Terminal and communication method

Abstract

This terminal comprises: a control unit that assumes that a synchronization signal block is transmitted from a base station at a period longer than a predetermined period at the time of initial access; and a reception unit that receives the synchronization signal block.

Description

[Technical Field]

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

[0002] For NR (New Radio) (also known as "5G"), the successor system to LTE (Long Term Evolution), technologies that satisfy requirements such as a large-capacity system, high-speed data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and low power consumption are being considered (for example, Non-Patent Document 1).

[0003] NR Release 18 considers energy saving specifications for base stations, with details being left for further study. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.300 V16.8.0 (2021-12) Summary of the Invention [Problem to be solved by the invention]

[0005] To achieve carbon neutrality and the SDGs, it is becoming increasingly important to reduce the power consumption of base stations. However, there is no standardized and suitable method for reducing the power consumption of base stations in conventional technologies.

[0006] The present invention has been made in view of the above points, and has an object to provide a technique for realizing a reduction in power consumption of a base station in a wireless communication system. [Means for solving the problem]

[0007] According to the disclosed technology, at the time of initial access, a synchronization signal block is transmitted at a predetermined period. is 20ms a control unit that assumes that the signal is transmitted from the base station at a period longer than a receiving unit that receives the synchronization signal block; A terminal, When the control unit detects that the spare of the MIB included in at least one synchronization signal block has a specific value, it assumes that the synchronization signal block is being transmitted from the base station at a period longer than the predetermined period. A terminal is provided. [Effects of the Invention]

[0008] The disclosed technology provides a technology for realizing a reduction in power consumption of a base station in a wireless communication system. [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] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 3] FIG. 1 is a diagram illustrating each piece of information in the PBCH and its role. [Figure 4] FIG. 1 is a diagram illustrating the contents of the PBCH. [Figure 5] FIG. 10 is a diagram illustrating an example of the period of SSB. [Figure 6] FIG. 10 is a diagram for explaining an operation for notifying capability information. [Figure 7] FIG. 1 is a diagram for explaining an overview of an embodiment. [Figure 8] FIG. 10 is a diagram for explaining an outline of an operation using a timer. [Figure 9] FIG. 10 is a diagram for explaining an example of an operation using a timer. [Figure 10] FIG. 10 is a diagram for explaining an outline of an operation using a pause period. [Figure 11] FIG. 10 is a diagram illustrating an example of an operation using a pause period. [Figure 12] FIG. 2 is a diagram illustrating an example of the configuration of a base station 10. [Figure 13]FIG. 2 is a diagram illustrating an example of the configuration of a terminal 20. [Figure 14] 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. [Figure 15] FIG. 1 is a diagram illustrating an example of the configuration of a vehicle. 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] In operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate, for example, existing LTE or existing NR, but is not limited to existing LTE or NR.

[0012] Furthermore, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) used in existing LTE or NR are used. This is for convenience of description, and similar signals, functions, etc. may be referred to by other names. Furthermore, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even signals used in NR are not necessarily designated as "NR-".

[0013] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, when radio parameters and the like are "configured," it may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] Fig. 1 is a diagram showing a configuration example (1) of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the 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.

[0016] 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. The time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is, for example, transmitted via NR-PBCH and is also referred to as broadcast information. The synchronization signal and system information may be referred to as SSB (SS / PBCH block). As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 in the downlink (DL) and receives control signals or data from the terminal 20 in the uplink (UL). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to the DL or UL. In addition, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0017] 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 also receives various reference signals transmitted from the base station 10 and measures the propagation path quality based on the reception results of the reference signals.

[0018] Terminal 20 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (Component Carriers)) to communicate with base station 10. In carrier aggregation, one PCell (Primary cell) and one or more SCells (Secondary cells) are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0019] Fig. 2 is a diagram illustrating an example (2) of a wireless communication system according to an embodiment of the present invention. Fig. 2 shows a configuration example of a wireless communication system in which DC (Dual connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0020] A cell group provided by base station 10A, which is an MN, is called an MCG (Master Cell Group), and a cell group provided by base station 10B, which is an SN, is called an SCG (Secondary Cell Group). In addition, in a DC, an MCG is composed of one PCell and one or more SCells, and an SCG is composed of one PSCell (Primary SCG Cell) and one or more SCells.

[0021] The processing operations in this embodiment may be executed in the system configuration shown in FIG. 1, in the system configuration shown in FIG. 2, or in any other system configuration.

[0022] (Regarding power saving) Next, we will discuss the status of discussions on base station power saving in NR Release 18. Base station and terminal techniques to improve network energy saving from both the base station transmission and reception perspectives are being considered. For example, it is being considered that base stations can use support / feedback and assistance information from terminals to save network energy in one or more of the time, frequency, space, and power domains.

[0023] To achieve carbon neutrality and the SDGs, it is becoming increasingly important to reduce the power consumption of base stations. However, no suitable method for reducing the power consumption of base stations has been proposed until now.

[0024] In particular, in a wireless communication system, periodic downlink (DL) transmissions such as SSBs constantly consume power from the base station 10. Therefore, it is important to reduce the number of SSB transmission occasions in order to reduce the power consumption of the base station 10. However, in the conventional technology, there is a problem in that reducing SSB transmission occasions may cause an unexpected event in the terminal 20, which may cause the terminal 20 (and the base station 10) to be unable to operate properly.

[0025] SSB is an abbreviation for Synchronization Signal Block, and is sometimes called a Synchronization / PBCH block or an SS / PBCH block.

[0026] In the following explanation, a mechanism for solving the above problems will be explained using SSB as an example, but SSB is an example of a DL signal (which may also be called DL information) that is periodically transmitted by base station 10, and the technology described below may also be applied to DL signals other than SSB.

[0027] (Basic operations related to SSB) First, the basic operation related to the SSB (especially its transmission periodicity) in this embodiment will be described. The SSB is used by terminal 20 to measure reception power or reception quality. Furthermore, terminal 20 obtains basic information about a cell by reading information contained in the PBCH in the SSB of that cell. Figure 3 shows the various pieces of information and their roles in the PBCH (MIB) contained in the SSB. Figure 4 shows the contents of the PBCH.

[0028] NR SSBs are basically transmitted periodically within the time resource of the first or second half of a frame (10 ms). Figure 5 shows a case where four SSBs are transmitted in a certain cell (cell A) at a period of X ms. One SSB is, for example, four symbols long, and each SSB starts at a specified position. One SSB includes a PBCH and synchronization signals (PSS, SSS).

[0029] The operation of terminal 20 related to the SSB period can be classified into the following cases 1, 2, and 3. The existence of cases 1 to 3 is also true in the embodiments of the present invention. However, in the present embodiments (first to third embodiments and variations described below), it is assumed that base station 10 can transmit SSB at a period longer than that in conventional technology. The period shown in the explanation of the cases here is the existing period.

[0030] <Case 1: Initial cell selection> At the time of initial cell selection (initial access) in Case 1, terminal 20 assumes that half frames of the SS / PBCH block occur at a two-frame cycle. In other words, at the time of initial access, terminal 20 monitors the SSB assuming that the SSB has a 20 ms cycle.

[0031] <Case 2: From SIB1 reception to RRC connected state> After initial access to a cell, terminal 20 receives SIB1 from that cell and establishes an RRC connection. During this period, the SSB transmission periodicity is notified to terminal 20 by base station 10 using ssb-periodicityServingCell in ServingCellConfigCommonSIB. Terminal 20 monitors the SSB based on the notified periodicity. The periodicity is a required parameter, and a value selected from {ms5, ms10, ms20, ms40, ms80, ms160} is notified to terminal 20 by base station 10.

[0032] <Case 3: During RRC connected state> The SSB periodicity during the RRC connected state is notified from the base station 10 to the terminal 20 by ssb-periodicityServingCell in ServingCellConfigCommon. The notified value is in the range of {ms5, ms10, ms20, ms40, ms80, ms160, spare2, spare1}. If ssb-periodicityServingCell does not exist in ServingCellConfigCommon, the terminal 20 assumes that the SSB periodicity is 5 ms.

[0033] (About capability information notification operations) In this embodiment, in the RRC connected state, the base station 10 can set parameters relating to the SSB period and the like in the terminal 20 based on the capability information of the terminal 20. Fig. 6 shows the basic operation relating to the capability information notification.

[0034] First, in S1, the base station 10 transmits a capability inquiry (UE Capability Enquiry) to the terminal 20. In S2, the terminal 20 transmits capability information (UE Capability Information) to the base station 10.

[0035] (Outline of the embodiment) In this embodiment, the proposed contents will be explained separately for the above-mentioned cases 1, 2, and 3. That is, as shown in FIG. 7, an embodiment in case 1, which corresponds to the time of initial access, will be explained as a first embodiment. Also, an embodiment in case 2, from the reception of SIB1 shown in S101 until the establishment of an RRC connected state, will be explained as a second embodiment. Furthermore, an embodiment in case 3, which corresponds to the period during the RRC connected state, will be explained as a third embodiment. As shown in FIG. 7, in case 3, capability information is notified from the terminal 20 to the base station 10 (S102), and setting information (which may also be called instruction information) is notified from the base station 10 to the terminal 20 (S103).

[0036] Each embodiment will be described below. In each of the following embodiments, it is assumed that the base station 10 can transmit SSBs at a longer period than that in the prior art in order to reduce power consumption. In each of the following embodiments, the operation of the base station 10 and the terminal 20 will be described so that the terminal 20 can properly receive the SSBs even when the base station 10 transmits SSBs at a longer period.

[0037] (First embodiment) In the first embodiment, which is an embodiment for Case 1 (at the time of initial access), the terminal 20 assumes that the period of the SSB transmitted from the base station 10 is X ms, which is longer than a predetermined value (for example, 20 ms). More specifically, the operations related to this assumption include the following Option 1 and Option 2.

[0038] Option 1 is an operation based on the judgment of the terminal 20, and includes the following options 1-1 and 1-2.

[0039] <First embodiment: Option 1-1> In option 1-1, an SSB period longer than the period in the prior art (called an "extended SSB period") is applied only to terminals 20 that support the extended SSB period.

[0040] For example, a terminal 20 that supports an extended SSB periodicity may assume that half-frames with SS / PBCH blocks occur at a periodicity of Y frames, where Y is X / 10. For example, if X=320 ms, then Y is 32.

[0041] Base station 10 transmits SS / PBCH blocks at a cycle of Y frames. At this time, base station 10 assumes that terminals 20 that support an extended SSB cycle will monitor the SSB at that cycle (Y frame cycle). Furthermore, base station 10 assumes that terminals 20 that do not support an extended SSB cycle will monitor the SSB at a cycle of a specific value (for example, 2 frames).

[0042] The value of Y mentioned above may be, for example, a fixed value defined in a specification. The value of Y may be 4, 8, 16, 32, or 64. However, these values ​​are examples, and the value of Y may be a value other than these. Furthermore, the value of Y may differ for each cell (each base station).

[0043] Note that a terminal 20 that supports an extended SSB cycle may be interpreted as a terminal 20 that supports the terminal capability (UE capability) for the extended SSB cycle. Furthermore, the terminal capability (UE capability) may be defined to distinguish between SSB cycles that can be monitored. Note that the terminal capability is reported from the terminal 20 to the base station 10 after initial access.

[0044] <First embodiment: Option 1-2> In Option 1-2, the extended SSB cycle is applied to all terminals 20 (any terminal 20). In Option 1-2, terminal capabilities such as the terminal capabilities (UE capability) in Option 1-1 are not defined.

[0045] Terminal 20 assumes that half frames having SS / PBCH blocks occur in a cycle of Y frames (Y number of frames). Also, some terminals 20 may assume that half frames having SS / PBCH blocks occur in a cycle of two frames.

[0046] <First embodiment: Option 2> In option 2, the terminal 20 operates based on a notification from the base station 10. Specifically, for example, after the terminal 20 receives at least one SSB from the base station 10, if the terminal 20 detects that the spare (spare shown in FIG. 3) of the MIB (PBCH) in the SSB is a specific value (e.g., 1), the terminal 20 assumes that half frames having SS / PBCH blocks occur at a period of Y frames (Y frames). Here, Y is X / 10. For example, if X=320 ms, Y is 32.

[0047] The value of Y may be, for example, a fixed value defined in a specification. The value of Y may be 4, 8, 16, 32, or 64. However, these values ​​are examples, and the value of Y may be a value other than these. Furthermore, the value of Y may differ for each cell (each base station).

[0048] From the viewpoint of the base station 10, when the base station 10 transmits SSBs at a Y frame period, the base station 10 sets the spare bit of the MIB to a specific value.

[0049] In option 2, before the terminal 20 receives an SSB, the terminal 20 monitors the SSB assuming that the SSB period is, for example, 20 ms (that is, the existing period).

[0050] According to the first embodiment described above, when SSBs are transmitted from the base station 10 in an extended SSB cycle, the terminal 20 at the time of initial access can properly receive the SSBs.

[0051] (Second embodiment) Next, a second embodiment in case 2, which is an operation during the period from reception of SIB1 until the RRC connected state is established, will be described.

[0052] In the second embodiment, the base station 10 transmits the ServingCellConfigCommonSIB including a new parameter (for example, ssb-periodicityServingCell-r18) in SIB1.

[0053] Candidates for the period notified by ssb-periodicityServingCell-r18 are, for example, {ms5, ms10, ms20, ms40, ms80, ms160, ms320, ms640}. For example, a base station 10 of a cell that transmits SSBs at a period (e.g., 320 ms) longer than a predetermined value (e.g., the existing value of 160 ms) transmits ssb-periodicityServingCell-r18 with that period set.

[0054] A terminal 20 that receives ssb-periodicityServingCell-r18 with a period longer than a predetermined value (e.g., the existing value of 160 ms) can monitor SSB at a period longer than the predetermined value based on the setting information.

[0055] The base station 10 can operate under the assumption that SSBs are monitored at a period set by the base station 10. For example, the base station 10 can determine that the terminal 20 is not monitoring SSBs at times that do not correspond to SSB transmission timings, and therefore can determine that signals or data other than SSBs are receivable.

[0056] According to the second embodiment described above, when the base station 10 transmits SSBs at a period longer than a predetermined period, the terminal 20 can receive the SSBs appropriately.

[0057] (Third embodiment) In the third embodiment, an operation in case 3, which is a period during the RRC connected state, will be described. Option 1, option 2, and option 3 will be described below.

[0058] <Third embodiment: Option 1> In option 1, the base station 10 can notify the terminal 20 of a period of SSBs to be transmitted (which may be called an "extended SSB period") that is longer than the predetermined period (for example, 160 ms) in the prior art.

[0059] For example, the base station 10 notifies (sets) the SSB periodicity to the terminal 20 by ssb-periodicityServingCell in ServingCellConfigCommon. The base station 10 may also notify (set) the extended SSB periodicity to the terminal 20 by a new parameter (e.g., ssb-periodicityServingCell-r18) in ServingCellConfigCommon.

[0060] For example, a value selected from {ms5, ms10, ms20, ms40, ms80, ms160, ms320, ms640} is set in ssb-periodicityServingCell or ssb-periodicityServingCell-r18. Note that the range of values ​​{ms5, ms10, ms20, ms40, ms80, ms160, ms320, ms640} is an example. A value other than these (for example, a value greater than 640 ms) may be set when the base station 10 sends the period to the terminal. 20 may be notified.

[0061] A terminal 20 that receives an SSB cycle via ssb-periodicityServingCell or ssb-periodicityServingCell-r18 can monitor the SSB at that cycle.

[0062] If there is no field (ssb-periodicityServingCell, ssb-periodicityServingCell-r18) in ServingCellConfigCommon that can notify the extended SSB periodicity, the terminal 20 may assume that the SSB periodicity is a specific value (e.g., 5 ms).

[0063] Furthermore, if the above field does not exist, a terminal 20 that supports an extended SSB periodicity may assume that half frames having SS / PBCH blocks occur at a period of Y frames (Y number of frames). The value of Y may be, for example, a fixed value defined in a specification. The value of Y may be 4, 8, 16, 32, or 64. However, these values ​​are merely examples, and the value of Y may be a value other than these. Furthermore, the value of Y may differ for each cell (each base station).

[0064] A terminal 20 that receives ssb-periodicityServingCell-r18 with a period longer than a predetermined value (e.g., the existing value of 160 ms) can monitor SSB at a period longer than the predetermined value based on the setting information.

[0065] The base station 10 can operate under the assumption that SSBs are monitored at a period set by the base station 10. For example, the base station 10 can determine that the terminal 20 is not monitoring SSBs at times that do not correspond to SSB transmission timings, and therefore can determine that signals or data other than SSBs are receivable.

[0066] <Third embodiment: Option 2> In option 2 of the third embodiment, the terminal 20 performs an operation using a timer. The basic operation will be described with reference to FIG.

[0067] In S201, a certain timer value is set (or notified) from the base station 10 to the terminal 20. In S202, the terminal 20 performs an operation related to SSB monitoring based on the state (operating, expired, etc.) of the timer that has that timer value as its initial value.

[0068] The timer value may be in units of ms, symbols, slots, subframes, or frames. Other units may also be used as the timer value unit. The setting / notification in S201 of FIG. 8 may be performed by any of RRC, MAC CE, and DCI. The setting / notification in S201 of FIG. 8 may be performed by a combination of any two or three of RRC, MAC CE, and DCI.

[0069] As an example of a combination of the two, for example, the base station 10 sets multiple timer values ​​in RRC to the terminal 20, and notifies the terminal 20 of information specifying one of the multiple timer values ​​in DCI. The terminal 20 uses the timer value specified in the DCI.

[0070] Also, for example, base station 10 may set a timer value in RRC or MAC CE and instruct terminal 20 to start a timer with the timer value as its initial value in MAC CE or DCI. After that, when the timer expires and another start instruction is given, the timer may start from its initial value.

[0071] Also, for example, the notification of the timer value from the base station 10 to the terminal 20 by MAC CE or DCI may be an instruction to start the timer with that value as the initial value.

[0072] As specific examples of the operation of the terminal 20 in option 2, options 2-1 and 2-2 will be described.

[0073] <Third embodiment: Option 2-1> In option 2-1, the terminal 20 does not assume that an SSB will be transmitted from the base station 10 while the timer is running. Even if an SSB period (e.g., ssb-periodicityServingCell in ServingCellConfigCommon) is set by the base station 10, the terminal 20 does not assume that an SSB will be transmitted from the base station 10 while the timer is running. The base station 10 may not transmit an SSB while the timer is running.

[0074] When the timer expires, the terminal 20 assumes that the base station 10 is transmitting an SSB at the SSB period set by the base station 10 (e.g., ssb-periodicityServingCell in ServingCellConfigCommon). Under this assumption, the terminal 20 can monitor the SSB at the set SSB period. If the base station 10 has not set an SSB period, the terminal 20 may assume that the SSB period is a specific value (e.g., 5 ms).

[0075] An example of operation in option 2-1 will be described with reference to Fig. 9. At time A, terminal 20 starts a timer by receiving a timer start instruction from base station 10, and the timer expires at time B. During the period from A to B, terminal 20 assumes that no SSB is transmitted from base station 10. During this period, terminal 20 does not need to perform SSB monitoring operation. Furthermore, base station 10 does not need to transmit SSB during this period. The same applies to periods C to D.

[0076] During the period B to C, the terminal 20 assumes that the base station 10 is transmitting SSBs at the set cycle, and monitors the SSBs.

[0077] Note that the operations of the terminal 20 / base station 10 during the timer operation described above and the operations of the terminal 20 / base station 10 after the timer expires may be reversed. In this case, for example, in the example of Fig. 9, in periods A to B and periods C to D, the terminal 20 assumes that SSBs are being transmitted at the set cycle, and in period B to C, the terminal 20 assumes that SSBs are not being transmitted.

[0078] <Third embodiment: Option 2-2> In option 2-2, while the timer is running, terminal 20 assumes that half a frame of SS / PBCH blocks arrives at a period of Y frames. The value of Y may be, for example, a fixed value defined in the specifications. The value of Y may be 4, 8, 16, 32, or 64. However, these values ​​are examples, and the value of Y may be a value other than these. Furthermore, the value of Y may differ for each cell (each base station).

[0079] When the timer expires, the terminal 20 assumes that the base station 10 is transmitting an SSB at the SSB period set by the base station 10 (e.g., ssb-periodicityServingCell in ServingCellConfigCommon). Under this assumption, the terminal 20 can monitor the SSB at the set SSB period. If the base station 10 has not set an SSB period, the terminal 20 may assume that the SSB period is a specific value (e.g., 5 ms).

[0080] An example of operation in option 2-2 will also be described with reference to Fig. 9. At time A, terminal 20 starts a timer by receiving a timer start instruction from base station 10, and the timer expires at time B. During the period from A to B, terminal 20 assumes that SSBs are being transmitted from base station 10 at a cycle of Y frames, and monitors the SSBs. The same applies to periods C to D.

[0081] During the period B to C, the terminal 20 assumes that the base station 10 is transmitting SSBs at the set cycle, and monitors the SSBs.

[0082] Note that the operation of the terminal 20 / base station 10 during the timer operation described above and the operation of the terminal 20 / base station 10 after the timer expires may be reversed. In this case, for example, in the example of Fig. 9, in periods A to B and periods C to D, the terminal 20 assumes that SSBs are being transmitted at a set cycle, and in period B to C, the terminal 20 assumes that SSBs are being transmitted at a cycle of Y frames.

[0083] <Third embodiment: Option 3> In option 3 of the third embodiment, the base station 10 sets or notifies the terminal 20 of a pause period, and the terminal 20 performs an operation using the pause period. The pause period may be rephrased as any one of an interruption period, a halt period, a temporary suspension period, and a pause period. The basic operation will be described with reference to FIG. 10.

[0084] In S301, a certain value of the idle period is set (or notified) from the base station 10 to the terminal 20. In S302, the terminal 20 performs an operation related to SSB monitoring based on the idle period.

[0085] The unit of the idle period may be any one of ms, symbols, slots, subframes, and frames. Furthermore, a unit other than these may be used as the unit of the idle period. Furthermore, the setting / notification in S301 in Fig. 10 may be performed by any one of RRC, MAC CE, and DCI. Furthermore, the setting / notification in S301 in Fig. 10 may be performed by a combination of any two or three of RRC, MAC CE, and DCI.

[0086] As an example of a combination of the two, the base station 10 sets multiple idle periods in RRC and notifies the terminal 20 of information specifying one of the multiple idle periods in MAC CE or DCI. The terminal 20 uses the specified idle period.

[0087] Also, for example, the base station 10 may set an idle period for the terminal 20 by RRC or MAC CE, and instruct the terminal 20 to start the idle period by MAC CE or DCI.

[0088] Also, for example, the base station 10 may notify the terminal 20 of the idle period by MAC CE or DCI, which may be an instruction to start the idle period.

[0089] As specific examples of the operation of the terminal 20 in option 3, options 3-1 and 3-2 will be described.

[0090] <Third embodiment: Option 3-1> In option 3-1, the terminal 20 does not assume that an SSB will be transmitted from the base station 10 during the idle period. In other words, the terminal 20 does not assume (expect) to monitor or receive an SSB during the idle period. Even if an SSB periodicity (e.g., ssb-periodicityServingCell in ServingCellConfigCommon) is configured by the base station 10, the terminal 20 does not assume that an SSB will be transmitted from the base station 10 during the idle period.

[0091] The base station 10 does not transmit SSBs during the idle period, although there may be cases where the base station 10 transmits SSBs during the idle period.

[0092] After the idle period ends, for example, the terminal 20 assumes that SSBs are being transmitted at a period of a specific value (e.g., 2 frames). Furthermore, after the idle period ends, the terminal 20 may assume that SSBs are being transmitted from the base station 10 at the SSB period set by the base station 10 (e.g., ssb-periodicityServingCell in ServingCellConfigCommon). Under this assumption, the terminal 20 can monitor SSBs at the set SSB period. If the SSB period is not set by the base station 10, the terminal 20 may assume that the SSB period is a specific value (e.g., 5 ms).

[0093] An example of operation in option 3-1 will be described with reference to Fig. 11. At time A, terminal 20 starts a sleep period by receiving a sleep period start instruction from base station 10, and the sleep period ends at time B. During the period from A to B, terminal 20 assumes that no SSB is being transmitted from base station 10. During this period, terminal 20 does not need to perform SSB monitoring operation. Furthermore, base station 10 does not need to transmit SSB during this period. The same applies to periods C to D.

[0094] During the period B to C, the terminal 20 assumes that the base station 10 is transmitting SSBs at set intervals, for example, and monitors the SSBs.

[0095] <Third embodiment: Option 3-2> In option 3-2, terminal 20 assumes that half frames of SS / PBCH blocks arrive at a cycle of Y frames during idle periods. The value of Y may be, for example, a fixed value defined in the specifications. The value of Y may be 4, 8, 16, 32, or 64. However, these values ​​are examples, and the value of Y may be a value other than these. Furthermore, the value of Y may differ for each cell (each base station).

[0096] When the idle period ends, the terminal 20 assumes that the base station 10 is transmitting SSBs at the SSB period set by the base station 10 (e.g., ssb-periodicityServingCell in ServingCellConfigCommon). Under this assumption, the terminal 20 can monitor the SSB at the set SSB period. If the base station 10 has not set an SSB period, the terminal 20 may assume that the SSB period is a specific value (e.g., 5 ms).

[0097] An example of operation in option 3-2 will also be described with reference to Fig. 11. At the time indicated by A, terminal 20 receives a sleep period start instruction from base station 10, thereby starting the sleep period, and at the time indicated by B, the sleep period ends. During the period from A to B, terminal 20 assumes that SSBs are being transmitted from base station 10 at a cycle of Y frames, and monitors the SSBs. The same applies to the periods from C to D.

[0098] During the period B to C, the terminal 20 assumes that the base station 10 is transmitting SSBs at set intervals, for example, and monitors the SSBs.

[0099] According to the third embodiment described above, when there is a period in which the base station 10 does not transmit SSB, or when the base station 10 transmits SSB at a period longer than a predetermined period, the terminal 20 can properly receive SSB.

[0100] (Variation 1) In the first to third embodiments described above, an operation that enables the use of a longer SSB period than in conventional techniques has been described. In this way, in addition to using a longer period (or independently of using a longer period), a shorter transmission time length per SSB period (or fewer SSBs per period) than in conventional techniques may be used. For convenience of explanation, an SSB with a shorter transmission time length per period than in conventional techniques or a fewer number of SSBs than in conventional techniques will be referred to as a shortened SSB. Here, the number of SSBs per shortened SSB period may be one. Furthermore, the time length per shortened SSB period may be less than four symbols.

[0101] In case 1, terminal 20 performs monitoring assuming, for example, that an SSB with a shortened time length / number of SSBs specified in the specifications will be transmitted from base station 10. In case 2, for example, terminal 20 performs monitoring assuming that an SSB with a shortened time length / number of SSBs notified by base station 10 in SIB1 will be transmitted from base station 10. In case 3, for example, terminal 20 performs monitoring assuming that an SSB with a shortened time length / number of SSBs received from base station 10 in an RRC message after RRC connection will be transmitted from base station 10.

[0102] (Variation 2) Variation 2 will be described as an example applicable to any of the first to third embodiments and variation 1.

[0103] The value of Y described in the first to third embodiments may be a value that terminal 20 receives from base station 10. Base station 10 may transmit the value of Y to terminal 20 in any of an RRC message, MAC CE, and DCI.

[0104] Furthermore, "ssb-periodicityServingCell-r18" used in the second and third embodiments is a message (which may also be called an information element, a parameter, etc.) indicating the periodicity of SSB in the serving cell. A message with a name other than "ssb-periodicityServingCell-r18" may be used as this message.

[0105] Which of the multiple operations (options, etc.) described in the first to third embodiments and Variation 1 is to be performed by terminal 20 may be determined by RRC configuration from base station 10 to terminal 20, or may be determined by notification / instruction of MAC CE, DCI, UCI, etc., or may be determined according to the capabilities of terminal 20.

[0106] Furthermore, the capability information (UE capability) shown in the following (1) to (3) may be defined and reported from the terminal 20 to the base station 10.

[0107] (1) Capability information indicating whether or not an extended SSB cycle (a longer SSB cycle than the conventional technology) is supported (2) Capability information indicating whether the timer described in option 2 of the third embodiment is supported (3) Capability information indicating whether or not the pause described in option 3 of the third embodiment is supported

[0108] (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.

[0109] <Base station 10> Fig. 12 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 12, 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. 12 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related 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.

[0110] 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.

[0111] 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.

[0112] 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 control unit 140 also includes a timer function. 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.

[0113] <Terminal 20> Fig. 13 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 13, 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. 13 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0114] 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 220 may receive the PSCCH, PSSCH, PSDCH, or PSBCH from the other terminal 20. The transmitter 210 also includes the antenna port described in this embodiment.

[0115] The setting unit 230 stores various pieces of setting information received from the base station 10 or other terminals by the receiving unit 220 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.

[0116] The control unit 240 controls the terminal 20. The control unit 240 also includes a timer function. The functional unit in the control unit 240 related to signal transmission may be included in the transmission unit 210, and the functional unit in the control unit 240 related to signal reception may be included in the reception unit 220. The transmission unit 210 may also be called a transmitter, and the reception unit 220 may also be called a receiver.

[0117] This embodiment provides at least the terminal, base station, and communication method described in Supplementary Note 1 and Supplementary Note 2 below.

[0118] <Appendix 1> (Additional note 1) a control unit that assumes that a synchronization signal block is transmitted from a base station at a period longer than a predetermined period during initial access; a receiving unit for receiving the synchronization signal block; A terminal comprising: (Additional note 2) The predetermined period is 20 ms. A terminal as described in appendix 1. (Additional note 3) When the control unit detects that at least one synchronization signal block contains a specific value, it assumes that the synchronization signal block is transmitted from the base station at a period longer than the predetermined period. A terminal as described in appendix 1 or 2. (Additional note 4) a control unit that assumes that the synchronization signal block is transmitted from the base station at a period longer than a predetermined period based on setting information received from the base station; a receiving unit for receiving the synchronization signal block; A terminal comprising: (Additional note 5) a transmitter that transmits setting information indicating a period for transmitting synchronization signal blocks to a terminal; a control unit in the terminal that assumes that the synchronization signal block is being received based on the setting information; A base station comprising: (Additional note 6) At the time of initial access, it is assumed that the synchronization signal block is transmitted from the base station at a period longer than a predetermined period, receive the synchronization signal block The communication method implemented by the device.

[0119] Any of the above items 1 to 6 provides a technique for saving power consumption of a base station in a wireless communication system. According to the supplementary item 2, SSB can be monitored at a period longer than the existing period of 20 ms. According to the supplementary item 3, even at the time of initial access, it is possible to know that SSB is being transmitted at a period longer than the predetermined period.

[0120] <Appendix 2> (Additional note 1) a receiver for receiving a timer value from a base station; a control unit that assumes that a synchronization signal block is not transmitted from the base station while the timer having the timer value is running after the timer is started; A terminal comprising: (Additional note 2) After the timer expires, the control unit assumes that the synchronization signal block is being transmitted from the base station at a period set by the base station. A terminal as described in appendix 1. (Additional note 3) a receiver for receiving a timer value from a base station; a control unit that, after a timer having the timer value has started, assumes that a synchronization signal block is being transmitted from the base station at a period longer than a predetermined period while the timer is operating; A terminal comprising: (Additional note 4) a receiver for receiving a value of the idle period from a base station; a control unit that assumes that a synchronization signal block is not being transmitted from a base station during the idle period; A terminal comprising: (Additional note 5) a transmitter for transmitting a timer value to a terminal; a control unit that controls the terminal so that a synchronization signal block is not transmitted while the timer having the timer value is running after the timer has started; A base station comprising: (Additional note 6) receiving a timer value from the base station; After the timer having the timer value is started, it is assumed that no synchronization signal block is transmitted from the base station while the timer is running. The communication method implemented by the device.

[0121] Any of the above items 1 to 6 provides a technique for saving power consumption of a base station in a wireless communication system. According to the above item 2, SSB can be properly received after the timer expires.

[0122] (Hardware configuration) The block diagrams (FIGS. 12 and 13) used in the description of 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 of realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0123] 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.

[0124] 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. 14 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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. 12 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 13 may be implemented by a control program stored in the storage device 1002 and running on 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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).

[0133] 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.

[0134] 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.

[0135] Furthermore, the terminal 20 or the base station 10 may be provided in a vehicle 2001. FIG. 15 shows an example of the configuration of the vehicle 2001. As shown in FIG. 15, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example. The functions of the terminal 20 may be mounted on the communication module 2013.

[0136] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0137] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0138] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0139] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information obtained from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001.

[0140] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as a millimeter-wave radar, a LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0141] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0142] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0143] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and the detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, which are input to the electronic control unit 2010.

[0144] The communication module 2013 receives various information (traffic information, traffic signal information, inter-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0145] (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.

[0146] 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., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or 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.

[0147] 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.

[0148] 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.

[0149] 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).

[0150] The information or signals 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.

[0151] 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.

[0152] 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).

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0158] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0170] 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."

[0171] 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.

[0172] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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."

[0192] 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.

[0193] 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.

[0194] 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."

[0195] 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).

[0196] 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]

[0197] 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 2001 Vehicle 2002 Drive unit 2003 Steering Section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 front wheel 2008 rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air Pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration Sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driving Assistance Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. a control unit that assumes that a synchronization signal block is transmitted from a base station at a period longer than a predetermined period of 20 ms during initial access; a receiving unit for receiving the synchronization signal block, When the control unit detects that spare of MIB included in at least one synchronization signal block has a specific value, it assumes that the synchronization signal block is being transmitted from the base station at a period longer than the predetermined period. Terminal.

2. Assume that, at the time of initial access, the synchronization signal block is transmitted from the base station at a period longer than the predetermined period of 20 ms. A communication method executed by a terminal receiving the synchronization signal block, comprising: When the terminal detects that spare of an MIB included in at least one synchronization signal block has a specific value, the terminal assumes that the synchronization signal block is being transmitted from the base station at a period longer than the predetermined period. Communication method.

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