Apparatus and method for cell mismatch handling in idle / inactive state operation of network control relay in next generation communication system

Abstract

The present disclosure relates to a 5th-Generation (5G) or 6th-Generation (6G) communication system capable of supporting higher data rates, and discloses a method and apparatus for enabling a mobile terminal (MT) of a network-controlled repeater (NCR) to perform repeater control in idle / inactive cases. The method includes: performing, by a forwarding (Fwd) (NCR-Fwd) of an NCR node, a signal forwarding between a terminal and a base station based on first control information received from the base station; receiving, by a mobile terminal (MT) (NCR-MT) of the NCR node, a radio resource control (RRC) release message from the base station; performing, by the NCR-MT, cell reselection in an RRC inactive state based on the RRC release message including information on a pause configuration; and in the case that the NCR-MT reselects a cell other than the last serving cell of the base station, the NCR-MT instructs the NCR-Fwd to stop the signal forwarding.

Description

Technical Field

[0001] The present disclosure relates to a Network Controlled Repeater (NCR) in a mobile communication system, and more particularly, to a technology for a Mobile Terminal (MT) for the NCR to perform relay control in an idle / inactive situation in the mobile communication system. Background Art

[0002] Fifth-generation (5G) mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and is achievable not only in frequency bands below 6 gigahertz (GHz), such as 3.5 GHz, but also in ultra-high frequency bands (above 6 GHz), known as millimeter waves (mmWave), such as 28 GHz or 39 GHz. Furthermore, sixth-generation (6G) mobile communication technology, known as a "beyond 5G" system, is being considered for implementation in the terahertz (THz) frequency band (e.g., the 95 GHz to 3 THz band), aiming to achieve transmission speeds 50 times faster than 5G mobile communication technology and ultra-low latency reduced to 1 / 10th that of 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, in order to meet the service support and performance requirements of enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC), and massive machine-type communications (mMTC), standardization has been carried out on the following: beamforming for alleviating path loss of radio waves and increasing their propagation range in the millimeter wave band, massive multiple-input multiple-output (MIMO), support for various parameter sets for efficient utilization of ultra-high frequency resources (for example, operating multiple subcarrier spacings), dynamic operation on time slot formats, initial access schemes supporting multi-beam transmission and broadband, definition and operation of bandwidth parts (BWPs), new channel coding schemes (such as low-density parity-check (LDPC) codes for large-capacity data transmission and polar codes for reliable transmission of control information), layer 2 (L2) pre-processing, and network slicing for providing dedicated networks dedicated to specific services.

[0004] Considering the services that 5G mobile communication technology is initially intended to support, discussions are underway to improve 5G mobile communication technology and enhance its performance, and physical layer standardization is underway for technologies such as: Vehicle-to-Everything (V2X), which aims to help autonomous vehicles make driving decisions based on their own position and status information transmitted by the vehicle and increase user convenience; New Radio Unlicensed (NR-U) for system operations that meets various regulatory requirements in unlicensed frequency bands; low power consumption schemes for NR terminals (UE energy saving); Non-Terrestrial Network (NTN) as direct terminal-satellite communication to ensure coverage in areas where communication with terrestrial networks is impossible; and positioning.

[0005] In addition, standardization of radio interface architecture / protocols for technologies such as the following is underway: Industrial Internet of Things (IIoT) for supporting new services through collaboration and integration with other industries, Integrated Access and Backhaul (IAB) which provides a node for network service area extension by integrating and supporting wireless backhaul links and access links, mobility enhancement (including conditional handover and Dual Active Protocol Stack (DAPS) handover), 2-step random access to simplify the random access procedure (2-step RACH for NR); and standardization of the following system architecture / services is also underway: 5G baseline architecture (e.g., service-based architecture, service-based interface) for integrating network function virtualization (NFV) and software-defined networking (SDN) technologies, and mobile edge computing (MEC) in which terminals receive services based on their locations.

[0006] When 5G mobile communication systems are commercialized, a growing number of connected devices will be connected to the communication network. Consequently, it is expected that the functionality and performance of 5G mobile communication systems and the integrated operation of connected devices will need to be enhanced. To this end, new research will be conducted on improving 5G performance and reducing complexity through the use of extended reality (XR), supporting artificial intelligence (AI) services, virtual services, and drone communications to effectively support augmented reality (AR), virtual reality (VR), mixed reality (MR), AI, and machine learning (ML).

[0007] Such advancements in 5G mobile communication systems will serve as the foundation for developing technologies such as new waveforms for ensuring coverage of the THz band for 6G mobile communication technology, full-dimensional MIMO (FD-MIMO), multi-antenna transmission such as array antennas or massive antennas, metamaterial-based lenses and antennas for improving coverage of THz band signals, high-dimensional spatial multiplexing using orbital angular momentum (OAM), reconfigurable smart surface (RIS) technology, full-duplex technology for improving frequency efficiency and system networks for 6G mobile communication technology, satellites, AI-based communications that leverage AI from the design stage and internalize end-to-end AI support functions for system optimization, and next-generation distributed computing that enables services whose complexity exceeds the computing capabilities of terminals by utilizing ultra-high-performance communication and computing resources.

[0008] As mobile communication systems advance and offer a wide range of services, a method for efficiently providing these services is needed. For example, to provide these services, NCRs can be used, performing both forwarding and mobile transmission (MT) functions. The forwarding (FWD) function receives, amplifies, and forwards signals, while the MT function receives beam-related configurations and transmits them to the FWD function. Furthermore, as a terminal function, the MT function can perform operations such as cell reselection. Summary of the Invention

[0009] Technical issues

[0010] When a MT in such an NCR performs cell reselection, the cell intended for signal amplification and the reselected cell may differ, resulting in inefficient resource usage in the communication system. Therefore, a method and apparatus for resolving the mismatch between the target cell and the reselected cell in a mobile communication system is needed in the art.

[0011] Solution to the problem

[0012] According to one aspect of the present disclosure, a method performed by a network controlled repeater (NCR) node in a communication system includes: performing signal forwarding between a terminal and the base station by a forwarding (Fwd) (NCR-Fwd) of the NCR node based on first control information received from the base station; receiving a radio resource control (RRC) release message from the base station by a mobile terminal (MT) (NCR-MT) of the NCR node; performing cell reselection in an RRC inactive state based on information about a suspension configuration included in the RRC release message; and instructing the NCR-MT to stop the signal forwarding in a case where the NCR-MT reselects a cell other than the last serving cell of the base station.

[0013] According to an example of the present disclosure, an NCR node in a communication system includes a transceiver and a controller, wherein the controller is configured to: control the Fwd (NCR-Fwd) of the NCR node to perform signal forwarding between a terminal and the base station based on first control information received from the base station; control the NCR-MT to receive an RRC release message from the base station; control the NCR-MT to perform cell reselection in an RRC inactive state based on the RRC release message including information about a suspension configuration; and, in a case where the NCR-MT reselects a cell other than the last serving cell of the base station, control the NCR-MT to instruct the NCR-Fwd to stop the signal forwarding.

[0014] Advantageous Effects of the Invention

[0015] The present disclosure is to address at least the above-mentioned problems and / or disadvantages and to provide at least the advantages described below.

[0016] Therefore, an aspect of the present disclosure is to provide a method and apparatus by which two cells can be matched even if there is a difference between a cell to which a network-controlled relay applies amplification and a cell selected due to cell reselection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0018] Figure 1 The overall architecture of a Long Term Evolution (LTE) system to which the present disclosure is applied is shown;

[0019] Figure 2 The overall structure of the radio protocol in the LTE system to which the present disclosure is applied is shown;

[0020] Figure 3 shows the architecture of a next generation mobile communication system according to an embodiment;

[0021] Figure 4 shows the structure of a radio protocol in a next generation mobile communication system according to an embodiment;

[0022] Figure 5 shows the internal structure of a UE according to an embodiment;

[0023] Figure 6 shows the structure of an NR base station (BS) according to an embodiment;

[0024] Figure 7 shows a situation when the MT is not allowed to perform cell reselection according to an embodiment;

[0025] Figure 8 shows the situation when the MT is allowed to perform cell reselection but FWD is turned off according to an embodiment;

[0026] Figure 9 shows the situation when the MT is allowed to perform cell reselection but the redirection is directed to the original cell according to an embodiment; and

[0027] Figure 10 A case is shown when FWD performs amplification / forwarding for a plurality of cells according to an embodiment. DETAILED DESCRIPTION

[0028] The embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. For the sake of clarity and conciseness, descriptions of well-known functions and structures incorporated herein may be omitted. The terms described below are defined with reference to their functions in the present disclosure and may vary depending on the intentions or habits of the user or operator. Therefore, their meanings should be determined based on the overall content of this specification.

[0029] For ease of description, the terms used in the following description to identify access nodes and indicate network entities, messages, interfaces between network entities, and various identification information are provided as examples. Therefore, the present disclosure is not limited by the terms described later, and other terms referring to objects with equivalent technical meanings may be used.

[0030] In this article, the elements included in the present disclosure are expressed in singular or plural form according to the embodiment. However, for ease of description, singular or plural expression is appropriately selected according to the current situation, and the present disclosure is not limited to a single element or multiple elements. Those elements described in plural form can also be configured as a single element, and those elements described in singular form can be configured as multiple elements.

[0031] In the following description, a base station (BS), acting as the master agent for allocating resources to terminals, may be at least one of a Node B, eNode B, gNode B, radio access unit, BS controller, or a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, downlink (DL) refers to the wireless transmission path through which a BS transmits signals to a terminal, and uplink (UL) refers to the wireless transmission path through which a terminal transmits signals to a BS. This disclosure may be described using LTE or LTE-A systems as examples, but it can also be applied to other communication systems with similar technical backgrounds or channel configurations, such as the fifth-generation mobile communication technology (5G, New Radio, NR) developed after LTE-A. 5G includes existing LTE, LTE-A, and other similar services. This disclosure is applicable to other communication systems without significant modifications that depart from the scope of this disclosure.

[0032] To facilitate the following description, this disclosure uses terms and names defined in the 5GS and NR standards, which are currently existing communication standards defined by the Third Generation Partnership Project (3GPP). However, this disclosure is not limited to these terms and names and can be applied to wireless communication networks that conform to other standards. For example, this disclosure can be applied to 3GPP 5GS / NR (fifth-generation mobile communication standards).

[0033] Figure 1 The overall architecture of the LTE system to which the present disclosure is applied is shown.

[0034] exist Figure 1In the example, an evolved Node B (ENB) or Node B 1-05, 1-10, 1-15, or 1-20, a mobility management entity (MME) 1-25, and a serving gateway (S-GW) 1-30 are provided. A UE (or terminal) 1-35 can connect to an external network through the ENB 1-05, 1-10, 1-15, or 1-20 and the S-GW 1-30.

[0035] exist Figure 1 In the LTE system, ENBs 1-05 to 1-20 correspond to existing Node Bs in the Universal Mobile Telecommunications System (UMTS). ENBs connect to UEs 1-35 via radio channels but perform more complex functions than existing Node Bs. In LTE systems, all user services, including real-time services such as Voice over Internet Protocol (VoIP), can be served via shared channels. Therefore, a mechanism is required to perform scheduling based on collected information about UE buffers, available transmit power, and channel status, and ENBs 1-05 to 1-20 may be responsible for this. In a typical scenario, a single ENB may control multiple cells. To achieve a data rate of, for example, 100 megabits per second (Mbps) in a bandwidth of, for example, 20 MHz, LTE systems may use Orthogonal Frequency Division Multiplexing (OFDM) as a radio access technology. LTE systems may apply Adaptive Modulation and Coding (AMC) to determine the modulation scheme and channel coding rate based on the UE's channel conditions. The S-GW 1-30 provides data bearers and can create and remove data bearers under the control of the MME 1-25. The MME controls various control functions of the UE, including a mobility management function, and can be connected to multiple ENBs.

[0036] Figure 2 The structure of a radio protocol in an existing LTE system to which the present disclosure is applied is shown.

[0037] refer to Figure 2In the UE or ENB, the radio protocols of the LTE system can be composed of the Packet Data Convergence Protocol (PDCP) 2-05 and 2-40, the Radio Link Control (RLC) 2-10 and 2-35, and the Medium Access Control (MAC) 2-15 and 2-30. PDCP can perform IP header compression and decompression. The main functions of PDCP can be summarized as: Robust Header Compression (ROHC); user data transmission; in-sequence delivery of upper layer packet data units (PDUs) during Packet Data Convergence Protocol (PDCP) re-establishment for RLC Acknowledged Mode (AM); reordering for split bearers in DC (supports RLC AM only): PDCP PDU routing for transmission and PDCP PDU reordering for reception; duplicate detection of lower layer service data units (SDUs) during PDCP re-establishment for RLC AM; retransmission of PDCP SDUs upon handover for RLC AM and retransmission of PDCP PDUs during PDCP data recovery for split bearers in DC; ciphering and deciphering; and timer-based SDU discard in the UL.

[0038] Radio Link Control (RLC) 2-10 and 2-35 can reconfigure PDCP PDUs to the appropriate size and perform ARQ operations. The main functions of RLC can be summarized as: data transmission of upper layer PDUs, error correction through automatic repeat request (ARQ) (for AM data transmission), concatenation, segmentation, and reassembly of RLC SDUs (for negative acknowledgement mode (UM) and AM data transmission), resegmentation of RLC data PDUs (for AM data transmission), reordering of RLC data PDUs (for UM and AM data transmission), duplicate detection (for UM and AM data transmission), protocol error detection (for AM data transmission), RLC SDU discard (for UM and AM data transmission), and RLC re-establishment.

[0039] MAC 2-15 and 2-30 can be connected to multiple RLC entities configured in the UE and can multiplex RLC PDUs into MAC PDUs and demultiplex MAC PDUs into RLC PDUs. The main functions of MAC may be: mapping between logical channels and transport channels, multiplexing MAC SDUs belonging to one or different logical channels into transport blocks (TBs) delivered to the physical layer on the transport channel / demultiplexing MAC SDUs belonging to one or different logical channels from transport blocks (TBs) delivered from the physical layer on the transport channel, scheduling information reporting, hybrid automatic repeat request (HARQ) error correction, priority handling between logical channels of one UE, priority handling between UEs through dynamic scheduling, Multimedia Broadcast Service (MBMS) identification, transport format selection and padding.

[0040] The physical (PHY) layers 2-20 and 2-25 may convert higher layer data into OFDM symbols with the help of channel coding and modulation and transmit the OFDM symbols through a radio channel, or may demodulate OFDM symbols received through a radio channel, perform channel decoding, and convert the result to a higher layer.

[0041] Figure 3 The architecture of the next generation mobile communication system to which the present disclosure is applied is shown.

[0042] exist Figure 3 In the NR or 5G system, the radio access network may consist of a new radio node B (NR gNB or NR BS) 3-10 and a new radio core network (NR CN) 3-05. NR UEs 3-15 may connect to external networks through the NR gNB 3-10 and NR CN 3-05.

[0043] exist Figure 3 In this system, the NR gNB 3-10 can correspond to the eNB in ​​the existing LTE system. The NR gNB can connect to the NR UE 3-15 via a radio channel and can provide better service than the existing Node B. In next-generation mobile communication systems, all user traffic can be served via shared channels. Therefore, an entity is required to perform scheduling by collecting status information (such as buffer status, available transmission power, and channel status of each UE), and the NR NB 3-10 can be responsible for this scheduling. One NR gNB can control multiple cells. In next-generation mobile communication systems, to achieve ultra-high-speed data transmission compared to standard LTE, bandwidths exceeding the typical maximum bandwidth can be utilized. Beamforming technology can also be combined with OFDM, the radio access technology. Adaptive modulation and coding (AMC) schemes can be applied to determine the modulation scheme and channel coding rate to match the UE's channel conditions. The NR CN 3-05 can perform functions such as mobility support, bearer configuration, and quality of service (QoS) configuration. The NR CN not only controls mobility management but also various UE control functions and can connect to multiple base stations. In addition, the next generation mobile communication system can cooperate with the LTE system, and the NR CN can be connected to the MME 3-25 through a network interface. The MME can be connected to the eNB 3-30 which is the LTE BS.

[0044] Figure 4 The structure of a radio protocol in a next-generation mobile communication system to which the present disclosure is applied is shown.

[0045] refer to Figure 4, in the UE or NR gNB, the radio protocol of the next generation mobile communication system consists of NR Service Data Adaptation Protocol (SDAP) 4-01 and 4-45, NR PDCP 4-05 and 4-40, NR RLC 4-10 and 4-35, NR MAC 4-15 and 4-30, and NR PHY 4-20 and 4-25.

[0046] The main functions of NR SDAP 4-01 and 4-45 may include the transmission of user plane data, mapping between quality of service (QoS) flows and DRBs for both DL and UL, marking of QoS flow IDs in both DL and UL packets, and reflective QoS flow to DRB mapping for UL SDAP PDUs.

[0047] Regarding the SDAP entity, for each PDCP entity, bearer, or logical channel, the UE can be configured with a header or function of whether to use the SDAP entity through a radio resource control (RRC) message. If the SDAP header is configured, the UE can use the SDAP header's non-access stratum (NAS) reflective QoS 1-bit indication and access stratum (AS) reflective QoS 1-bit indication to instruct the UE to update or reconfigure the mapping information between QoS flows and data bearers for UL and DL. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority and scheduling information to support smooth service.

[0048] The main functions of NR PDCP 4-05 and 4-40 may include ROHC, transmission of user data, in-sequence delivery of upper layer PDUs, out-of-sequence delivery of upper layer PDUs, PDCP PDU reordering for reception, duplicate detection of lower layer SDUs, retransmission of PDCP SDUs, ciphering and deciphering, and timer-based SDU discard in the UL.

[0049] In the above description, the reordering function of the NR PDCP entity may refer to reordering PDCP PDUs received from lower layers in sequence based on the PDCP sequence number (SN). The reordering function of the NR PDCP entity may include delivering data to upper layers in a reordered sequence, delivering data directly without regard to the sequence, recording lost PDCP PDUs through reordering, reporting the status of lost PDCP PDUs to the transmitting side, or requesting retransmission of lost PDCP PDUs.

[0050] The main functions of NR RLC 4-10 and 4-35 may include transmission of upper layer PDUs; in-sequence delivery of upper layer PDUs; out-of-sequence delivery of upper layer PDUs; error correction through ARQ; concatenation, segmentation and reassembly of RLC SDUs; resegmentation of RLC data PDUs; reordering of RLC data PDUs; duplicate detection; protocol error detection; RLC SDU discard and RLC re-establishment.

[0051] In the above description, in-sequence delivery of the NR RLC entity may refer to delivering RLC SDUs received from a lower layer to an upper layer in sequence. When several RLC SDUs belonging to one original RLC SDU are received after segmentation, in-sequence delivery of the NR RLC entity may include reassembly and delivery of the RLC SDUs.

[0052] In-sequence delivery of NR RLC may include reordering received RLC PDUs based on RLC sequence number (SN) or PDCP SN, recording lost RLC PDUs through reordering, reporting the status of lost RLC PDUs to the transmitting side, and requesting retransmission of lost RLC PDUs.

[0053] If there is a lost RLC SDU, the in-sequence delivery of the NR RLC entity may include delivering only the RLC SDUs preceding the lost RLC SDU to the upper layer in-sequence.

[0054] Despite the presence of lost RLC SDUs, if a specified timer has expired, the in-sequence delivery of the NR RLC entity may include delivering in-sequence to the upper layer all RLC SDUs received before the timer is started, and may include delivering in-sequence to the upper layer all RLC SDUs received up to the current time.

[0055] The NR RLC entity may process the RLC PDUs in the order in which they are received regardless of the order of the sequence numbers and deliver the RLC PDUs to the NR PDCP entity in an out-of-sequence delivery manner.

[0056] When the segments are received, the NR RLC entity can reconstruct a complete RLC PDU from the segments stored in the buffer or received later and deliver the RLC PDU to the NR PDCP entity.

[0057] The NR RLC layer may not include the concatenation function, which may be performed by the NR MAC layer or may be replaced by the multiplexing function of the NR MAC layer.

[0058] In the above description, out-of-sequence delivery of the NR RLC entity may refer to a function of directly delivering RLC SDUs received from a lower layer to a higher layer regardless of the order. If several RLC SDUs belonging to one original RLC SDU are received after segmentation, the out-of-sequence delivery of the NR RLC entity may include reassembly and delivery of the RLC SDUs. The out-of-sequence delivery of the NR RLC entity may include storing the RLC SN or PDCP SN of the received RLC PDUs and sorting them to record lost RLC PDUs.

[0059] NR MAC 4-15 and 4-30 can be connected to several NR RLC entities configured in one UE, and the main functions of NR MAC may include mapping between logical channels and transport channels, multiplexing / demultiplexing of MAC SDU, scheduling information reporting, error correction through HARQ, priority handling between logical channels of one UE, priority handling between UEs with the help of dynamic scheduling, MBMS service identification, transport format selection, and padding.

[0060] NR PHY 4-20 and 4-25 can compose OFDM symbols from higher layer data through channel coding and modulation and transmit through a radio channel, or can demodulate and channel-decode OFDM symbols received through a radio channel and forward the results to a higher layer.

[0061] Figure 5 The structure of a UE according to an embodiment is shown.

[0062] refer to Figure 5 , the UE includes a radio frequency (RF) processor 5-10, a baseband processor 5-20, a storage device 5-30, and a controller 5-40.

[0063] The RF processor 5-10 performs functions for transmitting and receiving signals through a radio channel, such as signal band conversion and amplification. The RF processor 5-10 performs up-conversion of the baseband signal provided by the baseband processor 5-20 into an RF band signal and transmits the signal through the antenna, and performs down-conversion of the RF band signal received through the antenna into a baseband signal. For example, the RF processor 5-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), and an analog-to-digital converter (ADC). Although only one antenna is shown in the figure, the UE can be provided with multiple antennas. The RF processor 5-10 may include multiple RF chains and can perform beamforming by adjusting the phase and amplitude of each signal transmitted and received through multiple antennas or antenna elements. The RF processor can perform MIMO and can receive multiple layers during MIMO operation.

[0064] The baseband processor 5-20 converts baseband signals into bitstreams according to the system's physical layer specifications. For example, during data transmission, the baseband processor 5-20 encodes and modulates the transmit bitstream to generate complex symbols. During data reception, the baseband processor 5-20 recovers the received bitstream by demodulating and decoding the baseband signal provided by the RF processor 5-10. For example, when utilizing OFDM, for data transmission, the baseband processor 5-20 encodes and modulates the transmit bitstream to generate complex symbols, maps the complex symbols to subcarriers, and constructs OFDM symbols through an inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion. For data reception, the baseband processor 5-20 separates the baseband signal provided by the RF processor 5-10 into OFDM symbols, recovers the signals mapped to the subcarriers through a fast Fourier transform (FFT), and recovers the received bitstream through demodulation and decoding.

[0065] The baseband processor 5-20 and the RF processor 5-10 transmit and receive signals, as described above. Therefore, the baseband processor 5-20 and the RF processor 5-10 can be referred to as transmitters, receivers, transceivers, or communication units. In order to support different radio access technologies, at least one of the baseband processor 5-20 or the RF processor 5-10 may include multiple communication modules. In addition, in order to process signals of different frequency bands, at least one of the baseband processor 5-20 or the RF processor 5-10 may include different communication modules. For example, different radio access technologies may include wireless LAN (e.g., IEEE 802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include ultra-high frequency (SHF) bands (e.g., 2.NRHz, NRhz) and millimeter wave bands (e.g., 60 GHz).

[0066] The storage device 5-30 stores data such as basic programs, applications, and configuration information for the operation of the UE. In particular, the storage device 5-30 may store information about a second access node that performs wireless communication using a second radio access technology. The storage device 5-30 provides the stored data in response to a request from the controller 5-40.

[0067] The controller 5-40 controls the overall operation of the UE. For example, the controller 5-40 transmits or receives signals through the baseband processor 5-20 and the RF processor 5-10 and writes or reads data to or from the storage device 5-40. To this end, the controller 5-40 may include at least one processor. For example, the controller 5-40 may include a communication processor for controlling communications and an application processor (AP) for controlling higher layers such as application programs.

[0068] Figure 6 The structure of the NR BS according to the embodiment is shown.

[0069] refer to Figure 6 , the NR BS includes an RF processor 6-10, a baseband processor 6-20, a backhaul communication unit 6-30, a storage device 6-40 and a controller 6-50.

[0070] The RF processor 6-10 performs functions for transmitting and receiving signals through a radio channel, such as signal band conversion and amplification. The RF processor 6-10 performs up-conversion of the baseband signal provided by the baseband processor 6-20 into an RF band signal and transmits the converted signal through the antenna, and performs down-conversion of the RF band signal received by the antenna into a baseband signal. For example, the RF processor 6-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC. Although only one antenna is shown in the figure, the first access node may be provided with multiple antennas. Additionally, the RF processor 6-10 may include multiple RF chains. The RF processor 6-10 may perform beamforming. For beamforming, the RF processor 6-10 may adjust the phase and amplitude of each signal transmitted and received by multiple antennas or antenna elements. The RF processor may perform DL MIMO operations by transmitting one or more layers.

[0071] The baseband processor 6-20 performs conversion between baseband signals and bit streams according to the physical layer specifications of the first radio access technology. For example, for data transmission, the baseband processor 6-20 generates complex symbols by encoding and modulating the transmit bit stream. For data reception, the baseband processor 6-20 recovers the receive bit stream by demodulating and decoding the baseband signal provided by the RF processor 6-10. For example, when OFDM is used, for data transmission, the baseband processor 6-20 generates complex symbols by encoding and modulating the transmit bit stream, maps the complex symbols to subcarriers, and constructs OFDM symbols through IFFT operations and CP insertion. For data reception, the baseband processor 6-20 separates the baseband signal provided by the RF processor 6-10 in units of OFDM symbols, recovers the signals mapped to the subcarriers through FFT operations, and recovers the receive bit stream through demodulation and decoding. The baseband processor 6-20 and the RF processor 6-10 transmit and receive signals as described above. Therefore, the baseband processor 6-20 and the RF processor 6-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0072] The backhaul communication unit 6-30 provides an interface for communicating with other nodes in the network. The backhaul communication unit 6-30 converts a bit stream to be transmitted from the master BS to another node (such as a secondary BS or a core network) into a physical signal, and converts a physical signal received from another node into a bit stream.

[0073] The storage device 6-40 stores data such as basic programs, applications, and configuration information for the operation of the master BS. In particular, the storage device 6-40 can store information about bearers allocated to connected UEs and measurement results reported from connected UEs. The storage device 6-40 can also store information used as a criterion for determining whether to provide or terminate multiple connections to a UE. In addition, the storage device 6-40 provides the stored data in response to a request from the controller 6-50.

[0074] The controller 6-50 controls the overall operation of the NR BS. For example, the controller 6-50 transmits and receives signals through the baseband processor 6-20 and the RF processor 6-10 or through the backhaul communication unit 6-30. The controller 6-50 writes data to or reads data from the storage device 6-40. To this end, the controller 6-50 may include at least one processor.

[0075] The NCR disclosed herein is divided into a mobile transmission (MT) section and a forwarding device (FWD) section. The FWD section receives signals from a cell, amplifies, and forwards them, or receives signals from a UE, amplifies them, and forwards them toward the NR base station (BS). Furthermore, the MT section can receive the beam-related configuration of the FWD section from the NR base station and transmit the beam-related configuration to the FWD section.

[0076] The FWD state can be set to ON or OFF. ON indicates that the FWD amplifies the cell's signal and forwards it to the UE, or amplifies the UE's signal and forwards it to the NR BS's cell. OFF indicates that signal reception and amplification are not performed (i.e., suspended).

[0077] For reference, the content of the agreement after 3GPP RAN2#120 related to the NCR of the present disclosure is shown in Table 1 below.

[0078] Table 1

[0079]

[0080] In Table 1, even if the MT of the NCR transitions to an idle / inactive state, the FWD can remain in the on state for the originally connected cell. Furthermore, since the MT can perform cell reselection in the idle / inactive state, it can reselect to a cell other than the cell for which the FWD is currently performing amplification / forwarding according to the cell reselection criteria. To address this issue, the present disclosure proposes a method for matching the cell for which the FWD is currently performing amplification / forwarding with the cell associated with the MT when there is a mismatch between the two.

[0081] The first solution (Sol1) in this document addresses situations where an inactive / idle NCR-MT is prohibited from performing cell reselection. To this end, when the serving gNB transmits an RRCRelease (RRC Release) message to the NCR-MT, including the RRCRelease or suspendConfig fields, the RRCRelease message may include an indication prohibiting cell reselection. A MT that receives this indication may transition to idle or inactive mode and avoid performing cell reselection. With or without the prohibition indication, the MT may avoid performing cell reselection when transitioning to idle or inactive mode. Even when cell reselection is not performed, to meet a specific signal level of the serving cell, the network must detect when the signal strength of the serving cell drops below a certain level. To achieve this, the serving gNB may transmit reference signal received power (RSRP) / reference signal received quality (RSRQ) thresholds to the UE.

[0082] As an absolute value, the threshold can be a single value or can consist of an offset value. In this case, the message can be RRCRelease (with or without suspendConfig).

[0083] The MT that receives the single absolute value threshold information can measure the signal strength of the current serving cell in idle / inactive mode. If the measured value is less than the received RSRP / RSRQ threshold, the MT can perform a recovery or connection setup procedure.

[0084] Alternatively, an MT receiving a single offset value may measure the signal strength of the current serving cell in idle / inactive mode. If the signal strength of the current serving cell decreases by more than the offset value relative to the time point when the RRC message including the offset value is received, the MT may perform a recovery or connection setup procedure.

[0085] When transmitting an RRC resume or RRC setup message, the MT may include an indication indicating that the serving cell signal is degraded as a cause value in the message.

[0086] The second solution (Sol2) herein relates to the case when the cell of the NCR-FWD is changed to a cell reselected by the MT.

[0087] In the first option (Opt 1), FWD can be disabled when the MT performs cell reselection and selects a cell different from the current serving cell, and the MT camps on the corresponding cell in the normal camping state, or when the MT is connected to the most recently camped cell. Alternatively, the NCR can change another cell selected by the MT to the new target cell for FWD.

[0088] The RRCRelease (with or without suspendConfig) message may include instructions directing the above operations.

[0089] The MT receiving the above message may transition to an idle / inactive mode and may then transmit a signal to the FWD internally to turn off the FWD when performing cell reselection.

[0090] Before delivering the message including the above instructions to the NCR-MT, the serving BS may pre-configure conditional handover for the connected mode UE receiving NCR services. This is to prevent the corresponding UE from suddenly losing its serving cell due to FWD shutdown when the MT reselects a cell.

[0091] The BS of the newly selected cell may request context retrieval of the NCR FWD and / or MT from the BS of the cell for which the FWD has performed amplification / forwarding. To this end, a context retrieval request message and a corresponding response message may be transmitted and received between the two BSs as Xn messages.

[0092] In the second option (Opt 2), the MT can perform normal cell reselection. If a different cell is reselected, the MT can instruct the FWD to change the cell. Upon receiving this instruction, the FWD can remain in the on state and amplify / forward the signal of the new cell, while stopping the amplification / forwarding operation of the signal of the existing cell.

[0093] The MT internally transmits an indication to the FWD to change the cell, and the FWD autonomously changes its signal source.

[0094] The third solution herein (Sol3) involves redirecting the MT to the original cell.

[0095] If the MT reselects a new cell, the MT may perform an RRC recovery (if the MT is inactive) or an RRC setup (if the MT is idle) procedure. In this case, the UL RRC message may include a new cause value.

[0096] The new cause value may indicate that redirection of the MT is requested for NCR-FWD control, or may indicate that the NCR-MT has performed reselection to a new cell.

[0097] Alternatively, the MT can transmit the signal strength measurement results of the cell for which the FWD initially performed amplification / forwarding to the serving cell by including them in the UL RRC message. Alternatively, as in conventional operation, the UEInformationReq / Resp.msg can be used to obtain the measurement results in idle / inactive situations.

[0098] The BS of the serving cell that receives the UL RRC message may command handover to the serving cell for which the FWD has performed amplification / forwarding. Measurement information of the original cell included in the UL RRC message may be considered.

[0099] The serving BS may determine to change the target of FWD to the current serving cell instead of handing over to the original cell. In this case, the BS of the current serving cell may request NCR context retrieval from the BS of the original cell and obtain the result.

[0100] In this case, the current serving BS may command the MT to turn off the amplification / forwarding operation of the FWD for the original cell via a DL RRC message, a DL Medium Access Control (MAC) Control Element (CE), or DL ​​Control Information (DCI) through the current serving cell.

[0101] Alternatively, if the MT reselects a new cell, it can request a resume or connection setup. The gNB of the corresponding serving cell can send an RRC Reject message to the MT. In addition, the redirecting cell information can be included in the corresponding rejection message.

[0102] In this case, the restore / setup request message transmitted by the MT may also include a new cause value and / or measurement information of the original cell used in case A.

[0103] The BS of the serving cell that receives the request message may include the following information in an RRCReject or RRCrelease message.

[0104] The redirected cell information may be the PCI (physical cell ID) / frequency information / CGI (cell global ID) of the original cell.

[0105] If a corresponding cell is found, the MT that receives the above message may immediately reselect the corresponding cell.

[0106] The fourth solution (Sol4) of this invention is now described. Although the MT may perform cell reselection to another cell, the FWD may be allowed to continue amplifying and forwarding for the existing cell regardless of this, and the FWD may also perform RRC recovery or RRC connection setup with the newly camped cell to amplify / forward the signal of the new cell in the connected state.

[0107] In this case, the RRC resume / RRC setup request message including the new cause value in Sol3 described above may be transmitted to the serving cell.

[0108] The BS receiving the UL RRC message may transmit a resume or setup message to the MT, and may then deliver control information for amplification and forwarding on the new cell to the MT through an RRCReconfiguration message or a DL MAC CE / DCI.

[0109] Figure 7 It shows the case when the MT is not allowed to perform cell reselection according to an embodiment.

[0110] exist Figure 7 In step S710 , NCR MT 702 and FWD 701 are in connected mode with cell 1 ( 721 ).

[0111] In step S720 , the FWD 701 in the on state amplifies / forwards the signal of the cell 1 ( 721 ), amplifies the signal of the UE 710 and forwards the signal to the cell 1 ( 721 ).

[0112] In this case, in step S730, a command to transition MT 702 to idle or inactive mode may be received from cell 1 (721). The RRCRelease (with or without suspendConfig) message may include an indication not to perform cell reselection and may also include RSRP / RSRQ threshold information.

[0113] In step S740, the MT 702 that has received the command may transition to idle / inactive mode without performing cell reselection. Then, the MT 702 may measure the signal strength of the current serving cell only. If, in step S750, the measured signal strength of the current serving cell falls below a given quality threshold, the MT 702 may issue a resume or setup request to the cell 1 (721) in step S760. The RRCresumeRequest (resume request) or RRCsetupRequest (setup request) message used in this case may include an NCR access indication or an indication of signal degradation of the current serving cell as a cause value. In step S770, the cell 1 (721) that has received the above message may command the MT (702) of the NCR to resume or setup, and may exchange signals for controlling beam information of the FWD 701 with the MT 702.

[0114] Figure 8 It shows the situation when the MT is allowed to perform cell reselection but FWD is turned off according to an embodiment.

[0115] exist Figure 8 In step S810 , NCR MT 802 and FWD 801 are in connected mode with cell 1 ( 821 ).

[0116] In step S820, FWD 801 amplifies / forwards the signal of cell 1 (821), amplifies the signal of UE 810, and forwards the signal of UE 810 to cell 1 (821). In step S821, cell 1 (821) can pre-configure conditional handover to a cell other than cell 1 (821) for connected mode UE 810 served by the NCR.

[0117] Thereafter, in step S830 , MT 802 may receive a command to transition to idle or inactive mode from cell 1 ( 821 ). The RRCRelease (with suspendConfig) message may include an indication to turn off FWD upon cell reselection.

[0118] In step S840, MT 802, having received the above command, may transition to idle / inactive mode and may perform cell reselection. Cell reselection is a process of finding a new cell based on a given metric based on measurements of candidate frequencies / cells. If MT 802 discovers a new cell during this process and determines to camp on the cell, then in step S850, MT 802 may camp on the corresponding cell 822 (e.g., cell 2), deliver an instruction to FWD 801 to change the FWD 801 to the off state in step S851, and suspend FWD 801's signal amplification / forwarding with respect to cell 1 (821) in step S852. When the UE 810 exchanging signals with the cell 1 (820) through the FWD 801 is prohibited from transmitting or receiving signals to or from the cell 1 (821) due to the off state of the FWD 801 in step S853, they can perform conditional handover to other cells based on the conditional handover configuration provided in advance by the cell 1 (821) in step S854.

[0119] When MT 802 camps on cell 2 (822) after reselection, in step S860, MT 802 may issue an RRC resume or connection setup request to cell 2 (822). In this case, the RRC resume or connection setup request may include an indication that the NCR expects a new network connection as a new cause value.

[0120] If necessary, in step S870, BS 822 of cell 2, having received the corresponding message, may transmit a message requesting context retrieval for NCR and MT 802 to BS 821 of cell 1. In response, in step S870, BS 821 of cell 1 may provide BS 822 of cell 2 with index information of the beam used on the access link for NCR control in the previous cell, frequency information of the cell, SCS (subcarrier spacing) information, and FWD on / off time information through a context retrieval response.

[0121] After that, MT 802, which has completed the RRC recovery / RRC setup process with cell 2 (822) in step S880, can receive control information from cell 2 (822) that enables FWD 801 to amplify / forward the signal of cell 2 (822), and can control FWD 801 based on this in step S890. In this case, the beam of the access link previously used in cell 1 (821) can be reused.

[0122] Figure 9 It shows the situation when the MT is allowed to do cell reselection but the redirection is directed to the original cell according to an embodiment.

[0123] refer to Figure 9, in step S910 , NCR MT 902 and FWD 901 are in connected mode with cell 1 ( 921 ).

[0124] In step S920 , the FWD 901 amplifies / forwards the signal of the cell 1 ( 921 ), and amplifies the signal of the UE 910 and forwards the signal to the cell 1 ( 921 ).

[0125] Thereafter, in step S930 , MT 902 may receive a command to transition to idle or inactive mode from cell 1 ( 921 ). The RRCRelease (with or without suspendConfig) message may include an indication to issue a resume / setup request upon cell reselection.

[0126] After transitioning to the idle / inactive mode in step S940, when MT 902 performs cell reselection for another cell 922 in step S950, MT 902 may transmit a restore / setup request message to cell 2 (922) according to the given indication in the above message in step S960. In this case, the restore / setup request message may include an indication that it is for an NCR connection as a cause value.

[0127] In step S970 , the cell 2 ( 922 ) that receives the above message may transmit an RRCresume or RRCsetup message to the NCR.

[0128] Thereafter, in step S980, cell 2 (922) may instruct the NCR to perform handover to cell 1 (901), which is the target of amplification / forwarding of FWD 901, based on the measurement result information or other information. If it is determined not to perform handover, cell 2 (922) may turn off the FWD operation with respect to cell 1 (921) and then instruct MT 902 to newly set the FWD operation with respect to cell 2 (922). This command may be indicated by a specific field "off-and-on with newcell" in the RRC message, or may be indicated by a DL MAC CE or DCI.

[0129] In step S990 , the MT 902 that received the handover command may perform handover to the cell 1 ( 921 ) and receive information for controlling the NCR FWD 901 from the cell 1 ( 921 ).

[0130] Alternatively, when MT 902 transmits an RRCresumeRequest / RRCsetupRequest message to cell 2 (922), cell 2 (922) may transmit an RRCreject or release message to MT 902, which may command MT 902 to redirect to cell 1 (921) as the original cell.

[0131] Figure 10 A case is shown when FWD performs amplification / forwarding for a plurality of cells according to an embodiment.

[0132] refer to Figure 10 , in step S1010 , NCR MT 1002 and FWD 1001 are in connection mode with cell 1 ( 1021 ).

[0133] In step S1020 , the FWD 1001 in the on state amplifies / forwards the signal of the cell 1 ( 1021 ), amplifies the signal of the UE 1010 , and forwards the signal of the UE 1010 to the cell 1 ( 1021 ).

[0134] Thereafter, in step S1030 , MT 1002 may receive a command to transition to idle or inactive mode from cell 1 ( 1021 ). The RRCRelease (with or without suspendConfig) message may include an indication to make a resume / setup request upon cell reselection.

[0135] After transitioning to the idle or inactive mode in step S1040, when MT 1002 performs cell reselection for cell 2 (1022) in step S1050, MT 1002 may transmit a resume or setup request message to cell 2 (1022) in step S1060, and may receive an RRCresume or RRCsetup message as a response from cell 2 (1022) in step S1070. In this case, the resume or setup request message may include an indication that it is for an NCR connection as a new cause value.

[0136] The BS 1022 of cell 2 may exchange NCR / MT context with the BS 1021 of cell 1 as needed. The context may include capability information regarding whether the NCR can amplify / forward signals of multiple cells, and may include at least one of information regarding the cell (e.g., cell 1) whose signal is currently amplified / forwarded, information regarding the access link beam being used, or information regarding the frequency band of cell 1. Therefore, cell 2 (1022) may recognize that the corresponding MT 1002 is the NCR, and recognize that the MT 1002 is currently amplifying / forwarding signals related to cell 1 (1021). For example, if the NCR is capable of amplifying / forwarding signals for multiple cells, then in step S1080, cell 2 (1022) may transmit a setting for amplifying and forwarding the signal of cell 2 to the NCR via an RRC reconfiguration message, thereby controlling the NCR to perform amplification / forwarding of the signal of cell 2 (1022) in steps S1090 and S1091.

[0137] The methods according to the embodiments described herein may be implemented in the form of hardware, software or a combination thereof.

[0138] When implemented using software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium may be configured to be executable by one or more processors of an electronic device. The one or more programs may include instructions that cause the electronic device to perform the methods according to embodiments of the present disclosure.

[0139] Such programs (software modules, software) may be stored in random access memory (RAM), non-volatile memory such as flash memory, read-only memory (ROM), electrically erasable programmable ROM (EEPROM), magnetic disk storage, compact disc-ROM (CD-ROM), digital versatile disc (DVD) or other types of optical storage devices and / or magnetic tape cartridges. Alternatively, such programs may be stored in a memory comprising a combination of some or all of the memories. In addition, multiple component memories may be included.

[0140] Such programs may be stored in an attachable storage device that is accessible via a communications network such as the Internet, an intranet, a local area network (LAN), a wide area LAN (WLAN), or a storage area network (SAN), or a combination thereof. Such a storage device may access a device executing embodiments of the present disclosure via an external port. Alternatively, a separate storage device on a communications network may access a device executing embodiments.

[0141] The blocks and flow chart combinations of the flowcharts (or sequence diagrams) herein can be executed by computer program instructions loaded onto a processor of a general-purpose computer, a special-purpose computer, or a programmable data processing device. When the loaded program instructions are executed by the processor, they cause the functions described in the flowchart to be performed. Because computer program instructions can be stored in a computer-readable memory usable in a special-purpose computer or a programmable data processing device, it is also possible to create an article of manufacture that performs the functions described in the flowchart. Because the computer program instructions can be loaded onto a computer or a programmable data processing device, when executed as a process, they can perform the steps of the functions described in the flowchart.

[0142] In addition, the blocks of the flowchart may correspond to modules, segments or codes containing one or more executable instructions that implement one or more logical functions, or to portions thereof. In some cases, the functions described by the blocks may be performed in an order different from the order in which they are listed. For example, two blocks listed in sequence may be executed simultaneously or in reverse order, depending on the corresponding functions.

[0143] Throughout this specification, the terms unit, module, etc. may refer to software or hardware components capable of performing a function or operation, such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). However, units are not limited to hardware or software and may be configured to reside in an addressable storage medium or drive one or more processors. Units, etc. may refer to software components, object-oriented software components, class components, task components, processes, functions, attributes, programs, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, or variables. The functions provided by components and units may be a combination of fewer components and units, and may be combined with other components and units to form more components and units that can be configured to drive one or more processors in a device or secure multimedia card. Units, etc. may include one or more processors.

[0144] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a network controlled repeater (NCR) node in a communication system, the method comprising: Forwarding (Fwd) by an NCR node (NCR-Fwd) performs signal forwarding between the terminal and the base station based on first control information received from the base station; receiving, by a mobile terminal (MT) of the NCR node (NCR-MT), a radio resource control (RRC) release message from the base station; The NCR-MT performs cell reselection in the RRC inactive state based on the RRC release message including information about the suspension configuration; as well as In the case that the NCR-MT reselects a cell other than the last serving cell of the base station, the NCR-MT instructs the NCR-Fwd to stop forwarding the signal.

2. The method according to claim 1, further comprising: If the RRC release message does not include information about the suspension configuration, transitioning from the RRC connected state to the RRC idle state; as well as Based on the NCR-MT transitioning to the RRC idle state, the NCR-MT instructs the NCR-Fwd to stop forwarding the signal.

3. The method according to claim 1, further comprising: transmitting, by the NCR-MT, an RRC recovery request message to a base station associated with the cell based on the cell being reselected; as well as An RRC resume message is received by the NCR-MT from a base station associated with the cell as a response to the RRC resume request message.

4. The method according to claim 3, The RRC recovery request message includes information indicating that the NCR node requests a connection to a base station associated with the cell.

5. The method according to claim 3, further comprising: receiving, by the NCR-MT, second control information from a base station associated with the cell to forward a signal associated with the cell; as well as The second control information is applied by the NCR-Fwd.

6. The method according to claim 1, The second control information includes at least one of information about a beam used by signal forwarding associated with the last serving cell, information about a frequency of the cell, or information about a subcarrier spacing.

7. The method according to claim 5, further comprising: The NCR-Fwd forwards a signal associated with the last serving cell based on the first control information and forwards a signal associated with the cell based on the second control information.

8. A network control repeater (NCR) node in a communication system, the NCR node comprising: transceiver; and A controller configured to: controlling the forwarding (Fwd) of the NCR node (NCR-Fwd) to perform signal forwarding between the terminal and the base station based on first control information received from the base station, A mobile terminal (MT) (NCR-MT) controlling the NCR node receives a radio resource control (RRC) release message from the base station, controlling the NCR-MT to perform cell reselection in the RRC inactive state based on the RRC release message including information about the suspension configuration, and In the case that the NCR-MT reselects a cell other than the last serving cell of the base station, the NCR-MT is controlled to instruct the NCR-Fwd to stop forwarding the signal.

9. The NCR node according to claim 8, wherein the controller is further configured to: In a case where the RRC release message does not include information about the suspension configuration, controlling the NCR-MT to transition from an RRC connected state to an RRC idle state, and Based on the NCR-MT transitioning to the RRC idle state, the NCR-MT is controlled to instruct the NCR-Fwd to stop forwarding the signal.

10. The NCR node according to claim 8, wherein the controller is further configured to: controlling the NCR-MT to transmit an RRC recovery request message to a base station associated with the cell based on the cell being reselected, and The NCR-MT is controlled to receive an RRC resume message from a base station associated with the cell as a response to the RRC resume request message.

11. The NCR node according to claim 10, The RRC recovery request message includes information indicating that the NCR node requests a connection to a base station associated with the cell.

12. The NCR node according to claim 10, wherein the controller is further configured to: controlling the NCR-MT to receive second control information from a base station associated with the cell to forward a signal associated with the cell, and The NCR-Fwd is controlled to apply the second control information.

13. The NCR node according to claim 8, The second control information includes at least one of information about a beam used by the signal forwarding associated with the last serving cell, information about a frequency of the cell, or information about a subcarrier spacing.

14. The NCR node according to claim 12, The controller is further configured to control the NCR-Fwd to forward a signal associated with the last serving cell based on the first control information and to forward a signal associated with the cell based on the second control information.

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