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WO2025145707A1 - Acquisition précoce de csi pour mobilité déclenchée de couche l1/l2 - Google Patents

Acquisition précoce de csi pour mobilité déclenchée de couche l1/l2 Download PDF

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Publication number
WO2025145707A1
WO2025145707A1 PCT/CN2024/123048 CN2024123048W WO2025145707A1 WO 2025145707 A1 WO2025145707 A1 WO 2025145707A1 CN 2024123048 W CN2024123048 W CN 2024123048W WO 2025145707 A1 WO2025145707 A1 WO 2025145707A1
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WIPO (PCT)
Prior art keywords
csi
wideband
network entity
processor
cell
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English (en)
Inventor
Bingchao LIU
Chenxi Zhu
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Lenovo Beijing Ltd
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Lenovo Beijing Ltd
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Priority to PCT/CN2024/123048 priority Critical patent/WO2025145707A1/fr
Publication of WO2025145707A1 publication Critical patent/WO2025145707A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • the present disclosure relates to wireless communications, and more specifically to a user equipment (UE) , a network entity, a processor for wireless communication, methods, and computer readable media for early channel state information (CSI) acquisition for L1/L2 triggered mobility (LTM) .
  • UE user equipment
  • network entity a network entity
  • processor for wireless communication
  • methods and computer readable media for early channel state information (CSI) acquisition for L1/L2 triggered mobility (LTM) .
  • CSI channel state information
  • LTM L1/L2 triggered mobility
  • a wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology.
  • Each network communication devices such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology.
  • the wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) .
  • the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
  • 3G third generation
  • 4G fourth generation
  • 5G fifth generation
  • 6G sixth generation
  • L1/L2 triggered mobility is specified in new radio (NR) Rel-18 to reduce the handover latency compared with the traditional L3 triggered mobility.
  • the source cell can configure a UE to measure synchronization signal blocks (SSBs) associated with neighboring cells and report the measurement results for the source cell to determine whether to trigger a handover procedure in medium access control (MAC) layer.
  • SSBs synchronization signal blocks
  • MAC medium access control
  • the present disclosure relates to a user equipment (UE) , a network entity, a processor for wireless communication, methods, and computer readable media for early CSI acquisition for LTM.
  • UE user equipment
  • a UE comprises: a processor; and a transceiver coupled to the processor, wherein the processor is configured to: receive, from a network entity, a channel state information (CSI) report configuration for wideband CSI reporting based on measurement on CSI-RS resources associated with one or more candidate cells; and transmit, to the network entity, a CSI report including at least one of wideband channel quality indicator (CQI) , rank indicator (RI) or wideband precoding matrix indicator (PMI) for the one or more candidate cells.
  • CQI wideband channel quality indicator
  • RI rank indicator
  • PMI wideband precoding matrix indicator
  • a network entity comprises: a processor; and a transceiver coupled to the processor, wherein the processor is configured to: transmit, to a user equipment (UE) , a channel state information (CSI) report configuration for wideband CSI reporting based on measurement on CSI-RS resources associated with one or more candidate cells; and receive, from the UE, a CSI report including at least one of wideband channel quality indicator (CQI) , rank indicator (RI) or wideband precoding matrix indicator (PMI) for the one or more candidate cells.
  • CQI wideband channel quality indicator
  • RI rank indicator
  • PMI wideband precoding matrix indicator
  • a processor for wireless communication comprises: at least one memory; and a controller coupled with the at least one memory and configured to cause the controller to: receive, from a network entity , a channel state information (CSI) report configuration for wideband CSI reporting based on measurement on CSI-RS resources associated with one or more candidate cells; and transmit, to the network entity, a CSI report including at least one of wideband channel quality indicator (CQI) , rank indicator (RI) or wideband precoding matrix indicator (PMI) for the one or more candidate cells.
  • CQI wideband channel quality indicator
  • RI rank indicator
  • PMI wideband precoding matrix indicator
  • a method performed by a user equipment comprising: receiving, from a network entity, a channel state information (CSI) report configuration for wideband CSI reporting based on measurement on CSI-RS resources associated with one or more candidate cells; and transmitting, to the network entity, a CSI report including at least one of wideband channel quality indicator (CQI) , rank indicator (RI) or wideband precoding matrix indicator (PMI) for the one or more candidate cells.
  • CSI channel state information
  • a computer readable medium having instructions stored thereon, the instructions, when executed by a processor of an apparatus, causing the apparatus to perform the method according to the fourth or the fifth aspect of the disclosure.
  • At least one CSI-RS resource for the CSI report is activated when one or more joint or downlink (DL) transmission configuration indicator (TCI) states are activated for a candidate cell.
  • DL downlink
  • TCI transmission configuration indicator
  • the at least one CSI-RS resource is transmitted with multiple ports from the candidate cell.
  • each of the at least one CSI-RS resource is activated in association with an activated joint or DL TCI state of the candidate cell by a activation media access control (MAC) control element (MAC CE) .
  • MAC media access control
  • the CSI report is transmitted to a serving cell before reception of a cell switch command.
  • the UE may further receive, from the network entity, a cell switch command indicating one of the candidate cells as a target cell, wherein the cell switch command includes a field to trigger CSI measurement and CSI reporting on the target cell.
  • the CSI report is carried by the first uplink (UL) transmission in the target cell.
  • the cell switch command further triggers an aperiodic CSI-RS transmission associated with the CSI report.
  • the cell switch command further activates a semi-persistent CSI-RS transmission associated with the CSI report.
  • the UE and the network entity described herein may apply an indicated joint or DL TCI state in the cell switch command for reception of a non-zero power (NZP) CSI-RS resource set and a CSI-interference measurement (CSI-IM) resource set associated with the CSI report configuration.
  • NZP non-zero power
  • CSI-IM CSI-interference measurement
  • Type I single-panel or type I multi-panel codebook is configured for the wideband PMI report for the CSI report configuration.
  • FIG. 1 illustrates an example of a wireless communications system in which some embodiments of the present disclosure can be implemented.
  • FIG. 2 illustrates a process flow for early CSI acquisition for LTM in accordance with some example embodiments of the present disclosure.
  • FIG. 3 illustrates a schematic diagram of a timeline for CSI acquisition before cell switching in accordance with some example embodiments of the present disclosure.
  • FIG. 4 illustrates an example of a candidate cell TCI state activation/deactivation MAC CE for CSI-RS/CSI-IM activation for CSI acquisition in accordance with some example embodiments of the present disclosure.
  • FIG. 5 illustrates a schematic diagram of CSI reporting to a serving cell in accordance with some example embodiments of the present disclosure.
  • FIG. 6 illustrates a schematic diagram of a timeline for CSI acquisition during cell switching in accordance with some example embodiments of the present disclosure.
  • FIG. 7 illustrates a schematic diagram of CSI reporting to a target cell in accordance with some example embodiments of the present disclosure.
  • FIG. 8 illustrates a schematic diagram of a timeline for the CSI acquisition during cell switching in accordance with some example embodiments of the present disclosure.
  • FIG. 9 illustrates an example of a device that is suitable for implementing some embodiments of the present disclosure.
  • FIG. 10 illustrates an example of a processor that is suitable for implementing some embodiments of the present disclosure.
  • FIG. 11 illustrates a flowchart of a method that performed by a UE in accordance with aspects of the present disclosure.
  • FIG. 12 illustrates a flowchart of a method that performed by a network entity in accordance with aspects of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms. In some examples, values, procedures, or apparatuses are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • the term “includes” and its variants are to be read as open terms that mean “includes, but is not limited to. ”
  • the term “based on” is to be read as “based at least in part on. ”
  • the term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ”
  • the term “another embodiment” is to be read as “at least one other embodiment. ”
  • the use of an expression such as “A and/or B” can mean either “only A” or “only B” or “both A and B. ”
  • Other definitions, explicit and implicit, may be included below.
  • a UE can be configured with one or more LTM CSI report configurations (e.g., configured by higher layer information element (IE) LTM-CSI-ReportConfig) to measure the beam qualities of candidate cells.
  • LTM CSI report configurations e.g., configured by higher layer information element (IE) LTM-CSI-ReportConfig
  • SSB or CSI-RS resources for beam management e.g., CSI-RS resources with a single port, from candidate cells can be configured as the channel measurement resource (CMR) for L1-reference signal receive power (RSRP) measurement and reporting.
  • the network (NW) may send a MAC CE to activate some of the transmission configuration indicator (TCI) states associated with high quality beams of a candidate cell for potential cell switching.
  • TCI transmission configuration indicator
  • the NW can trigger the UE to perform the CSI measurement based on CSI-RS resources with multiple ports for the candidate cells with activated or indicated TCI states.
  • embodiments of the disclosure provide two schemes on the early CSI acquisition for LTM before cell switch command and after cell switch command, respectively.
  • FIG. 1 illustrates an example of a wireless communications system 100 in which some embodiments of the present disclosure can be implemented.
  • the wireless communications system 100 may include one or more network entities 102 (also referred to as network equipment (NE) ) , one or more UEs 104, a core network 106, and a packet data network 108.
  • the wireless communications system 100 may support various radio access technologies.
  • the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network.
  • LTE-A LTE-Advanced
  • the wireless communications system 100 may be a 5G network, such as an NR network.
  • the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20.
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • CDMA code division multiple access
  • the one or more network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100.
  • One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN) , a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology.
  • RAN radio access network
  • eNB eNodeB
  • gNB next-generation NodeB
  • a network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection.
  • a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
  • a network entity 102 in form of a satellite can directly communicate to UE 104 using NR/LTE Uu interface.
  • the satellite may be a transparent satellite or a regenerative satellite.
  • a base station on earth may communicate with a UE via the satellite.
  • the base station may be on board and directly communicate with the UE.
  • a network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112.
  • a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies.
  • a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network.
  • different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102.
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • the one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100.
  • a UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology.
  • the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples.
  • the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
  • IoT Internet-of-Things
  • IoE Internet-of-Everything
  • MTC machine-type communication
  • a UE 104 may be stationary in the wireless communications system 100.
  • a UE 104 may be mobile in the wireless communications system 100.
  • a UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114.
  • a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link.
  • D2D device-to-device
  • the communication link 114 may be referred to as a sidelink.
  • a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
  • a network entity 102 may support communications with the core network 106, or with another network entity 102, or both.
  • a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) .
  • the network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) .
  • the network entities 102 may communicate with each other directly (e.g., between the network entities 102) .
  • the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) .
  • one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) .
  • An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .
  • TRP transmission-reception point
  • the term “TRP” refers to a transmission-reception point having an antenna array (with one or more antenna elements) at the network side located at a specific geographical location, which may be used for transmitting and receiving signals to/from the terminal device.
  • a TRP may refer to Macro Cell, micro cell, an RRH, a relay, a femto node, a pico node, etc.
  • An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) .
  • One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) .
  • one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
  • VCU virtual CU
  • VDU virtual DU
  • VRU virtual RU
  • Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU.
  • functions e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof
  • a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack.
  • FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) .
  • FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) .
  • the UE 201 may only need to perform CSI acquisition for a candidate cell when it is identified as a potential target cell. Thus, only semi-persistent or aperiodic CSI measurement and report on one or more target cell is supported for LTM.
  • the UE 210 transmits, to network entity 202, a CSI report 235 including at least one of wideband (WB) channel quality indicator (CQI) , rank indicator (RI) or wideband precoding matrix indicator (PMI) for the one or more candidate cells.
  • WB wideband
  • CQI channel quality indicator
  • RI rank indicator
  • PMI wideband precoding matrix indicator
  • the network entity 202 receives the CSI report 235 from the UE 201.
  • the UE 201 may be configured to report wideband (WB) CSI including WB CQI, RI and/or WB PMI.
  • WB wideband
  • the codebook type may be configured to typeI-SinglePanel or typeI-MultiPanel. The codebook is used for the UE to select one or more PMI for reporting.
  • the higher layer parameter reportQuantity may be set to “cri-RI-PMI-CQI” , “cri-RI-LI-PMI-CQI” , “cri-RI-CQI” or “cri-RI-i1-CQI” or “cri-RI-i1, ” and the corresponding parameter cqi-FormatIndicator may be set to widebandCQI, and pmi-FormatIndicator can be set to widebandPMI.
  • cri-RI-PMI-CQI The definition of “cri-RI-PMI-CQI” , “cri-RI-LI-PMI-CQI” , “cri-RI-CQI” or “cri-RI-i1-CQI” or “cri-RI-i1, ” can be found in 3GPP TS38.214 V18.0.0.
  • An example of the CSI report format carrying the wideband CSI is shown in Table 1 below which is the same as Table 6.3.1.1.2-7 specified in 3GPP TS38.212 V18.0.0.
  • Table 1 Mapping order of CSI fields of one CSI report with wideband PMI and wideband CQI
  • FIG. 3 illustrates a schematic diagram of a timeline for CSI acquisition before cell switching in accordance with some example embodiments of the present disclosure.
  • the UE 201 may only be required to perform CSI measurement on some beams which may be indicated as the beam for the data transmission in the target cell to limit the UE complexity.
  • the CSI-RS resource (s) for the CSI report may be activated when one or more joint or DL TCI states are activated for a candidate cell. Accordingly, the UE 201 only needs to perform CSI measurement on CSI-RS resource associated with the beam (s) that are activated for the candidate cell.
  • each beam corresponding to a joint or DL TCI state which is used for the UE to determine the spatial Rx filter parameters, i.e., Rx beams, for DL reception.
  • the network entity 202 may indicate at t 1 , using an enhanced TCI state activation MAC CE, the UE 201 to perform CSI measurement on candidate cell (s) before cell switching and after or along with some TCI states are activated to some candidate cells.
  • the serving cell may activate one non-zero power (NZP) CSI-RS resource or one NZP CSI-RS resource set associated with a activated joint or DL TCI state for CSI measurement on the corresponding beam, using an enhanced MAC CE which can activate TCI state (s) for a candidate cell candidate cell and the CSI-RS resources or CSI-RS resource sets for CSI acquisition.
  • NZP non-zero power
  • FIG. 4 illustrates an example of a candidate cell TCI state activation/deactivation MAC CE for CSI-RS/CSI-IM activation for CSI acquisition in accordance with some example embodiments of the present disclosure.
  • the enhanced MAC CE has the following fields:
  • This field indicates the identity of an LTM candidate cell for which the MAC CE applies;
  • This field indicates whether each TCI codepoint has multiple TCI states or a single TCI state. If the Pi field is set to 1, the i-th TCI codepoint includes the DL TCI state and the UL TCI state. If the Pi field is set to 0, the i-th TCI codepoint includes only the DL/joint TCI state or the UL TCI state. The codepoint to which a TCI state is mapped is determined by its ordinal position among all the TCI state ID fields;
  • This field indicates whether there is a CSI-RS resource of CSI-RS resource set is activated or triggered for the activated joint/downlink TCI state for the i-th TCI codepoint. When there is no joint/downlink TCI state or there is only UL TCI state is activated to the i-th TCI codepoint, the corresponding Ci field is reserved.
  • This field indicates whether the TCI state ID in the same octet is for a joint/downlink or an uplink TCI state. If this field is set to 1, the TCI state ID in the same octet is for joint/downlink TCI state. If this field is set to 0, the TCI state ID in the same octet is for uplink TCI state;
  • TCI state ID This field indicates the TCI state identified by TCI-StateId in ltm-DL-OrJointTCI-StateToAddModList or TCI-UL-StateId in ltm-UL-TCI-StatesToAddModList. If D/U is set to 1, 7-bits length TCI state ID i.e. TCI-StateId as specified in TS 38.331 is used.
  • TCI state ID is considered as the reserved bit and remaining 6 bits indicate the TCI-UL-StateId; ltm-DL-OrJointTCI-StateToAddModList, ltm-UL-TCI-StatesToAddModList, TCI-UL-StateId and TCI-StateId are specified in TS38.331 V18.2.0.
  • This field contains an index of NZP-CSI-RS-ResourceSet containing NZP CSI-RS resources, indicating the NZP CSI-RS resource set, which shall be activated. Or an index of NZP-CSI-RS-Resource indicating the NZP CSI-RS resource shall be activated.
  • the CSI-RS resource or CSI-RS resource set comprises a set of semi-persistent CSI-RS resources.
  • the UE shall use the joint/DL TCI state for the corresponding NZP CSI-RS resource set or NZP CSI-RS resource reception.
  • This field indicates the presence of the octet containing SP CSI-IM resource set ID field. If the IM field is set to 1, the octet containing SP CSI-IM resource set ID field is present. If IM field is set to 0, the octet containing SP CSI-IM resource set ID field is not present;
  • This field contains an index of CSI-IM-ResourceSet containing Semi Persistent CSI-IM resources, as specified in TS 38.331, indicating the Semi Persistent CSI-IM resource set, which shall be activated or deactivated.
  • the CSI-IM resource or CSI-IM resource set is used for interference measurement;
  • semi-persistent or aperiodic CSI report can be activated or triggered based on the measurement on the activated CSI-RS resources and the CSI-IM resources.
  • the UE 201 may transmit the CSI report to a serving cell before reception of a cell switch command at t 2 .
  • FIG. 5 illustrates a schematic diagram of CSI reporting to a serving cell in accordance with some example embodiments of the present disclosure.
  • the CSI report is sent to the serving cell, then the serving cell sends the CSI report for different candidate cells to the corresponding candidate cells via the F1 interface between the CU and DU (s) when the serving cell and candidate cells belong to different DUs while those DUs belong to a same Cu, i.e., the intra-CU inter DU deployment.
  • FIG. 6 illustrates a schematic diagram of another timeline for CSI acquisition during cell switching in accordance with some example embodiments of the present disclosure.
  • the UE 201 may only perform CSI acquisition on the single beam that is indicated in the cell switch command.
  • the UE 201 may perform L1-RSRP measurement on the CSI-RS resources for candidate cells and report L1-RSRPs to the serving cell.
  • the serving cell indicates the UE 201 to switch to a target cell by transmitting a cell switch command.
  • the cell switch command may be used for the CSI acquisition and report triggering.
  • the cell switch command may also activate aperiodic or semi-persistent CSI-RS transmission for CSI measurement.
  • the UE 201 may be configured with one or more aperiodic LTM CSI report configuration (LTM-CSI-ReportConfig) with the higher layer parameter reportQuantity, which can be set to “cri-RI-PMI-CQI” , “cri-RI-LI-PMI-CQI” , “cri-RI-CQI” or “cri-RI-i1-CQI” or “cri-RI-i1” .
  • LTM-CSI-ReportConfig may be associated or mapped to a non-zero CSI request field codepoint contained in the enhanced cell switch command MAC CE.
  • the associated NZP CSI-RS resource set and CSI-IM resource set for channel and interference may be semi-persistent or aperiodic.
  • aperiodic or semi-persistent CSI-RS and the associated CSI-IM can be used for the CSI measurement.
  • the UE 201 may apply an indicated joint or DL TCI state which is indicated by the cell switch command for reception of the NZP CSI-RS resource set and a CSI-IM resource set associated with the CSI report configuration.
  • FIG. 7 illustrates a schematic diagram of CSI reporting to a target cell in accordance with some example embodiments of the present disclosure.
  • the CSI report is transmitted to the target cell after the UE 201 has switched to the target cell.
  • the CSI report may be carried in the first physical uplink shared channel (PUSCH) transmission in the target cell.
  • PUSCH physical uplink shared channel
  • FIG. 8 illustrates a schematic diagram of a timeline for the CSI acquisition during cell switching in accordance with some example embodiments of the present disclosure.
  • a receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium.
  • the receive chain may include one or more antennas 910 for receive the signal over the air or wireless medium.
  • the receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal.
  • the receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal.
  • the receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
  • the processor 1000 may implemented at a network entity 102, e.g. a base station.
  • the processor 1000 may be configured to operable to support means for transmitting, to a user equipment (UE) , a channel state information (CSI) report configuration for wideband CSI reporting based on measurement on CSI-RS resources associated with one or more candidate cells; and means for receiving, from the UE, a CSI report including at least one of wideband channel quality indicator (CQI) , rank indicator (RI) or wideband precoding matrix indicator (PMI) for the one or more candidate cells.
  • CQI wideband channel quality indicator
  • RI rank indicator
  • PMI wideband precoding matrix indicator
  • the method may include receiving, from a network entity, a channel state information (CSI) report configuration for wideband CSI reporting based on measurement on CSI-RS resources associated with one or more candidate cells.
  • CSI channel state information
  • the operations of 1110 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1110 may be performed by a UE 104 as described with reference to FIG. 1.
  • the method may include transmitting, to the network entity, a CSI report including at least one of wideband channel quality indicator (CQI) , rank indicator (RI) or wideband precoding matrix indicator (PMI) for the one or more candidate cells.
  • CQI wideband channel quality indicator
  • RI rank indicator
  • PMI wideband precoding matrix indicator
  • FIG. 12 illustrates a flowchart of a method 1200 performed by a network entity in accordance with aspects of the present disclosure.
  • the operations of the method 1200 may be implemented by a device or its components as described herein.
  • the operations of the method 1200 may be performed by a network entity 102 as described herein.
  • the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
  • the method may include transmitting, to a user equipment (UE) , a channel state information (CSI) report configuration for wideband CSI reporting based on measurement on CSI-RS resources associated with one or more candidate cells.
  • UE user equipment
  • CSI channel state information
  • the operations of 1210 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1210 may be performed by a network entity 102 as described with reference to FIG. 1.
  • the method may include receiving, from the UE, a CSI report including at least one of wideband channel quality indicator (CQI) , rank indicator (RI) or wideband precoding matrix indicator (PMI) for the one or more candidate cells.
  • CQI wideband channel quality indicator
  • RI rank indicator
  • PMI wideband precoding matrix indicator
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
  • non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements.
  • the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable.
  • a list of items indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) .
  • the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure.
  • the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.
  • a “set” may include one or more elements.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Divers aspects de la présente divulgation concernent un UE, un processeur pour permettre une communication sans fil, une entité de réseau et des procédés d'acquisition précoce de CSI pour une mobilité déclenchée de couche L1/L2. Dans un procédé donné à titre d'exemple, l'UE reçoit, d'une entité de réseau, une configuration de rapport de CSI pour un rapport de CSI à large bande sur la base d'une mesure faite sur des ressources de CSI-RS associées à une ou plusieurs cellules candidates ; et transmet, à l'entité de réseau, un rapport de CSI comprenant des CQI à large bande, un RI et/ou un PMI à large bande pour la ou les cellules candidates. Ceci permet d'obtenir un plus grand débit sur une cellule cible succédant immédiatement à un commutateur de cellule déclenché par une commande de commutation de cellule LTM.
PCT/CN2024/123048 2024-09-30 2024-09-30 Acquisition précoce de csi pour mobilité déclenchée de couche l1/l2 Pending WO2025145707A1 (fr)

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