Method and apparatus for reporting UE capability information in wireless communication system

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) is provided. The method includes receiving, from a base station, a UE capability enquiry message requesting for capability information of the UE, upon receiving the UE capability enquiry message, setting contents of a UE capability information message, and transmitting, to the base station, the UE capability information message, wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.

Description

METHOD AND APPARATUS FOR REPORTING UE CAPABILITY INFORMATION IN WIRELESS COMMUNICATION SYSTEM

[0001] The present disclosure is related to the field of wireless communication. More particularly, the present disclosure is related to a method and system for capability reporting for lower layer triggered mobility (LTM) measurement in a communication system.

[0002] 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.

[0003] At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.

[0004] Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.

[0005] Moreover, there has been ongoing standardization in air interface architecture / protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture / service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.

[0006] As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.

[0008] In wireless technologies like Fifth Generation (5G) New Radio (NR), devices can move across different cells. Mobility is performed using a procedure called cell reselection in RRC_IDLE mode. Till NR R17, mobility is performed using a procedure called handover in RRC_CONNECTED mode. Network controlled mobility applies to UEs in RRC_CONNECTED. It requires explicit Radio Resource Control (RRC) signaling to be triggered by the gNB (gNodeB) in the NR. Handover in NR usually consists of three steps: handover preparation, handover execution and handover completion. The gNB can configure the UE to report measurements and based on the reported measurements or based on its own understanding of the network topology, the gNB will send RRC Reconfiguration message to handover the UE to another cell called target cell from the source cell. UE accesses the target cell and sends RRC Reconfiguration complete message. In an alternative way introduced in 3gpp NR release 16, the gNB can configure the UE with the execution conditions for triggering handover and once the execution conditions are satisfied, the UE can move to target cell and sends the RRC Reconfiguration complete.

[0009] 3gpp also introduced a new handover called Dual Active Protocol Stack (DAPS) handover in release 16. In all these methods, UE performs handover by sending layer 3 (RRC) messages which causes considerable signaling overhead and latency issues. We can refer to the handover, and Conditional Handover (CHO) as layer 3 mobility. In case of dual connectivity, UE can perform PSCellChange or Conditional PSCellChange. In the context of dual connectivity, we can refer PSCellChange or Conditional PSCellChange also as layer 3 mobility. I.e. Handover, Conditional Handover, PSCellChange, Conditional PSCellChange etc. refers to L3 mobility. We can also refer PSCellChange or Conditional PSCellChange as Secondary CellGroup (SCG) layer 3 mobility and the handover and CHO as a master cell group (MCG) layer 3 mobility in the context of dual connectivity.

[0010] 3gpp release 18 is considering Lower Layers (L1 / L2 layers) Triggered Mobility, also known as LTM to solve the problem related to latency, signaling overhead etc. associated with layer 3 mobility. As per 3gpp, the goal of LTM is to enable a serving cell change via L1 / L2 signaling, in order to reduce the latency, overhead and interruption time. The network (gNB) can configure the UE with multiple candidate cells to allow fast application of configurations for candidate cells. Network can further send MAC CE or L1 signaling to dynamically switch the UE from a source cell to one of the configured candidate cells. Further, LTM can be triggered based on L1 measurements rather than L3 measurements.

[0011] Hence, is desirable to address the above mentioned problems and disadvantages or at least provide a useful alternative.

[0012] The principal object of the embodiments herein is to provide a system and method for capability reporting for LTM measurement in a communication system.

[0013] Another object of the embodiments herein is to enable the UE that sends its capability to include that LTM recovery is supported and also that it supports MCG LTM.

[0014] Yet another object of the embodiments herein is to enable the UE to indicate the support of CSI-RS for LTM measurements including support of intra-frequency LTM measurements based on CSI-RS, intra-frequency LTM measurements based on CSI-RS and the number of frequencies supported for CSI-RS based measurements.

[0015] In an embodiment, a method performed by a user equipment (UE) is provided. The method includes receiving, from a base station, a UE capability enquiry message requesting for capability information of the UE, upon receiving the UE capability enquiry message, setting contents of a UE capability information message, and transmitting, to the base station, the UE capability information message, wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.

[0016] In an embodiment, a method performed by a base station is provided. The method includes transmitting, to a user equipment (UE), a UE capability enquiry message requesting for capability information of the UE, and receiving, from the UE, a UE capability information message, wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.

[0017] In an embodiment, a UE in a wireless communication system is provided. The UE includes a transceiver and a processor. The processor is configured to receive, from a base station via the transceiver, a UE capability enquiry message requesting for capability information of the UE, upon receiving the UE capability enquiry message, set contents of a UE capability information message, and transmit, to the base station via the transceiver, the UE capability information message, wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.

[0018] In an embodiment, a base station in a wireless communication system is provided. The base station includes a transceiver and a processor. The processor is configured to transmit, to a user equipment (UE) via the transceiver, a UE capability enquiry message requesting for capability information of the UE, and receive, from the UE via the transceiver, a UE capability information message, wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.

[0019] In an aspect, the objectives are achieved by providing a method for capability reporting for LTM measurement in a communication system. The method includes receiving a capability enquiry message from a network apparatus. Further, the method includes determining upon receiving the capability enquiry message, whether the UE supports a LTM based recovery and information about a L1-Reference Signal Received Power (RSRP) measurement based on a Channel State Information Reference Signal (CSI-RS). Further, the method includes generating a capability information message by adding at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS. Further, the method includes transmitting the capability information message to the network apparatus.

[0020] In another aspect, the objectives are achieved by providing a method for capability reporting for LTM measurement in a communication system. The method includes transmitting a capability enquiry message to a UE. Further, the method includes receiving a capability information message from the UE. The capability information message comprises at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS. Further, the method includes configuring measurements for performing LTM measurements and a configuration for LTM based recovery based on at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS.

[0021] In another aspect, the objectives are achieved by providing a user equipment (UE) for capability reporting for LTM measurement in a communication system. The UE includes a first memory including information of a network apparatus, a first processor, and a LTM recovery controller communicatively coupled to the first memory and the first processor. The LTM recovery controller receives a capability enquiry message from a network apparatus. Further, the LTM recovery controller determines upon receiving the capability enquiry message, whether the UE supports a LTM based recovery and information about a L1- RSRP measurement based on a CSI-RS. Further, the LTM recovery controller generates a capability information message by adding at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS. Further, the LTM recovery controller transmits the capability information message to the network apparatus.

[0022] In another aspect, the objectives are achieved by providing a network apparatus for capability reporting for LTM measurement in a communication system. The network apparatus includes a second memory, a second processor, and a network LTM recovery controller communicatively coupled to the second memory and the second processor. The network LTM recovery controller transmits a capability enquiry message to a UE. Further, the network LTM recovery controller receives a capability information message from the UE. The capability information message comprises at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS. Further, the network LTM recovery controller configures measurements for performing LTM measurements and a configuration for LTM based recovery based on at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS.

[0023] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications be made within the scope of the embodiments herein.

[0024] These and other features, aspects, and advantages of the present embodiments are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:

[0025] Fig. 1 is a block diagram that illustrates a schematic of a UE implemented to carry out the disclosed subject matter according to an embodiment as disclosed herein.

[0026] Fig. 2 is a block diagram that illustrates a schematic of a network apparatus implemented to carry out the disclosed subject matter according to an embodiment as disclosed herein.

[0027] Fig. 3 is a sequence diagram that illustrates UE capability reporting for LTM according to an embodiment as disclosed herein.

[0028] Fig. 4 is a flow diagram that illustrates a method for capability reporting for LTM measurement in a communication system by the UE according to an embodiment as disclosed herein.

[0029] Fig. 5 is a flow diagram that illustrates a method for capability reporting for LTM measurement in a communication system by the network apparatus according to an embodiment as disclosed herein.

[0030] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. Also, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with a plurality of other embodiments to form new embodiments. The term "or" as used herein, refers to a non-exclusive or, unless otherwise indicated. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein can be practiced and to further enable those skilled in the art to practice the embodiments herein. Accordingly, the examples are not be construed as limiting the scope of the embodiments herein.

[0031] As is existing in the field, embodiments are described and illustrated in terms of blocks that carry out a described function or functions.　These blocks, which referred to herein as managers, units, modules, hardware components or the like, are physically implemented by analog and / or digital circuits such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hardwired circuits, and the like, and optionally be driven by firmware and software. The circuits, for example, be embodied in a plurality of semiconductor chips, or on substrate supports such as printed circuit boards, and the like.　The circuits constituting a block be implemented by dedicated hardware, or by a processor (e.g., a plurality of programmed microprocessors and associated circuitry), or by a combination of dedicated hardware to perform some functions of the block and a processor to perform other functions of the block. Each block of the embodiments be physically separated into two or more interacting and discrete blocks without departing from the scope of the proposed method.　Likewise, the blocks of the embodiments be physically combined into more complex blocks without departing from the scope of the proposed method.

[0032] The accompanying drawings are used to help easily understand various technical features and it is understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the proposed method is construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings. Although the terms first, second, etc. used herein to describe various elements, these elements are not be limited by these terms. These terms are generally used to distinguish one element from another.

[0033] Embodiments disclosed herein provides a system and method for UE capability reporting for LTM in wireless network. The method includes reporting UE's capabilities for the LTM and defining relation between the capabilities. In an embodiment, a UE informs the network apparatus such as gNB whether the UE is capable of performing the inter-frequency LTM measurements without the gap (i.e. UE informs UE's Capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM) in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0034] A detailed description of the LTM from 3gpp documents is give below.

[0035] 3gpp proposes to perform LTM, without reset of lower layers like MAC to avoid data loss and to reduce the additional delay of data recovery wherever it is possible. The gNB Control Unit (CU) can provide LTMCandidateConfiguration, i.e. configure LTM candidate cells through one RRCReconfiguration message for a candidate target cell. The gNB can further release or modify the candidate configurations. A UE can store the LTM configuration of other candidate cells even after moving to a candidate cell through LTM. The gNB CU also can provide the UE with configuration for performing LTM measurements for different candidate frequencies and candidate cells and reporting based on the performed LTM measurements. The gNB can further release or modify the candidate configurations. A UE can store the LTM configuration of other candidate cells even after moving to a candidate cell through LTM. The gNB also can provide the UE with configuration for performing LTM measurements for different candidate frequencies and candidate cells and reporting based on the performed LTM measurements.

[0036] 3gpp supports subsequent LTM, i.e. after one LTM candidate cell becomes a source cell due to LTM, UE can store LTM candidate configuration and continue to report LTM measurements (L1 measurements for LTM) and the new serving cell can send LTM cell switch command to the UE and UE performs LTM. Such an LTM is called subsequent LTM.

[0037] The UE performs the L1 measurements on the source cell and candidate cell and report L1 measurements through Channel State Indicator (CSI) reports to the gNB Distributed Unit (DU) of the source cell. The gNB DU can send a Medium Access Control- Control Element (MAC CE) (for e.g. LTM MAC CE or cell switch MAC CE) asking the UE to switch to another cell which is a LTM candidate cell. UE can perform random access during LTM cell switch, or the cell switch can be RACH less. The LTM cell switch can be guarded by a timer (referred as T3xx in this invention)

[0038] The UE can be requested to perform random access on a candidate cell before the cell switch, so that the network can calculate the timing advance before the cell switch and inform the UE either through a random access response or within the MAC CE which is send for the cell switch. gNB can configure the UE to perform random access towards one or more LTM candidate cells for receiving the Timing Advance (TA) before the cell switch is performed (known as Early TA or Early Sync TA or TA for Early Sync). Random access performed on LTM candidate cells for the timing advance reception is known as random access for early TA. The gNB sends a Physical Downlink Control Channel (PDCCH) order to initiate Random Access Channel (RACH) for TA measurement for candidate cells. The UE receives PDCCH order from the serving cell. Upon reception of this PDCCH order, UE initiates RACH for TA measurement for candidate cells on the one or more candidate cell. UE sends RACH preamble to the candidate cells and receives the Timing Advance (TA) value from the candidate cell. TA for candidate cells can be received from the source cell also. Normally, TA will be received in the random access response, but it can be also received through a MAC CE. If source DU indicates the UE to retransmit the RACH for early TA, UE retransmits the same. gNB can also send PDCCH order to retransmit RACH for TA measurement (also known as RACH for early sync).

[0039] LTM is a procedure in which a gNB receives L1 measurement report(s) from a UE, and on their basis the gNB changes UE's serving cell by a cell switch command signaled via a MAC CE. The cell switch command indicates an LTM candidate cell configuration that the gNB previously prepared and provided to the UE through RRC signaling. Then the UE switches to the target cell according to the cell switch command. The LTM procedure can be used to reduce the mobility latency as described.

[0040] The network can request the UE to perform early TA acquisition of a candidate cell before a cell switch. The early TA acquisition is triggered by PDCCH order [or through UE-based TA measurement].

[0041] The network indicates in the cell switch command whether the UE shall access the target cell with a RA procedure if a TA value is not provided or with PUSCH transmission using the indicated TA value. For RACH-less LTM, the UE either monitors PDCCH for dynamic scheduling from the target cell upon LTM cell switch, or the UE selects the configured grant occasion associated with the beam indicated in the cell switch command.

[0042] The following principles apply to LTM:

[0043] The UE doesn't update its security key in LTM.

[0044] Subsequent LTM is supported.

[0045] The LTM supports both intra-gNB-DU and intra-gNB-CU inter-gNB-DU mobility. LTM also supports inter-frequency mobility, including mobility to inter-frequency cell that is not a current serving cell. The following scenarios are supported:

[0046] PCell change in non-CA scenario,

[0047] PCell change in CA scenario,

[0048] Dual connectivity scenario, at least for the PSCell change without MN involvement case, i.e. intra-SN PSCell change.

[0049] Cell switch command is conveyed in a MAC CE, which contains the necessary information to perform the LTM cell switch.

[0050] V 18.0.0 of TS 38.331, 38.321, 38.306, 37.340 etc. and 3gpp CR R2-2401813 and 3gpp document R2-2403842 are considered as background for the present disclosure.

[0051] Fig. 1 is a block diagram that illustrates a schematic of a UE (102) implemented to carry out the disclosed subject matter according to an embodiment as disclosed herein. Examples of the UE (102) can include, but are not limited to, Consumer Electronics (such as Mobile Phones and Smartphones), Tablets, Wearable Devices, Computing Devices (such as Laptops, Notebooks, Desktops, Workstations, etc.), IoT Devices, Automotive Systems (such as connected cars, Autonomous Vehicles, Vehicle-to-Everything (V2X) communication devices, etc.), Enterprise Devices such as robotics, Specialized Equipment (such as Medical Devices, Public Safety Devices, etc.), Media Devices (such as Gaming Consoles, Streaming Devices, etc.).

[0052] In an embodiment, in Fig. 1, the UE (102) includes a first processor (104), a first memory (106), a first I / O interface (108), and a LTM recovery controller (110) coupled to the first processor (104) and the first memory (106). The components are explained in further detail below.

[0053] The first processor (104) communicates with the first memory (106), the first I / O interface (108), and the LTM recovery controller (110). The first processor (104) is configured to execute instructions stored in the first memory (106) and to perform various processes. The first processor (104) includes one or a plurality of processors, is a general-purpose processor such as a central processing unit (CPU), an application processor (AP), or the like, a graphics-only processing unit such as a graphics processing unit (GPU), a visual processing unit (VPU), and / or an Artificial Intelligence (AI) dedicated processor such as a neural processing unit (NPU).

[0054] The first memory (106) includes storage locations to be addressable through the first processor (104). The first memory (106) includes information of a network apparatus. The first memory (106) is not limited to a volatile memory and / or a non-volatile memory. Further, the first memory (106) includes a plurality of computer-readable storage media. The first memory (106) includes non-volatile storage elements. For example, non-volatile storage elements includes magnetic hard disks, optical disks, floppy disks, flash memories, or forms of electrically programmable memories (EPROM) or electrically erasable and programmable (EEPROM) memories.

[0055] The first I / O interface (108) transmits the information between the first memory (106) and external peripheral devices. The peripheral devices are the input-output devices associated with the UE (102). Further, the LTM recovery controller (110) communicates with the first I / O interface (108) and the first memory (106). The LTM recovery controller (110) is coupled to the first memory (106) and the first processor (104). This coupling allows for efficient data transfer and communication between the components, ensuring that the LTM recovery controller (110) handle capability reporting for LTM measurements. The LTM recovery controller (110) is an innovative integrated circuit that is implemented in the UE (102). In an embodiment, the structure of such innovative integrated circuit include a multi-core architecture that enables handling of a capability reporting for LTM measurements in a communication system. Each core is optimized for specific tasks, such as determining a support of LTM recovery and generating a capability information message based on the support of LTM recovery determined. The innovative integrated circuit for the handling of a capability reporting for LTM measurements in the communication system is made of a combination of analog and digital components designed to enhance the LTM measurements capability reporting performance. The analog components include a low-noise amplifier and a high-precision analog-to-digital converter to ensure accurate signal processing. The digital components consist of a microcontroller unit (MCU) and a digital signal processor (DSP) that work in tandem to dynamically handle the capability reporting for LTM measurements in the communication system.

[0056] In an embodiment, the LTM recovery controller (110) receives a capability enquiry message from a network apparatus. The capability enquiry message is a message requesting for information regarding the capabilities and status of the UE (102). The capability enquiry message can include details about the operational parameters of the UE (102), supported protocols, and any specific features that are relevant for network management and optimization. In NR, capability enquiry message can be RRC UECapabilityEnquiry message.

[0057] In an embodiment, the LTM recovery controller (110) determines whether the UE (102) supports a LTM recovery upon receiving the capability enquiry message. The LTM recovery support is determines for at least one of an intra-frequency LTM for a MCG with a RACH and information about a L1- RSRP measurement based on a CSI-RS. The RACH is used by the UE (102) to initiate communication with the network apparatus when it does not have an existing connection. The RACH is essential for initial access, handovers, and re-establishing lost connections. The L1-RSRP is a measurement that indicates a power level of a reference signal received by the UE (102). The power level corresponds to an average power received from a resource element carrying the reference signal. The CSI-RS refers to a downlink reference signal that enables the UE (102) to determine the channel conditions during the LTM recovery based on a channel quality indicator.

[0058] In an embodiment, the LTM recovery controller (110) generates a capability information message upon determining the LTM recovery support. The capability information message is determined by adding at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS. Further, the LTM recovery controller (110) transmits the capability information message to the network apparatus.

[0059] Fig. 2 is a block diagram that illustrates a schematic of a network apparatus (202) implemented to carry out the disclosed subject matter according to an embodiment as disclosed herein. As shown, the network apparatus (202) includes a second processor (204), a second memory (206), a second I / O interface (208), and a network LTM recovery controller (210) coupled to the second processor (204) and the second memory (206).

[0060] The network apparatus (202) includes various hardware and software components that facilitate communication between user equipment and network infrastructure. Examples of the network apparatus (2-2) can include, but is not limited to Base Stations (such as macro cells, small cells, femtocells, picocells) for wireless communication, Antennas and RF Units (e.g., MIMO, beamforming) to enhance signal coverage and data throughput, Core Network Equipment (e.g., MMEs, S-GWs, P-GWs in 4G; AMFs, UPFs in 5G) for data routing, mobility, and session control, Network Function Virtualization (NFV) and Software-Defined Networking (SDN) for dynamic resource allocation and scalability, Edge Computing Nodes (e.g., MEC servers) for low-latency processing,　 Backhaul and Transport Equipment (e.g., fiber-optic links, microwave relays, Ethernet switches) to connect base stations to the core network, Network Management Systems (NMS) and Operation Support Systems (OSS) for network configuration, fault management, and optimization, Radio Network Controllers (RNCs) in 3G, Distributed Units (DUs), and Centralized Units (CUs) in 5G, Network Slicing Components for virtualized resource allocation, Security elements (e.g., Firewalls, IDS, AAA Servers) for secure communication.

[0061] The network LTM recovery controller (210) is coupled to the second memory (206) and the second processor (204). This coupling allows for efficient data transfer and communication between the components, ensuring that the network LTM recovery controller (210) handle capability reporting for LTM measurements. The network LTM recovery controller (210) is an innovative integrated circuit that is implemented in the network apparatus (202). In an embodiment, the structure of such innovative integrated circuit include a multi-core architecture that enables handling of a capability reporting for LTM measurements in a communication system. Each core is optimized for specific tasks, such as determining a support of LTM recovery and generating a capability information message based on the support of LTM recovery determined. The innovative integrated circuit for the handling of a capability reporting for LTM measurements in the communication system is made of a combination of analog and digital components designed to enhance the LTM measurements capability reporting performance. The analog components include a low-noise amplifier and a high-precision analog-to-digital converter to ensure accurate signal processing. The digital components consist of a microcontroller unit (MCU) and a digital signal processor (DSP) that work in tandem to dynamically handle the capability reporting for LTM measurements in the communication system.

[0062] In an embodiment, the network LTM recovery controller (210) transmits a capability enquiry message to the UE (102). The capability enquiry message is a message requesting for information regarding the capabilities and status of the UE (102). In NR, capability enquiry message can be RRC UECapabilityEnquiry message. The capability enquiry message can include details about the operational parameters of the UE (102), supported protocols, and any specific features that are relevant for network management and optimization.

[0063] In an embodiment, the network LTM recovery controller (210) receives a capability information message from the UE (102) upon successful transmission of the capability enquiry message. In NR, capability information message can be RRC UECapabilityInformation message. The capability information message includes at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS.

[0064] In an embodiment, the network LTM recovery controller (210) configures measurements for performing LTM measurements and a configuration for LTM based recovery. This configuration is performed based on at least one of an indication for a LTM recovery for an intra-frequency LTM for the MCG with the RACH, and / or information about the L1-RSRP measurement based on the CSI-RS.

[0065] Fig. 3 is a sequence diagram that illustrates UE capability reporting for LTM according to an embodiment as disclosed herein. As shown in the sequence diagram, the UE (102) is in communication with the network apparatus (202). Each step is explained below.

[0066] At step S1, the UE (102) receives a UE capability enquiry from the network apparatus (202). The capability enquiry message is a message requesting for information regarding the capabilities and status of the UE (102). At step S2, the UE (102) sets the contents of UE capability for LTM according to the embodiments. For instance, the contents can be set based on an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS.

[0067] At step S3, the UE (102) transmits a capability information message to the network apparatus (202). The capability information message includes at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS. At step S4, the network apparatus (202) configures measurements for performing LTM measurements and a configuration for LTM based recovery. This configuration is performed based on at least one of an indication for a LTM recovery for an intra-frequency LTM for the MCG with the RACH, and / or information about the L1-RSRP measurement based on the CSI-RS.

[0068] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements without the gap (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM) in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0069] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements without the gap (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0070] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements without the gap (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM) for measurements configured by MN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0071] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements without the gap (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM) for measurements configured by SN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0072] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements without the gap (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM) for measurements configured by MN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity) and also for the measurements configured by MCG in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0073] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements without the gaps (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM) for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0074] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements with the gap (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM) in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0075] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements with the gap (i.e. the UE (102) informs UE informs UE's Capability of SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0076] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements with the gap (the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM) for measurements configured by MN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0077] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements with the gap (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM) for measurements configured by SN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0078] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements with the gap (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM) for measurements configured by MN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity) and also for the measurements configured by MCG in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0079] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the inter-frequency LTM measurements with the gaps (i.e. the UE (102) informs UE's Capability of SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM) for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0080] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the intra-frequency LTM measurements without the gap in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0081] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the intra-frequency LTM measurements without the gap in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0082] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the intra-frequency LTM measurements without the gap for measurements configured by MN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0083] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the intra-frequency LTM measurements without the gap for measurements configured by SN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0084] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the intra-frequency LTM measurements without the gap for measurements configured by MN (MCG) in dual connectivity (such as NR-DC, NR-NR Dual Connectivity) and also for the measurements configured by MCG in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0085] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, whether the UE (102) is capable of performing the intra-frequency LTM measurements without the gaps for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0086] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for intra- and inter-frequency without measurement gaps L1-RSRP measurement for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0087] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for intra-frequency and inter-frequency without measurement gaps L1-RSRP measurement for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0088] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for intra- and inter-frequency without measurement gaps L1-RSRP measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0089] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for intra- and inter-frequency without measurement gaps L1-RSRP measurement in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0090] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for intra- and inter-frequency without measurement gaps L1-RSRP measurement in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0091] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for intra- and inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0092] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for intra- and inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0093] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for intra- and inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0094] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for inter-frequency without measurement gaps L1-RSRP measurement for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0095] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for inter-frequency without measurement gaps L1-RSRP measurement for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0096] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for inter-frequency without measurement gaps L1-RSRP measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0097] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for inter-frequency without measurement gaps L1-RSRP measurement in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0098] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for inter-frequency without measurement gaps L1-RSRP measurement in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0099] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0100] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0101] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of frequency layers the UE (102) can measure for inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0102] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps L1-RSRP measurement for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0103] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps L1-RSRP measurement for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0104] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps L1-RSRP measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0105] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbor cells the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps L1-RSRP measurement in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0106] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbor cells the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps L1-RSRP measurement in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0107] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbor cells the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0108] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0109] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0110] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency without measurement gaps L1-RSRP measurement for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0111] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency without measurement gaps L1-RSRP measurement for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0112] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency without measurement gaps L1-RSRP measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0113] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency without measurement gaps L1-RSRP measurement in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0114] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency without measurement gaps L1-RSRP measurement in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0115] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbour cells the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0116] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbor cells the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0117] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of neighbor cells the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency without measurement gaps L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0118] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total cells of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0119] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total cells of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0120] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total cells of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0121] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total cells of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0122] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total cells of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0123] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total cells of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0124] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total cells of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0125] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total cells of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency frequency without measurement gaps for L1 measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0126] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources for L1-RSRP measurement that the UE (102) can measure within a slot across candidate cells for intra- and inter-frequency without gap L1-RSRP measurement for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0127] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources for L1-RSRP measurement that the UE (102) can measure within a slot across candidate cells for intra- and inter-frequency without gap L1-RSRP measurement for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0128] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources for L1-RSRP measurement that the UE (102) can measure within a slot across candidate cells for intra- and inter-frequency without gap L1-RSRP measurement for L1 measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0129] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources for L1-RSRP measurement that the UE (102) can measure within a slot across candidate cells for intra- and inter-frequency without gap L1-RSRP measurement in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0130] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources for L1-RSRP measurement that the UE (102) can measure within a slot across candidate cells for intra- and inter-frequency without gap L1-RSRP measurement in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0131] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources for L1-RSRP measurement that the UE (102) can measure within a slot across candidate cells for intra- and inter-frequency without gap L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0132] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources for L1-RSRP measurement that the UE (102) can measure within a slot across candidate cells for intra- and inter-frequency without gap L1-RSRP measurement for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0133] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources for L1-RSRP measurement that the UE (102) can measure within a slot across candidate cells for intra- and inter-frequency without gap L1-RSRP measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0134] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0135] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0136] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps for L1 measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0137] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0138] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0139] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0140] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0141] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for intra-frequency or inter-frequency without measurement gaps for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0142] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency with measurement gaps for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0143] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency with measurement gaps for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0144] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency with measurement gaps for L1 measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0145] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency with measurement gaps in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0146] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency with measurement gaps in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0147] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency with measurement gaps for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0148] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency with measurement gaps for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0149] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of SSB resources the UE (102) can measure for L1-RSRP per frequency layer for inter-frequency with measurement gaps for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0150] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total SSB resources of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for MCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0151] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total SSB resources of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for SCG. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0152] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total SSB resources of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for L1 measurement for MCG and SCG together. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0153] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total SSB resources of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0154] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total SSB resources of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0155] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total SSB resources of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0156] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total SSB resources of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for the measurements configured by SN in dual connectivity (such as NR-NR DC). In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0157] In an embodiment, the UE (102) informs the network apparatus (202), such as the gNB, the maximum number of total SSB resources of serving cells and neighboring cells across all frequency layers of intra-frequency and inter-frequency without measurement gaps for L1 measurement for the measurements configured by MN in dual connectivity (such as NR-NR DC) and in single connectivity. In an embodiment, this can be reported as a per-UE capability. In an embodiment, this can be reported as a per-BC (i.e. per Band Combination) capability.

[0158] In an embodiment, the UE (102) supporting ltm-Recovery-r18 also supports ltm-MCG-r18.

[0159] In an embodiment, the UE (102), which indicates that it supports the recovery procedure for MCG LTM execution when the selected cell in RRC re-establishment procedure is a LTM candidate as specified in TS 38.331 also supports LTM for MCG with RACH at least with the NR-DC not configured.

[0160] The ltm-Recovery-r18 Indicates support of recovery procedure for MCG LTM execution when the selected cell in RRC re-establishment procedure is a LTM candidate as specified in TS 38.331 [9]. The UE (102) indicating support for this feature shall also indicate support of ltm-MCG-r18.

[0161] In an embodiment, the UE (102) that supports SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM also supports the parameter interFrequencyMeas-NoGap-r16.

[0162] In an embodiment, the UE (102) indicates whether it supports CSI-RS based inter-frequency L1-RSRP measurements.

[0163] In an embodiment, the UE (102) indicates whether it supports CSI-RS based intra-frequency L1-RSRP measurements.

[0164] In an embodiment, the UE (102) indicates the maximum number of frequencies it supports CSI-RS based inter-frequency L1-RSRP inter-frequency measurements.

[0165] In an embodiment, the UE (102) indicates the maximum number of cells it supports CSI-RS based inter-frequency L1-RSRP measurements and intra-frequency measurements. This may be indicated separately, as a separate capability information indicating the maximum number of cells it supports for CSI-RS based inter-frequency L1-RSRP measurements and another capability information indicating the maximum number of cells it supports for CSI-RS based intra-frequency L1-RSRP measurements.In an embodiment, the UE (102) that supports MCG LTM, ltm-MCG-r18 for inter-frequency LTM also indicates the support for the capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM or the Capability of SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM.

[0166] In an embodiment, according to TS 38.306, ltm-MCG-r18 Indicates whether the UE (102) supports LTM for MCG with RACH as defined in TS 38.331 [9] and TS 38.321 [8] without NR-DC configured (including the scenario where NR-DC configuration is released as part of LTM execution when LTM cell switch command MAC CE is received). The UE (102) may support LTM for MCG with RACH without NR-DC configured for intra-frequency and / or inter-frequency. The UE (102) supporting LTM for MCG with RACH without NR-DC configured for inter-frequency always supports LTM for MCG with RACH without NR-DC configured for intra-frequency. The UE (102) supporting this feature shall also indicate support intra-frequency L1 measurement and report (FG45-1).

[0167] The UE (102) supporting inter-frequency LTM cell switch shall also indicate support for inter-frequency L1 measurement and report (FG45-1a) and shall also indicate support of either SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM or SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM.

[0168] The UE (102) supporting this feature shall also indicate support for TCI state indication (FG45-3 and FG45-4).

[0169] In an embodiment, the UE (102) that supports SCG LTM, ltm-SCG-r18 for inter-frequency LTM also indicates the support for the capability of SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM or the Capability of SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM.

[0170] In an embodiment, according to TS 38.306, ltm-SCG-r18 Indicates whether the UE (102) supports LTM for SCG with RACH as defined in TS 38.331 [9] and TS 38.321 [8].

[0171] The UE (102) supporting this feature shall also indicate support intra-frequency L1 measurement and report (FG45-1).

[0172] The UE (102) supporting inter-frequency LTM cell switch for SCG shall also indicate support for inter-frequency L1 measurement and report (FG45-1a) ) and shall also indicate support of either SSB based inter-frequency L1-RSRP measurements with measurement gaps for LTM or SSB based inter-frequency L1-RSRP measurements without measurement gaps (without interruption on serving cell(s)) for LTM.

[0173] The UE (102) supporting this feature shall also indicate support for TCI state indication (FG45-3 and FG45-4).

[0174] In an embodiment, the network apparatus (202) that receives these capabilities configures the measurements for LTM accordingly.

[0175] In an embodiment, the network apparatus (202) that receives these capabilities configures the measurement gaps for LTM measurements accordingly.

[0176] Fig. 4 is a flow diagram that illustrates a method for capability reporting for LTM measurement in a communication system by the UE (102) according to an embodiment as disclosed herein. The method includes steps (402-408). Each step is explained in further detail below.

[0177] At step (402), the UE (102) receives a capability enquiry message from the network apparatus (202). The capability enquiry message is a message requesting for information regarding the capabilities and status of the UE (102). The capability enquiry message can include details about the operational parameters of the UE (102), supported protocols, and any specific features that are relevant for network management and optimization.

[0178] At step (404), the UE (102) determines whether the UE (102) supports a LTM recovery upon receiving the capability enquiry message. The LTM recovery support is determines for at least one of an intra-frequency LTM for a MCG with a RACH and information about a L1- RSRP measurement based on a CSI-RS. The RACH is utilized by the UE (102) to establish communication with the network apparatus (202) when no prior connection exists or for synchronising with the network apparatus (202). It plays a crucial role in initial access, facilitating handovers, and re-establishing connections that have been lost. The L1-RSRP is a metric that reflects the power level of a reference signal received by the UE (102), representing the average power received from a resource element associated with that reference signal. The CSI-RS is a downlink reference signal that allows the UE (102) to assess channel conditions during the LTM recovery, based on a channel quality indicator.

[0179] At step (406), the UE (102) generates a capability information message upon determining the LTM recovery support. The capability information message is determined by adding at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS. At step (408), the UE (102) transmits the capability information message to the network apparatus.

[0180] Fig. 5 is a flow diagram that illustrates a method for capability reporting for LTM measurement in a communication system by the network apparatus (202) according to an embodiment as disclosed herein. The method includes steps (502-506). Each step is explained in further detail below.

[0181] At step (502), the network apparatus (202) transmits a capability enquiry message to the UE (102). The capability enquiry message is a message requesting for information regarding the capabilities and status of the UE (102). The capability enquiry message can include details about the operational parameters of the UE (102), supported protocols, and any specific features that are relevant for network management and optimization.

[0182] At step (504), the network apparatus (202) receives a capability information message from the UE (102) upon successful transmission of the capability enquiry message. The capability information message includes at least one of an indication for a LTM recovery for at least one of an intra-frequency LTM for the MCG with the RACH, and information about the L1-RSRP measurement based on the CSI-RS.

[0183] At step (506), the network apparatus (202) configures measurements for performing LTM measurements and a configuration for LTM based recovery. This configuration is performed based on at least one of an indication for a LTM recovery for an intra-frequency LTM for the MCG with the RACH, and / or information about the L1-RSRP measurement based on the CSI-RS.

[0184] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the scope of the embodiments as described herein.

Claims

1.A method performed by a user equipment (UE) in a wireless communication system, the method comprising:receiving, from a base station, a UE capability enquiry message requesting for capability information of the UE;upon receiving the UE capability enquiry message, setting contents of a UE capability information message; andtransmitting, to the base station, the UE capability information message,wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.2.The method of claim 1, wherein the UE capability information message further includes information indicating that the UE supports a layer-1 (L1) Reference Signal Received Power (RSRP) measurement based on Channel State Information Reference Signal (CSI-RS).3.The method of claim 2, wherein the UE capability information message includes information indicating a maximum number of frequencies for which the UE supports a CSI-RS based inter-frequency L1-RSRP measurement.4.The method of claim 2, wherein the UE capability information message includes information indicating a maximum number of cells for which the UE supports a CSI-RS based intra-frequency L1-RSRP measurement.5.A method performed by a base station in a wireless communication system, the method comprising:transmitting, to a user equipment (UE), a UE capability enquiry message requesting for capability information of the UE; andreceiving, from the UE, a UE capability information message,wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.6.The method of claim 5, wherein the UE capability information message further includes information indicating that the UE supports a layer-1 (L1) Reference Signal Received Power (RSRP) measurement based on Channel State Information Reference Signal (CSI-RS).7.The method of claim 6, wherein the UE capability information message includes information indicating a maximum number of frequencies for which the UE supports a CSI-RS based inter-frequency L1-RSRP measurement.8.The method of claim 6, wherein the UE capability information message includes information indicating a maximum number of cells for which the UE supports a CSI-RS based intra-frequency L1-RSRP measurement.9.A user equipment (UE) comprising:a transceiver; anda processor coupled with the transceiver and configured to:receive, from a base station via the transceiver, a UE capability enquiry message requesting for capability information of the UE,upon receiving the UE capability enquiry message, set contents of a UE capability information message, andtransmit, to the base station via the transceiver, the UE capability information message,wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.10.The method of claim 9, wherein the UE capability information message further includes information indicating that the UE supports a layer-1 (L1) Reference Signal Received Power (RSRP) measurement based on Channel State Information Reference Signal (CSI-RS).11.The method of claim 10, wherein the UE capability information message includes information indicating a maximum number of frequencies for which the UE supports a CSI-RS based inter-frequency L1-RSRP measurement.12.The method of claim 10, wherein the UE capability information message includes information indicating a maximum number of cells for which the UE supports a CSI-RS based intra-frequency L1-RSRP measurement.13.A base station comprising:a transceiver; anda processor coupled with the transceiver and configured to:transmit, to a user equipment (UE) via the transceiver, a UE capability enquiry message requesting for capability information of the UE, andreceive, from the UE via the transceiver, a UE capability information message,wherein in case that the UE capability information message includes information indicating that the UE supports a recovery procedure for master cell group (MCG) lower layer triggered mobility (LTM) execution when a selected cell in radio resource control (RRC) re-establishment procedure is an LTM candidate, the UE capability information message further includes information indicating that the UE supports an LTM for MCG with Random Access Channel (RACH) without New Radio Dual Connectivity (NR-DC) configured.14.The method of claim 13, wherein the UE capability information message further includes information indicating that the UE supports a layer-1 (L1) Reference Signal Received Power (RSRP) measurement based on Channel State Information Reference Signal (CSI-RS).15.The method of claim 14,wherein the UE capability information message includes information indicating a maximum number of frequencies for which the UE supports a CSI-RS based inter-frequency L1-RSRP measurement, andwherein the UE capability information message includes information indicating a maximum number of cells for which the UE supports a CSI-RS based intra-frequency L1-RSRP measurement.

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