Terminal, base station, wireless communication system, and wireless communication method

Abstract

This terminal comprises a communication unit that performs communication with a specific cell of a base station, and a control unit that assumes that communication will be performed with the specific cell without assuming that notification information and system information will be received from the specific cell.

Description

[[Technical Field]]

[0001] The present disclosure relates to a terminal, a base station, a wireless communication system, and a wireless communication method corresponding to a mechanism that can appropriately achieve reduction in power consumption of a network. [[Background Art]]

[0002] The 3rd Generation Partnership Project (3GPP) has standardized the 5th generation mobile communication system (5G, also referred to as New Radio (NR) or Next Generation (NG)), and is further progressing the standardization of next-generation systems called Beyond 5G, 5G Evolution, or 6G.

[0003] Furthermore, in 3GPP, studies for reducing power consumption of networks (base stations) are in progress (for example, Non-Patent Document 1). [[Prior Art Documents]] [[Non-Patent Documents]]

[0004] [[Non-Patent Document 1]] "New SI: Study on network energy savings for NR", RP-213554, 3GPP TSG RAN Meeting #94e, 3GPP, December 2021 [[Summary of the Invention]]

[0005] By the way, although it has been decided to proceed with studies on the reduction of network power consumption, details of the reduction of network power consumption have not been determined.

[0006] Accordingly, the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a terminal, a base station, a wireless communication system, and a wireless communication method corresponding to a mechanism that can appropriately achieve reduction in power consumption of a network.

[0007] One aspect of the disclosure is a terminal comprising a communication unit that performs communication with a specific cell of a base station, and a control unit that assumes communication with the specific cell without assuming the reception of broadcast information and system information from the specific cell.

[0008] One aspect of the disclosure is a base station comprising a communication unit that performs communication with a terminal via a specific cell, and a control unit that assumes communication to be performed with the terminal via the specific cell, without assuming the transmission of broadcast information and system information from the specific cell.

[0009] One aspect of the disclosure is a wireless communication system comprising a terminal and a base station, wherein the terminal comprises a communication unit that performs communication with a specific cell of the base station, and a control unit that assumes communication with the specific cell without assuming the reception of broadcast information and system information from the specific cell.

[0010] One aspect of the disclosure is a wireless communication method comprising the steps of: performing communication with a specific cell having a base station; and assuming communication to be performed with the specific cell without assuming the reception of broadcast information and system information from the specific cell. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic diagram of the overall configuration of the wireless communication system 10. [Figure 2] Figure 2 shows the frequency range used in the wireless communication system 10. [Figure 3] Figure 3 shows an example of the configuration of wireless frames, subframes, and slots used in the wireless communication system 10. [Figure 4] Figure 4 is a functional block diagram of the UE200. [Figure 5] Figure 5 is a functional block diagram of the gNB100. [Figure 6] Figure 6 is a diagram illustrating example 1 of operation. [Figure 7] Fig. 7 is a diagram for describing Operation example 2. [Figure 8] Fig. 8 is a diagram for describing Operation example 2. [Figure 9] Fig. 9 is a diagram for describing Operation example 2. [Figure 10] Fig. 10 is a diagram for describing Operation example 2. [Figure 11] Fig. 11 is a diagram for describing Operation example 3. [Figure 12] Fig. 12 is a diagram for describing Operation example 3. [Figure 13] Fig. 13 is a diagram for describing Operation example 3. [Figure 14] Fig. 14 is a diagram showing an example of the hardware configuration of a gNB 100 and a UE 200. [Figure 15] Fig. 15 is a diagram showing a configuration example of a vehicle 2001. DESCRIPTION OF EMBODIMENTS

[0012] Hereinafter, embodiments will be described with reference to the drawings. The same or similar reference numerals are given to the same functions and configurations, and the description thereof will be omitted as appropriate.

[0013] [Embodiment] (1) Overall schematic configuration of wireless communication system Fig. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to an embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter referred to as NG-RAN 20) and a terminal 200 (hereinafter referred to as UE (User Equipment) 200).

[0014] Note that the wireless communication system 10 may be a wireless communication system conforming to a scheme called Beyond 5G, 5G Evolution or 6G.

[0015] NG-RAN20 includes a base station 100 (hereinafter, gNB 100). Note that the specific configuration of the radio communication system 10 including the number of gNBs 100 and UEs 200 is not limited to the example shown in Fig. 1.

[0016] NG-RAN20 actually includes a plurality of NG-RAN Nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). Note that NG-RAN20 and 5GC may be simply referred to as a "network".

[0017] The gNB 100 is a 5G-compliant radio base station, and performs 5G-compliant radio communication with the UE 200. The gNB 100 and the UE 200 can support Massive MIMO (Multiple-Input Multiple-Output), which generates a more directional beam BM by controlling radio signals transmitted from a plurality of antenna elements, Carrier Aggregation (CA), which uses a plurality of component carriers (CCs) by bundling them, and Dual Connectivity (DC), which performs communication in two or more transport blocks simultaneously between a UE and each of two NG-RAN Nodes.

[0018] In addition, the radio communication system 10 supports a plurality of frequency ranges (FRs). Fig. 2 shows frequency ranges used in the radio communication system 10.

[0019] As shown in Fig. 2, the radio communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows.

[0020] ·FR1: 410 MHz to 7.125 GHz ·FR2: 24.25 GHz to 52.6 GHz In FR1, a Sub-Carrier Spacing (SCS) of 15, 30, or 60 kHz may be used, and a bandwidth (BW) of 5 to 100 MHz may be used. FR2 is a higher frequency than FR1, and a 60 or 120 kHz (240 kHz may be included) SCS may be used, and a bandwidth (BW) of 50 to 400 MHz may be used.

[0021] Note that SCS may also be interpreted as numerology. Numerology is defined in 3GPP TS38.300 and corresponds to a single subcarrier interval in the frequency domain.

[0022] Furthermore, the wireless communication system 10 also supports higher frequency bands than the FR2 frequency band. Specifically, the wireless communication system 10 supports frequency bands exceeding 52.6 GHz up to 71 GHz or 114.25 GHz. Such high frequency bands may be conveniently referred to as "FR2x".

[0023] To address the problem of increased phase noise in high-frequency bands, when using bandwidths exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied.

[0024] Figure 3 shows an example of the configuration of wireless frames, subframes, and slots used in the wireless communication system 10.

[0025] As shown in Figure 3, one slot consists of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the interval (frequency) shown in Figure 3. For example, 480 kHz, 960 kHz, etc., may be used.

[0026] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14 (for example, 28 symbols, 56 symbols). In addition, the number of slots per subframe may differ depending on the SCS.

[0027] The time direction (t) shown in Figure 3 may also be called the time domain, symbol period, or symbol time. The frequency direction may also be called the frequency domain, resource block, subcarrier, or bandwidth part (BWP).

[0028] DMRS is a type of reference signal, prepared for various channels. Here, unless otherwise specified, it may refer to the DMRS for the downlink data channel, specifically the PDSCH (Physical Downlink Shared Channel). However, the DMRS for the uplink data channel, specifically the PUSCH (Physical Uplink Shared Channel), may be interpreted as being the same as the DMRS for the PDSCH.

[0029] DMRS can be used for channel estimation in a device, for example, as part of coherent demodulation in the UE200. DMRS may only be present in the resource block (RB) used for PDSCH transmission.

[0030] A DMRS may have multiple mapping types. Specifically, a DMRS may have mapping type A and mapping type B. In mapping type A, the first DMRS is placed on the second or third symbol of the slot. In mapping type A, the DMRS may be mapped relative to the slot boundary, regardless of where in the slot the actual data transmission begins. The reason the first DMRS is placed on the second or third symbol of the slot may be interpreted as being placed after the control resource sets (CORESET).

[0031] In mapping type B, the first DMRS may be placed on the first symbol of the data allocation. That is, the position of the DMRS may be given relative to where the data is located, rather than relative to the slot boundary.

[0032] Furthermore, DMRS may have multiple types. Specifically, DMRS may have Type 1 and Type 2. Type 1 and Type 2 differ in their frequency domain mapping and the maximum number of orthogonal reference signals. Type 1 is a single-symbol DMRS that can output up to four orthogonal signals, while Type 2 is a double-symbol DMRS that can output up to eight orthogonal signals.

[0033] (2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described.

[0034] First, we will describe the functional block configuration of the UE200.

[0035] Figure 4 is a functional block diagram of the UE200. As shown in Figure 4, the UE200 comprises a wireless signal transmission / reception unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, an encoding / decoding unit 250, a data transmission / reception unit 260, and a control unit 270.

[0036] The wireless signal transceiver unit 210 transmits and receives wireless signals in accordance with NR. The wireless signal transceiver unit 210 supports Massive MIMO, CA which uses multiple CCs bundled together, and DC which communicates simultaneously between the UE and each of the two NG-RAN Nodes.

[0037] In this embodiment, the wireless signal transmission / reception unit 210 may constitute a communication unit that performs communication with a specific cell of the base station (gNB100).

[0038] The amplifier section 220 consists of components such as a PA (Power Amplifier) ​​and an LNA (Low Noise Amplifier). The amplifier section 220 amplifies the signal output from the modulation / demodulation section 230 to a predetermined power level. The amplifier section 220 also amplifies the RF signal output from the wireless signal transmission / reception section 210.

[0039] The modulation / demodulation unit 230 performs data modulation / demodulation, transmit power setting, and resource block allocation for each predetermined communication destination (gNB100 or other gNB). The modulation / demodulation unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM). Furthermore, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

[0040] The control signal / reference signal processing unit 240 performs processing related to various control signals transmitted and received by the UE200, and processing related to various reference signals transmitted and received by the UE200.

[0041] Specifically, the control signal / reference signal processing unit 240 receives various control signals transmitted from the gNB100 via a predetermined control channel, such as control signals for the radio resource control layer (RRC). The control signal / reference signal processing unit 240 also transmits various control signals to the gNB100 via a predetermined control channel.

[0042] The control signal / reference signal processing unit 240 performs processing using reference signals (RS) such as the Demodulation Reference Signal (DMRS) and the Phase Tracking Reference Signal (PTRS).

[0043] DMRS is a terminal-specific, known reference signal (pilot signal) between the base station and the terminal used to estimate the fading channel used for data demodulation. PTRS is a terminal-specific reference signal intended to estimate phase noise, which is a problem in the high-frequency band.

[0044] In addition to DMRS and PTRS, the reference signals may also include Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS) for location information.

[0045] Furthermore, channels include control channels and data channels. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel), Downlink Control Information (DCI) including Random Access Radio Network Temporary Identifier (RA-RNTI), and Physical Broadcast Channel (PBCH), among others.

[0046] Furthermore, data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel), among others. "Data" refers to data transmitted through a data channel. A data channel can also be interpreted as a shared channel.

[0047] Here, the control signal / reference signal processing unit 240 may receive downlink control information (DCI). The DCI includes fields that store existing fields such as DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Assignment), TDRA (Time Domain Resource Assignment), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number), NDI (New Data Indicator), and RV (Redundancy Version).

[0048] The value stored in the DCI Format field is an information element that specifies the DCI format. The value stored in the CI field is an information element that specifies the CC to which the DCI applies. The value stored in the BWP indicator field is an information element that specifies the BWP to which the DCI applies. The BWP that can be specified by the BWP indicator is set by an information element (BandwidthPart-Config) included in the RRC message. The value stored in the FDRA field is an information element that specifies the frequency domain resource to which the DCI applies. The frequency domain resource is identified by the value stored in the FDRA field and an information element (RA Type) included in the RRC message. The value stored in the TDRA field is an information element that specifies the time domain resource to which the DCI applies. The time domain resource is identified by the value stored in the TDRA field and an information element (pdsch-TimeDomainAllocationList, push-TimeDomainAllocationList) included in the RRC message. The time domain resource may also be identified by the value stored in the TDRA field and the default table. The value stored in the MCS field is an information element that specifies the MCS to which the DCI applies. The MCS is identified by the value stored in MCS and the MCS table. The MCS table may be specified by the RRC message or identified by RNTI scrambling. The value stored in the HPN field is an information element that specifies the HARQ Process to which DCI is applied. The value stored in NDI is an information element that determines whether the data to which DCI is applied is initial transmission data. The value stored in the RV field is an information element that specifies the redundancy of the data to which DCI is applied.

[0049] The encoding / decoding unit 250 performs data splitting / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or other gNBs).

[0050] Specifically, the encoding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into predetermined sizes and performs channel coding on the divided data. The encoding / decoding unit 250 also decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0051] The data transmission / reception unit 260 performs the transmission and reception of Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmission / reception unit 260 performs assembly / decomposition of PDUs / SDUs at multiple layers (such as the Media Access Control Layer (MAC), Radio Link Control Layer (RLC), and Packet Data Convergence Protocol Layer (PDCP)). In addition, the data transmission / reception unit 260 performs error correction and retransmission control of data based on HARQ (Hybrid Automatic Repeat Request).

[0052] The control unit 270 controls each functional block that constitutes the UE200. In this embodiment, the control unit 270 is configured to perform communication with a specific cell, without assuming the reception of broadcast information and system information from that specific cell.

[0053] Here, the broadcast information may include information transmitted via the PBCH (Physical Broadcast Channel). For example, the broadcast information may include the PBCH DMRS or the MIB (Master Information Block). The broadcast information may also include a synchronization signal. The synchronization signal may include the PSS (Primary Synchronization Signal) or the SSS (Secondary Synchronization Signal). The broadcast information may also be considered as an SSB (SS PBCH Block). The following examples illustrate the case where the broadcast information is an SSB.

[0054] System information may include a System Information Block (SIB). For example, system information may be considered as SIB Type 1 (hereinafter referred to as SIB1). The following examples illustrate the case where system information is SIB1.

[0055] Communication performed with a specific cell may include receiving a PDCCH or receiving a PDSCH. Communication performed with a specific cell may include sending a PUCCH or sending a PUSCH.

[0056] Certain cells can reduce their transmission power by not performing SSB and SIB1 transmissions. Therefore, these cells may be referred to as NW ES (Energy Saving) Cells.

[0057] Secondly, the functional block configuration of the gNB100 will be described.

[0058] Figure 5 is a functional block diagram of the gNB100. As shown in Figure 5, the gNB100 has a receiving unit 110, a transmitting unit 120, and a control unit 130.

[0059] The receiver 110 receives various signals from the UE200. The receiver 110 may also receive the UL signal via PUCCH or PUSCH.

[0060] The transmitter 120 transmits various signals to the UE200. The transmitter 120 may also transmit DL signals via PDCCH or PDSCH.

[0061] In this embodiment, the receiving unit 110 and the transmitting unit 120 constitute a communication unit that communicates with a terminal (UE200) via a specific cell of the gNB100.

[0062] The control unit 130 controls the gNB100. In this embodiment, the control unit 130 is configured to perform communication with the UE200 via a specific cell, without assuming the transmission of broadcast information (SSB) and system information (SIB1) from a specific cell.

[0063] Communication performed with UE200 via a specific cell may include the transmission of PDCCH or PDSCH. Communication performed with a specific cell may include the reception of PUCCH or PUSCH.

[0064] (3) Challenges 3GPP recognizes the importance of reducing network energy consumption from a sustainable environmental perspective. In particular, it has been decided that efforts should be made to reduce the power consumption of gNB100. However, a concrete mechanism for achieving this reduction has not yet been decided.

[0065] Against this backdrop, the embodiment describes a mechanism for appropriately reducing the power consumption of the network (particularly the gNB100) by introducing a new concept of a specific cell (NW ES Cell) that does not perform SSB and SIB1 transmission.

[0066] (4) Example of operation Next, an example of the operation of the embodiment will be described. In the following example, we will describe the case in which the notification information is SSB and the system information is SIB1.

[0067] (4.1) Example of operation 1 In Operation Example 1, a specific cell (NW ES Cell) that does not perform SSB and SIB1 transmission is newly defined. The NW ES Cell may have the same configuration as an existing cell, except that it does not perform SSB and SIB1 transmission.

[0068] If SSB transmission is not performed, this fact may be notified to UE200 by a higher-layer parameter. If UE200 is notified that SSB transmission is not performed, the parameters related to SSB do not need to be notified to UE200 or set in UE200.

[0069] If the SIB1 transmission is not performed, this fact may be notified to the UE200 via a higher-layer parameter. If the UE200 is notified that the SIB1 transmission will not be performed, the parameters related to SIB1 do not need to be notified to the UE200, nor do they need to be set in the UE200.

[0070] NW ES Cell may be used as P (Primary) Cell, PS (Primary-Secondary) Cell, or S (Secondary) Cell.

[0071] NW ES Cells may be referred to as Non-anchor Cells to distinguish them from Anchor Cells, and may also be referred to as SSB-SIB-less Cells because they do not perform SSB and SIB1 transmissions.

[0072] In Operation Example 1, an Anchor Cell is newly defined as a cell other than the specified cell. The Anchor Cell is a transmitting cell that executes the transmission of SSB and SIB1. The Anchor Cell may have the same configuration as existing cells. The Anchor Cell may also be considered a cell newly defined in relation to the NW ES Cell. Therefore, the Anchor Cell may be understood as a cell different from existing cells.

[0073] An Anchor Cell may have overlapping coverage with an NW ES Cell. An Anchor Cell may also be an adjacent cell to an NW ES Cell.

[0074] Anchor Cell may be used as PCell, PSCell, or SCell.

[0075] For example, as shown in Figure 6, the Anchor Cell is assumed to transmit SSB and SIB1, just like existing cells. The Anchor Cell is assumed to transmit PDCCH and PDSCH, just like existing cells. The Anchor Cell may also be assumed to receive PUCCH and PUSCH, just like existing cells.

[0076] In contrast, unlike existing cells, NW ES Cells do not anticipate the transmission of SSB and SIB1. On the other hand, NW ES Cells anticipate the transmission of PDCCH and PDSCH, similar to existing cells. NW ES Cells may also anticipate the reception of PUCCH and PUSCH, similar to existing cells.

[0077] Thus, UE200 may assume communication with the NW ES Cell (e.g., reception of PDCCH and PDSCH) without assuming reception of SSB and SIB1 from the NW ES Cell. In other words, gNB100 may assume communication with UE200 via the NW ES Cell (e.g., transmission of PDCCH and PDSCH) without assuming transmission of SSB and SIB1 via the NW ES Cell.

[0078] (4.2) Example of operation 2 In Operation Example 2, whether a cell is an NW ES Cell or not is determined by a higher-level parameter. The higher-level parameter may also be an RRC parameter. The following options are possible for Operation Example 2.

[0079] In Option 1, the UE200 may receive parameters that identify the NW ES Cell (hereinafter referred to as upper-layer parameters) from cells other than the NW ES Cell (in this case, the Anchor Cell). Option 1 may also be applied to UE200 that is not in CONNECTED mode in the NW ES Cell.

[0080] Option 1 may introduce a higher-layer parameter that notifies the UE200 that the serving cell is an NW ES Cell. This higher-layer parameter can be thought of as a cell-specific parameter for other cells (i.e., cells other than Anchor Cells). These cell-specific parameters for other cells may be included in one or more parameters selected from ServingCellConfigCommon, ServingCellConfigCommonSIB, and SIB1. These cell-specific parameters for other cells may be called nwEsCell-Index. nwEsCell-Index may be a PhysCellId, a ServCellIndex, or an SCellIndex.

[0081] When nwEsCell-Index is set, UE200 assumes that the cell corresponding to nwEsCell-Index is an NW ES Cell. UE200 does not assume that SSB and SIB1 signals will be received from the NW ES Cell.

[0082] For example, as shown in Opt. 1-1 of Figure 7, the ServingCellConfigCommon received from the Anchor Cell may include PhysCellId as nwEsCell-Index. As shown in Opt. 1-2 of Figure 7, the ServingCellConfigCommon received from the Anchor Cell may include ServCellIndex as nwEsCell-Index. As shown in Opt. 1-3 of Figure 7, the ServingCellConfigCommon received from the Anchor Cell may include SCellIndex as nwEsCell-Index.

[0083] For example, as shown in Opt. 1-4 of Figure 8, the ServingCellConfigCommonSIB received from the Anchor Cell may include PhysCellId as nwEsCell-Index. As shown in Opt. 1-5 of Figure 8, the ServingCellConfigCommonSIB received from the Anchor Cell may include ServCellIndex as nwEsCell-Index. As shown in Opt. 1-6 of Figure 8, the ServingCellConfigCommonSIB received from the Anchor Cell may include SCellIndex as nwEsCell-Index.

[0084] In addition, option 1 may be a combination of two or more options selected from Opt.1-1 to Opt.1-6.

[0085] In Option 2, the UE200 may receive parameters that identify the NW ES Cell from the NW ES Cell (hereinafter referred to as upper-layer parameters). Option 2 may also be applied to the UE200 in CONNECTED mode in the NW ES Cell.

[0086] Option 2 may introduce a higher-layer parameter that notifies the UE200 that the serving cell is an NW ES Cell. This higher-layer parameter can be thought of as a cell-specific parameter for that cell (i.e., an NW ES Cell). This cell-specific parameter may be included in one or more parameters selected from ServingCellConfigCommon for SCell, reconfiguration for SpCells (e.g., PCell and / or PSCell), and ServingCellConfigCommonSIB for initial cell selection of SpCells. This cell-specific parameter may be called nwEsCell or ssb-sib-less. nwEsCell and ssb-sib-less may take the values ​​"true," meaning the cell is an NW ES Cell, or "false," meaning the cell is not an NW ES Cell.

[0087] UE200 assumes a cell is an NW ES Cell if nwEsCell or ssb-sib-less is configured. UE200 does not assume reception of SSB and SIB1 from an NW ES Cell. On the other hand, if nwEsCell or ssb-sib-less is not configured, UE200 assumes the cell is an existing cell or an Anchor Cell.

[0088] For example, as shown in Opt.2-1 of Figure 9, the ServingCellConfigCommon received from the NW ES Cell may include "true" as nwEsCell. As shown in Opt.2-2 of Figure 9, the ServingCellConfigCommon received from the NW ES Cell may also include "true" as ssb-sib-less.

[0089] For example, as shown in Opt. 2-3 of Figure 9, the ServingCellConfigCommonSIB received from the NW ES Cell may include "true" as nwEsCell. As shown in Opt. 2-4 of Figure 9, the ServingCellConfigCommonSIB received from the NW ES Cell may also include "true" as ssb-sib-less.

[0090] In addition, option 2 may be a combination of two or more options selected from Opt.2-1 to Opt.2-4.

[0091] In Operation Example 2, either option 1 or option 2 described above may be adopted. Alternatively, both options 1 and option 2 described above may be adopted.

[0092] (4.3) Example of operation 3 Operation Example 3 describes the parameters (hereinafter referred to as RACH configuration) related to the random access procedure to a specific cell (NW ES Cell). As mentioned above, since the transmission of SIB1 is not expected in the NW ES Cell, the RACH configuration of the NW ES Cell is not provided by the NW ES Cell. Therefore, in Operation Example 3, the UE200 receives information to set the RACH configuration from a cell other than the specific cell (Anchor Cell). The information to set the RACH configuration may simply be referred to as the RACH configuration.

[0093] First, we will describe the Anchor Cell that provides the RACH configuration. The following options are possible for determining the Anchor Cell.

[0094] In Option 1, the Anchor Cell may always be either a PCell or a PSCell. That is, the UE200 may always assume a PCell or a PSCell as the Anchor Cell that provides the RACH configuration for the NW ES Cell.

[0095] In Option 2, the Anchor Cell may be identified by a higher-layer parameter. This higher-layer parameter may be one or more parameters selected from ServingCellConfigCommon and ServingCellConfigCommonSIB. The higher-layer parameter may be called nwEsCell-Index. nwEsCell-Index may be PhysCellId, ServCellIndex, or SCellIndex. In other words, UE200 may assume that the Anchor Cell, which provides the RACH configuration for the NW ES Cell, is a cell that sends a higher-layer parameter that identifies the NW ES Cell.

[0096] Secondly, we will explain the contents of the NW ES Cell's RACH configuration. The following options are possible for the NW ES Cell's RACH configuration.

[0097] In Option 1, as shown in Figure 11, the RACH configuration of the NW ES Cell may be the same as the RACH configuration of the Anchor Cell. The RACH configuration of the NW ES Cell may also be the RACH-ConfigCommon of the Anchor Cell included in the ServingCellConfigCommon or ServingCellConfigCommonSIB sent from the Anchor Cell.

[0098] In Option 2, as shown in Figure 12, the RACH configuration of the NW ES Cell may be configured separately from the RACH configuration of the Anchor Cell. The RACH configuration of the NW ES Cell may be the RACH-ConfigCommon of the NW ES Cell included in the ServingCellConfigCommon or ServingCellConfigCommonSIB sent from the Anchor Cell. The RACH-ConfigCommon of the NW ES Cell is defined separately from the RACH-ConfigCommon of the Anchor Cell. Therefore, the RACH configuration of the NW ES Cell may differ from the RACH configuration of the Anchor Cell.

[0099] It should be noted that the RACH-ConfigCommon of the NW ES Cell included in the ServingCellConfigCommon or ServingCellConfigCommonSIB sent from the Anchor Cell is a newly defined parameter. The newly defined RACH-ConfigCommon of the NW ES Cell may include one or more parameters selected from among es-rach-ConfigCommon included in BWP-UplinkCommon, es-initialUplinkBWP included in UplinkConfigCommon, es-initialUplinkBWP included in UplinkConfigCommonSIB, and es-uplinkConfigCommon included in ServingCellConfigCommon or ServingCellConfigCommonSIB.

[0100] For example, as shown in Opt. 2-1 of Figure 13, the ServingCellConfigCommon received from the Anchor Cell may include es-uplinkConfigCommon in addition to the Anchor Cell's uplinkConfigCommon. As shown in Opt. 2-2 of Figure 13, the uplinkConfigCommon received from the Anchor Cell may include es-initialUplinkBWP in addition to the Anchor Cell's initialUplinkBWP. As shown in Opt. 2-3 of Figure 13, the BWP-UplinkCommon received from the Anchor Cell may include es-rach-ConfigCommon in addition to the Anchor Cell's trach-ConfigCommon.

[0101] In addition, option 2 may be a combination of two or more options selected from Opt.2-1 to Opt.2-3.

[0102] (5) Action and Effects In this embodiment, by introducing a new NW ES Cell that does not anticipate the transmission of SSB and SIB1, a mechanism can be realized that appropriately reduces the power consumption of the network (especially gNB100).

[0103] In this embodiment, parameters identifying the NW ES Cell are transmitted from the NW ES Cell or Anchor Cell. With this configuration, it is possible to appropriately identify NW ES Cells that are not expected to transmit SSB and SIB1.

[0104] In this embodiment, the Anchor Cell transmits the RACH configuration of the NW ES Cell. With this configuration, random access procedures can be properly executed for NW ES Cells that do not expect to transmit SSB and SIB1.

[0105] (6) Other embodiments Although the present invention has been described above in accordance with the embodiments, it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0106] Although not specifically mentioned in the disclosure above, support for Operation Examples 1-3 and the options for each operation example may be determined by one or more elements selected from RRC configuration, MAC CE, DCI, and UE Capability.

[0107] Although not specifically mentioned in the disclosure above, the following UE Capabilities may be defined. The following UE Capabilities may be reported from UE200 to gNB100. For example, a UE Capability may include an information element indicating whether UE200 supports any of the operation examples 1-3 and one or more options of each operation example. A UE Capability may include an information element indicating whether UE200 can perform time / frequency synchronization in the target cell (e.g., NW ES Cell) using an SSB from another cell (e.g., Anchor Cell) without using the target cell's SSB. A UE Capability may include an information element indicating whether UE200 can perform a random access procedure in the target cell (e.g., NW ES Cell) using an SIB1 from another cell (e.g., Anchor Cell) without using the target cell's SIB1.

[0108] Although not specifically mentioned in the disclosure above, in order to distinguish between NW ES Cells and Anchor Cells, NW ES Cells may be referred to as the first cell or first specific cell, and Anchor Cells as the second cell or second specific cell.

[0109] In the disclosures described above, configure, activate, update, indicate, enable, specify, and select may be interpreted as interchangeable. Similarly, link, associate, correspond, and map may be interpreted as interchangeable, and allocate, assign, monitor, and map may also be interpreted as interchangeable.

[0110] Furthermore, "specific," "dedicated," "UE specific," and "UE individual" may be interpreted interchangeably. Similarly, "common," "shared," "group-common," "UE common," and "UE shared" may be interpreted interchangeably.

[0111] The block diagrams (Figures 4 and 5) used in the description of the embodiments above show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0112] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. In any case, as mentioned above, the method of implementation is not particularly limited.

[0113] Furthermore, the gNB100 and UE200 (the device) described above may function as a computer that processes the wireless communication method of this disclosure. Figure 14 shows an example of the hardware configuration of the device. As shown in Figure 14, the device may be configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, and bus 1007.

[0114] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the device may include one or more of the devices shown in the diagram, or it may be configured to omit some of the devices.

[0115] Each functional block of the device (see Figure 4) is implemented by any hardware element of the computer device, or a combination of such hardware elements.

[0116] Furthermore, each function in the device is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of data reading and writing in the memory 1002 and storage 1003.

[0117] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, and so on.

[0118] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. Moreover, the above-mentioned various processes may be executed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line.

[0119] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store a program (program code), software modules, etc., that can execute a method according to one embodiment of this disclosure.

[0120] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. Storage 1003 may also be called an auxiliary storage device. The recording medium described above may also be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0121] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, network controller, network card, communication module, etc.

[0122] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0123] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0124] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0125] Furthermore, the device may include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field-programmable gate array (FPGA), and some or all of the functional blocks may be implemented by such hardware. For example, processor 1001 may be implemented using at least one of these hardware components.

[0126] Furthermore, notification of information is not limited to the embodiments / models described herein and may be carried out by other means. For example, notification of information may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or combinations thereof. RRC signaling may also be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0127] Each aspect / embodiment described herein may be applied to at least one of systems utilizing Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (where x is, for example, an integer or decimal), Future Radio Access (FRA), New Radio (NR), W-CDMA®, GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other appropriate systems, as well as next-generation systems extended based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0128] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0129] The specific operations described in this disclosure as being performed by a base station may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station and at least one other network node (for example, an MME or S-GW, but not limited to these). Although the above example illustrates a case where there is one other network node besides the base station, it may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0130] Information and signals (such as data) can be output from a higher layer (or lower layer) to a lower layer (or higher layer). Input and output may occur via multiple network nodes.

[0131] The input and output information may be stored in a specific location (e.g., memory) or managed using a management table. The input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0132] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0133] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0134] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0135] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0136] The information, signals, etc. described in this disclosure may be represented using any of the various different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0137] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0138] The terms “system” and “network” as used in this disclosure are interchangeable.

[0139] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0140] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not restrictive in any way.

[0141] In this disclosure, terms such as "Base Station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0142] A base station can house one or more (e.g., three) cells (also called sectors). When a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0143] The terms "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base stations and base station subsystems that provide communication services in this coverage.

[0144] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform information-based control or operation.

[0145] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0146] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or several other appropriate terms.

[0147] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0148] Furthermore, the term "base station" in this disclosure may be interpreted as "mobile station" (user terminal, hereinafter the same). For example, each aspect / embodiment of this disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the mobile station may have the functions that a base station has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc. may be interpreted as side channel.

[0149] Similarly, the term "mobile station" in this disclosure may be interpreted as "base station." In this case, the base station may be configured to have the functions that a mobile station has.

[0150] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe.

[0151] A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0152] Numerology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerology may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0153] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). A slot may also be a time unit based on neurology.

[0154] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0155] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0156] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0157] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0158] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0159] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0160] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0161] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0162] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0163] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0164] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0165] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0166] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology on a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0167] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be configured within a single carrier for a UE.

[0168] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0169] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

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

[0171] The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

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

[0173] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0174] Any reference to elements using designations such as “First,” “Second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the First and Second elements do not imply that only two elements may be employed therein, or that the First element must precede the Second element in any way.

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

[0176] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0177] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0178] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0179] Figure 15 shows an example of the configuration of vehicle 2001. As shown in Figure 15, vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0180] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

[0181] The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel performed by the user.

[0182] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2027 installed in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0183] Signals from various sensors 2021-2028 include current signals from the current sensor 2021 that senses motor current, front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0184] The Information Services Unit 2012 consists of various devices for providing various types of information, such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of Vehicle 1.

[0185] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0186] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via its communication port. For example, the communication module 2013 sends and receives data via its communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2028 provided in the vehicle 2001.

[0187] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0188] The communication module 2013 transmits current signals from current sensors input to the electronic control unit 2010 to an external device via wireless communication. The communication module 2013 also transmits, via wireless communication, other signals input to the electronic control unit 2010, including front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0189] The communication module 2013 receives various information (traffic information, signal information, distance information, etc.) transmitted from external devices and displays it on the information service unit 2012 installed in the vehicle. The communication module 2013 also stores the various information received from external devices in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021-2028, etc., installed in the vehicle 2001.

[0190] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way.

[0191] (Note) The disclosure described above may also be expressed as follows:

[0192] The first characteristic is a terminal comprising a communication unit that performs communication with a specific cell of a base station, and a control unit that assumes communication with the specific cell without assuming the reception of broadcast information and system information from the specific cell.

[0193] The second feature is that, in the first feature, the communication unit is a terminal that receives parameters for identifying the specific cell from the specific cell or a cell other than the specific cell.

[0194] The third feature is that, in the first or second feature, the communication unit is a terminal that receives information from cells other than the specified cell to set parameters related to a random access procedure to the specified cell.

[0195] The fourth feature is a base station comprising a communication unit that performs communication with a terminal via a specific cell, and a control unit that assumes communication with the terminal via the specific cell, without assuming the transmission of broadcast information and system information from the specific cell.

[0196] The fifth feature is a wireless communication system comprising a terminal and a base station, wherein the terminal comprises a communication unit that performs communication with a specific cell of the base station, and a control unit that assumes communication with the specific cell without assuming the reception of broadcast information and system information from the specific cell.

[0197] The sixth feature is a wireless communication method comprising the steps of: performing communication with a specific cell owned by a base station; and assuming communication to be performed with the specific cell without assuming the reception of broadcast information and system information from the specific cell. [Explanation of Symbols]

[0198] 10 Wireless communication systems 20 NG-RAN 100 gNB 110 Receiving unit 120 Transmitter 130 Control Unit 200 UE 210 Wireless signal transmission and reception unit 220 Amplifier section 230 Modulation / Demodulation Section 240 Control signal / reference signal processing unit 250 Encoding / Decoding Unit 260 Data transmission / reception unit 270 Control Unit 1001 Processor 1002 memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive Unit 2003 Steering Department 2004 Accelerator pedal 2005 Brake pedal 2006 Shift Lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 Rotation speed sensor 2023 Pneumatic Sensor 2024 Vehicle Speed ​​Sensor 2025 Accelerometer 2026 Brake Pedal Sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driver Support Systems Department 2031 Microprocessor 2032 memory (ROM, RAM) 2033 Communication Port

Claims

1. A receiving unit that receives a first parameter relating to a first cell to which SIB1 (System Information Block Type 1) is not periodically transmitted in a second cell different from the first cell, A terminal having, in the first cell, a transmitting unit that transmits an uplink signal without the receiving unit receiving the SIB1, based on the first parameter.

2. The terminal according to claim 1, wherein the receiving unit receives the first parameter including the cell ID (Identifier) ​​of the first cell.

3. The terminal according to claim 1, wherein the receiving unit receives a second parameter in the first cell indicating that the SIB1 is not transmitted in the first cell.

4. A receiving unit that receives parameters relating to a first cell, which does not periodically transmit a block containing a synchronization signal, in a second cell different from the first cell, It includes a control unit that controls communication in the first cell and the second cell, The receiving unit is a terminal that, based on the parameters, receives a downlink channel in the first cell without receiving the block containing the periodically not transmitted synchronization signal.

5. The terminal according to claim 4, wherein the first cell is a secondary cell.

6. A step of receiving a first parameter relating to a first cell to which SIB1 (System Information Block Type 1) is not periodically transmitted in a second cell different from the first cell, A communication method performed by a terminal, comprising the steps of: transmitting an uplink signal in the first cell without receiving the SIB1, based on the first parameter.

7. A communication method performed by a terminal, A step of controlling communication in the first cell and the second cell, A step of receiving parameters relating to the first cell, which does not periodically transmit blocks containing synchronization signals, in a second cell different from the first cell, A communication method performed by a terminal, comprising the steps of: receiving a downlink channel in the first cell without receiving a block containing the periodically not transmitted synchronization signal, based on the parameters.

8. A communication system comprising a terminal and a base station having a cell, The aforementioned terminal is A receiving unit receives a first parameter relating to a first cell that does not periodically transmit SIB1 (System Information Block Type 1) in a second cell different from the first cell, Based on the first parameter, the first cell includes a transmitting unit that transmits an uplink signal without the receiving unit receiving the SIB1, The aforementioned base station is A communication system having a transmitting unit that transmits the first parameter to the terminal.

9. A communication system comprising a terminal and a base station having a cell, The aforementioned terminal is A receiving unit that receives parameters related to a first cell, which does not periodically transmit blocks containing synchronization signals, in a second cell different from the first cell, It includes a control unit that controls communication in the first cell and the second cell, Based on the parameters, the receiving unit receives the downlink channel in the first cell without receiving the block containing the periodically not transmitted synchronization signal. The aforementioned base station is A communication system having a transmitting unit that transmits the aforementioned parameters to the terminal.

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