, for each cell of a set of candidate cells, one or more channel state information (CSI) measurements using a set of resources associated with the respective cell. The WTRU may initiate a cell switch, or handover, to a target cell. The WTRU may transmit, based on the target cell being a candidate cell of the set and using a first available uplink resource in the target cell, information indicating the one or more CSI measurements were initiated for the target cell. The WTRU may, after completion of the one or more CSI measurements which were initiated for the target cell, transmit, using a second available uplink resource, information indicating that measurement information associated with the one or more CSI measurements for the target cell is available based on the second available uplink resource having an insufficient payload to carry the measurement information.

Inventors

Paul Marinier
Ghyslain Pelletier
Samuli Turtinen
Moon Il Lee

Assignees

INTERDIGITAL PATENT HOLDINGS, INC.

Dates

Publication Date: 20260507
Application Date: 20241104

Claims (20)

1 . A wireless transmit/receive unit (WTRU) comprising: a processor, memory, and a transceiver which are configured to: initiate, for each candidate cell of a set of candidate cells, one or more channel state information (CSI) measurements using a set of resources associated with the respective candidate cell, initiate a cell switch to a target cell, transmit, based on the target cell being a candidate cell of the set of candidate cells and using a first available uplink resource in the target cell, information indicating the one or more CSI measurements were initiated for the target cell, and after completion of the one or more CSI measurements which were initiated for the target cell, transmit, using a second available uplink resource, information indicating that measurement information associated with the one or more CSI measurements for the target cell is available based on the second available uplink resource having an insufficient payload to carry the measurement information.
2 . A wireless transmit/receive unit (WTRU) comprising: a processor, memory, and a transceiver which are configured to: initiate, for each candidate cell of a set of candidate cells, one or more channel state information (CSI) measurements using a set of resources associated with the respective candidate cell, initiate a cell switch to a target cell, transmit, based on the target cell being a candidate cell of the set of candidate cells and using a first available uplink resource in the target cell, information indicating the one or more CSI measurements were initiated for the target cell, and after completion of the one or more CSI measurements which were initiated for the target cell, transmit, using a second available uplink resource, information indicating measurement information associated with the one or more CSI measurements for the target cell based on the second available uplink resource having a sufficient payload to carry the measurement information.
3 . The WTRU of claim 2 , wherein the processor, memory, and the transceiver are configured to initiate, for each candidate cell of the set of candidate cells, the one or more CSI measurements based on one or more triggering conditions.
4 . The WTRU of claim 2 , wherein the processor, memory, and the transceiver are configured to complete the one or more CSI measurements which were initiated for the target cell after initiating the cell switch to the target cell, and wherein each of the one or more CSI measurements are performed using a CSI reference resource occasion.
5 . The WTRU of claim 2 , wherein the processor, memory, and the transceiver are configured to determine whether or not the second available uplink resource has a sufficient payload to carry the measurement information.
6 . The WTRU of claim 2 , wherein the information indicating the one or more CSI measurements were initiated for the target cell is transmitted in a payload of a message of a random access procedure.
7 . The WTRU of claim 2 , wherein the processor, memory, and the transceiver are configured to determine to stop, for at least one candidate cell of the set of candidate cells, the one or more CSI measurements based on one or more triggering conditions.
8 . The WTRU of claim 2 , wherein the processor, memory, and the transceiver are configured to transmit, based on the target cell being the candidate cell of the set of candidate cells and using the first available uplink resource in the target cell, information indicating whether or not the measurement information associated with the one or more CSI measurements for the target cell is available.
9 . The WTRU of claim 2 , wherein the processor, memory, and the transceiver are configured to transmit, based on the target cell being the candidate cell of the set of candidate cells and using the first available uplink resource in the target cell, information indicating a time at which the measurement information associated with the one or more CSI measurements for the target cell will be available.
10 . The WTRU of claim 2 , wherein the processor, memory, and the transceiver are configured to transmit, based on the target cell being the candidate cell of the set of candidate cells and using the first available uplink resource in the target cell, information indicating an identifier and/or resources associated with the one or more CSI measurements for the target cell.
11 . (canceled)
12 . A method implemented by a wireless transmit/receive unit (WTRU), the method comprising: initiating, for each candidate cell of a set of candidate cells, one or more channel state information (CSI) measurements using a set of resources associated with the respective candidate cell; initiating a cell switch to a target cell; transmitting, based on the target cell being a candidate cell of the set of candidate cells and using a first available uplink resource in the target cell, information indicating the one or more CSI measurements were initiated for the target cell; and after completion of the one or more CSI measurements which were initiated for the target cell, transmitting, using a second available uplink resource, information indicating measurement information associated with the one or more CSI measurements for the target cell based on the second available uplink resource having a sufficient payload to carry the measurement information.
13 . The method of claim 12 , wherein the one or more CSI measurements are initiated, for each candidate cell of the set of candidate cells, based on one or more triggering conditions.
14 . The method of claim 12 , wherein the one or more CSI measurements which were initiated for the target cell are completed after initiating the cell switch to the target cell, and wherein each of the one or more CSI measurements are performed using a CSI reference resource occasion.
15 . The method of claim 12 , further comprising: determining whether or not the second available uplink resource has a sufficient payload to carry the measurement information.
16 . The method of claim 12 , wherein the information indicating the one or more CSI measurements were initiated for the target cell is transmitted in a payload of a message of a random access procedure.
17 . The method of claim 12 , wherein the one or more CSI measurements are stopped for at least one candidate cell of the set of candidate cells based on one or more triggering conditions.
18 . The method of claim 12 , further comprising: transmitting, based on the target cell being the candidate cell of the set of candidate cells and using the first available uplink resource in the target cell, information indicating whether or not the measurement information associated with the one or more CSI measurements for the target cell is available.
19 . The method of claim 12 , further comprising: transmitting, based on the target cell being the candidate cell of the set of candidate cells and using the first available uplink resource in the target cell, information indicating a time at which the measurement information associated with the one or more CSI measurements for the target cell will be available.
20 . The method of claim 12 , further comprising: transmitting, based on the target cell being the candidate cell of the set of candidate cells and using the first available uplink resource in the target cell, information indicating an identifier and/or resources associated with the one or more CSI measurements for the target cell.

Description

BACKGROUND The present application is related to the fields of communications, software and encoding, including, for example, to methods, architectures, apparatuses, systems directed to asynchronous reporting of channel state information (CSI). 3GPP 5G New Radio (NR) specifies different mechanisms for the measurement and reporting of CSI. In periodic CSI reporting, for example, a wireless transmit/receive unit (WTRU) reports on resources that recur periodically. In semi-persistent CSI reporting, a WTRU starts reporting on resources that recur periodically after reception of an activation command. In aperiodic CSI reporting, a WTRU reports once on a resource indicated by downlink control information (DCI). A WTRU needs a minimum amount of time to compute the CSI, such as after receiving a DCI indicating a CSI request. A first issue is that uplink scheduling is generally slowed down when the network requests aperiodic CSI. A second issue is that it takes time for the network to obtain detailed CSI information after handover (or cell switch) since the request is performed only after the WTRU has connected to the target cell. There is a need to provide procedures which support a WTRU to determine when to report a set of CSI results and/or which (sub)set of CSI results to include in a report. BRIEF SUMMARY Briefly stated, in one embodiment, a WTRU may execute a cell switch on a target cell and indicate if CSI results are or will be available for this target cell based on whether the WTRU had initiated CSI measurements associated with the target cell before the cell switch. In one embodiment, a WTRU may initiate, for each candidate cell of a set of candidate cells, one or more CSI measurements using a set of resources associated with the respective candidate cell. The WTRU may initiate a cell switch (or handover) to a target cell. The WTRU may transmit, based on the target cell being a candidate cell of the set of candidate cells and using a first available uplink resource in the target cell, information indicating the one or more CSI measurements were initiated for the target cell. The WTRU may, after completion of the one or more CSI measurements which were initiated for the target cell, transmit, using a second available uplink resource, information indicating that measurement information associated with the one or more CSI measurements for the target cell is available based on the second available uplink resource having an insufficient payload to carry the measurement information. In one embodiment, a WTRU may initiate, for each candidate cell of a set of candidate cells, one or more CSI measurements using a set of resources associated with the respective candidate cell. The WTRU may initiate a cell switch to a target cell. The WTRU may transmit, based on (e.g., determining that) the target cell being (e.g., is) a candidate cell of the set of candidate cells and using a first available uplink resource in the target cell, information indicating the one or more CSI measurements were initiated for the target cell. After completion of the one or more CSI measurements which were initiated for the target cell, the WTRU may transmit, using a second available uplink resource, information indicating that measurement information associated with the one or more CSI measurements for the target cell is available based on the second available uplink resource having an insufficient payload to carry the measurement information. In one embodiment, a WTRU may initiate, for each candidate cell of a set of candidate cells, one or more CSI measurements using a set of resources associated with the respective candidate cell. The WTRU may initiate a cell switch to a target cell. The WTRU may transmit, based on (e.g., determining that) the target cell being (e.g., is) a candidate cell of the set of candidate cells and using a first available uplink resource in the target cell, information indicating the one or more CSI measurements were initiated for the target cell. After completion of the one or more CSI measurements which were initiated for the target cell, the WTRU may transmit, using a second available uplink resource, information indicating measurement information associated with the one or more CSI measurements for the target cell based on the second available uplink resource having a sufficient payload to carry the measurement information. In one embodiment, a WTRU may initiate, for a set of candidate cells, CSI measurements using resource occasions associated with the candidate cells. The WTRU may initiate a cell switch or a handover to a target cell. The WTRU may transmit, using a first uplink resource in the target cell, information indicating one or more of the CSI measurements were initiated for the target cell based on the target cell being one of the candidate cells. The WTRU may, after completion of the one or more of the CSI measurements which were initiated for the target cell, transmit, using a second uplink resour