Cell measurements and reporting for cell switch

Abstract

The present disclosure relate to the field of telecommunication and in particular to devices, methods, apparatuses and computer readable storage media for enabling cell measurements and reporting for cell switching For example, there is provided a user device comprising at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the user device at least to: obtain a channel state information, CSI, report configuration; perform at least one first CSI measurement on the at least one first resource set; select one or more resource sets from the at least one second resource set based on the at least one first CSI measurement and at least one criterion; perform at least one second CSI measurement on the selected one or more second resource sets; and transmit the CSI report including the at least one second CSI measurement to a network device using the uplink resources.

Description

CELL MEASUREMENTS AND REPORTING FOR CELL SWITCHFIELD

[0001] Embodiments of the present disclosure relate to the field of telecommunication and in particular to devices, methods, apparatuses and computer readable storage media for enabling cell measurements and reporting for cell switching.BACKGROUND

[0002] In the handover types until Rel-17 of 3GPP, a serving cell change is triggered by layer 3 (L3) measurements and is done by RRC signalling for change of primary cell (PCell) and / or primary secondary cell (PSCell). All cases require reconfiguration of upper layers (e.g., RRC or PDCP) and / or resetting of lower layers (e.g., MAC and / or PHY) which leads to longer latency, larger overhead and longer interruption time than beam level mobility. Rel- 18 of 3GPP has introduced layer 1 (LI) / layer 2 (L2) based mobility also known as a lower layer triggered mobility (LTM) to enable a serving cell change via L1 / L2 signalling, while keeping configuration of the upper layers and / or minimizing changes of configuration of the lower layers. This helps to reduce the latency, overhead and interruption time during handover. The LTM supports both intra-distributed unit (DU) and intra-central unit (CU)-inter-DU mobility. During the LTM, the user plane is continued whenever possible (e.g. intra-DU), without reset, with the target cell to avoid data loss and the additional delay of data recovery.SUMMARY

[0003] The scope of protection sought for various example embodiments is set out by the claims. The example embodiments and features, if any, described in this specification that do not fall under the scope of the claims are to be interpreted as examples useful for understanding various embodiments.

[0004] In a first aspect, there is provided an user device comprising at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the user device at least to: obtain a channel state information (CSI) report configuration comprising a first list indicating at least one first resource set associated with first reference signals of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and informationindicative of uplink resources for a CSI report; perform at least one first CSI measurement on the at least one first resource set; select one or more resource sets from the at least one second resource set based on the at least one first CSI measurement and at least one criterion; perform at least one second CSI measurement on the selected one or more second resource sets; and transmit the CSI report including the at least one second CSI measurement to a network device using the uplink resources.

[0005] Other features and advantages of the embodiments of the present disclosure will also be apparent from the following description of specific embodiments when read in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of embodiments of the disclosure.BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Embodiments of the disclosure are presented in the sense of examples and their advantages are explained in greater detail below, with reference to the accompanying drawings.

[0007] FIG. 1 A illustrates an example of a wireless communication network;

[0008] FIG. IB illustrates an example of a system;

[0009] FIG. 2 illustrates the LTM procedure.

[0010] FIG. 3 illustrates the LI measurement configuration that may be applied to the embodiments of the disclosure.

[0011] FIG. 4 illustrates the main components of Rel-18 LTM configuration and how they are placed.

[0012] FIG. 5 illustrates an example of the CSLRSs quasi collocated with SSBs.

[0013] FIG. 6 illustrates the examples related to multiple resource sets for a CSI report configuration.

[0014] FIG. 7 illustrates an embodiment of configuring multiple resource sets for a CSI report configuration.

[0015] Fig. 8 illustrates other embodiment of configuring multiple resource sets for CSI report configuration.

[0016] FIG. 9 illustrates an embodiment of configuring multiple report configurationshaving the same uplink resource for transmitting or receiving a CSI report configuration.

[0017] FIG. 10 illustrates the other embodiment of configuring multiple report configurations having the same uplink resource for transmitting or receiving a CSI report configuration.

[0018] FIG. 11 illustrates an example of an apparatus.

[0019] FIG. 12 illustrates an example of an apparatus.

[0020] Throughout the drawings, the same or similar reference numerals may represent the same or similar element.DETAILED DESCRIPTION

[0021] The following embodiments are exemplifying. Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein may be implemented in various manners other than the ones described below.

[0022] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein may have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.

[0023] References in the present disclosure to “one embodiment,” “an embodiment,” “an example embodiment,” and the like indicate that the embodiment described may include a particular feature, structure, element or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, element or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. 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, element or characteristic in connection with other embodiments whether or not explicitly described.

[0024] It shall be understood that although the terms “first,” “second” and the like 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. For example, a firstelement could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.

[0025] As used herein, “at least one of the following: ” and “at least one of ” and similar wording, where the list of two or more elements are joined by “and” or “or”, mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.

[0026] As used herein, unless stated explicitly, performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “has”, “having”, “includes” and / or “including”, when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0028] As used in this application, the term “circuitry” may refer to one or more or all of the following:(a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and(b) combinations of hardware circuits and software, such as (as applicable):(i) a combination of analog and / or digital hardware circuit(s) with software / firmware and(ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and(c) hardware circuit(s) and or processor(s), such as a microprocessor s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.

[0029] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.

[0030] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as New Radio (NR), Long Term Evolution (LTE), LTE- Advanced (LTE- A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G), the second generation (2G), 2.5G, 2.75G, the third generation (3G), the fourth generation (4G), 4.5G, the fifth generation (5G), the sixth generation (6G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.

[0031] As used herein, the term “network entity” refers to a node in a communication network via which a user device accesses the network and receives services therefrom. The network entity may refer to a network device, a base station (BS) or an access point (AP), for example, a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), an NR NB (also referred to as a gNB), a radio access network (RAN) node, a new generation RAN (NG-RAN) node, a Remote Radio Unit (RRU), a radio header (RH), a remote radio head (RRH), a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, an aircraft network device, and so forth, depending on the applied terminology and technology. In some example embodiments, radio access network (RAN) split architecture includes aCentralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node. An IAB node includes a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.

[0032] The term “user device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE), a Subscriber Station (SS), a Portable Subscriber Station, a Mobile Station (MS), a terminal device or an Access Terminal (AT). The user device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA), portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE), laptop-mounted equipment (LME), USB dongles, smart devices, wireless customer-premises equipment (CPE), an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD), a vehicle, a drone, a medical device and applications (e.g., remote surgery), an industrial device and applications (e.g., a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts), a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. The user device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node). In the following description, the terms “user device”, “communication device”, “terminal”, “terminal device”, “user equipment” and “UE” may be used interchangeably.

[0033] As used herein, the term “resource,” “transmission resource,” “resource block,” “physical resource block” (PRB), “uplink resource,” “downlink resource” or “sidelink resource” may refer to any resource for performing a communication, for example, a communication between a user device and a network entity, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.

[0034] FIG. 1A depicts an example of a simplified wireless communication networkshowing some physical and logical network entities. The connections shown in FIG. lAmay be physical connections or logical connections. It is apparent to a person skilled in the art that the wireless communication network may also comprise other physical and logical entities than those shown in FIG. 1 A.

[0035] The example embodiments described herein are not, however, restricted to the wireless communication network given as an example but a person skilled in the art may apply the embodiments described herein to other wireless communication networks provided with necessary properties.

[0036] The example wireless communication network shown in FIG. 1 A includes an access network, such as a radio access network (RAN), and a core network 110.

[0037] FIG. 1A shows user equipment (UE) 100, 102 configured to be in a wireless connection on one or more communication channels in a radio cell with an access node (AN) 104 of an access network. The AN 104 may be an evolved NodeB (abbreviated as eNB or eNodeB), or a next generation evolved NodeB (abbreviated as ng-eNB), or a next generation NodeB (abbreviated as gNB or gNodeB), providing the radio cell. The wireless connection (e.g., radio link) from a UE to the access node 104 may be called uplink (UL) or reverse link, and the wireless connection (e.g., radio link) from the access node to the UE may be called downlink (DL) or forward link. UE 100 may also communicate directly with UE 102, and vice versa, via a wireless connection generally referred to as a sidelink (SL). It should be appreciated that the access node 104 or its functionalities may be implemented by using any node, host, server or access point etc. entity suitable for providing such functionalities.

[0038] The access network may comprise more than one access node, in which case the access nodes may also be configured to communicate with one another over links, wired or wireless. These links between access nodes may be used for sending and receiving control plane signaling and also for routing data from one access node to another access node.

[0039] The access node may comprise a computing device configured to control the radio resources of the access node. The access node may also be referred to as a network entity, a base station, a base transceiver station (BTS), an access point, a cell site, a radio access node or any other type of node capable of being in a wireless connection with a UE (e.g., UEs 100, 102). The access node may include or be coupled to transceivers. From the transceivers of the access node, a connection may be provided to an antenna unit that establishes bidirectional radio links to UEs 100, 102. The antenna unit may comprise an antenna orantenna element, or a plurality of antennas or antenna elements.

[0040] The access node 104 may further be connected to a core network (CN) 110. The core network 110 may comprise an evolved packet core (EPC) network and / or a 5th generation core network (5GC). The EPC may comprise network entities, such as a serving gateway (S-GW for routing and forwarding data packets), a packet data network gateway (P- GW) for providing connectivity of UEs to external packet data networks, and a mobility management entity (MME). The 5GC may comprise network functions, such as a user plane function (UPF), an access and mobility management function (AMF), and a location management function (LMF).

[0041] The core network 110 may also be able to communicate with one or more external networks 113, such as a public switched telephone network or the Internet, or utilize services provided by them. For example, in 5G wireless communication networks, the UPF of the core network 110 may be configured to communicate with an external data network via an N6 interface. In LTE wireless communication networks, the P-GW of the core network 110 may be configured to communicate with an external data network.

[0042] The illustrated UE 100, 102 is one type of an apparatus to which resources on the air interface may be allocated and assigned. The UE 100, 102 may also be called a wireless communication device, a subscriber unit, a mobile station, a remote terminal, an access terminal, a user terminal, a terminal device, or a user device just to mention but a few names. The UE may be a computing device operating with or without a subscriber identification module (SIM), including, but not limited to, the following types of computing devices: a mobile phone, a smartphone, a personal digital assistant (PDA), a handset, a computing device comprising a wireless modem (e.g., an alarm or measurement device, etc.), a laptop computer, a desktop computer, a tablet, a game console, a notebook, a multimedia device, a reduced capability (RedCap) device, a wearable device (e.g., a watch, earphones or eyeglasses) with radio parts, a sensor comprising a wireless modem, or any computing device comprising a wireless modem integrated in a vehicle.

[0043] It should be appreciated that a UE may also be a nearly exclusive uplink-only device, of which an example may be a camera or video camera loading images or video clips to a network. A UE may also be a device having capability to operate in an Internet of Things (loT) network, which is a scenario in which objects may be provided with the ability to transfer data over a network without requiring human-to-human or human-to-computerinteraction. The UE may also utilize cloud. In some applications, the computation may be carried out in the cloud or in another UE.

[0044] The wireless communication network may also be able to support the usage of cloud services, for example at least part of core network operations may be carried out as a cloud service (this is depicted in FIG. lAby “cloud” 114). The wireless communication network may also comprise a central control entity, or the like, providing facilities for wireless communication networks of different operators to cooperate for example in spectrum sharing.

[0045] 5G enables using multiple input - multiple output (MIMO) antennas in the access node 104 and / or the UE 100, 102, many more base stations or access nodes than an LTE network (a so-called small cell concept), including macro sites operating in co-operation with smaller stations and employing a variety of radio technologies depending on service needs, use cases and / or spectrum available. 5G wireless communication networks may support a wide range of use cases and related applications including video streaming, augmented reality, different ways of data sharing and various forms of machine type applications, such as (massive) machine-type communications (mMTC), including vehicular safety, different sensors and real-time control.

[0046] In 5G wireless communication networks, access nodes and / or UEs may have multiple radio interfaces, namely below 6GHz, cmWave and mmWave, and also being integrable with existing legacy radio access technologies, such as the LTE. Integration with the LTE may be implemented, for example, as a system, where macro coverage may be provided by the LTE, and 5G radio interface access may come from small cells by aggregation to the LTE. In other words, a 5G wireless communication network may support both inter-RAT operability (such as LTE-5G) and inter-RI operability (inter-radio interface operability, such as below 6GHz - cmWave - mmWave). One of the concepts considered to be used in 5G wireless communication networks may be network slicing, in which multiple independent and dedicated virtual sub-networks (network instances) may be created within the substantially same infrastructure to run services that have different requirements on latency, reliability, throughput and mobility.

[0047] In some example embodiments, an access node (e.g., access node 104) may comprise: a radio unit (RU) comprising a radio transceiver (TRX), i.e., a transmitter (Tx) and a receiver (Rx); one or more distributed units (DUs) 105 that may be used for the so-called Layer 1 (LI) processing and real-time Layer 2 (L2) processing; and a central unit (CU) 108(also known as a centralized unit) that may be used for non-real-time L2 and Layer 3 (L3) processing. The CU 108 may be connected to the one or more DUs 105 for example via an Fl interface. Such an embodiment of the access node may enable the centralization of CUs relative to the cell sites and DUs, whereas DUs may be more distributed and may even remain at cell sites. The CU and DU together may also be referred to as baseband or a baseband unit (BBU). The CU and DU may also be comprised in a radio access point (RAP).

[0048] The CU 108 may be a logical node hosting radio resource control (RRC), service data adaptation protocol (SDAP) and / or packet data convergence protocol (PDCP), of the NR protocol stack for an access node. The DU 105 may be a logical node hosting radio link control (RLC), medium access control (MAC) and / or physical (PHY) layers of the NR protocol stack for the access node. The operations of the DU may be at least partly controlled by the CU. It should also be understood that the distribution of functions between DU 105 and CU 108 may vary depending on implementation. The CU may comprise a control plane (CU-CP), which may be a logical node hosting the RRC and the control plane part of the PDCP protocol of the NR protocol stack for the access node. The CU may further comprise a user plane (CU-UP), which may be a logical node hosting the user plane part of the PDCP protocol and the SDAP protocol of the CU for the access node.

[0049] Cloud computing systems may also be used to provide the CU 108 and / or DU 105. A CU provided by a cloud computing system may be referred to as a virtualized CU (vCU). In addition to the vCU, there may also be a virtualized DU (vDU) provided by a cloud computing system. Furthermore, there may also be a combination, where the DU may be implemented on so-called bare metal solutions, for example application-specific integrated circuit (ASIC) or customer-specific standard product (CSSP) system-on-a-chip (SoC).

[0050] Edge cloud may be brought into the access network (e.g., RAN) by utilizing network function virtualization (NFV) and software defined networking (SDN). Using edge cloud may mean access node operations to be carried out, at least partly, in a computing system operationally coupled to a remote radio head (RRH) or a radio unit (RU) of an access node. It is also possible that access node operations may be performed on a distributed computing system or a cloud computing system located at the access node. Application of cloud RAN architecture enables RAN real-time functions being carried out at the access network (e.g., in a DU 105) and non-real-time functions being carried out in a centralized manner (e.g., in a CU 108).

[0051] It should also be understood that the distribution of functions between core network operations and access node operations may differ in future wireless communication networks compared to that of the LTE or 5G, 6G, or even be non-existent. Some other technology advancements that may be used include big data and all-IP, which may change the way wireless communication networks are being constructed and managed. 5G (or new radio, NR) wireless communication networks may support multiple hierarchies, where multi-access edge computing (MEC) servers may be placed between the core network 110 and the access node 104. It should be appreciated that MEC may be applied in LTE wireless communication networks as well.

[0052] A 5G wireless communication network (“5G network”) may also comprise a nonterrestrial communication network, such as a satellite communication network, to enhance or complement the coverage of the 5G radio access network. For example, satellite communication may support the transfer of data between the 5G radio access network and the core network, enabling more extensive network coverage. Possible use cases may be providing service continuity for machine-to-machine (M2M) or Internet of Things (loT) devices or for passengers on board of vehicles, or ensuring service availability for critical communications, and future railway / maritime / aeronautical communications. Satellite communication may utilize geostationary earth orbit (GEO) satellite systems, but also low earth orbit (LEO) satellite systems, in particular mega-constellations (systems in which hundreds of (nano)satellites are deployed). A given satellite 106 in the mega-constellation may cover several satellite-enabled network entities that create on-ground cells. The on- ground cells may be created through an on-ground relay access node or by an access node 104 located on-ground or in a satellite.

[0053] It is obvious for a person skilled in the art that the access node 104 depicted in FIG. 1 A is just an example of a part of an access network (e.g., a radio access network) and in practice, the access network may comprise a plurality of access nodes, the UEs 100, 102 may have access to a plurality of radio cells, and the access network may also comprise other apparatuses, such as physical layer relay access nodes or other entities. At least one of the access nodes may be a Home eNodeB or a Home gNodeB. A Home gNodeB or a Home eNodeB is a type of access node that may be used to provide indoor coverage inside a home, office, or other indoor environment.

[0054] Additionally, in a geographical area of an access network (e.g., a radio access network), a plurality of different kinds of radio cells as well as a plurality of radio cells maybe provided. Radio cells may be macro cells (or umbrella cells) which may be large cells having a diameter of up to tens of kilometers, or smaller cells such as micro-, femto- or picocells. The access node(s) of FIG. lAmay provide any kind of these cells. A cellular radio network may be implemented as a multilayer access networks including several kinds of radio cells. In multilayer access networks, one access node may provide one kind of a radio cell or radio cells, and thus a plurality of access nodes may be needed to provide such a multilayer access network.

[0055] For fulfilling the need for improving performance of access networks, the concept of “plug-and-play” access nodes may be introduced. An access network which may be able to use “plug-and-play” access nodes, may include, in addition to Home eNodeBs or Home gNodeBs, a Home Node B gateway, or HNB-GW (not shown in FIG. 1A). An HNB-GW, which may be installed within an operator’s access network, may aggregate traffic from a large number of Home eNodeBs or Home gNodeBs back to a core network of the operator.

[0056] FIG. IB illustrates an example of a system, to which some example embodiments may be applied. FIG. IB may be understood to depict a part of the wireless communication network of FIG. 1A, but with greater accuracy with respect to cell re-selection. The system comprises at least a UE 100 and a plurality of RAN nodes 104, 104B, 104C, 104D (e.g., gNBs) controlling a plurality of cells 121, 122, 123, 124. Herein the term “cell” refers to a radio cell. Although four cells 121, 122, 123, 124 and four RAN nodes 104, 104B, 104C, 104D are shown in FIG. IB, it should be noted that the number of cells and RAN nodes may also be higher or lower than four. In addition, each of the cells is controlled by each of the RAN nodes in FIG. IB, but one or more cells may be controlled by a single RAN node.

[0057] With cell selection, the UE 100 searches for a suitable cell of the selected public land mobile network (PLMN) or selected stand-alone non-public network (SNPN), chooses that cell to provide available services, and monitors its control channel. This procedure is defined as "camping on the cell". If the UE 100 finds a more suitable cell, according to the cell re-selection criteria, the UE 100 re-selects onto that cell and camps on it. For example, cell re-selection may be based on measurements and evaluations of signal strength, quality, and / or other parameters of the current serving cell 121 and one or more neighboring cells 122, 123, 124. The UE 100 may autonomously make the decision to re-select a different cell in idle (RRC IDLE) mode, or if the UE experiences a radio link failure.

[0058] LTM procedure

[0059] Hereinafter, the LTM procedure that may be applied to the embodiments of the disclosure, is explained.

[0060] LTM is a cell switch procedure, where UE’s serving cell (PCell or PSCell) is switched by the network by sending an LTM cell switch command. An LTM switch command is currently assumed delivered by MAC signaling using a Medium Access Control Control Element (MAC CE). Hence, not using RRC signaling as a L3 based handover which is one of the current methods for changing between cells. LTM cell switch decision is currently assumed to be based on LI measurements that are performed and reported using LI measurement reports by the UE. Measurements and reporting are based on LTM candidate cell configuration provided by the network for one or more LTM candidate cells. An LTM candidate cell may be neighboring cells or a UE’s current serving cells (e.g. SCells).

[0061] In Release- 18, LTM measurements on a neighboring candidate cell are performed using Synchronization Signal Blocks (SSBs, or Synchronized signals and PBCH blocks) transmitted by the candidate cell for which the SSB configuration is provided to the UE.

[0062] Before the cell switch, network may optionally activate one or more Transmission Configuration Indicator (TCI) state(s) for one or more candidate cells. Once a candidate cell TCI state is activated the UE may start tracking the time / frequency synchronization using the reference signals associated with the activated TCI state(s). The UE may also perform early UL synchronization before the cell switch if this is requested by the network.

[0063] FIG. 2 illustrates the LTM procedure based on TS 38.300 standard document.

[0064] The LTM procedure may comprise 4 stages such as the LTM preparation stage, the early synchronization stage, the LTM execution stage, and the LTM competition stage.

[0065] During the LTM preparation stage, the UE that is in a RRC connected state (S201) may send a Measurement Report message to the gNB. The gNB may decide to configure LTM candidates and initiates LTM preparation (S205).

[0066] The gNB may transmit an RRC Reconfiguration message to the UE including the LTM candidate configurations (S207).

[0067] The UE may store the LTM candidate configurations and transmits an RRC Reconfiguration Complete message to the gNB (S209).

[0068] During the synchronization stage, the UE may perform DL synchronization with thecandidate cell(s) before receiving the cell switch command (S211).

[0069] Then, the UE may perform early timing advance (TA) acquisition with the candidate cell(s) as requested by the network before receiving the cell switch command as specified in clause 9.2.6 of TS38.300 document. This is done via contention free random access (CFRA) triggered by a physical downlink control channel (PDCCH) order from the source cell, following which the UE sends preamble towards the indicated candidate cell. In order to minimize the data interruption of the source cell due to CFRA towards the candidate cell(s), the UE doesn’t receive random access response from the network for the purpose of TA value acquisition and the TA value of the candidate cell is indicated in the cell switch command. The UE doesn’t maintain the TA timer for the candidate cell and relies on network implementation to guarantee the TA validity.

[0070] During the LTM execution stage, the UE may perform LI measurements on the configured candidate cell(s), and transmits LI measurement reports to the gNB (S215). In this case, the LI measurement should be performed as long as RRC reconfiguration (S207) is applicable.

[0071] The gNB may decide to execute cell switch (i.e., LTM decision) to a target cell and transmits a MAC CE triggering cell switch by including a candidate configuration index of the target cell (S219).

[0072] The UE may detach from the source cell and switch to the target cell by applying a target configuration indicated by the candidate configuration index (S221).

[0073] The UE may perform the random access procedure towards the target cell, if UE does not have valid TA of the target cell as specified in clause 6.1.3.75 of TS 38.321 (S223).

[0074] The UE may complete the LTM cell switch procedure by sending RRC Reconfiguration Complete message to target cell (S225). If the UE has performed a random access (RA) procedure in step S223, the UE considers that LTM cell switch execution is successfully completed when the random access procedure is successfully completed. For RACH-less LTM, the UE considers that LTM cell switch execution is successfully completed when the UE determines that the network has successfully received its first UL data.

[0075] The steps S211 to 225 may be performed multiple times for subsequent LTM using the LTM candidate configuration(s) provided in step S207.

[0076] The procedure over the air interface described above may be applicable to both intra-gNB-DU LTM and inter-gNB-DU LTM. The overall LTM procedures over Fl-C interface are captured in TS 38.401.

[0077] The LTM procedure may be applied to the other embodiments of the present disclosure.

[0078] LI measurement configuration in Rel-18 LTM

[0079] FIG. 3 illustrates the LI measurement configuration that may be applied to the embodiments of the disclosure.

[0080] In Rel-18 LTM (i.e., LTM supported by release 18 system of the 3GPP), information about measurement resources (e.g., SSBs) from LTM candidate cells may be provided to the UE so that UE can perform measurements. The UE may be also configured with LI measurement reporting configuration containing the UL resources information where the UE can report the measurements to the network device. For LTM, periodic and semi-persistent report on PUCCH, semi-persistent report on PUSCH, and aperiodic report on PUSCH may be supported.

[0081] Referring to Fig. 3, the UE may be configured with one or more LTM CSI reporting configurations (e.g., #n LTM-CSI-ReportConfig Information Element (IE), 310) where each reporting configuration contains at least one LTM CSI resource configuration (e.g., #m LTM- CSLResourceConfig IE, 320) containing the information of resources to be used for channel measurements (e.g., layer 1 reference signal received power (LI -RSRP) measurements). For each reporting configuration, the UE may be configured to report M beams from each of the L configured candidate cells (M and L are integer value bigger than 1). Each LTM CSI Resource Setting (e.g., LTM-CSI-ResourceConfig IE) may contain configuration of an LTM- CSLSSB-ResourceSet (330) which comprises of a list of Z > 1 SS / PBCH blocks indices (given by Itm-CSI-SSB-ResourceList, e.g., SSB kl, SSB k2, SSB k3, ... SSB kZ)) and a list of Z LTM-Candidatelds (given by Itm-CandidatelDList, e.g., Candidate ID #rl, Candidate ID #r2, . . . , Candidate ID #rZ) referring to candidate cells associated with the SS / PBCH block indices.

[0082] For each candidate cell, the UE may determine the time domain behavior of a SS / PBCH block (e.g., SSB) resource from ssb-Periodicity and ssb-PositionsInBurst and the frequency domain behavior of a SS / PBCH block resource is determined by the higher layer parameters subCarrierSpacing, ssbFrequency.

[0083] For each cell, LTM CSI Report Configurations are given under current serving cell’s configuration where each report configuration contains an indication of a LTM CSI Resource Config and other parameters related for reporting, e.g., timing and uplink resources to transmit reports.

[0084] An LTM CSI Resource configuration may contain a set of SSB indices from multiple candidate cells. This is placed in a common LTM configuration, i.e., in LTM-Config IE.

[0085] The detailed configuration of each SSB of a candidate cell indicated in a LTM CSI Resource configuration given in LTM-SSB-Config under LTM-Candidate IE. For each candidate cell, LTM-Candidate information element (IE) contains the configuration / information which is needed by the UE before the cell switch, e.g., SSB information for LTM measurements.

[0086] The LTM-Candidate IE also contains the list of Non Zero Power Channel State Information Reference Signal (NZP-CSLRS) resources which are currently used to provide the information for activation of TCI states associated with tracking Reference Signal (RS) (e.g., a type of CSLRS). The same may be used for LTM measurements with CSLRSs.

[0087] An LTM-Candidate IE also includes RRC container containing the candidate configuration (e.g., ServingCellConfig) which contains the configuration details that may be needed by the UE after UE moves to this candidate cell after the cell switch from the current serving cell. In other words, ServingCellConfig IE given under LTM-Candidate IE contains the configuration details needed to perform regular serving cell operation within the candidate cell.

[0088] FIG. 4 illustrates the main components of Rel-18 LTM configuration and how they are placed.

[0089] The LTM-Config IE includes the LTM reference configuration (e.g., LTM reference Config IE), the LTM CSI resource Configurations, and the LTM Candidate Configuration (LTM-Candidate) containing the configuration of each candidate cell. Note that some other parameters which are not relevant to subject herein are not shown in the Fig. 4 . The complete configuration details are specified in TS 38.331 document

[0090] The LTM CSI resource configurations may comprise at least one LTM CSI resource Configuration. The LTM CSI resource configuration of FIG. 4 may include three LTM CSI resource configurations.

[0091] For example, the LTM CSI resource config 1 indicates resource sets [SSB1, Cell 1], [SSB2, Celli], [SSB1, Cell 2] and [SSB 3, Cell3], This means that the SSB1 is used for cell 1 and SSB2 is used for cell 2 and SSB3 is used for cell3. The LTM CSI resource config 2 and The LTM CSI resource config 3 also include the resource sets depicted in Fig. 4.

[0092] LTM-Candidate IE comprises the LTM candidate Cell information for at least one cells (e.g., LTM Candidate Cell 1, LTM Candidate Cell 2, and LTM Candidate Cell 3). Each of the LTM candidate cell information may comprises candidate cell ID (e.g., Physical cell ID, PCI), TCI state list and configuration, SSB configuration, early TA configuration, serving cell configuration IE.

[0093] The serving cell configuration IE comprises the LTM report configuration IE. The LTM report configuration may comprise at least one LTM report Configuration and at least one LTM resource configuration.

[0094] For example, the LTM Candidate cell 3 indicates the PCI of cell 3 and TCI state lists and configurations. In addition, the LTM Candidate Cell 3 comprises SSB configuration information, early TA configuration information, and serving cell configuration information of Cell 3. The LTM report configuration indicates that a serving cell is cell 3 and candidate cells are cell 1 and cell 2. The LTM candidate cell 1 and 2 also indicate and comprise the information in the same manner as the LTM candidate cell 3.

[0095] Table 1 is one of examples of LTM-C Si-Report Configuration Information Element.[Table 1]

[0096] The LTM-C Si-Report Configuration (LTM-CSI-ReportConfig) IE is used to configure report on the cell in which the LTM-C SI-ReportConig is included. The LTM-CSI- ReportConfig field may comprise a Itm-CSI-ReportConfigld filed identifying an LTM-CSI- ReportConfig IE, a Itm -ReportContent field defining the content of the LTML1 measurement report, a Itm-ResourcesForChannelMeasurement field indicating the resources used for LTMLI measurements, a pucch-CSLResourceList indicating which PUCCH resource to use for reporting on PUCCH, a reportConfigType field describing the time domain behaviour of how the LI measurements for LTM are reported, a reportSlotConfig IE indicating a periodicityand slot offset (see TS 38.214, clause 5.2.1.4). The LTM-C Si-Report Configuration IE may comprises a reportSlotOffsetList, a reportSlotOffsetListDCI-O-1, and a reportSlotOffsetListDCI-O-2 fields indicating timing offset Y for semi persistent reporting using PUSCH and aperiodic reporting.

[0097] The LTM report content IE may comprise a nrOfReportedCells field defining how many cells are reported within a single LI measurement report instance, a nrOfReportedRS- PerCell field defining how many RSs per cell are reported within a single LI measurement report instance, and a spCelllnclusion field indicating whether the UE shall include a LI measurement report associated to the current SpCell. The spCelllnclusion field can only be configured if the current SpCell is configured as an LTM candidate cell.

[0098] Table 2 is one of examples of LTM-C Si-Resource Configuration Information Element. The IE LTM-C SI-ResourceConfig may define a group of one or more CSI resources for one or more LTM candidate configurations.[Table 2]_

[0099] The LTM-C SI-ResourceConfig IE of table 2 may comprise a Itm-CSL ResourceConfigld field being used to identify an instance of LTM-CSI-ResourceConfig IE, a Itm-CSLSSB-ResourceSet field defining one SS / PBCH block resource set from one or more LTM candidate cells.

[0100] The LTM-CSI-SSB-ResourceSet field may describe a Itm-CandidateldList field Indicating the LTM candidate cell IDs related to the SSBs in the Itm-CSI-SSB-ResourceList(the list has the same number of entries as Itm-CSI-SSB-ResourceList), a Itm-CSI-SSB- ResourceList field being used to indicate on SS / PBCH block resources from one or more LTM candidate cells, and a Itm-CSI-SSB-ResourceSetld field being used to idenfity on SS / PBCH block resource set.

[0101] The LTM-CSI-ResourceConfigid field may be used to identify an LTM-CSI- Resource Configuration.

[0102] Rel-19 NR mobility enhancement

[0103] The LTM was introduced in Rel-18 and can offer improvements in handover latency and interruption time compared to Layer 3 based mobility. However, LTM as introduced in Rel-18 also has a number of limitations compared to Layer 3 mobility. One of the objectives is to enable CSLRS measurements for LTM procedures. For example, specifying support for CSLRS measurements for LTM procedure and enabling CSLRS based beam management, and / or other necessary physical layer operations on candidate cells before LTM.

[0104] CSLRS configuration and QCL information

[0105] Hereinafter, the CSLRS configuration and QCL information that may be applied to the embodiments of the disclosure, is explained.

[0106] In order to trigger the cell change in S219 of FIG. 2, the serving DU (e.g., gNB) needs to indicate the TCI state which includes the QCL information for receiving on Physical Downlink Control Channel (PDCCH) / Physical Downlink Shared Channel (PDSCH) from the target cell (e.g., DL reception) and / or for transmitting on Physical Uplink Control Channel (PUCCH) / Physical Uplink Shared Channel (PUSCH, e.g., UL transmission).

[0107] The quasi collocation (QCL) information contains 1) the Reference Signal (RS) information, 2) QCL type information (e.g., QCL type = type A, type B, type C or type D), and 3) information related to the bandwidth part (BWP) which the RS is located.

[0108] Table 3 is one of examples of TCLState Information Element. The IE TCLState associates one or two DL reference signals with a corresponding QCL type.[Table 3]

[0109] The QCL type field indicates one of type A, type B, type C or type D. ‘typeA’ indicates that the properties of {Doppler shift, Doppler spread, average delay, delay spread} are quasi collocated. The 'typeB' indicates that {Doppler shift, Doppler spread} are quasi collocated, 'typeC indicates that {Doppler shift, average delay} are quasi collocated, and'typeD' indicates that {Spatial Rx parameter} is quasi collocated, respectively.

[0110] For switching the serving beam, one of the following options may be allowed for QCL-info:

[0111] Option 1) qcl-Typel : referencesignal = Tracking RS (TRS) index where TRS is a special configuration of CSI-RS index and qcl-Type = A, qcl-Type2 (applicable only in FR2): referencesignal = same TRS index and qcl-Type = D,

[0112] Option 2) qcl-Typel : referencesignal = Tracking RS (TRS) index and qcl-Type = A, qcl-Type2 (applicable only in FR2): referencesignal = CSI-RS index with repetition and qcl- Type = D.

[0113] For instance, in option 1) and for FR1 the serving cell indicates to the TRS index as the QCL source which shall be used by the UE to estimate the channel properties (doppler shift, doppler spread, average delay, delay spread) for receiving PDCCH / PDSCH or / and transmitting PUCCH / PUSCH.

[0114] The IE NZP-CSI-RS-Resource is used to configure Non-Zero-Power (NZP) CSI-RS transmitted in the cell where the NZP-CSI-RS-Resource IE is included, which the UE may be configured to measure on (see TS 38.214, clause 5.2.2.3.1). A change of configuration between periodic, semi-persistent or aperiodic for an NZP-CSI-RS-Resource is not supported without a release and add.

[0115] FIG. 5 illustrates an example of the CSI-RSs quasi collocated with SSBs.

[0116] For a CSI-RS resource, there might be an SSB-index which serves as source RS for QCL information (given by the qcl-InfoPeriodicCSI-RS IE which points to a TCI state which further points to its QCL source RS). This can be done either direct or indirect QCL chain reference. In case of direct QCL reference, a SSB can be configured as the QCL source of the CSI-RS. In case of indirect QCL reference, for example, a CSI-RS can have another CSI- RS as the QCL reference where the reference CSI-RS has a SSB as its QCL reference.

[0117] Refer to Fig. 5, given that an SSB is typically transmitted using a wider beam compared with a CSI-RS, multiple CSI-RS indices might be associated with the same source SSB-index. For instance, in the example below of Error! Reference source not found., SSB 1 serves as source RS for QCL information of CSI-RS 1, CSI-RS 2, CSI-RS 3 and CSI- RS 4, and SSB 2 for CSI-RS 5 to 8.

[0118] Candidate cell measurements and reporting for cell switching

[0119] Hereinafter, methods and apparatus for candidate cell measurements and reporting for cell switching, as one of the embodiments of the disclosure are explained.

[0120] In Rel-18 LTM, only SSB based layer 1 measurements are used to evaluate the quality of candidate cells for cell switch decisions. Also, the UE may perform early downlink (DL) synchronization based on SSBs to reduce the handover interruption. However, the CSI- RS measurements can be performed over larger bandwidth with shorter periodicity and narrower beams compared to SSB based measurements. Therefore, CSI-RS based measurements can facilitate switching the UE with narrower beam and links with better time / frequency synchronization in the target cell.

[0121] In Rel-19 mobility enhancements may support for layer 1 CSI-RS measurements for LTM procedures. In order to enable layer 1 candidate cell measurements using CSI-RSs, a set of CSI-RSs belonging to the candidate cell along with their configuration (e.g., resourceallocation, RS sequence, etc.) needs to be provided to facilitate CSI-RS based candidate cell layer 1 measurements (e.g., Ll-RSRP).

[0122] Typically, a candidate cell would provide the same CSI-RSs for LTM measurements which are being used by the UEs served by the candidate cell. Since in each candidate cell, CSI-RSs are configured as UE-specific (typically with narrower beams, shorter periodicity, and multiple frequency locations), there can be many CSI-RS configured compared to cellspecific and always on SSBs. It is challenging for candidate cell to predict direction LTM UE would be moving to, hence candidate DU may need to provide / configure CSI-RSs without any additional UE-specific information of the LTM UE.

[0123] This may force the UE to perform measurements on many configured CSI-RS indices of prepared target cell even when they are not relevant (e.g., not transmitted towards the UE). This can be limiting factor given that multiple cells can be prepared in LTM. As well as the UE may be required to report the measurements which may incur significant overhead to uplink resources at the current serving cell.

[0124] Thus, the embodiments of the disclosure provides (1) howto reduce the unnecessary CSI-RS measurements performed by the U and (2) how to reduce the uplink resource overhead for LTM measurements reporting.

[0125] In this embodiment, a provision of CSI-RS measurements for a candidate cell is proposed.

[0126] Option 1 - Multiplexing of different resource sets (e.g., SSB and CSI-RS Resource sets) in a LTM Measurement Report IE.

[0127] In order to minimize the uplink resource utilization due to additional CSI-RS measurements and also to minimize the overall UE measurements, a mechanism where a report configuration can be associated with resource sets with different RS type (SSB and CSI-RS) is proposed. In this case, one resource set can contain different sets of RSs from candidate cells. Initially the UE may be configured to make measurement on a resource set (Initial Set, e.g., containing SSBs from candidate cells), and then later based on the available measurements on a resource set, measurements of another resource set can be triggered. Similarly, conditions to stop measurements on a resource set are considered. Also, selection of measurements (available from the selected resource set) to report on the UL resources of the report configuration is considered.

[0128] Option 2 - Multiple report configurations sharing the same uplink resources forreporting

[0129] A solution where multiple report configurations (e.g., each associated a single resource set) associated with the same UL resources, but with different resource sets (e.g., one with resource set of SSBs, another one with resource sets of CSI-RSs) is considered. Mechanism to select report configuration(s) to perform measurements, and then mechanism to select measurements associated with a report configuration to report when measurements for more than two report configurations are available are considered.

[0130] For both the above option 1 and 2, following are the methods for multiplexing different resource sets in a report configuration (option 1) or report configurations (option 2).

[0131] Switching of resource sets for reporting (option 1) or selection of a specific report (option 2) is configured based on specific measurement conditions. The measurement conditions can be thresholds for switching the resource sets or report configurations. Alternatively, LI measurements based event conditions can be configured with entry and leaving conditions that can be mapped to specific type of resource set or report configuration.

[0132] Identification of resource set or report configuration in the uplink control information (UCI) can be done with additional information included in the UCI. It can be a flag to switch between two types in case of only two different types (i.e., two resource sets in option 1 or two report configuration in option 2). If more than one resource sets or report configurations are multiplexed, the flag can be bitmap also.

[0133] In another embodiment, the switching can be indicated via Medium Access Control Control Element (MAC CE) or UL control information before the UE actually switching the report contents in UCI. This can be considered as reporting the status of the event. The MAC CE or UL control information may contain the information of selected resource set or report configuration. The UE may perform the measurements for the selected resource set or report configuration and reports the measurements.

[0134] Multiple resource sets with one report configuration

[0135] Hereinafter, multiple resource sets with one report configuration as one of the embodiments of the disclosure (option 1), is explained.

[0136] For example, a LTM report configuration IE (e.g., LTM-CSI-ReportConfig) may be associated with more than one resource sets. Each resource set contains the information ofRSs (SSB or CSI-RS) of one or more candidate cells. The information may be RS index and its candidate cell index. The report configuration may further indicate the initial / default resource set(s) (e.g., resource set index(ices)) to be considered for initial CSI measurements (e.g., Ll-RSRP, Ll-SINR, RSRQ, etc.) and reporting. After the activation of the report configuration, the UE may report the measurements associated with the initial / default resource set.

[0137] In one example, a CSI report configuration may be associated with a resource configuration (e.g., LTM-CSI-ResourceConfig) which contain multiple resource sets. Alternatively, a LTM report configuration may be associated with more than one resource configuration IES (e.g., LTM-CSI-ResourceConfigs). In this case, each resource configuration contains one resource set.

[0138] In one example, a resource set may contain one or more SSB indices and / or one or more CSI-RS indices from one or more candidate cells.

[0139] FIG. 6 illustrates the examples related to multiple resource sets for a CSI report configuration.

[0140] Referring to Fig. 6, it is assumed that three candidate cells are configured to the user device, but the number of candidate cells is not restricted as three and varied according to the channel status and / or the configuration of the network device.

[0141] The CSI report configuration X may comprise the resource set 1 (e.g., an initial resource set) indicating resources (e.g., reference signal) from candidate cells. For example, the resource set 1 contains information of the resource pairs of {(SSB1, Cand cell 1), (SSB4, Cand cell 2), and (SSB1, Cand Cell3)}. The resource pair of (SSB1, Cand Cell 1) means that SSB1 is the beam of candidate cell 1.

[0142] The resource set 2 contains information of the resource pairs of {(CSI-RS 1, Cand Cell3), (CSI-RS2, Cand Celli), (CSI-RS3, Cand Celli), and (CSI-RS4, Cand Celli)}. The resource pair of (CSI-RS2, Cand Celli) means that CSI-RS2 is a narrow beam of candidate cell 1.

[0143] The other resource sets 3 to 5 of Fig. 6 can be interpreted as the same manner.

[0144] The multiple resource sets (e.g., resource set 1 to 5) may be configured by using the LTM-CSI report configuration (310), LTM-CSI-Resource configuration (320) and the LTM- C SI- SSB resource set (330) of FIG. 3.

[0145] FIG. 7 illustrates an embodiment of configuring multiple resource sets for a CSI report configuration.

[0146] Referring to Fig. 7, the user device (100) is configured to perform a method comprising a step of obtaining (S710) a Channel State Information (CSI) report configuration. The CSI report configuration may comprise a first list indicating at least one first resource set associated with first reference signals (e.g., SSB) of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals (e.g., CSI-RS) of the at least one candidate cell, and information indicative of uplink resources for a CSI report.

[0147] The method comprises steps of performing (S720) at least one first CSI measurement on the at least one first resource set; selecting (S730) one or more resource sets from the at least one second resource set based on the at least one first CSI measurement and at least one criterion; performing (S740) at least one second CSI measurement on the selected one or more second resource sets; and transmitting (S750) the CSI report including the at least one second CSI measurement to a network device using the uplink resources.

[0148] At S710, the CSI report configuration may be pre-configured on the memory of the user device or hard corded in the standard document.

[0149] Alternatively, the network device (104) may transmit (S705) the CSI report configuration to a user device.

[0150] In FIG. 7, the CSI report configuration of S710 may be a low layer triggered mobility (LTM) report configuration, and the CSI report may be a layer one (LI) LTM measurement report.

[0151] The CSI report configuration of S710 may comprises an indication indicative of an initial resource set of the at least one first resource set to perform the at least one first measurement.

[0152] The at least one first resource set or the at least one second resource set may include at least one Synchronization Signal Block (SSB) index indicating at least one SSB from the at least one candidate cell and at least one candidate cell index related to the at least one candidate cell.

[0153] The at least one first resource set or the at least one second resource set may include at least one channel state information-reference signal (CSI-RS) index indicating at least oneCSI-RS from the at least one candidate cell and at least one candidate cell index related to the at least one candidate cell.

[0154] The CSI report configuration of S710 may further comprise information indicating the at least one criterion. Alternatively, the at least one criterion may be predetermined and stored by the memory of the user device and / or the network device. The at least one criterion may include at least one threshold value related to a Ll-RSRP, a layer 1 signal to interference plus Noise Ratio (Ll-SINR), or Reference Signal Received Quality (RSRQ).

[0155] The method performed by the user device may further includes a step of performing a measurement on the at least one first resource set when the at least one second measurement on the selected second resource set is performed.

[0156] The method performed by the user device may further includes a step of transmitting a CSI report including a result of the at least one first CSI measurement, via the uplink resource. In addition, the network device 104 is further configurated to receive the CSI report including a result of the at least one first CSI measurement, via the uplink resources. In this case, the CSI report is different from the CSI report of S750.

[0157] The CSI report configuration of S710 may contain one or more resource configurations including one of the at least one first resource set and the at least one second resource set.

[0158] The first reference signals indicated by the at least one first resource set may be Quasi collocated (QCL) with the second reference signals indicated by the at least one second resource set.

[0159] The method performed by the user device may further include a step of stopping performing at least one first CSI measurement when one of the at least one second resource set is selected.

[0160] One of the at least one criterion may be priority information indicating a priority among the at least one second resource set.

[0161] The method performed by the user device may further include a step of stopping performing the at least one second CSI measurement when a condition is met. The condition may be one of: a threshold value related to the at least one second CSI measurement of the selected second resource set, anda threshold value related to the at least one first CSI measurement of the at least one first resource set.

[0162] The CSI report of S750 may include at least one index of at least one resource set on which a measurement is performed.

[0163] The CSI report of S750 may include measurements on only one of two or more resource sets, at a reporting occasion.

[0164] The user device 100 may be configured to update CSI measurements on N resource sets when the N resource sets are selected, where N is an integer value greater than or equal to 1.

[0165] The CSI measurements of one of two or more resource sets are reported based on at least one criterion of a resource set with a lowest or highest resource set index; a resource set having a largest measurement value; a resource set containing a reference signal from the lowest or highest candidate cell index; a resource set containing a reference signal of a candidate cell for which a timing advance, TA, has been acquired; a resource set containing a reference signal of a candidate cell for which an early physical random access channel, PRACH, transmission has been performed; or a resource set containing a reference signal of a candidate cell associated with one or more activated transmission configuration index, TCI, states.

[0166] The CSI measurements of one of two or more resource sets may be selected for reporting based on a priority among the two or more resource sets.

[0167] FIG. 7 also discloses the method performed by the network device 104.

[0168] The method performed by the network device 104 comprises steps of transmitting (S705), to a user device, a channel state information (CSI) report configuration comprising a first list indicating at least one first resource set associated with first reference signal of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and information indicative of uplink resources for a CSI report; and receiving (S750), from the user device, the CSI reportincluding the at least one second CSI measurement using the uplink resources.

[0169] The CSI report configuration of S705 may be a low layer triggered mobility (LTM) report configuration, and the CSI report may be a layer one (LI) LTM measurement report.

[0170] The CSI report configuration of S705 may comprise an indication indicative of an initial resource set of the at least one first resource set to perform the at least one first measurement.

[0171] The at least one first resource set or the at least one second resource set may include at least one synchronization signal block (SSB) index indicating at least one SSB from the at least one candidate cell and at least one candidate cell index related to the at least one candidate cell.

[0172] The at least one first resource set or the at least one second resource set may include at least one channel state information-reference signal (CSLRS) index indicating at least one CSLRS from the at least one candidate cell and at least one candidate cell index related to the at least one candidate cell.

[0173] The CSI report configuration may further comprise information indicating the at least one criterion. Alternatively, the at least one criterion may be predetermined and stored by the memory of the user device and / or the network device. The at least one criterion may include at least one threshold value related to a layer one reference signal received power (Ll-RSRP), a layer one signal to interference plus Noise Ratio (Ll-SINR), or Reference Signal Received Quality (RSRQ).

[0174] The method performed by the network device 104 may further includes a step of receiving a CSI report including a result of the at least one first CSI measurement, via the uplink resources.

[0175] The CSI report configuration of S705 may contain one or more resource configurations including one of the at least one first resource set and the at least one second resource set.

[0176] The first reference signals indicated by the at least one first resource set may be Quasi collocated with the second reference signals indicated by the at least one second resource set.

[0177] The CSI report of S750 may include at least one index of at least one resource set on which a measurement is performed.

[0178] The network device 104 may configure the user device 100 to transmit the CSI report including measurements on only one of two or more resource sets, at a reporting occasion.

[0179] The network device 104 may configure the user device 100 to update CSI measurements on N resource sets when the N resource sets are selected, where N is an integer value greater than 1.

[0180] The CSI measurements of one of two or more resource sets are reported based on at least one criterion of a resource set with a lowest or highest resource set index; a resource set having a largest measurement value; a resource set containing a reference signal from the lowest or highest candidate cell index; a resource set containing a reference signal of a candidate cell for which a timing advance, TA, has been acquired; a resource set containing a reference signal of a candidate cell for which an early physical random access channel, PRACH, transmission has been performed; or a resource set containing a reference signal of a candidate cell associated with one or more activated transmission configuration index, TCI, states.

[0181] The CSI measurements of one of two or more resource sets may be selected for reporting based on a priority among the two or more resource sets.

[0182] Fig. 8 illustrates other embodiment of configuring multiple resource sets for CSI report configuration.

[0183] A user device 100 is connected to the source cell controlled by a network device 104 (S801). The network device 104 controls the source cell and one or more candidate cells. The one or more candidate cells may be controlled by not the network device 104 but by the other network device (not shown).

[0184] The user device 100 may perform L3 measurement and transmit L3 measurement report to the network device 104 via the source cell (S803).

[0185] After receiving the L3 measurement report, the network device 104 may perform ahandover (HO) preparation between the source cell and the one or more candidate cells (S805).

[0186] The network device 104 transmits the LTM report configuration IE including information related to resource set 1 (RSI), resource set 2 (RS2), and resource set 3 (RS3). The LTM report configuration IE may further include information regarding uplink resources for a LTM reporting (S807).

[0187] The RSI is periodically transmitted and includes resource pairs explained in FIG. 5. In addition, the RS2 and RS3 also includes resource pairs explained in FIG. 5.

[0188] The LTM report configuration IE may be a CSI report configuration message. The configuration of the LTM report configuration message may be done based on the methods explained by using FIGs. 3-6. For example, the LTM report configuration (e.g., LTM-CSI- Reportconfig) may be included in a RRC reconfiguration message, and the LTM report configuration may include LTM-CSI-ResourceConfiguration IE defining the RSI to RS3.

[0189] The LTM report configuration may further comprise at least one criterion (or, threshold, condition) that may be used for selecting resource sets to the measured. Or, the at least one criterion may be predetermined and stored by the memory of the user device and / or the network device.

[0190] The user device 100 received the LTM report configuration may start measurement on the RSI (S809). In this case, the RSI may be set as an initial RS or default RS. The LTM report configuration IE may include an index indicating the initial RS or default RS.

[0191] The user device measures CSI by using the SSB1 of candidate cell 1, the SSB4 of candidate cell 2, and SSB1 of candidate cell 3 (S811).

[0192] If the measured CSI value is under the each of the thresholds 1, 2 and 3 corresponding to the RSs, the user device may transmit a LTM LI measurement report to the network device via the uplink resource of the source cell (S813).

[0193] The LTM LI measurement report may comprise RSRP and information indicative of associated reference signals for subset of RSI along with an index indicating the RSI. The CSI report configuration may include the information of maximum number of reference signals (equal or less the number of reference signals configured in the resource set) for which measurements to be included in a single instance of a report, based on that the user device may only report a certain number of measurements.

[0194] The user device 100 may periodically perform the RSI measurement (S815). If the CSI measurement value of SSB1 corresponding to the candidate cell 1 is over the threshold 1, this triggers the user device to perform a CSI measurement on RS2. Then, the user device selects the RS2 that having CSI-RSs quasi collocated with the SSB1.

[0195] The user device 100 performs the CSI measurement on RS2 by using the CSI-RS1, CSI-RS2, CSI-RS3 and CSI-RS4 from the candidate cell 1. The user device transmits LTM LI measurement report including RSRPs for subset of RS2 along with an index indicating the RS2 (S817).

[0196] The user device 100 may periodically perform the RSI measurement (S819). If the CSI measurement value of SSB4 corresponding to the candidate cell 2 (SSB4-C2) is over the threshold 2, this triggers the user device to perform a CSI measurement on RS3. Then, the user device selects the RS3 that having CSI-RSs quasi collocated with the SSB4.

[0197] The user device 100 performs the CSI measurement on RS3 by using the CSI-RS1, CSLRS2, CSLRS3 and CSI-RS4 from the candidate cell2. The user device transmits LTM LI measurement report including RSRPs for subset of RS3 along with an index indicating the RS3 (S821).

[0198] Additionally or alternatively, the user device 100 may perform the RSI measurement as an event triggered manner or when the measurement is triggered by the network device.

[0199] Additionally or alternatively, the steps S815 and S819 may be performed separately or sequentially.

[0200] The method explained in FIG. 8 may comprise three phases such as 1) initial measurement phase, 2) activating / deactivating measurement on a resource set phase, and 3) CSI measurement reporting phase. The initial measurement phase may include steps S801 to S811. The activating / deactivating measurement on a resource set phase may includes S811 , S815, S819. The CSI measurement reporting phase may include S813, S817, and S821.

[0201] Hereinafter, the three phases will be explained more in detail.

[0202] 1. Initial Measurements phase

[0203] In one embodiment, after receiving the CSI report configuration, the UE may be configured to perform measurements on reference signals (if they are active) associated with the initial / default resource set(s).

[0204] 2. Activating / Deactivating measurements on a resource set phase

[0205] In one embodiment, the UE may start performing CSI measurements on reference signals of a resource set when a condition (e.g., criterion or threshold) that is evaluated by the UE is met.

[0206] In one aspect, for a resource set, evaluation conditions may be configured for the UE to trigger measurements on the reference signals associated with the resource set. In another aspect, for a resource set, evaluation conditions may be predefined and stored by the memory of the user device to trigger measurements on the reference signals associated with the resource set.

[0207] In one aspect, the UE may be configured to trigger measurements on a resource set based on the measurements of another resource set(s).

[0208] For example, the UE may start measurements for a resource set if the measurements on quasi collocated (QCL) source reference signals for the reference signals of the resource set satisfy a condition (e.g., measurement above a threshold). In the above example, if the resource pair (SSB1, Cand Cell 1) of Resource Set 1 is a QCL source RS for all the CSLRSs in Resource Set 2, then if the measurement on (SSB1, Cand Cell 1) of Resource Set 1 is above a threshold, then the UE may start measurements on Resource Set 2. Similarly, in case of if the measurements on both resource pair (SSB1, Cand Cell 1) and (SSB4, Cand Cell 2) of Resource Set 1 are above a threshold, then the UE may start measurements on Resource Set 2 and 3.

[0209] In another example, if measurement on (SSB1, Cand Cell 3) of Resource Set 1 is above a threshold, then the UE may start measurements on Resource Set 4 and 5.

[0210] In one aspect, on the triggering of measurements on a new resource set, the UE may stop performing CSI measurements used to evaluate the condition. For example, when the UE starts measurements on Resource Set 2 based on the CSI measurement on (SSB1, Cand Cell 1) of Resource Set 1, then UE may stop performing measurements on (SSB1, Cand Cell 1).

[0211] In another aspect, on the triggering of measurements on a new resource set, the UE may continue performing the measurements used to evaluate the condition. For example, when based on the measurement on resource (SSB1, Cand Cell 1) of Resource Set 1 the UE starts measurements on Resource Set 2, then UE may continue making measurements on (SSB1, Cand Cell 1).

[0212] In another aspect, a priority may be assigned to resource sets to triggermeasurements. For example, in the above figure, for candidate cell 3 measurements, Resource Set 4 can be assigned higher priority than Resource Set 5. When measurement on (SSB1, Cand Cell 3) of Resource Set 1 is above a threshold, then the UE may start measurements on Resource Set 4. But, if measurement on (SSB1, Cand Cell 3) of Resource Set 1 is above a threshold and measurements on RSs of Resource Set 4 are below a threshold, the UE can start making measurement on RSs of Resource Set 5.

[0213] In a variant of the embodiment, the priority of the resource sets is defined based on their time-domain activation profile. As an example, periodic CSI-RSs are assigned higher priority than semi-persistent CSI-RSs, which are assigned higher priority than aperiodic CSI- RSs. The motivation for such prioritization lies in the fact that periodic CSI-RS are associated with less activation signalling overhead, hence from the network’s viewpoint they are preferred to be used for UE measurements, provided of course that they are measured with sufficient quality.

[0214] In one example embodiment, the UE may be configured to update measurements on N resource sets.

[0215] In one embodiment, the UE may determine to update (CSI-RS) measurements for N (equal or greater than 1) resource sets, wherein the N resource sets are selected:- based on N highest SSBs associated with the CSI-RS, wherein the SSBs are from different resource sets;- based on N highest cell qualities (based on SSBs, and / or L3 measurements) associated with CSI-RS included in the resource sets; and / or- based on N highest SSBs so that at least on of each selected SSB is from different cell (N is an integer value equal to or greater than 1).

[0216] In one example, the TCI activation status for specific cell or cells may limit also the TCI activation could limit the SSBs to be on one cell.

[0217] As a further example, the UE may select up to N or N resource set for which it updates the measurements based on one or more condition as listed above.

[0218] In one embodiment, the UE may stop performing the measurements on the reference signals of a resource set when a condition that is evaluated by the UE is met.

[0219] In one aspect, for a resource set, evaluation conditions may be configured for the UE to stop measurements on the reference signals associated with the resource set. Forexample, in the reference of the above figure, if the highest measurement from all reference signals of Resource Set 2 is below a threshold, then the UE may stop measurements on Resource Set 2.

[0220] In one aspect, the UE may be configured to stop measurements on a resource set based on the measurements of another resource set(s). For example, the UE may stop measurements for a resource set if the measurements on the QCL source reference signals for the reference signals of the resource set satisfy a condition (e.g., measurement below a threshold). In the above example, if the measurement on (SSB1, Cand Cell 1) of Resource Set 1 is below a threshold, then the UE may stop measurements on Resource Set 2.

[0221] 3. Reporting Measurements phase

[0222] In one embodiment, the UE may include a resource set index in the LI report (or, CSI report) when reporting the CSI measurements of a resource set. The number of bits for the resource set index may be determined based on the total number of resource sets associated with the report configuration. For example, in Fig. 6, for five resource sets, three bits can be used for a resource set index (000 for Resource Set 1, 001 for Resource Set 2, 010 for Resource Set 3, 011 for Resource Set 4, and so on).

[0223] In one embodiment, at a given time, when the UE is performing measurements corresponding to more than one resource set, the UE may be configured to report measurements from only one resource set in a reporting instance.

[0224] In case of CSI measurements from more than one resource sets available for reporting,- the UE may report the resource set with the lowest or highest resource set index;- the UE may report the resource set having the largest measurement value (e.g., Ll- RSRP);- the UE may report the resource set containing reference signal(s) from the lowest or highest candidate cell index;- the UE may report the resource set containing a reference signal or reference signals of candidate cell(s) for which the TA has been acquired;- the UE may report the resource set containing a reference signal or reference signals of candidate cell(s) for which an early PRACH transmission has been performed; and / or- the UE may report the resource set containing a reference signal or reference signals of candidate cell(s) associated with one or more activated TCI states.

[0225] In one aspect of the embodiment, a priority order may also be given (or, configured) to the UE for the CSI reporting of resource sets. The UE may consider the priority while selecting the resource set for reporting. For example, resource sets with CSI-RSs may be given higher reporting priority compared to resource sets with SSBs. Another example, resource sets with CSI-RSs from a greater number of candidate cells may have higher priority than resource sets with CSI-RSs from a lower number of candidate cells.

[0226] In case of more than one resource sets with the same reporting priority, the above rules may be used.

[0227] Multiple report configurations with the same UL resources

[0228] Hereinafter, methods and apparatus for multiple CSI report configurations with the same uplink resources, as one of the embodiments of the disclosure are explained.

[0229] The embodiment is associated with the option 2 (i.e., the Multiple report configurations sharing the same uplink resources for reporting) and they may be combined with the embodiments explained by using FIGs. 7 and 8.

[0230] FIG. 9 illustrates an embodiment of configuring multiple report configurations having the same uplink resource for transmitting or receiving a CSI report configuration.

[0231] Referring to FIG. 9, the user device (100) is configured to perform a method comprising steps of obtaining (S910) a plurality of channel state information (CSI) report configurations. Each of the plurality of CSI report configuration may comprises at least one resource set associated with reference signals of at least one candidate cell. The plurality of CSI report configurations may be configured with a same uplink resource for transmitting at least one CSI report. A group or the plurality of CSI report configurations configured with a same uplink resource for transmitting at least one CSI report may be configured with an identification (group ID). Multiple of such plurality of CSI report configurations, associated with different group IDs may be configured to distinguish each of the configured group.

[0232] The method further comprising the steps of selecting (S920) at least one CSI report configuration among the plurality of CSI report configurations based on at least one first criterion; performing (S930) at least one CSI measurement based on the selected at least oneCSI report configuration; and transmitting (S940), to a network device via the uplink resource, the at least one CSI report including the at least one CSI measurement.

[0233] In this case, alternatively, the user device 100 may transmit measurements associated with only one CSI reporting configuration at step S940.

[0234] In this case, alternatively, the UE may perform CSI measurements based on all the configured reporting configuration at step S930; and transmit measurements associated with only one CSI reporting configuration at step S940.

[0235] The method may further comprise steps of performing at least one first CSI measurement based on the at least first CSI report configuration among the plurality of CSI report configurations; and selecting one or more second CSI report configuration among the selected at least one CSI report configuration based on the at least one CSI first measurement and at least one second criterion. The at least one second criterion may be configured to the UE or predefined and stored in the memory of user device or / and network device.

[0236] The at least one second criterion may include at least one threshold value related to a layer one reference signal received power (Ll-RSRP), a layer one signal to interference plus Noise Ratio (Ll-SINR), or Reference Signal Received Quality (RSRQ).

[0237] One of the plurality of CSI report configurations may comprise an indication indicative of an initial or default first CSI report configuration to perform and report the at least one first CSI measurement among the plurality of CSI report configurations. In this case, the first CSI report configurations may be more than 1.

[0238] First reference signals indicated by the at least one first report configuration may be Quasi collocated with second reference signals indicated by the at least one second report configuration.

[0239] The method may further comprise a step of stopping performing the at least one first CSI measurement when the one of the at least one second CSI report configuration is selected.

[0240] One of the at least one first criterion may be priority information indicating a priority among the plurality of CSI report configurations.

[0241] The method may further comprise a step of performing a CSI measurement associated with the at least one first CSI report configuration when the at least one second CSI measurement on the selected second resource set is performed.

[0242] The uplink resource may be a Physical Uplink Control Channel (PUCCH) resource or a Physical Uplink Shared Channel (PUSCH) resource.

[0243] The at least one CSI report may further comprise an index of the selected at least one CSI report configuration.

[0244] The number of bits for the index may be determined based on a total number of the plurality of CSI report configurations.

[0245] The plurality of CSI report configurations may be a low layer triggered mobility (LTM) report configurations, and the at least one CSI report may be a layer one (LI) LTM measurement report.

[0246] The method may further comprise a step of: performing CSI measurements based on one or more CSI report configurations other than the selected at least one CSI report configuration.

[0247] The at least one first criterion may be configured to the UE or predefined and stored in the memory of the user device or / and network device. The at least one first criterion may be at least one of: a report configuration with a CSLRS based measurement has higher priority than a report configuration with a SSB based measurement; a report configuration with a lower report configuration index has higher priority; a report configuration with a reference signal associated with a lowest or highest candidate cell index; a report configuration with a reference signal or reference signals of a candidate cell for which a Timing Advance, TA, has been acquired; a report configuration with a reference signal or reference signals of a candidate cell for which an early Physical Random Access Channel, PRACH, transmission has been performed; and / or a report configuration with a reference signal or reference signals of a candidate cell associated with one or more activated Transmission Configuration Index, TCI, states.

[0248] The plurality of CSI reporting configurations may be assigned with a priority order for reporting when CSI measurements from more than one reporting configurations are available for reporting.

[0249] The priority order may indicate that a CSI report configuration comprising a resource set related to a Channel State Information reference signal (CSI-RS) has a higher priority than a CSI report configuration comprising a resource set related to a Synchronization Signal Block (SSB).

[0250] The priority order may indicate that a CSI report configuration comprising a resource set related to CSI-RSs from a greater number of candidate cells has a higher priority than a CSI report configuration comprising a resource set related to CSI-RSs from a lower number of candidate cells.

[0251] Alternatively, the method may further comprise another criterion for reporting when CSI measurements from more than one reporting configurations are available for reporting. The criterion may be configured to the UE or predefined in the memory of the user device or / and network device. The criterion may be at least one of a report configuration with a CSI-RS based measurement has higher priority than a report configuration with a SSB based measurement; a report configuration with the largest measurement value (e.g., Ll-RSRP) ; a report configuration with measurements of a reference signal associated with a lowest or highest candidate cell index; a report configuration with measurements of a reference signal or reference signals of a candidate cell for which a Timing Advance, TA, has been acquired; a report configuration with measurements of a reference signal or reference signals of a candidate cell for which an early Physical Random Access Channel, PRACH, transmission has been performed; and / or a report configuration with measurements a reference signal or reference signals of a candidate cell associated with one or more activated Transmission Configuration Index, TCI, states.

[0252] FIG. 9 also discloses the method performed by the network device 104.

[0253] The method performed by the network device 104 comprises steps of transmitting, to a user device, a plurality of channel state information (CSI) report configurations and receiving, from the user device via the uplink resource, at least one CSI report including the at least one CSI measurement. In this case, at least one CSI report may be only one CSI report that has been selected by the user device 100.

[0254] Each of the plurality of CSI report configuration may comprise at least one resource set associated with reference signals of at least one candidate cell. The plurality of CSI report configurations may be configured with a same uplink resource for transmitting at least one CSI report. The plurality of CSI report configurations configured with a same uplink resource for transmitting at least one CSI report may be configured with an identification (e.g., group ID). Multiple of such plurality of CSI report configurations, associated with different group IDs may be configured.

[0255] One of the plurality of CSI report configurations may comprise an indication indicative of the at least one first CSI report configuration to perform and report the at least one first CSI measurement among the plurality of CSI report configurations.

[0256] The first reference signals indicated by at least one first report configuration of the plurality of CSI report configurations may be Quasi collocated with the second reference signals indicated by at least one second report configuration of the plurality of CSI report configurations.

[0257] The uplink resource may be a Physical Uplink Control Channel (PUCCH) resource or a Physical Uplink Shared Channel (PUSCH) resource.

[0258] The at least one CSI report may further comprise an index of the selected at least one CSI report configuration.

[0259] The number of bits for the index may be determined based on a total number of the plurality of CSI report configurations.

[0260] The plurality of CSI report configuration may be a low layer triggered mobility (LTM) report configuration, and the at least one CSI report is a layer one (LI) LTM measurement report.

[0261] The plurality of CSI report configuration may further comprise at least one first criterion. Alternatively, the at least one first criterion may be predefined and stored in the memory of user device or / and network device. The at least one first criterion is at least one of: a report configuration with a CSLRS based measurement has higher priority than a report configuration with a SSB based measurement; a report configuration with a lower report configuration index has higher priority; a report configuration with a reference signal associated with a lowest or highestcandidate cell index; a report configuration with a reference signal or reference signals of a candidate cell for which a Timing Advance, TA, has been acquired; a report configuration with a reference signal or reference signals of a candidate cell for which an early Physical Random Access Channel, PRACH, transmission has been performed; and / or a report configuration with a reference signal or reference signals of a candidate cell associated with one or more activated Transmission Configuration Index, TCI, states

[0262] The plurality of CSI reporting configurations may be assigned with a priority order for reporting when CSI measurements from more than one reporting configurations are available for reporting.

[0263] The priority order may indicate that a CSI report configuration comprising a resource set related to a Channel State Information reference signal (CSI-RS) has a higher priority than a CSI report configuration comprising a resource set related to a Synchronization Signal Block (SSB).

[0264] The priority order may indicate that a CSI report configuration comprising a resource set related to CSI-RSs from a greater number of candidate cells has a higher priority than a CSI report configuration comprising a resource set related to CSI-RSs from a lower number of candidate cells.

[0265] Alternatively, the another criterion may used for reporting when CSI measurements from more than one reporting configurations are available for reporting. The criterion may be configured to the UE or predefined in the memory of the user device or / and network device. The criterion may be at least one of a report configuration with a CSI-RS based measurement has higher priority than a report configuration with a SSB based measurement; a report configuration with the largest measurement value (e.g., Ll-RSRP) ; a report configuration with measurements of a reference signal associated with a lowest or highest candidate cell index; a report configuration with measurements of a reference signal or reference signals of a candidate cell for which a Timing Advance, TA, has been acquired;a report configuration with measurements of a reference signal or reference signals of a candidate cell for which an early Physical Random Access Channel, PRACH, transmission has been performed; and / or a report configuration with measurements a reference signal or reference signals of a candidate cell associated with one or more activated Transmission Configuration Index, TCI, states.

[0266] FIG. 10 illustrates the other embodiment of configuring multiple report configurations having the same uplink resource for transmitting or receiving a CSI report configuration.

[0267] Steps S1001 to S1005 of FIG. 10 are the same with steps S801-S805, thus the explanation of the steps SI 001 -SI 005 can be replaced with the explanation of corresponding steps of FIG. 8.

[0268] The network device 104 may transmit a group of LTM CSI report configurations to the user device 100 (SI 007).

[0269] Alternatively, the group of LTM CSI report configurations may be preconfigured to the user device 100. In this case, the network device 104 does not need to perform the step 1007.

[0270] The group of LTM CSI reporting configurations may be configured to the user device 104 with the same PUCCH resources allocated for at least one LTM CSI reporting. The user device may perform measurements for one or more (e.g., all) reporting configuration. Alternatively, the user device may be configured to select only certain reporting configurations to perform measurements. At the time of LTM CSI reporting, when the user device 100 has measurements available to report for two or more LTM CSI report configurations associated with the same group, the user device may select one based on a criterion. The criterion may be at least one of a report configuration with a CSLRS based measurement has higher priority than a report configuration with a SSB based measurement; a report configuration with the largest measurement value (e.g., Ll-RSRP) ; a report configuration with measurements of a reference signal associated with a lowest or highest candidate cell index;a report configuration with measurements of a reference signal or reference signals of a candidate cell for which a Timing Advance, TA, has been acquired; a report configuration with measurements of a reference signal or reference signals of a candidate cell for which an early Physical Random Access Channel, PRACH, transmission has been performed; and / or a report configuration with measurements a reference signal or reference signals of a candidate cell associated with one or more activated Transmission Configuration Index, TCI, states.

[0271] When the user device 100 receives the group of LTM CSI report configurations, the user device 100 may start performing measurement on resource set associated with reporting configuration 1 (SI 009).

[0272] The reporting configuration 1 may be set as an initial reporting configuration or a default reporting configuration for measuring CSI. Alternatively, the network device may transmit an index indicating the initial reporting configuration.

[0273] The user device 100 may select at least one CSI report configuration based on the at least one first criterion (e.g., threshold or condition) (S1011).

[0274] The at least one first criterion to select LTM CSI report configurations may be at least one of a report configuration with CSI-RS measurements may have higher priority than the report with SSB based measurements, a report configuration with lower report configuration index may have higher priority, a report configuration with the largest measurement value (e.g., Ll-RSRP), a report configuration with measurements associated with the lowest or highest candidate cell index, a report configuration with measurements containing a reference signal or reference signals of candidate cell(s) for which the TA has been acquired, a report configuration with measurements containing a reference signal or reference signals of candidate cell(s) for which an early PRACH transmission has been performed, and / or a report configuration with measurements containing a reference signal or referencesignals of candidate cells associated with one or more activated TCI states.

[0275] Alternatively or additionally, the group of LTM CSI reporting configurations with the same PUCCH resources may be assigned to the user device with priority order. The UE may use the given priority order to resolve the collision when the measurements from two or more reporting configuration are available to report and the UE may report measurements only for one report. For example, a LTM CSI report configuration with a resource set containing CSLRSs may be given a higher reporting priority compared to the LTM CSI report configuration with a resource set containing SSBs.

[0276] Another example, a LTM CSI report configuration with a resource set containing CSLRSs from a greater number of candidate cells may have higher priority than a LTM CSI report configuration with a resource set containing with CSLRSs from a lower number of candidate cells. In case of more than one reports with the same reporting priority, the above rules may be used.

[0277] The user device may perform at least one CSI measurements based on the selected at least one LTM CSI report configuration. And then the user device may transmit a LTM CSI report including a measurement result (e.g., RSRP for subset of RS of the LTM CSI report configuration) (S 1013).

[0278] In one embodiment, the user device may include an index (e.g., the LTM CSI report configuration index) in the LTM CSI report at S1013, when reporting the measurements associated with the selected LTM CSI report configuration. The number of bits for the report configuration index may be determined based on the total number of report configurations associated with the same group (e.g., same PUCCH resources).

[0279] FIG. 11 illustrates an example of an apparatus 1100 comprising means for performing one or more of the example embodiments described above. For example, the apparatus 1100 may be, or comprise, or be comprised in, the user device 100.

[0280] The apparatus 1100 may comprise a circuitry or a chipset applicable for realizing one or more of the example embodiments described above. For example, the apparatus 1100 may comprise at least one processor 1110. The at least one processor 1110 interprets instructions (e.g., computer program instructions) and processes data. The at least one processor 1110 may comprise one or more programmable processors. The at least one processor 1110 may comprise programmable hardware with embedded firmware and may,alternatively or additionally, comprise one or more application-specific integrated circuits (ASICs).

[0281] The at least one processor 1110 is coupled to at least one memory 1120. The at least one processor is configured to read and write data to and from the at least one memory 1120. The at least one memory 1120 may comprise one or more memory units. The memory units may be volatile or non-volatile. It is to be noted that there may be one or more units of nonvolatile memory and one or more units of volatile memory or, alternatively, one or more units of non-volatile memory, or, alternatively, one or more units of volatile memory. Volatile memory may be for example random-access memory (RAM), dynamic random-access memory (DRAM) or synchronous dynamic random-access memory (SDRAM). Non-volatile memory may be for example read-only memory (ROM), programmable read-only memory (PROM), electronically erasable programmable read-only memory (EEPROM), flash memory, optical storage or magnetic storage. In general, memories may be referred to as non- transitory computer readable media. The term “non-transitory,” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM). The at least one memory 1120 stores computer readable instructions that are executed by the at least one processor 1110 to perform one or more of the example embodiments described above. For example, non-volatile memory stores the computer readable instructions, and the at least one processor 1110 executes the instructions using volatile memory for temporary storage of data and / or instructions. The computer readable instructions may refer to computer program code.

[0282] The computer readable instructions may have been pre-stored to the at least one memory 1120 or, alternatively or additionally, they may be received, by the apparatus, via an electromagnetic carrier signal and / or may be copied from a physical entity such as a computer program product. Execution of the computer readable instructions by the at least one processor 1110 causes the apparatus 1100 to perform one or more of the example embodiments described above. That is, the at least one processor and the at least one memory storing the instructions may provide the means for providing or causing the performance of any of the methods and / or blocks described above.

[0283] In the context of this document, a “memory” or “computer-readable media” or “computer-readable medium” may be any non-transitory media or medium or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.The term “non-transitory,” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM).

[0284] The non-transitory computer readable medium may comprise program instructions which, when executed by an apparatus, cause the apparatus to perform at least the following: A non-transitory computer readable medium comprising instructions which, when executed by a user device, cause the user device to perform at least the following: obtaining a channel state information, CSI, report configuration comprising a first list indicating at least one first resource set associated with first reference signals of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and information indicative of uplink resources for a CSI report; performing at least one first CSI measurement on the at least one first resource set; selecting one or more resource sets from the at least one second resource set based on the at least one first CSI measurement and at least one criterion; performing at least one second CSI measurement on the selected one or more second resource sets; and transmitting the CSI report including the at least one second CSI measurement to a network device using the uplink resources.

[0285] The non-transitory computer readable medium may comprise program instructions which, when executed by an apparatus, cause the apparatus to perform at least the following: obtaining a plurality of channel state information (CSI) report configurations, each of the plurality of CSI report configuration comprising at least one resource set associated with reference signals of at least one candidate cell, wherein the plurality of CSI report configurations are configured with a same uplink resource for transmitting at least one CSI report; selecting at least one CSI report configuration among the plurality of CSI report configurations based on at least one first criterion; performing at least one CSI measurement based on the selected at least one CSI report configuration; and transmitting, to a network device via the uplink resource, the at least one CSI report including the at least one CSI measurement.

[0286] The apparatus 1100 may further comprise, or be connected to, an input unit 1130. The input unit 1130 may comprise one or more interfaces for receiving input. The one or more interfaces may comprise for example one or more temperature, motion and / or orientation sensors, one or more cameras, one or more accelerometers, one or more microphones, one or more buttons and / or one or more touch detection units. Further, the input unit 1130 may comprise an interface to which external devices may connect to.

[0287] The apparatus 1100 may also comprise an output unit 1140. The output unit may comprise or be connected to one or more displays capable of rendering visual content, such as a light emitting diode (LED) display, a liquid crystal display (LCD) and / or a liquid crystal on silicon (LCoS) display. The output unit 1140 may further comprise one or more audio outputs. The one or more audio outputs may be for example loudspeakers.

[0288] The apparatus 1100 further comprises a connectivity unit 1150. The connectivity unit 1150 enables wireless connectivity to one or more external devices. The connectivity unit 1150 comprises at least one transmitter and at least one receiver that may be integrated to the apparatus 1100 or that the apparatus 1100 may be connected to. The at least one transmitter comprises at least one transmission antenna, and the at least one receiver comprises at least one receiving antenna. The connectivity unit 1150 may comprise an integrated circuit or a set of integrated circuits that provide the wireless communication capability for the apparatus 1100. Alternatively, the wireless connectivity may be a hardwired application-specific integrated circuit (ASIC). The connectivity unit 1150 may also provide means for performing at least some of the blocks or functions of one or more example embodiments described above. The connectivity unit 1150 may comprise one or more components, such as: power amplifier, digital front end (DFE), analog-to-digital converter (ADC), digital-to-analog converter (DAC), frequency converter, (de)modulator, and / or encoder / decoder circuitries, controlled by the corresponding controlling units.

[0289] It is to be noted that the apparatus 1100 may further comprise various components not illustrated in FIG. 11. The various components may be hardware components and / or software components.

[0290] The apparatus 1100 may perform or be applied with the embodiments described above. More specifically, the apparatus 1100 may be the user device 100, and the user device 100 may be configured to perform the methods explained by using FIGs 2 to 10.

[0291] FIG. 12 illustrates an example of an apparatus 1200 comprising means for performing one or more of the example embodiments described above. For example, the apparatus 1200 may be an apparatus such as, or comprising, or comprised in, the network node 104 or the network entity, and support the embodiments and examples described above.

[0292] The network node 104 may also be referred to, for example, as a network element, a next generation radio access network (NG-RAN) node, a NodeB, an eNB, a gNB, a basetransceiver station (BTS), a base station, an NR base station, a 5G base station, an access node, an access point (AP), a cell site, a relay node, a repeater, an integrated access and backhaul (IAB) node, an IAB donor node, a distributed unit (DU), a central unit (CU), a baseband unit (BBU), a radio unit (RU), a radio head, a remote radio head (RRH), or a transmission and reception point (TRP).

[0293] The apparatus 1200 may comprise, for example, a circuitry or a chipset applicable for realizing one or more of the example embodiments described above. The apparatus 1200 may be an electronic device comprising one or more electronic circuitries. The apparatus 1200 may comprise a communication control circuitry 1210 such as at least one processor, and at least one memory 1220 storing instructions 1222 which, when executed by the at least one processor, cause the apparatus 1200 to carry out one or more of the example embodiments described above. Such instructions 1222 may, for example, include computer program code (software). The at least one processor and the at least one memory storing the instructions may provide the means for providing or causing the performance of any of the methods and / or blocks described above.

[0294] The processor is coupled to the memory 1220. The processor is configured to read and write data to and from the memory 1220. The memory 1220 may comprise one or more memory units. The memory units may be volatile or non-volatile. It is to be noted that there may be one or more units of non-volatile memory and one or more units of volatile memory or, alternatively, one or more units of non-volatile memory, or, alternatively, one or more units of volatile memory. Volatile memory may be for example random-access memory (RAM), dynamic random-access memory (DRAM) or synchronous dynamic random-access memory (SDRAM). Non-volatile memory may be for example read-only memory (ROM), programmable read-only memory (PROM), electronically erasable programmable read-only memory (EEPROM), flash memory, optical storage or magnetic storage. In general, memories may be referred to as non-transitory computer readable media. The term “non- transitory,” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM). The memory 1220 stores computer readable instructions that are executed by the processor. For example, nonvolatile memory stores the computer readable instructions, and the processor executes the instructions using volatile memory for temporary storage of data and / or instructions.

[0295] The computer readable instructions may have been pre-stored to the memory 1220 or, alternatively or additionally, they may be received, by the apparatus, via anelectromagnetic carrier signal and / or may be copied from a physical entity such as a computer program product. Execution of the computer readable instructions causes the apparatus 1200 to perform one or more of the functionalities described above.

[0296] The memory 1220 may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and / or removable memory. The memory may comprise a configuration database for storing configuration data, such as a current neighbour cell list, and, in some example embodiments, structures of frames used in the detected neighbour cells.

[0297] In some example embodiments a non-transitory computer readable medium may be provided. The non-transitory computer readable medium may comprise program instructions which, when executed by an apparatus, cause the apparatus to perform at least the following: receiving an original minimization of driving test, MDT, configuration; receiving an indication indicating whether all or a part of the original MDT configuration is allowed to be modified; configuring a modified MDT configuration from the original MDT configuration based on the indication; and transmitting the modified MDT configuration.

[0298] In some example embodiments a non-transitory computer readable medium may be provided. The non-transitory computer readable medium may comprise program instructions which, when executed by an apparatus, cause the apparatus to perform at least the following: transmitting, to a user device, a channel state information (CSI) report configuration comprising a first list indicating at least one first resource set associated with first reference signal of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and information indicative of uplink resources for a CSI report; and receiving, from the user device, the CSI report including the at least one second CSI measurement using the uplink resources.

[0299] In some example embodiments a non-transitory computer readable medium may be provided. The non-transitory computer readable medium may comprise program instructions which, when executed by an apparatus, cause the apparatus to perform at least the following: transmitting, to a user device, a plurality of channel state information (CSI) report configurations, each of the plurality of CSI report configuration comprising at least one resource set associated with reference signals of at least one candidate cell, wherein the plurality of CSI report configurations are configured with a same uplink resource fortransmitting at least one CSI report; and receiving, from the user device via the uplink resource, the at least one CSI report including the at least one CSI measurement.

[0300] Referring back to Fig. 12, the apparatus 1200 may further comprise or be connected to a communication interface 1230, such as a radio unit, comprising hardware and / or software for realizing communication connectivity with one or more wireless communication devices according to one or more communication protocols. The communication interface 1230 comprises at least one transmitter (Tx) and at least one receiver (Rx) that may be integrated to the apparatus 1200 or that the apparatus 1200 may be connected to. The communication interface 1230 may provide means for performing some of the blocks for one or more example embodiments described above. The communication interface 1230 may comprise one or more components, such as: power amplifier, digital front end (DFE), analog-to-digital converter (ADC), digital-to-analog converter (DAC), frequency converter, (de)modulator, and / or encoder / decoder circuitries, controlled by the corresponding controlling units.

[0301] The communication interface 1230 provides the apparatus with radio communication capabilities to communicate in the wireless communication network. The communication interface may, for example, provide a radio interface to one or more wireless communication devices. The apparatus 1200 may further comprise or be connected to another interface towards a core network such as the network coordinator apparatus or AMF, and / or to the access nodes of the wireless communication network.

[0302] The apparatus 1200 may further comprise a scheduler 1240 that is configured to allocate radio resources. The scheduler 1240 may be configured along with the communication control circuitry 1210 or it may be separately configured.

[0303] It is to be noted that the apparatus 1200 may further comprise various components not illustrated in FIG. 12. The various components may be hardware components and / or software components.

[0304] The apparatus 1200 may perform or be applied with the embodiments described above. More specifically, the apparatus 1200 may be the network device 104, and the network device 104 may be configured to perform the methods explained by using FIGs 2 to 10.

[0305] The techniques and methods described herein may be implemented by various means. For example, these techniques may be implemented in hardware (one or more devices), firmware (one or more devices), software (one or more modules), or combinationsthereof. For a hardware implementation, the apparatus(es) of example embodiments may be implemented within one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), graphics processing units (GPUs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof. For firmware or software, the implementation can be carried out through modules of at least one chipset (for example procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory unit and executed by processors. The memory unit may be implemented within the processor or externally to the processor. In the latter case, it can be communicatively coupled to the processor via various means, as is known in the art. Additionally, the components of the systems described herein may be rearranged and / or complemented by additional components in order to facilitate the achievements of the various aspects, etc., described with regard thereto, and they are not limited to the precise configurations set forth in the given figures, as will be appreciated by one skilled in the art.

[0306] It will be obvious to a person skilled in the art that, as technology advances, the inventive concept may be implemented in various ways. The embodiments are not limited to the example embodiments described above, but may vary within the scope of the claims. Therefore, all words and expressions should be interpreted broadly, and they are intended to illustrate, not to restrict, the embodiments.

Claims

WHAT IS CLAIMED IS:

1. A user device comprising at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the user device at least to: obtain a channel state information, CSI, report configuration comprising a first list indicating at least one first resource set associated with first reference signals of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and information indicative of uplink resources for a CSI report; perform at least one first CSI measurement on the at least one first resource set; select one or more resource sets from the at least one second resource set based on the at least one first CSI measurement and at least one criterion; perform at least one second CSI measurement on the selected one or more second resource sets; and transmit the CSI report including the at least one second CSI measurement to a network device using the uplink resources.

2. The user device of claim 1, wherein the CSI report configuration is a low layer triggered mobility, LTM, report configuration, and the CSI report is a layer one, LI, LTM measurement report.

3. The user device of claim 1 or 2, wherein the CSI report configuration comprises an indication indicative of an initial resource set of the at least one first resource set to perform the at least one first measurement.

4. The user device of any one of claims 1 to 3, wherein the at least one first resource set or the at least one second resource set includes at least one synchronization signal block, SSB, index indicating at least one SSB from the at least one candidate cell and at least one candidate cell index related to the at least one candidate cell.

5. The user device of any one of claims 1 to 4, wherein the at least one first resource set or the at least one second resource set includes at least one channel state informationreference signal, CSI-RS, index indicating at least one CSI-RS from the at least one candidate cell and at least one candidate cell index related to the at least one candidate cell.

6. The user device of any one of claims 1 to 5, wherein the CSI report configuration further comprises information indicating the at least one criterion, andwherein the at least one criterion includes at least one threshold value related to a layer one reference signal received power, Ll-RSRP, a layer one signal to interference plus Noise Ratio, Ll-SINR, or Reference Signal Received Quality, RSRQ.

7. The user device of any one of claims 1 to 6, wherein the user device is further caused to: perform a measurement on the at least one first resource set when the at least one second measurement on the selected second resource set is performed.

8. The user device of any one of claims 1 to 7, wherein the user device is further caused to: transmit a CSI report including a result of the at least one first CSI measurement, via the uplink resource.

9. The user device of any one of claims 1 to 8, wherein the CSI report configuration contains one or more resource configurations including one of the at least one first resource set and the at least one second resource set.

10. The user device of any one of claims 1 to 9, wherein the first reference signals indicated by the at least one first resource set is Quasi collocated with the second reference signals indicated by the at least one second resource set.

11. The user device of any one of claims 1 to 10, wherein the user device is further caused to: stop performing the at least one first CSI measurement when the one of the at least one second resource set is selected.

12. The user device of any one of claims 1 to 11, wherein one of the at least one criterion is priority information indicating a priority among the at least one second resource set.

13. The user device of any one of claims 1 to 12, wherein the user device is further caused to: stop performing the at least one second CSI measurement when a condition is met.

14. The user device of claim 13, wherein the condition is one of: a threshold value related to the at least one second CSI measurement of the selected second resource set, and a threshold value related to the at least one first CSI measurement of the at least onefirst resource set.

15. The user device of any one of claims 1 to 14, wherein the CSI report includes at least one index of at least one resource set on which a measurement is performed.

16. The user device of any one of claims 1 to 15, wherein the user device is configured to transmit the CSI report including measurements on only one of two or more resource sets, at a reporting occasion.

17. The user device of any one of claims 1 to 16, wherein the user device is configured to update CSI measurements on N resource sets when the N resource sets are selected, where N is an integer value greater than or equal to 1.

18. The user device of claim 17, wherein the CSI measurements of one of two or more resource sets are reported based on at least one criterion of a resource set with a lowest or highest resource set index; a resource set having a largest measurement value; a resource set containing a reference signal from the lowest or highest candidate cell index; a resource set containing a reference signal of a candidate cell for which a timing advance, TA, has been acquired; a resource set containing a reference signal of a candidate cell for which an early physical random access channel, PRACH, transmission has been performed; or a resource set containing a reference signal of a candidate cell associated with one or more activated transmission configuration index, TCI, states.

19. The user device of claim 17, wherein the CSI measurements of one of two or more resource sets are selected for reporting based on a priority among the two or more resource sets.

20. A network device comprising at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to: transmit, to a user device, a channel state information, CSI, report configuration comprising a first list indicating at least one first resource set associated with first reference signal of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and information indicative of uplink resources for a CSI report; and receive, from the user device, the CSI report including the at least one second CSImeasurement using the uplink resources.

21. The network device of claim 20, wherein the CSI report configuration is a low layer triggered mobility, LTM, report configuration, and the CSI report is a layer one, LI, LTM measurement report.

22. The network device of claim 20 or 21, wherein the CSI report configuration comprises an indication indicative of an initial resource set of the at least one first resource set to perform the at least one first measurement.

23. The network device of any one of claims 20 to 22, wherein the at least one first resource set or the at least one second resource set includes at least one synchronization signal block, SSB, index indicating at least one SSB from the at least one candidate cell and at least one candidate cell index related to the at least one candidate cell.

24. The network device of any one of claims 20 to 23, wherein the at least one first resource set or the at least one second resource set includes at least one channel state information-reference signal, CSLRS, index indicating at least one CSLRS from the at least one candidate cell and at least one candidate cell index related to the at least one candidate cell.

25. The network device of any one of claims 20 to 24, wherein the CSI report configuration further comprises information indicating the at least one criterion, and wherein the at least one criterion includes at least one threshold value related to a layer one reference signal received power, Ll-RSRP, a layer one signal to interference plus Noise Ratio, Ll-SINR, or Reference Signal Received Quality, RSRQ.

26. The network device of any one of claims 20 to 25, wherein the network device is further caused to: receive a CSI report including a result of the at least one first CSI measurement, via the uplink resources.

27. The network device of any one of claims 20 to 26, wherein the CSI report configuration contains one or more resource configurations including one of the at least one first resource set and the at least one second resource set.

28. The network device of any one of claims 20 to 27, wherein the first reference signals indicated by the at least one first resource set is Quasi collocated with the second reference signals indicated by the at least one second resource set.

29. The network device of any one of claims 20 to 28, wherein the CSI report includes at least one index of at least one resource set on which a measurement is performed.

30. The network device of any one of claims 20 to 29, wherein the network device configures the user device to transmit the CSI report including measurements on only one of two or more resource sets, at a reporting occasion.

31. The network device of any one of claims 20 to 30, wherein the network device configures the user device to update CSI measurements on N resource sets when the N resource sets are selected, where N is an integer value greater than 1.

32. The network device of claim 31, wherein the CSI measurements of one of two or more resource sets are reported based on at least one criterion of: a resource set with a lowest or highest resource set index; a resource set having a largest measurement value; a resource set containing a reference signal from the lowest or highest candidate cell index; a resource set containing a reference signal of a candidate cell for which a timing advance, TA, has been acquired; a resource set containing a reference signal of a candidate cell for which an early physical random access channel, PRACH, transmission has been performed; or a resource set containing a reference signal of a candidate cell associated with one or more activated transmission configuration index, TCI, states.

33. The network device of claim 32, wherein the CSI measurements of one of two or more resource sets are selected for reporting based on a priority among the two or more resource sets.

34. A method comprising: obtaining a channel state information, CSI, report configuration comprising a first list indicating at least one first resource set associated with first reference signals of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and information indicative of uplink resources for a CSI report; performing at least one first CSI measurement on the at least one first resource set; selecting one or more resource sets from the at least one second resource set based on the at least one first CSI measurement and at least one criterion;performing at least one second CSI measurement on the selected one or more second resource sets; and transmitting the CSI report including the at least one second CSI measurement to a network device using the uplink resources.

35. A method comprising: transmitting, to a user device, a channel state information, CSI, report configuration comprising a first list indicating at least one first resource set associated with first reference signal of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and information indicative of uplink resources for a CSI report; and receiving, from the user device, the CSI report including the at least one second CSI measurement using the uplink resources.

36. Anon-transitory computer readable medium comprising instructions which, when executed by a user device, cause the user device to perform at least the following: obtaining a channel state information, CSI, report configuration comprising a first list indicating at least one first resource set associated with first reference signals (SSB) of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals (CSI-RS) of the at least one candidate cell, and information indicative of uplink resources for a CSI report; performing at least one first CSI measurement on the at least one first resource set; selecting one or more resource sets from the at least one second resource set based on the at least one first CSI measurement and at least one criterion; performing at least one second CSI measurement on the selected one or more second resource sets; and transmitting the CSI report including the at least one second CSI measurement to a network device using the uplink resources.

37. Anon-transitory computer readable medium comprising instructions which, when executed by a network device, cause the network device to perform at least the following: transmitting, to a user device, a channel state information, CSI, report configuration comprising a first list indicating at least one first resource set associated with first reference signal of at least one candidate cell, a second list indicating at least one second resource set associated with second reference signals of the at least one candidate cell, and information indicative of uplink resources for a CSI report; and receiving, from the user device, the CSI report including the at least one second CSI measurement using the uplink resources.

Images