User terminal and transmission timing control method

Abstract

A user terminal is capable of appropriately controlling the transmission timing of an uplink signal applying multiple parameter sets. The user terminal has a receiving unit that receives a MAC CE (Media Access Control Control Element) including a time indicator from a base station; a control unit that adjusts the transmission timing of the uplink signal based on a value obtained by multiplying the time indicator by a granularity corresponding to a signal design of the uplink signal; and a transmitting unit that transmits the uplink signal with the adjusted transmission timing to the base station.

Description

[0001] This application is a divisional application of the invention patent application with the application date of October 31, 2017, application number 201780096469.1, and invention name “User terminal and transmission timing control method”. Technical Field

[0002] The invention relates to a user terminal and a sending timing control method. Background Art

[0003] In the UMTS (Universal Mobile Telecommunication System) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-patent document 1). In addition, the successor systems of LTE are also studied for the purpose of further broadband domain and high speed compared to LTE. Among the successor systems of LTE, there are technologies such as LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G+ (5G plus), New-RAT (Radio Access Technology), etc.

[0004] In wireless communication systems, time alignment is important to prevent symbol interference of uplink signals. Non-patent documents 2 and 3 define TA (Time Advance) and the like for time alignment.

[0005] Research is underway to introduce multiple parameter sets (Numerology) in next-generation wireless communication systems such as 5G. For example, research is underway to apply multiple subcarrier spacings (SCS: Sub Carrier Spacing) to uplink signals in next-generation wireless communication systems.

[0006] Prior art literature

[0007] Non-patent literature

[0008] Non-patent document 1: T.Okuyama et.al.: "Antenna Deployment for 5G Ultra High-Density Distributed Antenna System at Low SHF Bands" Standards for Communications and Networking (CSCN), 2016, pp.1-6, Nov. 2016, Berlin, Germany

[0009] Non-patent document 2: 3GPP TS 36.321v14.3.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification (Release 14),” June 2017

[0010] Non-patent document 3: 3GPP TS 36.211v13.3.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 13),” September 2016 Summary of the invention

[0011] Problems to be solved by the invention

[0012] However, there is no regulation on the transmission timing control of uplink signals using multiple parameter sets.

[0013] Therefore, an object of the present invention is to provide a user terminal and a transmission timing control method for controlling transmission timing of an uplink signal using a plurality of parameter sets.

[0014] Means for solving problems

[0015] The user terminal of the present invention comprises: a receiving unit, which receives a MAC CE (Media Access Control Element) including a time indicator from a base station; a control unit, which adjusts the sending timing of the uplink signal based on a value obtained by multiplying the time indicator by a granularity corresponding to the signal design of the uplink signal; and a sending unit, which sends the uplink signal with the adjusted sending timing to the base station.

[0016] Effects of the Invention

[0017] According to the present invention, it is possible to appropriately perform transmission timing control of an uplink signal to which a plurality of parameter sets are applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram showing a configuration example of a wireless communication system according to the first embodiment.

[0019] Figure 2 This is a diagram illustrating an example of time alignment of uplink signals.

[0020] Figure 3 This is a diagram showing an example of the RA process.

[0021] Figure 4 It is a diagram showing an example of the data structure of MAC RAR.

[0022] Figure 5 This is a diagram showing an example of notification of a TA value using a TA command (TA command) MAC CE.

[0023] Figure 6 This is a diagram showing an example of the data structure of a TA command (TA command) MAC CE.

[0024] Figure 7 This is a diagram for explaining the conversion of TA command (TA command) into time.

[0025] Fig. 8A This is a diagram illustrating an example of a parameter set.

[0026] Figure 8B This is a diagram illustrating an example of a parameter set.

[0027] Fig. 9 This is an example of the frame structure of gNB.

[0028] Fig.10 This is an example of the frame structure of UE.

[0029] Fig.11 This is a diagram showing an example of the data structure of a storage unit.

[0030] Fig.12 This is a diagram showing an example of an RA procedure corresponding to a parameter set of an uplink signal.

[0031] Fig.13 This is a diagram showing an example of the data structure of a TA command (TA command) MAC CE corresponding to a parameter set of an uplink signal.

[0032] Fig.14This is a diagram showing another data structure example of a TA command (TA command) MAC CE corresponding to a parameter set of an uplink signal.

[0033] Fig.15 This is a diagram showing another data structure example of a TA command (TA command) MAC CE corresponding to a parameter set of an uplink signal.

[0034] Fig.16 This is a diagram showing an example of LCID values.

[0035] Fig.17 It is a diagram for explaining an operation example of the wireless communication system according to the second embodiment.

[0036] Fig.18 It is a diagram for explaining an operation example of the wireless communication system involved in the third embodiment.

[0037] Fig.19 It is a diagram for explaining an operation example of the wireless communication system involved in the fourth embodiment.

[0038] Fig. 20A It is a diagram for explaining an operation example of the wireless communication system involved in the fifth embodiment.

[0039] Fig. 20B It is a diagram for explaining an operation example of the wireless communication system involved in the fifth embodiment.

[0040] Fig. 20C It is a diagram for explaining an operation example of the wireless communication system involved in the fifth embodiment.

[0041] Fig.21 This is a diagram showing an example of the hardware structure of a gNB and a UE involved in one embodiment of the present invention. DETAILED DESCRIPTION

[0042] Embodiments of the present invention will be described below with reference to the drawings.

[0043] (First Embodiment)

[0044] Figure 1 FIG. 1 is a diagram showing a configuration example of a wireless communication system according to the first embodiment. Figure 1 As shown, the wireless communication system has gNB1, UE2a, and 2b. Figure 1 Represents the cell C1 formed or provided by gNB1.

[0045] Figure 1 The gNB1 shown is a base station. UE2a, 2b are user terminals such as smartphones or tablet terminals. Figure 1In the wireless communication system shown, the name of the base station is set to gNB, but is not limited thereto. For example, Figure 1 The base station shown may also be referred to as an eNB.

[0046] gNB1 and UE2a and UE2b perform wireless communication based on 5G (New Radio: NR), which is a next-generation wireless communication system. In the wireless communication between gNB1 and UE2a and UE2b, a parameter set is applied, for example, multiple SCSs are applied to the uplink signals of UE2a and UE2b (for example, refer to Fig. 8A , Figure 8B ).

[0047] In addition, the parameter set refers to a set of communication parameters that characterizes the design of a signal in a certain RAT (Radio Access Technology) or the design of a RAT. Here, it is assumed to refer to the SCS or OFDM (Orthogonal Frequency Division Multiplexing) symbol length.

[0048] gNB1 receives uplink signals sent from UE2a and 2b residing in cell C1, aggregates them and performs fast Fourier transform (FFT), and then demodulates the uplink signals of each UE2a and 2b. UE2a and 2b are located in various places within cell C1, for example, near gNB1 or at the cell edge of cell C1. Therefore, even if uplink signals are sent from each UE2a and 2b at the same time, each uplink signal arrives at gNB1 at a different time due to propagation delay, etc.

[0049] If the difference in arrival time between the uplink signal of UE2a and the uplink signal of UE2b at gNB1 exceeds the time width of CP (Cyclic Prefix), the uplink signal of UE2a and the uplink signal of UE2b may cause inter-symbol interference. To avoid this inconvenience, gNB1 notifies UE2a and 2b of the TA (Timing Advance) value and makes the uplink signals sent from UE2a and 2b arrive at gNB1 at the same time (including approximately the same time).

[0050] Figure 2 This is a diagram illustrating an example of time alignment of uplink signals. First, gNB1 sends a downlink signal to UE2a (step S1). The downlink signal reaches UE2a with a propagation delay of τ (step S2).

[0051] If UE2a receives a downlink signal in step S2, it sends an uplink signal (step S3). The uplink signal also reaches gNB1 with a propagation delay of τ. Therefore, after gNB1 sends the downlink signal in step S1, it receives the uplink signal after a period of 2τ (step S4). Figure 2 Although not shown, gNB1 measures the difference (2τ) between the sending timing of the downlink signal of step S1 and the receiving timing of the uplink signal of UE2a, and notifies UE2a of the TA value of the period.

[0052] UE2a sends an uplink signal at a timing that is earlier than its own reference timing (downlink reception timing) by the notified TA value (step S5). As a result, gNB1 can receive the uplink signal from UE2a at its own reference timing (step S6).

[0053] gNB1 also performs the above processing on UE2b. Therefore, gNB1 can simultaneously receive uplink signals sent from UE2a and 2b.

[0054] The following two methods are described as methods of notifying the user terminal of the TA value.

[0055] 1. RAR (Random Access Response)

[0056] 2.TA command MAC CE (Media Access Control Control Element)

[0057] First, notification of the TA value using RAR will be described.

[0058] Figure 3 1 is a diagram showing an example of the RA process. The user terminal selects any one of the preamble indices that can be used as the RA preamble, and transmits the RA preamble (Msg1) to the base station. The preamble index is an identifier of the RA preamble transmitted by the user terminal, and is called a signature.

[0059] The base station transmits a response (Msg2) to the user terminal as a response to the RA preamble. The RA response includes a TA command (TA value) and a UL grant.

[0060] The user terminal can determine whether a response to the transmitted RA preamble has been received by determining the preamble index (not shown) included in the RA response. If the user terminal receives a response to the transmitted RA preamble, it controls the transmission timing of the uplink signal based on the TA command included in the RA response.

[0061] As described above, the TA value (TA command) is notified to the user terminal through Msg2 of the RA process. In addition, the TA command is an index, which is converted into a time (see Figure 7 ).

[0062] Figure 4 This is a diagram showing an example of the data structure of MAC RAR. The MAC PDU (Protocol Data Unit) of RA includes a MAC header and a MAC RAR following the MAC header.

[0063] like Figure 4 As shown, MAC RAR has a TA command field ( Figure 4 The TA value is determined by Figure 4 The base station notifies the user terminal of the TA command field shown in FIG. 1. The user terminal controls the transmission timing of the uplink signal based on the TA command of the MAC RAR notified from the base station.

[0064] Next, notification of the TA value using the TA command (TA command) MAC CE will be described.

[0065] Figure 5 FIG. 1 is a diagram showing an example of notifying a TA value using a TA command (TA command) MAC CE. Figure 5 As shown, a TA command (TA command) MAC CE is sent from a base station to a user terminal. The TA command (TA command) MAC CE includes a TA command (TA command), and the TA command (TA command) is sent from the base station to the user terminal periodically, for example.

[0066] Figure 6The MAC PDU of the TA command includes a MAC header, a TA command MAC CE following the MAC header, and an SDU (Service Data Unit) following the TA command MAC CE.

[0067] like Figure 6 As shown in FIG. 1 , the TA command MAC CE has a TAG (TA Group) ID field and a TA command field. The TA value is obtained by Figure 6 The base station notifies the user terminal of the TA command field shown in FIG. 1. The user terminal controls the transmission timing of the uplink signal based on the TA command of the MAC CE notified by the base station.

[0068] As described above, the TA value (TA command) is notified to the user terminal through the TA command MAC CE.

[0069] Figure 7 This is a diagram for explaining the conversion of TA command into time. The user terminal transmits an uplink signal to the base station at a timing that is advanced by an amount corresponding to the TA command notified from the base station. For example, the user terminal transmits the uplink signal to the base station by an amount of time indicated by the following equation (1).

[0070] T adj =(N TA +N TA offset )·T s (1)

[0071] N shown in formula (1) TA offset The value of N changes according to the type of frame structure of the uplink signal. TA It is a value corresponding to (proportional to) the TA command (TA command) (index). s is the N that will be used as the index value TA offset and N TA Converted to a time value. T s For example, it is shown by the following formula (2).

[0072] T s =1 / (15000×2048) (2)

[0073] As described above, the TA command is sent from the base station to the user terminal via the MAC RAR or MAC CE. Therefore, the user terminal can calculate the time for adjusting the transmission timing of the uplink signal using equations (1) and (2), thereby adjusting the transmission timing of the uplink signal.

[0074] like Figure 1 As described, in the NR wireless communication system, multiple parameter sets (SCS) can be applied to uplink signals.

[0075] Fig. 8A as well as Figure 8B is a diagram illustrating an example of a parameter set. Fig. 8A In the process, UE2a sends the uplink signal to gNB1 through PCell (Primary Cell). At a certain time, UE2a sets the SCS of all subcarriers of PCell to SCS#X, and at other times, sets the SCS of all subcarriers of PCell to SCS#Y. That is, UE2a changes the SCS of subcarriers of PCell according to time. SCS#X and SCS#X are set to values ​​of 15kHz, 30kHz, 60kHz, and 120kHz, for example (SCS#X≠SCS#X). In addition, UE2a may also set the SCS of some subcarriers of Pcell to SCS#X, and set the SCS of other subcarriers of Pcell to SCS#Y.

[0076] exist Figure 8B In the example, UE2b sends the uplink signal to gNB1 through PCell and SCell (Secondary Cell). UE2b sets the SCS of the subcarriers of PCell to SCS#X and the SCS of the subcarriers of SCell to SCS#Y.

[0077] exist Figure 8B In , PCell and SCell belong to the same TAG. Figure 8B In this case, the transmission timing of the uplink signal of the PCell and the uplink signal of the SCell are controlled based on the same TA command (TA command).

[0078] Here, the OFDM symbol length of the uplink signal changes according to the SCS. For example, if the SCS is large, the OFDM symbol length becomes shorter, and if the SCS is small, the OFDM symbol length becomes longer.

[0079] The uplink signal with short OFDM symbol length requires stricter time alignment than the uplink signal with long OFDM symbol length. For example, even if there is no symbol interference in the uplink signal with long OFDM symbol length, there may be symbol interference in the uplink signal with short OFDM symbol length due to a certain time alignment deviation.

[0080] Therefore, in Figure 1 In the wireless communication system shown, the granularity of the TA command (the width of one index of the TA command) is changed according to SCS #X, #Y (according to the OFDM symbol length).

[0081] For example, in Fig. 8A as well as Figure 8B In the example, let "SCS#X<SCS#Y". Figure 1 The wireless communication system is set to "the granularity of the TA command (TA command) of the uplink signal of SCS#X>the granularity of the TA command (TA command) of the uplink signal of SCS#Y" (that is, the granularity of the TA command (TA command) of the uplink signal of SCS#X is coarser than that of SCS#Y).

[0082] In addition, it is assumed that the TA command of the same granularity is applied to the uplink signal of SCS#X and the uplink signal of SCS#Y regardless of SCS#X and #Y. In this case, for example, the uplink signal of SCS#Y having a shorter OFDM symbol length than the uplink signal of SCS#X is not subject to transmission timing control based on a fine time unit, so there is a possibility of causing symbol interference.

[0083] Fig. 9 This is an example of the frame structure of gNB1. Fig. 9 In the figure, the functional units or processing units of gNB1 that are related to the implementation scheme are representatively shown. Fig. 9 As shown, gNB1 has a downlink signal sending unit 11, an uplink signal receiving unit 12, a received signal demodulation unit 13, a measurement unit 14, a CC (Component Carrier) management unit 15, a TAG determination unit 16, and a downlink signal generating unit 17.

[0084] The downlink signal transmission unit 11 performs processing of transmitting downlink signals to UE2a, 2b. For example, the downlink signal transmission unit 11 transmits RAR including TA command, MAC CE including TA command, and RRC (Radio Resource Control) connection reconfiguration message to UE2a, 2b.

[0085] The uplink signal receiving unit 12 performs processing for receiving uplink signals from UE 2a, 2b. For example, the uplink signal receiving unit 12 receives RA preamble, PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel), SRS (Sounding Reference Symbols), etc.

[0086] The received signal demodulation unit 13 demodulates the control data and user data included in the received signal.

[0087] The measuring unit 14 measures the reception timing of an uplink signal or the reception quality of each CC, and the like.

[0088] The CC management unit 15 manages CCs currently used by the UE 2 a , 2 b , CCs that can be used by the UE 2 a , 2 b , and the like.

[0089] The TAG determination unit 16 determines whether to change the TAG and the method of change based on the measurement result of the measurement unit 14 .

[0090] The downlink signal generating unit 17 generates a downlink signal to be transmitted to the UE 2a and 2b. For example, the downlink signal generating unit 17 generates a RA response including a TA command and a message of RRC connection reconfiguration.

[0091] Fig.10 This is an example of the frame structure of UE2a. Fig.10 1 and 2 represent representatively the functional units or processing units of UE2a that are related to the implementation scheme. Fig.10 As shown, UE2a includes an uplink signal sending unit 21, a downlink signal receiving unit 22, a received signal demodulating unit 23, a measuring unit 24, a timing control unit 25, an uplink signal generating unit 26, and a storage unit 27.

[0092] The uplink signal sending unit 21 processes the uplink signal to be sent to gNB 1. For example, the uplink signal sending unit 21 sends the RA preamble, PUSCH, PUSCH, and SRS, etc.

[0093] The downlink signal receiving unit 22 processes the downlink signal received from gNB 1. For example, the downlink signal receiving unit 22 receives a RAR including a TA command, a MAC CE including a TA command, and a message of RRC connection reconfiguration.

[0094] The received signal demodulation unit 23 demodulates the control data and user data contained in the received signal. The measurement unit 24 measures the reception quality of the downlink signal, etc. The reception quality is used, for example, for demodulation of the received signal and is sent to gNB1.

[0095] The timing control unit 25 controls the transmission timing of the uplink signal. For example, the timing control unit 25 controls the transmission timing of the uplink signal based on a TA command and a granularity of the TA command described below.

[0096] The uplink signal generating unit 26 generates an uplink signal to be sent to gNB 1. For example, the uplink signal generating unit 26 generates an RA preamble, a PUCCH (Physical Uplink Control Channel), a PUSCH (Physical Uplink Shared Channel), an SRS, and the like.

[0097] The storage unit 27 stores data used by the UE 2a to perform various operations. For example, the SCS and the granularity of the TA command are associated and stored in the storage unit 27. In the above, the block configuration example of the UE 2a is described, but the UE 2b also has the same block configuration.

[0098] Fig.11 2 is a diagram showing an example of the data structure of the storage unit 27. Fig.11 As shown, the SCS and the granularity of the TA command (unit in the figure) are stored in correspondence in the storage unit 27. The granularity of the TA command, for example, indicates what value (width) an index such as "1" which is the minimum unit of the TA command is converted into.

[0099] The TA command sent from gNB1 is multiplied by the granularity. As described above, the TA command is an index, and by multiplying it by the granularity, the width (coarseness) of 1 index is converted.

[0100] like Fig.11 As shown, the larger the SCS is, the smaller the granularity of the TA command is. In other words, the shorter the OFDM symbol length is, the smaller the granularity of the TA command is.

[0101] Explain timing adjustments in RAR.

[0102] Fig.12 This is a diagram showing an example of an RA procedure corresponding to a parameter set of an uplink signal. Fig.11 The processing of message 1 (Msg1) and message 2 (Msg2) shown in Figure 3 The processing of Msg1 and Msg2 described in is the same, and their description is omitted.

[0103] UE2a determines the SCS of the uplink signal (PUSCH) used for sending Msg3. UE2a refers to storage unit 2 to obtain the granularity of the TA command (TA command) corresponding to the determined SCS of the uplink signal. UE2a calculates the transmission timing adjustment time of the uplink signal based on the granularity obtained by referring to storage unit 27 and the TA command (TA command) received in Msg2. UE2a adjusts the transmission timing of the uplink signal with the calculated transmission timing adjustment time. In the above, UE2a is explained, but the same is true for UE2b.

[0104] In this way, UE2a and 2b calculate the transmission timing adjustment time corresponding to the SCS and adjust the transmission timing of the uplink signal.

[0105] This describes the use of the TA command to adjust the timing of the MAC CE.

[0106] Fig.13 FIG. 1 is a diagram showing an example of the data structure of a TA command MAC CE corresponding to a parameter set of an uplink signal. Fig.13 As shown, the TA command MAC CE has a TA command field and a SCSI ID field. In the SCS ID field, an identifier for identifying the SCS to which the uplink signal of the TA command is applied is stored.

[0107] UE2a, for example, periodically receives a TA command MAC CE from gNB1. The received TA command MAC CE has the following information: Fig.13 The data structure example shown.

[0108] If UE2a receives a TA command MAC CE from gNB1, it refers to storage unit 27 to obtain the granularity of the TA command corresponding to the SCS ID included in the received TA command MAC CE. For example, the SCS ID included in the TA command MAC CE indicates Fig.11 For any of the SCSs shown, UE2a obtains the granularity of the TA command (TA command) corresponding to the SCS indicated by the SCS ID. In addition, the association between the SCS ID and the SCS (or the granularity of the TA command (TA command) of the uplink signal of the SCS) can also be set by any layer such as the RRC layer, the MAC layer, or the physical layer.

[0109] UE2a calculates the transmission timing adjustment time of the uplink signal based on the granularity obtained by referring to the storage unit 27 and the TA command (TA command) included in the TA command (TA command) MAC CE received from gNB1. UE2a adjusts the transmission timing of the uplink signal with the calculated transmission timing adjustment time. In the above, UE2a is described, but the same is true for UE2b.

[0110] In this way, UE2a and 2b calculate the transmission timing adjustment time corresponding to the SCS and adjust the transmission timing of the uplink signal.

[0111] (Variant 1)

[0112] exist Fig.13 In the TA command (TA command) MAC CE, a new field such as SCS ID is set. In contrast, instead of setting a new field in the TA command (TA command) MAC CE, a part of the field of the existing TA command (TA command) can be set as a field for identifying the SCS identifier.

[0113] Fig.14 FIG. 1 is a diagram showing another data structure example of a TA command MAC CE corresponding to a parameter set of an uplink signal. Fig.14 As shown in FIG. 1 , the MAC CE has a TA command field. Fig.14In the MAC CE shown, a part of the field of the TA command becomes a field indicating the SCS ID. For example, Fig.14 The field indicated by the dotted line is a field indicating the SCS ID.

[0114] In this way, gNB1 can also use the field of the existing TA command to notify UE2a, 2b of SCSID.

[0115] (Variant 2)

[0116] Fig.15 FIG. 1 is a diagram showing another data structure example of a TA command MAC CE corresponding to a parameter set of an uplink signal. Fig.15 As shown, the MAC PDU has a field of LCID (Logical Channel ID). LCID is an identifier indicating the data type of the subsequent fields.

[0117] Fig.16 This is a diagram showing an example of LCID values. Fig.16 The index (Index) shown indicates the possible values ​​of LCID. The LCID value (LCID value) indicates the data type of the field following the LCID field.

[0118] For example, when the LCID is "11101", it means that the TAG ID and TA command (TA command) are stored in the subsequent fields of the LCID (see Fig.15 ). In addition, the TAG ID and TA command (TA command) in the subsequent fields indicating the LCID are the TAG ID and TA command (TA command) of the uplink signal of SCS#X.

[0119] For example, when the LCID is "11100", it means that the TAGID and TA command (TA command) are stored in the subsequent fields of the LCID (see Fig.15 ). In addition, the TAG ID and TA command (TA command) in the subsequent fields of the LCID are the TAG ID and TA command (TA command) of the uplink signal of SCS#Y.

[0120] In this way, gNB1 can use LCID to specify the data category of the subsequent fields of LCID, and specify the SCS to which TAGID and TA command (TA command) are applied.

[0121] In addition, Fig.15In the MAC header, the TAG ID and the TA command are stored in the MAC header, but can also be stored in the MAC CE of the payload following the MAC header.

[0122] (Variant 3)

[0123] The SCS ID may be notified to UE2a and 2b through a NW (Network) control signal. For example, the SCS ID may be notified to UE2a and 2b using broadcast information or a dedicated control signal of RRC.

[0124] As described above, UE2a and 2b receive a TA command MAC CE containing a TA command (TA command) for adjusting the transmission timing of the uplink signal and identification information of the SCS for identifying the uplink signal from gNB1. UE2a and 2b calculate the transmission timing adjustment time of the uplink signal based on the value obtained by multiplying the TA command (TA command) and the granularity corresponding to the SCS. Then, UE2a and 2b adjust the transmission timing of the uplink signal based on the transmission timing adjustment time and send it to gNB1.

[0125] As a result, UE2a and 2b can appropriately perform transmission timing control of uplink signals to which a plurality of parameter sets are applied.

[0126] In addition, if Fig.13 As shown, by setting a new field of SCS ID in the TA command MAC CE and notifying UE2a, 2b of the SCS ID, the wireless communication system can dynamically change the TA command.

[0127] In addition, if Fig.14 As shown, by using the existing field to notify the SCS ID to UE2a, 2b, the wireless communication system can dynamically change the TA command (TA command) and suppress the overhead of data transmission.

[0128] In addition, if Fig.15 as well as Fig.16 As shown, by not setting a new field in the TA command MAC CE and using LCID to notify the SCS ID to UE2a, 2b, the wireless communication system can dynamically change the TA command and suppress the overhead of data transmission.

[0129] In addition, by notifying UE2a and 2b of the SCS ID through the NW control signal, the wireless communication system can dynamically change the TA command MAC CE and suppress the overhead of data transmission.

[0130] (Second Embodiment)

[0131] The second embodiment is described below. In the second embodiment, the granularity of the TA command (TAcommand) is specified by the SCS of the downlink signal. The parts different from the first embodiment are described below.

[0132] Fig.17 This is a diagram for explaining an operation example of a wireless communication system according to the second embodiment. gNB1 specifies an uplink signal to which the SCS of the TA command (TA command) is applied through the SCS of the PDSCH including the TA command (TA command) MAC CE. Then, UE2a obtains the granularity of the TA command (TA command) included in the received TA command (TA command) MAC CE by referring to the storage unit 27 based on the SCS of the received PDSCH.

[0133] For example, Fig.17 As shown by arrow A1, gNB1 sends a TA command (TA command MAC CE) to UE2a via the PDSCH of SCS#X. UE2a determines the SCS#X of the received PDSCH. UE2a refers to storage unit 27 to obtain the granularity of the TA command corresponding to the determined SCS#X. For example, when SCS#X is "15kHz", Fig.11 In the example shown, UE2a obtains the granularity "16*64·T s ". As a result, UE2a can calculate the sending timing adjustment time of the uplink signal of SCS#X based on the TA command (TA command) received from gNB1 and the acquired granularity.

[0134] In addition, for example, Fig.17 As shown by arrow A2, gNB1 sends a TA command to UE2a in the PDSCH of SCS#Y. UE2a determines the SCS#Y of the received PDSCH. UE2a refers to storage unit 27 to obtain the granularity of the TA command corresponding to the determined SCS#Y. For example, when SCS#Y is "30kHz", Fig.11 In the example shown, UE2a obtains the granularity "8*64·T s". As a result, UE2a can calculate the sending timing adjustment time of the uplink signal of SCS#Y based on the TA command (TA command) received from gNB1 and the obtained granularity.

[0135] In addition, for example, Fig.17 As shown by arrow A4, gNB1 sends a TA command (TA command) with a different value from the TA command (TA command) shown by arrow A2 to UE2a through the PDSCH of SCS#Y. UE2a determines the SCS#Y of the received PDSCH. UE2a refers to storage unit 27 to obtain the granularity of the TA command (TA command) corresponding to the determined SCS#Y. As a result, UE2a can update (change) the transmission timing adjustment time of the uplink signal of SCS#Y.

[0136] In addition, Fig.17 In the arrow A3, the transmission of the PDSCH of SCS#X fails. At this time, the transmission timing adjustment time of the uplink signal of SCS#X of UE2a is not updated. In addition, in the above, UE2a is described, but the same is true for UE2b.

[0137] As described above, UE2a and 2b receive a TA command (TA command) MAC CE from gNB1, which includes a TA command (TA command) for adjusting the transmission timing of the uplink signal and identification information for identifying the SCS of the uplink signal. UE2a and 2b determine the SCS of the PDSCH that transmits the TA command (TA command) MAC CE. UE2a and 2b calculate the transmission timing adjustment time of the uplink signal based on the value obtained by multiplying the TA command (TA command) and the granularity corresponding to the determined SCS. Then, UE2a and 2b adjust the transmission timing of the uplink signal based on the transmission timing adjustment time and send it to gNB1.

[0138] As a result, UE2a and UE2b can appropriately control the transmission timing of uplink signals applying multiple parameter sets. In addition, the wireless communication system can dynamically change the TA command. In addition, the wireless communication system does not need to set a new field for notifying the SCS ID in the TA command MAC CE, thereby suppressing the overhead of data transmission.

[0139] In addition, in the above, UE2a, 2b obtains the granularity of the TA command (TA command) contained in the received TA command (TA command) MAC CE based on the SCS of the received PDSCH, but is not limited to this. For example, UE2a, 2b can also obtain the granularity of the TA command (TA command) based on the SCS of the BWP (BandWidth Parts) or the PDCCH corresponding to the PDSCH.

[0140] In addition, when HARQ (Hybrid ARQ) retransmission of PDSCH is performed by different SCSs, UE2a and 2b can also obtain the granularity of the TA command through the SCS of the HARQ sent for the first time.

[0141] (Third Embodiment)

[0142] The third embodiment is described below. In the third embodiment, UE2a, 2b obtains the granularity of the TA command (TAcommand) notified after the RA process based on the SCS of message 3 (Msg3) sent to gNB1 in the most recent (last implemented) RA process. The following describes the parts that are different from the first embodiment.

[0143] Fig.18 It is a diagram for explaining an operation example of the wireless communication system involved in the third embodiment. Fig.18 RA procedures P1 and P2 are shown in UE2a. UE2a acquires the granularity of the TA command (TA command) notified after the RA procedures P1 and P2 based on the SCS of the message 3 (Msg3) transmitted in the most recent RA procedures P1 and P2.

[0144] For example, as indicated by arrow A11, UE2a transmits Msg3 of RA procedure P1 in PUSCH of SCS#X. UE2a stores SCS#X of PUSCH in which Msg3 is transmitted in storage unit 27.

[0145] like Fig.18 As shown by arrow A12, UE2a receives a TA command (TA command MAC CE) from gNB1. At this time, UE2a obtains SCS#X (SCS of Msg3 sent in the most recent RA process P1) stored in storage unit 27. UE2a refers to storage unit 27 (for example, Fig.11) to obtain the granularity of the TA command corresponding to the obtained SCS#X. Thus, UE2a can calculate the transmission timing adjustment time of the uplink signal of SCS#X according to the TA command received from gNB1 and the obtained granularity.

[0146] In addition, for example, as indicated by arrow A13, UE2a transmits Msg3 of RA procedure P2 in PUSCH of SCS#Y. UE2a stores SCS#Y of PUSCH in which Msg3 is transmitted in storage unit 27.

[0147] like Fig.18 As shown by arrow A14, UE2a receives a TA command (TA command MAC CE) from gNB1. At this time, UE2a obtains SCS#Y (SCS of Msg3 sent in the most recent RA process P2) stored in storage unit 27. UE2a refers to storage unit 27 (for example, Fig.11 ) and obtains the granularity of the TA command corresponding to the obtained SCS#Y. Thus, UE2a can calculate the transmission timing adjustment time of the uplink signal of SCS#Y according to the TA command received from gNB1 and the obtained granularity. In the above, UE2a is explained, but the same is true for UE2b.

[0148] As described above, UE2a, 2b stores the SCS of Msg3 sent to gNB1 in the most recent RAP. After the RAP, UE2a, 2b receives the TA command MAC CE containing the TA command from gNB1. UE2a, 2b calculates the transmission timing adjustment time of the uplink signal based on the value obtained by multiplying the received TA command and the granularity corresponding to the SCS of the stored Msg3. Then, UE2a, 2b adjusts the transmission timing of the uplink signal based on the transmission timing adjustment time and sends it to gNB1.

[0149] As a result, UE2a and UE2b can appropriately control the transmission timing of uplink signals applying multiple parameter sets. In addition, the wireless communication system can dynamically change the TA command. In addition, the wireless communication system does not need to set a new field for notifying the SCS ID in the TA command MAC CE, thereby suppressing the overhead of data transmission.

[0150] (Fourth Embodiment)

[0151] The fourth embodiment is described below. In the fourth embodiment, the granularity of the TA command is specified by the multiplexing number of TA command MAC CEs included in the MAC PDU. The parts different from the first embodiment are described below.

[0152] Fig.19 It is a diagram for explaining an operation example of the wireless communication system involved in the fourth embodiment. Fig.19 MAC PDU31 and 32 are shown in FIG. UE2a obtains the granularity of the TA command based on the multiplexed number of the TA command MAC CE included in the MAC PDU31 and 32. In addition, the multiplexed number of the TA command MAC CE and the granularity of the TA command are associated and stored in the storage unit 27. For example, Fig.11 The "SCS" column shown is the multiplexing quantity of the TA command MAC CE.

[0153] For example, Fig.19 As shown by arrow A21, gNB1 sends a TA command to UE2a. At this time, as shown in MAC PDU31, it contains 1 TA command MAC CE (multiplexing quantity 1), and gNB1 sends it to UE2a.

[0154] UE2a determines the multiplexing quantity of the TA command MAC CE included in the received MAC PDU31. Since MAC PDU31 contains one TA command MAC CE, it is determined to be the multiplexing quantity 1. UE2a refers to the storage unit 27 to obtain the granularity of the TA command corresponding to the determined multiplexing quantity 1. Thus, UE2a can, for example, calculate the transmission timing adjustment time of the uplink signal of SCS#X based on the TA command received from gNB1 and the obtained granularity.

[0155] In addition, for example, Fig.19 As shown by arrow A22, gNB1 sends a TA command to UE2a. At this time, as shown in MAC PDU32, it contains 2 TA command MAC CEs (multiplexing quantity 2), and gNB1 sends it to UE2a. In addition, the same TA command is stored in the TA command MAC CE multiplexed into MAC PDU32.

[0156] UE2a determines the multiplexing quantity of the TA command (TA command) MAC CE included in the received MAC PDU32. Since MAC PDU32 contains two TA command (TA command) MAC CEs, it is determined to be a multiplexing quantity of 2. UE2a refers to the storage unit 27 to obtain the granularity of the TA command (TA command) corresponding to the determined multiplexing quantity 2. Thus, UE2a can, for example, calculate the transmission timing adjustment time of the uplink signal of SCS#Y based on the TA command (TA command) received from gNB1 and the obtained granularity. In the above, UE2a is described, but the same is true for UE2b.

[0157] As described above, UE2a and 2b obtain the granularity of the TA command by the multiplexing number of the TA command MAC CE included in the MAC PDU. UE2a and 2b calculate the transmission timing adjustment time of the uplink signal based on the value obtained by multiplying the TA command received through the TA command MAC CE and the obtained granularity of the TA command. Then, UE2a and 2b adjust the transmission timing of the uplink signal based on the transmission timing adjustment time and send it to gNB1.

[0158] This allows UE2a and UE2b to appropriately perform transmission timing control of uplink signals to which a plurality of parameter sets are applied. In addition, the wireless communication system can dynamically change the TA command.

[0159] In addition, when MIMO (Multiple-Input and Multiple-Output) and CA (Carrier Aggregation) can be used to send multiple MAC PDUs at the same timing by both or one party, gNB1 can also include one TA command MAC CE in each MAC PDU. UE2a, 2b can also obtain the granularity of the TA command based on the number of TA command MAC CEs received at the same timing.

[0160] (Fifth Embodiment)

[0161] The fifth embodiment is described below. In the fifth embodiment, UE2a and 2b obtain granularities corresponding to multiple SCSs used in the transmission of uplink signals, and select the smallest granularity among the obtained granularities. UE2a and 2b calculate the transmission timing adjustment time of the uplink signal based on the selected granularity and the TA command. The parts different from the first embodiment are described below.

[0162] Fig. 20A , Fig. 20B ,as well as Fig. 20C FIG. 1 is a diagram for explaining an operation example of the wireless communication system according to the fifth embodiment. Fig. 20A , UE2a sends an uplink signal to gNB1 through PCell. UE2a sets the SCS of all subcarriers of PCell to SCS#15kHz at a certain time, and sets the SCS of all subcarriers of PCell to SCS#30kHz at other times. That is, UE2a changes the SCS of subcarriers of PCell according to time. In addition, UE2a can also set the SCS of some subcarriers of Pcell to SCS#15kHz, and set the SCS of other subcarriers of Pcell to SCS#30kHz.

[0163] UE2a refers to storage unit 27 to obtain the granularity corresponding to SCS#15kHz and the granularity corresponding to SCS#30kHz. UE2a selects the smallest granularity from the obtained granularities. Fig. 20A In this case, UE2a selects the granularity corresponding to SCS#30kHz. If the TA command is notified by MAC CE through the TA command, UE2a uses the selected granularity and the notified TA command to calculate the transmission timing adjustment time of the uplink signal.

[0164] Compared with the uplink signal of SCS#30kHz, the uplink signal of SCS#15kHz can also calculate the transmission timing adjustment time with a longer OFDM symbol length and a coarser granularity. However, UE2a calculates the transmission timing adjustment time in accordance with the granularity of SCS#30kHz that requires the transmission timing adjustment time based on the fine granularity. Thus, UE2a can calculate the transmission timing adjustment time of the uplink signal according to the TA command received from gNB1 and the selected granularity.

[0165] exist Fig. 20BIn the example, UE2a sends an uplink signal to gNB1 through PCell and SCell. UE2a sets the SCS of the subcarriers of PCell to SCS#15kHz and the SCS of the subcarriers of SCell to SCS#30kHz.

[0166] exist Fig. 20B In , PCell and SCell belong to the same TAG. Fig. 20B In this case, the transmission timing of the uplink signal of the PCell and the uplink signal of the SCell are controlled based on the same TA command (TA command).

[0167] UE2a refers to storage unit 27 to obtain the granularity corresponding to SCS#15kHz and the granularity corresponding to SCS#30kHz belonging to the same TAG. UE2a selects the smallest granularity among the obtained granularities. Fig. 20B In this case, UE2a selects the granularity corresponding to SCS#30kHz. If the TA command is notified by MAC CE of the TA command, UE2a uses the selected granularity and the notified TA command to calculate the transmission timing adjustment time of the uplink signal. Thus, UE2a can calculate the transmission timing adjustment time of the uplink signal based on the TA command received from gNB1 and the selected granularity.

[0168] exist Fig. 20C In the figure, UE2a sends uplink signals to gNB1 through PCell and three SCells. UE2a sets the SCS of the subcarriers of PCell to SCS#15kHz, and sets the SCS of the subcarriers of SCell to SCS#30kHz, 60kHz, and 30kHz from the left side of the figure.

[0169] exist Fig. 20C In the figure, the PCell and the SCell on the left of the three SCells belong to the same pTAG. Fig. 20C In the case of , the uplink signal of the PCell and the uplink signal of the SCell on the left are controlled by the same TA command. In addition, the SCell in the middle of the three SCells and the SCell on the right belong to the same sTAG. Fig. 20C In this case, the uplink signal of the center SCell and the uplink signal of the right SCell are sent at a timing controlled based on the same TA command (TAcommand).

[0170] UE2a refers to storage unit 27 to obtain the granularity corresponding to SCS#15kHz and the granularity corresponding to SCS#30kHz belonging to pTAG. UE2a selects the smallest granularity among the obtained granularities. Fig. 20C In this case, UE2a selects the granularity corresponding to SCS#30kHz. If the TA command is notified by MAC CE of the TA command, UE2a uses the selected granularity and the notified TA command to calculate the transmission timing adjustment time of the uplink signal. Thus, UE2a can calculate the transmission timing adjustment time of the uplink signal of pTAG based on the TA command received from gNB1 and the selected granularity.

[0171] In addition, UE2a refers to storage unit 27 to obtain the granularity corresponding to SCS#60kHz and the granularity corresponding to SCS#30kHz belonging to sTAG. UE2a selects the smallest granularity among the obtained granularities. Fig. 20C In this case, UE2a selects the granularity corresponding to SCS#60kHz. If the TA command is notified by MAC CE of the TA command, UE2a uses the selected granularity and the notified TA command to calculate the transmission timing adjustment time of the uplink signal. Thus, UE2a can calculate the transmission timing adjustment time of the uplink signal of sTAG based on the TA command received from gNB1 and the selected granularity.

[0172] In addition, Fig. 20C In the embodiment, the smallest granularity is selected in pTAG and sTAG respectively, but the smallest granularity can also be selected in pTAG and sTAG as a whole. In addition, the cell or BWP in the deactivated state can also be ignored. In addition, in the above, UE2a is described, but the same is true for UE2b.

[0173] In addition, the "minimum granularity" of the storage unit 27 can also be changed according to the setting changes in the higher layers such as the RRC layer (for example, RRC connection reconfiguration). At this time, UE2a, 2b can select a granularity from the granularities that include the "minimum granularity" from the timing of receiving the change indication. In addition, the granularity can also be selected from the granularities that include the "minimum granularity" from the timing of sending a confirmation response (L1-ACK or L2-ACK (for example, RLC-ACK) or L3 ACK (for example, RRC connection reconfiguration complete (RRC connection reconfigruation complete))) for the change indication (or, further from the timing of receiving a confirmation response thereto).

[0174] As described above, UE2a and 2b receive a TA command MAC CE containing a TA command for an uplink signal from gNB1. UE2a and 2b obtain the granularity corresponding to the SCS applied to the uplink signal from a storage unit that associates the SCS applicable to the uplink signal with the TA command. UE2a and 2b select the smallest granularity among the obtained granularities. UE2a and 2b calculate the transmission timing adjustment time of the uplink signal based on the value obtained by multiplying the TA command received from gNB1 and the selected smallest granularity. Then, UE2a and 2b adjust the transmission timing of the uplink signal based on the transmission timing adjustment time and send it to gNB1.

[0175] This allows UE2a and UE2b to appropriately perform transmission timing control of uplink signals to which a plurality of parameter sets are applied. In addition, the wireless communication system can dynamically change the TA command and suppress data transmission overhead.

[0176] (Variant 1)

[0177] UE2a, 2b may also determine the granularity based on the QoS or priority of the data associated with the logical channel or SCS (parameter set). For example, in the MAC layer, it is specified that the logical channel and SCS are associated based on the signal of the RRC layer. Therefore, UE2a, 2b may also determine the granularity to be applied based on the QoS or priority of the data associated with the logical channel or SCS.

[0178] This allows UE2a and UE2b to appropriately perform transmission timing control of uplink signals to which a plurality of parameter sets are applied. In addition, the wireless communication system can dynamically change the TA command and suppress data transmission overhead.

[0179] (Variant 2)

[0180] UE2a and 2b may also use the granularity of the SCS of the uplink signal with high transmission frequency. For example, UE2a and 2b may also measure the transmission frequency of the uplink signal in each SCS and use the granularity of the SCS with high frequency.

[0181] As a result, UE2a and 2b can appropriately control the transmission timing of uplink signals to which multiple parameter sets are applied. In addition, the wireless communication system can dynamically change the TA command and suppress the overhead of data transmission. In addition, UE2a and 2b can calculate the transmission timing adjustment time of the uplink signal using the granularity corresponding to the frequency of the SCS.

[0182] In the above, each embodiment is described. In the above, the granularity is selected based on the SCS (with the SCS as a key), but the granularity may also be selected based on the OFDM symbol length.

[0183] (Simultaneous notification of multiple TA commands to UE)

[0184] UE2a is sometimes notified of 2 TA commands from gNB1 at the same time. For example, in the TA command MAC CE, 2 SCS IDs and 2 TA commands corresponding to the 2 SCS IDs are sometimes stored. At this time, UE2a receives 2 SCS IDs and 2 TA commands from gNB1 at the same time.

[0185] When two TA commands are received at the same time, the granularities of the two TA commands may be different. UE2a may perform any of the following processes when the granularities of the TA commands are different.

[0186] 1.UE2a selects a smaller granularity from the two granularities. Then, UE2a applies the selected smaller granularity to the two TA commands (TAcommand) notified from gNB1 to control the transmission timing of the uplink signal. In addition, UE2a can also discard the granularity that is not selected.

[0187] 2. UE2a applies the corresponding granularity to the two TA commands respectively, thereby controlling the transmission timing of the uplink signal. Alternatively, UE2a applies one of the two granularities to the two TA commands respectively, thereby controlling the transmission timing of the uplink signal.

[0188] 3. UE2a discards 2 granularities.

[0189] In addition, in the above, it is assumed that one TA command (TA command) MAC CE contains two SCS IDs and two TA commands (TA command), but UE2a can also simultaneously receive two TA command (TA command) MAC CEs containing one SCS ID and one TA command (TA command).

[0190] In addition, in the above description, it is assumed that the TA command MAC CE includes 2 SCS IDs and 2 TA commands, but the present invention is not limited thereto. The TA command MAC CE may also include 3 or more SCS IDs and 3 or more TA commands.

[0191] In addition, UE2a may also notify gNB1 of information on the adopted (selected) granularity or information on the discarded granularity (e.g., ACK. / NACK, etc.). In the above, UE2a is described, but the same is true for UE2b.

[0192] (UE does not support some SCS)

[0193] UE2a and 2b sometimes do not support part of the existing multiple SCSs. For example, UE2a and 2b sometimes do not support SCS#120kHz among SCS#15kHz, 30kHz, 60kHz, and 120kHz, or do not support SCS#60kHz and 120kHz. When receiving a control signal (MAC CE or RRC signal, etc.) for specifying an unsupported SCS, UE2a and 2b may also discard the control signal. In addition, UE2a and 2b may also notify gNB1 that the control signal has been discarded.

[0194] (When the granularity required for sending timing control is not specified)

[0195] The NW may not specify to UE2a and 2b that an SCS with a finer granularity than that specified by the NW is required. That is, even if a TA command with a coarser granularity than the SCS actually applied or set is specified, UE2a and 2b can operate appropriately.

[0196] (Hardware Structure)

[0197] In the description of the above-mentioned embodiments, blocks of functional units are represented by block diagrams. These functional blocks (structural units) are implemented by any combination of hardware and / or software. In addition, the implementation means of each functional block is not particularly limited. That is, each functional block can be implemented by one device that is physically and / or logically combined, or two or more devices that are physically and / or logically separated can be directly and / or indirectly (for example, wired and / or wireless) connected and implemented by these multiple devices.

[0198] For example, gNB1, UE2a, 2b, etc. in one embodiment of the present invention can function as a computer that processes the wireless communication method of the present invention. Fig.21 This is a diagram showing an example of the hardware structure of gNB1 and UE2a, 2b involved in one embodiment of the present invention. The above-mentioned gNB1 and UE2a, 2b can be physically constituted as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0199] In addition, in the following description, the word "device" can be replaced by circuit, equipment, unit, etc. The hardware structure of gNB1 and UE2a, 2b can be composed of one or more of the devices shown in the figure, or it can be composed without including some of the devices.

[0200] As for each function in gNB1 and UE2a, 2b, for example, it is achieved by reading the specified software (program) on hardware such as processor 1001 and memory 1002, performing calculations through processor 1001, and controlling the communication of communication device 1004, or controlling the reading and / or writing of data in memory 1002 and storage 1003.

[0201] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, the timing control unit 25 of UE2a, 2b may also be implemented by the processor 1001.

[0202] In addition, the processor 1001 reads the program (program code), software module or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that enables a computer to perform at least a part of the operations described in the above embodiments is used. For example, the functions of UE2a, 2b can be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the other functional blocks can also be implemented in the same way. The above-mentioned various processes are described as being executed by one processor 1001, but can also be executed by more than two processors 1001 simultaneously or successively. The processor 1001 can also be implemented by more than one chip. In addition, the program can also be sent from the network via an electrical communication line.

[0203] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method of one embodiment of the present invention.

[0204] The storage 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (such as a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (such as a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may also be, for example, a database, a server, and other appropriate media including the memory 1002 and / or the storage 1003.

[0205] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via a wired and / or wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. For example, the downlink signal sending unit 11, the uplink signal receiving unit 12, the uplink signal sending unit 21, the downlink signal receiving unit 22, etc. mentioned above can also be implemented by the communication device 1004.

[0206] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0207] In addition, each device such as the processor 1001 and the memory 1002 is connected via a bus 1007 for performing information communication. The bus 1007 may be composed of a single bus or different buses between devices.

[0208] In addition, gNB1 and UE2a, 2b may include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and may also implement part or all of each functional block through the hardware. For example, processor 1001 may be implemented by at least one of these hardware.

[0209] (Information notification, signaling)

[0210] The notification of information is not limited to the method / implementation method described in this specification, and may also be performed by other methods. For example, the notification of information may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high-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. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, and the like.

[0211] (Applicable system)

[0212] The various methods / implementations described in this specification can be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and systems utilizing other appropriate systems and / or next-generation systems expanded based on them.

[0213] (Processing process, etc.)

[0214] The processing procedures, timings, flow charts, etc. of each method / implementation described in this specification may be reversed in order as long as there is no contradiction. For example, regarding the method described in this specification, the elements of various steps are presented in the order of illustration, and are not limited to the specific order presented.

[0215] (Base Station Operation)

[0216] In this specification, a specific operation is assumed to be performed by a base station, and sometimes it is also performed by its upper node according to the situation. In a network composed of one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by a base station and / or other network nodes other than the base station (for example, consider MME or S-GW, etc., but not limited to this). The above example illustrates the case where there is one other network node other than the base station, but it can also be a combination of multiple other network nodes (for example, MME and S-GW).

[0217] (Direction of input and output)

[0218] Information, etc. (refer to the section "information, signals, etc.") can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or can be input and output via a plurality of network nodes.

[0219] (Processing of input and output information, etc.)

[0220] The input and output information may be stored in a specific area (e.g., a memory) or managed by a management table. The input and output information may be overwritten, updated, or added. The output information may be deleted. The input information may be sent to other devices.

[0221] (Judgment method)

[0222] The determination may be made using a value represented by 1 bit (0 or 1), a true or false value (Boolean: true or false), or a comparison of numerical values ​​(for example, comparison with a predetermined value).

[0223] (Deformation of method, etc.)

[0224] Each method / implementation method described in this specification may be used alone or in combination, or may be switched during execution. In addition, notification of specified information (e.g., notification of "is X") is not limited to being performed explicitly, but may also be performed implicitly (e.g., by not notifying the specified information).

[0225] The present invention has been described in detail above, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as a modification and variation without departing from the purpose and scope of the present invention as determined by the description of the claims. Therefore, the description of this specification is for the purpose of illustration and does not have any restrictive meaning to the present invention.

[0226] (software)

[0227] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be construed broadly to mean instructions, instruction sets, codes, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, procedures, functions, etc.

[0228] In addition, software, instructions, etc. may be sent and received via transmission media. For example, where the software is sent from a website, server, or other remote source using wired technologies such as coaxial cable, fiber optic cable, twisted pair, and digital subscriber line (DSL), and / or wireless technologies such as infrared, wireless, and microwave, these wired technologies and / or wireless technologies are included in the definition of transmission media.

[0229] (Information, signal)

[0230] Information, signals, etc. described in this specification may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, code elements, and chips mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0231] In addition, the terms described in this specification and / or the terms required for understanding this specification can be replaced with terms having the same or similar meanings. For example, a channel and / or a code element can also be a signal. In addition, a signal can also be a message. In addition, a component carrier (CC) can also be referred to as a carrier frequency, a cell, etc.

[0232] (“System”, “Network”)

[0233] The terms "system" and "network" used in this specification are used interchangeably.

[0234] (parameters, channel name)

[0235] In addition, the information, parameters, etc. described in this specification may be represented by absolute values, relative values ​​relative to a specified value, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0236] The names used for the above parameters are not limiting in any way. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in this specification. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements (e.g., TPC, etc.) can be identified by all appropriate names, so the various names assigned to these various channels and information elements are not limiting in any way.

[0237] (Base Station)

[0238] A base station can accommodate one or more (for example, three) cells (also called sectors). 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 also provide communication services through a base station subsystem (for example, a small base station for indoor use, namely a remote radio head (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​a base station and / or a base station subsystem that provides communication services within the coverage area. Furthermore, terms such as "base station", "eNB", "cell", and "sector" can be used interchangeably in this specification. Base stations are sometimes also referred to as fixed stations, NodeB, eNodeB (eNB), access points, micro-micro cells, small cells, and other terms.

[0239] (Mobile Station)

[0240] A mobile station is also sometimes referred to by those skilled in the art as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handheld device, a user agent, a mobile client, a client or some other appropriate terminology.

[0241] (Meaning and explanation of terms)

[0242] The terms "determining" and "determining" used in this specification sometimes include a variety of operations. "Determining" and "determining" may include, for example, situations where judging, calculating, computing, processing, deriving, investigating, looking up (for example, searching in a table, database or other data structure), and ascertaining are considered to be "determining" and "determining". In addition, "determining" and "determining" may include situations where receiving (for example, receiving information), transmitting (for example, transmitting information), inputting, outputting, accessing (for example, accessing data in a memory) are considered to be "determining" and "determining". In addition, "determining" and "determining" may include situations where resolving, selecting, choosing, establishing, comparing, etc. are considered to be "determining" and "determining". That is, "determining" and "determining" may include situations where any operation is considered to be "determining" and "determining".

[0243] The terms "connected", "coupled", or all variations thereof, mean all connections or couplings, direct or indirect, between two or more elements, and can include situations where there are one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. As used in this specification, two elements can be considered to be "connected" or "coupled" to each other by using one or more wires, cables and / or printed electrical connections, and as several non-limiting and non-inclusive examples, they can be "connected" or "coupled" to each other by using electromagnetic energy such as electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, and optical (both visible and invisible) region.

[0244] The reference signal can be referred to as RS (Reference Signal), or as a pilot signal according to the applicable standard. In addition, the correction RS may also be referred to as TRS (Tracking RS), PC-RS (Phase Compensation RS), PTRS (Phase Tracking RS), or Additional RS. In addition, the demodulation RS and the correction RS may also be referred to by other names corresponding to them. In addition, the demodulation RS and the correction RS may also be defined as the same name (e.g., demodulation RS).

[0245] The phrase “based on” used in this specification does not mean “based only on” unless otherwise explicitly stated in other paragraphs. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0246] The "unit" in the structure of each of the above-mentioned devices may be replaced with a "component", "circuit", "device" or the like.

[0247] As long as the terms "including", "comprising" and their variations are used in this specification or claims, they are used in a comprehensive manner, similar to the term "having". Furthermore, the term "or" used in this specification or claims does not mean a logical exclusive OR.

[0248] A wireless frame may also be composed of one or more frames in the time domain. One or more frames in the time domain may also be referred to as a subframe, a time unit, etc. A subframe may also be further composed of one or more time slots in the time domain. A time slot may also be further composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbols, etc.) in the time domain.

[0249] A radio frame, a subframe, a time slot, and a symbol all represent time units when transmitting a signal. A radio frame, a subframe, a time slot, and a symbol may also be other names corresponding to them.

[0250] For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each mobile station) to each mobile station. The minimum time unit of scheduling may also be called TTI (Transmission Time Interval).

[0251] For example, one subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, or one time slot may be referred to as a TTI.

[0252] A resource unit is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers in the frequency domain. In addition, a resource unit may include one or more symbols in the time domain, or may be the length of one time slot, one subframe, or one TTI. One TTI and one subframe may also be composed of one or more resource units, respectively. In addition, a resource unit may also be referred to as a resource block (RB), a physical resource block (PRB), a PRB pair, an RB pair, a scheduling unit, a frequency unit, or a subband. In addition, a resource unit may also be composed of one or more REs. For example, one RE may be a resource unit that is smaller than the resource unit that is the resource allocation unit (for example, the smallest resource unit), and is not limited to the name RE.

[0253] The above-mentioned radio frame structure is merely an example, and the number of subframes included in a radio frame, the number of time slots included in a subframe, the number of symbols and resource blocks included in a time slot, and the number of subcarriers included in a resource block can be variously changed.

[0254] Throughout this disclosure, where articles such as a, an, and the in English are added due to translation, for example, these articles are intended to include a plurality unless clearly denied by the context.

[0255] (Deformation of method, etc.)

[0256] Each method / implementation method described in this specification may be used alone or in combination, or may be switched during execution. In addition, notification of specified information (e.g., notification of "is X") is not limited to being performed explicitly, but may also be performed implicitly (e.g., by not notifying the specified information).

[0257] The present invention has been described in detail above, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as a modification and variation without departing from the purpose and scope of the present invention as determined by the description of the claims. Therefore, the description of this specification is for the purpose of illustration and does not have any restrictive meaning to the present invention.

[0258] Industrial Applicability

[0259] One aspect of the present invention is useful for a mobile communication system.

[0260] Description of symbols

[0261] 1 gNB

[0262] 2a, 2b UE

[0263] C1 Community

[0264] 11 Downlink signal sending unit

[0265] 12 Uplink signal receiving unit

[0266] 13 Received signal demodulation unit

[0267] 14 Measuring units

[0268] 15 CC Snap-in

[0269] 16 TAG decision unit

[0270] 17 Downlink signal generation unit

[0271] 21 Uplink signal sending unit

[0272] 22 Downlink signal receiving unit

[0273] 23 Received signal demodulation unit

[0274] 24 measuring units

[0275] 25 Timing control unit

[0276] 26 Uplink signal generation unit

[0277] 31, 32 MAC PDU

Claims

1. A terminal comprising: a control unit that adjusts the uplink transmission timing based on a granularity associated with a maximum subcarrier spacing among granularities associated with subcarrier spacings of a plurality of uplink bandwidth parts in the same timing advance group and the timing advance command; and a sending unit, performing uplink sending according to the uplink sending timing, The larger the subcarrier spacing of the uplink bandwidth part, the smaller the granularity associated with the subcarrier spacing of the uplink bandwidth part. The control unit adjusts the uplink transmission timing using a value obtained by multiplying the timing advance command by a granularity associated with the maximum subcarrier spacing.

2. The terminal according to claim 1, wherein: The multiple uplink bandwidth parts are within two uplink carriers of the serving cell.

3. The terminal according to claim 1 or claim 2, wherein: A granularity associated with the maximum subcarrier spacing is smaller than a granularity associated with a subcarrier spacing smaller than the maximum subcarrier spacing.

4. A sending method of a terminal, The terminal performs the following operations: adjusting the uplink transmission timing based on a granularity associated with a maximum subcarrier spacing among granularities associated with subcarrier spacings of a plurality of uplink bandwidth parts within the same timing advance group and the timing advance command; and Perform uplink transmission according to the uplink transmission timing, The larger the subcarrier spacing of the uplink bandwidth part, the smaller the granularity associated with the subcarrier spacing of the uplink bandwidth part. The adjusting of the uplink transmission timing is to adjust the uplink transmission timing by using a value obtained by multiplying the timing advance command by a granularity associated with the maximum subcarrier spacing.

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