Terminal, base station, and communication method

Abstract

This terminal comprises: a control unit that accesses a cell of a second radio access technology from a cell of a first radio access technology; and a reception unit that receives information relating to network energy saving (NES) that is applied to the cell of the second radio access technology. On the basis of the information, the control unit executes access to the cell of the second radio access technology.

Description

Terminal, base station, and communication method

[0001] The present disclosure relates to a terminal, a base station, and a communication method for accessing a cell of a network to which energy reduction is applied.

[0002] The 3rd Generation Partnership Project (3GPP (registered trademark)) is standardizing the 5th generation mobile communication system (also called 5G, New Radio (NR), or Next Generation (NG)), and is also proceeding with the standardization of the next-generation mobile communication system called Beyond 5G, 5G Evolution, or 6G.

[0003] When a 5G-compatible terminal is in a 4G cell of 4G RAT (Radio Access Technology), it receives cell information of a 5G cell of 5G RAT from the system information (SIB (System Information Block) 24) notified in the 4G cell, searches for the 5G cell using a synchronization signal, obtains SIB1 notified in the searched 5G cell, and accesses (also called camping on) the 5G cell. (Non-Patent Document 1)

[0004] 3GPP TS 36.331 V18.3.1, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 18), 3GPP, September 2024

[0005] In the future, when a 6G RAT is introduced, there is a need to access and distribute 6G-compatible terminals in 4G or 5G cells to 6G cells of 6G RAT as much as possible.

[0006] However, 6G may use high-frequency bands (carriers) that consume a lot of power. From the perspective of reducing network energy consumption (NES: Network Energy Saving), it is possible to consider measures such as not transmitting SSB (Synchronization Signal Block) (SSB-less cell), lengthening the SSB period, or not transmitting SIB1, especially in 6G cells using high-frequency bands.

[0007] Therefore, simply selecting a 6G cell based on cell information, as in the past, presents a problem in that it is not possible to quickly and reliably obtain the signals (SSB, SIB1, etc.) necessary to access the 6G cell.

[0008] Therefore, this disclosure is made in view of these circumstances and aims to provide terminals, base stations, and communication methods that enable rapid and reliable access to network cells to which NES is applied.

[0009] One aspect of the present disclosure is a terminal (200) comprising a control unit (220) that accesses a cell of a second wireless access technology from a cell of a first wireless access technology, and a receiving unit (210) that receives information regarding network energy saving (NES) applied to the cell of the second wireless access technology, wherein the control unit accesses the cell of the second wireless access technology based on the information.

[0010] One aspect of the present disclosure is a base station (100) comprising a transmitting unit (120) that transmits information relating to network energy saving (NES) applicable to a cell of a second radio access technology in a cell of a first radio access technology, and a control unit (130) that causes the transmitting unit to transmit the information as broadcast information to be broadcast in the cell of the first radio access technology, or as a radio resource control message.

[0011] One aspect of the present disclosure is a communication method comprising the steps of accessing a cell of a second wireless access technology from a cell of a first wireless access technology, receiving information relating to network energy saving (NES) applied to the cell of the second wireless access technology, and accessing the cell of the second wireless access technology based on the information.

[0012] Figure 1 is a schematic diagram of the overall configuration of a wireless communication system. Figure 2 is a diagram showing the frequency range used in the wireless communication system. Figure 3 is a diagram showing an example of the configuration of wireless frames, subframes, slots, and symbols used in the wireless communication system. Figure 4 is a diagram showing an example of carrier types in 6G. Figure 5 is a functional block diagram of a base station. Figure 6 is a functional block diagram of a terminal. Figure 7 is a diagram showing the first embodiment. Figure 8 is a diagram showing the first sequence in the first embodiment. Figure 9 is a diagram showing the second sequence in the first embodiment. Figure 10 is a diagram showing the third sequence in the first embodiment. Figure 11 is a diagram showing the fourth sequence in the first embodiment. Figure 12 is a diagram showing the fifth sequence in the first embodiment. Figure 13 is a diagram showing the sixth sequence in the first embodiment. Figure 14 is a diagram showing the second embodiment. Figure 15 is a diagram showing the first sequence in the second embodiment. Figure 16 is a diagram showing the second sequence in the second embodiment. Figure 17 is a diagram showing the third sequence in the second embodiment. Figure 18 is a diagram showing an example of the hardware configuration of a base station and a terminal. Figure 19 is a diagram showing an example of the configuration of a vehicle.

[0013] The embodiments will be described below with reference to the drawings. Note that identical or similar reference numerals are used to denote the same functions and components, and their descriptions will be omitted as appropriate.

[0014] (1) Overall schematic diagram 1 of the wireless communication system is an overall schematic diagram of the wireless communication system 10 according to the embodiment. The wireless communication system 10 has a terminal 200 (hereinafter referred to as UE (User Equipment) 200), a first network 10A and a second network 10B.

[0015] The first network 10A includes a radio access network 20A and a core network 30A. The radio access network 20A includes a base station 100A that performs wireless communication with the UE200. However, the first network 10A may not have the radio access network 20A but may have the base station 100A. The first network 10A may not have the core network 30A. The base station 100A may consist of a DU (Distributed Unit) and a CU (Central Unit). The DU may perform processing at the MAC layer or lower. The CU may perform processing at the PDCP layer or higher.

[0016] The wireless access network 20A may be a network conforming to existing wireless access technology (4G RAT or 5G RAT). 4G may be referred to as LTE (Long Term Evolution), and 5G may be referred to as 5G New Radio (NR).

[0017] Area 1 40A is a communication service area provided by Network 1 10A. Area 1 40A consists of a single cell or multiple cells. If Network 1 10A is a 4G network, it may be referred to as a 4G area or 4G cell, and if Network 1 10A is a 5G network, it may be referred to as a 5G area or 5G cell.

[0018] The second network 10B includes a radio access network 20B and a core network 30B. The radio access network 20B includes a base station 100B that performs wireless communication with the UE 200. However, the second network 10B may not have the radio access network 20B but may have the base station 100B. The second network 10B may not have the core network 30B. The base station 100B may be composed of a DU and a CU.

[0019] The wireless access network 20B may be a network conforming to a new wireless access technology (6G RAT). 6G may also be referred to as Beyond 5G or 5G Evolution.

[0020] Area 40B is the communication service area provided by Network 10B. Area 40B consists of a single cell or multiple cells. If Network 10B is a 6G network, it may also be referred to as a 6G area or 6G cell.

[0021] In the second network 10B of the embodiment, a technology for reducing the energy consumption of the network, including the base station 100B, may be introduced (NES). The method of reducing energy consumption by NES is not particularly limited, but typically includes not transmitting SSB and / or SIB1 in a certain cell, or setting a longer transmission period for SSB and / or SIB1 in a certain cell. It may also include transitioning a cell to a sleep state, causing a cell formed by the base station 100B to transition to a sleep state, and DTX / DRX (Discontinuous Transmission / Discontinuous Reception) which performs transmission and reception by the base station 100B intermittently.

[0022] Figure 1 shows an example where the 6G area overlaps with the 4G or 5G area. In other words, in this example, the 6G area is included within the 4G or 5G area. Thus, even if a 6G network is introduced, the 6G area will only be able to cover a portion of the area covered by the existing network for the time being.

[0023] The UE200 is a 6G-compatible terminal that conforms to the new 6G technology. A 6G-compatible terminal supports communication functions conforming to 6G in addition to those conforming to existing technologies (4G and / or 5G). In the aforementioned overlapping areas, the UE200 can communicate according to 4G by being located in a 4G cell, or according to 5G by being located in a 5G cell, and further, it can communicate according to 6G by being located in a 6G cell. This location may also be referred to as "camp-on."

[0024] Furthermore, the wireless communication system 10 may support multiple frequency ranges (FRs). That is, as shown in Figure 2, it may support the following FRs: • FR1: 410 MHz to 7.125 GHz • FR2-1: 24.25 GHz to 52.6 GHz • FR2-2: Over 52.6 GHz to 71 GHz

[0025] In FR1, a subcarrier spacing (SCS) of 15, 30, or 60 kHz and a bandwidth (BW) of 5 to 100 MHz may be used. In FR2-1, an SCS of 60 or 120 kHz (or 240 kHz) and a BW of 50 to 400 MHz may be used.

[0026] In FR2-2, to avoid an increase in phase noise, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) with a larger SCS may be applied.

[0027] Furthermore, as shown in Figure 3, one slot in the wireless communication system 10 consists of 14 symbols. If this configuration is maintained, the larger (wider) the SCS becomes, the shorter the symbol period (and slot period). Note that the SCS is not limited to the frequencies shown in Figure 3, and may be other frequencies such as 480 kHz or 960 kHz.

[0028] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14; for example, it could be 28 or 56 symbols. In addition, the number of slots per subframe may vary depending on the SCS.

[0029] (2) Carrier configuration diagram 4 is a diagram showing an example of the carrier types that 6G RAT can support. The wireless access network 20B in Figure 1 may support the carrier types shown in Figure 4.

[0030] Figure 4 shows an example where the anchor carrier is located in two frequency bands (Band A and Band B), and the data carrier is located in a higher frequency band (Band C) than the anchor carrier. The perch carrier is shown by a dashed line, and if a perch carrier is introduced in 6G, it may be set to a lower frequency than the anchor carrier, or it may be set to a part of the same frequency band as the anchor carrier.

[0031] Furthermore, anchor carriers may also be called anchor cells or anchor bands, and perch carriers may also be called perch cells or perch bands. In addition, anchor cells may be composed of anchor carriers, and perch cells may be composed of perch carriers.

[0032] A perch carrier may also be called an anchor carrier. An anchor carrier (or perch carrier) may carry synchronization signals (PSS, SSS), sync raster, MIB / SIB / other SIBs, and control signaling (PDCCH, DCI) for non-anchor carriers (e.g., data carriers). Carriers other than anchor carriers may be called non-anchor carriers. Carriers other than perch carriers may be called non-perch carriers.

[0033] Option 1) If a perch carrier is not introduced: In 6G, if a perch carrier is not introduced, the perch carrier shown in Figure 4 does not exist, and only the anchor carrier and data carrier exist. For example, the NES effect may be achieved by not transmitting SSB (SSB-less cell) or lengthening the SSB transmission period for part of the anchor carrier or all or part of the data carrier, or by not transmitting SIB (e.g., SIB1) or lengthening the SIB (e.g., SIB1) transmission period.

[0034] Cells composed of carriers to which NES applies may also be called NES cells. In NES cells that do not support SIB, terminals cannot receive SIB. Also, in NES cells that do not support SSB and SIB, terminals cannot receive either SSB or SIB.

[0035] Furthermore, NES cells that do not support SIB may support On-Demand SIB1. In On-Demand SIB1, a terminal sends a WUS (Wake-Up Signal) to the NES cell using a WUS config to request On-Demand SIB1. The WUS config is different for each NES cell. When an NES cell receives an On-Demand SIB1 request, it announces the On-Demand SIB1. The terminal can then obtain the On-Demand SIB1 and access the cell.

[0036] Option 2) Introducing a Perch Carrier One of the purposes of introducing a perch carrier is to enable data communication on the anchor carrier as needed (on demand). For example, a terminal can access the anchor carrier when data is generated, the data carrier as needed, and the perch carrier otherwise. This allows the anchor carrier or data carrier that is not performing data communication to be turned off, thereby enhancing the NES effect. Furthermore, the anchor carrier or data carrier can achieve the NES effect by not transmitting SSB or SIB, or by setting a longer transmission cycle. Note that the term "access" may be interpreted interchangeably with the terms "cell selection" or "cell re-selection".

[0037] A perch carrier may be understood as a carrier having at least one of the following features, for example:

[0038] - It is a carrier that all devices can access.

[0039] - The carrier is accessible regardless of the terminal type or usage environment (however, some terminals that meet different conditions than the type or usage environment may be configured to be inaccessible). Terminal types include, for example, enhanced Mobile BroadBand (eMBB) terminals, Reduced Capability (RedCap) terminals, Unmanned Aerial Vehicle (UAV) terminals, XR terminals, NTN terminals, IoT terminals, Industrial IoT terminals, NarrowBand IoT (NB-IoT) terminals, Low-Power Wake-Up Signal (LPWUS) terminals, and Small Data Transmission (SDT) terminals. Terminal usage environments include, for example, access type (e.g., 3GPP, non-3GPP), use case (e.g., Immersive Communication, Ubiquitous Connectivity), and service type (e.g., Ultra-Reliable and Low Latency Communications (URLLC), Vehicle to X (V2X), Multicast and Broadcast Service (MBS), Broadcast Service).

[0040] This refers to a carrier that is accessible regardless of whether data communication is enabled or disabled (a carrier not intended for data communication). Data communication primarily refers to the transmission and reception of user data and traffic data processed by the U-Plane (User-Plane). User data may include voice calls, but does not exclude control data. Hereafter, this will also be simply referred to as "communication."

[0041] - This is a carrier on which synchronization signals (SS) and / or system information are transmitted. Synchronization signals may include, for example, PSS (Primary Synchronization Signal) and / or SSS (Secondary Synchronization Signal). System information may include, for example, MIB (Master Information Block) transmitted on a broadcast channel (e.g., PBCH (Physical Broadcast Channel)) and / or SIB (e.g., SIB1) transmitted on a downlink shared channel (e.g., PDSCH (Physical Downlink Shared Channel)). Since system information is broadcast on the broadcast channel and / or downlink shared channel, it may also be called broadcast information. Furthermore, the block containing the synchronization signals and broadcast channels may be called SSB or SS / PBCH (synchronization signal / physical broadcast channel block), etc. Thus, the perch carrier can also be described as a carrier on which control information (e.g., signals and / or information for initial access) is transmitted. System information transmitted and received on the perch carrier may include information about other carriers (data carrier (Band C), anchor carrier (Bands A and B) in the diagram). Information about other carriers is, for example, information that allows a terminal accessing the perch carrier to select another carrier (to perform initial access to another carrier). Also, if another carrier transitions to Network Energy Saving mode (NES mode), information about the other carrier may include information about NES mode. Information about NES mode is, for example, Cell DTX config (periodicity), Cell DRX config (periodicity), and SSB periodicity.

[0042] The perch carrier may be in a lower frequency band than the data carrier (Band C) that transmits and receives data, or the anchor carrier (Bands A and B) that transmits and receives control information (and data). Due to frequency characteristics, coverage is greater in the lower frequency band, so coverage can be ensured by using a carrier in a lower frequency band than the anchor carrier as the perch carrier. On the other hand, by using a carrier in a higher frequency band than the perch carrier as the anchor carrier, a wider bandwidth can be ensured, thereby improving throughput. In this way, by combining a perch carrier and an anchor carrier, coverage can be ensured and throughput can be improved.

[0043] One use case for perch carriers and anchor carriers is to use a wideband frequency band with higher frequencies as an anchor carrier to support high-speed, high-capacity communication services such as XR (Cross Reality or Extended Reality) terminals. However, because such high frequencies are directional, they are susceptible to reflection, requiring beam sweeping or the application of multiple beams, which increases network power consumption. Therefore, when providing high-speed, high-capacity communication services to terminals, a high-frequency band can be provided (turned on) as the anchor carrier. However, when not providing high-speed, high-capacity communication services to terminals, the high-frequency band can not be provided as the anchor carrier (turned off), and the terminals can be kept on standby with a perch carrier on a lower frequency band. By setting the perch carrier to a lower frequency band, coverage can be easily ensured compared to high frequencies because lower frequencies have the property of bending around, and network power consumption can also be reduced. Thus, perch carriers and anchor carriers are also suitable for the introduction of NES.

[0044] "Waiting (camping on) via a prach carrier" may be used in the same sense as waiting in a prach cell or waiting in a prach band. Note that waiting may be used to mean waiting for a communication service. Also, waiting may be used to mean "camping on". The state of the UE performing the waiting may be understood to be a state where the RRC connection is not established or suspended, such as the idle state (e.g., RRC_Idle state) or the inactive state (e.g., RRC_Inactive state).

[0045] The prach carrier may be recognizable by the terminal by default or may be set by the network (base station). For example, the prach carrier may be assigned to a frequency band where it is relatively easy to secure coverage. The prach carrier may be understood to be a prach carrier group composed of a plurality of prach carriers.

[0046] The anchor carrier is a carrier that transmits and receives control information (and data), and may be assigned to Band A or Band B, for example, in a frequency band higher than the prach carrier (e.g., 2 GHz band, etc.). In contrast, the data carrier is a carrier that transmits and receives data and may be assigned to Band C, which is a frequency band higher than the anchor carrier (e.g., 3.7 GHz band, 4.5 GHz band, 28 GHz band, etc.). These carriers may be used appropriately depending on the type of terminal and the use case. For example, when an XR terminal or UE uses an XR service, it is conceivable to transition from the prach carrier to the anchor carrier in Band A or B with a higher frequency or the data carrier in Band C to perform RACH and enter the connected state (e.g., RRC_Connected state).

[0047] "Waiting via the anchor carrier" may be used in the same sense as waiting in an anchor cell or waiting in an anchor band.

[0048] Also, in the embodiment, the anchor carrier is a carrier having the role of a PCC (Primary Component Carrier) or a PCell (Primary Cell), and the data carrier may be considered as a carrier having the role of an SCC (Secondary Component Carrier).

[0049] Note that the terms "cell", "frequency", "frequency band", "band", and "carrier" may be read interchangeably with each other.

[0050] In the embodiment, the anchor carrier may be used in the sense of a broad anchor carrier including a data carrier, and the anchor cell may be used in the sense of a broad anchor cell including a data cell.

[0051] (3) Functional Block Configuration of Radio Communication System (3.1) Functional Block Configuration of Base Station As shown in FIG. 5, base stations 100A and 100B include a radio communication unit 110, a NES-related information providing unit 120, and a control unit 130.

[0052] In the base station 100B of the embodiment, a technology for reducing network energy consumption (NES) may be applied. When applying NES, for example, the 6G base station 100B providing an anchor cell may provide a cell that does not transmit SSB and / or SIB1, a cell with a long transmission period of SSB and / or SIB1, etc. If a partial carrier is introduced, NES may not be applied to the 6G base station 100B providing a partial cell.

[0053] The radio communication unit 110 transmits and receives radio signals to and from the UE 200. The radio signals include channels and reference signals.

[0054] The wireless communication unit 110 transmits and receives wireless signals via control channels or data channels. Control channels include the physical uplink control channel (PUCCH), physical downlink control channel (PDCCH), physical random access channel (PRACH), and physical broadcast channel (PBCH). Data channels include the physical uplink sharing channel (PUSCH) and physical downlink sharing channel (PDSCH). Data may refer to data transmitted via the data channel. Reference signals include the Demodulation Reference Signal (DMRS), Phase Tracking Reference Signal (PTRS), Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS).

[0055] The wireless communication unit 110 can transmit one or more broadcast information. The broadcast information may be a master information block (MIB) or a system information block (SIB).

[0056] In this embodiment, the broadcast information SIB24 transmitted by the wireless communication unit 110 of the 4G base station 100A may include all or part of the 6G cell-related information (e.g., CarrierFreqList6G) in addition to the NR cell-related information (e.g., CarrierFreqListNR). The newly defined broadcast information SIBxx transmitted by the wireless communication unit 110 of the 5G base station 100A may include all or part of the above 6G cell-related information (e.g., CarrierFreqList6G). Furthermore, the newly defined broadcast information SIByy transmitted by the wireless communication unit 110 of the 6G base station 100B via the perch carrier may include all or part of the 6G anchor cell-related information (e.g., CarrierFreqList6G).

[0057] In an embodiment, CarrierFreqList6G, which is 6G cell-related information, may include multiple CarrierFreq6G. CarrierFreq6G may include all or some of the following information elements: • Carrier frequency information (Carrier freq info) • SSB period (SSB duration), measurement timing config (PCI list, periodicity), SSBToMeasure • If a new RS (Reference Signal) is introduced to 6G, the period of the new RS (newRS duration), measurement timing config (PCI list, periodicity), newRTSToMeasure

[0058] Note that the information elements of CarrierFreq6G are not limited to those listed above, and may include any information related to the 6G cell. If a perch carrier is introduced in 6G, the CarrierFreq6G for the perch carrier may be included. The CarrierFreq6G for a perch carrier may include information (flags) indicating whether that carrier is a perch carrier.

[0059] Furthermore, the wireless communication unit 110 can send an RRC message to the UE200 to release the RRC.

[0060] In this embodiment, the IdleModeMobilityControlInfo IE of the RRCConnectionRelease message transmitted to the UE200 by the wireless communication unit 110 of the 4G base station 100A may have 6G cell-related information (e.g., FreqPriorityList6G) added to it. Similarly, the IdleModeMobilityControlInfo IE of the RRCRelease message transmitted to the UE200 by the wireless communication unit 110 of the 5G base station 100A may have 6G cell-related information (e.g., FreqPriorityList6G) added to it.

[0061] In this embodiment, FreqPriorityList6G, which is 6G cell-related information, contains carrier priority information and may include multiple FreqPriority6G. FreqPriority6G may include the CarrierFreq6G described above.

[0062] The wireless communication unit 110 sends a paging message to the UE200. The wireless communication unit 110 receives an initial access request from the UE200 and sends a response to the UE200 containing the necessary initial access procedure. The initial access may be a random access procedure.

[0063] The wireless communication unit 110 can receive information transmitted by the wireless communication unit 210, which will be described later. Furthermore, the wireless communication unit 110 can transmit information received by the wireless communication unit 210, which will also be described later.

[0064] The NES-related information provision unit 120 provides information related to the 6G cell's NES (NES-related information) to the UE200.

[0065] In the embodiment, NES-related information may be understood to include information indicating that Network Energy Saving (NES) is being applied to the 6G cell. For example, if the SSB and SIB (e.g., SIB1) required to access the 6G cell are not transmitted, or the transmission cycle is set to a longer duration, it may be understood that Network Energy Saving is being applied.

[0066] Specifically, NES-related information may include all or part of the following information elements: - Carrier frequency information - Indication indicating whether or not to transmit SIB1 - If the SIB1 period is extended, the period of SIB1 in NES mode - SIB1 information of the 6G cell, cell ID (e.g., cell ID=1, SIB1, cell ID=2, SIB1) - MIB information of the 6G cell, cell ID (e.g., cell ID=1, MIB, cell ID=2, MIB) - If the SIB period of SIB2 and later is extended, the period of SIB in NES mode - SSB period in NES mode (e.g., longer than the normal SSB period), measurement timing config of NES mode (PCI list, periodicity), SSBToMeasure of NES mode - If New RS is introduced to the 6G cell, the new RS period in NES mode (newRS duration), measurement timing config of NES mode (PCI list, periodicity), newRSToMeasure of NES mode - Synchronization signal of 6G carrier / cell (e.g., PSS, SSS) sync raster ・WUS (Wake Up Signal) config for accessing 6G anchor cells (e.g., RACH config, cell ID)

[0067] Furthermore, the information elements of NES-related information are not limited to those listed above; any information related to the NES effect may be included.

[0068] The NES-related information providing unit 120 of the embodiment may constitute a transmitting unit that transmits network energy saving (NES) information applicable to the cell of the second wireless access technology in the cell of the first wireless access technology. The cell of the first wireless access technology may be a 4G or 5G cell, and the cell of the second wireless access technology may be a 6G cell. The network energy saving (NES) information applicable to the cell of the second wireless access technology may include NES-related information.

[0069] NES-related information may be understood as information indicating that the opportunities to transmit signals necessary for accessing cells of the second radio access technology are reduced or eliminated. Signals such as SSB and SIB1 broadcast on 6G anchor cells may be understood as signals necessary for accessing cells of the second radio access technology. Reducing the opportunities to transmit signals includes reducing the opportunities to transmit signals by lengthening the transmission period of signals. Eliminating the opportunities to transmit signals may include not transmitting signals or not supporting signal transmission, and may also include cases where signals are transmitted on demand (e.g., on-demand SIB1).

[0070] In this embodiment, the NES-related information provision unit 120 of the 4G base station 100A may include NES-related information as part of the 6G cell-related information broadcast in the SIB24, or it may include NES-related information as a separate information element from the 6G cell-related information. Similarly, the NES-related information provision unit 120 of the 5G base station 100A may include NES-related information as part of the 6G cell-related information broadcast in the new SIBxx, or it may include NES-related information as a separate information element from the 6G cell-related information. Furthermore, the NES-related information provision unit 120 of the 6G base station 100B may include NES-related information as part of the anchor cell-related information in the new SIByy broadcast in the perch carrier, or it may include NES-related information as a separate information element from the anchor cell-related information.

[0071] In one embodiment, the NES-related information provision unit 120 of the 4G base station 100A adds 6G cell-related information (e.g., FreqPriorityList6G) to the IdleModeMobilityControlInfo IE of the RRCConnectionRelease message to the UE200, and may include NES-related information as part of the 6G cell-related information (e.g., FreqPriorityList6G), or may include NES-related information as a separate information element from the 6G cell-related information (e.g., FreqPriorityList6G). The NES-related information provision unit 120 of the 5G base station 100A adds 6G cell-related information (e.g., FreqPriorityList6G) to the IdleModeMobilityControlInfo IE of the RRCRelease message to the UE200, and may include NES-related information as part of the 6G cell-related information (e.g., FreqPriorityList6G), or may include NES-related information as a separate information element from the 6G cell-related information (e.g., FreqPriorityList6G).

[0072] The control unit 130 controls each functional block that constitutes the base station 100. For example, the control unit 130 controls the transmission and reception of wireless signals by the wireless communication unit 110 and the provision of NES-related information by the NES-related information provision unit 120.

[0073] The control unit 130 receives an initial access request from the UE200 and executes the initial access procedure. The control unit 130 performs scheduling for the UE200. The control unit 130 also performs processing related to control signals, such as radio resource control (RRC) signaling.

[0074] (3.2) As shown in the terminal's functional block configuration diagram 6, the UE200 comprises a wireless communication unit 210, a cell selection / re-selection execution unit 220, and a control unit 230.

[0075] The wireless communication unit 210 transmits and receives wireless signals with base stations 100A and 100B.

[0076] The wireless communication unit 210 can receive one or more broadcast information from base stations 100A and 100B. The broadcast information may be MIB / SIB. The broadcast information in this embodiment may include NES-related information as 6G cell-related information, or it may include NES-related information for information separate from 6G cell-related information. The broadcast information may also include an information element indicating the resource for initial access between the UE 200 and the base station 100. The resource for initial access may mean a RACH resource.

[0077] The wireless communication unit 210 of the embodiment may be configured as a receiving unit that receives information regarding network energy saving (NES) applied to a cell of the second wireless access technology.

[0078] The wireless communication unit 210 can receive paging messages from base stations 100A and 100B. The wireless signal transceiver unit 210 also receives downlink control information for scheduling.

[0079] Furthermore, the wireless communication unit 210 can receive information transmitted by the wireless communication unit 110. Also, the wireless communication unit 210 can transmit information received by the wireless communication unit 110.

[0080] The cell selection / reselection execution unit 220 performs cell selection and cell reselection. Cell selection / reselection may include the selection / reselection of a perch carrier (or perch cell) in addition to the selection / reselection of an anchor carrier (or anchor cell). In cell selection, for example, the cell with the strongest received power (RSRP: Reference Signal Received Power) among multiple carriers or cells may be selected. The cell selection / reselection execution unit 220 may first perform perch carrier selection after the UE powers up and access a good quality perch carrier to wait, and then perform anchor cell selection to access the anchor carrier when the UE receives communication services.

[0081] The cell selection / reselection execution unit 220 of the embodiment accesses a 6G cell based on network energy saving (NES) information applicable to the 6G cell received by the wireless communication unit 210. The cell selection / reselection execution unit 220 may select a 6G cell (6G anchor cell) based on broadcast information (e.g., SIB24, SIBxx, or SIByy) containing NES information for the 6G cell (6G anchor cell) received by the wireless communication unit 210. Alternatively, the cell selection / reselection execution unit 220 may select a 6G cell (6G anchor cell) based on an RRC message (e.g., RRCConnection message, or RRCRelease message) containing NES information for the 6G cell (6G anchor cell) received by the wireless communication unit 210. For example, the cell selection / reselection execution unit 220 can select a 6G cell that is transmitting the necessary signals (SSB, SIB1, etc.) to access the 6G cell based on NES-related information.

[0082] Specifically, the cell selection / re-selection execution unit 220 may perform a cell search for 6G anchor cells to which SSB and SSB1 are transmitted, and access the searched 6G anchor cells. The cell selection / re-selection execution unit 220 may prioritize the cell search for 6G anchor cells with shorter SSB transmission periods over 6G anchor cells with longer SSB transmission periods, and access the searched 6G anchor cells. Furthermore, if the SSB transmission period is the same for multiple 6G anchor cells, the cell selection / re-selection execution unit 220 may prioritize the cell search for 6G anchor cells with shorter SIB1 transmission periods over 6G anchor cells with longer SIB1 transmission periods, and access the searched 6G anchor cells.

[0083] The cell selection / re-selection execution unit 220 of the embodiment may be configured as a control unit that accesses the cell of the second wireless access technology based on information regarding network energy saving (NES) applied to the cell of the second wireless access technology.

[0084] The control unit 230 controls each functional block that makes up the UE200. For example, the control unit 230 controls the transmission and reception of wireless signals by the wireless communication unit 210 and the selection and reselection of cells by the cell selection / reselection execution unit 220.

[0085] (4) Operation of wireless communication systems (4.1) Challenges In the future, when 6G is introduced, there is a need to distribute 6G-compatible terminals that are in 4G or 5G cells to as many 6G cells as possible.

[0086] However, 6G may use high-frequency bands (carriers) that consume a lot of power, and from an NES perspective, especially in 6G cells in high-frequency bands, it is possible to consider not transmitting SSB (SSB-less cell), lengthening the SSB period, or not transmitting SIB1.

[0087] Therefore, simply selecting a 6G cell based on cell information, as in the past, presents a problem in that it is not possible to quickly and reliably obtain the signals (SSB, SIB1, etc.) necessary to access the 6G cell.

[0088] The technical challenges that this disclosure seeks to address are not limited to those mentioned above, and other technical challenges not mentioned herein will be clearly understood by a person with ordinary skill in the art to which this disclosure pertains, based on the description herein.

[0089] (4.2) Operation Example (4.2.1) Operation Example 1 Figure 7 shows a first embodiment, where a perch carrier is not introduced in 6G. In Figure 7, the 6G anchor cell covers a portion of the area of ​​the 4G or 5G cell. From an NES perspective, the 6G anchor cell may not transmit SSB or SIB (e.g., SIB1), or the transmission period may be set to be long. In such cases, the 4G or 5G base station 100A transmits NES-related information for the 6G cell (6G anchor cell) in the 4G or 5G cell.

[0090] A 4G or 5G base station 100A may receive NES-related information for a 6G cell (6G anchor cell) from a 6G base station 100B. The 6G base station 100B may also transmit NES-related information for a 6G cell (6G anchor cell) to a 4G or 5G base station 100A. The 4G or 5G base station 100A may request the 6G base station 100B to provide NES-related information for a 6G cell (6G anchor cell). Upon receiving a request for NES-related information for a 6G cell (6G anchor cell), the 6G base station 100B may transmit NES-related information for a 6G cell (6G anchor cell) to a 4G or 5G base station 100A.

[0091] Option 1A) Figure 8 shows the first sequence in the first embodiment. In Figure 8, the 4G base station 100A broadcasts an SIB24 containing NES-related information as part of the 6G cell-related information, or as an information element separate from the 6G cell-related information. The UE200 selects a 6G anchor cell based on the NES-related information in the SIB24 and accesses the 6G anchor cell.

[0092] Option 1B) Figure 9 shows the second sequence in the first embodiment. In Figure 9, the 4G base station 100A sends an RRCConnectionRelease message containing NES-related information to the UE200, either as part of the 6G cell-related information or as an information element separate from the 6G cell-related information. The UE200 selects a 6G anchor cell based on the NES-related information in the RRCConnectionRelease message and accesses the 6G anchor cell.

[0093] Option 1C) Figure 10 shows the third sequence in the first embodiment. In Figure 10, the 5G base station 100A broadcasts a newly defined SIBxx containing NES-related information as part of the 6G cell-related information, or as an information element separate from the 6G cell-related information. The UE200 selects a 6G anchor cell based on the NES-related information in the SIBxx and accesses the 6G anchor cell.

[0094] Option 1D) Figure 11 shows the fourth sequence in the first embodiment. In Figure 11, the 5G base station 100A sends an RRCRelease message containing NES-related information to the UE200, either as part of the 6G cell-related information or as an information element separate from the 6G cell-related information. The UE200 selects a 6G anchor cell based on the NES-related information in the RRCRelease message and accesses the 6G anchor cell.

[0095] Thus, according to options 1A to 1D, the UE200 can receive not only 6G anchor cell information but also NES-related information for that 6G anchor cell in a 4G or 5G cell. This allows the UE200 to select a 6G anchor cell based on the NES-related information and access the 6G anchor cell directly when accessing a 6G anchor cell from a 4G or 5G cell.

[0096] Option 1E) Figure 12 shows the fifth sequence in the first embodiment. In Figure 12, the method by which the 4G or 5G base station 100A transmits NES-related information to the UE200 is the same as in Options 1A to 1D. Figure 12 shows the sequence in which the UE200 uses the WUS information contained in the received NES-related information to directly acquire SIB1 from the 6G base station 100B, which is a 6G NES cell, and access the 6G anchor cell.

[0097] The UE200 receives NES-related information for 6G cells from the 4G or 5G base station 100A. This NES-related information includes WUS information for the RACH resource for on-demand SIB1 requests for 6G anchor cells that support on-demand SIB1. Specifically, it may consist of the following information: • 6G NES Cell ID=XX, frequency=XX, WUS config for on-demand SIB1 request (e.g., RACH resource X) • 6G NES Cell ID=YY, frequency=YY, WUS config for on-demand SIB1 request (e.g., RACH resource Y) • 6G NES Cell ID=ZZ, frequency=ZZ, WUS config for on-demand SIB1 request (e.g., RACH resource Z)

[0098] For example, UE200 selects 6G NES Cell ID=XX and sends an on-demand SIB1 request to 6G base station 100B with 6G NES Cell ID=XX using RACH resource X. 6G base station 100B with 6G NES Cell ID=XX receives the on-demand SIB1 request and sends an on-demand SIB1. UE200 then receives the on-demand SIB1 sent from 6G base station 100B with 6G NES Cell ID=XX. In this way, UE200 obtains the SIB1 and can access the 6G anchor cell of 6G base station 100B with 6G NES Cell ID=XX.

[0099] Option 1F) Figure 13 shows the sixth sequence in the first embodiment. In Figure 13, the method by which the 4G or 5G base station 100A transmits NES-related information to the UE200 is the same as in Options 1A to 1D. Figure 13 shows the sequence in which the UE200 uses the WUS information contained in the NES-related information received by the 4G or 5G base station 100A to indirectly obtain the SIB1 of the 6G NES cell base station 100B and access the 6G anchor cell.

[0100] The UE200 receives NES-related information for 6G cells from 4G or 5G base station 100A. This NES-related information includes WUS information for RACH resources for on-demand SIB1 requests for 6G anchor cells that support on-demand SIB1.

[0101] In Figure 13, unlike option 1E, the UE200 sends an on-demand SIB1 request to the 4G or 5G base station 100A that transmitted the NES-related information, using the RACH resource X with the 6G NES Cell ID=XX selected by the UE200. Upon receiving the on-demand SIB1 request, the 4G or 5G base station 100A sends the requested on-demand SIB1 with the 6G NES Cell ID=XX. The UE200 then receives the on-demand SIB1 with the 6G NES Cell ID=XX sent from the 4G or 5G base station 100A. In this way, the UE200 can obtain the SIB1 of the 6G base station 100B with the 6G NES Cell ID=XX selected by the UE200 from the 4G or 5G base station 100A and access the 6G anchor cell of the 6G base station 100B.

[0102] Thus, according to options 1E and 1F, when accessing a 6G anchor cell from a 4G or 5G cell, the UE200 can obtain SIB1 information for the 6G base station 200B, which applies on-demand SIB1 based on NES-related information, from the 4G or 5G base station 100A or the 6G base station 100B, and access the 6G anchor cell directly.

[0103] (4.2.2) Operation Example 2 Figure 14 shows a second embodiment, in which a perch carrier is introduced in 6G. In Figure 14, the 6G cell consists of a perch cell with wide coverage and an anchor cell with narrow coverage, and the 6G cell covers a portion of the area of ​​a 4G or 5G cell. From an NES perspective, the 6G anchor cell may not transmit SSB or SIB (e.g., SIB1), or may have a longer transmission period. Also, 6G anchor cells that do not provide communication services may be turned off. In such cases, the 6G base station 100B that provides the perch cell transmits NES-related information for the 6G anchor cell in the perch cell.

[0104] A 6G base station 100B providing a parch cell may receive NES-related information for a 6G anchor cell from another 6G base station 100B providing a 6G anchor cell. Furthermore, a 6G base station 100B providing a 6G anchor cell may transmit NES-related information for a 6G anchor cell to another 6G base station 100B providing a parch cell. A 6G base station 100A providing a parch cell may request NES-related information for a 6G anchor cell from another 6G base station 100B providing a 6G anchor cell. Upon receiving a request for NES-related information for a 6G anchor cell, a 6G base station 100B providing a parch cell may transmit NES-related information for a 6G anchor cell to another 6G base station 100B providing a parch cell.

[0105] Option 2A) Figure 15 shows the first sequence in the second embodiment. In Figure 15, the 4G or 5G base station 100A transmits an SIB or RRC message to the UE200 containing information related to the parch cell as 6G cell-related information. The UE200 performs a cell search for the parch cell based on the parch cell-related information and accesses the parch cell. The 6G base station 100B providing the parch cell broadcasts an SIByy in the parch cell containing NES-related information for the 6G anchor cell. The UE200 receives the NES-related information for the 6G anchor cell from the SIByy broadcast in the parch cell, selects the 6G anchor cell based on the NES-related information, and accesses the 6G anchor cell.

[0106] Thus, according to Option 2A, the UE200 can receive not only 6G anchor cell information but also NES-related information for that 6G anchor cell in the parch cell. This allows the UE200 to select a 6G anchor cell based on the NES-related information received in the parch cell when accessing a 6G anchor cell from a 4G or 5G cell, and to access the 6G anchor cell indirectly via the parch cell.

[0107] Option 2B) Figure 16 shows the second sequence in the second embodiment. In Figure 16, the process is the same as in Option 2A until the UE200 accesses the parchment cell and receives an SIB containing NES-related information for the 6G anchor cell in the parchment cell. Figure 16 shows the sequence in which the UE200 uses the WUS information contained in the received NES-related information to directly obtain an SIB from the 6G base station 100B, which is a 6G NES cell and provides a 6G anchor cell, and accesses the 6G anchor cell.

[0108] The UE200 receives NES-related information for the 6G anchor cell from the 6G base station 100B that provides the parchment cell. This NES-related information includes WUS information for the RACH resource for on-demand SIB1 requests for the 6G anchor cell that supports on-demand SIB1. In this example, the WUS information is the same as option 1E described above.

[0109] For example, UE200 selects 6G NES Cell ID=XX and sends an on-demand SIB1 request to 6G base station 100B with 6G NES Cell ID=XX using RACH resource X. 6G base station 100B with 6G NES Cell ID=XX receives the on-demand SIB1 request and sends an on-demand SIB1. UE200 then receives the on-demand SIB1 sent from 6G base station 100B with 6G NES Cell ID=XX. In this way, UE200 obtains the SIB1 and can access the 6G anchor cell of 6G base station 100B with 6G NES Cell ID=XX.

[0110] Option 2C) Figure 17 shows the third sequence in the second embodiment. In Figure 17, the process is the same as in Option 2B until the UE200 accesses the parchment cell from a 4G or 5G cell and receives an SIB containing NES-related information for the 6G anchor cell in the parchment cell. Figure 17 shows the sequence in which the UE200 uses the WUS information contained in the received NES-related information to indirectly obtain the SIB1 of the 6G base station 100B of the 6G NES cell from the 6G base station 100B providing the parchment cell and accesses the 6G anchor cell.

[0111] The UE200 receives NES-related information for the 6G anchor cell from the 6G base station 100B, which provides the parchment cell. This NES-related information includes WUS information for the RACH resource for on-demand SIB1 requests for the 6G anchor cell that supports on-demand SIB1.

[0112] In Figure 17, unlike option 2B, the UE200 sends an on-demand SIB1 request to the 6G base station 100B that provides the parch cell that transmitted the NES-related information, using the RACH resource X with the 6G NES Cell ID=XX selected by the UE200. Upon receiving the on-demand SIB1 request, the 6G base station 100B providing the parch cell transmits the on-demand SIB1 in the parch cell. The UE200 then receives the on-demand SIB1 with the 6G NES Cell ID=XX transmitted from the 6G base station 100B providing the parch cell. In this way, the UE200 can obtain the SIB1 of the 6G base station 100B with the 6G NES Cell ID=XX selected by the UE200 and access the 6G anchor cell of the 6G base station 100B with the 6G NES Cell ID=XX.

[0113] Thus, according to options 2B and 2C, when accessing a 6G anchor cell from a 4G or 5G cell, the UE200 indirectly obtains the SIB1 information of the 6G base station 200B to which on-demand SIB1 is applied, based on the NES-related information received in the parch cell, from the 6G base station 100B providing the parch cell, or directly from the 6G base station 100B to which on-demand SIB1 is applied. This allows the UE200 to indirectly access the 6G anchor cell via the parch cell.

[0114] Even if a perch carrier is introduced, if a 4G or 5G base station 100A transmits NES-related information as part of 6G cell-related information, or as an information element separate from 6G cell-related information, the UE200 may access the 6G anchor cell directly without going through the perch carrier, as described in options 1A to 1F.

[0115] (5) Effects and Effects As described above, according to the embodiment, the UE200 can select a 6G cell that is transmitting the necessary signals (SSB, SIB1, etc.) to access the 6G cell based on NES-related information, and can quickly and reliably access the 6G cell even in a network where NES is applied.

[0116] Furthermore, according to the embodiment, the 4G or 5G base station 100A causes the UE200 to acquire NES-related information, allowing the UE200 to select a 6G cell that is transmitting the necessary signals (SSB, SIB1, etc.) to access the 6G cell, thereby enabling rapid and reliable access to the 6G cell even in a network where NES is applied.

[0117] (6) Other Embodiments Although the contents of the present invention have been described above in accordance with the embodiments, it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0118] In the above explanation, an example was shown in which the 4G base station 100A transmits NES-related information as existing SIB24 information; however, it may also transmit it using a newly defined SIB instead of SIB24.

[0119] In this disclosure, multiple options and variations may be combined as a single option / variation.

[0120] The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining software with the one or more of the above devices.

[0121] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0122] For example, the base station 100 and terminal 200 in one embodiment of the present disclosure may function as computers that process the wireless communication method of the present disclosure. Figure 18 is a diagram showing an example of the hardware configuration of the base station 100 and terminal 200 according to one embodiment of the present disclosure. The above-mentioned base station 100 and terminal 200 may be physically configured as computer devices including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0123] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 100 and terminal 200 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0124] Each function in the base station 100 and terminal 200 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0125] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, and so on.

[0126] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. Furthermore, although it has been explained that the above processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line.

[0127] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of the present disclosure.

[0128] The storage 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., Compact Disc, Digital Multipurpose Disc, Blu-ray® Disc), a smart card, flash memory (e.g., a card, stick, key drive), a floppy® disk, a magnetic strip, etc. The storage 1003 may also be called an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0129] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0130] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0131] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0132] Furthermore, the base station 100 and terminal 200 may 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), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0133] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or combinations thereof. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0134] Each aspect / embodiment described herein may apply to systems utilizing Long Term Evolution (LTE), LTE-Advanced (LTE-A), 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) (where x is, for example, an integer or decimal), Future Radio Access (FRA), New Radio (NR), New radio access (NX), Future generation radio access (FX), W-CDMA®, GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other appropriate systems, as well as at least one of the next-generation systems that are extended, modified, created, or defined based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0135] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be reordered, provided they do not contradict each other. For example, the methods described in this disclosure present various step elements using exemplary order and are not limited to the specific order presented.

[0136] The specific operations described in this disclosure as being performed by a base station may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station and at least one other network node (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station, it may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0137] Information and signals (such as data) can be output from a higher layer (or lower layer) to a lower layer (or higher layer). Input and output may occur via multiple network nodes.

[0138] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0139] The determination may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, by comparing with a predetermined value).

[0140] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0141] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0142] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0143] The information, signals, etc. described in this disclosure may be represented using any of the various different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0144] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0145] The terms “system” and “network” as used in this disclosure are interchangeable.

[0146] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0147] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0148] In this disclosure, terms such as "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" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0149] A base station can house one or more (e.g., three) cells (also called sectors). If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which may be provided with communication services by a base station subsystem (e.g., a Remote Radio Head, RRH). The terms "cell" or "sector" refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems providing communication services in that coverage.

[0150] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform control or operation based on the information.

[0151] In this disclosure, terms such as “terminal,” “user terminal,” “Mobile Station (MS),” and “User Equipment (UE)” may be used interchangeably.

[0152] A mobile station may also be referred to by those skilled in the art as a 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, handset, user agent, mobile client, client, or several other appropriate terms.

[0153] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object, and its speed of movement is arbitrary. This also includes the case when the mobile body is stationary. The mobile body includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and items mounted on them. The mobile body may also be a mobile body that moves autonomously based on operation commands. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0154] Furthermore, the term "base station" in this disclosure may be interpreted as "terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between multiple terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the terminal 200 may have the functions that the base station 100A or 100B has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0155] Similarly, the term "terminal" in this disclosure may be replaced with "base station." In this case, the functions of the terminal 200 described above may be provided by the base station 100A or 100B.

[0156] Figure 19 shows an example of the configuration of vehicle 2001. As shown in Figure 19, vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a 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.

[0157] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

[0158] The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0159] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2027 installed in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an Electronic Control Unit (ECU).

[0160] Signals from various sensors 2021 to 2029 include current signals from the current sensor 2021 that senses motor current, front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0161] The Information Services Unit 2012 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including car navigation systems, audio systems, speakers, televisions, and radios, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via communication modules 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001.

[0162] The Information Services Unit 2012 may include input devices that accept input from external sources (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) and output devices that output to external sources (e.g., displays, speakers, LED lamps, touch panels, etc.).

[0163] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), Artificial Intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0164] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via the communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2029 provided in the vehicle 2001.

[0165] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0166] The communication module 2013 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 2021 to 2029 input to the electronic control unit 2010, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021 to 2029, the information service unit 2012, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0167] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on the information service unit 2012 installed in the vehicle. The information service unit 2012 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013).

[0168] Furthermore, the communication module 2013 stores various information received from external devices in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021 to 2029, etc., which are provided in the vehicle 2001.

[0169] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, or inquiring (e.g., searching in a table, database, or other data structure), or ascertaining. “Determining” may also include receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, or accessing (e.g., accessing data in memory). Furthermore, “determining” may include resolving, selecting, choosing, establishing, or comparing. In other words, "judgment" and "decision" can include considering that some action has been "judged" or "decided." Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0170] The terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0171] The reference signal may also be abbreviated as RS and may be called Pilot depending on the applicable standard.

[0172] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0173] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0174] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0175] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0176] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0177] Numerology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerology may include, for example, 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 configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0178] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). A slot may also be a time unit based on neurology.

[0179] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (or PUSCH) mapping type B.

[0180] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0181] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1 to 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0182] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal to allocate radio resources (such as the frequency bandwidth and transmission power available to each terminal) in TTI units. However, the definition of TTI is not limited to this.

[0183] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the actual time interval (e.g., number of symbols) in which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0184] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0185] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in LTE Rel. 8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a subslot, or a slot.

[0186] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0187] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0188] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0189] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0190] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0191] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. The PRBs may be defined and numbered within a given BWP.

[0192] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be configured within a single carrier for a UE.

[0193] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0194] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0195] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0196] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0197] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way.

[0198] 10 Wireless communication system 10A First network 10B Second network 20A, 20B Wireless access network 30A, 30B Core network 40A First area 40B Second area 100A, 100B Base station 110 Wireless communication unit 120 NES-related information provision unit 130 Control unit 200 Terminal 210 Wireless communication unit 220 Cell selection / re-selection execution unit 230 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic Control Unit 2012 Information Service Unit 2013 Communication Module 2021 Current Sensor 2022 Rotation Speed ​​Sensor 2023 Pneumatic Sensor 2024 Vehicle Speed ​​Sensor 2025 Acceleration Sensor 2026 Brake Pedal Sensor 2027 Shift Lever Sensor 2028 Object Detection Sensor 2029 Accelerator Pedal Sensor 2030 Driving Assistance System Unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication Port (IO Port)

Claims

1. A terminal comprising a control unit that accesses a cell of a second wireless access technology from a cell of a first wireless access technology, and a receiving unit that receives information regarding network energy saving (NES) applied to the cell of the second wireless access technology, wherein the control unit accesses the cell of the second wireless access technology based on the information.

2. The terminal according to claim 1, wherein the receiving unit receives prior information in the cell of the first wireless access technology.

3. The terminal according to claim 1, wherein the receiving unit receives the information in the cell of the second wireless access technology.

4. A communication method comprising the steps of: accessing a cell of a second wireless access technology from a cell of a first wireless access technology; receiving information regarding the network energy saving (NES) of the cell of the second wireless access technology; and accessing the cell of the second wireless access technology based on the information.

5. A base station comprising: a transmitting unit that transmits information relating to network energy saving (NES) of a cell of a second radio access technology in a cell of a first radio access technology; and a control unit that transmits the said information as broadcast information to be broadcast in the cell of the first radio access technology, or as a radio resource control message.

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