User device and communication method

Abstract

This user device performs wireless communication with a node in a mobile communication system. the user device comprises: a reception unit that receives synchronization signal block-specific information from the node; and a control unit that performs beam selection on the basis of the synchronization signal block-specific information. The synchronization signal block-specific information is related to green operation of communication corresponding to a synchronization signal block (SSB) which was used for the transmission of the synchronization signal block-specific information.

Description

User device and communication method

[0001] The present invention relates to a user device and a communication method.

[0002] The 3rd Generation Partnership Project (3GPP (registered trademark; the same applies hereinafter)), a standardization project for mobile communication systems, is scheduled to formulate standards for the sixth generation (6G). Meanwhile, in recent years, in order to achieve sustainability, society as a whole is being called upon to achieve carbon neutrality, i.e., virtually zero greenhouse gas emissions. With the aim of achieving carbon neutrality, efforts are being made throughout society to shift from fossil fuels to renewable energy (a decarbonized society). Furthermore, Green Transformation (GX), an effort to transform the economy and society through efforts aimed at a decarbonized society, is being undertaken throughout society. Conventional mobile communication systems did not take GX into consideration.

[0003] 3GPP Technical Specification: TS 38.304 V18.1.0 (2024-04) 3GPP Technical Specification: TS 38.321 V18.1.0 (2024-04) 3GPP Technical Specification: TS 38.331 V18.1.0 (2024-01)

[0004] A user device according to a first aspect is a user device that performs wireless communication with a node in a mobile communication system, and is equipped with a receiving unit that receives synchronization signal block specific information from the node, and a control unit that performs beam selection based on the synchronization signal block specific information, wherein the synchronization signal block specific information is information regarding the green operation of communication corresponding to the synchronization signal block (SSB) used to transmit the synchronization signal block specific information.

[0005] A communication method according to a second aspect is a communication method used by a user device that performs wireless communication with a node in a mobile communication system, and includes a receiving step of receiving synchronization signal block specific information from the node, and a control step of performing beam selection based on the synchronization signal block specific information, wherein the synchronization signal block specific information is information regarding the green operation of communication corresponding to the synchronization signal block (SSB) used to transmit the synchronization signal block specific information.

[0006] FIG. 1 is a diagram showing an overview of a mobile communication system according to an embodiment. FIG. 2 is a diagram showing an example of the configuration of a mobile communication system according to an embodiment. FIG. 3 is a diagram showing an example of the configuration of a protocol stack of a radio interface of a U-plane that handles data. FIG. 4 is a diagram showing an example of the configuration of a protocol stack of a radio interface of a C-plane that handles signaling (control signals). FIG. 5 is a diagram showing an example of the configuration of a UE (user equipment) according to an embodiment. FIG. 6 is a diagram showing an example of the configuration of a node according to an embodiment. FIG. 7 is a diagram showing an example of the system operation according to a first embodiment. FIG. 8 is a diagram showing an example of the system operation according to a second embodiment. FIG. 9 is a diagram showing an example of the system operation according to a third embodiment. FIG. 10 is a diagram showing an example of the system operation according to a fourth embodiment.

[0007] Hereinafter, a mobile communication system according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

[0008] (1) First Embodiment A first embodiment will be described with reference to FIGS. 1 to 7. FIG.

[0009] (1.1) System Overview FIG. 1 is a diagram illustrating an overview of a mobile communication system according to an embodiment. A user equipment (UE) 100 performs wireless communication with a node 200. The node 200 routes user data. The user data is data transmitted and received between the UE 100 and a data center. In the example illustrated in FIG. 1 , the data center includes a data center 410 and a data center 420. The data center 410 is operated using non-sustainable energy. The data center 420 is operated using sustainable energy. Sustainable energy is renewable energy that uses, for example, solar or wind power, and has zero or less CO2 emissions than fossil fuels. Non-sustainable energy is, for example, electricity generated using fossil fuels, such as thermal power generation.

[0010] Assume that the UE 100 can select a network to use from multiple networks. In this case, it is considered that the UE 100 can contribute to sustainability such as decarbonization by routing user data to the data center 420 that operates on as sustainable energy as possible. In the sixth generation (6G) standards to be formulated by 3GPP in the future, there is a possibility that technology and standard specifications will be developed using indicators such as sustainability, GX, and carbon neutrality as a direction different from the conventional approach of reducing the power consumption of devices such as the UE 100 or the node 200 themselves.

[0011] In this embodiment, the green communication mode is one of the operation modes of the UE 100, and is an operation mode in which the UE cooperates with the communication system to realize a sustainable mobile communication system. A sustainable mobile communication system is, for example, a mobile communication system that operates using sustainable energy at a predetermined rate or more. In the following description, sustainable energy will also be referred to as green energy. Non-sustainable energy will also be referred to as non-green energy. Note that the green communication mode may include an operation mode aimed at reducing power consumption of the UE 100 (UE power saving (PS)). Furthermore, the green communication mode may include an operation mode aimed at reducing power consumption of the network (Energy Saving (ES) or Network Energy Saving (NES)).

[0012] UE cooperative green communication is a sustainable communication method that includes a green communication mode, and is also simply referred to as green communication.

[0013] The green priority information is information indicating a desire to execute a green communication mode or UE-cooperative green communication. Alternatively, the green priority information is information for executing UE-cooperative green communication. Alternatively, the green priority information is information indicating a desire to execute a green communication mode or UE-cooperative green communication, and information for executing UE-cooperative green communication. Note that the green priority information is also referred to as Green Preference.

[0014] The green operation information is, for example, information indicating an index of an operation state using green energy. The green operation information is one type of network operation information, and may be any one or more of information indicating an index of an operation state using green energy, information indicating an index of a power-saving operation state, information indicating an index of an operation state using non-green energy, and information indicating an index of a non-power-saving operation state.

[0015] (1.2) System Configuration Example Fig. 2 is a diagram showing a configuration example of a mobile communication system according to an embodiment. The mobile communication system according to the embodiment is a system conforming to the 3GPP standard. For example, the mobile communication system according to the embodiment may be a fifth generation (5G) system or a sixth generation (6G) system.

[0016] The mobile communication system includes a network (NW) 1 and a user equipment (UE) 100. The UE 100 is a mobile communication device that performs wireless communication with the NW 1. The UE 100 may be any device used by a user, such as a mobile phone terminal (including a smartphone), a tablet terminal, a notebook PC (Personal Computer), a communication module (including a communication card or chipset), a sensor or a device provided in a sensor, a vehicle or a device provided in a vehicle (Vehicle UE), or an aircraft or a device provided in an aircraft (Aerial UE). The UE 100 may be a Mobile Termination (MT) of a relay device such as an Integrated Access and Backhaul (IAB) or a Network-Controlled Repeater (NCR).

[0017] NW1 includes a radio access network (RAN) 10 and a core network (CN) 20. When the mobile communication system is a 5th generation system (5GS), the RAN 10 is referred to as a Next Generation Radio Access Network (NG-RAN), and the CN 20 is referred to as a 5G Core Network (5GC).

[0018] The RAN 10 includes a plurality of nodes 200 (nodes 200a to 200c in the illustrated example). The nodes 200 are connected to each other via inter-node interfaces. The nodes 200 are also referred to as base stations. The nodes 200 may be configured (i.e., functionally divided) with a CU (Central Unit) and a DU (Distributed Unit), and the two units may be connected by a fronthaul interface. When the mobile communication system is 5GS, the nodes 200 are referred to as gNBs, the inter-node interface is referred to as an Xn interface, and the fronthaul interface is referred to as an F1 interface.

[0019] Each node 200 manages one or more cells. Each node 200 performs wireless communication with a UE 100 that has established a connection with its own cell. Each node 200 has a radio resource management (RRM) function, a routing function for user data (also simply referred to as "data"), a measurement control function for mobility control and scheduling, and the like. Note that "cell" is used as a term indicating the smallest unit of a wireless communication area. "Cell" is also used as a term indicating a function or resource for performing wireless communication with a UE 100. One cell belongs to one carrier frequency (also simply referred to as "frequency").

[0020] The CN 20 includes a plurality of CN devices 300 (in the illustrated example, CN devices 300a to 300c). The CN devices 300 may include a C-plane device corresponding to the control plane (C-plane) and a U-plane device corresponding to the user plane (U-plane). The C-plane device performs various mobility controls and paging for the UE 100. The C-plane device communicates with the UE 100 using NAS (Non-Access Stratum) signaling. The U-plane device controls data transfer. When the mobile communication system is 5GS, the C-plane device is referred to as an AMF (Access and Mobility Management Function), the U-plane device is referred to as a UPF (User Plane Function), and the interface between the node 200 and the CN device 300 is referred to as an NG interface.

[0021] The UE 100 can reselect one or more cells managed by multiple nodes 200. The node 200 can select or connect to multiple CN devices 300. The multiple nodes 200 and the multiple CN devices 300 each operate on either green energy or non-green energy. The multiple nodes 200 and the multiple CN devices 300 each operate on a combination of green energy and non-green energy in a predetermined ratio. For example, the CU and DU constituting the node 200, as well as the CN device 300, are virtualized and run in a data center that operates on different power sources. Furthermore, the data centers may not only differ from each other in power sources but also in performance (e.g., delay depending on distance). These cells, nodes 200, and CN devices 300 do not necessarily need to be connectable from the UE 100. In other words, there may be limitations on the available combinations (e.g., data paths).

[0022] FIG. 3 is a diagram showing an example of the configuration of a protocol stack of a U-plane radio interface that handles data.

[0023] The U-plane radio interface protocol includes, for example, a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer.

[0024] The PHY layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data and control information are transmitted between the PHY layer of UE 100 and the PHY layer of node 200 via a physical channel. The PHY layer of UE 100 receives downlink control information (DCI) transmitted from node 200 on a physical downlink control channel (PDCCH). Specifically, UE 100 performs blind decoding of the PDCCH using a radio network temporary identifier (RNTI) and acquires successfully decoded DCI as DCI addressed to the UE. The DCI transmitted from node 200 has CRC parity bits scrambled by the RNTI added.

[0025] The MAC layer performs data priority control and retransmission processing using Hybrid ARQ (HARQ). Data and control information are transmitted between the MAC layer of UE 100 and the MAC layer of node 200 via a transport channel. The MAC layer of node 200 includes a scheduler. The scheduler determines the uplink and downlink transport format (transport block size, modulation and coding scheme (MCS)) and the resources to be allocated to UE 100.

[0026] The RLC layer performs automatic repeat request (ARQ) and segmentation / reassembly of transmission data. The RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and PHY layer. Data and control information are transmitted between the RLC layer of UE 100 and the RLC layer of node 200 via logical channels.

[0027] The PDCP layer performs header compression / decompression, encryption / decryption, and the like.

[0028] The SDAP layer maps IP flows (also called QoS flows), which are units for QoS control by the CN 20, to radio bearers, which are units for QoS control by the AS (Access Stratum). Note that if the RAN is connected to the EPC, SDAP may not be required.

[0029] FIG. 4 is a diagram showing an example of the configuration of a protocol stack of a C-plane radio interface that handles signaling (control signals).

[0030] The protocol stack of the C-plane radio interface includes, for example, an RRC (Radio Resource Control) layer and an NAS (Non-Access Stratum) layer instead of the SDAP layer shown in FIG.

[0031] RRC signaling for various settings is transmitted between the RRC layer of UE100 and the RRC layer of node 200. The RRC layer controls logical channels, transport channels, and physical channels in accordance with the establishment, re-establishment, and release of radio bearers. When there is a connection (RRC connection) between the RRC of UE100 and the RRC of node 200, UE100 is in an RRC connected state. When there is no connection (RRC connection) between the RRC of UE100 and the RRC of node 200, UE100 is in an RRC idle state. When the connection between the RRC of UE100 and the RRC of node 200 is suspended, UE100 is in an RRC inactive state.

[0032] The NAS layer (also simply referred to as "NAS") located above the RRC layer performs session management, mobility management, etc. NAS signaling is transmitted between the NAS layer of the UE 100 and the NAS layer of the CN device 300. Note that the UE 100 also has an application layer in addition to the radio interface protocol. The layer below the NAS layer is referred to as the AS layer (also simply referred to as "AS").

[0033] (1.3) Example of Configuration of User Equipment FIG. 5 is a diagram illustrating an example of the configuration of the UE 100 (user equipment) according to the embodiment.

[0034] The UE 100 includes a receiving unit 110, a transmitting unit 120, and a control unit 130. The receiving unit 110 and the transmitting unit 120 configure a wireless communication unit 140 that performs wireless communication with the node 200.

[0035] The receiving unit 110 performs various receptions under the control of the control unit 130. The receiving unit 110 includes an antenna and a receiver. The receiver converts a radio signal received by the antenna into a baseband signal (received signal) and outputs it to the control unit 130. The transmitting unit 120 performs various transmissions under the control of the control unit 130. The transmitting unit 120 includes an antenna and a transmitter. The transmitter converts a baseband signal (transmitted signal) output by the control unit 130 into a radio signal and transmits it from the antenna.

[0036] The control unit 130 performs various controls and processes in the UE 100. The operations of the UE 100 described above and below may be operations controlled by the control unit 130. The control unit 130 includes at least one processor and at least one memory. The memory stores programs executed by the processor and information used in the processing by the processor. The processor may include a baseband processor and a CPU (Central Processing Unit). The baseband processor performs modulation / demodulation and encoding / decoding of baseband signals. The CPU executes programs stored in the memory to perform various processes.

[0037] The control unit 130 includes an application processing unit 131, a NAS processing unit 132, and an AS processing unit 133. The application processing unit 131, the NAS processing unit 132, and the AS processing unit 133 are each realized as a program executed by a processor. The application processing unit 131 performs processing of the application layer. The application layer is provided above the NAS layer. The NAS processing unit 132 performs processing of the NAS layer. The AS processing unit 133 performs processing of the AS layer.

[0038] The UE 100 also includes an operation unit (not shown). The operation unit receives operations from a user. The operation unit includes, for example, a touch panel.

[0039] The UE 100 configured in this manner performs wireless communication with the node 200 in a mobile communication system. The receiving unit 110 receives from the node 200 a plurality of pieces of cell reselection priority information, each piece of cell reselection priority information indicating the priority of one or more cells in cell reselection. When instruction information for selecting one piece of cell reselection priority information is notified from a processing unit in a higher layer, the AS processing unit 133 selects one piece of cell reselection priority information from the plurality of pieces of cell reselection priority information in accordance with the instruction information. The AS processing unit 133 is an example of a first processing unit. The processing unit in the higher layer is, for example, the NAS processing unit 132. The NAS processing unit 132 is an example of a second processing unit that performs processing of a second layer that is provided above the first layer in which the first processing unit performs processing. Therefore, the NAS processing unit 132 notifies the AS processing unit 133 of the instruction information. With the above configuration, the UE 100 can contribute to GX in the mobile communication system.

[0040] In one example of this embodiment, one of the plurality of pieces of cell reselection priority information is cell reselection priority information for performing communication based on the green communication mode. Also, in one example of this embodiment, the instruction information notified from the NAS processing unit 132 to the AS processing unit 133 is green priority information.

[0041] (1.4) Example of Node Configuration FIG. 6 is a diagram illustrating an example of the configuration of a node 200 (base station, gNB) according to an embodiment.

[0042] The node 200 includes a transmitting unit 210, a receiving unit 220, a control unit 230, and a NW communication unit 240. The transmitting unit 210 and the receiving unit 220 configure a wireless communication unit 250 that performs wireless communication with the UE 100.

[0043] The transmitting unit 210 performs various transmissions under the control of the control unit 230. The transmitting unit 210 includes an antenna and a transmitter. The transmitter converts a baseband signal (transmission signal) output by the control unit 230 into a radio signal and transmits it from the antenna. The receiving unit 220 performs various receptions under the control of the control unit 230. The receiving unit 220 includes an antenna and a receiver. The receiver converts a radio signal received by the antenna into a baseband signal (reception signal) and outputs it to the control unit 230.

[0044] The control unit 230 performs various controls and processes in the node 200. The operations of the node 200 described above and below may be operations under the control of the control unit 230. The control unit 230 includes at least one processor and at least one memory. The memory stores programs executed by the processor and information used in the processing by the processor. The processor may include a baseband processor and a CPU. The baseband processor performs modulation / demodulation and encoding / decoding of baseband signals. The CPU executes programs stored in the memory to perform various processes.

[0045] The NW communication unit 240 is connected to adjacent nodes via an inter-node interface, and to the CN device 300 via a node-CN interface.

[0046] The node 200 configured in this manner performs wireless communication with the UE 100 in the mobile communication system. The transmitter 210 transmits to the UE 100 cell reselection priority information, which is a plurality of pieces of information and indicates the priority of a cell in cell reselection.

[0047] (1.5) System Operation Example Fig. 7 is a diagram showing a system operation example according to the first embodiment. In the system operation according to the first embodiment, cell reselection priority information for performing communication based on the green communication mode is broadcast from the node 200 to the UE 100.

[0048] In step S10, the AS processing unit 133 is in an RRC idle state. Alternatively, the AS processing unit 133 may be in an RRC inactive state.

[0049] In step S20, the upper layer processing unit 150 notifies the green priority information to the AS processing unit 133. The upper layer processing unit 150 is, for example, the NAS processing unit 132.

[0050] For example, when the operation unit receives an operation for performing communication based on the green communication mode, the NAS processing unit 132 notifies the AS processing unit 133 of the green priority information. The operation for performing communication based on the green communication mode is, for example, an operation for turning on a green communication mode button on a touch panel included in the operation unit (for example, tapping).

[0051] As another example, the NAS processing unit 132 may notify the AS processing unit 133 of green priority information when it receives a notification from the application processing unit 131. A notification from the application processing unit 131 to the NAS processing unit 132 is also green priority information. For example, the application processing unit 131 notifies the NAS processing unit 132 when a service provider (server) notifies the NAS processing unit 132 of a reconfiguration of an application installed in the UE 100 or an update of the application. Furthermore, the application processing unit 131 may notify the NAS processing unit 132 when the operation unit receives an operation by the user to turn on a green communication mode button on the application.

[0052] As another example, when the NAS processing unit 132 attempts to establish a PDU (Protocol Data Unit) session corresponding to a slice targeted by the green communication mode, the NAS processing unit 132 may notify the AS processing unit 133 of green priority information. In this case, the NAS processing unit 132 notifies the AS processing unit 133 of, for example, a slice identifier or a slice group identifier and the green priority information associated therewith. Here, the slice identifier is, for example, NSSAI (Network Slice Selection Assistance Information), S-NSSAI (Single Network Slice Selection Assistance Information), SST (Slice and Service Type), or SD (Slice Differentiator). The slice group identifier is, for example, an NSAG ID.

[0053] The green priority information notified by the NAS processing unit 132 when the NAS processing unit 132 attempts to establish a PDU session corresponding to a slice that is the target of the green communication mode may be information indicating whether the slice or slice group is the target of the green communication mode. The information may be, for example, 1-bit information. The green priority information may also be the targeted or required green utilization rate of the slice or slice group. For example, the green priority information may indicate that the targeted or required renewable energy utilization rate for the slice or slice group is equal to or greater than a predetermined percentage (e.g., 50%).

[0054] When the NAS processing unit 132 attempts to establish a PDU session corresponding to the target slice of the green communication mode, and the NAS processing unit 132 notifies the AS processing unit 133 of green priority information, when the green priority information is notified from the application processing unit 131 to the NAS processing unit 132, the NAS processing unit 132 notifies the AS processing unit 133 of the green priority information.

[0055] The NAS processing unit 132 may notify the AS processing unit 133 of the green priority information based on a policy. For example, a policy may be downloaded in advance from the CN device 300 to the UE 100 in accordance with a subscription (contract), and the NAS processing unit 132 may notify the AS processing unit 133 of the green priority information in accordance with the policy. The policy may be, for example, a green communication policy indicating that communication will be performed based on the green communication mode. The NAS processing unit 132 may notify the AS processing unit 133 of the green priority information at the time the policy is downloaded or at a predetermined time after the download is completed, or at the time a Service Request (communication session establishment request) is attempted to be performed in accordance with the policy.

[0056] In the illustrated example, a case is described in which the AS processing unit 133 is in an RRC idle state or an RRC INACTIVE state, but the RRC idle state or the RRC INACTIVE state may be a state in which the AS processing unit 133 transitions to the RRC idle state or the RRC INACTIVE state after communication between the AS processing unit 133 and the AMF is performed. In that case, the NAS processing unit 132 may notify the AS processing unit 133 of the green priority information at the time when the NAS processing unit 132 notifies the AMF of the green priority information.

[0057] Furthermore, the NAS processing unit 132 may notify the AS processing unit 133 of green priority information when green communication is permitted by the AMF. Here, the AMF permits green communication by referring to a subscription, for example. The AMF may permit green communication based on the green priority information from the NAS processing unit 132.

[0058] Furthermore, the NAS processing unit 132 may notify the AS processing unit 133 of the green priority information when the AS processing unit 133 connects to an AMF that supports green communication, or when the UE 100 registers its location in a tracking area (TA) that supports green communication. Supporting green communication means being compatible with green communication or having the ability to perform green communication. Furthermore, when the NAS processing unit 132 receives a notification from the AMF that green communication is supported, it may notify the AS processing unit 133 of the green priority information.

[0059] When the AS processing unit 133 receives green priority information from the upper layer processing unit 150, it switches its own communication mode from the normal communication mode to the green communication mode. That is, the AS processing unit 133 switches its own communication mode from the normal communication mode to the green communication mode depending on whether or not it has received green priority information from the upper layer processing unit 150. Note that the green priority information notified to the AS processing unit 133 from the upper layer processing unit 150 may be information indicating that communication will be performed based on the green communication mode. In this case, the AS processing unit 133 switches its own communication mode to the green communication mode, which is the communication mode indicated by the green priority information, based on the content of the green priority information notified from the upper layer processing unit 150.

[0060] In step S30, the receiving unit 110 receives a synchronization signal block (SSB) from the node 200. Here, the receiving unit 110 receives the SSB from each of one or more nodes 200. Each of the one or more nodes 200 corresponds to one or more cells. The node 200 repeatedly transmits the SSB at a predetermined period. The SSB includes, for example, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a master information block (MIB).

[0061] In step S40, the receiving unit 110 receives a plurality of pieces of cell reselection priority information from the node 200. Here, the node 200 transmits the plurality of pieces of cell reselection priority information by including them in a system information block (SIB). Therefore, the receiving unit 110 receives the system information block (SIB) including the plurality of pieces of cell reselection priority information from the node 200.

[0062] The node 200 repeatedly transmits an SIB including multiple pieces of cell reselection priority information at a predetermined period. The predetermined period may be variable, or may be the same as the period at which the node 200 transmits an SSB. The node 200 may transmit an SIB including multiple pieces of cell reselection priority information at a predetermined time. In this case, the UE 100 acquires information indicating the predetermined time in advance. The node 200 may also transmit an SIB including multiple pieces of cell reselection priority information based on a request from the UE 100.

[0063] The node 200 may transmit the plurality of pieces of cell reselection priority information by including them in an SIB (SIB1) that the UE 100 receives first among the plurality of SIBs. The node 200 may transmit the plurality of pieces of cell reselection priority information by including them in an SIB other than the SIB that the UE 100 receives first. Furthermore, the node 200 may transmit the plurality of pieces of cell reselection priority information by dividing the plurality of pieces of cell reselection priority information into multiple SIBs. Furthermore, the node 200 may transmit the plurality of pieces of cell reselection priority information by including them in information other than the system information. For example, the node 200 may transmit the plurality of pieces of cell reselection priority information by including them in an MIB. In this case, in step S30, the receiving unit 110 receives an SSB including the plurality of pieces of cell reselection priority information from the node 200. As another example, the node 200 may transmit the plurality of pieces of cell reselection priority information by including them in Dedicated Signaling. In this case, the node 200 transmits a plurality of pieces of cell reselection priority information included in an RRC Release message. The RRC Release message is Dedicated Signaling that instructs the UE to transition from an RRC Connected state to an RRC Idle state or an RRC Inactive state.

[0064] In this embodiment, the plurality of pieces of cell reselection priority information include cell reselection priority information for performing communication based on the green communication mode and cell reselection priority information for performing communication based on the normal communication mode. The plurality of pieces of cell reselection priority information may include cell reselection priority information for performing communication based on the green communication mode or communication based on a communication mode other than communication based on the normal communication mode. The plurality of pieces of cell reselection priority information may not include cell reselection priority information for performing communication based on the green communication mode. The number of types of cell reselection priority information included in the plurality of pieces of cell reselection priority information may be three or more. The order of steps S30 and S40 may be reversed, or step S30 and / or step S40 may be performed before step S20.

[0065] In step S50, the UE 100 performs cell reselection. The UE 100 performs various measurements during cell reselection. For example, the UE 100 measures the received power and / or received quality of a desired wave for each of the current serving cell and a neighboring cell. The neighboring cell may be an intra-frequency neighboring cell, an inter-frequency neighboring cell, or an inter-RAT (Radio Access Technology) neighboring cell.

[0066] As described above, the AS processing unit 133 has switched its own communication mode to the green communication mode, and therefore selects cell reselection priority information for communication based on the green communication mode from among the multiple pieces of cell reselection priority information.

[0067] In an example of this embodiment, the cell reselection priority information for performing communication based on the green communication mode includes one or more of green cell reselection priority information (e.g., RRC parameter cellReselectionPriority for the green communication mode) and green offset information (e.g., RRC parameter q-OffsetFreq for the green communication mode). When the cell reselection priority information for performing communication based on the green communication mode includes both the green cell reselection priority information and the green offset information, the UE 100 uses both the green cell reselection priority information and the green offset information in cell reselection. When the cell reselection priority information for performing communication based on the green communication mode includes only the green cell reselection priority information, the UE 100 uses the green cell reselection priority information in cell reselection. In this case, the UE 100 may also use offset information (RRC parameters q-OffsetFreq and q-OffsetCell for the normal communication mode) included in the cell reselection priority information for performing communication based on the normal communication mode. When only the green offset information is included in the cell reselection priority information for performing communication based on the green communication mode, the UE 100 uses the green offset information in cell reselection. In this case, the UE 100 may also use the priority included in the cell reselection priority information for performing communication based on the normal communication mode (the RRC parameter cellReselectionPriority for the normal communication mode).

[0068] The green reselection priority information is, for example, information in which a priority (RRC parameter cellReselectionPriority) is specified for each frequency. In the green reselection priority information, if the priority of a frequency to which a cell operating on green energy belongs is set high, the UE 100 performs cell reselection by giving priority to the cell operating on green energy.

[0069] The green cell reselection priority information is, for example, information that designates a cell operating on green energy as a high-priority cell. In this case, when a cell indicated by the green cell reselection priority information satisfies a cell reselection criterion, the UE 100 determines that the cell is the cell with the highest priority for cell reselection, and selects the determined cell for cell reselection. Here, the UE 100 may exclude cells other than the cell with the highest priority from candidates for cell reselection. The cell may be designated by a cell ID (e.g., a physical layer cell ID, a cell global identity).

[0070] As another example, the green cell reselection priority information is information that specifies a frequency to which a cell operating on green energy belongs as a high-priority frequency. In this case, the UE 100 determines that the frequency indicated by the green cell reselection priority information is the frequency with the highest priority for cell reselection, and if a cell belonging to the determined frequency satisfies the cell reselection condition, selects the cell in cell reselection. The frequency to which a cell belongs may be the center frequency of the SSB of the cell.

[0071] The green offset information indicates an offset value to be added to an RSRP (Reference Signal Received Power) measurement value for each frequency (for example, RRC parameter dl-CarrierFreq) (for example, RRC parameter q-OffsetFreq). UE100 performs cell reselection using the RSRP measurement value obtained by adding the offset value indicated by the green offset information to the RSRP measurement value measured in the cell of each frequency. As a result, UE100 performs cell reselection by giving a higher priority to cells operating on green energy or frequencies of cells operating on green energy.

[0072] As another example, the green offset information may be information (e.g., RRC parameter q-OffsetCell) indicating an offset value to be added to the RSRP measurement for each cell (e.g., RRC parameter physCellId), where a larger value is set for the offset in a cell operating on green energy than in a cell operating on non-green energy.

[0073] As another example, the green cell reselection priority information may be frequency assist information. The frequency assist information indicates a frequency to which a cell operating on green energy belongs, which is a cell different from the cell on which the UE 100 is currently camped. When performing communication based on the green communication mode, the UE 100 monitors the frequency indicated by the frequency assist information based on the frequency assist information, and if a cell operating on green energy exists at that frequency, determines that frequency as the highest priority. Note that the UE 100 may determine that a frequency operating on green energy is the best cell at that frequency as the highest priority. The best cell is, for example, any of the cell with the largest RSRP, the cell with the largest RSRQ (Reference Signal Received Quality), and the cell with the largest SINR (Signal-to-Noise Ratio) at that frequency.

[0074] As another example, the green cell reselection priority information may be cell assist information. The cell assist information may indicate a list of cells (e.g., a list of neighboring cells) that are powered by green energy. The cell assist information may be provided on a frequency-by-frequency basis.

[0075] When the AS processing unit 133's own communication mode is the normal communication mode, the AS processing unit 133 selects cell reselection priority information for performing communication based on the normal communication mode from among the plurality of pieces of cell reselection priority information. The cell reselection priority information for performing communication based on the normal communication mode is, for example, information specifying a cell with a high priority or a frequency with a high priority. The cell reselection priority information for performing communication based on the normal communication mode may indicate an offset value to be added to the RSRP measurement value for a specific cell or a specific frequency.

[0076] In step S60, UE 100 performs beam selection. UE 100 selects beams transmitted in the cell selected in cell reselection. UE 100 measures RSRP for each beam to be selected. UE 100 selects the beam with the largest measured RSRP from among the beams to be selected. Note that beam selection may also be referred to as selecting a random access resource (random access resource selection) or selecting an SSB.

[0077] In step S70, the UE 100 transmits a physical random access channel (PRACH) to the node 200. Here, the AS processing unit 133 selects a random access resource (PRACH resource) associated with the selected SSB from the SSBs received from the node 200. The AS processing unit 133 causes the transmitting unit 120 to transmit the PRACH using the selected PRACH resource.

[0078] In step S80, the node 200 transmits a random access response to the UE 100. Here, the node 200 transmits the random access response by including scheduling information indicating the PUSCH resource allocated to the UE 100 in the random access response.

[0079] In step S90, the UE 100 transmits an RRC connection request message to the node 200. Here, the UE 100 transmits the RRC connection request message to the node 200 based on the scheduling information. Alternatively, when the UE 100 is in an RRC INACTIVE state, the UE 100 transmits an RRC resume request to the node 200.

[0080] In step S100, the node 200 transmits an RRC connection message to the UE 100. Alternatively, when an RRC recovery request is received from the UE 100 in step S90, the node 200 may transmit an RRC recovery message to the UE 100.

[0081] The instruction information notified from the NAS processing unit 132 to the AS processing unit 133 may be information indicating that communication based on the green communication mode is to be terminated. In this case, the AS processing unit 133 terminates the green communication mode and switches its own communication mode to the normal communication mode based on the instruction information notified from the upper layer processing unit 150. This switching may be cell reselection using cell reselection priority information for performing communication based on the normal communication mode, or may be handover.

[0082] Furthermore, the instruction information notified from the NAS processing unit 132 to the AS processing unit 133 may be information other than green priority information. The instruction information may be, for example, normal communication priority information or game communication priority information. The normal communication priority information is information indicating that communication will be performed based on the normal communication mode. The game communication priority information is information indicating that communication will be performed based on the game communication mode. In the game communication mode, the UE 100 prioritizes cell reselection that prioritizes performance (data rate and delay amount) over the green energy index, for example. In the game communication mode, the CN device 300 applies a network configuration that prioritizes performance. For example, the CN device 300 assigns a network function (NF) to a nearby fossil fuel data center. This operation by the CN device 300 is performed after RRC connection.

[0083] (2) Second Embodiment With reference to FIG. 8 , the second embodiment will be described, mainly focusing on the differences from the first embodiment. In the second embodiment, cell-specific information related to green operation is broadcast from the node 200 to the UE 100. The cell-specific information is information related to green operation of communication using the cell used to transmit the cell-specific information. According to the UE 100 according to the second embodiment, the receiving unit 110 receives the cell-specific information related to green operation from the node 200. The control unit 130 performs cell reselection based on the cell-specific information.

[0084] (2.1) System Operation Example FIG. 8 is a diagram illustrating an example of system operation according to the second embodiment. In the illustrated example, two nodes 200, node 200a and node 200b, are shown as nodes 200, but the number of nodes 200 may be three or more. Also, in the illustrated example, a case will be described in which a cell corresponding to node 200a is (re)selected as a result of cell reselection. Note that the processes of steps S110, S120, S160, S170, S180, S190, and S1100 are similar to the processes of steps S10, S20, S60, S70, S80, S90, and S100 in FIG. 7, and therefore will not be described again.

[0085] In step S130a, the receiver 110 receives the SSB from the node 200a. The process of step S130a is similar to the process of step S30 in FIG.

[0086] In step S140a, the receiving unit 110 receives cell-specific information related to green operation from the node 200a. Here, the node 200a transmits the cell-specific information in an SIB (e.g., SIB1). Therefore, the receiving unit 110 receives the SIB including the cell-specific information from the node 200a.

[0087] The cell-specific information is information indicating whether or not communication using the cell used to transmit the cell-specific information is green operation. The cell-specific information is, for example, 1-bit information. For example, a value corresponding to the type of power source of the node 200a corresponding to the cell is set in the cell-specific information. For example, the cell-specific information is set to a value of 1 if the node 200a corresponding to the cell is powered by green energy, and set to a value of 0 if the node 200a corresponding to the cell is powered by non-green energy. Note that the cell-specific information may also be information indicating whether or not a data center associated with the cell (or node 200a) is green operation. Therefore, the cell-specific information is information indicating whether or not green operation is being performed for each cell.

[0088] As another example, the cell-specific information may be set to a value of 1 if the node 200a corresponding to the cell is operating in low power consumption mode, and may be set to a value of 0 if the node 200a corresponding to the cell is not operating in low power consumption mode. As another example, the cell-specific information may be set to a value of 1 if the node 200a corresponding to the cell can operate in low power consumption mode, and may be set to a value of 0 if the node 200a corresponding to the cell cannot operate in low power consumption mode.

[0089] As another example, the cell-specific information may be information indicating whether the green energy usage rate in the node 200a corresponding to the cell is equal to or greater than a certain level. For example, suppose a standard is set by a government or the like that a green energy usage rate of a predetermined percentage (e.g., 50%) or greater contributes to sustainability. In this case, the cell-specific information is set to a value of 1 if the renewable energy usage rate in the power sources of the node 200a corresponding to the cell is equal to or greater than the predetermined percentage, and to 0 if the renewable energy usage rate is less than the predetermined percentage.

[0090] In step S130b, the receiver 110 receives an SSB from the node 200b. In step S140b, the receiver 110 receives cell-specific information related to green operation from the node 200b. The processes of step S130b and step S140b differ from the processes of step S130a and step S140a only in whether the various pieces of information received by the UE 100 are transmitted by the node 200a or the node 200b, and therefore detailed description thereof will be omitted. Note that the order of steps S130a and S140a and steps S130b and S140b may be any order.

[0091] In step S150, the UE 100 performs cell reselection. Here, when instruction information for performing cell reselection based on the cell-specific information is notified to the AS processing unit 133 from an upper layer (upper layer processing unit 150), the control unit 130 performs cell reselection based on the cell-specific information.

[0092] The UE 100 determines that the cell whose cell-specific information indicates that it is green operating is the cell with the highest priority in cell reselection, and selects the determined cell in cell reselection. Here, the UE 100 may exclude cells other than the cell with the highest priority from candidates for cell reselection. As another example, the UE 100 may determine that the frequency to which the cell whose cell-specific information indicates that it is green operating belongs is the frequency with the highest priority in cell reselection, and select the cell belonging to the determined frequency in cell reselection.

[0093] The cell-specific information may be an index for green operation for communication using the cell used to transmit the cell-specific information. The index for green operation is, for example, the green energy usage rate in the node 200 corresponding to the cell. When the cell-specific information is an index for green operation, a threshold or target value for the index for green operation may be included in the green priority information notified from the NAS processing unit 132 to the AS processing unit 133 in step S120. The threshold or target value for the index for green operation to be notified to the AS processing unit 133 may be notified from the application processing unit 131 to the NAS processing unit 132.

[0094] The value of the index for green operation may be changed depending on whether the power supply is operating in a low-power mode. For example, the value of the index for green operation may be changed to a larger value if the power supply is operating in a low-power mode, and may be changed to a smaller value if the power supply is not operating in a low-power mode. The value of the index for green operation may be changed depending on whether the power supply can operate in a low-power mode. For example, the value of the index for green operation may be changed to a larger value if the power supply can operate in a low-power mode, and may be changed to a smaller value if the power supply cannot operate in a low-power mode.

[0095] As another example, the indicator for green operation may be spectrum efficiency or cost per bit. The spectrum efficiency may be, for example, the number of transmission bits per unit of CO2 emissions or the number of transmission bits per unit of power consumption. The cost per bit may be, for example, the amount of CO2 emissions per bit or the power consumption per bit.

[0096] If the cell-specific information is an indicator for green operation, in the cell reselection performed in step S150, UE100 compares the value of the indicator for green operation with a threshold or target value for the indicator for green operation to determine whether the cell is a target for green operation.

[0097] The UE 100 determines that the cell determined to be a green operation target is the cell with the highest priority in cell reselection, and selects the determined cell in cell reselection. Here, the UE 100 may exclude cells other than the cell with the highest priority from candidates for cell reselection. As another example, the UE 100 may determine that the frequency to which the cell determined to be a green operation target belongs is the frequency with the highest priority in cell reselection, and select a cell belonging to the determined frequency in cell reselection.

[0098] (3) Third Embodiment With reference to FIG. 9 , the third embodiment will be described, focusing mainly on the differences from the first and second embodiments. In the third embodiment, synchronization signal block-specific information (hereinafter referred to as SSB-specific information) related to green operation is broadcast from the node 200 to the UE 100. The SSB-specific information is information related to green operation of communication corresponding to the SSB used to transmit the SSB-specific information. In the UE 100 according to the third embodiment, the receiver 110 receives the SSB-specific information related to green operation from the node 200. The controller 130 performs beam selection based on the SSB-specific information.

[0099] (3.1) System Operation Example Fig. 9 is a diagram showing an example of system operation according to the third embodiment. Note that the processes of steps S210, S220, S270, S280, S290, and S2100 are similar to the processes of steps S10, S20, S70, S80, S90, and S100 in Fig. 7, and therefore descriptions thereof will be omitted.

[0100] In step S230, the receiving unit 110 receives SSB-specific information related to green operation from the node 200. Here, the node 200 periodically transmits the SSB-specific information by including it in each SSB that it transmits. Therefore, the receiving unit 110 receives an SSB including the SSB-specific information from the node 200. Furthermore, the node 200 transmits an SSB including an MIB including the SSB-specific information by including it in the SSB. Therefore, the receiving unit 110 receives an SSB including an MIB including the SSB-specific information from the node 200. Note that the node 200 may transmit the SSB-specific information by including it in an area of ​​the SSB other than the MIB.

[0101] The beam-specific information is information indicating whether or not green operation is being performed for communication corresponding to the SSB. Therefore, the SSB-specific information is information indicating whether or not green operation is being performed for each SSB. The SSB-specific information is, for example, 1-bit information. For example, the SSB-specific information is set to a value according to the type of power source of the CN device 300 corresponding to the SSB. For example, the SSB-specific information is set to a value of 1 if the CN device 300 corresponding to the SSB is powered by green energy, and to a value of 0 if the CN device 300 corresponding to the SSB is powered by non-green energy. The SSB-specific information may be information indicating, for each SSB, whether or not a data center related to the communication corresponding to the SSB is in green operation.

[0102] As another example, the SSB-specific information may be set to a value of 1 if the SSB-compatible CN device 300 is operating in low power consumption mode, and may be set to a value of 0 if the SSB-compatible CN device 300 is not operating in low power consumption mode. As another example, the SSB-specific information may be set to a value of 1 if the SSB-compatible CN device 300 can operate in low power consumption mode, and may be set to a value of 0 if the SSB-compatible CN device 300 cannot operate in low power consumption mode.

[0103] As another example, the SSB-specific information may be information indicating whether the green energy usage rate in the SSB-compatible CN device 300 is equal to or greater than a certain level. For example, suppose a standard is established by the government or the like that a green energy usage rate of a predetermined percentage (e.g., 50%) or greater contributes to sustainability. In this case, the SSB-specific information is set to a value of 1 if the renewable energy usage rate in the power sources of the SSB-compatible CN device 300 is equal to or greater than the predetermined percentage, and to 0 if the renewable energy usage rate is less than the predetermined percentage.

[0104] In step S240, the receiving unit 110 receives an SIB from the node 200. The SIB may include cell reselection priority information.

[0105] In step S250, the UE 100 performs cell reselection. Note that, if cell reselection priority information is included in the SIB transmitted from the node 200 to the UE 100, the UE 100 may perform cell reselection based on the cell reselection priority information. The cell reselection priority information is, for example, cell reselection priority information for performing communication based on the normal communication mode. Note that step S250 may be omitted. That is, the UE 100 may use the result of the cell reselection performed in the RRC idle state in step S210 as is.

[0106] In step S260, the UE 100 performs beam selection. Here, when instruction information for performing beam selection based on SSB-specific information is notified to the AS processing unit 133 from the upper layer (upper layer processing unit 150), the control unit 130 performs beam selection based on the SSB-specific information.

[0107] UE100, among the beams (SSB) of the cell selected in cell reselection, selects a beam (SSB) including SSB-specific information as a selection target in beam selection. UE100 measures RSRP for each beam to be selected. UE100 selects a beam with the largest measured RSRP from among the beams to be selected. As another example, UE100 may measure RSRP for each beam and select a beam (SSB) including SSB-specific information from among the beams whose measured RSRP exceeds a threshold.

[0108] In addition, if the RSRP for all beams including SSB-specific information is below the threshold, UE100 cannot select a beam from among the beams to be selected. In this case, UE100 may select a beam with the maximum RSRP from among all beams, including the beam to be selected and beams other than the beam to be selected. Furthermore, beam selection may involve selecting a random access resource corresponding to the SSB. For example, UE100 measures the RSRP for each SSB including SSB-specific information. UE100 selects a random access resource corresponding to the SSB with the maximum measured RSRP from among the SSBs including SSB-specific information.

[0109] The SSB-specific information may be an index for green operation for communication corresponding to SSB. The index for green operation may be, for example, the green energy usage rate in the CN device 300 corresponding to SSB or in the data center. The index for green operation may be something other than the green energy usage rate in the CN device 300 corresponding to SSB or in the data center, similar to the index for green operation described in the second embodiment.

[0110] When the SSB-specific information is an index for green operation for communication corresponding to the SSB, a threshold value or a target value for the index for green operation may be included in the green priority information notified in step S120 from the NAS processing unit 132 to the AS processing unit 133. The threshold value or the target value for the index for green operation to be notified to the AS processing unit 133 may be notified from the application processing unit 131 to the NAS processing unit 132.

[0111] In the beam selection performed in step S260, UE100 compares the value of the indicator for green operation with a threshold or target value for the indicator for green operation, and determines whether the beam is subject to green operation.

[0112] The UE 100 determines that the beam determined to be a target for green operation is the beam with the highest priority in beam selection, and selects the determined beam in beam selection. Here, the UE 100 may exclude beams other than the beam with the highest priority from candidates for beam selection. As another example, the UE 100 may determine that the frequency of the beam determined to be a target for green operation is the frequency with the highest priority in beam selection, and select the beam of the determined frequency in beam selection.

[0113] (4) Fourth Embodiment With reference to Fig. 10 , the fourth embodiment will be described, mainly focusing on differences from the first embodiment. In the fourth embodiment, green operation information regarding green operation for a neighboring cell or a neighboring frequency is broadcast from the node 200 to the UE 100. In the UE 100 according to the fourth embodiment, the receiving unit 110 receives green operation information regarding green operation for a neighboring cell or a neighboring frequency from the node 200. The control unit 130 performs cell reselection based on the green operation information.

[0114] (4.1) Example of System Operation Fig. 10 is a diagram showing an example of system operation according to the fourth embodiment. Note that the processes of steps S310, S320, S330, S360, S370, S380, S390, and S3100 are similar to the processes of steps S10, S20, S30, S60, S70, S80, S90, and S100 in Fig. 7, and therefore descriptions thereof will be omitted.

[0115] In step S340, the receiving unit 110 receives green operation information regarding green operation for a neighboring cell or a neighboring frequency from the node 200. Here, the node 200 transmits the green operation information in an SIB (e.g., SIB3 or SIB4). Thus, the receiving unit 110 receives the SIB including the green operation information from the node 200.

[0116] In this embodiment, the green operation information is information indicating whether or not green operation is in progress for each ID of a neighboring cell. The neighboring cell is a neighboring cell of the cell used to transmit the green operation information. Therefore, in this embodiment, the green operation information is information indicating, for each ID of the neighboring cell, whether or not green operation is in progress for a neighboring cell of the cell corresponding to the node 200 that transmits the green operation information to the UE 100. For example, if the cell corresponding to the node 200b and the cell corresponding to the node 200c are neighboring cells of the cell corresponding to the node 200a, in this embodiment, the green operation information transmitted by the node 200a indicates whether or not green operation is in progress for each of the neighboring cell corresponding to the node 200b and the neighboring cell corresponding to the node 200c.

[0117] The green operation information is, for example, 1-bit information. In the green operation information, a value is set according to the type of power source of the node 200 (e.g., node 200b or node 200c) corresponding to the adjacent cell. For example, the green operation information is set to a value of 1 if the node 200 corresponding to the adjacent cell is powered by green energy, and to a value of 0 if the node 200 corresponding to the adjacent cell is powered by non-green energy. Note that the green operation information may be information indicating, for each adjacent cell, whether or not a data center associated with the adjacent cell is in green operation. Furthermore, the green operation information may be information indicating, for each adjacent frequency, whether or not green operation is in progress. The adjacent frequency is the frequency of the adjacent cell. Therefore, the green operation information is information indicating, for each adjacent cell or adjacent frequency, whether or not green operation is in progress.

[0118] As another example, the green operation information may be set to a value of 1 when the node 200 corresponding to the adjacent cell is operating with low power consumption, and may be set to a value of 0 when the node 200 corresponding to the adjacent cell is not operating with low power consumption. As another example, the green operation information may be set to a value of 1 when the node 200 corresponding to the adjacent cell can operate with low power consumption, and may be set to a value of 0 when the node 200 corresponding to the adjacent cell cannot operate with low power consumption.

[0119] As another example, the green operation information may be information indicating whether the green energy usage rate in the node 200 corresponding to the adjacent cell is equal to or greater than a certain level. For example, suppose that a standard is set by the government or the like that a green energy usage rate of equal to or greater than a certain percentage (e.g., 50%) contributes to sustainability. In this case, the green operation information is set to a value of 1 if the renewable energy usage rate in the power source of the node 200 corresponding to the adjacent cell is equal to or greater than the certain percentage, and to 0 if the renewable energy usage rate is less than the certain percentage.

[0120] In step S350, the UE 100 performs cell reselection. Here, when instruction information for performing cell reselection based on green operation information is notified to the AS processing unit 133 from the upper layer (upper layer processing unit 150), the control unit 130 performs cell reselection based on the green operation information.

[0121] The UE 100 determines that the neighboring cell whose green operation information indicates that it is green operation is the cell with the highest priority in cell reselection, and selects the determined neighboring cell in cell reselection. Here, the UE 100 may exclude cells other than the highest priority cell from candidates for cell reselection. As another example, the UE 100 may determine that the frequency to which the neighboring cell whose green operation information indicates that it is green operation belongs is the frequency with the highest priority in cell reselection, and select the neighboring cell belonging to the determined frequency in cell reselection.

[0122] The green operation information may be an index for green operation for each adjacent cell or adjacent frequency. The index for green operation may be, for example, the green energy usage rate in the node 200 corresponding to the adjacent cell or adjacent frequency. Similar to the index for green operation described in the second embodiment, the index for green operation may be something other than the green energy usage rate in the node 200 corresponding to the adjacent cell or adjacent frequency.

[0123] When the green operation information is an index for green operation, a threshold value or a target value for the index for green operation may be included in the green priority information notified in step S320 from the NAS processing unit 132 to the AS processing unit 133. The threshold value or the target value for the index for green operation to be notified to the AS processing unit 133 may be notified from the application processing unit 131 to the NAS processing unit 132.

[0124] If the green operation information is an indicator for green operation, in the cell reselection performed in step S250, UE100 compares the value of the indicator for green operation with a threshold or target value for the indicator for green operation, and determines whether the neighboring cell is a target for green operation.

[0125] The UE 100 determines that the neighboring cell determined to be a green operation target is the cell with the highest priority in cell reselection, and selects the determined neighboring cell in cell reselection. Here, the UE 100 may exclude cells other than the cell with the highest priority from candidates for cell reselection. As another example, the UE 100 may determine that the frequency to which the neighboring cell determined to be a green operation target belongs is the frequency with the highest priority in cell reselection, and select the neighboring cell belonging to the determined frequency in cell reselection.

[0126] A program may be provided that causes a computer (UE 100, node 200) to execute the operations according to the above-described embodiments. The program may be recorded on a computer-readable medium. Using the computer-readable medium, the program can be installed on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM. Furthermore, circuits that execute the processes performed by the UE 100 or the node 200 may be integrated, and at least a part of the UE 100 or the node 200 may be configured as a semiconductor integrated circuit (chipset, system-on-chip (SoC)).

[0127] In the above embodiment, an example in which the node 200 is an NR base station (gNB) has been described, but the node 200 may be an LTE base station (eNB) or a 6G base station. The node 200 may also be a relay node such as an IAB (Integrated Access and Backhaul) node. The node 200 may also be a DU of the IAB node. The UE 100 may also be a Mobile Termination (MT) of the IAB node.

[0128] Furthermore, the term "node" primarily refers to a base station, but may also refer to a core network device or a part of a base station (CU, DU, or RU (Radio Unit)). Furthermore, a node may be configured by a combination of at least a part of a core network device and at least a part of a base station.

[0129] One embodiment of the present invention has been described in detail above with reference to the drawings, but the specific configuration is not limited to that described above, and various design changes and the like are possible within the scope that does not deviate from the gist of the present invention.

[0130] 1 Network 10 RAN 20 CN 100 UE 110 Receiving unit 120 Transmitting unit 130 Control unit 140 Wireless communication unit 200 Node 210 Transmitting unit 220 Receiving unit 230 Control unit 240 NW communication unit 250 Wireless communication unit 300 CN device

Claims

1. A user device that performs wireless communication with a node in a mobile communication system, comprising: a receiving unit that receives synchronization signal block specific information from the node; and a control unit that performs beam selection based on the synchronization signal block specific information, wherein the synchronization signal block specific information is information regarding green operation of communication corresponding to the synchronization signal block (SSB) used to transmit the synchronization signal block specific information.

2. The user device according to claim 1, wherein the synchronization signal block specific information is information indicating whether or not the communication corresponding to the SSB is in green operation.

3. The user device according to claim 1, wherein the synchronization signal block specific information is an indicator of green operation for communication corresponding to the SSB.

4. The user equipment according to claim 1, wherein the receiving unit receives the SSB including a master information block (MIB) including the synchronization signal block specific information from the node.

5. The user device of claim 1, wherein the control unit performs beam selection based on the synchronization signal block unique information when instruction information for performing beam selection based on the synchronization signal block unique information is notified from a higher level to a first processing unit that processes the first layer.

6. A communication method used by a user device that performs wireless communication with a node in a mobile communication system, comprising: a receiving step of receiving synchronization signal block specific information from the node; and a control step of performing beam selection based on the synchronization signal block specific information, wherein the synchronization signal block specific information is information regarding green operation of communication corresponding to the synchronization signal block (SSB) used to transmit the synchronization signal block specific information.

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