Communication device, base station, and communication method

Abstract

In a communication device (100) according to an embodiment, configuration information that is used for acquiring an on-demand SIB1 includes one or multiple physical cell identifiers, information indicating time and frequency resources of a PRACH corresponding to the one or multiple physical cell identifiers, and information for indicating a monitoring opportunity for the on-demand SIB1 corresponding to the one or multiple physical cell identifiers. A communication device according to an embodiment uses resources of a PRACH indicated on the basis of information indicating the time and frequency resources of the PRACH to transmit a request for an on-demand SIB1 to a second cell identified by any among the one or multiple physical cell identifiers, and monitors a PDCCH for the on-demand SIB1 in the second cell only during a monitoring opportunity corresponding to one SSB from among a plurality of SSBs, said monitoring opportunity being indicated on the basis of information for indicating a monitoring opportunity for the on-demand SIB1.

Description

Communication Device, Base Station, and Communication Method Cross - Reference to Related Applications

[0001] This application is based on Patent Application No. 2025 - 017098 filed on February 4, 2025, claims the benefit of its priority, and all the contents of that patent application are incorporated herein by reference.

[0002] This disclosure relates to a communication device, a base station, and a communication method.

[0003] In the 3GPP (Registered Trademark. The same shall apply hereinafter) (Third Generation Partnership Project), which is a standardization project for mobile communication systems, network energy saving (NES) is being discussed. As one of the NESs, the introduction of System Information Block Type 1 (hereinafter, appropriately referred to as on - demand SIB1) transmitted in response to a request from a communication device is being considered (for example, see Non - Patent Document 1). A cell that supports on - demand SIB1 (hereinafter, appropriately referred to as an NES cell) does not need to transmit SIB1 periodically, so energy can be saved.

[0004] Discussion is being held on the switching of an NES cell between a state where SIB1 is always transmitted (hereinafter, a normal cell) and a state where SIB1 is transmitted in response to a request (hereinafter, an on - demand SIB1 cell). Also, when the NES cell is an on - demand SIB1 cell, it is assumed that the NES cell switches between a state where SIB1 (on - demand SIB1) is transmitted in response to a request from a communication device and a state where SIB1 is not transmitted.

[0005] When the NES cell is transmitting SIB1 (or on - demand SIB1), the communication device can omit the transmission of the uplink wake - up signal for requesting the transmission of SIB1 and receive SIB1, thereby achieving power saving.

[0006] "R1 - 2410484" (On - demand SIB1 procedure)

[0007] The communication device according to the first embodiment includes a receiving unit that receives system information from a first cell, including configuration information used to acquire an on-demand system information block type 1 (SIB1), and a control unit. The configuration information includes one or more physical cell identifiers, information indicating the time and frequency resources of a physical random access channel (PRACH) corresponding to the one or more physical cell identifiers, and information indicating monitoring opportunities for the on-demand SIB1 corresponding to the one or more physical cell identifiers. The receiving unit receives a plurality of synchronization signals and physical broadcast channel blocks (SSBs) from a second cell. The control unit uses the PRACH resources indicated based on the information indicating the time and frequency resources of the PRACH to transmit a request for the on-demand SIB1 to the second cell identified by one of the one or more physical cell identifiers, and monitors the PDCCH for the on-demand SIB1 in the second cell only at monitoring opportunities indicated based on the information indicating monitoring opportunities for the on-demand SIB1, and only at monitoring opportunities corresponding to one of the plurality of SSBs.

[0008] A base station according to the second embodiment includes a transmitting unit that transmits a plurality of synchronization signals and physical broadcast channel blocks (SSBs) in a first cell; a receiving unit that receives requests for on-demand system information block type 1 (SIB1) in the first cell using the resources of a physical random access channel (PRACH); and a control unit that controls the transmission of downlink control information on the PDCCH for on-demand SIB1 in the first cell only when there is a monitoring opportunity corresponding to one of the plurality of SSBs. The first cell is identified by one or more physical cell identifiers included in the configuration information included in the system information from the second cell, which is used to acquire the on-demand SIB1. The resources of the PRACH are indicated based on information indicating the time and frequency resources of the PRACH corresponding to the one or more physical cell identifiers. The downlink control information is transmitted based on information indicating a monitoring opportunity for the PDCCH for on-demand SIB1 corresponding to the one or more physical cell identifiers.

[0009] The third aspect of the communication method is a communication method performed by a communication device. The communication method receives system information from a first cell, which includes configuration information used to acquire an on-demand system information block type 1 (SIB1), the configuration information including one or more physical cell identifiers, information indicating the time and frequency resources of a physical random access channel (PRACH) corresponding to the one or more physical cell identifiers, and information indicating a monitoring opportunity for the on-demand SIB1 corresponding to the one or more physical cell identifiers; receives a plurality of synchronization signals and physical broadcast channel blocks (SSBs) from a second cell; transmits a request for the on-demand SIB1 to the second cell identified by one of the one or more physical cell identifiers, using the PRACH resources indicated based on the information indicating the time and frequency resources of the PRACH; and monitors the PDCCH for the on-demand SIB1 in the second cell only at the monitoring opportunity indicated based on the information indicating a monitoring opportunity for the on-demand SIB1, and only at the monitoring opportunity corresponding to one of the plurality of SSBs.

[0010] The purpose, features, and advantages of this disclosure will become clearer with reference to the attached drawings and the detailed description below. Figure 1 is a diagram showing the configuration of a mobile communication system according to an embodiment. Figure 2 is a diagram showing an example of the configuration of a protocol stack according to an embodiment. Figure 3 is a diagram showing the configuration of a UE according to an embodiment. Figure 4 is a diagram showing the configuration of a base station according to an embodiment. Figure 5 is a diagram illustrating the first to third operation examples according to an embodiment. Figure 6 is a diagram illustrating the first operation example according to an embodiment. Figure 7 is a diagram illustrating the second operation example according to an embodiment. Figure 8 is a diagram illustrating the third operation example according to an embodiment.

[0011] A mobile communication system according to an embodiment will be described with reference to the drawings. In the drawings, identical or similar parts are denoted by the same or similar reference numerals.

[0012] In existing mobile communication systems, there is no specification for the operation of communication equipment when an NES cell switches the transmission state of SIB1, raising concerns that communication equipment may not be able to properly acquire SIB1. One of the objectives of this disclosure is to provide communication equipment, a base station, and a communication method that enable communication equipment to properly acquire on-demand SIB1.

[0013] (System Configuration) First, the configuration of the mobile communication system 1 according to this embodiment will be described with reference to Figure 1. The mobile communication system 1 is, for example, a system that conforms to the 3GPP Technical Specifications (TS). In the following, the mobile communication system 1 will be described using as an example a 5th Generation System (5G system) of the 3GPP standard, that is, a mobile communication system based on NR (New Radio) radio access.

[0014] The mobile communication system 1 includes a network 10 and a user equipment (UE) 100 that communicates with the network 10. The network 10 includes an NG-RAN (Next Generation Radio Access Network) 20, which is a 5G radio access network, and a 5GC (5G Core Network) 30, which is a 5G core network.

[0015] UE100 is a communication device that communicates via base station 200. UE100 may be a device used by a user. UE100 may be a mobile device such as a smartphone, tablet, notebook PC, communication module, or communication card. UE100 may be a vehicle (e.g., car, train, etc.) or a device installed therein. UE100 may be a transport vehicle other than a vehicle (e.g., ship, airplane, etc.) or a device installed therein. UE100 may be a sensor or a device installed thereon. Note that UE100 may also be called by other names such as terminal, terminal device, mobile station, mobile terminal, mobile device, mobile unit, subscriber station, subscriber terminal, subscriber device, subscriber unit, wireless station, wireless terminal, wireless device, wireless unit, remote station, remote terminal, remote device, or remote unit. Furthermore, UE100 is just one example of a terminal, and terminals may include factory equipment, etc.

[0016] NG-RAN20 includes a plurality of base stations 200. Each base station 200 manages at least one cell. One or more base stations 200 may correspond to one or more cells. A base station 200 may be replaced by a cell, and a cell may be replaced by a base station 200. A cell constitutes the smallest unit of a communication area. One cell belongs to one frequency (carrier frequency). The term "cell" may represent a radio communication resource, or it may represent a communication target of UE100. Each base station 200 can perform radio communication with UE100 located within its own cell. Base stations 200 communicate with UE100 using the RAN protocol stack. Details of the protocol stack will be described later. Base stations 200 are also connected to other base stations 200 (which may be called adjacent base stations) via the Xn interface. Base stations 200 communicate with adjacent base stations via the Xn interface. Furthermore, the base station 200 provides NR user plane and control plane protocol termination for UE100 and is connected to 5GC30 via the NG interface. Such an NR base station 200 is sometimes referred to as gNodeB (gNB).

[0017] 5GC30 includes a core network device 300. The core network device 300 includes, for example, an AMF (Access and Mobility Management Function) and / or a UPF (User Plane Function). The AMF performs mobility management for the UE100. The UPF provides functions specifically for U-plane processing. The AMF and UPF are connected to the base station 200 via an NG interface.

[0018] (Example of protocol stack configuration) Next, an example of the protocol stack configuration according to this embodiment will be described with reference to Figure 2.

[0019] The protocol for the radio section between UE100 and base station 200 comprises a physical (PHY) layer, a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, a PDCP (Packet Data Convergence Protocol) layer, and an RRC (Radio Resource Control) layer.

[0020] The PHY layer performs encoding and decoding, modulation and demodulation, antenna mapping and demapping, and resource mapping and demapping. Data and control information are transmitted between the PHY layer of UE100 and the PHY layer of base station 200 via a physical channel.

[0021] The MAC layer performs data priority control, retransmission processing using Hybrid ARQ (HARQ), and random access procedures. Data and control information are transmitted between the MAC layer of UE100 and the MAC layer of base station 200 via the transport channel. The MAC layer of base station 200 includes a scheduler. The scheduler determines the transport format for the uplink and downlink (transport block size, modulation and coding scheme (MCS)) and the resources to be allocated to UE100.

[0022] The RLC layer transmits data to the receiving RLC layer using the functions of the MAC layer and PHY layer. Data and control information are transmitted between the RLC layer of UE100 and the RLC layer of base station 200 via a logical channel.

[0023] The PDCP layer performs header compression / decompression, encryption / decryption.

[0024] A Service Data Adaptation Protocol (SDAP) layer may be provided as a layer above the PDCP layer. The SDAP layer maps IP flows, which are the units in which the core network performs Quality of Service (QoS) control, to wireless bearers, which are the units in which the Access Stratum (AS) performs QoS control.

[0025] The RRC layer controls the logical channel, transport channel, and physical channel in response to the establishment, re-establishment, and release of the radio bearer. RRC signaling for various settings is transmitted between the RRC layer of UE100 and the RRC layer of base station 200. If there is an RRC connection between the RRC layer of UE100 and the RRC layer of base station 200, UE100 is in the RRC connected state. If there is no RRC connection between the RRC layer of UE100 and the RRC layer of base station 200, UE100 is in the RRC idle state. If the RRC connection between the RRC layer of UE100 and the RRC layer of base station 200 is suspended, UE100 is in the RRC inactive state.

[0026] In UE100, the NAS layer, located above the RRC layer, performs session management and mobility management for UE100. NAS signaling is transmitted between the NAS layer of UE100 and the NAS layer of the core network device 300.

[0027] Furthermore, the UE100 has an application layer and other components in addition to the wireless interface protocol.

[0028] (Wireless Frame Configuration) In a 5G system, downlink and uplink transmissions are composed within wireless frames with a duration of 10ms. For example, a wireless frame is represented by a System Frame Number (SFN) from 0 to 1023. For example, a wireless frame consists of 10 subframes. For example, one subframe may be 1ms long. Also, one subframe may consist of one or more slots. For example, the number of symbols that make up one slot is usually 14 for a Cyclic Prefix (CP) and 12 for an extended CP. Also, the number of slots that make up one subframe changes according to the set subcarrier interval. For example, for a normal CP, if the subcarrier interval is set to 15 kHz, the number of slots per subframe is 1 (i.e., 14 symbols); if the subcarrier interval is set to 30 kHz, the number of slots per subframe is 2 (i.e., 28 symbols); if the subcarrier interval is set to 60 kHz, the number of slots per subframe is 4 (i.e., 56 symbols); and if the subcarrier interval is set to 120 kHz, the number of slots per subframe is 8 (i.e., 112 symbols). Also, for an extended CP, if the subcarrier interval is set to 60 kHz, the number of slots per subframe is 4 (i.e., 48 symbols). In other words, the number of slots constituting one subframe is determined based on the subcarrier interval set by the base station 200. Also, the number of symbols constituting one subframe is determined based on the subcarrier interval set by the base station 200. In other words, the number of symbols constituting a 1 ms subframe is determined based on the subcarrier interval set by the base station 200, and the length (length in the time direction) of each symbol changes.

[0029] (Configuration of User Device) Referring to Figure 3, the configuration of the UE100 according to this embodiment will be described. The UE100 includes a communication unit 110 and a control unit 120.

[0030] The communication unit 110 performs wireless communication with the base station 200 by transmitting and receiving radio signals to and from the base station 200. The communication unit 110 has at least one transmitting unit 111 and at least one receiving unit 112. The transmitting unit 111 and the receiving unit 112 may be configured to include a plurality of antennas and an RF (Radio Frequency) circuit. The antenna converts a signal into radio waves and radiates the radio waves into space. The antenna also receives radio waves in space and converts the radio waves into signals. The RF circuit performs analog processing of the signals transmitted and received via the antenna. The RF circuit may include a high-frequency filter, an amplifier, a modulator, and a low-pass filter, etc.

[0031] The control unit 120 performs various controls on the UE 100. The control unit 120 controls communication with the base station 200 via the communication unit 110. The operations of the UE 100 described above and below may be operations controlled by the control unit 120. The control unit 120 may include at least one processor capable of executing a program and a memory for storing the program. The processor may execute the program to perform the operations of the control unit 120. The control unit 120 may include a digital signal processor that performs digital processing of signals transmitted and received via the antenna and RF circuit. This digital processing includes processing of the RAN protocol stack. The memory stores the program executed by the processor, parameters related to the program, and data related to the program. Memory may include at least one of ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access Memory), and flash memory. All or part of the memory may be contained within the processor.

[0032] (Base station configuration) Referring to Figure 4, the configuration of the base station 200 according to this embodiment will be described. The base station 200 has a communication unit 210, a network communication unit 220, and a control unit 230.

[0033] The communication unit 210, for example, receives a radio signal from the UE 100 and transmits a radio signal to the UE 100. The communication unit 210 has at least one transmitting unit 211 and at least one receiving unit 212. The transmitting unit 211 and the receiving unit 212 may include an RF circuit. The RF circuit performs analog processing of the signals transmitted and received via the antenna. The RF circuit may include a high-frequency filter, an amplifier, a modulator, a low-pass filter, etc.

[0034] The network communication unit 220 transmits and receives signals to and from the network. For example, the network communication unit 220 receives signals from an adjacent base station connected via the Xn interface, which is an inter-base station interface, and transmits signals to the adjacent base station. The network communication unit 220 also receives signals from a core network device 300 connected via the NG interface, and transmits signals to the core network device 300.

[0035] The control unit 230 performs various controls on the base station 200. For example, the control unit 230 controls communication with the UE 100 via the communication unit 210. The control unit 230 also controls communication with nodes (e.g., adjacent base stations, core network devices 300) via the network communication unit 220. The operations of the base station 200 described above and below may be operations controlled by the control unit 230. The control unit 230 may include at least one processor capable of executing programs and a memory for storing programs. The processor may execute programs to perform the operations of the control unit 230. The control unit 230 may include a digital signal processor that performs digital processing of signals transmitted and received via the antenna and RF circuit. This digital processing includes processing of the RAN protocol stack. The memory stores programs executed by the processor, parameters related to the programs, and data related to the programs. All or part of the memory may be contained within the processor.

[0036] (First Operation Example) The first operation example according to this embodiment will be described with reference to Figures 5 and 6. Previously described explanations may be omitted.

[0037] As shown in Figure 5, UE100 (specifically UE101 and UE102) is located within the coverage of cell C1 managed by base station 201 and is capable of receiving radio signals from cell C1. Initially in Figure 6, UE100 may be in an RRC idle state or an RRC inactive state with respect to cell C1. Alternatively, UE100 may be in an RRC connected state with respect to cell C1. That is, in cell C1, the RRC state of UE100 may be RRC idle, RRC inactive, or RRC connected. Cell C1 may be the cell where UE100 is camping. Cell C1 may also be the cell that UE100 has (re)selected. Cell C1 may also be the cell with which UE100 has established an RRC connection. Cell C1 may be referred to as a serving cell.

[0038] Furthermore, as shown in Figure 5, UE100 may be located within the coverage of cell C2 managed by base station 202 and capable of receiving radio signals from cell C2. UE100 may be in a state prior to (re)selecting cell C2, for example. Therefore, cell C2 may not be a cell where UE100 is camped. Alternatively, UE100 may be in an RRC idle state or an RRC inactive state in cell C2. Alternatively, UE100 may be in an RRC connected state in cell C2. Cell C2 may be a cell where UE100 is camped. Also, cell C2 may be a cell that UE100 has (re)selected. Cell C2 may be referred to as a serving cell.

[0039] In this embodiment, we have described a case where base station 201 manages cell C1 and base station 202 manages cell C2, but a single base station 200 may manage both cell C1 and cell C2.

[0040] Cell C1 may be the first cell. The first cell may be at least one of the following: (a1) a cell that always broadcasts SIB1 periodically, (a2) a cell that transmits (starts) SIB1 without a request from UE100, (a3) ​​a cell that does not support on-demand SIB1 (i.e., the on-demand SIB1 function), (a4) a cell that does not transmit on-demand SIB1, (a5) a cell that transmits configuration information for obtaining (and / or requesting) on-demand SIB1, (a6) a cell that does not switch the transmission state of SIB1, or (a7) a cell that does not support switching the transmission state of SIB1. The first cell may also be a serving cell for UE100, or a primary cell (i.e., a P cell) for UE100. The first cell may also be cell A. The first cell may also be referred to as an anchor cell. The SIB1 transmitted (i.e., broadcast) from the first cell may also be referred to as the first SIB1. For example, an SIB1 transmitted to a certain UE 100 without a request from that UE 100 may also be referred to as a first SIB1. Similarly, an SIB1 transmitted to a certain UE 100 in response to a request from a UE different from that UE 100 may also be referred to as a first SIB1. In this embodiment, any description of an SIB1 transmitted to a certain UE 100 without a request from that UE 100 may be replaced with a description of a first SIB1 as appropriate.

[0041] Cell C2 may be a second cell. The second cell may be at least one of the following: (b1) a cell that temporarily broadcasts SIB1, (b2) a cell that transmits SIB1 in response to a request from UE100, (b3) a cell that supports on-demand SIB1 (i.e., the functionality of on-demand SIB1), (b4) a cell that transmits on-demand SIB1, (b5) a cell that supports the transmission of SIB1 based on a request from UE100, (b6) a cell associated with configuration information for obtaining (and / or requesting) on-demand SIB1, (b7) a cell that switches the transmission state of SIB1, and (b8) a cell that supports switching the transmission state of SIB1. Note that the cell associated with configuration information for obtaining (and / or requesting) on-demand SIB1 may be the cell to which said configuration information is applied. The second cell may be called an NES cell. The second cell may also be called a non-anchor cell. Furthermore, the SIB1 transmitted from the second cell (i.e., broadcast) may also be referred to as the second SIB1 (i.e., on-demand SIB1). For example, for a certain UE 100, the SIB1 transmitted in response to a request from that UE 100 may also be referred to as the second SIB1. In this embodiment, any description of the SIB1 transmitted in response to a request from a certain UE 100 may be replaced with a description of the second SIB1 as appropriate.

[0042] In this specification, communication with a cell for UE100 may be communication with a base station, and communication with a base station for UE100 may be communication with a cell. For example, a base station may transmit information / messages, etc., to UE100 from (or within) a cell. For UE100, receiving information / messages, etc., from a cell may be receiving information / messages, etc., from a base station. Similarly, a base station may receive information / messages, etc., from UE100 via (or within) a cell. For UE100, transmitting information / messages, etc., to a cell may be transmitting information / messages, etc., to a base station.

[0043] At the initial stage of FIG. 6, the base station 202 is not transmitting SIB1 in cell C2. Cell C2 may be an on-demand SIB1 cell that transmits SIB1 upon request. The control unit 230 of the base station 202 may switch cell C2 from a normal cell to an on-demand SIB1 cell. At the initial stage of this operation example, the transmission state of SIB1 in cell C2 (hereinafter, the SIB1 transmission state) is a state in which SIB1 is not transmitted from cell C2 (therefore, "not Broadcasting").

[0044] Step S111: As shown in FIG. 6, the transmission unit 211 of the base station 201 may transmit setting information (hereinafter, UL WUS setting information (UL WUS config.)) Regarding the setting of an uplink wake-up signal (UpLink WakeUp Signal: UL WUS) for requesting the transmission of SIB1 from cell C1 to UE101. The receiving unit 112 of UE101 may receive the UL WUS setting information from cell C1.

[0045] The UL WUS setting information may be included in a radio resource control (RRC) message. As shown in FIG. 5, the UL WUS setting information may be included, for example, in a system information block related to the SIB of another cell. That is, the UL WUS setting information may be included in a system information message (SI message, hereinafter also referred to as SIBX). UE101 may request the broadcast of SIBX from cell C1. The transmission unit 211 of the base station 201 may transmit SIBX including the UL WUS setting information to UE101 in response to the request from UE101.

[0046] Also, when UE101 is in the RRC connected state, the transmission unit 211 of the base station 201 may transmit an individual RRC message including the UL WUS setting information from cell C1 to UE101. The receiving unit 112 of UE101 may receive the individual RRC message from cell C1. The individual RRC message may be an RRC message sent individually to each UE101.

[0047] Note that although the base station 201 transmits ULWUS setting information regarding the setting of the uplink wake-up signal to cell C2 in cell C1, this is not the only case. For example, the base station 202 may transmit ULWUS setting information in cell C2. The UE 101 may receive ULWUS setting information from cell C2, for example, after (re)selecting cell C2 until it (re)selects another cell.

[0048] The UL WUS setting information may include, for example, information regarding the setting of the uplink wake-up signal. The UL WUS setting information may be information regarding the setting for requesting (on-demand) SIB1 from the second cell. The UL WUS setting information may be a setting (i.e., information) used for transmitting information indicating that the broadcast of SIB1 is requested.

[0049] The UL WUS setting information may include, for example, information (e.g., an identifier (NES-CellId) indicating the second cell) for identifying to which cell the setting information is to be applied. The information may include at least one of, for example, an identifier indicating a cell (e.g., a physical cell identifier (PCI: Physical Cell Identifier)) and information indicating a frequency (e.g., an absolute radio frequency channel number (ARFCN: Absolute Radio-Frequency Channel Number)). The control unit 120 of the UE 101 may identify the second cell based on the identifier indicating the cell included in the UL WUS setting information. Also, the UE 101 may identify the second cell based on the information indicating the frequency included in the UL WUS setting information.

[0050] The UL WUS configuration information may include information for transmitting the uplink wake-up signal. The UL WUS configuration information may include, for example, a setting for requesting SIB1 (e.g., SIB1-RequestConfig.). UL WUS configuration information includes, for example, information indicating the average EPRE (Energy Per Resource Element) (in dBM) of resource elements that the network uses to transmit synchronization signals and second synchronization signals used for transmitting physical broadcast channel blocks (SSB: Synchronization Signal / PBCH block) (e.g., ss-PBCH-BlockPower), information indicating the time domain position of SS blocks transmitted within an SS burst (e.g., SSB-positionInBurst), and information indicating the frequency of SS blocks (e.g., ARFCN: Absolute Radio Frequency Channel Number). It may include at least one of the following: (absolute radio frequency channel number, also called information for indicating the frequency position of the SS block), information indicating the periodicity of the SS block (ssb-PeriodicityServingCell), cell-specific TDD (Time Division Duplex) information indicating UL / DL settings (e.g., tdd-UL-DL-ConfigurationCommon), information indicating the setting of individual RACH (Random Access Channel) opportunities for SIB1 requests (e.g., rach-OccasionsSIB1), information indicating the period of the SIB1 request setting in the number of association periods (e.g., si-RequestPeriod), and information indicating resources for SIB1 requests (e.g., sib1-RequestResources).Information indicating the configuration of individual RACH opportunities for SIB1 requests may include, for example, "Prach-ConfigurationIndex", "msg1-FDM", "msg1-FrequencyStart", "zeroCorrelationZoneConfiguration", "preambleReceivedTargetPower", "preambleTransMax", "powerRampingStep", "ra-ResponseWindow", "ssb-perRACH-Occasion", etc. Information indicating resources for SIB1 requests may include, for example, "ra-PreambleStartIndex", "ra-AssociationPeriodIndex", and "ra-ssb-OccasionMaskIndex". Furthermore, UL WUS configuration information may include information indicating the subcarrier spacing for the uplink (for example, for transmitting the uplink wake-up signal) (e.g., ULSubCarrierSpacing).

[0051] For example, an SSB (also called an SS block) may consist of 4 OFDM symbols in the time domain and 240 consecutive subcarriers in the frequency domain. The SSB may consist of a primary synchronization signal (hereinafter referred to as PSS) and a secondary synchronization signal (hereinafter referred to as SSS), and a physical broadcast channel (PBCH). Each of the PSS and SSS may occupy 1 OFDM symbol and 127 subcarriers. The PBCH may consist of 3 OFDM symbols and 240 subcarriers. The SSB may include a cell-defining SSB associated with the transmission of SIB1. The SSB may also include a non-cell-defining SSB. The SSB may be transmitted in a cell and / or downlink BWP. For example, the SSB may be transmitted in the initial downlink BWP in a cell. For example, the initial downlink BWP may be identified as a downlink BWP with an identifier value of "0". Furthermore, SSB may be transmitted on downlink BWPs other than the initial downlink BWP in the cell. For example, downlink BWPs other than the initial downlink BWP may be identified as downlink BWPs with an identifier value other than "0".

[0052] SSB may be transmitted based on information indicating the frequency of the SS block, the periodicity of the SSB, and / or the subcarrier spacing (SCS) of the SSB. For example, SSB may be transmitted based on the periodicity of the SSB set for a cell (e.g., an on-demand SIB1 cell, one or more second cells), and / or the subcarrier spacing set for a cell (e.g., an on-demand SIB1 cell, one or more second cells). Alternatively, SSB may be transmitted based on the periodicity of the SSB set for a downlink BWP (e.g., a downlink BWP of an on-demand SIB1 cell, a downlink BWP of one or more second cells), and / or the subcarrier spacing set for a downlink BWP (e.g., a downlink BWP of an on-demand SIB1 cell, a downlink BWP of one or more second cells). The receiving unit 112 of UE 101 may anticipate (specify) opportunities for SSB reception. For example, the receiving unit 112 of UE 101 may anticipate opportunities for SSB reception based on the periodicity of SSB and / or the subcarrier interval of SSB. The receiving unit 112 of UE 101 may receive SSB during the period of SSB reception according to information indicating the time domain position of SS blocks transmitted within an SS burst (e.g., SSB-positionInBurst). That is, the information indicating the time domain position of SS blocks transmitted within an SS burst (e.g., SSB-positionInBurst) may be information indicating the time domain position in which SS blocks are actually transmitted within an SS burst. An SS burst may be a half-frame (i.e., half of one radio frame, 5 ms). Here, the information indicating the frequency of the SS block, the information indicating the time domain position of the SS block transmitted within the SS burst, the periodicity of the SSB, and / or the subcarrier spacing of the SSB are also referred to as the information used to receive (or transmit) the SSB.

[0053] The UL WUS configuration information may include information for setting a period (hereinafter appropriately referred to as the check period) for checking whether or not SIB1 is being transmitted from the cell. This information may include, for example, at least one of the following: information indicating the start time of the check period, information indicating the end time of the check period, and information indicating the check period. The check period may be indicated by at least one of the system frame number (SFN), slot, or symbol. This information may also indicate a specific window (e.g., SIB monitoring window, SIB1 time window) that indicates the period during which UE101 monitors SIB from cell C2. The check period may also be a period for checking the transmission status of SIB1. That is, the check period may correspond to the period during which SIB1 is being transmitted from the cell. The information for setting the check period may also be information for setting the period during which SIB1 is being transmitted from the cell. For example, UE101 may monitor (or acquire) SIB1 based on the information for setting the period during which SIB1 is being transmitted from the cell. Furthermore, the check period may correspond to the validity period of the transmission status of SIB1 sent from the cell. The information for setting the check period may also be the information for setting the validity period of the transmission status of SIB1 sent from the cell. For example, UE101 may monitor (or acquire) SIB1 based on the information for setting the validity period of the transmission status of SIB1 sent from the cell. That is, UE101 may determine the period during which the current transmission status of SIB1 is valid based on the information for setting the validity period of the transmission status of SIB1 sent from the cell.

[0054] This information may include, for example, information indicating the transmission repetition period of SIB1, or information indicating the length of the check period relative to the transmission repetition period of SIB1 (i.e., a multiple of the transmission repetition period of SIB1). This information may also include, for example, information indicating the number of repetitions relative to the transmission repetition period of SIB1.

[0055] The information may include, for example, information indicating the SSB reception time in cell C2, or information indicating a physical downlink control channel (PDCCH) monitoring opportunity for SIB1 in cell C2. The information indicating a PDCCH monitoring opportunity may include, for example, information for setting a Type 1-PDCCH CSS set. The information indicating the SSB reception time may include the SSB-related information used to receive the SSB, cell-related information, and / or downlink BWP-related information as described above.

[0056] The UL WUS configuration information may include the above-described information for each of one or more second cells. That is, the above-described information may be set for each of one or more second cells. For example, the UL WUS configuration information may include information for setting a check period for each of one or more second cells. This information may include, for example, information for independently setting a check period for each of one or more second cells. Therefore, for example, a second cell identifier may be associated with one or more pieces of information for determining the check period. The one or more pieces of information may be different from each other. UE101 may perform the determination described later based on the check period in the second cell indicated by the second cell identifier associated with the check period determined by the information. Furthermore, this information may include information for setting a common check period for each of one or more second cells. In this case, the UL WUS configuration information does not need to include multiple pieces of information that are different from each other as information for determining the check period. Furthermore, UE101 eliminates the need to determine the check period for each second cell, compared to the case where the check period is set independently. Note that, in order to identify the second cells to which a common check period applies, the information for determining the check period may be associated with identifiers for multiple second cells. Here, some of the above information may be set for each of one or more second cells, and some of the above information may be set in common for one or more second cells. For example, the UL WUS setting information may include information used to determine which of the above information is set for each of one or more second cells. Also, the UL WUS setting information may include information for determining which of the above information is set in common for one or more second cells. Furthermore, the UL WUS setting information may include information for determining whether some of the above information is set for each of one or more second cells, or whether it is set in common for one or more second cells.UE101 may determine, based on the information contained in the UL WUS configuration information, which information is set for each of the one or more second cells and which information is set in common for the one or more second cells.

[0057] The UL WUS configuration information may include information for setting check periods for each SIB1 transmission corresponding to multiple SSB transmissions in the second cell. Note that multiple SSB transmissions may be replaced with multiple SSB beams and / or multiple SSB indices. Multiple SSB transmissions may be determined based on information indicating the time domain position of SS blocks transmitted within an SS burst included in the UL WUS configuration information (e.g., SSB-positionInBurst). This information may include information for independently setting check periods for each SIB1 transmission corresponding to multiple SSB transmissions in the second cell. For example, an SSB index may be associated with one or more pieces of information for determining the check period. In this case, UE101 may receive an SSB transmission corresponding to the SSB index associated with the check period determined by this information, and perform the determination described later based on the check period associated with the received SSB. Furthermore, this information may include information for setting a common check period for each of the SIB1 transmissions corresponding to multiple SSB transmissions in the second cell. In this case, UE101 may perform the determination described below based on the common check period, regardless of which of the SSBs received in the second cell it receives.

[0058] The UL WUS configuration information may include a timer value set in a timer for determining the elapsed time of the check period. The control unit 120 may determine that the check period has expired when the timer to which the timer value has been set has expired. For example, as will be described later, after deciding to re-select cell C2, the control unit 120 may start a timer based on the reception time of the first SSB received in cell C2, or the first PDCCH monitoring opportunity for SIB1. That is, the control unit 120 may start checking whether SIB1 is being transmitted in cell C2 based on the reception of an SSB in cell C2. Alternatively, the control unit 120 may start checking whether SIB1 is being transmitted in cell C2 based on a PDCCH monitoring opportunity for SIB1 in cell C2 (for example, the start (start position) of the PDCCH monitoring opportunity for SIB1, or the end (end position) of the PDCCH monitoring opportunity for SIB1). Here, the control unit 120 may identify cell C2 (i.e., cell) based on information indicating whether or not cell C2 (i.e., cell) is a second cell (e.g., an on-demand SIB1 cell). Based on the reception of information indicating whether or not cell C2 (i.e., cell) is a second cell (e.g., an on-demand SIB1 cell), the control unit 120 may start checking whether or not SIB1 is being transmitted in cell C2.

[0059] It should be noted that, although the above-mentioned information is described as being included in the UL WUS configuration information, it is not limited to this. The above-mentioned information may not be included in the UL WUS configuration information, but may be included in other configuration information, for example. The above-mentioned information, or information indicating the above-mentioned information, may be included in the Master Information Block (MIB) of the SSB physical broadcast channel (PBCH) received from the second cell.

[0060] Step S112: The control unit 120 of UE101 may determine whether or not to send an uplink wake-up signal to cell C2. The control unit 120 may, for example, determine whether or not to send an uplink wake-up signal to cell C2 based on the re-selection of cell C2 (i.e., NES cell) from cell C1 (i.e., cell A). The control unit 120 may perform the following operations based on the re-selection of cell C2.

[0061] Base station 202 may transmit an SSB burst in cell C2. The receiving unit 112 of UE 101 may receive an SSB burst (sometimes called an SS burst) consisting of multiple SSBs from cell C2. That is, base station 202 may transmit an SSB in cell C2 during the SSB burst period (the opportunity to receive an SSB). Also, the receiving unit 112 of UE 101 may receive an SSB in cell C2 during the SSB burst period (the opportunity to receive an SSB).

[0062] The control unit 120 of UE101 may determine the check period. The control unit 120 may determine the check period based on information for setting the check period. For example, the control unit 120 may determine the start time of the check period based on information indicating the start time of the check period. The control unit 120 may determine the end time of the check period based on information indicating the end time of the check period. The control unit 120 may determine the check period based on information indicating the check period.

[0063] The control unit 120 may determine the check period based on information indicating the transmission repetition period of SIB1. The control unit 120 may determine the check period to be the same as the transmission repetition period of SIB1, or it may determine the check period to be a multiple of the transmission repetition period of SIB1. The control unit 120 may determine the check period to be longer than or equal to the repetition period of SIB1. The control unit 120 may determine the check period based on information indicating a multiple of the transmission repetition period of SIB1. The control unit 120 may determine the check period based on information indicating the number of repetitions relative to the transmission repetition period of SIB1. If the control unit 120 has not received information indicating the transmission repetition period of SIB1, or if the transmission repetition period of SIB1 is not set in UE101, it may determine a default period (e.g., 20ms) as the check period. The default period may be set in advance in UE100. The control unit 120 may store the default period in advance.

[0064] The control unit 120 may determine the check period based on information indicating the reception time of the SSB in cell C2. For example, the control unit 120 may set the reception time of the SSB as the start of the check period. Alternatively, the control unit 120 may determine the check period based on information indicating a PDCCH monitoring opportunity for SIB1 in cell C2. The control unit 120 may determine the check period so that it includes a PDCCH monitoring opportunity. After deciding to re-select cell C2, the control unit 120 may set the reception time of the first SSB received in cell C2, or the first PDCCH monitoring opportunity for SIB1, as the start of the check period.

[0065] The control unit 120 may determine the check period based on information for independently setting the check period for each of the one or more second cells. The control unit 120 may also determine the check period in cell C2 based on information for determining the check period associated with an identifier indicating cell C2. Furthermore, when UE 101 determines whether or not to transmit an uplink wake-up signal in another cell, it may determine a check period separately from the check period in cell C2 based on information for determining the check period associated with an identifier indicating the other cell.

[0066] The control unit 120 may determine the check period based on information for setting a common check period for each of the one or more second cells. If the control unit 120 has determined the check period for cell C2, it may use the already determined check period when determining whether or not to transmit an uplink wake-up signal in other cells. Therefore, the control unit 120 may omit determining the check period for each cell.

[0067] The control unit 120 may determine the check period for each SSB transmission in the second cell based on information for independently setting the check period for each SSB transmission of SIB1 corresponding to a plurality of SSB transmissions. Therefore, the control unit 120 may determine the check period for each SIB1 transmission corresponding to each SSB transmission, or it may determine the check period for a specific SIB1 corresponding to a specific SSB transmission among the plurality of SSB transmissions, and omit determining the check period for the other SIB1s. For example, the control unit 120 may determine a first check period for the SIB1 transmission corresponding to the SSB transmission (SSB beam) of the first SSB index (SSB index #1), and a second check period for the SIB1 transmission corresponding to the SSB transmission (SSB beam) of the second SSB index (SSB index #2). Alternatively, the control unit 120 may determine the check period for a specific SIB1 transmission corresponding to the SSB transmission of a specific SSB index among the plurality of SSB indexes. On the other hand, the control unit 120 does not need to determine a check period for SIB1 transmissions other than the specific SIB1 transmission.

[0068] The control unit 120 may determine a common check period for each of the multiple SSB transmissions in the second cell based on information for setting a common check period for each of the multiple SIB1 transmissions. Therefore, the control unit 120 may determine a common check period that applies to any of the multiple SIB1 transmissions corresponding to the multiple SSB transmissions.

[0069] The control unit 120 may control a timer (hereinafter referred to as the first timer) for determining the elapsed time of the check period. The first timer may be a timer for checking the transmission status of SIB1. The control unit 120 may, for example, set a timer value received from cell C1 or cell C2 to the first timer, or set a timer value pre-set in UE100. The control unit 120 may, for example, start the first timer when checking whether SIB1 is being transmitted from cell C2. The control unit 120 may, for example, start the first timer when deciding to re-select cell C2. The control unit 120 may also start the first timer based on the start time of the check period. After deciding to re-select cell C2, the control unit 120 may start the first timer based on the reception time of the first SSB received in cell C2, or the first PDCCH monitoring opportunity for SIB1.

[0070] The control unit 120 may determine the check period based on pre-set information. Therefore, the control unit 120 may store in advance at least one of the pieces of information used to determine the check period as described above. The control unit 120 may also store in advance a timer value for the first timer. The information stored in advance may be specified in the technical specifications.

[0071] During the check period, the control unit 120 may attempt to receive SIB1 from cell C2. If the control unit 120 receives an SSB from cell C2, it may receive a Master Information Block (MIB) on the Physical Broadcast Channel (PBCH) of the received SSB. Based on the information contained in the MIB, the control unit 120 monitors the PDCCH with cyclic redundancy checks (CRC) scrambled by the System Information Radio Network Temporary Identifier (SI-RNTI). The PDCCH carries scheduling information indicating the radio resource allocation of SI messages. The control unit 120 may, for example, determine CORESET #0 and / or Search Space #0 for the PDCCH with CRC scrambled by the SI-RNTI based on the information contained in the MIB. Furthermore, the control unit 120 may determine CORESET #0 and / or search space #0 for the PDCCH with CRC scrambled by SI-RNTI based on information set based on UL WUS configuration information (e.g., Type0-PDCCH CSS set). The control unit 120 may monitor the PDCCH based on the determined CORESET #0 and search space #0. The control unit 120 may start monitoring the PDCCH from the earliest PDCCH monitoring opportunity within the check period. The control unit 120 may determine the first symbol of the earliest CORESET set configured in UE 100 to receive the PDCCH (e.g., the PDCCH for Type0-PDCCH CSS set) as the starting position. If the control unit 120 successfully decodes the PDCCH with the CRC scrambled by SI-RNTI, it may attempt to receive the SI message (SIB1) based on the scheduling information carried by the PDCCH.

[0072] The control unit 120 may attempt to receive SIB1 from the cell indicated by the identifier of the second cell included in the UL WUS configuration information during the check period. The control unit 120 may perform the reception of SIB1 from cells other than the cell indicated by the identifier of the second cell (normal cells) regardless of the check period. The control unit 120 does not need to determine the check period for cells other than the cell indicated by the identifier of the second cell.

[0073] If multiple SSBs (SSB beams) are being transmitted from cell C2, the control unit 120 may attempt to receive the SIB1 corresponding to each of the multiple SSB transmissions. If the check periods are set independently, the control unit 120 may attempt to receive each of the multiple SIB1 during each check period. Therefore, even if the control unit 120 has finished receiving the SIB1 corresponding to a check period (corresponding to an SSB transmission) due to the expiration of a certain check period, if other check periods have not yet expired, it may continue to attempt to receive the SIB1 corresponding to other check periods (corresponding to SSB transmissions). Also, if the check periods are set in common, the control unit 120 may attempt to receive each of the multiple SIB1 during the common check period. In this case, the control unit 120 may finish receiving all SIB1 corresponding to multiple SSBs due to the expiration of the check period.

[0074] Even when multiple SSBs are being transmitted, the control unit 120 may monitor only the PDCCH monitoring opportunities for a specific SIB1 transmission corresponding to a particular SSB transmission among the multiple SSB transmissions. The control unit 120 does not need to monitor PDCCH monitoring opportunities for SIB1 transmissions corresponding to other SSB transmissions among the multiple SSB transmissions. This allows the UE 100 to save power by monitoring only some of the PDCCH monitoring opportunities. The control unit 120 may, for example, receive SIB1 (e.g., SIB1#1) based on scheduling information carried by the PDCCH received at a specific PDCCH monitoring opportunity. Information indicating a specific SSB transmission may be included in the UL WUS setting information or the MIB from cell C2. The control unit 120 may monitor only the PDCCH monitoring opportunities for a specific SIB1 transmission corresponding to information indicating a specific SSB transmission included in the UL WUS setting information or the MIB from cell C2.

[0075] The control unit 120 may monitor PDCCH until the check period expires. If the control unit 120 receives SIB1 from cell C2 before the check period expires, it may terminate monitoring of PDCCH before the check period expires.

[0076] Furthermore, if the first timer is operating, the control unit 120 may terminate monitoring of the PDCCH based on the expiration of the first timer. The control unit 120 may stop the first timer if it receives SIB1. The control unit 120 may determine that the check period has elapsed based on the expiration of the first timer.

[0077] When the control unit 120 receives SIB1, it may perform the following determination. Also, when the check period has elapsed, that is, when the check period has ended, the control unit 120 may perform the following determination.

[0078] The control unit 120 may determine whether or not to transmit an uplink wake-up signal to cell C2. The control unit 120 may make this determination based on a check period. If the control unit 120 receives an SIB from cell C2 during the check period, it may determine not to transmit an uplink wake-up signal to cell C2. On the other hand, if the control unit 120 does not receive an SIB from cell C2 before the check period has elapsed, it may determine to transmit an uplink wake-up signal to cell C2.

[0079] If the control unit 120 determines that it will send an uplink wake-up signal to cell C2, it may perform the control described later for sending the uplink wake-up signal. The control unit 120 may perform the operation in step S113. For example, as an on-demand SIB1 request procedure, the control unit 120 may trigger a UL WUS transmission to a layer lower than the RRC layer in order to perform the operation in step S113. On the other hand, if the control unit 120 determines that it will not send an uplink wake-up signal to cell C2, that is, if it receives SIB1, it may perform the operation for when SIB1 is received (acquired).

[0080] As shown in Figure 6, in this example, we will proceed with the explanation assuming that base station 202 is not transmitting SIB1 in cell C2.

[0081] Step S113: The receiving unit 112 of UE101 may receive an SSB burst consisting of multiple SSBs from cell C2, similar to step S112. The control unit 120 may receive the SSB burst based on the information for transmitting the uplink wake-up signal included in the UL WUS configuration information.

[0082] The control unit 120 may transmit an uplink wake-up signal (UL WUS) to cell C2 based on the information for transmitting the uplink wake-up signal.

[0083] The uplink wake-up signal may be a signal requesting SIB1 (on-demand SIB1), or a message containing information requesting SIB1 (on-demand SIB1). The uplink wake-up signal may be a signal and / or message containing information requesting the transmission of on-demand SIB1. The uplink wake-up signal (and / or information requesting the transmission of on-demand SIB1) may include a random access preamble. That is, the information requesting the transmission of on-demand SIB1 may include a random access preamble (message 1: MSG1) transmitted on a random access opportunity (e.g., a time resource and / or frequency resource of a physical random access channel (PRACH)). The uplink wake-up signal may be referred to as a request for on-demand SIB1, a transmission of a random access preamble on a random access opportunity (transmission of message 1), or a transmission of PRACH. It should be noted that the uplink wake-up signal may be referred to by other names.

[0084] The receiving unit 212 of the base station 202 may receive an uplink wake-up signal from UE 101 in cell C2. Based on the reception of the uplink wake-up signal from UE 101, the control unit 230 of the base station 202 may decide to transmit SIB1 in cell C2. As a result, the transmitting unit 211 of the base station 202 may start transmitting SIB1 in cell C2.

[0085] If the transmitter 211 of base station 202 decides to transmit SIB1, it may transmit an acknowledgment (ACK) for the uplink wake-up signal. If the transmitter 211 of base station 202 receives MSG1 as the uplink wake-up signal, it may transmit a random access response (RAR) to UE 101. The receiver 112 of UE 101 may receive an acknowledgment for the uplink wake-up signal from cell C2. The receiver 112 of UE 101 may also receive a random access response from cell C2 based on UL WUS configuration information.

[0086] The transmitter 211 of base station 202 may transmit SIB1 in cell C2. If multiple SSBs (SSB beams) are being transmitted from cell C2, the transmitter 211 may transmit a specific SIB1 (SIB1#1) corresponding to a specific SSB transmission among the multiple SSB transmissions. The transmitter 211 of base station 202 may transmit a specific SIB1 (SIB1#1) corresponding to an SSB transmission associated with an uplink wake-up signal from UE101. The transmitter 211 does not have to transmit SIB1 on PDCCH monitoring opportunities corresponding to other SSB transmissions among the multiple SSB transmissions. In Figure 6, the transmitter 211 of base station 202 is transmitting SIB1#1 but not SIB1#2.

[0087] The control unit 230 of the base station 202 may switch the SIB1 transmission state in cell C2 when transmitting SIB1. For example, the control unit 230 may perform control to switch from a state in which SIB1 is not being transmitted (hereinafter referred to as "not Broadcasting") to a state in which SIB1 is being transmitted (hereinafter referred to as "Broadcasting"). Alternatively, the control unit 230 may switch the SIB1 transmission state from the non-broadcast state to the broadcast state while cell C2 remains the second cell. Or, the control unit 230 may switch from the second cell (on-demand SIB1 cell) to the first cell (normal cell). Therefore, the broadcast state may be a state in which cell C2 is transmitting SIB1 in response to a request and / or a state in which cell C2 is the first cell. On the other hand, the non-broadcast state may be a state in which cell C2 is the second cell and is not transmitting SIB1 without a request from UE100.

[0088] The control unit 120 of UE101 may attempt to receive SIB1 from cell C2, similar to step S112. The control unit 120 may attempt to receive SIB1 from cell C2 based on MIB and / or UL WUS setting information. UE100 may, for example, attempt to receive SIB1 from cell C2 within the SIB1 time window. In this example, the receiving unit 112 of UE101 receives SIB1 from cell C2. When UE101 receives SIB1, it may perform the operation performed when SIB1 is received (acquired).

[0089] Next, we will explain the operation of UE102. As mentioned above, we explained the case in which UE101 cannot receive SIB1 during the check period, but in this example, we will explain the case in which UE102 can receive SIB1 during the check period.

[0090] Step S121: UE102 may perform the same operation as in step S111. The receiving unit 112 of UE102 may receive UL WUS configuration information from cell C1. The transmitting unit 211 of base station 201 may transmit UL WUS configuration information separately to UE101 and UE102 using individual RRC messages, or it may transmit UL WUS configuration information by broadcast using a specific SIB (SIBX).

[0091] Step S122: UE102 may perform the same operation as in step S112. As shown in Figure 6, the timing at which the check period of UE102 starts is later than the timing at which the check period of UE101 starts. This may be due to the control unit 120 of UE102 re-selecting cell C2 later than UE101. As shown in Figure 6, there is a time overlap between the check period of UE102 and the SIB1 of UE101. Therefore, UE102 can receive SIB1 during the check period.

[0092] The control unit 120 of UE102 may determine whether or not to transmit an uplink wake-up signal in cell C2, similar to step S112. In this example, the control unit 120 determines not to transmit an uplink wake-up signal because it has received SIB1 during the check period. If the control unit 120 has not received SIB1 during the check period, it may determine to transmit an uplink wake-up signal and execute the operation in step S113.

[0093] As described above, the control unit 120 may determine whether or not to send an uplink wake-up signal to cell C2 based on a check period for confirming whether or not SIB1 is being transmitted from cell C2. By making a determination based on the check period, the UE 101 can confirm whether or not SIB1 is being transmitted from cell C2 during the check period and then determine whether or not to send an uplink wake-up signal. Having a defined check period allows the uplink wake-up signal to be transmitted appropriately compared to the case where the UE 101 decides whether or not to send an uplink wake-up signal at an arbitrary timing. For example, by having the UE 101 attempt to receive SIB1 for only a short time, it becomes possible to avoid sending an uplink wake-up signal even though SIB1 is being transmitted, or checking for a long period of time whether or not SIB1 is being transmitted from cell C2 even though SIB1 is not being transmitted.

[0094] Furthermore, the control unit 120 may determine the check period based on the transmission repetition cycle of SIB1. This allows the UE 101 to determine the check period to include the timing when SIB1 is transmitted.

[0095] Furthermore, the receiving unit 112 may receive information for setting the check period from cell C1, which transmits UL WUS setting information related to the uplink wake-up signal to cell C2. This allows UE 101 to determine the check period even when cell C2 has not transmitted SIB1 and the check period in cell C2 is unknown.

[0096] Furthermore, the receiving unit 112 may receive information in cell C2 for independently setting the period for each of the SIB1 transmissions corresponding to multiple SSB transmissions. This allows for flexible setting of the check period.

[0097] Furthermore, if the control unit 120 receives SIB1 from cell C2 within the check period, it may decide not to send an uplink wake-up signal to cell C2. If the control unit 120 does not receive SIB1 from cell C2 before the check period has elapsed, it may decide to send an uplink wake-up signal to cell C2. As a result, UE 101 will send an uplink wake-up signal only when it cannot actually receive SIB1, thus enabling it to send the uplink wake-up signal appropriately.

[0098] Furthermore, the control unit 120 may control a first timer for determining the elapsed time of the check period. The control unit 120 may determine that the check period has elapsed based on the expiration of the first timer. This allows the UE 101 to determine that the check period has elapsed without directly knowing the length of the check period or the end time of the check period.

[0099] (Second Operation Example) A second operation example according to this embodiment will be described with reference to Figures 5 and 7. Previously described explanations may be omitted. In the first operation example, UE100 determined whether or not to transmit an uplink wake-up signal based on whether or not it received SIB1 during the check period. In this operation example, a case will be described in which UE100 determines whether or not to transmit an uplink wake-up signal based on UL WUS setting information.

[0100] Step S211: The receiving unit 112 of UE101 may receive UL WUS setting information from cell C1, similar to step S111. The UL WUS setting information may include the same information as described above. In this example, the UL WUS setting information may include at least one of the SIB1 transmission status information described later and the period information described later.

[0101] The UL WUS configuration information may include information indicating whether or not SIB1 is being transmitted from cell C2 (hereinafter referred to as SIB1 transmission status information). The SIB1 transmission status information (for example, "sib1-BroadcastStatus") may include information indicating that SIB1 is being transmitted from cell C2 (for example, "Broadcasting"). The SIB1 transmission status information may also include information indicating that SIB1 is not being transmitted from cell C2 (for example, "notBroadcasting"). The SIB1 transmission status information (for example, "sib1-BroadcastStatus") may be set to "Broadcasting" or "notBroadcasting".

[0102] Alternatively, the UL WUS configuration information may include SIB1 transmission status information (i.e., only "Broadcasting") only if SIB1 is being transmitted. In this case, the control unit 120 may determine that SIB1 is being transmitted if the UL WUS configuration information includes SIB1 transmission status information. The control unit 120 may determine that SIB1 is not being transmitted if the UL WUS configuration information does not include SIB1 transmission status information. Alternatively, the UL WUS configuration information may include SIB1 transmission status information (i.e., only "notBroadcasting") only if SIB1 is not being transmitted. In this case, the control unit 120 may determine that SIB1 is not being transmitted if the UL WUS configuration information includes SIB1 transmission status information, and determine that SIB1 is being transmitted if the UL WUS configuration information does not include SIB1 transmission status information.

[0103] The UL WUS configuration information may include information regarding the period for receiving (or monitoring, acquiring) SIB1 from cell C2 (hereinafter referred to as period information). That is, the period information may indicate the period during which SIB1 is transmitted from cell C2. Here, the period for receiving SIB1 transmitted based on a request from UE101 itself (uplink wake-up signal) is called the SIB1 time window. The period for receiving SIB1 transmitted based on a request from another UE is called the SIB1 reception period. The period information may be information used in common regardless of the transmission of the uplink wake-up signal. Therefore, the period information may indicate both the SIB1 time window and the SIB1 reception period. The SIB1 reception period may be based on the SIB1 time window. That is, the end time of the SIB1 reception period may be the same as the end time of the SIB1 time window. The SIB1 reception period may be the same as the SIB1 time window. This reduces the amount of information included in the period information. Alternatively, the period information may include information indicating the SIB1 time window and information indicating the SIB1 reception period. This allows the network to flexibly control the period for receiving SIB1 based on whether or not an uplink wake-up signal is transmitted.

[0104] The period information may consist of information elements similar to those used to set the check period described above. The period information may include, for example, at least one of the following: information indicating the start time of the SIB1 time window and / or SIB1 reception period; information indicating the end time of the SIB1 time window and / or SIB1 reception period; and information indicating the SIB1 time window and / or SIB1 reception period.

[0105] Furthermore, the period information may include at least one of the following: information indicating the transmission repetition period of SIB1; information indicating the reception time of SSB in cell C2; information indicating the PDCCH monitoring opportunity for SIB1 in cell C2; information for setting the SIB1 time window and / or SIB1 reception period for each of the one or more second cells; and information for setting the SIB1 time window and / or SIB1 reception period for the SIB1 transmission corresponding to each of the multiple SSB transmissions in the second cell. The control unit 120 may determine the SIB1 time window and / or SIB1 reception period in the same way as the check period.

[0106] Furthermore, the period information may include a timer value set in a timer for determining the elapsed time of the SIB1 time window (hereinafter referred to as the second timer), or a timer value set in a timer for determining the elapsed time of the SIB1 reception period (hereinafter referred to as the third timer). Note that the second timer and the third timer may be the same timer. In this case, the timer value set in the second timer and the timer value set in the third timer may be the same.

[0107] Step S212: The control unit 120 of UE101 may determine whether or not to send an uplink wake-up signal to cell C2 based on the SIB1 transmission status information. For example, if the SIB1 transmission status information indicates that SIB1 is being transmitted from cell C2, the control unit 120 may determine not to send an uplink wake-up signal. On the other hand, if the SIB1 transmission status information indicates that SIB1 is not being transmitted from cell C2, the control unit 120 may determine to send an uplink wake-up signal. Thus, in this example of operation, the control unit 120 of UE101 determines whether or not to send an uplink wake-up signal to cell C2 regardless of whether or not it actually receives SIB1.

[0108] In this example, as in the first example, the base station 202 does not transmit SIB1 in cell C2. Therefore, we will proceed with the explanation assuming that the control unit 120 of UE 101 has determined to transmit the uplink wake-up signal.

[0109] Step S213: UE101 may perform the same operation as in step S113. The transmitting unit 111 of UE101 may, for example, transmit an uplink wake-up signal to cell C2 based on MIB and / or UL WUS setting information, and attempt to receive SIB1 from cell C2 within the SIB1 time window, similar to step S113. For example, the control unit 120 of UE101 may determine the SIB1 time window based on the period information included in the UL WUS setting information and attempt to receive SIB1 within the determined SIB1 time window.

[0110] The control unit 120 may control the second timer. The control unit 120 may start the second timer based on, for example, the re-selection of cell C2, or based on the transmission of an uplink wake-up signal. The control unit 120 may determine that the period for receiving SIB1 (SIB1 time window) has elapsed based on the expiration of the second timer.

[0111] Since the control unit 120 of UE 101 is transmitting an uplink wake-up signal, it may determine the SIB1 time window based on information indicating the SIB1 time window. If the UL WUS setting information includes information indicating the SIB1 reception period used when another UE transmits an uplink wake-up signal, in addition to the information indicating the SIB1 time window, the control unit 120 does not need to use the information indicating the SIB1 reception period.

[0112] In this example, similar to the first example, the transmitter 211 of the base station 202 starts transmitting SIB1 in cell C2 based on the reception of the uplink wake-up signal from UE101. Therefore, the receiver 112 of UE101 can receive the SIB within the SIB time window. The control unit 120 may terminate monitoring of the PDCCH before the SIB1 time window ends if it receives SIB1 within the SIB1 time window.

[0113] Next, we will explain the operation of UE102. As mentioned above, UE101 transmitted an uplink wake-up signal. Now, we will explain the case where UE102 does not transmit an uplink wake-up signal.

[0114] Step S221: The receiving unit 112 of UE102 may receive UL WUS setting information from cell C1, similar to step S121. In this example, as shown in Figure 7, the receiving unit 112 of UE102 receives UL WUS setting information after UE101 transmits the uplink wake-up signal. The UL WUS setting information may include SIB1 transmission status information.

[0115] Step S222: The control unit 120 of UE102 may, similar to UE101, determine whether or not to transmit an uplink wake-up signal based on the SIB1 transmission status information. In this example, as shown in Figure 7, the SIB1 transmission status in cell C2 has been switched from a non-broadcast state to a broadcast state. Therefore, the SIB1 transmission status information may indicate a broadcast state. For this reason, the control unit 120 of UE102 may determine not to transmit an uplink wake-up signal. If the control unit 120 determines not to transmit an uplink wake-up signal based on the SIB1 transmission status information, it may attempt to receive SIB1 during the SIB1 reception period.

[0116] Furthermore, the control unit 120 of UE102 may determine whether or not to transmit an uplink wake-up signal to cell C2 based on the period information. The control unit 120 may also determine whether or not to transmit an uplink wake-up signal to cell C2 based on the SIB1 reception period indicated by the period information. The control unit 120 may perform the operation of step S223 in order to determine whether or not to transmit an uplink wake-up signal to cell C2.

[0117] Step S223: The control unit 120 may determine the SIB1 reception period based on information indicating the SIB1 reception period. The control unit 120 of UE102 may attempt to receive SIB1 within the SIB1 reception period, similar to step S213.

[0118] The period information may be information used in common regardless of whether or not an uplink wake-up transmission is performed. In this case, the SIB1 reception period is the same as the SIB1 time window. However, if UE102 receives the period information before the start of the SIB1 time window, the start timing of the SIB1 reception period may be the same as the start timing of the SIB1 time window. On the other hand, as shown in Figure 7, if UE102 receives the period information after the start of the SIB1 time window, the start timing of the SIB1 reception period will be later than the start timing of the SIB1 time window. Therefore, the length of the SIB1 reception period for UE102 may be shorter than the length of the SIB1 time window.

[0119] The control unit 120 may control the third timer. The control unit 120 may start the third timer, for example, based on the re-selection of cell C2, or it may start the third timer when the SIB1 transmission status information indicates that SIB1 has not been transmitted. The control unit 120 may determine that the period for receiving SIB1 (SIB1 time window) has elapsed based on the expiration of the third timer.

[0120] The control unit 120 may determine the SIB1 reception period based on MIBs received within the SIB1 reception period or before the start of the SIB1 reception period.

[0121] The control unit 120 may decide not to send an uplink wake-up signal to cell C2 if it receives SIB1 within the SIB1 reception period. The control unit 120 may terminate monitoring of PDCCH before the SIB1 reception period expires if it receives SIB1 within the SIB1 reception period. The control unit 120 may perform the operation performed when SIB1 is received (acquired) if it receives SIB1.

[0122] On the other hand, if the control unit 120 does not receive SIB1 within the SIB1 reception period, it may perform one of the following actions. The control unit 120 may perform one of the following actions depending on the UE implementation.

[0123] Firstly, the control unit 120 may determine to transmit an uplink wake-up signal. Therefore, the control unit 120 may execute control to transmit an uplink wake-up signal. The transmitting unit 111 may transmit an uplink wake-up signal.

[0124] Secondly, if multiple SIB1s are transmitted in cell C2, the control unit 120 may attempt to receive other SIB1s. If the control unit 120 is unable to receive a specific SIB1 corresponding to a particular SSB transmission among the multiple SSB transmissions, it may attempt to receive other SIB1s corresponding to other SSB transmissions among the multiple SSB transmissions. Based on the period information, it may determine the SIB1 reception period corresponding to the other SIB1s and attempt to receive the SIB1s.

[0125] Thirdly, the control unit 120 may consider cell C2 to be banned (bar) (a banned cell). The control unit 120 may re-select another cell. If the other cell is the second cell, the control unit 120 may perform the same operation as described above. For example, if the identifier of the second cell included in the UL WUS configuration information indicates another cell, the control unit 120 may determine whether or not SIB1 has been transmitted from the other cell based on the UL WUS configuration information.

[0126] As described above, UE101 and / or UE102 may receive UL WUS setting information. The control unit 120 may determine whether or not to transmit an uplink wake-up signal to cell C2. The UL WUS setting information may include at least one of the following: information indicating whether or not SIB1 has been transmitted from cell C2, and information regarding the period for receiving SIB1 from cell C2. The control unit 120 may determine whether or not to transmit an uplink wake-up signal to the cell based on at least one of the following: information indicating whether or not SIB1 has been transmitted from cell C2, and information regarding the period for receiving SIB1 from the cell. The control unit 120 can explicitly determine whether or not SIB1 has been transmitted from cell C2 based on the information indicating whether or not SIB1 has been transmitted from cell C2. As a result, UE100 can appropriately transmit an uplink wake-up signal. Furthermore, the control unit 120 can determine whether or not to transmit an uplink wake-up signal after confirming whether or not SIB1 has been transmitted from cell C2 during the period for receiving SIB1 from the cell, based on the information regarding the period for receiving SIB1 from the cell. Having this period defined allows for the transmission of the uplink wake-up signal appropriately compared to the case where UE 101 decides whether or not to transmit an uplink wake-up signal at an arbitrary timing.

[0127] Furthermore, if the information indicating whether or not SIB1 is being transmitted from cell C2 indicates that SIB1 is being transmitted, the control unit 120 may decide not to transmit an uplink wake-up signal to cell C2. If the information indicating whether or not SIB1 is being transmitted from cell C2 indicates that SIB1 is not being transmitted, the control unit 120 may decide to transmit an uplink wake-up signal to cell C2. As a result, the control unit 120 is explicitly shown when it is necessary to transmit an uplink wake-up signal, and is able to transmit the uplink wake-up signal appropriately.

[0128] Furthermore, information regarding the period for receiving SIB1 from cell C2 is common information used regardless of whether or not an uplink wake-up message is transmitted. This allows UE101, which has transmitted an uplink wake-up message, and UE102, which has not, to use the same information, thereby reducing the amount of information included in the period information.

[0129] Furthermore, the information regarding the period for receiving SIB1 from cell C2 may include information for independently setting the period for each SIB1 transmission corresponding to multiple SSB transmissions in cell C2. This allows for flexible setting of the period for receiving SIB1 from cell C2.

[0130] Furthermore, if the control unit 120 receives SIB1 from cell C2 within the period for receiving SIB1 from cell C2, it may decide not to send an uplink wake-up signal to cell C2. If the control unit 120 does not receive SIB1 from cell C2 before the period for receiving SIB1 from cell C2 has elapsed, it may decide to send an uplink wake-up signal to cell C2. As a result, the UE 100 sends an uplink wake-up signal when it is not actually able to receive SIB1, thus enabling it to appropriately send an uplink wake-up signal.

[0131] Furthermore, the control unit 120 may control a second timer and / or a third timer for determining the elapsed period for receiving SIB1 from cell C2. The control unit 120 may determine that the period has elapsed based on the expiration of the timers. This allows the UE 100 to know that the period has elapsed without directly knowing the length of the period and the end time of the period.

[0132] (Third Operation Example) A third operation example according to this embodiment will be described with reference to Figures 5 and 8. Previously described information may be omitted. In this operation example, a case will be described in which UE100 determines whether or not to transmit an uplink wake-up signal based on the MIB from cell C2. That is, UE100 may determine whether or not to transmit an uplink wake-up signal based on information transmitted using the SSB from cell C2.

[0133] Step S311: The receiving unit 112 of UE101 may receive UL WUS setting information from cell C1, similar to step S111. The UL WUS setting information may include the same information as described above. The UL WUS setting information may also include information regarding the period for receiving SIB1. This information may include information indicating the maximum period for receiving SIB1 (maximum period information). The maximum period information may, for example, indicate the maximum period of the SIB1 time window.

[0134] Step S312: UE101 may receive an SSB (SSB burst) from cell C2, similar to step S112, and receive (acquire) an MIB based on the reception of the SSB.

[0135] The MIB may include information indicating whether cell C2 (i.e., cell) is a second cell (e.g., an on-demand SIB1 cell) (hereinafter referred to as second cell information). The MIB may also include SIB transmission status information. The MIB may have fields that include, for example, second cell information and / or SIB transmission status information. The second cell information and / or SIB transmission status information may include, for example, (a) information indicating the frequency domain offset between the SSB and the number of subcarriers in the overall resource block grid (e.g., "ssb-SubcarrierOffset"), i.e., k ＳＳＢThe information corresponding to (b) the Common Control Resource Set (CORESET), the Common Search Space, and / or information for determining the required PDCCH parameters (e.g., "pdcch-ConfigSIB1"), and (c) spares in the MIB ("spare") may be indicated by at least one of the following fields (or information): (b) information for determining the Common Control Resource Set (CORESET), the Common Search Space, and / or the required PDCCH parameters (e.g., "pdcch-ConfigSIB1"), and (c) spares in the MIB ("spare"). That is, the second cell information and / or SIB transmission status information may be indicated by at least one of the following: a value set in a field used to indicate (determine) the location of the SSB frequency domain (e.g., the "ssb-SubcarrierOffset" field), a value set in a field used to indicate (determine) the CORESET (e.g., CORESET#0), a value set in a field used to indicate (determine) the search space (e.g., search space#0), and a value set in a field designated as a spare. The control unit 120 may determine the second cell information and / or SIB transmission status information based on at least one of the following: a value set in a field used to indicate (determine) the position of the SSB frequency domain; a value set in a field used to indicate (determine) CORESET (e.g., CORESET #0); a value set in a field used to indicate (determine) a search space (e.g., search space #0); and a value set in a field designated as a spare field.

[0136] Firstly, the control unit 120 may determine whether cell C2 (i.e., cell) is a second cell based on the second cell information in the MIB. For example, the control unit 120 may determine that cell C2 is a second cell if the second cell information indicates that cell C2 is a second cell. That is, for example, the control unit 120 may determine that cell C2 is a second cell if the second cell information contained in the MIB from cell C2 indicates that the cell is a second cell. Alternatively, the control unit 120 may determine whether cell C2 is a second cell based on the second cell information in the MIB and / or UL WUS setting information. For example, if the information indicating the frequency domain offset between the SSB and the number of subcarriers in the second cell information and the overall resource block grid (e.g., "ssb-SubcarrierOffset") is a specific value (e.g., 30 for FR1, or 14 for FR2), or a value within a specific range (e.g., 24 or more and 29 or less for FR1, or 12 or more and 13 or less for FR2), and the cell indicated by the identifier of the second cell included in the UL WUS setting information is indicated to be cell C2, then it may be determined that cell C2 is the second cell. On the other hand, if the second cell information indicates that cell C2 is not the second cell, the control unit 120 may determine that cell C2 is not the second cell.

[0137] The control unit 120 may perform the following determination if cell C2 is the second cell. On the other hand, if cell C2 is not the second cell, the control unit 120 may determine that cell C2 is the first cell. In this case, the control unit 120 may attempt to receive SIB1 as before. That is, the control unit 120 may perform the following determination only if it determines that the cell is the second cell. For example, the control unit 120 may determine the transmission status of SIB1 only if it determines that the cell is the second cell. The control unit 120 may acquire SIB1 transmission status information (values ​​set in SIB1 transmission status information) only if it determines that the cell is the second cell. On the other hand, if the control unit 120 does not determine that the cell is the second cell, it may determine that cell C2 is the first cell. For example, if the control unit 120 does not determine that the cell is the second cell, it does not need to determine the transmission status of SIB1 (it does not need to acquire SIB1 transmission status information (the value set in SIB1 transmission status information)). In other words, if the control unit 120 does not determine that the cell is the second cell, it may determine that SIB1 has been transmitted from cell C2 without determining the transmission status of SIB1. In other words, the control unit 120 may determine whether SIB1 has been transmitted from cell C2 based on whether or not it has determined that the cell is the second cell.

[0138] Secondly, the control unit 120 may determine whether or not to transmit an uplink wake-up signal to cell C2 based on the SIB1 transmission status information in the MIB. Similar to step S211, if the SIB1 transmission status information indicates that SIB1 is being transmitted (i.e., broadcast state), the control unit 120 may determine not to transmit an uplink wake-up signal. On the other hand, if the SIB1 transmission status information indicates that SIB1 is not being transmitted (i.e., non-broadcast state), the control unit 120 may determine to transmit an uplink wake-up signal. As described above, the control unit 120 may determine the transmission status of SIB1 only when it determines that the cell is the second cell. If the SIB1 transmission status information indicates that SIB1 is being transmitted from cell C2, the control unit 120 may acquire SIB1 without transmitting an uplink wake-up signal (i.e., monitor the PDCCH monitoring opportunity for SIB1). Furthermore, if the SIB1 transmission status information indicates that SIB1 has not been transmitted from cell C2, the control unit 120 may acquire SIB1 in response to the transmission of an uplink wake-up signal (i.e., it may monitor the PDCCH monitoring opportunity for SIB1). In other words, the control unit 120 may acquire (confirm) SIB1 transmission status information based on whether it has determined that the cell is the second cell, and then decide whether or not to transmit an uplink wake-up signal based on the acquired (confirmed) SIB1 transmission status information.

[0139] Here, the validity period of the second cell information and / or the SIB1 transmission status information may be set. For example, information indicating the validity period of the second cell information and / or the validity period of the SIB1 transmission status information may be included in the UL WUS setting information. Alternatively, the information indicating the validity period of the second cell information and / or the validity period of the SIB1 transmission status information may be indicated using the MIB fields described above. For example, the control unit 120 may determine the period during which the state of the cell indicated by the second cell information is valid, based on the information indicating the validity period of the second cell information. Alternatively, the control unit 120 may determine the period during which the transmission status of SIB1 indicated by the SIB1 transmission status information is valid, based on the information indicating the validity period of the SIB1 transmission status information. For example, the validity period for the transmission state of SIB1 may be set for the state in which SIB1 is being transmitted (i.e., the transmission state is set to "Broadcasting") or the state in which SIB1 is not being transmitted (i.e., the transmission state is set to "notBroadcasting"). Alternatively, the validity period for the transmission state of SIB1 may be set as the period from the reception of the first SSB (i.e., an SSB burst, an opportunity to receive an SSB) to the reception of the second SSB (i.e., an SSB burst, an opportunity to receive an SSB). For example, the control unit 120 may consider the validity period for the transmission state of SIB1 to be the period from the reception of an SSB containing SIB1 transmission state information (i.e., a field in the MIB) that was used to determine the transmission state of SIB1, to the reception of the next SSB. In other words, if the transmission status is set to "Broadcasting" or "notBroadcasting" based on the SIB1 transmission status information, the transmission status may remain valid until the end of the period corresponding to the transmission of the SSB containing the SIB1 transmission status information. Here, the transmission of the SSB containing the SIB1 transmission status information may be set based on the information used to receive (or transmit) the SSB as described above.For example, if the transmission state is set to "Broadcasting" or "notBroadcasting" based on the SIB1 transmission state information, the transmission state may remain valid until the end of the SSB period determined based on the periodicity set for the transmission of the SSB including the SIB1 transmission state information, and / or the SCS. Here, the SCS of the SSB may be determined based on the information indicating the frequency of the SS block described above (e.g., ARFCN). That is, the control unit 120 may determine the frequency at which the SSB is transmitted based on the information indicating the frequency of the SS block, and determine the SCS of the SSB according to the determined frequency. Here, for example, the value of the SCS corresponding to the frequency at which the SSB is transmitted may be specified in advance by a specification or the like.

[0140] Similarly, for example, if the control unit 120 indicates that the SIB1 transmission status information in the MIB is broadcast or non-broadcast, it may determine that the SIB1 transmission status information is valid for the period from the time the MIB containing the SIB1 transmission status information is received until the next MIB is received. As described above, the period from the time the MIB containing the SIB1 transmission status information (i.e., SSB) is received until the next MIB (i.e., SSB) is received may be determined based on the information indicating the periodicity of the SS block included in the UL WUS setting information (ssb-PeriodicityServingCell), and / or the SCS of the SS block in cell C2. The SCS of the SS block in cell C2 may also be determined based on the frequency of the SS block in cell C2, and / or information indicating the frequency of the SS block in cell C2 included in the UL WUS setting information (e.g., ARFCN). The control unit 120 may determine that the SIB1 transmission status information is invalid if it does not receive the next MIB during the period from the time it receives the MIB containing the SIB1 transmission status information until it receives the next MIB.

[0141] Note that the second cell information and the SIB1 transmission status information may be the same information. For example, certain information (fields) in the MIB (e.g., "ssb-SubcarrierOffset") may indicate the first cell if it shows a first value (or a value within a first range), the second cell and broadcast state if it shows a second value (or a value within a second range), and the second cell and non-broadcast state if it shows a third value (or a value within a third range). In this case, the control unit 120 may determine that cell C2 is not the second cell based on the first value. The control unit 120 may determine that cell C2 is the second cell based on the second value and decide not to transmit the uplink wake-up signal. The control unit 120 may determine that cell C2 is the second cell based on the third value and decide to transmit the uplink wake-up signal. In this example, we will proceed with the assumption that the control unit 120 of UE101 has determined to transmit an uplink wake-up signal.

[0142] Step S313: UE101 may perform the same operations as in steps S113 and / or S213. The control unit 120 of UE101 may, for example, attempt to receive SIB1 within the SIB1 time window based on MIB and / or UL WUS setting information. The control unit 120 may determine the maximum period of the SIB1 time window based on the maximum period information. If SIB1 cannot be received even after the SIB1 time window has elapsed, the control unit 120 of UE101 may perform the operation in step S223 for when SIB1 was not received within the SIB1 reception period.

[0143] Next, we will explain the operation of UE102. As mentioned above, UE101 transmitted an uplink wake-up signal. Now, we will explain the case where UE102 does not transmit an uplink wake-up signal.

[0144] Step S322: UE102 may receive an SSB (SSB burst) from cell C2, similar to step S312, and receive an MIB based on the reception of the SSB. UE102 may also perform the above-described determination.

[0145] In this example, as shown in Figure 8, UE101 receives UL WUS configuration information after transmitting an uplink wake-up signal. Therefore, the second cell information in the MIB may indicate that cell C2 is not the second cell (i.e., it is the first cell), or it may indicate that cell C2 is the second cell if SIB1 is temporarily transmitted in cell C2. Also, the SIB1 transmission status information in the MIB may indicate that it is in a broadcast state because SIB1 is transmitted in cell C2. Accordingly, the control unit 120 of UE102 may, for example, determine not to transmit an uplink wake-up signal based on the information in the MIB. If the control unit 120 determines not to transmit an uplink wake-up signal to cell C2, it may start control to receive SIB1 from cell C2. The control unit 120 of UE102 may also receive UL WUS configuration information based on a request from UE100. The control unit 120 of UE102 may determine, based on the UL WUS setting information, not to transmit an uplink wake-up signal.

[0146] Step S323: The control unit 120 of UE102 may attempt to receive SIB1 based on the MIB, for example. If the control unit 120 is able to receive SIB1, it may perform the same operation as in step S223. The control unit 120 may also perform the same operation as in step S223 if it is unable to receive SIB1. For example, if the control unit 120 is unable to receive SIB1 within the maximum period for receiving SIB1, it may decide to send an uplink wake-up signal to cell C2. Therefore, the control unit 120 may send an uplink wake-up signal to cell C2 even if the SIB1 transmission status indicates that it is in a broadcast state. If the second cell information indicates that cell C2 is the first cell, the control unit 120 may decide not to send an uplink wake-up signal to cell C2 even if it is unable to receive SIB1. In this case, the control unit 120 may attempt to receive other SIB1s in cell C2, or it may consider cell C2 to be banned (bar) (a banned cell).

[0147] The control unit 120 may store a predetermined value as the maximum period for receiving SIB1. If the control unit 120 has not received UL WUS setting information, it may use the predetermined value as the maximum period value. On the other hand, if the control unit 120 has received UL WUS setting information, it may determine the maximum period based on the maximum period information in the UL WUS setting information.

[0148] As described above, the receiving unit 112 may receive the MIB from cell C2. The control unit 120 may determine whether or not to transmit an uplink wake-up signal to cell C2. The control unit 120 may determine whether or not cell C2 is the second cell based on the information in the MIB. If cell C2 is the second cell, the control unit 120 may determine whether or not to transmit an uplink wake-up signal to cell C2 based on the information in the MIB. As a result, even if the UE 100 cannot receive UL WUS setting information, it can determine whether or not to transmit an uplink wake-up signal to cell C2 based on the information in the MIB from cell C2.

[0149] Furthermore, the control unit 120 may decide not to send an uplink wake-up signal to cell C2 if the information in the MIB indicates that SIB1 is being transmitted. The control unit 120 may decide to send an uplink wake-up signal to cell C2 if the information in the MIB indicates that SIB1 is not being transmitted. As a result, the UE 100 can appropriately send an uplink wake-up signal by checking whether or not SIB1 is being transmitted from cell C2 before deciding whether or not to send an uplink wake-up signal.

[0150] Furthermore, the control unit 120 may start control to receive SIB1 if it determines that it will not send an uplink wake-up signal to cell C2. The control unit 120 may determine to send an uplink wake-up signal to cell C2 if it is unable to receive SIB1 within the maximum period for receiving SIB1. By defining a maximum period, the uplink wake-up signal can be sent appropriately compared to the case where UE 101 decides whether or not to send an uplink wake-up signal at any timing. For example, by having UE 101 attempt to receive SIB1 for only a short time, it is possible to avoid sending an uplink wake-up signal even though SIB1 has been sent.

[0151] (Other Embodiments) In the embodiments described above, if a period for receiving SIB1 is set (for example, if period information is received) (based on a request from another UE 100), UE 100 may control itself not to transmit an uplink wake-up signal until that period has elapsed. This avoids the transmission of an unnecessary uplink wake-up signal when SIB1 has already been transmitted. Here, since the reception conditions of the SSB beam may differ among the UE 100s, the intensity (e.g., reception quality, reception power, etc.) of a specific SIB1 transmission (specific SSB beam) requested by another UE 100 may be weak, and reception of that specific SIB1 may fail. Therefore, if a period for receiving a specific SIB1 (only) is set (for example, if period information for setting a period for receiving a specific SIB1 is received) (based on a request from another UE 100), UE 100 may perform control to transmit an uplink wake-up signal even if that period has not elapsed. This enables UE100 to receive SIB1 (or a specific SIB1). UE100 may also request the transmission of a specific SIB1 via an uplink wake-up signal. The uplink wake-up signal may include information specifying a particular SIB1, or it may be transmitted using information indicating a resource for requesting a specific SIB1 included in the UL WUS configuration information.

[0152] UE100 (UE101 and UE102) and base station 200 (base station 201 and base station 202) may perform the above operation when cell C2 is the second cell (on-demand SIB1 cell). Furthermore, UE100 may perform the above operation when it re-selects cell C2, which is the second cell.

[0153] In the third example of operation described above, the control unit 120 made the determination in step S312 based on the information in the MIB, but it is not limited to this. The control unit 120 may make the determination in step S312 based on the UL WUS setting information. Therefore, the UL WUS setting information may include second cell information and / or SIB transmission status information.

[0154] Furthermore, as described above, the UE100 may use, for example, information included in the MIB (e.g., "pdcch-ConfigSIB1") or information indicating the parameters of the common search space #0 included in the UL WUS configuration information (e.g., "searchSpaceZero").

[0155] Of course, the first to third examples of actions described above may be combined and executed as appropriate.

[0156] In the embodiments described above, a mobile communication system based on NR was used as an example for the mobile communication system 1. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a system compliant with either LTE (Long Term Evolution) or another generation system of the 3GPP standard (e.g., 6th generation). The base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol terminations directed to UE100 in LTE. The mobile communication system 1 may be a system compliant with a TS of a standard other than the 3GPP standard. The base station 200 may be an IAB (Integrated Access and Backhaul) donor or IAB node. The base station 200 may be functionally divided into a CU (Central Unit) and a DU (Distributed Unit).

[0157] A program may be provided that causes a computer to execute each process performed by the UE 100 or base station 200. The program may be recorded on a computer-readable medium. Using a computer-readable medium, it is possible to install the program on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transient recording medium. The non-transient recording medium is not particularly limited, but may be a recording medium such as a CD-ROM (Compact Disk Read Only Memory) or a DVD-ROM (Digital Versatile Disc Read Only Memory). Alternatively, the circuits that execute each process performed by the UE 100 or base station 200 may be integrated, and at least a part of the UE 100 or base station 200 may be configured as a semiconductor integrated circuit (chipset, SoC (System On Chip)).

[0158] In the embodiments described above, "transmit" may mean processing at least one layer in the protocol stack used for transmission, or it may mean physically transmitting a signal wirelessly or via a wire. Alternatively, "transmit" may mean a combination of processing at least one layer and physically transmitting a signal wirelessly or via a wire. Similarly, "receive" may mean processing at least one layer in the protocol stack used for reception, or it may mean physically receiving a signal wirelessly or via a wire. Alternatively, "receive" may mean a combination of processing at least one layer and physically receiving a signal wirelessly or via a wire. Similarly, "obtain / acquire" may mean obtaining information from stored information, obtaining information from information received from another node, or obtaining information by generating it. Similarly, the phrases “based on” and “depending on / in response to” do not mean “based solely on” or “in response to” unless otherwise specified. The phrase “based on” means both “based solely on” and “at least partially on.” Similarly, the phrase “in response” means both “at least partially on” and “in at least partially on.” Similarly, “include” and “comprise” do not mean “include only the listed items,” but rather “may include only the listed items,” or “may include additional items in addition to the listed items.” Similarly, in this disclosure, “or” does not mean exclusive OR, but rather logical OR. Furthermore, any reference to elements using designations such as “first,” “second,” etc., as used in this disclosure does not limit the quantity or order of those elements in general. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements.Therefore, references to the first and second elements do not imply that only two elements may be adopted therein, or that the first element must precede the second element in any way. In this disclosure, where articles are added by translation, such as a, an, and the in English, these articles shall be plural unless it is clearly indicated from the context that they are not.

[0159] This disclosure is described in accordance with the embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also includes various modifications and variations within the equivalence. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or fewer of those elements, fall within the scope and concept of this disclosure.

[0160] (Note) The features of the above-described embodiment are noted below.

[0161] (Note 1) A communication device (100) comprising: a receiving unit (112) that receives system information from a first cell, including configuration information used to acquire an on-demand system information block type 1 (SIB1); and a control unit (120), wherein the configuration information includes one or more physical cell identifiers, information indicating the time and frequency resources of a physical random access channel (PRACH) corresponding to the one or more physical cell identifiers, and information indicating a monitoring opportunity for the on-demand SIB1 corresponding to the one or more physical cell identifiers; the receiving unit receives a plurality of synchronization signals and physical broadcast channel blocks (SSBs) from a second cell; and the control unit transmits a request for the on-demand SIB1 to the second cell identified by one of the one or more physical cell identifiers, using the PRACH resources indicated based on the information indicating the time and frequency resources of the PRACH. A communication device that monitors the PDCCH for the on-demand SIB1 in the second cell only in the monitoring opportunity indicated based on information for indicating the monitoring opportunity for the on-demand SIB1, and in the monitoring opportunity corresponding to one of the plurality of SSBs.

[0162] (Note 2) The receiving unit is a communication device according to Note 1 that receives system information, including setting information used to acquire SIB1, from the second cell.

[0163] (Note 3) The communication device according to Note 1 or 2, wherein the control unit monitors the PDCCH for on-demand SIB1 in the cell only during the monitoring opportunity corresponding to one of the multiple SSBs, based on the information contained in the setting information when the multiple SSBs are being transmitted, and attempts to receive the on-demand SIB1 based on the scheduling information carried by the PDCCH.

[0164] (Note 4) The communication device according to any one of Notes 1 to 3, wherein the setting information includes information indicating the period of a time window corresponding to one or more physical cell identifiers, and the control unit monitors the PDCCH for the on-demand SIB1 during the period indicated based on the information indicating the period of the time window.

[0165] (Note 5) The communication device according to any one of Notes 1 to 4, wherein the control unit determines whether or not to send a request for the on-demand SIB1 to the cell based on information indicating a frequency domain offset between the SSB and the overall resource block grid in terms of the number of subcarriers, as indicated by the master information block (MIB) contained in the SSB received from the cell.

[0166] (Note 6) A base station (200) comprising: a transmitting unit that transmits a plurality of synchronization signals and physical broadcast channel blocks (SSBs) in a first cell; a receiving unit that receives a request for an on-demand system information block type 1 (SIB1) in the first cell using the resources of a physical random access channel (PRACH); and a control unit (120) that controls the transmission of downlink control information on the PDCCH for the on-demand SIB1 in the first cell only when there is a monitoring opportunity corresponding to one of the plurality of SSBs, wherein the first cell is identified by one or more physical cell identifiers included in the configuration information included in the system information from the second cell, which is used to acquire the on-demand SIB1; the resources of the PRACH are indicated based on information indicating the time and frequency resources of the PRACH corresponding to the one or more physical cell identifiers; and the downlink control information is transmitted based on information indicating a monitoring opportunity for the PDCCH for the on-demand SIB1 corresponding to the one or more physical cell identifiers.

[0167] (Note 7) A base station according to Note 6, comprising a transmitting unit that transmits system information, including configuration information used to acquire SIB1, in the first cell.

[0168] (Note 8) A communication method performed by a communication device (100), comprising: receiving system information from a first cell, which includes configuration information used to acquire an on-demand system information block type 1 (SIB1); the configuration information includes one or more physical cell identifiers, information indicating the time and frequency resources of a physical random access channel (PRACH) corresponding to the one or more physical cell identifiers, and information indicating a monitoring opportunity for the on-demand SIB1 corresponding to the one or more physical cell identifiers; receiving a plurality of synchronization signals and physical broadcast channel blocks (SSBs) from a second cell; transmitting a request for the on-demand SIB1 to the second cell identified by one of the one or more physical cell identifiers, using the resources of the PRACH indicated based on the information indicating the time and frequency resources of the PRACH; and monitoring the PDCCH for the on-demand SIB1 in the second cell only at the monitoring opportunity corresponding to one of the plurality of SSBs, which is indicated based on the information indicating a monitoring opportunity for the on-demand SIB1.

[0169] (Note 9) The communication method described in Note 8, which receives system information including configuration information used to acquire SIB1 from the second cell.

[0170] (Note 10) The communication method according to Note 8 or 9, wherein, when multiple SSBs are being transmitted, the PDCCH for on-demand SIB1 in the cell is monitored only during the monitoring opportunity corresponding to one of the multiple SSBs, based on the information contained in the setting information, and the PDCCH attempts to receive the on-demand SIB1 based on the scheduling information carried by the PDCCH.

[0171] (Note 11) The communication method according to any one of Notes 8 to 10, wherein the setting information includes information indicating the period of a time window corresponding to one or more physical cell identifiers, and the PDCCH for the on-demand SIB1 is monitored during the period indicated based on the information indicating the period of the time window.

[0172] (Note 12) A communication method according to any one of Notes 8 to 11, which determines whether or not to send a request for the on-demand SIB1 to the cell based on information indicating a frequency domain offset between the SSB and the overall resource block grid in terms of the number of subcarriers, as indicated by the master information block (MIB) contained in the SSB received from the cell.

[0173] (Note 13) A communication device comprising a control unit that determines whether or not to transmit an uplink wake-up signal to a cell for requesting the transmission of a system information block type 1 (SIB1), wherein the control unit determines whether or not to transmit the uplink wake-up signal to the cell based on a period of time for confirming whether or not the SIB1 has been transmitted from the cell.

[0174] (Note 14) The control unit determines the period based on the transmission repetition period of the SIB1, as described in Note 13.

[0175] (Note 15) The communication device according to Note 13 or 14, comprising a receiving unit that receives information for setting the period from another cell that transmits setting information regarding the uplink wake-up signal to the cell.

[0176] (Note 16) A communication device according to any one of Notes 13 to 15, comprising a receiving unit that receives information for independently setting the period for each of the multiple synchronization signals / physical broadcast channel block (SSB) transmissions of the SIB1 in the cell.

[0177] (Note 17) A communication device comprising: a receiving unit that receives setting information relating to the setting of an uplink wake-up signal for requesting the transmission of a system information block type 1 (SIB1); and a control unit that determines whether or not to transmit the uplink wake-up signal to a cell, wherein the setting information includes at least one of information indicating whether or not the SIB1 has been transmitted from the cell, and information relating to the period for receiving the SIB1 from the cell, and the control unit determines whether or not to transmit the uplink wake-up signal to the cell based on at least one of information indicating whether or not the SIB1 has been transmitted from the cell, and information relating to the period for receiving the SIB1 from the cell.

[0178] (Note 18) The communication device according to Note 17, wherein the control unit determines not to transmit the uplink wake-up signal to the cell if the information indicating whether or not the SIB1 is transmitted from the cell indicates that the SIB1 is being transmitted, and determines to transmit the uplink wake-up signal to the cell if the information indicating whether or not the SIB1 is being transmitted from the cell indicates that the SIB1 is not being transmitted.

[0179] (Note 19) The communication device described in Note 17 or 18, wherein the information relating to the period for receiving the SIB1 from the cell is information used in common regardless of whether or not an uplink wake-up is transmitted.

[0180] (Note 20) The communication device according to any one of Notes 13 to 19, wherein the information relating to the period for receiving the SIB1 from the cell includes information for independently setting the period for each transmission of the SIB1 corresponding to each of a plurality of synchronization signal / physical broadcast channel block (SSB) transmissions in the cell.

[0181] (Note 21) The communication device according to any one of Notes 13 to 20, wherein the control unit determines not to transmit the uplink wake-up signal to the cell if it receives the SIB1 from the cell within the period, and determines to transmit the uplink wake-up signal to the cell if it does not receive the SIB1 from the cell before the period has elapsed.

[0182] (Note 22) The communication device according to any one of Notes 13 to 21, wherein the control unit controls a timer for determining the elapsed period, and the control unit determines that the period has elapsed based on the expiration of the timer.

[0183] (Note 23) A communication device comprising: a receiving unit that receives a master information block (MIB) from a cell; and a control unit that determines whether or not to send an uplink wake-up signal to the cell to request the transmission of a system information block type 1 (SIB1), wherein the control unit determines, based on the information in the MIB, whether or not the cell is a cell that supports the transmission of the SIB1 based on the request; and, if the cell is a cell that supports the transmission of the SIB1 based on the request, determines, based on the information in the MIB, whether or not to send an uplink wake-up signal to the cell.

[0184] (Note 24) The communication device as described in Note 23, wherein the control unit determines not to transmit the uplink wake-up signal to the cell if the information in the MIB indicates that the SIB1 is being transmitted, and determines to transmit the uplink wake-up signal to the cell if the information in the MIB indicates that the SIB1 is not being transmitted.

[0185] (Note 25) The communication device according to Note 23 or 24, wherein the control unit determines not to transmit the uplink wake-up signal to the cell, and starts control to receive the SIB1, and determines to transmit the uplink wake-up signal to the cell if the SIB1 cannot be received before the maximum period for receiving the SIB1 has elapsed.

[0186] (Note 26) A base station comprising a transmitting unit that transmits setting information relating to the setting of an uplink wake-up signal for requesting the transmission of a system information block type 1 (SIB1) to a communication device in a cell, wherein the setting information includes at least one of information indicating whether or not the SIB1 has been transmitted from the cell, and information relating to the period for receiving the SIB1 from the cell.

[0187] (Note 27) A base station comprising a transmitting unit that transmits a master information block (MIB) to a communication device in a cell, wherein the MIB includes information for the communication device to determine whether or not to transmit an uplink wake-up signal to the cell when the cell is a cell that supports the transmission of the SIB1 on request.

Claims

1. A communication device (100) comprising: a receiving unit (112) that receives system information from a first cell, including configuration information used to acquire an on-demand system information block type 1 (SIB1); and a control unit (120), wherein the configuration information includes one or more physical cell identifiers, information indicating the time and frequency resources of a physical random access channel (PRACH) corresponding to the one or more physical cell identifiers, and information indicating a monitoring opportunity for the on-demand SIB1 corresponding to the one or more physical cell identifiers; the receiving unit receives a plurality of synchronization signals and physical broadcast channel blocks (SSBs) from a second cell; and the control unit transmits a request for the on-demand SIB1 to the second cell identified by one of the one or more physical cell identifiers, using the PRACH resources indicated based on the information indicating the time and frequency resources of the PRACH. A communication device that monitors the PDCCH for the on-demand SIB1 in the second cell only in the monitoring opportunity indicated based on information for indicating the monitoring opportunity for the on-demand SIB1, and in the monitoring opportunity corresponding to one of the plurality of SSBs.

2. The communication device according to claim 1, wherein the receiving unit receives system information, including setting information used to acquire SIB1, from the second cell.

3. The communication device according to claim 1 or 2, wherein the control unit, when the plurality of SSBs are being transmitted, monitors the PDCCH for on-demand SIB1 in the cell only during the monitoring opportunity corresponding to one of the plurality of SSBs, based on the information contained in the setting information, and attempts to receive the on-demand SIB1 based on the scheduling information carried by the PDCCH.

4. The communication device according to claim 1 or 2, wherein the setting information includes information indicating the period of a time window corresponding to one or more physical cell identifiers, and the control unit monitors the PDCCH for the on-demand SIB1 during the period indicated based on the information indicating the period of the time window.

5. The communication device according to claim 1 or 2, wherein the control unit determines whether or not to transmit a request for the on-demand SIB1 to the cell based on information indicating a frequency domain offset between the SSB and the overall resource block grid in terms of the number of subcarriers, as indicated by the master information block (MIB) contained in the SSB received from the cell.

6. A base station (200) comprising: a transmitting unit that transmits a plurality of synchronization signals and physical broadcast channel blocks (SSBs) in a first cell; a receiving unit that receives requests for on-demand system information block type 1 (SIB1) in the first cell using the resources of a physical random access channel (PRACH); and a control unit (120) that controls the transmission of downlink control information on the PDCCH for the on-demand SIB1 in the first cell only when there is a monitoring opportunity corresponding to one of the plurality of SSBs, wherein the first cell is identified by one or more physical cell identifiers included in the configuration information included in the system information from the second cell, which is used to acquire the on-demand SIB1; the resources of the PRACH are indicated based on information indicating the time and frequency resources of the PRACH corresponding to the one or more physical cell identifiers; and the downlink control information is transmitted based on information indicating a monitoring opportunity for the PDCCH for the on-demand SIB1 corresponding to the one or more physical cell identifiers.

7. The base station according to claim 6, further comprising a transmitting unit that transmits system information, including configuration information used to acquire SIB1, in the first cell.

8. A communication method performed by a communication device (100), comprising: receiving system information from a first cell, which includes configuration information used to acquire an on-demand system information block type 1 (SIB1); the configuration information includes one or more physical cell identifiers, information indicating the time and frequency resources of a physical random access channel (PRACH) corresponding to the one or more physical cell identifiers, and information indicating a monitoring opportunity for the on-demand SIB1 corresponding to the one or more physical cell identifiers; receiving a plurality of synchronization signals and physical broadcast channel blocks (SSBs) from a second cell; transmitting a request for the on-demand SIB1 to the second cell identified by one of the one or more physical cell identifiers, using the resources of the PRACH indicated based on the information indicating the time and frequency resources of the PRACH; and monitoring the PDCCH for the on-demand SIB1 in the second cell only at the monitoring opportunity corresponding to one of the plurality of SSBs, which is indicated based on the information indicating a monitoring opportunity for the on-demand SIB1.

9. The communication method according to claim 8, which receives system information including configuration information used to acquire SIB1 from the second cell.

10. The communication method according to claim 8 or 9, wherein, when multiple SSBs are being transmitted, the PDCCH for on-demand SIB1 in the cell is monitored only during the monitoring opportunity corresponding to one of the multiple SSBs, based on the information contained in the configuration information, and the PDCCH attempts to receive the on-demand SIB1 based on the scheduling information carried by the PDCCH.

11. The communication method according to claim 8 or 9, wherein the setting information includes information indicating the period of a time window corresponding to one or more physical cell identifiers, and the PDCCH for the on-demand SIB1 is monitored during the period indicated based on the information indicating the period of the time window.

12. A communication method according to claim 8 or 9, which determines whether or not to send a request for the on-demand SIB1 to the cell based on information indicating a frequency domain offset between the SSB and the overall resource block grid in terms of the number of subcarriers, as indicated by a master information block (MIB) contained in the SSB received from the cell.

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