Wireless base station

Abstract

A wireless base station performs wireless communication with a terminal via a secondary cell, and when a candidate for the secondary cell is set, a priority for the secondary cell is set. The wireless base station sets the priority on the basis of at least one of the energy consumption cost in the secondary cell, the required communication quality, and the capability of the terminal.

Description

Technical Field

[0001] This disclosure relates to wireless base stations that contribute to reducing the energy consumption of networks. Background Technology

[0002] The 3rd Generation Partnership Project (3GPP, registered trademark) standardized the 5th generation mobile communication system (also known as 5G, New Radio (NR), or Next Generation (NG)) and also standardized the next generation known as Beyond 5G, 5G Evolution, or 6G.

[0003] For example, in 3GPP Release 18, technologies for reducing the energy consumption of networks containing gNBs (NES: Network Energy Saving) are being studied (Non-Patent Document 1). Specifically, studies are being conducted on migrating cells formed by gNBs to a dormant state or applying DTX / DRX (Discontinuous Transmission / Discontinuous Reception) to perform gNB-based transmission and reception intermittently (Non-Patent Documents 2, 3).

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent literature 1: "New WID: Network energy savings for NR", RP-223540, 3GPPTSG RAN Meeting #98-e, 3GPP, December 2022

[0007] Non-Patent Document 2: "Report of 3GPP TSG RAN WG2 meeting #123, Toulouse, France", 3GPP, August 2023

[0008] Non-patent document 3: "Status Report to TSG", RP-231926, 3GPP TSG RAN meeting #101, 3GPP, September 2023 Summary of the Invention

[0009] Furthermore, existing SCell changes are performed as follows: based on the measurement report from the user equipment (UE), an SCell addition or SCell release is sent from the gNB to the UE using RRC signaling. That is, the UE cannot change its SCell independently.

[0010] Furthermore, when a UE autonomously adds or changes a SCell, the decision is based solely on cell quality. Moreover, when performing Conditional Handover (CHO), Conditional PSCell Adoption Change (CPAC), or Lower Layer Triggered Mobility (LTM), the UE only monitors the quality of the candidate target cell to determine execution. This presents the following problem: even considering factors such as SCell congestion and NES cells, it cannot autonomously add or change cells.

[0011] Therefore, the following disclosure is made in view of the situation and its purpose is to provide a wireless base station that can enable appropriate cell additions or changes even when a technology for reducing network energy consumption (NES) is introduced.

[0012] One aspect of this disclosure is a terminal (UE 200) comprising: a control unit (control unit 270) that controls cell migration of the terminal according to low-layer mobility control; and a receiving unit (control signal...). Referring to the signal processing unit 240, which receives a message containing the execution conditions for the cell migration from the network, the control unit performs the cell migration if the pause execution conditions applied when the source cell of the migration source or the candidate cell of the migration destination is transferred to the pause state are met.

[0013] One aspect of this disclosure is a wireless base station (gNB 100) comprising: a receiver (control signal...) The reference signal processing unit (240) receives a measurement report from the terminal (UE 200); and the control unit (control unit 270) sets a candidate of multiple sub-cells that the terminal can autonomously select based on the measurement report.

[0014] One aspect of this disclosure is a terminal (UE 200) comprising: a receiver (control signal) The reference signal processing unit (240) receives signaling that the subcell is transferred to a lower layer in a rest state accompanied by a reduction in energy consumption; and the control unit (control unit 270) deletes or deactivates the subcell upon receiving the signaling.

[0015] One aspect of this disclosure is a wireless base station (gNB 100) comprising: a communication unit (wireless signal transceiver 210) that performs wireless communication with a terminal via a subcell; and a control unit (control unit 270) that, when setting candidates for the subcell, sets a priority for the subcell, the control unit setting the priority based on at least one of the energy consumption cost of the subcell, the required communication quality, and the capabilities of the terminal. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the wireless communication system 10.

[0017] Figure 2 This is a diagram illustrating an example of the structure of wireless frames, subframes, and time slots used in the wireless communication system 10.

[0018] Figure 3 This is the function block structure diagram of gNB 100 and UE 200.

[0019] Figure 4 This is a diagram illustrating an example of the structure of a primary cell and a secondary cell.

[0020] Figure 5 This is a diagram illustrating the setting timing example of the SCell involved in Action Example 1.

[0021] Figure 6 This is a diagram illustrating the setting timing example of the SCell involved in action example 2.

[0022] Figure 7 This is a diagram illustrating an example of the hardware structure of gNB 100 and UE 200.

[0023] Figure 8 This is a diagram showing a structural example of vehicle 2001. Detailed Implementation

[0024] The embodiments are described below based on the accompanying drawings. Furthermore, the same or similar reference numerals are used to denote the same function or structure, and their descriptions are omitted where appropriate.

[0025] (1) Overall general structure of wireless communication system

[0026] Figure 1This is a schematic diagram of the overall structure of the wireless communication system 10 involved in this embodiment. The wireless communication system 10 is a wireless communication system that follows 5G New Radio (NR) and includes a Next Generation Radio Access Network (NG-RAN 20) and a terminal 200 (User Equipment 200, UE 200).

[0027] Furthermore, the wireless communication system 10 can be a wireless communication system following protocols known as Beyond 5G, 5G Evolution, or 6G, or it can include wireless communication systems following protocols known as Long Term Evolution (LTE) or 4G. The wireless communication system 10 can support functions related to the Industrial Internet of Things (IIoT) and Ultra-Reliable and Low Latency Communications (URLLC).

[0028] NG-RAN 20 includes a radio base station 100 (hereinafter referred to as gNB 100). Furthermore, the specific structure of the wireless communication system 10, including the number of gNBs (or eNBs, etc.) and UEs, is not limited to... Figure 1 The example shown.

[0029] Additionally, the gNB 100 can also use the fronthaul (FH) interface defined by the O-RAN (Open Radio Access Network Alliance). The gNB 100 can include an O-DU (O-RAN Distributed Unit) and an O-RU (O-RAN Radio Unit). The gNB100 can function as an NG-RAN node.

[0030] NG-RAN 20 actually comprises multiple NG-RAN nodes, specifically multiple gNBs (or ng-eNBs), connected to a 5G-compliant core network (5GC, not shown). NG-RAN 20 and 5GC can also be simply referred to as a "network." Within 5GC, the concept of CUPS (Control and User Plane Separation), which explicitly separates the functions of the user plane and the control plane, can be introduced.

[0031] The gNB 100 is a NR-compliant radio base station that performs NR-compliant wireless communication with the UE 200. Furthermore, the gNB 100 can be configured to include a CU (Central Unit) and a DU (Distributed Unit), with the DU located separately from the CU in geographically different locations. A CU can connect to one or more DUs. Additionally, gNB 100s (gNB-CU) can connect to each other via an Xn interface, and CUs and DUs can connect via an F1 interface (F1-AP, etc.).

[0032] The gNB 100 and UE 200 can support Massive MIMO, which generates more directional beams by controlling radio signals transmitted from multiple antenna elements; Carrier aggregation (CA), which uses multiple component carriers (CC); and Dual connectivity (DC), which enables simultaneous communication between the UE and various nodes of multiple NG-RAN nodes.

[0033] The DC can be of the following types: Multi-RAT Dual Connectivity (MR-DC) which utilizes multiple radio access technologies, or NR-NR Dual Connectivity (NR-DC) which utilizes only NR. For example, any gNB can form the master node (MN), and one or more other gNBs can form the slave nodes (SN).

[0034] In addition, the wireless communication system 10 can support multiple frequency ranges (FRs) as shown below.

[0035] FR1: 410MHz~7.125GHz

[0036] FR2-1: 24.25GHz~52.6GHz

[0037] In FR1, sub-carrier spacing (SCS) of 15, 30, or 60 kHz can be used, and bandwidth (BW) of 5–100 MHz can be used. FR2-1 is a higher frequency than FR1, and sub-carrier spacing (SCS) of 60 or 120 kHz (including 240 kHz) can be used, as well as bandwidth (BW) of 50–400 MHz.

[0038] Furthermore, SCS can be interpreted as a numerology. The numerology is defined in 3GPP TS 38.300 and corresponds to a subcarrier spacing in the frequency domain.

[0039] Furthermore, the wireless communication system 10 also supports frequency bands higher than FR2-1. Specifically, the wireless communication system 10 supports frequency bands exceeding 52.6 GHz and up to 71 GHz. Such high-frequency bands can also be referred to as FR2-2.

[0040] When using a band domain exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM) with larger sub-carrier spacing (SCS) can be applied.

[0041] Furthermore, in high-frequency bands like FR2-2, as mentioned above, the increase in inter-carrier phase noise becomes a problem. Therefore, a larger (wider) SCS or single-carrier waveform is required.

[0042] The larger the SCS, the shorter the symbol / CP (Cyclic Prefix) period and the slot period (while maintaining a 14 symbol / slot structure). Figure 2 An example of the structure of wireless frames, subframes, and time slots used in wireless communication system 10 is shown.

[0043] While maintaining a 14-symbol / slot structure, a larger (wider) SCS results in a shorter symbol period (and slot period). Furthermore, the symbol period can also be referred to as symbol length, time direction, or time domain, etc. Additionally, the frequency direction can be referred to as frequency domain, resource block, subcarrier, BWP (Bandwidth part), etc.

[0044] Frequency resources can include component carriers (CC), subcarriers, resource blocks (RB), resource block groups (RBG), and BWP (Bandwidth part). Time resources can include symbols, time slots, mini-time slots, subframes, radio frames, and DRX (Discontinuous Reception) periods.

[0045] Furthermore, the number of symbols constituting one time slot does not necessarily have to be 14 symbols (e.g., 28 symbols, 56 symbols). In addition, the number of time slots in each subframe can vary depending on the SCS.

[0046] In addition, the wireless communication system 10 can support conditional handover (CHO). In CHO, candidate cells for handover and execution conditions for handover (also known as migration) to candidate cells are pre-set for UE 200.

[0047] Therefore, the UE 200 can hand over to the target radio base station (also known as the target cell) without waiting for a handover instruction from the network.

[0048] A CHO can be interpreted as a handover performed by the UE200 when one or more execution conditions are met. The UE200 can begin evaluating the execution conditions upon receiving a CHO setting and stop evaluating the execution conditions during handover (traditional handover or conditional handover).

[0049] Candidate gNBs or potential target gNBs can provide CHO settings to UE 200. Source gNBs can provide UE 200 with execution conditions, such as timing, to trigger the CHO. Execution conditions can consist of one or more triggering conditions.

[0050] In addition, to evaluate the CHO execution conditions of candidate cells, two or more different triggers can be set at the same time, such as RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), SINR (Signal-to-Interference plus Noise power Ratio), etc.

[0051] Furthermore, if a Conventional Handover Notice (CHO) is configured for UE 200, and UE 200 receives another handover (HO) command from the gNB before the CHO execution conditions are met, UE 200 can trigger a handover based on the received HO command without waiting for the CHO conditions to be met. In other words, conventional HO configuration can take precedence over CHO configuration (if CHO is configured).

[0052] In addition, in the wireless communication system 10, in addition to the mobility management of the UE 200 based on layer 3 (e.g., which may include the radio resource control layer (RRC)) (also referred to as L3 mobility), mobility management in layer 1 / layer 2 (e.g., which may include the media access control layer (MAC)) (also referred to as LTM or L1 / L2 mobility) can also be applied.

[0053] L3 Mobility can be interpreted as mobility control in the Radio Resource Control (RRC) layer. On the other hand, LTM can also be interpreted as mobility control in the Physical Layer (PHY), Medium Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol (PDCP) layer.

[0054] In addition, in UE-based LTM, similar to Conditional Handover (CHO), the UE can monitor the state according to the execution condition after receiving a specific execution condition from the gNB, and execute LTM when the execution condition is met.

[0055] In a broad sense, the mobility of UE 200 can refer to the ease of movement and maneuverability of UE 200. In this embodiment, it can also refer to the minimization of call drop, radio link (including beam) failure, unnecessary handover, ping-pong state, etc.

[0056] In the wireless communication system 10, an SSB (SS / PBCH Block) consisting of a synchronization signal (SS) and a downlink physical broadcast channel (PBCH) can be used.

[0057] The SSB is primarily transmitted periodically from the network for UE 200 to perform cell ID and receive timing checks at the start of communication. In NR, the SSB is also used for receiving quality measurements in each cell. The transmission period of the SSB can be specified as 5, 10, 20, 40, 80, 160 milliseconds, etc. Furthermore, the initial access period for UE 200 can be assumed to be 20 milliseconds.

[0058] UE 200 sends a measurement report (hereinafter referred to as Measurement report) to the network containing cell-related reception quality information, including the serving cell and neighboring cells. The process of UE 200 sending the Measurement report can also be called Measurement reporting. Cell-related reception quality information may include reception quality from the cell's beam or cell-based reception quality based on the cell's beam.

[0059] UE 200 can also perform measurement reporting periodically. UE 200 can also perform measurement reporting on an event-by-event basis. The entry conditions for starting measurement reporting and the exit conditions for ending measurement reporting can be specified on an event-by-event basis. Existing events can include the events shown below (refer to 3GPP TS38.331).

[0060] (i) Event A1

[0061] Event A1 is an event where the reception quality of the serving cell is better than a threshold. For example, the entry condition is Ms-Hys>Thresh, and the exit condition is Ms+Hys<Thresh.

[0062] Here, Ms is the reception quality of the serving cell, Hys is the hysteresis parameter, and Thresh is the threshold.

[0063] (ii) Event A2

[0064] Event A2 is an event where the reception quality of the serving cell is worse than a threshold. For example, the entry condition is Ms+Hys<Thresh, and the exit condition is Ms-Hys>Thresh.

[0065] Here, Ms is the reception quality of the serving cell, Hys is the hysteresis parameter, and Thresh is the threshold.

[0066] (iii) Event A3

[0067] Event A3 is an event where the reception quality of a neighboring cell is better than that of the serving cell by an offset. For example, the entry condition is Mn+Ofn+Ocn-Hys>Mp+Ofp+Ocp+Off, and the exit condition is Mn+Ofn+Ocn+Hys<Mp+Ofp+Ocp+Off.

[0068] Here, Mn is the reception quality of the neighboring cell, Ofn is the inherent offset of the measurement object, and Ocn is the inherent offset of the cell. Mp is the reception quality of the serving cell, Ofp is the inherent offset of the measurement object, and Ocp is the inherent offset of the cell. Hys is the hysteresis parameter, and Off is the parameter used in Event A3.

[0069] (iv) Event A4

[0070] Event A4 is an event where the reception quality of a neighboring cell is better than a threshold. For example, the entry condition is Mn+Ofn+Ocn-Hys>Thresh, and the exit condition is Mn+Ofn+Ocn+Hys<Thresh.

[0071] Here, Mn is the reception quality of the neighboring cell, Ofn is the inherent offset of the measurement object, and Ocn is the inherent offset of the cell. Hys is the hysteresis parameter, and Thresh is the threshold.

[0072] (v) Event A5

[0073] Event A5 is an event where the reception quality of the serving cell is worse than a threshold, while the reception quality of neighboring cells is better than a threshold. For example, the entry condition is Mp+Hys<Thresh1 and Mn+Ofn+Ocn-Hys>Thresh2, and the exit condition is Mp-Hys>Thresh1 and Mn+Ofn+Ocn+Hys<Thresh2.

[0074] Here, Ms represents the reception quality of the serving cell, Hys is the hysteresis parameter, and Thresh1 is the threshold. Mn represents the reception quality of the neighboring cells, Ofn is the inherent offset of the measurement object, and Ocn is the inherent offset of the cell. Hys is the hysteresis parameter, and Thresh2 is the threshold.

[0075] (vi) Event A6

[0076] Event A6 is an event in which the reception quality of a neighboring cell is better than that of the SCell (Secondary Cell) by an offset. For example, the entry condition is Mn+Ocn-Hys>Ms+Ocs+Off, and the exit condition is Mn+Ocn+Hys<Ms+Ocs+Off.

[0077] In addition to the events mentioned above, events related to RAT (Radio Access technology) may also be included (e.g., B1 (Inter RAT neighbour becomes better than threshold: Inter RAT neighbour becomes better than threshold), B2 (Serving becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2: Serving becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2)).

[0078] Here, Mn is the reception quality of the neighboring cell, and Ocn is the cell-inherent offset. Ms is the reception quality of the SCell, and Ocs is the cell-inherent offset. Hys is the hysteresis parameter, and Off is the parameter used in Event A6.

[0079] In addition, the wireless communication system 10 can incorporate technologies for reducing network energy consumption (NES: Network Energy Saving). There are no particular limitations on NES-based energy consumption reduction methods; typically, these may include cell migration to a dormant state, migrating cells formed by gNBs to a dormant state, and intermittently performing DTX / DRX (Discontinuous Transmission / Discontinuous Reception) based on gNB 100.

[0080] A cell's dormant state can refer to a state where at least one of downlink (DL) transmission and uplink (UL) reception is not performed for a certain period of time. Alternatively, it can be interpreted as follows: in DTX state, DL transmission based on gNB100 is performed discontinuously at certain intervals; in DRX state, UL reception based on gNB100 is performed discontinuously at certain intervals. DTX / DRX can be activated or deactivated using Downlink Control Information (DCI).

[0081] It can also be interpreted as the cell's dormant state and DTX / DRX state. Additionally, NES can also be applied to CHO and LTM scenarios.

[0082] (2) Functional block structure of wireless communication system

[0083] Next, the functional block structure of the wireless communication system 10 will be described. Specifically, the functional block structure of the UE 200 will be described. Figure 3 This is the function block structure diagram of gNB 100 and UE 200.

[0084] like Figure 3 As shown, the UE 200 includes a wireless signal transceiver unit 210, an amplifier unit 220, a modem unit 230, and a control signal transceiver unit 200. The reference signal processing unit 240, the encoding / decoding unit 250, the data transceiver unit 260, and the control unit 270 are included.

[0085] In addition, it is important to note that in Figure 3Only the main functional blocks associated with the implementation description are shown in the diagram; the UE 200 (gNB 100) has other functional blocks (e.g., power supply section, etc.). Additionally, Figure 3 This shows the functional block structure of UE 200. For information on the hardware structure, please refer to [link / reference]. Figure 7 .

[0086] The wireless transceiver unit 210 transmits and receives wireless signals that comply with NR. The wireless transceiver unit 210 can support Massive MIMO, which generates more directional beams by controlling wireless (RF) signals transmitted from multiple antenna elements, carrier aggregation (CA) that uses multiple component carriers (CC), and dual connectivity (DC) that enables simultaneous communication between the UE and two NG-RAN nodes.

[0087] The amplification unit 220 is composed of a power amplifier (PA) and a low-noise amplifier (LNA). The amplification unit 220 amplifies the signal output from the modem 230 to a predetermined power level. Additionally, the amplification unit 220 amplifies the RF signal output from the wireless transceiver unit 210.

[0088] The modem 230 performs data modulation / demodulation, transmit power setting, and resource block allocation for each predetermined communication target (gNB 100, etc.). Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-Spread OFDM (DFT-S-OFDM) can also be applied in the modem 230. Furthermore, DFT-S-OFDM can be used not only for the uplink (UL) but also for the downlink (DL).

[0089] The control signal and reference signal processing unit 240 performs processing related to various control signals transmitted and received by the UE 200, as well as processing related to various reference signals transmitted and received by the UE 200.

[0090] Specifically, the control signal / reference signal processing unit 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, such as control signals from the Radio Resource Control (RRC) layer. Additionally, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100 via the predetermined control channel.

[0091] control signals The reference signal processing unit 240 performs processing using reference signals (RS) such as the demodulation reference signal (DMRS) and the tracking reference signal (TRS).

[0092] DMRS is a terminal-specific, known reference signal (pilot signal) used to estimate the fading channel used for data demodulation between the base station and the terminal. TRS is a reference signal used to track time and frequency variations in the downlink.

[0093] In addition to DMRS and TRS, the reference signal may also include Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS) for location information.

[0094] In addition, channels include control channels and data channels. Control channels may include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, including Downlink Control Information (DCI) containing Random Access Radio Network Temporary Identifier (RA-RNTI)), and Physical Broadcast Channel (PBCH), etc.

[0095] In addition, data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data can refer to data transmitted via data channels.

[0096] In addition, control signals The reference signal processing unit 240 can perform processing related to the transmission and reception of messages and commands associated with CHO, LTM, and NES. Specifically, control signals... The reference signal processing unit 240 can receive a message from the network containing an execution condition for cell handover following LTM. In this embodiment, the control signal... The reference signal processing unit 240 can be configured as a receiving unit.

[0097] More specifically, control signals Reference signal processing unit 240 can receive from the network (gNB 100) an RRC Reconfiguration containing at least one of the execution condition associated with not applying NES (also known as normal LTM execution condition) and the execution condition associated with applying NES (also known as NES execution condition).

[0098] NES execution condition can be interpreted as the pausing execution condition applied when the source cell of the migration source or the candidate cell of the migration destination is transferred to a pausing state according to NES. Control signals The reference signal processing unit 240 is able to receive a message containing such a pause execution condition.

[0099] control signals The reference signal processing unit 240 can also receive lower-layer messages indicating a transition to a quiescent state to the NES-compliant cell (gNB 100). For example, control signals. The reference signal processing unit 240 can receive Layer 1 signaling (which may include DCI) or MAC-CE (Control Element) indicating that the source cell (which may include the target cell) is transitioning to the rest state.

[0100] In addition, control signals The reference signal processing unit 240 can also receive a cell handover command containing information indicating a transition to the cessation state. Specifically, control signals The reference signal processing unit 240 can receive a cell switch command containing an NES mode activation trigger from the gNB 100. In this case, the control signal... The reference signal processing unit 240 can report in advance to the gNB 100 that the triggering conditions (which can be interpreted as events) for L1 measurement according to NES have been met through L1 measurement reporting.

[0101] control signals The reference signal processing unit 240 can receive an RRC reconfiguration that includes the settings of candidate cells (which may include cells that are NES targets). In this case, considering cells that are NES targets, the information elements (IEs) constituting the RRC reconfiguration can include, separately from the information elements indicating whether the candidate cell is in a dormant state (additional information elements), information elements indicating whether the candidate cell is in a dormant state. Control signal The reference signal processing unit 240 can receive RRCReconfiguration which includes additional information elements (NES cell or non-NES cell) indicating whether such candidate cells are in a dormant state.

[0102] control signals The reference signal processing unit 240 can receive a UE Information Request from the network. Additionally, control signals... The reference signal processing unit 240 can send terminal information (UE Information Response) containing cell-related information to the network based on the radio link and handover status in a cell in the NES pause state (also referred to as an NES cell). In this embodiment, the control signal The reference signal processing unit 240 can be configured as a transmitting unit.

[0103] Specifically, control signals The reference signal processing unit 240 can send a UE InformationResponse to the gNB 100 indicating the status of the NES cell in the event of a radio link failure (RLF) or handover failure (HOF).

[0104] More specifically, in the event of a Radio Link Failure (RLF), the transmitting unit may send a UEInformationResponse containing at least one of the following: an indication that the cell is in a suspended state, the type of suspended state, cell identification information, the form of discontinuous transmission / discontinuous reception (DTX / DRX) of the cell, terminal location information, and information about the time of the failure. Furthermore, the time of failure may be the moment when the UE 200 detects the RLF, or it may include the duration of the RLF, the time of RLF recovery, etc.

[0105] In addition, control signals In the event of a handover failure (HOF), the reference signal processing unit 240 may send a UEInformationResponse containing at least one of the following: identification information of the source cell of the handover source, identification information of the target cell of the handover destination, reception quality (RSRP, RSRQ, SINR) of the source cell, reception quality of the target cell, indication that the source cell is in a quiescent state, indication that the target cell is in a quiescent state, indication that the candidate cell of the handover destination is in a quiescent state, the form of discontinuous transmission / discontinuous reception (DTX / DRX) of the source cell, the form of discontinuous transmission / discontinuous reception of the target cell, the location information of the UE 200, and the time information of the failure occurrence.

[0106] When sending such a UEInformationResponse, the control signal The reference signal processing unit 240 may include at least one of a measurement offset and a hysteresis parameter associated with the resting state. That is, the control signal... The reference signal processing unit 240 can send a UEInformationResponse containing the offset and hysteresis parameters applied during NES, as the offset (O) and hysteresis parameters (Hys) of the event applied to the aforementioned Measurement reporting.

[0107] Furthermore, the network can configure measurement reporting that enables the UE to report measurement results for each SS / PBCH block. The network can configure measurement reporting that enables the UE to report measurement results for each SS / PBCH block, or it can configure measurement reporting that enables the UE to report measurement results for each cell based on SS / PBCH blocks. The network can also configure measurement reporting that enables the UE to report measurement results for each CSI-RS resource, or it can configure measurement reporting that enables the UE to report measurement results for each cell based on CSI-RS resources.

[0108] In addition, control signals The reference signal processing unit 240 may also send a UEInformationResponse containing at least one of the following: identification information of the cell associated with the cell migration of the UE 200 based on CHO or LTM, and an indication that the associated cell is in a suspended state. Furthermore, LTM may also include LTM fast failure recovery. LTM fast failure recovery is a mechanism whereby, in the event of an LTM failure, the UE 200 performs cell selection; if the selected cell is an LTM candidate cell, it directly applies the settings of the candidate cell without sending an RRCReestablishmentRequest to the gNB 100.

[0109] Additionally, when sending such a UEInformationResponse, the control signal The reference signal processing unit 240 can send a UEInformationResponse containing an indication of migration from the cell to a resting state (NES mode activation trigger) and the time from the start, completion, or failure of the handover.

[0110] Specifically, control signals The reference signal processing unit 240 may also send a UEInformationResponse containing the time required from receiving the NES mode activation trigger from the source cell side to the handover success or failure, and the time from receiving the NES mode activation trigger from the source cell side to performing the handover (whether successful or failure).

[0111] control signals The reference signal processing unit 240 can send capability information of the UE 200 to the network. For example, control signals. The reference signal processing unit 240 can send UE capability information related to the triggering conditions of the measurement report and support associated with NES to the gNB 100.

[0112] In addition, control signals The reference signal processing unit 240 can also receive lower-layer signaling when the subcell transitions to a non-essential energy storage (NES) mode accompanied by reduced power consumption. In this embodiment, the control signal... The reference signal processing unit 240 can also be configured as a receiving unit for receiving lower-level signaling.

[0113] The encoding / decoding unit 250 performs data segmentation / linking and channel encoding / decoding for each predetermined communication target (gNB 100 or other gNB).

[0114] Specifically, the encoding / decoding unit 250 divides the data output from the data transceiver unit 260 into predetermined sizes and performs channel coding on the divided data. Additionally, the encoding / decoding unit 250 decodes the data output from the modem unit 230 and concatenates the decoded data.

[0115] The data transceiver unit 260 performs the transmission and reception of Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transceiver unit 260 performs the assembly / disassembly of PDUs / SDUs at multiple layers (Media Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol (PDCP), etc.). In addition, the data transceiver unit 260 performs error correction and retransmission control based on Hybrid Automatic Repeat Request (HARQ).

[0116] The control unit 270 controls the functional blocks that constitute the UE 200. In particular, in this embodiment, the control unit 270 performs controls related to CHO, LTM, and NES.

[0117] Specifically, the control unit 270 controls the cell migration (handover) of the UE 200 according to LTM (Low-Layer Mobility Control). Additionally, the control unit 270 controls the cell migration (handover) according to Conditional Handover (CHO). Both LTM and CHO can apply an execution condition to determine whether to perform a cell migration (handover).

[0118] LTM can be interpreted as cell migration based on processing in the lower layers (L1 / L2) as described above, while CHO can be interpreted as cell migration based on processing in the higher layers (L3).

[0119] The control unit 270 can perform cell migration if the execution condition (pause execution condition) applied when transferring from the source cell of the migration source or the candidate cell of the migration destination to the pause state according to NES is met. This execution condition can be used for LTM or CHO. As mentioned above, an inherent measurement offset or hysteresis parameter different from that of the usual LTM (CHO) can also be applied to this execution condition.

[0120] In other words, the control unit 270 can perform cell migration if at least one of the inherent measurement offset and inherent measurement hysteresis parameters associated with the pause state of the NES-based cell (as described above, which may include DTX / DRX state) is satisfied.

[0121] Control unit 270 can satisfy control signals When the pause execution condition is received by the reference signal processing unit 240, cell migration (handover) is performed according to LTM (or CHO). Furthermore, the pause execution condition may not necessarily be sent from the network, but may be pre-configured by the UE 200.

[0122] In addition, the control unit 270 can also control signals When the reference signal processing unit 240 receives a lower-layer message indicating a transition to a pause state according to NES, and the pause execution conditions are met, it performs cell migration. As described above, the lower-layer message can be Layer 1 signaling or MAC-CE.

[0123] Alternatively, the control unit 270 may perform cell migration based on a cell handover command. Specifically, the control unit 270 may perform cell migration based on a cell switch command that includes an NES mode activation trigger.

[0124] To determine whether a cell is in a suspended state according to NES, the control unit 270 can refer to the additional information element (NES cell or Non-NES cell) included in the candidate cell configuration. That is, the control unit 270 can refer to this additional information element to determine whether the candidate cell is in a suspended state. If the control unit 270 only refers to this additional information element, it can quickly determine whether the candidate cell is in a suspended state without referring to (decoding) the candidate cell configuration.

[0125] In addition, the control unit 270 can also control signals When the reference signal processing unit 240 receives a lower-level signaling message indicating that gNB 100 (or the cell) is transferring to NES mode, it deletes or deactivates the secondary cell. The control unit 270 may also begin monitoring the execution conditions for deleting or changing the secondary cell upon receiving this signaling message.

[0126] In addition, the gNB 100 can have the following functions. Specifically, the gNB 100 can have: control signals. The reference signal processing unit 240 (receiving unit) receives a measurement report from the UE 200; and the control unit 270 sets multiple candidate sub-cells that the UE 200 can autonomously select based on the measurement report.

[0127] The control unit 270 of gNB 100 can set the execution conditions for adding, deleting, or changing sub-cells.

[0128] Additionally, gNB 100 may include: a wireless transceiver unit 210 (communication unit) that performs wireless communication with UE 200 via a secondary cell; and a control unit 270 that sets the priority for a secondary cell when setting candidates for a secondary cell.

[0129] The control unit 270 of gNB 100 can set priorities based on at least one of the energy consumption cost in the sub-cell, the required communication quality, and the capabilities of UE 200.

[0130] In addition, the control unit 270 of gNB 100 can also set a priority for each candidate of the sub-cell when applying at least one of conditional handover (CHO), conditional cell change (CPC), and low-layer mobility control (LTM).

[0131] In addition, the control unit 270 of gNB 100 can also set priorities based on at least one of the congestion level of the sub-cell and whether or not it is in a resting state.

[0132] (3) Operation of wireless communication system

[0133] Next, the operation of the wireless communication system 10 will be explained. Specifically, examples of operations related to the addition, modification, or deletion of subcells in the case of NES application will be explained.

[0134] (3.1) Example of action 1

[0135] Figure 4 This illustrates a structure example of a primary and secondary cell. In the existing SCell change process, based on the measurement report from the UE, SCell addition and SCell release are sent from the gNB via RRC signaling for the UE. That is, the UE cannot change the SCell independently.

[0136] Figure 5 This example illustrates the timing sequence for configuring the SCell involved in Action Example 1. In this action example, the gNB can pre-configure multiple candidate SCell(s) for the UE based on the measurement report from the UE.

[0137] The gNB can configure the UE to autonomously delete or deactivate the execution condition of the SCell. This execution condition can be that the quality of the SCell is below a predetermined threshold.

[0138] The gNB can configure and automatically add or activate the execution condition of the SCell for the UE. This execution condition can be that the quality of the SCell is higher than a predetermined threshold.

[0139] The gNB can configure changes to or add execution conditions to the SCell for the UE. This execution condition can be the offset by which the quality of the neighboring cell is higher than the quality of the SCell.

[0140] In addition, the UE can monitor the above-mentioned execution condition. If the execution condition is met, it can perform autonomous deletion, activation, or change of the SCell.

[0141] The UE can also maintain a list of candidate SCells and execution conditions for further SCell deletion (deactivation), SCell appending (activation), and SCell changes.

[0142] When the UE receives a change to the candidate SCell list or an RRC signaling for the change from the gNB, it can change or delete the listed candidate SCells.

[0143] According to this example, the gNB can pre-configure multiple candidate SCell(s) for the UE based on the measurement report from the UE, and configure execution conditions for the UE to autonomously delete or deactivate SCells. Therefore, even when NES is applied, the UE can autonomously add, modify, or delete appropriate SCells. Thus, even when NES is implemented, appropriate cell changes can be achieved.

[0144] (3.2) Action Example 2

[0145] When an SCell is an NES cell, and its NES mode is activated, normal UEs belonging to that cell are preferentially migrated to other normal SCells. However, in existing 3GPP specifications, the following procedure is required: the NES mode SCell is deleted via RRC signaling from the gNB, and another normal SCell is added. That is, the UE cannot independently change its NES SCell to another normal SCell.

[0146] In addition, NES mode can refer to achieving energy reduction by migrating the cell to a dormant state or a DTX / DRX state, changing it to an SSB-less cell, or changing it to a cell that does not broadcast SIB (System Information).

[0147] Furthermore, when the primary and secondary cells (PSCells) in dual connectivity are NES cells, when the NES mode of that PSCell is activated, normal UEs belonging to that cell are preferentially changed (migrated) to other normal PSCells. In this case, although conditional PSCell addition change (CPAC) can be performed, it is not possible to develop specific methods that take into account NES cells.

[0148] (3.2.1) Action Example 2-1

[0149] When a UE receives L1 group signaling that migrates to NES mode (e.g., cell DTX / DRX) within a SCell, it can autonomously delete (or deactivate) the SCell.

[0150] Figure 6 This shows an example of the SCell setup timing involved in action example 2. For example... Figure 6 As shown, upon receiving L1 group signaling indicating a migration to NES mode (e.g., cell DTX / DRX) within a SCell, the UE, similar to Action Example 1, can begin monitoring the execution conditions for SCell delete (deactivation) and SCell change. If the execution condition is met, the UE can perform SCell delete (deactivation) / SCell change.

[0151] When a UE receives L1 group signaling that migrates to NES mode (e.g., cell DTX / DRX) within a SCell, and when the execution conditions for SCell delete (deactivation) and SCellchange are met as in Action Example 1, it can execute SCell delete (deactivation) / SCellchange.

[0152] In addition to L1 group signaling for migrating to NES mode (e.g., cell DTX / DRX) within a SCell, MAC CE indicating NES mode activation can be used, as well as RRC signaling.

[0153] (3.2.2) Action Example 2-2

[0154] The execution condition of CPAC can include NES-specific hysteresis, NES-specific offset, or NES-specific timeToTrigger. The NES-specific offset can be per cell or per measObject / frequecncy.

[0155] In addition, the execution condition of CPAC can refer to condEventA3, condEventA4, and condEventA5 as conditional events (see 3GPP TS38.331).

[0156] For example, if the source PSCell is an NES cell, a PSCell change can be easily performed by setting a low NES offset value. Alternatively, if the candidate target cell is an NES cell, a high NES offset value can be set to make it more difficult to perform a PSCell change compared to other normal candidate cells.

[0157] As the execution condition for CPAC, the normal execution condition and the NES execution condition can be pre-configured via RRC. The normal execution condition is used by default (unless otherwise specified by gNB).

[0158] Alternatively, NES execution condition can be used by default. Alternatively, an indication to switch from normal execution condition to NES execution condition can be sent to the UE from the source gNB / PSCell via L1 group signaling, L1 signaling, or MAC CE.

[0159] The UE that receives this instruction can apply the parameters of the NES execution condition (e.g., hysteresis, offset, timeToTrigger used by NES) to monitor the execution condition.

[0160] The UE can trigger CPAC if it receives L1 group signaling or MACCE (e.g., containing NES mode activation trigger) from the source PSCell and meets the execution condition (e.g., the quality of the neighbor cell becomes better than the quality of the serving cell).

[0161] In addition, the UE can start monitoring the execution condition in response to receiving L1 group signaling or MAC CE from the source PSCell.

[0162] According to this example, the UE performs autonomous deletion of SCells based on signaling from the network. Therefore, even when NES is applied, the UE can autonomously perform appropriate addition, modification, or deletion of SCells. Thus, even when NES is implemented, appropriate cell changes can be achieved.

[0163] (3.3) Action Example 3

[0164] In existing 3GPP specifications, when a UE autonomously adds / changes a SCell, the decision to add / change is based solely on the cell's reception quality. That is, it is not possible to autonomously add / change SCells considering factors such as SCell congestion and NES cells.

[0165] Furthermore, when the UE performs CHO, CPAC, or LTM, it only monitors the quality of the candidate target cell to determine whether cell migration is necessary. It cannot perform CHO, CPAC, or LTM that take into account factors such as candidate target cell congestion and NES cells.

[0166] (3.3.1) Action Example 3-1

[0167] When configuring candidate SCells, the gNB can apply a weight or priority to each SCell. This weight / priority can also take into account factors such as cell congestion, NES cells, URLLC (Ultra-Reliable and Low Latency Communications) functionality, or redCap (Reduced UE Capability) functionality.

[0168] For example, in SCell#1 (refer to...) Figure 4 In crowded conditions, weight / priority can be set to "1". In less crowded conditions in SCell#2, weight / priority can be set to "2".

[0169] Here, if both SCell#1 and SCell#2 meet the quality conditions, SCell#2 can be prioritized for access. Alternatively, the congestion level of each SCell can be directly represented. For example, it can be represented as SCell#1: 70, SCell#2: 30, etc. (100 can refer to full capacity). The congestion level can also be the future congestion level predicted by an artificial intelligence / machine learning model (AI / ML Model).

[0170] Additionally, if the UE is a normal UE and SCell#1 is an NES cell, the weight / priority can be set to "1". SCell#2 can be set as a normal cell, and the weight / priority set to "2". In this case, if both SCell#1 and SCell#2 meet the quality conditions, access to SCell#2 can be prioritized. Alternatively, it can be directly indicated whether the SCell is an NES cell or a non-NES cell. The NES cell indication can be a predicted value, generated by AI / ML, indicating that the cell will migrate to NES mode at a specific future time.

[0171] Similar to the NES cell mentioned above, the weight / priority can also be determined based on whether the SCell supports URLLC, RedCap, etc., according to the UE's capabilities. Specifically, if the UE has URLLC capability and SCell#1 does not support URLLC, the weight / priority can be set to "1". If SCell#2 supports URLLC, the weight / priority can be set to "2". In this case, if both SCell#1 and SCell#2 meet the quality requirements, SCell#2 can be prioritized for access.

[0172] In addition, UEs can also prioritize accessing cells with high weight / priority (the same applies below).

[0173] (3.3.2) Action Example 3-2

[0174] In the case of CHO, CPC, or LTM, when configuring a candidate target cell in Gnb, a weight / priority can be assigned to each candidate target cell.

[0175] The weight / priority can take into account factors such as crowding or NES cell density.

[0176] For example, if candidate target cell #1 is crowded, weight / priority can be set to "1". If candidate target cell #2 is less crowded, weight / priority can be set to "2".

[0177] In this scenario, provided the quality conditions of both candidate target cell #1 and candidate target cell #2 are met, access to candidate target cell #2 can be prioritized. Alternatively, congestion can be directly represented for each candidate target cell. For example, it can be expressed as Candidate target cell #1: 70, candidate target cell #2: 30, etc. (100 can refer to full capacity). Congestion can also be the future congestion predicted by AI / ML. UEs can also prioritize accessing idle cells.

[0178] Additionally, if candidate target cell #1 is an NES cell, the weight / priority can be set to "1". If candidate target cell #2 is a normal cell, the weight / priority can be set to "2".

[0179] In this scenario, if both candidate target cell #1 and candidate target cell #2 meet the quality requirements, candidate target cell #2 can be prioritized for access. Alternatively, the SCell can be directly indicated as an NES cell or a non-NES cell. The NES cell indication can be a predicted value, generated by AI / ML, indicating that the cell will migrate to NES mode at a specific future time. The UE can prioritize accessing a non-NES cell.

[0180] Similar to the NES cell mentioned above, the weight / priority can also be determined based on whether the SCell supports URLLC, RedCap, etc., according to the UE's capabilities. Specifically, if the UE has URLLC capability and candidate target cell #1 does not support URLLC, the weight / priority can be set to "1". If candidate target cell #2 supports URLLC, the weight / priority can be set to "2". In this case, if both candidate target cell #1 and candidate target cell #2 meet the quality requirements, candidate target cell #2 can be prioritized for access.

[0181] According to this action example, weights or priorities are applied to SCells or candidate target cells based on factors such as congestion or NES cells. Therefore, even when NES is applied, the UE can autonomously perform appropriate additions, changes, or deletions of SCells. Thus, even when NES is implemented, appropriate cell changes can be achieved.

[0182] (4) Other implementation methods

[0183] The content of this proposal has been described above according to the embodiments, but this proposal is not limited to these descriptions and various modifications and improvements can be made, which will be obvious to those skilled in the art.

[0184] The above describes the implementation methods, but the present invention is not limited to the description of these implementation methods. Various modifications and improvements can be made, which will be obvious to those skilled in the art.

[0185] For example, the name NES was used in the above implementation, but the technology for reducing network energy consumption as described above can also use other names with the same meaning.

[0186] Furthermore, in the above description, the terms configure, activate, update, indicate, enable, specify, and select can be interchanged. Similarly, the terms link, associate, correspond, and map can be interchanged, as can allocate, assign, monitor, and map.

[0187] Furthermore, specific, dedicated, UE specific, and UE dedicated can be used interchangeably. Similarly, common, shared, group-common, UE common, and UE shared can also be used interchangeably.

[0188] In this disclosure, the terms "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "transmission configuration indication state (TCI state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beamwidth", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0189] In addition, the block structure diagram used in the description of the above embodiments ( Figure 3 The diagram illustrates blocks organized by function. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Furthermore, there are no particular limitations on the implementation method of each functional block. That is, each functional block can be implemented using a single device that is physically or logically combined, or by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. Functional blocks can also be implemented by combining software within the aforementioned single or multiple devices.

[0190] The functions include judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, the functional block (structural part) that performs the sending function is called the transmitting unit or transmitter. In short, as mentioned above, there are no particular limitations on the implementation method.

[0191] Furthermore, the aforementioned gNB 100 and UE 200 (the device) can also function as a computer for processing the wireless communication method disclosed herein. Figure 7 This is a diagram illustrating an example of the hardware structure of the device. (As shown...) Figure 7 As shown, the device can also be configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0192] Furthermore, in the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of the device can be configured as either a device comprising one or more of the illustrated components, or a device without any components.

[0193] The functional blocks of the device (refer to) Figure 3 This can be achieved through any hardware element or combination of hardware elements in the computer device.

[0194] In addition, the functions of the device are implemented by reading predetermined software (programs) into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls communication of communication device 1004 or controls at least one of reading and writing data in memory 1002 and storage device 1003.

[0195] The processor 1001 controls the computer as a whole by instructing the operating system to operate. The processor 1001 may also be a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc.

[0196] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one direction of memory 1002 in the storage device 1003 and the communication device 1004, and performs various processes accordingly. The program is used to cause the computer to perform at least a portion of the actions described in the above embodiments. Moreover, the various processes described above can be executed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 can also be implemented using one or more chips. Furthermore, the program can also be transmitted from a network via a telecommunications line.

[0197] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of the following: read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), and random access memory (RAM). The memory 1002 may be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 may store programs (program code), software modules, etc., capable of executing the methods according to an embodiment of this disclosure.

[0198] Storage device 1003 is a computer-readable recording medium, and may be composed of at least one of the following: optical discs such as CD-ROM (Compact Disc ROM), hard disk drives, floppy disks, magneto-optical discs (e.g., compact discs, digital multipurpose discs, Blu-ray discs), smart cards, flash memory (e.g., cards, sticks, key drives), floppy disks, magnetic stripes, etc. Storage device 1003 may also be referred to as an auxiliary storage device. The aforementioned recording medium may, for example, be a database, server, or other suitable media that includes at least one of memory 1002 and storage device 1003.

[0199] The communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network. For example, it may also be called a network device, network controller, network card, communication module, etc.

[0200] The communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0201] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Furthermore, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0202] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 can be configured using a single bus or different buses can be used between each device.

[0203] Furthermore, the device can be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field-programmable gate array (FPGA), which can be used to implement some or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0204] Furthermore, the notification of information is not limited to the forms / implementations described in this disclosure, and other methods may also be used. For example, information notification may be implemented through physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or combinations thereof. Additionally, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0205] The various forms / implementations described in this disclosure can also be applied to systems utilizing LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (x being, for example, an integer or a decimal), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The system may include at least one of 802.20, Ultra-Wideband (UWB), Bluetooth (registered trademark), other suitable systems, and next-generation systems based on these systems. Alternatively, multiple systems may be combined (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) for application.

[0206] The processing procedures, timing, and flow of the various forms / implementations described in this disclosure may be changed in order, provided there is no contradiction. For example, the elements of various steps are indicated using an illustrative order in the methods described in this disclosure, but are not limited to the specific order indicated.

[0207] In this disclosure, certain actions performed by the base station are sometimes also performed by its upper node, depending on the circumstances. In a network consisting of one or more network nodes having a base station, it is obvious that various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes besides the base station (e.g., considering an MME or S-GW, but not limited to these). The above illustration depicts a case where there is only one other network node besides the base station, but it can also be a combination of multiple other network nodes (e.g., an MME and an S-GW).

[0208] It can output information and signals (information, etc.) from a higher (or lower) level to a lower (or higher) level. It can also be input or output through multiple network nodes.

[0209] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0210] The determination can be made by the value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparing numerical values ​​(e.g., comparing with a predetermined value).

[0211] The various forms / implementations described in this disclosure can be used individually or in combination, and can be switched depending on the execution. Furthermore, the notification of predetermined information (e.g., a "It is X" notification) is not limited to being explicit, but can also be implicit (e.g., not notifying the predetermined information).

[0212] Software, whether called software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted as referring to commands, command sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0213] In addition, software, commands, information, etc., can be sent and received via a transmission medium. For example, when software is sent from a webpage, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0214] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc., that may be involved in the above description as a whole can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0215] Furthermore, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms that have the same or similar meanings. For example, at least one of the channel and symbol may also be a signal (signaling). Additionally, a signal may also be a message. Furthermore, a component carrier (CC) may also be referred to as carrier frequency, cell, frequency carrier, etc.

[0216] The terms “system” and “network” as used in this disclosure are used interchangeably.

[0217] Furthermore, the information, parameters, etc., described in this disclosure can be represented using absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources can be indicated using indexes.

[0218] The names used for the parameters described above are non-limiting in any respect. Furthermore, the formulas, etc., using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any appropriate name, and therefore the various names assigned to these channels and information elements are non-limiting in any respect.

[0219] In this disclosure, the terms "Base Station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. Sometimes, terms such as macro cell, small cell, femtocell, and picocell are also used to refer to base stations.

[0220] A base station can accommodate one or more (e.g., 3) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through the base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0221] Terms such as “cell” or “sector” refer to a portion or the entire coverage area of ​​at least one of the base stations and base station subsystems that provide communication services within that coverage area.

[0222] In this disclosure, the base station sending information to the terminal can also be replaced by the base station instructing the terminal on information-based control / actions.

[0223] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" are used interchangeably.

[0224] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, client, or some other appropriate terms.

[0225] At least one of the base station and mobile station can also be referred to as a transmitting device, receiving device, communication device, etc. Furthermore, at least one of the base station and mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object with an arbitrary speed of movement. It also includes situations where the mobile body is stationary. Examples of mobile bodies include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, rear cars, rickshaws, ships (ships and other watercraft), airplanes, rockets, artificial satellites, Drone (registered trademark), multi-rotor helicopters, quadcopter helicopters, balloons, and objects mounted on them. Additionally, the mobile body can also be a mobile body that moves autonomously based on operating commands. It can be a means of transportation (e.g., car, airplane), a mobile body that moves unmanned (e.g., drone, autonomous vehicle), or a robot (humanized or unmanned). Furthermore, at least one of the base station and mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station can be an IoT (Internet of Things) device such as a sensor.

[0226] Furthermore, the base station in this disclosure can also be replaced by a mobile station (user terminal, hereinafter the same). For example, various forms / implementations of this disclosure can also be applied to structures that replace communication between the base station and the mobile station with communication between multiple mobile stations (e.g., also referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the structure can also be configured such that the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" can also be replaced with terms corresponding to communication between terminals (e.g., "side"). For example, uplink channel, downlink channel, etc. can also be replaced with side channel (or side link).

[0227] Similarly, the mobile station in this disclosure can be replaced by a base station. In this case, the base station can also be configured to have the functions of a mobile station.

[0228] A radio frame can consist of one or more frames in the time domain. In the time domain, one or more frames can be called subframes. A subframe can also consist of one or more time slots in the time domain. A subframe can be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0229] A parameter set can be communication parameters applied to at least one of the transmission and reception of a signal or channel. For example, a parameter set can represent at least one of the following: Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, and specific windowing processing performed by the transceiver in the time domain.

[0230] In the time domain, a time slot can be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A time slot can be a time unit based on a set of parameters.

[0231] A time slot can contain multiple mini-time slots. Each mini-time slot can consist of one or more symbols in the time domain. Additionally, a mini-time slot can also be called a sub-time slot. A mini-time slot can consist of fewer symbols than a time slot. PDSCH (or PUSCH) transmitted in time units larger than mini-time slots can be called PDSCH (or PUSCH) mapping type (type) A. PDSCH (or PUSCH) transmitted using mini-time slots can be called PDSCH (or PUSCH) mapping type (type) B.

[0232] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can each be referred to by other corresponding names.

[0233] For example, a single subframe can be called a Transmission Time Interval (TTI), multiple consecutive subframes can also be called a TTI, and a single time slot or a single mini-time slot can also be called a TTI. In other words, at least one of a subframe or TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing TTI can also be called a time slot, mini-time slot, etc., instead of a subframe.

[0234] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules the allocation of radio resources (bandwidth, transmit power, etc., available to each user terminal) in units of TTI. However, the definition of TTI is not limited to this.

[0235] The Time Interval (TTI) can be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., or it can be a processing unit such as scheduling or link adaptation. Furthermore, when a TTI is given, the actual time interval (e.g., the number of symbols) that the transmission block, code block, codeword, etc., are mapped to can be shorter than that TTI.

[0236] Furthermore, when one time slot or one mini time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can become the minimum time unit for scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit for scheduling can also be controlled.

[0237] A TTI with a duration of 1ms can also be called a normal TTI (TTI in LTE Rel.8-12), a long TTI, a normal subframe, a long subframe, or a time slot. A TTI shorter than a normal TTI can also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini time slot, a sub-time slot, or a time slot.

[0238] Furthermore, a long TTI (e.g., a typical TTI, a subframe, etc.) can be understood as a TTI with a duration of more than 1 ms, while a short TTI (e.g., a shortened TTI, etc.) can be understood as a TTI with a duration of less than a long TTI but more than 1 ms.

[0239] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers.

[0240] The number of subcarriers included in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers included in an RB can also be determined based on the parameter set.

[0241] In addition, the time domain of an RB can contain one or more symbols, which can be a time slot, a mini-time slot, a subframe, or a TTI in length. A TTI, a subframe, etc., can each be composed of one or more resource blocks.

[0242] In addition, one or more RBs can also be called Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0243] In addition, a resource block can consist of one or more resource elements (REs). For example, one RE can be a radio resource area consisting of one subcarrier and one symbol.

[0244] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) can represent a subset of contiguous common resource blocks (RBs) used for a certain parameter set in a given carrier. Here, common RBs can be determined by indexing RBs based on a common reference point of that carrier. PRBs can be defined and numbered within a BWP.

[0245] A BWP can include a UL BWP and a DL BWP. One or more BWPs can be set for a UE within a single carrier.

[0246] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive predetermined signals / channels outside of the active BWP. Furthermore, the terms "cell," "carrier," etc., used in this disclosure can be replaced with "BWP."

[0247] The structures of radio frames, subframes, time slots, mini-time slots, and symbols described above are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc., can be varied in many ways.

[0248] The terms “connected,” “coupled,” or any variations thereof are intended to indicate any direct or indirect connection or combination between two or more elements, including cases where there is one or more intermediate elements between the two elements that are “connected” or “coupled.” The combination or connection between elements can be physical, logical, or a combination of these. For example, “access” can be used instead of “connected.” In the context of this disclosure, it can be understood that two elements are “connected” or “coupled” to each other using at least one of one or more wires, cables, and printed electrical connections, and, as some non-limiting and non-inclusive examples, they are “connected” or “coupled” to each other using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, and light (both visible and invisible) region.

[0249] The reference signal can be simply called the Reference Signal (RS), or, depending on the standard applied, the pilot.

[0250] As used in this disclosure, the word "based on" does not mean "based on only" unless otherwise expressly stated. In other words, the word "based on" means both "based on only" and "based on at least".

[0251] Alternatively, the "unit" in the structure of the above devices can be replaced with "section", "circuit", "equipment", etc.

[0252] Any reference to elements using designations such as "first," "second," etc., as used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, references to "first" and "second" elements do not imply that only two elements can be used there, or that in some form the first element must precede the second element.

[0253] When the terms "include," "including," and their variations are used in this disclosure, these terms, like the term "comprising," imply inclusion. Furthermore, the term "or" as used in this disclosure does not refer to XOR.

[0254] In this disclosure, for example, in cases where articles are added through translation, such as in English (e.g., a, an, and the), this disclosure may also include cases where the noun following these articles is in a plural form.

[0255] The terms "determining" and "determining" as used in this disclosure sometimes encompass a variety of actions. For example, "determining" and "determining" may include actions such as judging, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), and ascertaining, which are considered as actions of "determining" and "determining." Furthermore, "determining" and "determining" may include actions such as receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, and accessing (e.g., accessing data in memory), which are considered as actions of "determining" and "determining." Additionally, "determining" and "determining" may include actions such as resolving, selecting, choosing, establishing, and comparing, which are considered as actions of "determining" and "determining." In other words, "judgment" and "decision" can include matters that are considered as having been "judged" or "decided". In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0256] In this disclosure, the phrase "A and B are different" can mean "A and B are not the same." Furthermore, this phrase can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0257] Figure 8 An example of the structure of vehicle 2001 is shown. For example... Figure 8 As shown, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a gear shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0258] The drive unit 2002 may consist of, for example, an engine, a motor, or a hybrid power system of an engine and a motor.

[0259] The steering unit 2003 includes at least a steering wheel (also called a steering wheel) configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0260] The electronic control unit 2010 consists of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (I / O port) 2033. Signals from various sensors 2021 to 2027 of the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 can also be referred to as an ECU (Electronic Control Unit).

[0261] The signals from various sensors 2021 to 2028 include current signals from current sensor 2021 that senses the current of the motor, speed signals of the front and rear wheels obtained by speed sensor 2022, air pressure signals of the front and rear wheels obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal input signals obtained by accelerator pedal sensor 2029, brake pedal input signals obtained by brake pedal sensor 2026, gear lever operation signals obtained by gear lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0262] The Information Service Unit 2012 consists of various devices such as a car navigation system, audio system, speakers, television, and radio, which provide (output) various information such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices. The Information Service Unit 2012 uses information obtained from external devices via communication modules 2013, etc., to provide various multimedia information and multimedia services to the occupants of vehicle 1.

[0263] The Information Services Department 2012 may include input devices that accept input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that implement output to external sources (e.g., monitor, speaker, LED light, touch panel, etc.).

[0264] The Driver Assistance System 2030 comprises various devices used to prevent accidents or reduce driver workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning devices (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyroscope systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. Furthermore, the Driver Assistance System 2030 transmits and receives various information via the communication module 2013 to achieve driver assistance or autonomous driving functions.

[0265] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 1 via the communication port. For example, the communication module 2013 can send and receive data with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gear shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, microprocessor 2031 in the electronic control unit 2010, memory (ROM, RAM) 2032, and sensors 2021 to 2028 in the vehicle 2001 via the communication port 2033.

[0266] The communication module 2013, controlled by the microprocessor 2031 of the electronic control unit 2010, is a communication device capable of communicating with external devices. For example, it can transmit and receive various types of information with external devices via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. External devices can be, for example, base stations, mobile stations, etc.

[0267] The communication module 2013 can wirelessly transmit to an external device at least one of the signals input to the electronic control unit 2010 from the various sensors 2021-2028, information obtained based on those signals, and information obtained via the information service unit 2012 based on input from an external source (user). The electronic control unit 2010, the various sensors 2021-2028, and the information service unit 2012 can also be referred to as input units that receive input. For example, the PUSCH transmitted by the communication module 2013 can contain information based on the aforementioned input.

[0268] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) sent from external devices and displays it on the information service unit 2012 provided by the vehicle. The information service unit 2012 can also be referred to as an output unit for outputting information (for example, outputting information to devices such as displays and speakers based on the PDSCH received by the communication module 2013 (or data / information decoded from the PDSCH). In addition, the communication module 2013 stores the various information received from external devices in a memory 2032 available to the microprocessor 2031. The microprocessor 2031 can also control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gear lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021 to 2028, etc., provided by the vehicle 2001 based on the information stored in the memory 2032.

[0269] (Postscript)

[0270] The above disclosure can also be expressed as follows. The first feature is a wireless base station comprising: a receiving unit that receives a measurement report from a terminal; and a control unit that, based on the measurement report, sets a plurality of candidate sub-cells that the terminal can autonomously select.

[0271] The second feature is that, in the first feature, the control unit sets the execution conditions for adding, deleting, or changing the sub-cell.

[0272] The third feature is a terminal comprising: a receiving unit that receives signaling that a subcell is transferred to a lower layer in a rest state accompanied by reduced energy consumption; and a control unit that, upon receiving the signaling, deletes or deactivates the subcell.

[0273] The fourth feature is that, in the third feature, the control unit, upon receiving the signaling, begins to monitor the execution conditions for the deletion or modification of the sub-cell.

[0274] The fifth feature is a wireless base station comprising: a communication unit that performs wireless communication with a terminal via a secondary cell; and a control unit that, when setting candidates for the secondary cell, sets a priority for the secondary cell, the control unit setting the priority based on at least one of energy consumption cost in the secondary cell, required communication quality, and the capabilities of the terminal.

[0275] The sixth feature is that, in the fifth feature, the control unit sets the priority for each candidate of the sub-cell when applying at least one of conditional handover, conditional cell change, and low-layer mobility control.

[0276] The seventh feature is that, in the fifth or sixth feature, the control unit sets the priority based on at least one of the congestion level of the sub-cell and whether or not there is a resting state.

[0277] Label Explanation

[0278] 10: Wireless Communication System

[0279] 20: NG-RAN

[0280] 100: gNB

[0281] 200:UE

[0282] 210: Wireless Signal Transceiver Unit

[0283] 220: Enlarged section

[0284] 230: Modulation and Demodulation Section

[0285] 240: Control Signal & Reference Signal Processing Unit

[0286] 250: Encoding / Decoding Section

[0287] 260: Data Transceiver Department

[0288] 270: Control Department

[0289] 1001: Processor

[0290] 1002: Memory

[0291] 1003: Storage device

[0292] 1004: Communication device

[0293] 1005: Input device

[0294] 1006: Output device

[0295] 1007: Bus

[0296] 2001: Vehicles

[0297] 2002: Drive Unit

[0298] 2003: Steering Unit

[0299] 2004: Accelerator Pedal

[0300] 2005: Brake Pedal

[0301] 2006: Gear Shift

[0302] 2007: Left and right front wheels

[0303] 2008: Left and right rear wheels

[0304] 2009: Axle

[0305] 2010: Electronic Control Department

[0306] 2012: Information Services Department

[0307] 2013: Communication Module

[0308] 2021: Current Sensor

[0309] 2022: Speed ​​Sensor

[0310] 2023: Barometric Pressure Sensor

[0311] 2024: Vehicle Speed ​​Sensor

[0312] 2025: Accelerometer

[0313] 2026: Brake Pedal Sensor

[0314] 2027: Gearshift Sensor

[0315] 2028: Object Detection Sensor

[0316] 2029: Accelerator Pedal Sensor

[0317] 2030: Driver Assistance Systems Department

[0318] 2031: Microprocessors

[0319] 2032: Memory (ROM, RAM)

[0320] 2033: Communication Port

Claims

1. A wireless base station, comprising: The communications department, which performs wireless communication with the terminal via the sub-cell; and The control unit, when setting candidates for the secondary cells, sets a priority for the secondary cells. The control unit sets the priority based on at least one of the energy consumption cost in the sub-cell, the required communication quality, and the capabilities of the terminal.

2. The wireless base station according to claim 1, wherein, When applying at least one of conditional handover, conditional cell change, and low-layer mobility control, the control unit sets the priority for each candidate of the sub-cell.

3. The wireless base station according to claim 1, wherein, The control unit sets the priority based on at least one of the congestion level of the sub-cell and whether it is in a resting state.

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