Base station, terminal, and wireless communication system

Abstract

This base station is capable of controlling wireless measurement performed by a terminal, with the base station forming a first cell. The base station has a transmission unit and a control unit. The transmission unit transmits, to the terminal, a first signal which includes first information relating to the measurement of a third signal transmitted into a second cell different from the first cell or / and includes second information relating to the second cell. The control unit, in order to cause the terminal to perform processing on the third signal, performs control of transmitting a second signal to the terminal or to a device that forms another cell to which the third signal is transmitted. The transmission unit transmits the second signal in accordance with the control by the control unit.

Description

Base station, terminal, and wireless communication system

[0001] The present invention relates to a base station, a terminal, and a wireless communication system.

[0002] In today's networks, traffic from mobile devices (smartphones and feature phones) accounts for the majority of network resources, and traffic from mobile devices is expected to continue to grow.

[0003] In addition to traffic used by mobile terminals, for example, IoT (Internet of Things) services (for example, monitoring systems for transportation systems, smart meters, devices, etc.) are being deployed. Therefore, networks are required to support services with diverse requirements. In order to support such diverse services, for example, in communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (for example, Non-Patent Documents 1 to 14), standards are being developed assuming support for many use cases classified as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications). Furthermore, the communication standards for fifth-generation mobile communications (5G or NR (New Radio)) also stipulate technologies for reducing power consumption.

[0004] Currently, the 3GPP (3rd Generation Partnership Project (registered trademark)) is studying a technology to reduce transmission of SSB (Synchronization Signals / Physical Broadcast Channel Block) as a new technology to reduce power consumption in networks. SSB is normally transmitted periodically for various purposes such as channel estimation, synchronization, and interference measurement. Among these, the technology under study is on-demand SSB (Synchronization Signals / Physical Broadcast Channel Block) (Non-Patent Document 15). On-demand SSB is a technology that transmits SSB only when necessary, rather than constantly transmitting SSB. For example, when a terminal is connected to a P cell (primary cell), in order to reduce power consumption, the S cell (secondary cell) does not transmit SSB, and transmits S cell SSB when the terminal connected to the P cell needs to measure SSB from the S cell.

[0005] 3GPP TS 37.324 V17.0.03GPP TS 37.340 V17.7.03GPP TS 38.201 V17.0.03GPP TS 38.202 V17.5.03GPP TS 38.211 V17.6.03GPP TS 38.212 V17.7.03GPP TS 38.213 V17.8.03GPP TS 38.214 V17.8.03GPP TS 38.215 V17.4.03GPP TS 38.300 V17.7.03GPP TS 38.321 V17.7.03GPP TS 38.322 V17.3.03GPP TS 38.323 V17.5.03GPP TS 38.331 V17.7.0RP-234065

[0006] Meanwhile, on-demand SSB has only recently been discussed, and the specifics of how to actually control the terminal or the S cell have not yet been decided. Furthermore, to execute on-demand SSB, control between devices (e.g., control between the base station forming the P cell and the terminal) is required, but nothing has been decided on this either. If this control is not decided, for example, if the terminal does not know the transmission timing of the SSB transmitted by the device forming the S cell, it may not be able to measure the SSB. Furthermore, similar problems may occur when a similar situation occurs outside the S cell.

[0007] The disclosed technology has been made in view of the above, and provides a method that enables a terminal to measure a signal transmitted from an SCell.

[0008] In one aspect, a base station is provided that forms a first cell, and that has a transmitting unit that can transmit a first signal to a terminal, the first signal including first information regarding measurement of a third signal transmitted within a second cell different from the first cell and / or second information regarding the second cell, and a control unit that can control the transmission of a second signal to the terminal or another base station that transmits the third signal, so that the terminal can process the third signal.

[0009] At the terminal, it is possible to make the signals transmitted from the SCell measurable.

[0010] FIG. 1 is a diagram showing an example of a network configuration according to a first embodiment. FIG. 2 is a diagram showing an example of a functional configuration block diagram of a base station in a wireless communication system according to the first embodiment. FIG. 3 is a diagram showing an example of a functional configuration block diagram of a terminal in the wireless communication system according to the first embodiment. FIG. 4 is a diagram showing an example of an operation flow of a base station according to the first embodiment. FIG. 5 is a diagram showing an example of a sequence of a communication system according to the second embodiment. FIG. 6 is a diagram showing an example of a control flow of a terminal according to the second embodiment. FIG. 7 is a diagram showing an example of measurement control of a terminal according to information included in a first signal. FIG. 8 is a diagram showing a first example of information included in a second signal. FIG. 9 is a diagram showing a second example of information included in a second signal. FIG. 10 is a diagram showing an example of a sequence of a communication system according to the third embodiment. FIG. 11 is a diagram showing an example of a sequence of a communication system according to the fourth embodiment. FIG. 12 is a diagram showing an example of a sequence of a communication system according to the fifth embodiment. FIG. 13 is a diagram showing an example of a hardware configuration of a base station. FIG. 14 is a diagram showing an example of a hardware configuration of a terminal.

[0011] The present embodiment will be described in detail below with reference to the drawings. The problems and examples in this specification are merely examples and do not limit the scope of the rights of the present application. In particular, even if the expressions used are different, the technology of the present application can be applied as long as they are technically equivalent, and do not limit the scope of the rights. Furthermore, each embodiment can be combined as appropriate within the scope of not causing any contradiction in the processing content.

[0012] Furthermore, the terms used and technical contents described in this specification may be those described in specifications and contributions as standards related to communication such as 3GPP, as appropriate. Examples of such specifications include those described in Non-Patent Documents 1 to 14.

[0013] Hereinafter, embodiments of a base station, a terminal, a wireless communication system, and a communication method disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the disclosed technology is not limited to the following embodiments. First Embodiment

[0014] FIG. 1 is a diagram illustrating an example of a wireless communication system 1 according to a first embodiment. The wireless communication system 1 includes base stations 100A and 100B and a terminal 200. The base station 100A forms a cell C10A. The base station 100B forms a cell C10B. The terminal 200 is located in the cell C10A and the cell C10B. When the base stations 100A and 100B are not distinguished from each other, they are simply referred to as the base stations 100. In the following description, the cell C10A formed by the base station 100A is referred to as the primary cell (hereinafter referred to as the P cell C10A), and the cell C10B formed by the base station 100B is referred to as the secondary cell (hereinafter referred to as the S cell C10B). In FIG. 1, the P cell C10A and the S cell C10B may be configured by different base stations 100, or may be configured by the same base station 100. Furthermore, the P cell C10A and the S cell C10B may completely overlap, partially overlap, or not overlap at all. The P cell C10A is an example of a first cell, and the S cell C10B is an example of a second cell. The base station 100A is an example of a first base station, and the base station 100B is an example of a second base station.

[0015] The base station 100 may be, for example, a small wireless base station (including a micro wireless base station, a femto wireless base station, etc.) such as a macro wireless base station or a pico wireless base station, or may be a wireless base station of various scales, and may be referred to as a wireless communication device, a communication device, a transmitting device, etc. The relay device 200 may be a communication device having various functions, such as a function of relaying signals, and may be referred to as a wireless communication device, a communication device, a receiving device, a repeater, etc. The terminal 200 may be a wireless terminal, such as various devices with wireless communication functions, such as a mobile phone, a smartphone, a PDA (Personal Digital Assistant), a personal computer, a vehicle, an airplane, a drone, etc., or devices (such as a sensor device) mounted on a robot, an AV device, a home appliance, an office machine, a vending machine, other household appliances, industrial equipment, etc., and may be referred to as a wireless communication device, a communication device, a receiving device, a mobile station, etc.

[0016] The base station 100 is connected to a network device (a higher-level device or another base station) not shown in the figure via a wired connection. Note that the base station 100 may be connected to the network device wirelessly instead of via a wired connection.

[0017] The base station 100 may have a wireless communication function with the terminal 200 and a digital signal processing and control function separated into separate devices. In this case, the device having the wireless communication function may be called an RRH (Remote Radio Head), and the device having the digital signal processing and control function may be called a BBU (Base Band Unit). The RRH may be installed extending from the BBU, and they may be connected by a wired connection such as optical fiber. Alternatively, they may be connected wirelessly. Instead of the aforementioned RRH and BBU, the base station 100 may be separated into, for example, a Central Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU). The DU may include, for example, a MAC (Media Access Control) layer function. The DU may also include, for example, a function of an RLC (Radio Link Control) layer. The RU includes at least an RF wireless circuit. The DU and RU may also be integrated into one unit.

[0018] On the other hand, the terminal 200 communicates with the base station 100 via wireless communication.

[0019] Next, the base station 100 will be described. Fig. 2 is a diagram showing an example of a functional configuration diagram of the base station 100. The base station 100 has a wireless communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.

[0020] The wireless communication unit 110 is composed of a transmitting unit 111 and a receiving unit 112, and performs wireless communication with the terminal 200. Specifically, the transmitting unit 111 transmits to the terminal 200 downlink signals such as measurement signals (e.g., SSB, reference signals) that the terminal is to measure, random access procedure signals, RRC layer signals, downlink data signals, and downlink control signals.

[0021] The receiving unit 112 can receive uplink signals transmitted from the terminal 200, such as signals of a random access procedure, signals of an RRC layer, uplink data signals, and uplink control signals.

[0022] The control unit 120 controls the base station 100. Specifically, the control unit 120 can control the establishment of an RRC connection with the terminal 200, signal processing of signals received by the receiving unit 112, creation of transmission blocks (TBs), mapping of the transmission blocks to radio resources, etc. The control unit 120 can also control on-demand SSB.

[0023] The storage unit 130 can store, for example, downstream data signals.

[0024] The communication unit 140 connects to a network device (e.g., a higher-level device or another base station device) via a wired or wireless connection to communicate with the device. Data signals received by the communication unit 140 and directed to the terminal 200 can be stored in the storage unit 130. The wireless communication unit 110 and the communication unit 140 may be collectively referred to as the communication unit.

[0025] Next, the terminal 200 will be described. Fig. 3 is a diagram showing an example of a functional configuration diagram of the terminal 200. As shown in Fig. 3, the terminal 200 includes a communication unit 210, a control unit 220, and a storage unit 230. These components are connected to each other so as to enable unidirectional or bidirectional input and output of signals and data. The communication unit 210 can be described as being divided into a transmission unit 211 and a reception unit 212.

[0026] The transmitter 211 transmits data signals and control signals by wireless communication via an antenna. Note that the antenna may be common for both transmission and reception. The transmitter 211 transmits uplink signals such as random access procedure signals, RRC layer signals, uplink data signals, and uplink control signals, for example.

[0027] The receiver 212 receives downlink signals, such as a random access procedure signal, a downlink data signal, and a downlink control signal, transmitted from the base station 100. The received signals may also include reference signals used for channel estimation and demodulation. The receiver 212 can also receive measurement signals transmitted from the base station 100 and measure the signals.

[0028] The control unit 220 controls the terminal 200. Specifically, the control unit 220 can perform control of establishing an RRC connection with the base station 100, signal processing of signals received by the receiving unit 212, creating transmission blocks (TBs), mapping the transmission blocks to radio resources, etc. The control unit 220 can also perform control related to measurement of measurement signals in the receiving unit 212.

[0029] The storage unit 230 can store, for example, uplink data signals, and can also store configuration information (or setting information) related to wireless communication transmitted from the base station 100.

[0030] Next, an example of processing by the base station 100A in the first embodiment will be described with reference to Fig. 4. Fig. 4 is a diagram showing an example of an operation flow of the base station.

[0031] The transmitter 111 of the base station 100A transmits a first signal to the terminal 200, the first signal including first information regarding measurement of a third signal to be transmitted within the SCell C10B and / or second information regarding the SCell C10B (step S10). The first information regarding measurement of the third signal includes, for example, at least one of information regarding enabling or disabling measurement, information regarding conditions for performing measurement, information regarding the interval for measuring the third signal, information regarding the period for measuring the third signal, information regarding the number of measurements for measuring the third signal, information regarding a method for transmitting measurement results of the third signal, information regarding the period for transmitting measurement results of the third signal, and information regarding the number of times the measurement results of the third signal are transmitted. The information regarding enabling or disabling measurement indicates whether the terminal 200 performs measurement upon receiving the first signal. For example, when indicating disabling of measurement, the terminal 200 does not perform measurement of the third signal upon receiving the first signal and does not transmit the measurement results. When indicating enabling of measurement, the terminal 200 performs measurement of the third signal upon receiving the first signal and transmits the measurement results. The information on the condition for performing measurement or transmitting the measurement result indicates the condition for terminal 200 to perform measurement of the third signal or transmit the measurement result of the third signal. For example, terminal 200 performs measurement and transmits the measurement result when terminal 200 receives a fourth signal.

[0032] The second information regarding the S cell C10B includes at least one of information on an S cell list of the terminal 200 including the S cell C10B and information on transmission settings of a third signal to be transmitted within the S cell C10B. The information on the transmission settings of the third signal to be transmitted within the S cell C10B includes at least one of radio resources for transmitting the third signal, subcarrier spacing, beam information, information on the transmission interval of the third signal, information on the transmission period of the third signal, information on the number of times the third signal is transmitted, and information on the transmission timing of the third signal.

[0033] After transmitting the first signal, the control unit 120 of the base station 100A performs a first process (step S20). The first process is, for example, a process of determining whether to have the terminal 200 measure a third signal transmitted into the S cell C10B. The control unit 120 of the base station 100A may determine whether to enable or disable the S cell C10B before determining whether to have the terminal 200 measure the third signal. The control unit 120 of the base station 100A may also determine whether to enable or disable the S cell C10B based on the measurement result of the third signal received from the terminal 200. If the control unit 120 of the base station 100A determines not to have the terminal 200 measure the third signal transmitted into the S cell C10B (No in step S20), the process ends. Note that step S20 may also be referred to as the first process.

[0034] When the control unit 120 of the base station 100A determines that the terminal 200 should measure the third signal transmitted within the SCell C10B (Yes in step S20), the transmission unit 111 of the base station 100A transmits a second signal to the terminal 200 and / or the base station 100B (step S30), and ends the processing. The second signal is an example of a signal that triggers the transmission of the third signal. The second signal may also be referred to as a signal for notifying the terminal 200 of the transmission of the third signal. The second signal is also an example of a signal that triggers the measurement of the third signal. The second signal may also be referred to as a signal for causing the terminal 200 to measure the third signal or a signal for causing the terminal 200 to process the third signal. The second signal may be the same as the first signal and may be an RRC layer signal. The second signal may be different from the first signal and may be a MAC layer signal or a downlink control signal. Details will be described later.

[0035] For example, when terminal 200 receives the second signal, terminal 200 measures a third signal transmitted from base station 100B in accordance with the first information and / or the second information. Furthermore, for example, when base station 100B receives the second signal, base station 100B controls to transmit the third signal. For example, terminal 200 periodically measures the third signal transmitted from base station 100B, and when the measured value is equal to or greater than a predetermined value, it stores the measurement result. For example, the third signal is a synchronization signal block (SSB).

[0036] As described above, in the first embodiment, the base station 100A transmits the second signal to at least one of the terminal 200 and the base station 100B, thereby enabling the terminal 200 to measure the third signal transmitted from the base station 100B. In other words, on-demand SSB can be implemented under the control of the base station 100A. Embodiment 2

[0037] In the first embodiment, an example has been described in which the base station 100A transmits a second signal to at least one of the terminal 200 and the base station 100B, and the terminal 200 measures a third signal transmitted from the base station 100B. In the second embodiment, a specific process for transmitting the second signal to the terminal 200 will be described. Note that in the second embodiment, the wireless communication system, the base station, the relay device, and the terminal are the same as those in the first embodiment, and therefore description thereof will be omitted.

[0038] The flow of processing in the second embodiment will be described with reference to Fig. 5. Fig. 5 is a diagram showing an example of a sequence of a communication system in the second embodiment. In Fig. 5, the same processing as in Fig. 4 is assigned the same step number.

[0039] The transmitter 111 of the base station 100A transmits a first signal including first information to the terminal 200 (step S10). The receiver 212 of the terminal 200 receives the first signal (step S10).

[0040] The control unit 120 of the base station 100A performs a first process including a process of determining to cause the terminal 200 to measure a third signal transmitted into the SCell C10B (step S20).

[0041] The transmitter 111 of the base station 100A transmits a second signal including third information instructing the terminal 200 to measure a third signal transmitted within the SCell C10B (step S30A). The receiver 212 of the terminal 200 receives the second signal (step S30A). Note that step S30A corresponds to step S30 in FIG. 4.

[0042] The transmitter 111 of the base station 100B transmits a third signal (step S40). The receiver 212 of the terminal 200 receives the third signal (step S40). Then, the controller 220 of the terminal 200 performs a second process and / or a third process (step S50). The second process is, for example, a process for controlling measurement of the third signal. Therefore, steps S40 and S50 may be performed simultaneously. The second process and / or the third process include a process for determining whether or not to perform the processes of steps S60 and S70 as subsequent processes. Details will be described later.

[0043] If the control unit 220 of the terminal 200 determines to transmit the measurement information in the second process, the transmission unit 211 of the terminal 200 transmits a fourth signal including the measurement information according to the measurement of the third signal to the base station 100A (step S60). Also, the reception unit 112 of the base station 100A receives the fourth signal (step S60).

[0044] When the control unit 220 of the terminal 200 determines in the second processing to perform communication via the S cell C10B (in other words, for example, when the S cell C10B is activated by the second signal), the control unit 220 of the terminal 200 executes processing for performing communication via the S cell C10B (step S70). Specifically, the control unit 220 of the terminal 200 measures a third signal transmitted from the base station 100B, and performs synchronization processing and automatic gain control (AGC) adjustment between the terminal 200 and the base station 100B. Similarly, the base station 100B performs synchronization processing and automatic gain control (AGC) adjustment between the terminal 200 and the base station 100B. The processing of step S70 may be collectively referred to as a third processing.

[0045] Here, the processing performed by terminal 200 after receiving the third signal will be described with reference to Fig. 6. Fig. 6 is a diagram showing an example of a control flow in terminal 200.

[0046] The receiving unit 212 of the terminal 200 receives the second signal (step S30). The control unit 220 of the terminal 200 determines whether the SCell C10B is activated (step S31).

[0047] If the SCell C10B is enabled (step S31: Yes), the control unit 220 of the terminal 200 performs a third process, which is a process for performing communication via the SCell C10B (step S50A), and ends the process. The third signal is, for example, a synchronization signal block (SSB). The third process may include the second process. The third process may also include step S70 of FIG. 5.

[0048] If the SCell C10B is not activated (step S31: No), the control unit 220 of the terminal 200 performs the second process (step S50B) and ends the process. After the second process, as shown in FIG. 5, the transmission unit 211 of the terminal 200 transmits a fourth signal including measurement information (step S60). The second process may include step S60 of FIG. 5.

[0049] While FIG. 6 illustrates an example in which the terminal 200 determines whether to perform the third process or the second process depending on whether the S cell C10B is activated, each process may be determined separately. For example, after determining whether to perform the third process depending on whether the S cell C10B is activated, the terminal 200 may determine whether to perform the second process depending on the state of the terminal 200, an instruction from the base station 100A, or the like. If the second process is performed, the control unit 220 of the terminal 200 may determine whether to transmit a fourth signal. The instruction from the base station 100A may be, for example, the first signal, the second signal, or a signal different from the first signal and the third signal. If the terminal 200 does not transmit measurement information, the terminal 200 may store the measurement results in the storage unit 230 and transmit the measurement results when it receives a signal requesting the measurement results from the base station 100A.

[0050] Next, the measurement of the third signal performed by terminal 200 will be described with reference to Fig. 7. Note that the parameters described in Fig. 7 are transmitted, for example, by being included in the first information and / or the second information. Fig. 7 is a diagram showing an example of measurement control by terminal 200 according to the information included in the first signal.

[0051] 7A shows an example in which the first information includes the measurement period of the third signal, or the second information includes information (P) about the period of the third signal. Assume that the third signal is transmitted from the base station 100B with a period (P). The first information may include a time offset within the period, radio resource information of the third signal, subcarrier spacing, and beam information. The time offset within the period may be, for example, a slot offset or a symbol offset.

[0052] The terminal 200 does not measure the third signal at the measurement timing of the third signal according to the information (P) about the period before receiving the second signal. Then, after receiving the second signal, the terminal 200 measures the third signal at the measurement timing according to the information (P) about the period before receiving the second signal. Note that the measurement of the third signal is performed, for example, until the SCell C10B is disabled.

[0053] 7(B) is an example in which the first information includes information on the measurement period of the third signal, or the second information includes information on the period (P) of the third signal and information on the measurement duration or transmission duration (Duration). Note that, as in FIG. 7(A), it is assumed that the third signal is transmitted from the base station 100B with a period (P). Note that the first information and / or the second information may include radio resource information, subcarrier spacing, and beam information of the third signal.

[0054] Terminal 200 does not measure the third signal at the measurement timing of the third signal corresponding to information (P) regarding the period before receiving the second signal. Then, after receiving the second signal, terminal 200 measures the third signal at the measurement timing corresponding to information (P) regarding the period before receiving the second signal. Furthermore, measurement of the third signal is performed only during the period corresponding to information regarding the measurement period or transmission period. In other words, once the period corresponding to information regarding the measurement period or transmission period has elapsed, control unit 220 of terminal 200 stops measuring the third signal. Note that information regarding the measurement period or transmission period is, for example, the number of frames, the number of subframes, or the number of slots. Furthermore, information regarding the measurement period or transmission period may be, for example, an integer multiple of information (P) regarding the period. Furthermore, although in FIG. 7(B) the measurement period or transmission period starts when the third signal is received, it may start, for example, from the time when the second signal is received.

[0055] FIG. 7(C) shows an example in which the first information includes information on the measurement period or transmission period (Duration), information on the offset (Time offset), and information on the time gap (Time gap). As in FIGS. 7(A) and 7(B), it is assumed that the third signal is transmitted from the base station 100B at a period (P). Note that the time gap information is used, for example, when measuring multiple third signals, and therefore may not be included when measuring only one SSB. Furthermore, the first information and / or the second information may include reference timing information. Note that the reference timing may be specified, for example, in a standard. For example, the standard may specify that the reference timing is the reception timing of the second signal. In this way, it is possible to avoid including reference timing information. Note that the first information and / or the second information may include radio resource information, subcarrier spacing, and beam information of the third signal.

[0056] Terminal 200 does not measure the third signal until it receives the second signal. Then, after receiving the second signal, terminal 200 measures the third signal at a timing when a length corresponding to the information related to the offset has elapsed from the reference timing. Furthermore, when measuring multiple third signals, terminal 200 measures the third signal at a timing when a time corresponding to the information related to the time gap has elapsed after measuring the third signal. Note that terminal 200 measures the multiple third signals during the measurement period or transmission period (Duration). Note that if the measurement period in the first information or the second information does not include information related to the transmission period (Duration), terminal 200 ends measurement of the third signal when it measures the last signal of the multiple third signals.

[0057] Next, the third information included in the second signal will be described with reference to Figures 8 and 9. Figure 8 is a diagram showing a first example of information included in the second signal. Figure 9 is a diagram showing a second example of information included in the second signal. The third information may also be included in the first signal.

[0058] 8 shows an example in which the third information is a media access control element (MAC CE). When the third information is a MAC CE, the second signal may be referred to as a MAC layer signal.

[0059] FIG. 8A is a diagram showing a first example of a MAC CE. In FIG. 8A, Ｘ (X is 0 to 7) S cell C included in the S cell list Ｘ For example, C ０ corresponds to S cell C10B, then C ０ When 1 is input to C10B, it indicates the validation of S cell C10B. ０ When 0 is input to C, it instructs to invalidate the S cell C10B. Ｘ is a measurement object C included in the measurement object list. Ｘ In addition, in FIG. Ｙ (Y is 0 to 7) Ｙ or measurement object S included in the measurement object list Ｙ In the first example, it is possible to issue instructions to a plurality of S cells simultaneously.

[0060] When the terminal 200 receives the first example of the MAC CE as the third information, the terminal 200 Ｘ In addition, the terminal 200 activates S Ｙ The corresponding S cell S Ｙ Processing the third signal may include, for example, performing the second processing or / and the third processing.

[0061] FIG. 8B is a diagram showing a second example of MAC CE. In FIG. 8B, Ｘ (X is 0 to 7) is the same as in the first example. Ｙ (Y is 0 to 3) S cell S included in the S cell list corresponding Ｙ or measurement object S ＹFor example, in the first signal, C Ｘ and S Ｙ For example, C ０ S cells corresponding to ０ It is possible to link the S cell corresponding to the C ２ S cells corresponding to １ By doing this, you can link the S cell corresponding to Ｙ In FIG. 8B, R indicates a reserved bit.

[0062] When the terminal 200 receives the second example of the MAC CE as the third information, the terminal 200 receives the C Ｘ The terminal 200 also activates the S cell. Ｙ The third signal is shown to be transmitted at Ｙ Cell or measurement object S Ｙ Processing the third signal may include, for example, performing the second processing or / and the third processing.

[0063] FIG. 8C is a diagram showing a third example of MAC CE. Ｘ (X is 0 to 7) is the same as in the first example. Also, in FIG. 8(C), information indicating a transmit beam (Transmit beam indication) is included. Note that FIG. 8(C) shows an example in which there are N pieces of information indicating a transmit beam (N is an integer). Note that the correspondence between the information indicating a transmit beam, the beam, and the S cell or measurement object is set, for example, by the first signal.

[0064] When the terminal 200 receives the third example of the MAC CE as the third information, the terminal 200 receives the C Ｘ The terminal 200 also processes a third signal transmitted on a beam indicated by the information indicating the transmission beam. Processing the third signal includes, for example, performing the second process and / or the third process.

[0065] FIG. 8D is a diagram showing a fourth example of MAC CE. In FIG. 8D, Ｘ (X is 0 to 7) is the same as in the first example. Note that Fig. 8(D) is an example in which the third signal is SSB. Also, Fig. 8(D) includes an SSB configuration identifier (SSB configuration ID). Note that Fig. 8(D) shows an example in which there are N SSB configuration identifiers (N is an integer). Note that the relationship between the SSB configuration identifiers and the S cell or measurement object is set, for example, by the first signal.

[0066] When the terminal 200 receives the fourth example of the MAC CE as the third information, the terminal 200 receives the C Ｘ The terminal 200 also processes an SSB (third signal) for the S-cell or the measurement object indicated by the SSB configuration identifier. Processing the third signal may include, for example, performing the second process or / and the third process.

[0067] FIG. 8E is a diagram showing a fifth example of MAC CE. In FIG. 8E, Ｘ (X is 0 to 7) and S Ｙ (Y is 0 to 7) is the same as in the first example. Note that FIG. 8(E) includes N CSI-RS IDs (N is an integer). The CSI-RS IDs are the SCell C corresponding to the CSI-RS IDs. Ｘ Or, it indicates whether or not CSI-RS for the measurement object is transmitted.

[0068] When the terminal 200 receives the fifth example of the MAC CE as the third information, the terminal 200 detects the SCell C Ｘ In addition, the terminal 200 activates S Ｙ The corresponding S cell S Ｙ The terminal 200 controls the processing of the third signal. Furthermore, the terminal 200 measures the CSI-RS whose transmission is indicated by the CSI-RSSID. Note that the CSI-RS may indicate whether the CSI-RS is transmitted or measured after transmitting the third signal.

[0069] Next, an example in which the third information is included in the information included in the downlink control information will be described. FIG. 9 shows an example in which the third information is included in downlink control information (DCI: Downlink Control Information). Note that, when the third information is included in the downlink control information, the second signal may be described as PDCCH. Also, if it is not configured to measure the third signal, the third information may be 0 bits. Note that FIGS. 9(A), 9(B), and 9(C) show examples in which the third information is composed of multiple information blocks (Information Block 1-N), at least one of which includes the third information. Note that FIGS. 9(A), 9(B), and 9(C) show examples in which the third information is included in information block 1 (Information Block 1). However, the third information included in information block 1 may be included in another information block.

[0070] 9A shows a first example in which the third information is information included in the downlink control information. In FIG. 9A, the third information includes a bit field (one or more bits) indicating the state of the S cell and a bit field (one or more bits) indicating whether or not the third signal is transmitted. Note that each bit field in FIG. 9A may be set according to the number of S cells to be set in the terminal 200, or may have a predetermined number of bits.

[0071] When the terminal 200 receives the third information shown in Fig. 9(A), it activates the S cell indicated as being activated, according to the value of the bit field indicating the state of the S cell. Furthermore, the terminal 200 controls to process the third signal of the corresponding S cell, which is indicated by the bit field indicating whether the third signal is to be transmitted. Processing the third signal involves, for example, performing the second process and / or the third process.

[0072] Figure 9(B) shows a second example in which the third information is information included in the downlink control information. Figure 9(B) includes, as the third information, a bit field (one or more bits) indicating the state of the S cell and a bit field (multiple bits) indicating the configuration identifier (SSB configuration ID) of the transmission beam of the third signal or the SSB (third signal). The bit field (one or more bits) indicating the state of the S cell is the same as in Figure 9(A).

[0073] When the terminal 200 receives the third information shown in FIG. 9(B), it activates the S cell indicated as activated, according to the value of the bit field indicating the state of the S cell. Furthermore, the terminal 200 processes the SSB (third signal) indicated by the measurement or SSB configuration identifier of the third signal transmitted on the beam indicated by the information indicating the transmission beam, according to the bit field indicating the configuration identifier (SSB configuration ID) of the transmission beam or SSB (third signal) of the third signal. Processing the third signal involves, for example, performing the second processing and / or the third processing.

[0074] Figure 9 (C) shows a third example in which the third information is information included in the downlink control information. In Figure 9 (C), in addition to the content described in Figure 9 (A), the third information includes a bit field (one or more bits) indicating whether or not CSI-RS is transmitted. Note that each bit field in Figure 9 (C) may be set, for example, according to the number of S cells set in terminal 200, or may be a predetermined number of bits.

[0075] When the terminal 200 receives the third information shown in FIG. 9(C), it activates the S cell indicated as activated according to the value of the bit field indicating the state of the S cell. Furthermore, the terminal 200 controls to process the third signal of the corresponding S cell, which is indicated in the bit field indicating whether the third signal is transmitted. The third signal is processed, for example, by performing the second processing or / and the third processing. Furthermore, the terminal 200 measures the CSI-RS according to the bit field indicating whether to measure the CSI-RS. Note that the CSI-RS may indicate whether the CSI-RS is transmitted or measured after transmitting the third signal.

[0076] As described above, in the second embodiment, the base station 100A transmits a second signal to the terminal 200, thereby controlling the terminal 200 to measure the third signal. Then, the terminal 200 controls the terminal 200 to measure the third signal according to the third information included in the second signal. In this way, the terminal 200 can measure the third signal (e.g., SSB) transmitted from the S cell C10B. In other words, the terminal 200 can measure on-demand SSB for the S cell C10B. Furthermore, since the terminal 200 does not need to periodically measure the third signal via the S cell C10B, the power consumption of the terminal 200 can be reduced. Embodiment 3

[0077] In the first embodiment, an example has been described in which the base station 100A transmits a second signal to at least one of the terminal 200 and the base station 100B, thereby causing the terminal 200 to measure a third signal transmitted from the base station 100B. In the second embodiment, a specific process when the base station 100A transmits the second signal to the terminal 200 has been described. In the third embodiment, a specific process when the base station 100A transmits the second signal to the base station 100B will be described. Note that in the third embodiment, the wireless communication system, the base station, the relay device, and the terminal are the same as those in the first and second embodiments, and therefore description thereof will be omitted.

[0078] The flow of processing in the third embodiment will be described with reference to Fig. 10. Fig. 10 is a diagram showing an example of a sequence of a communication system in the third embodiment. In Fig. 10, the same processing as in Figs. 4 and 5 is given the same step number.

[0079] The control unit 120 of the base station 100A performs a first process including a process of determining to cause the terminal 200 to measure a third signal transmitted into the SCell C10B (step S20).

[0080] The communication unit 140 of the base station 100A transmits a second signal including fourth information instructing the base station 100B to transmit a third signal (step S30B). The communication unit 140 of the base station 100B receives the second signal (step S30B). Note that step S30B corresponds to step S30 in FIG. 4.

[0081] The transmitter 111 of the base station 100B transmits a third signal in response to the fourth information (step S40). The receiver 212 of the terminal 200 receives the third signal (step S40). Then, the controller 220 of the terminal 200 performs a second process (step S50). The third signal is, for example, a synchronization signals block (SSB).

[0082] In the third embodiment, the terminal 200 measures the third signal in accordance with a measurement configuration for measuring the third signal included in the first signal. In this manner, the base station 100A can control the terminal 200 to measure the third signal by transmitting a second signal that triggers transmission of the third signal to the base station 100B.

[0083] As described above, in the third embodiment, the base station 100A transmits a second signal to the base station 100B, thereby controlling the base station 100B to transmit a third signal. Then, the base station 100B controls the base station 100B to transmit the third signal according to the fourth information included in the second signal. In this way, the terminal 200 can measure the third signal (e.g., SSB) transmitted from the S cell C10B. In other words, the terminal 200 can measure on-demand SSB for the S cell C10B. Furthermore, since the base station 100B does not need to periodically transmit the third signal via the S cell C10B, the power consumption of the base station 100B can be reduced. Embodiment 4

[0084] In the first embodiment, an example has been described in which the base station 100A transmits a second signal to at least one of the terminal 200 and the base station 100B, thereby causing the terminal 200 to measure a third signal transmitted from the base station 100B. In the second embodiment, a specific process when the base station 100A transmits the second signal to the terminal 200 has been described. In the third embodiment, a specific process when the base station 100A transmits the second signal to the base station 100B has been described. In the fourth embodiment, an example will be described in which the base station 100A transmits a second signal including third information to the terminal 200 and transmits a fifth signal including fourth information to the base station 100B. In the fourth embodiment, the wireless communication system, the base station, and the terminal are similar to those in the first to third embodiments, and therefore description thereof will be omitted.

[0085] The processing flow in the fourth embodiment will be described using Figure 11. Figure 11 is a diagram showing an example of a sequence of a communication system in the fourth embodiment. In Figure 11, the same processes as those in Figures 4, 5, and 10 are assigned the same step numbers. In Figure 11, the second signal transmitted in step S30B of Figure 10 is referred to as a fifth signal to distinguish it from the signal transmitted in step S30A.

[0086] The control unit 120 of the base station 100A performs a first process including a process of determining to cause the terminal 200 to measure a third signal transmitted into the SCell C10B (step S20).

[0087] The transmitter 111 of the base station 100A transmits a second signal including third information instructing the terminal 200 to measure a third signal transmitted within the SCell C10B (step S30A). The receiver 212 of the terminal 200 receives the second signal (step S30A). Note that step S30A corresponds to step S30 in FIG. 4.

[0088] The communication unit 140 of the base station 100A transmits a fifth signal including fourth information instructing the base station 100B to transmit a third signal (step S30B). The communication unit 140 of the base station 100B receives the fifth signal (step S30B). Note that step S30B corresponds to step S30 in FIG. 4.

[0089] The transmitting unit 111 of the base station 100B transmits a third signal in response to the fourth information (step S40). The terminal 200 receives the third signal in response to the third information (step S40) and performs the second process (step S50) and / or the third process (step S70). (Note that the third signal is, for example, a synchronization signals block (SSB).

[0090] As described above, in the fourth embodiment, the base station 100A controls the terminal 200 to measure the third signal by transmitting a second signal to the terminal 200. Furthermore, the base station 100A controls the base station 100B to transmit a third signal by transmitting a fifth signal to the base station 100B. In this manner, the terminal 200 can measure the third signal (e.g., SSB) transmitted from the S cell C10B. In other words, the terminal 200 can measure on-demand SSB for the S cell C10CB. Furthermore, since the terminal 200 does not need to periodically measure the third signal via the S cell C10B, the power consumption of the terminal 200 can be reduced. Furthermore, since the base station 100B does not need to periodically transmit the third signal via the S cell C10CB, the power consumption of the base station 100B can be reduced. Fifth embodiment

[0091] In the first embodiment, an example has been described in which the base station 100A transmits a second signal to at least one of the terminal 200 and the base station 100B, thereby causing the terminal 200 to measure a third signal transmitted from the base station 100B. In the second embodiment, a specific process when the base station 100A transmits the second signal to the terminal 200 has been described. In the third embodiment, a specific process when the base station 100A transmits the second signal to the base station 100B has been described. In the fourth embodiment, an example has been described in which the base station 100A transmits a second signal including third information to the terminal 200 and transmits a fifth signal including fourth information to the base station 100B. In the fifth embodiment, an example will be described in which the terminal 200 triggers measurement of the third signal. Note that in the fifth embodiment, the wireless communication system, the base station, and the terminal are similar to those in the first to fourth embodiments, and therefore description thereof will be omitted.

[0092] The processing flow in the fifth embodiment will be described with reference to Fig. 12. Fig. 12 is a diagram showing an example of a sequence of a communication system in the fifth embodiment. In Fig. 12, the same processes as those in Figs. 4, 5, 10, and 11 are assigned the same step numbers.

[0093] The transmitter 111 of the base station 100A transmits a first signal including the first information and / or the second information to the terminal 200 (step S10). The receiver 212 of the terminal 200 receives the first signal (step S10).

[0094] The transmitter 211 of the terminal 200 transmits a sixth signal to the base station 100A (step S15). The receiver 112 of the base station 100A receives the sixth signal (step S15). The sixth signal may include fifth information. The fifth information is information for triggering measurement of the third signal. The sixth signal is transmitted, for example, when a large amount of data traffic is occurring in the terminal 200, or when, for example, the SCell C10B is a network energy saving cell and there is a possibility that the third signal is not being transmitted. Resources corresponding to the sixth signal may be set by the first signal. The receiver 112 of the base station 100A may then perform the first process by receiving the sixth signal using the set resources. The sixth signal may be, for example, a random access procedure signal (message 1, message 3, message A), a scheduling request, a MAC-CE, or an RRC message.

[0095] The control unit 120 of the base station 100A performs a first process including a process of determining whether to have the terminal 200 measure a third signal transmitted into the S cell C10B (step S20). The control unit 120 of the base station 100A determines whether to have the terminal 200 measure the third signal transmitted into the S cell C10B. If it is determined that the terminal 200 should measure the third signal, the transmission unit 112 of the base station 100A transmits a second signal to the terminal 200 (step S30A), and the communication unit 140 of the base station 100A transmits a fifth signal including the fourth information to the base station 100B (step S30B). The second signal may include information indicating an ACK for the sixth signal instead of the third information. Furthermore, when the control unit 120 of the base station 100A determines not to have the terminal 200 measure the third signal transmitted into the S cell C10B in the first process, it may transmit a signal including a NACK in response to the sixth signal to the terminal 200. The second signal and the signal including a NACK are, for example, signals of a random access procedure (message 2, message 4, message B) and downlink control signals.

[0096] As described above, in the fifth embodiment, the terminal 200 transmits a sixth signal to the base station 100A, thereby controlling the base station 100A to execute the first process. Then, depending on the result of the first process, the base station 100A transmits a fifth signal to the base station 100B, thereby controlling the base station 100B to transmit a third signal. In this manner, the terminal 200 is able to measure the third signal (e.g., SSB) transmitted from the S cell C10B. In other words, the terminal 200 is able to measure on-demand SSB for the S cell C10B. Furthermore, since the terminal 200 does not need to periodically measure the third signal via the S cell C10B, the power consumption of the terminal 200 can be reduced. Furthermore, since the base station 100B does not need to periodically transmit the third signal via the S cell C10B, the power consumption of the base station 100B can be reduced. Hardware configuration of each device in each embodiment

[0097] The hardware configuration of each device in the wireless communication system of each embodiment will be described with reference to FIGS.

[0098] Fig. 13 is a diagram showing an example of the hardware configuration of base station 100. As shown in Fig. 13, base station 100 has, as hardware components, for example, an RF (Radio Frequency) circuit 320 equipped with an antenna 310, a CPU (Central Processing Unit) 330, a DSP (Digital Signal Processor) 340, a memory 350, and a network IF (Interface) 360. CPU 330 is connected via a bus so as to enable input and output of various signals and data signals. The memory 350 includes at least one of a RAM (Random Access Memory) such as an SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), and a flash memory, and stores programs, control information, and data signals.

[0099] The correspondence between the functional configuration of the base station 100 shown in Fig. 2 and the hardware configuration of the base station 100 shown in Fig. 13 will be described. The transmitter 111 and receiver 112 (or wireless communication unit 110) are realized by, for example, an RF circuit 320, or an antenna 310 and an RF circuit 320. The control unit 120 is realized by, for example, a CPU 330, a DSP 340, a memory 350, a digital electronic circuit (not shown), etc. Examples of the digital electronic circuit include an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), and an LSI (Large Scale Integration). The storage unit 130 is realized by, for example, the memory 350. The communication unit 140 is realized by, for example, the network IF 360 .

[0100] It should be noted that base station 100 may generate a plurality of data signals to be transmitted in a plurality of subbands, and the filters that generate these signals may be configured independently for each subband.

[0101] Fig. 14 is a diagram showing an example of the hardware configuration of terminal 200. As shown in Fig. 14, terminal 200 has, as hardware components, an RF circuit 420 including, for example, an antenna 410, a CPU 430, a DSP 440, and a memory 450. Memory 450 includes at least one of a RAM such as an SDRAM, a ROM, and a flash memory, and stores programs, control information, and data signals.

[0102] The correspondence between the functional configuration of the terminal 200 shown in Fig. 3 and the hardware configuration of the terminal 200 shown in Fig. 14 will be described. The transmitter 211 and receiver 212 (or communication unit 210) are realized by, for example, an RF circuit 420, or an antenna 410 and an RF circuit 420. The control unit 220 is realized by, for example, a CPU 430, a DSP 440, a memory 450, a digital electronic circuit (not shown), etc. Examples of the digital electronic circuit include an ASIC, an FPGA, and an LSI. The storage unit 230 is realized by, for example, the memory 450.

[0103] The embodiments may be combined as appropriate within a range that does not cause any contradiction.

[0104] In each embodiment, examples of a base station and a terminal are described, but the disclosed technology is not limited to this and can be applied to various devices, such as electronic devices mounted on automobiles, trains, airplanes, artificial satellites, etc., electronic devices transported by drones, etc., robots, AV equipment, home appliances, office equipment, vending machines, and other household equipment.

[0105] Furthermore, although the embodiments have been described using fifth-generation mobile communications as an example, the application of the disclosed technology is not limited to this. For example, the disclosed technology may be applied to mobile communications of different generations, such as sixth and seventh generations.

[0106] 1 Wireless communication system 100A 100B Base station C10A C10B Cell 110 Wireless communication unit 111 Transmitter 112 Receiver 120 Control unit 130 Memory unit 140 Communication unit 200 Terminal 210 Communication unit 211 Transmitter 212 Receiver 220 Control unit 230 Memory unit 310 Antenna 320 RF circuit 330 CPU 340 DSP 350 Memory 360 Network IF 410 Antenna 420 RF circuit 430 CPU 440 DSP 450 Memory

Claims

1. A base station that forms a first cell, comprising: a transmitting unit that can transmit to a terminal a first signal that includes first information regarding measurement of a third signal transmitted within a second cell different from the first cell and / or second information regarding the second cell; and a control unit that controls the transmission of a second signal to the terminal or another base station that transmits the third signal, so that the terminal can process the third signal.

2. The base station according to claim 1, wherein the transmitter transmits to the terminal the second signal including third information including information on whether the third signal is to be transmitted.

3. The base station according to claim 2, wherein the third information includes information on whether to enable the second cell, and the second signal is an RRC layer signal, a MAC layer signal, or a downlink control signal.

4. The base station of claim 1, wherein the first information includes at least one of information on enabling or disabling the measurement of the third signal, information on conditions for performing the measurement, information on the interval for measuring the third signal, information on the period for measuring the third signal, information on the number of times for measuring the third signal, information on a method for transmitting the measurement results of the third signal, information on the period for transmitting the measurement results of the third signal, and information on the number of times for transmitting the measurement results of the third signal; and the second information includes at least one of information on a cell list of the terminal including the second cell, and information on transmission settings for the third signal.

5. The base station according to claim 1, further comprising a receiver for receiving a fourth signal as a result of measurement of the third signal.

6. The base station according to claim 3, wherein the transmitting unit transmits a fifth signal instructing the other base station to transmit the third signal.

7. The base station device according to claim 6, further comprising a receiving unit that receives a sixth signal that triggers measurement of the third signal, and the control unit determines whether or not to transmit the third signal in response to the sixth signal.

8. A base station according to any one of claims 1 to 7, wherein the third signal is a synchronization signals block (SSB).

9. A terminal having: a receiving unit that receives a first signal including first information regarding measurement of a third signal transmitted from a first base station that forms a first cell into a second cell different from the first cell and / or second information regarding the second cell, and a second signal that instructs processing of the third signal; and a control unit that controls to measure the third signal in accordance with the second signal.

10. A wireless communication system comprising: a first base station forming a first cell; a second base station forming a second cell different from the first cell; and a terminal measuring a third signal transmitted within the second cell, wherein the first base station transmits to the terminal a first signal including first information regarding the measurement of the third signal and / or second information regarding the second cell, and controls the terminal or the second base station to transmit a second signal to cause the terminal to process the third signal.

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