Terminal and communication method

Abstract

This terminal comprises: a reception unit that receives information about a second band within a first band; and a control unit that uses both a signal in the first band and a signal in the second band, wherein the reception unit receives a signal, in the first band, related to time or frequency synchronization.

Description

[Technical Field]

[0001] The present invention relates to a terminal and a communication method in a wireless communication system. [Background technology]

[0002] The 3GPP (3rd Generation Partnership Project) is currently studying a wireless communication system called 5G or NR (New Radio) (hereinafter, this wireless communication system will be referred to as "NR") in order to achieve a larger system capacity, a higher data transmission speed, and a lower latency in wireless sections. In 5G, various wireless technologies and network architectures are being studied to meet the requirements of achieving a throughput of 10 Gbps or more while keeping the latency in wireless sections to 1 ms or less (for example, Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] 3GPP TS 38.213 V16.3.0 (2020-09) Summary of the Invention [Problem to be solved by the invention]

[0004] In future wireless communication systems (e.g., Rel. 17 and later), it is expected that terminals compatible with various use cases such as IoT will be introduced.

[0005] However, it is unclear how UEs with different capabilities / categories use resources. If resources are not used appropriately, there is a risk of system performance degradation, such as a decrease in resource utilization efficiency.

[0006] The present invention has been made in view of the above points, and has an object to provide a technique that enables resources to be used appropriately according to capabilities. [Means for solving the problem]

[0007] According to the disclosed technology, a signal processing device is provided which includes a receiving unit that receives information about a second band within a first band, and a control unit that uses both a signal within the first band and a signal within the second band for synchronization, the control unit assumes that the first band signal associated with time or frequency synchronization is a quasi co-located (QCL) source of the second band signal associated with time or frequency synchronization, and the receiving unit receives the first band signal associated with time or frequency synchronization more times than the second band signal associated with time or frequency synchronization; The control unit The aforementioned a signal in the first band for time or frequency synchronization; The aforementioned and the second band signal associated with time or frequency synchronization overlap in the time domain, The aforementioned a signal in the first band for time or frequency synchronization; The aforementioned A terminal is provided that performs time or frequency synchronization using both the second band signal and the second band signal related to time or frequency synchronization. [Effects of the Invention]

[0008] The disclosed technology provides a technology that enables resources to be used appropriately according to capabilities. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram for explaining a situation in which a plurality of types of terminals are mixed. [Figure 3] FIG. 10 is a diagram illustrating a baseline channel and an additional channel. [Figure 4] FIG. 4 is a sequence diagram illustrating an example of the flow of a time / frequency synchronization process according to the first embodiment. [Figure 5] FIG. 2 is a diagram for explaining a time / frequency synchronization process according to the first embodiment. [Figure 6]FIG. 10 is a sequence diagram illustrating an example of the flow of a time / frequency synchronization process according to the second embodiment. [Figure 7] FIG. 10 is a diagram illustrating a time / frequency synchronization process according to the second embodiment. [Figure 8] FIG. 10 is a diagram illustrating a time / frequency synchronization process according to a third embodiment. [Figure 9] 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. [Figure 10] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to the embodiment of the present invention. [Figure 11] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0012] In operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate, such as existing NR, but is not limited to existing NR.

[0013] Furthermore, this specification uses terms used in existing NR or LTE specifications, such as PDCCH, RRC, MAC, and DCI, but the channel names, protocol names, signal names, function names, etc. used in this specification may be called by other names.

[0014] (System Configuration) FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, a wireless communication system according to an embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0015] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot, or a TTI may be a subframe.

[0016] Base station 10 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (component carriers)) to communicate with terminal 20. In carrier aggregation, one primary cell (PCell) and one or more secondary cells (SCells) are used.

[0017] The base station 10 transmits a synchronization signal, system information, and the like to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The synchronization signal may also be SSB. The system information is transmitted, for example, on an NR-PBCH (Physical Broadcast Channel) or a PDSCH (Physical Downlink Shared Channel), and is also referred to as broadcast information. As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 on a DL (Downlink), and receives control signals or data from the terminal 20 on an UL (Uplink). Note that, here, signals transmitted on control channels such as a PUCCH (Physical Uplink Control Channel) and a PDCCH (Physical Downlink Control Channel) are referred to as control signals, and signals transmitted on shared channels such as a PUSCH and a PDSCH are referred to as data, but these terms are merely examples.

[0018] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 may be referred to as a UE, and the base station 10 may be referred to as a gNB.

[0019] (Problems with the prior art) Next, we will explain the problems with the conventional technology. Future wireless communication systems / networks (e.g., 6G) are expected to support a wider variety of use cases / terminals than 5G, NR, etc. in order to further improve communication speed, capacity, reliability, latency performance, and multiple connections, and also to expand into new areas such as sensing.

[0020] In LTE and NR, functions that have been reduced from the mandatory functions supported by existing terminals are defined as UE categories / capabilities for the Internet of Things (IoT). Examples of such UE categories / capabilities include enhanced machine type communication (eMTC) in LTE, narrow band IoT (NB) in LTE, and reduced capability (RedCap) in NR. Therefore, additional functions are considered necessary to compensate for the performance degradation caused by the reduced functionality.

[0021] Fig. 2 is a diagram for explaining a situation where multiple types of terminals coexist. As shown in Fig. 2, there are cases where existing UEs that communicate in a wide band and for a short time, IoT UEs that use a narrower band, a longer time, and repetition, and sensing UEs that use a narrower band and smaller information, coexist.

[0022] In this way, if functions are added for each use case / terminal in future wireless communication systems, it may become difficult to efficiently coexist with existing UEs.

[0023] (Outline of this embodiment) Therefore, in order to address such problems of the conventional technology, this embodiment describes a communication method that uses both a baseline channel (first band) that can be received by any UE and an additional channel (second band) optimized for a specific UE / service. By using both the baseline channel and the additional channel, it becomes possible, for example, to maintain a connection using the baseline channel while using the additional channel for communication with additionally required resources.

[0024] 3 is a diagram illustrating the baseline channel and the additional channel. Terminal 20 uses both the signal in the baseline channel and the signal in the additional channel. For example, as shown in FIG. 3, terminal 20 may perform at least one of the following on the baseline channel: receiving an SSB (a block including a synchronization signal), transmitting a Random Access Channel (RACH), receiving Msg2, transmitting Msg3, receiving Msg4, receiving a subsequent PDCCH, and transmitting a PUSCH / receiving a PDSCH scheduled by the PDCCH. Terminal 20 may also perform at least one of the following on the additional channel: receiving an SSB, transmitting a RACH, receiving a subsequent PDCCH, and transmitting a PUSCH / receiving a PDSCH scheduled by the PDCCH.

[0025] Incidentally, when the baseline channel and the additional channel are used in combination, it is necessary to consider a specific method for achieving time or frequency synchronization between the base station 10 and the terminal 20.

[0026] Hereinafter, examples 1, 2 and 3 will be described as specific examples of time or frequency synchronization according to the present embodiment.

[0027] Example 1 In this embodiment, an example is shown in which the terminal 20 receives a reference signal of a baseline channel related to time or frequency synchronization.

[0028] 4 is a sequence diagram illustrating an example of the flow of time / frequency synchronization processing according to Example 1. When starting communication with the terminal 20, the base station 10 transmits a baseline-synchronization signal (B-SS) of a baseline channel to the terminal 20 (step S11).

[0029] Next, the base station 10 transmits a baseline channel reference signal (B-CRS; baseline-cell-specific reference signal, B-TRS; baseline-tracking reference signal, etc.) related to time / frequency synchronization (step S12).

[0030] Next, the base station 10 transmits a control / data signal of the baseline channel (step S13), transmits a control / data signal of the additional channel (step S14), etc., based on the reference signal of the baseline channel related to time / frequency synchronization.

[0031] 5 is a diagram illustrating the time / frequency synchronization process according to the first embodiment. As shown in FIG. 5, the base station 10 and the terminal 20 may achieve time or frequency synchronization using only the signal of the baseline channel.

[0032] The transmission resources of the baseline channel reference signal related to time or frequency synchronization may be specified in the specifications, may be set in a broadcast signal or a higher layer signal transmitted on the baseline channel or additional channel, or may be notified in DCI transmitted on the baseline channel or additional channel.

[0033] In addition, the base station 10 may transmit the baseline channel reference signal related to time or frequency synchronization periodically, may semi-permanently activate or deactivate it, or may transmit it aperiodically.

[0034] Furthermore, the baseline channel reference signal related to time or frequency synchronization may be in a quasi-colocated (QCL) relationship with another signal or channel transmitted on the baseline channel or additional channel.

[0035] Which signals are in a QCL relationship may be specified in the specifications, may be set in a broadcast signal or a higher layer signal transmitted on the baseline channel or additional channel, or may be notified in DCI transmitted on the baseline channel or additional channel.

[0036] For example, the baseline channel synchronization signal (B-SS) or additional channel synchronization signal (A-SS) may be used as the QCL source for the baseline channel reference signal for time or frequency synchronization.

[0037] In addition, the reference signal of the baseline channel related to time or frequency synchronization may be a QCL source such as the downlink control channel of the baseline channel (B-PDCCH), the downlink shared channel of the baseline channel (B-PDSCH), the reference signal of the additional channel (A-CRS; additional-Cell-specific Reference Signal, A-TRS; additional-Tracking Reference Signal, etc.), the downlink control channel of the additional channel (A-PDCCH), the downlink shared channel of the additional channel (A-PDSCH), etc.

[0038] The baseline channel reference signal related to time or frequency synchronization may be receivable by terminals 20 of any type or terminal capability, and may not be receivable by some terminals 20 specified by the specifications.

[0039] The terminal 20 may assume that it receives the baseline channel reference signal for time or frequency synchronization multiple times, which allows time or frequency synchronization to be achieved even if the baseline channel bandwidth is small.

[0040] Example 2 In this embodiment, an example is shown in which the terminal 20 receives a reference signal of an additional channel related to time or frequency synchronization.

[0041] When the terminal 20 receives a notification indicating the setting related to the reference signal of the additional channel related to time or frequency synchronization, the terminal 20 may receive the reference signal of the additional channel related to time or frequency synchronization.

[0042] When the terminal 20 receives a notification indicating the presence of a reference signal of an additional channel related to time or frequency synchronization, the terminal 20 may receive the reference signal of the additional channel related to time or frequency synchronization. In this case, the setting related to the reference signal of the additional channel related to time or frequency synchronization may be defined in the specifications.

[0043] Furthermore, when the terminal 20 receives a notification indicating the absence of a reference signal of an additional channel related to time or frequency synchronization, the terminal 20 may not receive a reference signal of an additional channel related to time or frequency synchronization, and when the terminal 20 does not receive a notification indicating the absence of a reference signal of an additional channel related to time or frequency synchronization, the terminal 20 may receive a reference signal of an additional channel related to time or frequency synchronization. The behavior of the terminal 20 in this case may be defined in the specifications.

[0044] Furthermore, when terminal 20 does not receive a notification indicating the presence or absence of a reference signal of an additional channel related to time or frequency synchronization, terminal 20 may receive a reference signal of an additional channel related to time or frequency synchronization, or may not receive a reference signal of an additional channel related to time or frequency synchronization. The behavior of terminal 20 in this case may be defined in the specifications.

[0045] 6 is a sequence diagram illustrating an example of the flow of time / frequency synchronization processing according to Example 2. When starting communication with the terminal 20, the base station 10 transmits a synchronization signal of an additional channel to the terminal 20 (step S21).

[0046] Subsequently, the base station 10 transmits a reference signal of an additional channel related to time / frequency synchronization (step S22).

[0047] Next, the base station 10 transmits a control / data signal of the baseline channel (step S23), a control / data signal of the additional channel (step S24), etc., based on the reference signal of the additional channel related to time / frequency synchronization.

[0048] Fig. 7 is a diagram illustrating the time / frequency synchronization process according to the second embodiment. As shown in Fig. 7, the base station 10 and the terminal 20 may achieve time or frequency synchronization only by using the signal of the additional channel.

[0049] The transmission resources for the reference signals of the additional channels related to time or frequency synchronization may be specified in the specifications, may be set in a broadcast signal or a higher layer signal transmitted on the baseline channel or additional channel, or may be notified in DCI transmitted on the baseline channel or additional channel.

[0050] Furthermore, the base station 10 may periodically transmit the reference signal of the additional channel related to time or frequency synchronization, may semi-permanently activate or deactivate it, or may transmit it aperiodically.

[0051] Furthermore, the reference signal of the additional channel related to time or frequency synchronization may have a QCL relationship with another signal or channel transmitted on the baseline channel or additional channel.

[0052] Which signals are in a QCL relationship may be specified in the specifications, may be set in a broadcast signal or a higher layer signal transmitted on the baseline channel or additional channel, or may be notified in DCI transmitted on the baseline channel or additional channel.

[0053] For example, the baseline channel synchronization signal (B-SS), the baseline channel reference signal (B-CRS, B-TRS), or the additional channel synchronization signal (A-SS) may be used as the QCL source for the additional channel reference signal related to time or frequency synchronization.

[0054] In addition, the reference signal of the additional channel related to time or frequency synchronization may be a QCL source such as the downlink control channel of the baseline channel (B-PDCCH), the downlink shared channel of the baseline channel (B-PDSCH), the reference signal of the additional channel (A-CRS, A-TRS), the downlink control channel of the additional channel (A-PDCCH), or the downlink shared channel of the additional channel (A-PDSCH).

[0055] The reference signals of the additional channels related to time or frequency synchronization may be receivable by terminals 20 of a particular type or terminal capability.

[0056] Furthermore, the baseline channel signal and the additional channel signal related to time or frequency synchronization may be multiplexed in time, frequency, or code within the same BWP in the same cell or in different BWPs, or may be transmitted in different cells. That is, a common BWP may be defined or configured for the baseline channel and the additional channel, or separate BWPs may be defined or configured.

[0057] Example 3 In this embodiment, an example is shown in which the terminal 20 receives both a reference signal of a baseline channel related to time or frequency synchronization and a reference signal of an additional channel related to time or frequency synchronization.

[0058] Fig. 8 is a diagram illustrating the time / frequency synchronization process according to Example 3. As shown in Fig. 8, a terminal 20 receives both a reference signal of a baseline channel related to time or frequency synchronization and a reference signal of an additional channel related to time or frequency synchronization.

[0059] Terminal 20 may assume that a reference signal corresponding to a scheduled channel is transmitted only when a PDSCH of a baseline channel or an additional channel is scheduled. For example, terminal 20 may assume cross-carrier scheduling. Also, A-PDSCH may be scheduled by B-PDCCH, and A-CRS may be triggered.

[0060] As shown in Fig. 8, terminal 20 may perform time or frequency synchronization using both a baseline channel reference signal related to time or frequency synchronization and an additional channel reference signal related to time or frequency synchronization when they overlap in the time domain. In this case, the baseline channel reference signal related to time or frequency synchronization and the additional channel reference signal related to time or frequency synchronization may be combined to form a QCL relationship with another signal.

[0061] The terminal 20 may assume that the number of times that the reference signal of the baseline channel related to time or frequency synchronization is received is different from the number of times that the reference signal of the additional channel related to time or frequency synchronization is received. For example, the number of times that the reference signal of the baseline channel related to time or frequency synchronization is received may be assumed to be greater than the number of times that the reference signal of the additional channel related to time or frequency synchronization is received. This makes it possible to achieve time or frequency synchronization while distributing the load on each channel even when the bandwidth of the baseline channel is small.

[0062] (Effects of the wireless communication system according to this embodiment) In the wireless communication system according to this embodiment, the terminal 20 receives a reference signal of a baseline channel related to time or frequency synchronization. This allows time or frequency synchronization to be performed appropriately when the baseline channel and the additional channel are used in combination, and enables appropriate use of resources according to capabilities.

[0063] Furthermore, terminal 20 receives a reference signal of an additional channel related to time or frequency synchronization, which allows for appropriate time or frequency synchronization by effectively utilizing the additional channel, for example, when the bandwidth of the baseline channel is small.

[0064] The technology according to the present embodiment described above provides a technology that enables appropriate use of resources according to capabilities.

[0065] (Device configuration) Next, an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above will be described.

[0066] <Base station 10> Fig. 9 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 9, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 9 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations according to the embodiment of the present invention. Furthermore, the transmitting unit 110 and the receiving unit 120 may be collectively referred to as a communication unit.

[0067] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signals. The transmitter 110 also has a function of transmitting, to the terminal 20, an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL control signal, DCI via a PDCCH, data via a PDSCH, and the like.

[0068] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device provided in the setting unit 130, and reads out the information from the storage device as needed.

[0069] The control unit 140 schedules DL reception or UL transmission of the terminal 20 via the transmission unit 110. The control unit 140 also includes a function for performing LBT. The functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120. The transmission unit 110 may also be called a transmitter, and the reception unit 120 may also be called a receiver.

[0070] <Terminal 20> Fig. 10 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 10, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 10 is merely an example. As long as the operations related to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0071] The transmitter 210 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. The receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, DCI via PDCCH, data via PDSCH, and the like transmitted from the base station 10. For example, the transmitter 210 may transmit a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), and the like to another terminal 20 as D2D communication, and the receiver 120 may receive the PSCCH, PSSCH, PSDCH, PSBCH, and the like from the other terminal 20.

[0072] The setting unit 230 stores various setting information received by the receiving unit 220 from the base station 10 or other terminals in a storage device provided in the setting unit 230, and reads the information from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The control unit 240 controls the terminal 20. The control unit 240 also includes a function for performing LBT.

[0073] The terminal of this embodiment may be configured as the terminals shown in the following items. Also, the following communication methods may be implemented.

[0074] <Configuration of this embodiment> (Section 1) a receiving unit that receives, within the first band, information about the second band; a control unit that uses both the signal in the first band and the signal in the second band, The receiving unit receives a signal in the first band related to time or frequency synchronization. Terminal. (Section 2) The receiving unit further receives a signal in the second band related to time or frequency synchronization. 1. The terminal described in paragraph 1. (Section 3) the receiving unit receives both the signal in the first band related to time or frequency synchronization and the signal in the second band related to the second band related to time or frequency synchronization; 2. The terminal described in paragraph 2. (Section 4) the control unit performs time or frequency synchronization using the signal in the first band related to time or frequency synchronization and the signal in the second band related to time or frequency synchronization; 3. The terminal described in paragraph 3. (Section 5) receiving, within the first band, information relating to the second band; using both signals in the first band and signals in the second band; receiving a signal in the first band for time or frequency synchronization; The communication method implemented by the device.

[0075] Any of the above configurations provides a technology that enables appropriate use of resources according to capabilities. According to the second clause, a signal in a second band related to time or frequency synchronization can be received. According to the third clause, the load related to time or frequency synchronization can be distributed. According to the fourth clause, the load related to time or frequency synchronization can be distributed efficiently.

[0076] (Hardware configuration) The block diagrams (FIGS. 9 and 10) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for 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 may be realized using two or more devices that are physically or logically separated and connected directly or indirectly (for example, by wire, wirelessly, etc.). The functional block may be realized by combining software with the one device or the multiple devices.

[0077] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0078] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 11 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0079] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0080] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0081] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0082] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 9 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 10 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0083] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0084] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0085] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0086] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0087] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0088] Furthermore, base station 10 and terminal 20 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0089] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0090] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., DCI, UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0091] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0092] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0093] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0094] The information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0095] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0096] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0097] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0098] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0099] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0100] Note that terms explained 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 a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0101] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0102] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0103] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0104] In this disclosure, terms such as "base station (BS)," "radio base station," "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.

[0105] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0106] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0107] 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 some other suitable terminology.

[0108] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also 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 IoT (Internet of Things) device such as a sensor.

[0109] Furthermore, a base station in the present disclosure may be read as a terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0110] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station may be configured to have the functions of the terminal described above.

[0111] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0112] The terms "connected," "coupled," or any variation thereof, refer to 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" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0113] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0114] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0115] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0116] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0117] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0118] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed 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.

[0119] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0120] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0121] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0122] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0123] 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. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, or the like instead of a subframe. Furthermore, one slot may be called a unit time. The unit time may differ for each cell depending on the numerology.

[0124] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0125] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0126] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0127] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0128] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0129] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0130] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0131] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0132] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0133] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0134] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0135] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0136] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio 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, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0137] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0138] In the present 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 "coupled" may also be interpreted in the same way as "different."

[0139] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0140] Although the present disclosure has been described in detail above, it is 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 spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0141] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device

Claims

1. a receiving unit that receives, within the first band, information about the second band; a control unit that uses both the signal in the first band and the signal in the second band for synchronization; The control unit assumes that the first band signal related to time or frequency synchronization is a quasi co-located (QCL) source of the second band signal related to time or frequency synchronization; the receiving unit receives the first band signal related to the time or frequency synchronization more times than the second band signal related to the time or frequency synchronization; The control unit performs time or frequency synchronization using both the first band signal related to the time or frequency synchronization and the second band signal related to the time or frequency synchronization when the first band signal related to the time or frequency synchronization and the second band signal related to the time or frequency synchronization overlap in the time domain.

2. receiving, within the first band, information relating to the second band; using both the first in-band signal and the second in-band signal for synchronization; assuming that the first band signal associated with time or frequency synchronization is a quasi co-located (QCL) source of the second band signal associated with time or frequency synchronization; receiving the first band signal associated with the time or frequency synchronization more times than the second band signal associated with the time or frequency synchronization; performing time or frequency synchronization using both the first band signal related to the time or frequency synchronization and the second band signal related to the time or frequency synchronization when the first band signal related to the time or frequency synchronization and the second band signal related to the time or frequency synchronization overlap in the time domain; The communication method implemented by the device.

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