Terminal, base station, and communication method

Abstract

This terminal comprises: a reception unit that receives system information including a first maximum value of uplink transmission power, and a radio resource control message including a second maximum value of the uplink transmission power; and a control unit that controls the uplink transmission power by applying the first maximum value or the second maximum value. When both the system information and the radio resource control message are received, the control unit controls the uplink transmission power by applying the second maximum value included in the radio resource control message.

Description

Terminal, Base Station, and Communication Method

[0001] The present disclosure relates to a terminal, a base station, and a communication method for controlling uplink transmission power.

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

[0003] The network can set the maximum value (p-Max) of the uplink transmission power of the terminal in each cell for the terminal using SIB1 (System Information Block 1) and RRC (Radio Resource Control) messages. The terminal controls the uplink transmission power by applying the maximum value included in the SIB1 or RRC message received in each cell. If the SIB1 or RRC message does not include the maximum value, the terminal applies the maximum value of the power class (PC: Power Class) of its own transmission power predetermined by the standard. (Non-Patent Document 1)

[0004] 3GPP TS 38.331 V18.4.0, 3rd Generation Partnership Project;Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 18), 3GPP, January 2025

[0005] Terminals with different maximum uplink transmission power are classified into one of two power classes (for example, general terminals: Power class 3 (p-Max: 23dBm), HP (High Power) terminals: Power class 2 (p-Max: 26dBm)), and it is conceivable that terminals of different power classes will coexist within the same cell in the future. In such cases, the question arises as to how to set the maximum power value for each terminal according to its own power class.

[0006] Therefore, the following disclosure is made in light of these circumstances and aims to provide a terminal, base station, and communication method that can appropriately set the maximum value corresponding to the power class of each terminal, even when terminals of different power classes are mixed within the same cell.

[0007] One aspect of the present disclosure is a terminal (200) comprising: a receiving unit (210) that receives system information including a first maximum value of the uplink transmission power and a radio resource control message including a second maximum value of the uplink transmission power; and a control unit (220) that controls the uplink transmission power by applying the first or second maximum value, wherein the control unit (220) controls the uplink transmission power by applying the second maximum value included in the radio resource control message when it receives both the system information and the radio resource control message.

[0008] One aspect of the present disclosure is a base station (100) comprising: a transmitting unit (120) that transmits system information including a first maximum value of the uplink transmit power and a radio resource control message including a second maximum value of the uplink transmit power; and a receiving unit (110) that receives a signal of the uplink from a terminal that receives both the system information and the radio resource control message, the signal of which the transmit power has been controlled by applying the second maximum value included in the radio resource control message.

[0009] One aspect of the present disclosure is a communication method for a terminal (200) comprising: a receiving step of receiving system information including a first maximum value of the uplink transmit power; a radio resource control message including a second maximum value of the uplink transmit power; and a control step of controlling the uplink transmit power by applying the first or second maximum value, wherein the control step, when both the system information and the radio resource control message are received, controls the uplink transmit power by applying the second maximum value included in the radio resource control message.

[0010] Figure 1 is a schematic diagram of the overall configuration of the wireless communication system. Figure 2 is a diagram showing the frequency range used in the wireless communication system. Figure 3 is a diagram showing an example of the configuration of wireless frames, subframes, slots, and symbols used in the wireless communication system. Figure 4 is a functional block diagram of the base station. Figure 5 is a functional block diagram of the terminal. Figure 6 is a diagram showing the first embodiment. Figure 7 is a diagram showing the second embodiment. Figure 8 is a diagram showing the third embodiment. Figure 9 is a diagram showing an example of priority information (SIB1) in the third embodiment. Figure 10 is a diagram showing an example of priority information (RRC message) in the third embodiment. Figure 11 is a diagram showing an example of the hardware configuration of the base station and terminal. Figure 12 is a diagram showing an example of the vehicle configuration.

[0011] The embodiments will be described below with reference to the drawings. Note that identical or similar reference numerals are used to denote the same functions and components, and their descriptions will be omitted as appropriate.

[0012] (1) Overall schematic diagram 1 of the wireless communication system is an overall schematic diagram of the wireless communication system 10 according to the embodiment. The wireless communication system 10 is a wireless communication system in accordance with 5G and includes terminals (UE: User Equipment, hereinafter also referred to as UE) 200A and 200B, a base station 100, and a network 20. Note that UE200A is, for example, a UE of power class PC3, and 200B is, for example, a UE of power class PC2.

[0013] The wireless communication system 10 may be a wireless communication system conforming to a method called Beyond 5G, 5G Evolution, or 6G, and may partially include a wireless communication system conforming to Long Term Evolution (LTE) or 4G. Furthermore, the wireless communication system 10 may also include other radio access technologies (RATs) besides 5G, such as 4G / LTE. Note that the specific configuration of the wireless system 10 is not limited to the example shown in Figure 1.

[0014] Network 20 includes multiple base stations 100. Base stations 100 are, for example, gNBs, and may also include eNBs, etc. Network 20 is connected to a 5G-compliant core network (5GC, not shown).

[0015] Base station 100 is a 5G-compliant wireless base station and performs 5G-compliant wireless communication with UE200A and UE200B within cell 30, which provides communication services. Base station 100 can support carrier aggregation (CA), which uses multiple component carriers (CCs) bundled together, and dual connectivity (DC), which enables simultaneous communication between base stations, by using Massive Multiple-Input Multiple-Output (Massive MIMO), which generates a more directional beam by controlling the radio signals transmitted from multiple antenna elements.

[0016] The base station 100 and UE200A and 200B can support CA (Carrier Aggregation), which uses multiple CCs (Controllers) in combination, and DC (Digital Control), which enables simultaneous communication between the UE and multiple base stations, by controlling the radio signals transmitted from multiple antenna elements.

[0017] UE200A and UE200B are terminals capable of performing wireless communication in accordance with 5G, and may also perform wireless communication in accordance with communication methods called Beyond 5G, 5G Evolution, or 6G. They may also have the capability to perform wireless communication in accordance with LTE / 4G.

[0018] The UE200 may perform measurement reporting periodically. The UE200 may also perform measurement reporting for each event.

[0019] Furthermore, the wireless communication system 10 may support multiple frequency ranges (FRs). That is, as shown in Figure 2, it may support the following FRs: • FR1: 410 MHz to 7.125 GHz • FR2-1: 24.25 GHz to 52.6 GHz • FR2-2: Over 52.6 GHz to 71 GHz

[0020] In FR1, a subcarrier spacing (SCS) of 15, 30, or 60 kHz and a bandwidth (BW) of 5 to 100 MHz may be used. In FR2-1, an SCS of 60 or 120 kHz (or 240 kHz) and a BW of 50 to 400 MHz may be used.

[0021] Furthermore, as shown in Figure 3, one slot in the wireless communication system 10 consists of 14 symbols. If this configuration is maintained, the larger (wider) the SCS becomes, the shorter the symbol period (and slot period). Note that the SCS is not limited to the frequencies shown in Figure 3, and may be other frequencies such as 480 kHz or 960 kHz.

[0022] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14; for example, it could be 28 or 56 symbols. In addition, the number of slots per subframe may vary depending on the SCS.

[0023] (3) Functional block configuration of the wireless communication system (3.1) Functional block configuration of the base station As shown in Figure 4, the base station 100 includes a wireless communication unit 110, a maximum transmission power value provision unit 120, and a control unit 130.

[0024] The wireless communication unit 110 transmits and receives wireless signals to and from the UE200. The wireless signals include a channel and a reference signal.

[0025] The wireless communication unit 110 transmits and receives wireless signals via control channels or data channels. Control channels include the physical uplink control channel (PUCCH), physical downlink control channel (PDCCH), physical random access channel (PRACH), and physical broadcast channel (PBCH). Data channels include the physical uplink sharing channel (PUSCH) and physical downlink sharing channel (PDSCH). Data may refer to data transmitted via the data channel. Reference signals include the Demodulation Reference Signal (DMRS), Phase Tracking Reference Signal (PTRS), Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS).

[0026] The wireless communication unit 110 can transmit one or more broadcast information. The broadcast information may be a Master Information Block (MIB) or a System Information Block (SIB). The wireless communication unit 110 can also transmit an RRC message to the UE200.

[0027] The wireless communication unit 110 sends a paging message to the UE200. The wireless communication unit 110 receives an initial access request from the UE200 and sends a response to the UE200 containing the necessary initial access procedure. The initial access may be a random access procedure.

[0028] The wireless communication unit 110 can receive information transmitted by the wireless communication unit 210, which will be described later. Furthermore, the wireless communication unit 110 can transmit information received by the wireless communication unit 210, which will also be described later.

[0029] The maximum transmit power value provision unit 120 provides the UE200 with the maximum value (p-Max) of the uplink transmit power applicable to each cell.

[0030] The maximum uplink transmit power (p-Max) is used as the upper limit for the transmit power of each channel when transmitting PUSCH, PUCCH, SRS, and PRACH, as specified in 3GPP TS 38.213.

[0031] The maximum transmit power value provision unit 120 can set the maximum transmit power (p-Max) to the UE200 using system information SIB1 and / or RRC messages (for example, RRCReconfiguration messages).

[0032] Specifically, as specified in 3GPP TS 38.331, the maximum transmit power (p-Max) can be provided as the p-Max of FrequencyInfoULSIB within uplinkConfigCommonSIB, which is included in ServingCellConfigCommonSIB of SIB1. Alternatively, the maximum transmit power (p-Max) can be provided as the p-Max of FrequencyInfoUL within uplinkConfigCommon of ServingCellConfigCommon, which is included in CellGroupConfig of RRCReconfiguration.

[0033] In this embodiment, the maximum transmit power value providing unit 120 may, in a cell where terminals of multiple power classes are mixed, use SIB1 to provide the maximum transmit power (p-Max: 23 dBm) for UE200A of power class PC3, or it may provide the maximum transmit power (p-Max: 26 dBm) for UE200B of power class PC2.

[0034] In this embodiment, the maximum transmit power value provision unit 120 can individually set the maximum value corresponding to each UE200 (UE200A, UE200B) using RRC messages in a cell where terminals of multiple power classes are mixed. For example, for a UE of power class PC3, the maximum transmit power (p-Max) of the RRC message can be set to 23 dBm and provided, and for a UE of power class PC2, the maximum transmit power (p-Max) of the RRC message can be set to 26 dBm and provided.

[0035] Furthermore, in this embodiment, the maximum transmission power value providing unit 120 may include priority information in the SIB1 and / or RRC message, or transmit it as a separate message, indicating which of the maximum values ​​included in the SIB1 and / or the RRC message should be applied preferentially. Specifically, the priority information may be PrioritizedP-max provided as a new information element in FrequencyInfoULSIB, or PrioritizedP-max provided as a new information element in FrequencyInfoUL, as will be described later.

[0036] The maximum transmit power value providing unit 120 of the embodiment may consist of a transmitting unit that transmits system information including a first maximum value of the transmit power of the uplink and a wireless resource control message including a second maximum value of the transmit power of the uplink. The first and second maximum values ​​may be p-Max values. For example, the first maximum value may be the maximum transmit power of power class PC3, 23 dBm, or the maximum transmit power of power class PC2, 26 dBm. Also, for example, the second maximum value may be the maximum transmit power corresponding to power class PC3, 23 dBm, for UE200A of power class PC3, or the maximum transmit power corresponding to power class PC2, 26 dBm, for UE200B of power class PC2. Furthermore, the system information may be SIB1, and the wireless resource control message may be an RRC message (e.g., RRCReconfiguration).

[0037] Furthermore, the wireless communication unit 110 of the embodiment may be configured as a receiving unit that receives the uplink signal, whose transmission power is controlled by applying the second maximum value included in the wireless resource control message, from a terminal that receives both the system information and the wireless resource control message.

[0038] The control unit 130 controls each functional block that constitutes the base station 100. For example, the control unit 130 controls the transmission and reception of wireless signals by the wireless communication unit 110 and the provision of the maximum transmission power value by the maximum transmission power value provision unit 120.

[0039] The control unit 130 receives an initial access request from the UE200 and executes the initial access procedure. The control unit 130 performs scheduling for the UE200. The control unit 130 also performs processing related to control signals, such as radio resource control (RRC) signaling.

[0040] In this embodiment, the control unit 130 may assume that if the UE200 receives both the maximum value included in the SIB1 and the maximum value included in the RRC message, the UE200 will apply the maximum value included in the RRC message to control the transmit power.

[0041] (3.2) As shown in the terminal's functional block configuration diagram 5, the UE200 comprises a wireless communication unit 210, a transmission power control execution unit 220, and a control unit 230.

[0042] The wireless communication unit 210 transmits and receives wireless signals to and from the base station 100.

[0043] The wireless communication unit 210 can receive one or more broadcast information from the base station 100. The broadcast information may be MIB / SIB. The broadcast information may also include an information element indicating the resource for the initial access that the UE 200 performs with the base station 100. The resource for the initial access may mean a RACH resource.

[0044] In an embodiment, the wireless communication unit 210 may receive SIB1 including the maximum value of transmission power (p-Max). In an embodiment, in a cell where terminals with different power classes coexist, the wireless communication unit 210 may receive SIB1 including the maximum value of transmission power corresponding to the power class of the terminal, or may receive SIB1 including the maximum value of transmission power not corresponding to the power class of the terminal. Specifically, for example, both the UE200A with power class PC3 and the UE200B with power class PC2 may receive SIB1 in which the maximum value of transmission power (p-Max) is set to 23 dBm, or may receive SIB1 in which the maximum value of transmission power (p-Max) is set to 26 dBm. Also, the wireless communication unit 210 may receive SIB1 in which a value other than 23 dBm and 26 dBm is set for the maximum value of transmission power (p-Max).

[0045] The wireless communication unit 210 can receive an RRC message from the base station 100. In an embodiment, an RRC message (for example, an RRCReconfiguration message) including the maximum value of transmission power (p-Max) is received. In an embodiment, each terminal may receive an RRC message (for example, an RRCReconfiguration message) including the maximum value of transmission power corresponding to the power class of the terminal. Specifically, the UE200A with power class PC3 can receive an RRC message in which the maximum value of transmission power (p-Max) is set to 23 dBm, and the UE200B with power class PC2 can receive an RRC message in which the maximum value of transmission power (p-Max) is set to 26 dBm.

[0046] The wireless communication unit 210 in an embodiment may include a receiving unit that receives system information including the first maximum value of uplink transmission power and a radio resource control message including the second maximum value of the uplink transmission power.

[0047] Note that the wireless communication unit 210 can receive information transmitted by the wireless communication unit 110. Also, the wireless communication unit 210 can transmit information received by the wireless communication unit 110.

[0048] The transmission power control execution unit 220 executes uplink transmission power control. That is, when the UE 200 transmits PUSCH, PUCCH, SRS, or PRACH, it applies the maximum value of the transmission power and controls the transmission power so as not to exceed this maximum value.

[0049] When the transmission power control execution unit 220 receives SIB1 including the maximum value of the transmission power (p-Max), it applies the maximum value of the transmission power (p-Max) included in SIB1 to execute transmission power control. Also, when the transmission power control execution unit 220 receives an RRC message including the maximum value of the transmission power (p-Max), it applies the maximum value of the transmission power (p-Max) included in the RRC message to execute transmission power control. Further, when the transmission power control execution unit 220 does not find the maximum value of the transmission power (p-Max) in SIB1 or the RRC message, it applies the maximum value of the transmission power corresponding to the terminal's power class defined in the standard to execute transmission power control.

[0050] In an embodiment, when the transmission power control execution unit 220 receives both SIB1 including the maximum value of the transmission power (p-Max: X dBm) and an RRC message including the maximum value of the transmission power (p-Max: Y dBm), it may apply the maximum value of the transmission power (p-Max: Y dBm) included in the RRC message to execute transmission power control. That is, when the transmission power control execution unit 220 receives both SIB1 including the maximum value of the transmission power (p-Max: X dBm) and an RRC message including the maximum value of the transmission power (p-Max: Y dBm), it does not apply or ignores the maximum value of the transmission power (p-Max: X dBm) included in SIB1.

[0051] In addition, in this embodiment, the transmit power control execution unit 220 receives both an SIB1 containing the maximum transmit power (p-Max: X dBm) and an RRC message containing the maximum transmit power (p-Max: Y dBm). If X dBm and Y dBm do not match, the transmit power control execution unit 220 may apply the maximum transmit power (p-Max: Y dBm) included in the RRC message. If X dBm and Y dBm match, the transmit power control execution unit 220 may apply either the maximum transmit power (p-Max: X dBm) included in the SIB1 or the maximum transmit power (p-Max: Y dBm) included in the RRC message.

[0052] In addition, in the embodiment, if the transmit power control execution unit 220 receives both an SIB1 containing the maximum transmit power value (p-Max: X dBm) and priority information, and an RRC message containing the maximum transmit power value (p-Max: Y dBm) and priority information, it may perform transmit power control by applying the maximum value determined based on the priority information.

[0053] In the embodiment, the transmit power control execution unit 220 may be configured as a control unit that controls the transmit power of the uplink by applying the second maximum value included in the wireless resource control message when it receives both the system information and the wireless resource control message.

[0054] Furthermore, in this embodiment, the transmit power control execution unit 220 does not have to apply the maximum value included in the SIB1, even if it newly receives an SIB1 containing the maximum value of the transmit power while in the RRC_CONNECTED state. That is, the transmit power control execution unit 220 may apply the maximum value already held while in the RRC_CONNECTED state. In this embodiment, the transmit power control execution unit 220 may be configured as a control unit that applies the second maximum value included in the wireless resource control message to the control of the transmit power of the uplink, even if it newly receives the system information containing the third maximum value of the transmit power of the uplink while in a network connection state. Note that the RRC_CONNECTED state may be understood as being included in the network connection state. For example, the third maximum value may be the same as the first maximum value included in the system information that has already been received. Also, the third maximum value may be different from the first maximum value.

[0055] Furthermore, in this embodiment, when the transmit power control execution unit 220 receives a new RRC message while in the RRC_CONNECTED state, it may apply the maximum value contained in the newly received RRC message. That is, when the transmit power control execution unit 220 receives a new RRC message while in the RRC_CONNECTED state, it does not need to apply the maximum value already held. In this embodiment, when the transmit power control execution unit 220 receives a new wireless resource control message in the network connection state, it may configure a control unit to control the transmit power of the uplink by applying the fourth maximum value contained in the newly received wireless resource control message. For example, the fourth maximum value may be different from the second maximum value that has already been applied. Alternatively, the fourth maximum value may be the same as the second maximum value.

[0056] Furthermore, in this embodiment, the transmit power control execution unit 220 may discard any previously held maximum values ​​after transitioning from the RRC_CONNECTED state to the RRC_IDLE state or the RRC_INACTIVE state. When the transmit power control execution unit 220 receives an SIB containing a new maximum transmit power value, it may apply the maximum transmit power value included in the SIB 1. In this embodiment, when the transmit power control execution unit 220 receives the system information after the network disconnection state or the communication with the network has changed to a non-operating state, it may configure a control unit to control the transmit power of the uplink by applying the fifth maximum value included in the system information. Note that the RRC_IDLE state may be understood as being included in the network disconnection state, and the RRC_INACTIVE state may be understood as being included in the non-operating state of communication with the network. For example, the fifth maximum value may be the same as or different from the first maximum value included in the previously received system information.

[0057] The control unit 230 controls each functional block that constitutes the UE200. For example, the control unit 230 controls the transmission and reception of wireless signals by the wireless communication unit 210 and the transmission power control execution unit 220.

[0058] (4) Operation of the wireless communication system (4.1) Challenges In the future, it is conceivable that terminals of different power classes will be mixed within the same cell. When terminals of different power classes are mixed within the same cell in this way, the problem is how to set the maximum value for each terminal according to its own power class.

[0059] For example, currently, if a terminal receives both the maximum value included in the RRC message and the maximum value included in the SIB, the standard does not specify which maximum value should be applied as the maximum uplink transmit power. Therefore, among terminals that receive both, there may be some that operate according to the maximum value included in SIB1.

[0060] Such terminals, even if they receive the maximum value corresponding to their power class in an RRC message, will apply the maximum value included in the SIB if they have received an SIB1. As a result, as mentioned above, general terminals may transmit at levels exceeding the expected maximum value (23 dBm), and HP terminals may not transmit at the expected maximum value (26 dBm), making it difficult to provide services according to the terminal's power class.

[0061] The technical challenges addressed in this disclosure are not limited to those mentioned above, and other technical challenges not mentioned here will be clearly understood by a person with ordinary skill in the art to which this disclosure pertains, based on the description herein.

[0062] (4.2) Operation Example (4.2.1) Operation Example 1 Figure 6 shows the first embodiment. The first embodiment is an example in which the UE200 receives the maximum value of the transmitted power in both system information and RRC messages in a cell where terminals of multiple power classes are mixed.

[0063] In Figure 6, the base station 100 can transmit an SIB1 that includes the maximum transmit power (p-Max: X dBm). For example, if there is a UE200A of power class PC3 and a UE200B of power class PC2 in the cell, the base station 100 may set X dBm to the maximum value of 23 dBm corresponding to power class PC3, or it may set X dBm to the maximum value of 26 dBm corresponding to power class PC2.

[0064] Furthermore, the base station 100 can send an RRC message (for example, an RRCReconfiguration message) to a UE200 that is in the RRC Connected state, which includes the maximum transmit power (p-Max: Y dBm) corresponding to the power class of the UE200. Specifically, if the UE200 is a UE200A with power class PC3, the maximum transmit power Y dBm of the RRC message sent to UE200A may be set to 23 dBm, which corresponds to power class PC3. Also, if the UE200 is a UE200B with power class PC2, the maximum transmit power Y dBm of the RRC message sent to UE200B may be set to 26 dBm, which corresponds to power class PC2.

[0065] When the UE200A receives both an SIB1 and an RRC message, it controls the uplink transmit power by applying the maximum transmit power of 23 dBm included in the RRC message, regardless of the maximum transmit power included in the SIB1.

[0066] Similarly, if the UE200B receives both an SIB1 and an RRC message, it controls the uplink transmit power by applying the maximum transmit power of 26 dBm included in the RRC message, regardless of the maximum transmit power included in the SIB1.

[0067] Thus, according to the first embodiment, when the UE200 receives both an SIB1 containing the maximum transmit power (p-Max: X dBm) and an RRC message containing the maximum transmit power (p-Max: Y dBm), it applies the maximum value Y dBm included in the RRC message. This allows the maximum transmit power corresponding to the terminal's power class to be appropriately set for each terminal (UE200A, UE200B).

[0068] Furthermore, in the first embodiment, if the maximum value (p-Max: X dBm) included in SIB1 does not match the maximum value (p-Max: Y dBm) included in the RRC message, UE200 will apply the maximum value (p-Max: Y dBm) included in the RRC message. Alternatively, if the maximum value (p-Max: X dBm) included in SIB1 does not match the maximum value (p-Max: Y dBm) included in the RRC message, UE200 will not apply the maximum value (p-Max: X dBm) included in SIB1.

[0069] Currently, there is no specification as to which maximum value to apply to control uplink transmission power when a terminal receives both the maximum value included in the RRC message and the maximum value included in the SIB. It is conceivable that some terminals may operate according to the maximum value included in SIB1. In such cases, even if the terminal receives the maximum value corresponding to its power class in the RRC message, if it has received SIB1, the maximum value included in SIB1 will be applied. Therefore, even if the maximum value is set to 23dBm in the RRC message for a general terminal, if it receives an SIB1 that sets the maximum value to 26dBm, the general terminal will apply the 26dBm included in SIB1 as the maximum value, resulting in the general terminal transmitting at a level exceeding the expected maximum value (23dBm). Similarly, even if the maximum value is set to 26dBm in the RRC message for an HP terminal, if it receives an SIB1 that sets the maximum value to 23dBm, the HP terminal will apply the 23dBm included in SIB1 as the maximum value, resulting in the HP terminal not transmitting at the expected maximum value (26dBm). However, by applying the first embodiment, it becomes possible to set a maximum value corresponding to the power class of each terminal.

[0070] Next, the maximum transmit power set for the UE200 may be handled according to the following options.

[0071] Option 1) The UE200 may store and retain the maximum value Y dBm applied to the transmit power control while in the RRC_CONNECTED state, and continue to apply the retained maximum value to perform transmit power control.

[0072] Option 2) While in the RRC_CONNECTED state, if UE200 receives a new SIB1 containing the maximum transmit power, it may choose not to apply or ignore the maximum transmit power contained in SIB1. That is, even if UE200 receives a new SIB1 containing the maximum transmit power, it can control the transmit power by applying the maximum value it already holds, without replacing it with the maximum transmit power contained in SIB1. This maximum transmit power contained in SIB1 may be the same as or different from the maximum value (p-Max: X dBm) contained in an SIB that was already received.

[0073] Option 3) While in the RRC_CONNECTED state, if UE200 receives a new RRC message containing the maximum transmit power, it may update the already held maximum value with the maximum value contained in the newly received RRC message. That is, when UE200 receives a new RRC message containing the maximum transmit power, it may apply the maximum value contained in the newly received RRC message to control the transmit power. This maximum value contained in the newly received RRC message may be a different value from or the same value as the already held maximum value (p-Max: Y dBm).

[0074] Option 4) The UE200 may also discard the maximum value it had held up to that point after transitioning from the RRC_CONNECTED state to the RRC_IDLE or RRC_INACTIVE state. The discard of the held maximum value may occur when transitioning to the RRC_Idle or RRC_Inactive state, or it may be updated to the maximum value contained in the SIB1 when a new SIB1 containing the maximum transmit power is received. The maximum value contained in the SIB1 received after transitioning to the RRC_IDLE or RRC_INACTIVE state may be the same value as the maximum value (p-Max: X dBm) contained in the previously received SIB1, or it may be a different value.

[0075] Based on the above, the UE200 can control the transmit power by applying the maximum value corresponding to the power class while in the RRC_CONNECTED state. Furthermore, the UE200 can clear the previous maximum value by transitioning from the RRC_CONNECTED state to the RRC_IDLE state or the RRC_INACTIVE state.

[0076] (4.2.2) Operation Example 2 Figure 7 shows a second embodiment. The second embodiment is an example in which the UE200 receives the maximum value of the transmitted power in system information or RRC messages in a cell where terminals of multiple power classes are mixed.

[0077] In Figure 7, base station 100 can transmit an SIB1 including the maximum transmit power (p-Max: X dBm) and can transmit an RRC message including the maximum transmit power (p-Max: Y dBm).

[0078] The UE200 does not apply or ignores the maximum transmit power values ​​X dBm even if the received SIB1 contains a maximum transmit power value of Y dBm, or even if the received RRC message contains a maximum transmit power value of Y dBm. Instead, the UE200 controls the transmit power by applying the maximum transmit power value corresponding to the UE200's power class as defined in the standard. For example, a UE200A with power class PC3 applies the maximum value of 23 dBm corresponding to PC3, and a UE200B with power class PC2 applies the maximum value of 26 dBm corresponding to PC2 to control the transmit power.

[0079] Thus, in the second embodiment, even if the SIB1 or RRC message includes the maximum transmit power, the maximum transmit power corresponding to the terminal's power class as defined in the standard can be set for each terminal (UE200A, UE200B), just as in the case where the SIB1 or RRC message does not include the maximum transmit power.

[0080] Furthermore, the second embodiment may be applied only to a specific frequency band, or only to a terminal of a specific power class (for example, the UE200A of PC3).

[0081] (4.2.3) Operation Example 3 Figure 8 shows a third embodiment. The third embodiment is an example in which the UE200 receives the maximum transmit power and priority information in both system information and RRC messages in a cell where terminals of multiple power classes are mixed.

[0082] In Figure 8, base station 100 can transmit SIB1 including the maximum transmit power (p-Max: X dBm) and priority information.

[0083] Figure 9 is a diagram illustrating priority information and shows an example of FrequencyInfoUL-SIB included in SIB1. In Figure 9, FrequencyInfoUL-SIB has PrioritizedP-max as a new information element, which is an indication of priority information. PrioritizedP-max is specifically indicated in SIB1 or RRCReconfiguration.

[0084] Furthermore, the base station 100 can send an RRC message to a UE200 that is in the RRC Connected state, which includes the maximum transmit power (p-Max: Y dBm) corresponding to the power class of the UE200 and priority information.

[0085] Figure 10 is a diagram illustrating priority information and shows an example of FrequencyInfoUL included in the RRCReconfiguration message. In Figure 10, FrequencyInfoUL has PrioritizedP-max as a new information element, which is an indication of priority information. PrioritizedP-max is specifically indicated in SIB1 or RRCReconfiguration.

[0086] If the UE200 receives both an SIB1 and an RRC message, it determines whether to apply the maximum transmit power X dBm included in the SIB1 or the maximum transmit power Y dBm included in the RRC message, based on the priority information included in the SIB1 or the priority information included in the RRC message.

[0087] In other words, if PrioritizedP-Max is set to "SIB1", the UE will preferentially apply the maximum value X dBm of SIB1 to control the transmit power. Also, if PrioritizedP-Max is set to "RRCReconfiguration", the UE will preferentially apply the maximum value Y dBm of the RRCReconfiguration message to control the transmit power.

[0088] This allows the UE200 to be directed to the maximum value corresponding to each UE's power class, according to the PrioritizedP-Max indication included in either the SIB1 or the RRC message, even if it has received both an SIB1 containing the maximum transmit power X dBm and an RRC message containing the maximum transmit power Y dBm.

[0089] In Figure 8, an example is shown where both the SIB1 and RRC messages contain priority information; however, only one of them may contain priority information. Furthermore, priority information does not necessarily have to be included in the SIB1 and RRC messages; it may be transmitted using a separate message.

[0090] According to the embodiments described above, the following effects and advantages can be obtained.

[0091] Even in a cell containing a mix of UE200s with different power classes, the UE200 can set a maximum value corresponding to its power class even when receiving both an SIB1 message containing the maximum transmit power (p-Max: X dBm) and an RRC message containing the maximum transmit power (p-Max: Y dBm).

[0092] Even when UE200s with different power classes are mixed within a cell, the base station 100 can set the maximum value corresponding to the power class of each UE200.

[0093] (6) Other Embodiments Although the contents of the present invention have been described above in accordance with the embodiments, it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0094] For example, in the embodiments described above, Power class 2 (p-Max: 26 dBm) was used as an example of the HP terminal 200B, but the invention is not limited to this example. The HP terminal 200B may also include Power class 1.5 (p-Max: 29 dBm), Power class 1 (p-Max: 31 dBm), and may include any power classes that may be defined in the future.

[0095] In this disclosure, multiple options and variations may be combined as a single option / variation.

[0096] The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining software with the one or more of the above devices.

[0097] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0098] For example, the base station 100 and terminal 200 in one embodiment of the present disclosure may function as computers that process the wireless communication method of the present disclosure. Figure 11 is a diagram showing an example of the hardware configuration of the base station 100 and terminal 200 according to one embodiment of the present disclosure. The above-mentioned base station 100 and terminal 200 may be physically configured as computer devices including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0099] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 100 and terminal 200 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0100] Each function in the base station 100 and terminal 200 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0101] 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.

[0102] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. Furthermore, although it has been explained that the above processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line.

[0103] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of the present disclosure.

[0104] The storage 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., Compact Disc, Digital Multipurpose Disc, Blu-ray® Disc), a smart card, flash memory (e.g., a card, stick, key drive), a floppy® disk, a magnetic strip, etc. The storage 1003 may also be called an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0105] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0106] 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).

[0107] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0108] Furthermore, the base station 100 and terminal 200 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0109] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or combinations thereof. RRC signaling may also be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0110] Each aspect / embodiment described herein may apply to systems utilizing Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (where x is, for example, an integer or decimal), Future Radio Access (FRA), New Radio (NR), New radio access (NX), Future generation radio access (FX), W-CDMA®, GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other appropriate systems, as well as at least one of the next-generation systems that are extended, modified, created, or defined based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0111] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be reordered, provided they do not contradict each other. For example, the methods described in this disclosure present various step elements using exemplary order and are not limited to the specific order presented.

[0112] The specific operations described in this disclosure as being performed by a base station may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station and at least one other network node (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station, it may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0113] 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.

[0114] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0115] The determination may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0116] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] The terms “system” and “network” as used in this disclosure are interchangeable.

[0122] 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.

[0123] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0124] 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.

[0125] A base station can house one or more (e.g., three) cells (also called sectors). If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which may be provided with communication services by a base station subsystem (e.g., a Remote Radio Head, RRH). The terms "cell" or "sector" refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems providing communication services in that coverage.

[0126] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform control or operation based on the information.

[0127] In this disclosure, terms such as “terminal,” “user terminal,” “Mobile Station (MS),” and “User Equipment (UE)” may be used interchangeably.

[0128] 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.

[0129] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object, and its speed of movement is arbitrary. This also includes the case when the mobile body is stationary. The mobile body includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and items mounted on them. The mobile body may also be a mobile body that moves autonomously based on operation commands. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0130] Furthermore, the term "base station" in this disclosure may be interpreted as "terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between multiple terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the terminal 200 may have the functions that the base station 100 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.

[0131] Similarly, the term "terminal" in this disclosure may be replaced with "base station." In this case, the base station 100 may be configured to have the same functions as the terminal 200 described above.

[0132] Figure 12 shows an example of the configuration of vehicle 2001. As shown in Figure 12, 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.

[0133] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

[0134] The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0135] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2027 installed in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an Electronic Control Unit (ECU).

[0136] Signals from various sensors 2021 to 2029 include current signals from the current sensor 2021 that senses motor current, front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0137] The Information Services Unit 2012 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including car navigation systems, audio systems, speakers, televisions, and radios, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via communication modules 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001.

[0138] The Information Services Unit 2012 may include input devices that accept input from external sources (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) and output devices that output to external sources (e.g., displays, speakers, LED lamps, touch panels, etc.).

[0139] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), Artificial Intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0140] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via the communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2029 provided in the vehicle 2001.

[0141] 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.

[0142] The communication module 2013 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 2021 to 2029 input to the electronic control unit 2010, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021 to 2029, the information service unit 2012, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0143] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on the information service unit 2012 installed in the vehicle. The information service unit 2012 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013).

[0144] Furthermore, the communication module 2013 stores various information received from external devices in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021 to 2029, etc., which are provided in the vehicle 2001.

[0145] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, or inquiring (e.g., searching in a table, database, or other data structure), or ascertaining. “Determining” may also include receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, or accessing (e.g., accessing data in memory). Furthermore, “determining” may include resolving, selecting, choosing, establishing, or comparing. In other words, "judgment" and "decision" can include considering that some action has been "judged" or "decided." Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0146] The terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0147] The reference signal may also be abbreviated as RS and may be called Pilot depending on the applicable standard.

[0148] 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."

[0149] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0150] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0151] 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.

[0152] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0153] 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.

[0154] 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.

[0155] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (or PUSCH) mapping type B.

[0156] 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.

[0157] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1 to 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0158] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal to allocate radio resources (such as the frequency bandwidth and transmission power available to each terminal) in TTI units. However, the definition of TTI is not limited to this.

[0159] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the actual time interval (e.g., number of symbols) in which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0160] 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.

[0161] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in LTE Rel. 8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a subslot, or a slot.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0166] 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.

[0167] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0168] 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.

[0169] 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".

[0170] 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.

[0171] 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.

[0172] 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."

[0173] 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.

[0174] This application is based on Japanese Patent Application No. 2025-012478, filed on January 28, 2025. All of its contents are included herein.

[0175] 10 Wireless communication system 20 Network 30 Cell 100 Base station 110 Wireless communication unit 120 Maximum transmission power value provision unit 130 Control unit 200A, 200B Terminal 210 Wireless communication unit 220 Transmission power control execution unit 230 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023, air pressure sensor 2024, vehicle speed sensor 2025, acceleration sensor 2026, brake pedal sensor 2027, shift lever sensor 2028, object detection sensor 2029, accelerator pedal sensor 2030, driver assistance system unit 2031, microprocessor 2032, memory (ROM, RAM) 2033, communication port (IO port)

Claims

1. A terminal comprising: a receiving unit that receives system information including a first maximum value of the uplink transmission power and a wireless resource control message including a second maximum value of the uplink transmission power; and a control unit that controls the uplink transmission power by applying the first maximum value or the second maximum value, wherein the control unit, when it receives both the system information and the wireless resource control message, controls the uplink transmission power by applying the second maximum value included in the wireless resource control message.

2. The terminal according to claim 1, wherein, in a network connection state, even if the control unit newly receives the system information including the third maximum value of the uplink transmission power, it applies the second maximum value included in the wireless resource control message to the control of the uplink transmission power.

3. The terminal according to claim 1, wherein, when the control unit receives a new wireless resource control message while the network connection is active, it applies the fourth maximum value included in the newly received wireless resource control message to control the transmission power of the uplink.

4. The terminal according to claim 1, wherein, when the control unit receives the system information after the network disconnection state or the communication with the network has changed to an inoperable state, it applies the fifth maximum value included in the system information to control the transmission power of the uplink.

5. A base station comprising: a transmitting unit that transmits system information including a first maximum value of the uplink transmit power and a radio resource control message including a second maximum value of the uplink transmit power; and a receiving unit that receives a signal of the uplink from a terminal that receives both the system information and the radio resource control message, the signal of which the transmit power has been controlled by applying the second maximum value included in the radio resource control message.

6. A terminal communication method comprising: a receiving step of receiving system information including a first maximum value of the uplink transmission power and a radio resource control message including a second maximum value of the uplink transmission power; and a control step of controlling the uplink transmission power by applying the first maximum value or the second maximum value, wherein the control step, when both the system information and the radio resource control message are received, controls the uplink transmission power by applying the second maximum value included in the radio resource control message.

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