WO2023199451A1

WO2023199451A1 - Terminal, base station, and communication method

Info

Publication number: WO2023199451A1
Application number: PCT/JP2022/017755
Authority: WO
Inventors: 優元 ▲高▼橋; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2022-04-13
Filing date: 2022-04-13
Publication date: 2023-10-19

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

Terminal, base station, and communication method

The present invention relates to a terminal, a base station, and a communication method in a wireless communication system.

The requirements for NR (New Radio) (also referred to as "5G"), which is the successor system to LTE (Long Term Evolution), are a large capacity system, high data transmission speed, low latency, and the simultaneous use of a large number of terminals. Techniques that satisfy connectivity, low cost, power saving, etc. are being considered (for example, Non-Patent Document 1).

In NR Release 18, energy saving specifications for base stations are being considered. The details are a subject for future consideration.

In order to achieve carbon neutrality and SDGs, it is becoming increasingly important to save power consumption of base stations. However, in the prior art, there is no standardized and appropriate method for saving power consumption of base stations.

The present invention has been made in view of the above points, and an object of the present invention is to provide a technique for realizing power saving of a base station in a wireless communication system.

According to the disclosed technology, at the time of initial access, a control unit assumes that a synchronization signal block is transmitted from a base station at a cycle longer than a predetermined cycle;
A receiving unit that receives the synchronization signal block is provided.

According to the disclosed technology, a technology for realizing power consumption saving of a base station in a wireless communication system is provided.

FIG. 1 is a diagram for explaining a wireless communication system in an embodiment of the present invention. FIG. 1 is a diagram for explaining a wireless communication system in an embodiment of the present invention. FIG. 3 is a diagram showing each piece of information and its role in PBCH. It is a figure showing the content of PBCH. FIG. 3 is a diagram for explaining an example of an SSB cycle. FIG. 6 is a diagram for explaining an operation regarding notification of capability information. FIG. 2 is a diagram for explaining an overview of an embodiment. FIG. 2 is a diagram for explaining an overview of an operation using a timer. FIG. 3 is a diagram for explaining an example of an operation using a timer. FIG. 3 is a diagram for explaining an outline of an operation using a pause period. FIG. 3 is a diagram for explaining an example of an operation using a pause period. 1 is a diagram showing a configuration example of a base station 10. FIG. 2 is a diagram showing a configuration example of a terminal 20. FIG. FIG. 2 is a diagram showing an example of the hardware configuration of a base station 10 or a terminal 20 in an embodiment of the present invention. 1 is a diagram showing an example of the configuration of a vehicle.

Embodiments of the present invention will be described below 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.

Existing technologies are used as appropriate for the operation of the wireless communication system according to the embodiment of the present invention. However, the existing technology is, for example, existing LTE or existing NR, but is not limited to existing LTE or NR.

In addition, in the embodiment of the present invention described below, the SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), and PRACH used in existing LTE or NR will be used. (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel), etc. are used. This is for convenience of description, and signals, functions, etc. similar to these may be referred to by other names. Also, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even if the signal is used for NR, it is not necessarily specified as "NR-".

Further, in the embodiment of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or another method (for example, Flexible Duplex, etc.). This method may also be used.

Furthermore, in the embodiment of the present invention, "configure" the wireless parameters etc. may mean pre-configuring a predetermined value, or may mean that the base station 10 or Wireless parameters notified from the terminal 20 may also be set.

FIG. 1 is a diagram showing a configuration example (1) of a wireless communication system according to an embodiment of the present invention. A wireless communication system according to an embodiment of the present invention includes a base station 10 and a terminal 20, as shown in FIG. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is just an example, and there may be a plurality of each.

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 radio signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. Good too. Base station 10 transmits a synchronization signal and system information to terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. System information is transmitted, for example, on NR-PBCH, and is also referred to as broadcast information. The synchronization signal and system information may be called SSB (SS/PBCH block). As shown in FIG. 1, the base station 10 transmits a control signal or data to the terminal 20 on the DL (Downlink), and receives the control signal or data from the terminal 20 on the UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Further, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Further, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell) and a primary cell (PCell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary SCG cell (PSCell) of another base station 10 using DC (Dual Connectivity).

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 a communication module for M2M (Machine-to-Machine). 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 receiving various types of information provided by the wireless communication system. Use communication services. Furthermore, the terminal 20 receives various reference signals transmitted from the base station 10, and measures the channel quality based on the reception results of the reference signals.

The terminal 20 is capable of performing carrier aggregation in which multiple cells (multiple CCs (Component Carriers)) are bundled to communicate with the base station 10. In carrier aggregation, one PCell (Primary cell) and one or more SCells (Secondary cells) are used. Also, a PUCCH-SCell with PUCCH may be used.

FIG. 2 is a diagram for explaining an example (2) of a wireless communication system according to an embodiment of the present invention. FIG. 2 shows an example of the configuration of a wireless communication system when dual connectivity (DC) 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. Base station 10A and base station 10B are each connected to a core network. Terminal 20 can communicate with both base station 10A and base station 10B.

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

The processing operations in this embodiment may be executed with the system configuration shown in FIG. 1, may be executed with the system configuration shown in FIG. 2, or may be executed with a system configuration other than these.

(About power saving)
Next, the status of discussions regarding power saving of base stations in NR Release 18 will be explained. Base station and terminal techniques to improve network energy savings from both base station transmission and reception perspectives are discussed. For example, it is contemplated that base stations may use support/feedback and assistance information from terminals to provide network energy savings in one or more of the time, frequency, space, and power domains.

In order to achieve carbon neutrality and SDGs, it is becoming increasingly important to save power consumption of base stations. However, conventionally, no suitable method for saving power consumption of a base station has been proposed.

In particular, in a wireless communication system, periodic downlink (DL) transmission such as SSB constantly consumes power of the base station 10. Therefore, in order to reduce power consumption of the base station 10, it is important to reduce SSB transmission occasions. However, in the conventional technology, there is a problem that by reducing SSB transmission opportunities, an unexpected event may occur in the terminal 20, and the terminal 20 (and the base station 10) may not be able to operate properly.

Note that SSB is an abbreviation for Synchronization Signal Block. Further, SSB may be called Synchronization/PBCH block or SS/PBCH block.

In the following explanation, a mechanism for solving the above problem will be explained using SSB as an example. , the technology described below may be applied to DL signals other than SSB.

(About basic operations related to SSB)
First, basic operations related to SSB (particularly its transmission period) in this embodiment will be explained. SSB is used by the terminal 20 to measure received power or received quality. Further, the terminal 20 reads the information included in the PBCH in the SSB of a certain cell to understand the basic information of that cell. FIG. 3 shows each piece of information in the PBCH (MIB) included in the SSB and its role. FIG. 4 shows the contents of PBCH.

NR SSB is basically transmitted periodically within a time resource of the first half or the second half of one frame (10 ms). FIG. 5 is a diagram showing a case where four SSBs are transmitted per cycle in a certain cell (cell A) with a cycle of Xms. One SSB is, for example, four symbols long, and each SSB starts at a defined position. One SSB includes a PBCH and synchronization signals (PSS, SSS).

The operation of the terminal 20 related to the SSB cycle can be classified into Case 1, Case 2, and Case 3 below. The existence of cases 1 to 3 is also the same in the embodiment of the present invention. However, in this embodiment (first to third embodiments and variations to be described later), it is assumed that the base station 10 can transmit SSB at a cycle longer than the cycle in the conventional technology. The cycles shown in the case description here are existing cycles.

<Case 1: Initial cell selection>
At the time of initial cell selection (initial access) in case 1, the terminal 20 assumes that half frames of the SS/PBCH block occur at a cycle of two frames. That is, at the time of initial access, the terminal 20 monitors the SSB assuming that the SSB has a cycle of 20 ms.

<Case 2: From SIB1 reception to RRC connection status>
After initial access to a certain cell, the terminal 20 receives SIB1 in that cell and establishes an RRC connection. During this period, the SSB transmission cycle is notified from the base station 10 to the terminal 20 by ssb-periodicityServingCell in ServingCellConfigCommonSIB. The terminal 20 monitors the SSB based on the notified cycle. As for the period, a value selected from {ms5, ms10, ms20, ms40, ms80, ms160} is notified from the base station 10 to the terminal 20 as an essential parameter.

<Case 3: During RRC connection state>
The SSB period during the RRC connection state is notified from the base station 10 to the terminal 20 by ssb-periodicityServingCell in ServingCellConfigCommon. The values to be notified are 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 period is 5 ms.

(About ability information notification operation)
In the present embodiment, in the RRC connected state, the base station 10 can set parameters related to the SSB cycle and the like in the terminal 20 based on the capability information of the terminal 20. FIG. 6 shows the basic operation regarding notification of capability information.

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

(Summary of embodiment)
In this embodiment, the contents of the proposal will be explained in case 1, case 2, and case 3 described above. That is, as shown in FIG. 7, the embodiment in case 1 corresponding to the initial access will be described as the first embodiment. Further, an embodiment in case 2 from SIB1 reception shown in S101 to an RRC connection state will be described as a second embodiment. Further, an embodiment in case 3 corresponding to the RRC connection state will be described as a third embodiment. As shown in FIG. 7, in case 3, the terminal 20 notifies the base station 10 of capability information (S102), and the base station 10 notifies the terminal 20 of setting information (which may also be called instruction information). S103) is performed.

Each embodiment will be described below. In any of the embodiments below, it is assumed that the base station 10 can transmit SSB at a longer cycle than the cycle in the conventional technology in order to reduce power consumption. In each of the embodiments below, operations of the base station 10 and the terminal 20 for the terminal 20 to appropriately receive the SSB even when the base station 10 transmits the SSB in a long period will be described.

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

Option 1 is an operation based on the judgment of the terminal 20, and there are Option 1-1 and Option 1-2 below.

<First embodiment: Option 1-1>
In option 1-1, an SSB cycle longer than the cycle in the prior art (this is referred to as an "extended SSB cycle") is applied only to terminals 20 that support the extended SSB cycle.

For example, a terminal 20 that supports extended SSB cycles may assume that a half frame with SS/PBCH blocks occurs in a cycle of Y frames (Y frames). Here, Y is X/10. For example, if X=320ms, then Y is 32.

The base station 10 transmits SS/PBCH blocks at a cycle of Y frames. At this time, the base station 10 assumes that the terminal 20 that supports the extended SSB cycle monitors SSB at that cycle (Y frame cycle). Furthermore, the base station 10 assumes that the terminal 20 that does not support the extended SSB cycle monitors SSB at a cycle of a specific value (for example, 2 frames).

The value of Y mentioned above may be a fixed value defined in the specifications, for example. 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 values. Further, the value of Y may be different for each cell (each base station).

Note that the terminal 20 that supports the extended SSB cycle may be interpreted as the terminal 20 that supports the terminal capability (UE capability) for the extended SSB cycle. Further, the terminal capability (UE capability) may be defined to distinguish the 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.

<First embodiment: Option 1-2>
In option 1-2, the extended SSB period is applied to all terminals 20 (any terminal 20). Option 1-2 does not define a terminal capability like the UE capability in option 1-1.

The terminal 20 assumes that a half frame with SS/PBCH blocks occurs at a period of Y frames (Y frames). Further, there may be a terminal 20 that assumes that a half frame having SS/PBCH blocks occurs at a cycle of two frames.

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

The value of Y may be a fixed value defined in the specifications, for example. 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 values. Further, the value of Y may be different for each cell (each base station).

From the perspective of the base station 10, when the base station 10 transmits SSB at Y frame intervals, the base station 10 sets the spare bit of the MIB to a specific value.

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

According to the first embodiment described above, when SSB is transmitted from the base station 10 in the extended SSB cycle, the terminal 20 at the time of initial access can appropriately receive the SSB.

(Second embodiment)
Next, a second embodiment in case 2, which is the operation during the period from receiving SIB1 to entering the RRC connection state, will be described.

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

The period candidates notified by ssb-periodicityServingCell-r18 are, for example, {ms5, ms10, ms20, ms40, ms80, ms160, ms320, ms640}. For example, the base station 10 of a cell that transmits SSB at a cycle (eg, 320 ms) that is longer than a predetermined value (eg, the existing value of 160 ms) transmits ssb-periodicityServingCell-r18 with the cycle set.

The terminal 20 that receives ssb-periodicityServingCell-r18 with a period longer than a predetermined value (e.g., the existing value of 160ms) monitors SSB with a period longer than the predetermined value based on the setting information. It can be performed.

The base station 10 can operate assuming that SSB will be monitored at a period set by itself. For example, the base station 10 can determine that the terminal 20 can receive signals or data other than SSB because the terminal 20 does not monitor SSB at a timing that does not correspond to the SSB transmission timing.

According to the second embodiment described above, when SSB is transmitted from the base station 10 at a cycle longer than a predetermined cycle, the terminal 20 can appropriately receive the SSB.

(Third embodiment)
In the third embodiment, the operation in case 3, which is the period of the RRC connection state, will be described. Option 1, Option 2, and Option 3 will be explained below.

<Third embodiment: Option 1>
In option 1, the base station 10 notifies the terminal 20 of a cycle (which may also be called an "extended SSB cycle") that is longer than the predetermined cycle (e.g. 160ms) in the conventional technology as the SSB cycle to be transmitted. can do.

For example, the base station 10 notifies (sets) the SSB period to the terminal 20 using ssb-periodicityServingCell in ServingCellConfigCommon. Furthermore, the base station 10 may notify (set) the extended SSB period to the terminal 20 using a new parameter (eg, ssb-periodicityServingCell-r18) in ServingCellConfigCommon.

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

The terminal 20 that receives the SSB cycle through ssb-periodicityServingCell or ssb-periodicityServingCell-r18 can monitor SSB at that cycle.

If there is no field (ssb-periodicityServingCell, ssb-periodicityServingCell-r18) that can notify the extended SSB cycle in ServingCellConfigCommon, the terminal 20 assumes that the SSB cycle is a specific value (e.g. 5ms). You may.

Furthermore, in the case where the above field does not exist, the terminal 20 supporting the extended SSB cycle may assume that a half frame having SS/PBCH blocks occurs at a cycle of Y frames (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 values. Further, the value of Y may be different for each cell (each base station).

<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 explained with reference to FIG.

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 operations related to SSB monitoring based on the state (in operation, expiration, etc.) of a timer that has the timer value as an initial value.

The unit of the timer value may be any one of ms, symbol, slot, subframe, and frame. Further, units other than these may be used as the unit of the timer value. Further, the setting/notification in S201 of FIG. 8 may be performed by any one of RRC, MAC CE, and DCI. Further, 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.

As an example of a combination of the two, for example, the base station 10 sets a plurality of timer values in RRC and notifies the terminal 20 of information specifying any one of the plurality of timer values in DCI. . The terminal 20 uses the timer value instructed by the DCI.

Further, for example, the base station 10 may set a timer value to the terminal 20 using RRC or MAC CE, and may instruct the terminal 20 to activate a timer having the timer value as an initial value using MAC CE or DCI. After that, when the timer expires and there is a restart instruction, the timer may be started from the initial value.

Furthermore, for example, notifying the terminal 20 from the base station 10 of a timer value using MAC CE or DCI may be an instruction to start a timer using that value as an initial value.

Option 2-1 and Option 2-2 will be explained as specific operation examples of the terminal 20 in Option 2.

<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 the terminal 20 is configured with an SSB period (e.g. ssb-periodicityServingCell in ServingCellConfigCommon) from the base station 10, SSB is not transmitted from the base station 10 while the timer is running. not assumed. The base station 10 may not transmit the SSB while the timer is operating.

When the timer expires, the terminal 20 assumes that SSB is being transmitted from the base station 10 according to the SSB period set by the base station 10 (eg, ssb-periodicityServingCell in ServingCellConfigCommon). Under this assumption, the terminal 20 can monitor SSB at the set SSB cycle. If the SSB cycle is not set by the base station 10, the terminal 20 may assume that the SSB cycle is a specific value (for example, 5 ms).

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

During periods B to C, the terminal 20 assumes that SSB is being transmitted from the base station 10 at the set period and monitors the SSB.

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, the terminal 20 assumes that SSB is transmitted at the set period in the period A to B and the period C to D, and in the period B to C. , the terminal 20 assumes that no SSB is being transmitted.

<Third Embodiment: Option 2-2>
In option 2-2, the terminal 20 assumes that half a frame of SS/PBCH blocks arrives at a period of Y frames while the timer is running. 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 values. Further, the value of Y may be different for each cell (each base station).

An example of the operation in option 2-2 will also be explained with reference to FIG. At a time point indicated by A, the terminal 20 starts the timer by receiving a timer start instruction from the base station 10, and at a time point indicated by B, the timer expires. During the period A to B, the terminal 20 assumes that the base station 10 is transmitting SSB at a cycle of Y frames, and monitors the SSB. The same applies to the periods C to D.

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, the terminal 20 assumes that SSB is transmitted at the set period in the period A to B and the period C to D, and in the period B to C. , the terminal 20 assumes that SSB is transmitted at a cycle of Y frames.

<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 operations using the pause period. The rest period may be replaced with any one of a suspension period, a discontinuation period, a pause period, and a pause period. The basic operation will be explained with reference to FIG.

In S301, the base station 10 sets (or notifies) the terminal 20 of a certain idle period value. In S302, the terminal 20 performs operations related to SSB monitoring based on the dormant period.

The unit of the pause period may be any one of ms, symbol, slot, subframe, and frame. Further, units other than these may be used as the unit of the pause period. Further, the setting/notification in S301 of FIG. 10 may be performed by any one of RRC, MAC CE, and DCI. Further, the setting/notification in S301 of FIG. 10 may be performed by a combination of any two or three of RRC, MAC CE, and DCI.

As an example of a combination of the two, for example, the base station 10 sets multiple dormant periods for the terminal 20 using RRC, and provides information specifying any one of the multiple dormant periods using MAC CE or DCI. Notify. Terminal 20 uses the instructed rest period.

Furthermore, for example, the base station 10 may set a dormant period for the terminal 20 using RRC or MAC CE, and may instruct the terminal 20 to start the dormant period using MAC CE or DCI.

Furthermore, for example, notifying the terminal 20 of the suspension period from the base station 10 using MAC CE or DCI may be an instruction to start the suspension period.

Option 3-1 and Option 3-2 will be explained as specific operation examples of the terminal 20 in Option 3.

<Third Embodiment: Option 3-1>
In option 3-1, the terminal 20 does not assume that SSB will be transmitted from the base station 10 during the idle period. That is, the terminal 20 does not assume (expect) to monitor or receive SSB during the idle period. The terminal 20 does not assume that the base station 10 will transmit SSB during the idle period even if the SSB cycle (eg, ssb-periodicityServingCell in ServingCellConfigCommon) is set by the base station 10.

The base station 10 does not transmit SSB during the idle period. However, the base station 10 may transmit SSB during the idle period.

After the pause period ends, for example, the terminal 20 assumes that SSB is being transmitted at a cycle of a specific value (for example, 2 frames). Furthermore, after the end of the idle period, the terminal 20 may assume that the base station 10 is transmitting SSB according to the SSB cycle set by the base station 10 (eg, ssb-periodicityServingCell in ServingCellConfigCommon). Under this assumption, the terminal 20 can monitor SSB at the set SSB cycle. If the SSB cycle is not set by the base station 10, the terminal 20 may assume that the SSB cycle is a specific value (for example, 5 ms).

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

During periods B to C, the terminal 20 assumes that SSB is being transmitted from the base station 10 at a set period, and monitors the SSB.

<Third embodiment: Option 3-2>
In option 3-2, the terminal 20 assumes that half frames of SS/PBCH blocks arrive at a cycle of Y frames during the idle period. 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 values. Further, the value of Y may be different for each cell (each base station).

When the idle period ends, the terminal 20 assumes that SSB is being transmitted from the base station 10 according to the SSB cycle set by the base station 10 (eg, ssb-periodicityServingCell in ServingCellConfigCommon). Under this assumption, the terminal 20 can monitor SSB at the set SSB cycle. If the SSB cycle is not set by the base station 10, the terminal 20 may assume that the SSB cycle is a specific value (for example, 5 ms).

An example of the operation in option 3-2 will also be explained with reference to FIG. 11. At the time indicated by A, the terminal 20 receives an instruction to start the idle period from the base station 10, so that the idle period starts, and at the time indicated by B, the idle period ends. During the period A to B, the terminal 20 assumes that the base station 10 is transmitting SSB at a cycle of Y frames, and monitors the SSB. The same applies to the periods C to D.

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 cycle longer than a predetermined cycle, the terminal 20 can appropriately transmit SSB. It becomes possible to receive.

(Variation 1)
In the first to third embodiments described above, the operation that enables the use of a longer SSB cycle than in the prior art has been described. In this way, in addition to using a long cycle (or independently of using a long cycle), the transmission time length per SSB cycle (or the number of SSBs per cycle) can be improved compared to the conventional technology. Shorter transmission time lengths (fewer SSBs than prior art) may be used. For convenience of explanation, an SSB with a shorter transmission time length than the conventional technique or a smaller number of SSBs than the conventional technique per cycle will be referred to as a shortened SSB. Here, the number of SSBs per period of the shortened SSB may be one. Further, the time length per period of the shortened SSB may be smaller than 4 symbols.

In case 1, the terminal 20 performs monitoring assuming that the base station 10 transmits a shortened SSB of the time length/SSB number defined in the specifications, for example. In case 2, for example, the terminal 20 performs monitoring assuming that the base station 10 will transmit a shortened SSB of the time length/SSB number notified from the base station 10 in SIB1. In case 3, for example, the terminal 20 performs monitoring on the assumption that the base station 10 will transmit an SSB with a reduced time length/SSB number received in an RRC message after RRC connection from the base station 10.

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

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

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

The RRC setting from the base station 10 to the terminal 20 determines which operation the terminal 20 performs among the plurality of operations (each option, etc.) described in the first to third embodiments and variation 1. It may be determined by a notification/instruction of MAC CE, DCI, UCI, etc., or it may be determined according to the capability of the terminal 20.

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

(1) Capability information indicating whether to support extended SSB cycles (SSB cycles longer than conventional technology) (2) Capability information indicating whether to support the timer described in option 2 of the third embodiment ( 3) Capability information indicating whether or not to support suspension described in option 3 of the third embodiment

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

<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, base station 10 includes a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140. The functional configuration shown in FIG. 12 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names. Furthermore, the transmitting section 110 and the receiving section 120 may be collectively referred to as a communication section.

The transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information on a higher layer from the received signals. Further, the transmitter 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, DCI using PDCCH, data using PDSCH, etc. to the terminal 20.

The setting unit 130 stores preset setting information and various setting information to be sent to the terminal 20 in a storage device included in the setting unit 130, and reads them from the storage device as necessary.

The control unit 140 schedules DL reception or UL transmission of the terminal 20 via the transmission unit 110. Further, the control unit 140 includes a function to perform LBT. Further, the control unit 140 includes a timer function. A functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Further, the transmitting section 110 may be called a transmitter, and the receiving section 120 may be called a receiver.

<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 includes a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240. The functional configuration shown in FIG. 13 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names. The transmitting section 210 and the receiving section 220 may be collectively referred to as a communication section.

The transmitter 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and obtains higher layer signals from the received physical layer signals. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, DCI by PDCCH, data by PDSCH, etc. transmitted from the base station 10. For example, the transmitting unit 210 transmits a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH to another terminal 20 as D2D communication. (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) etc., and the receiving unit 220 may receive the PSCCH, PSSCH, PSDCH, PSBCH, etc. from the other terminal 20. Further, the transmitter 210 includes the antenna port described in this embodiment.

The setting unit 230 stores various types of setting information received from the base station 10 or other terminals by the receiving unit 220 in a storage device included in the setting unit 230, and reads the information from the storage device as necessary. The setting unit 230 also stores setting information that is set in advance.

The control unit 240 controls the terminal 20. Further, the control unit 240 includes a timer function. A functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. Further, the transmitter 210 may be called a transmitter, and the receiver 220 may be called a receiver.

According to this embodiment, at least the terminal, base station, and communication method described in Appendix 1 and Appendix 2 below are provided.

<Additional note 1>
(Additional note 1)
A control unit that assumes that the synchronization signal block is being transmitted from the base station at a cycle longer than a predetermined cycle at the time of initial access;
A terminal comprising: a receiving section that receives the synchronization signal block.
(Additional note 2)
The terminal according to supplementary note 1, wherein the predetermined period is 20 ms.
(Additional note 3)
When the control unit detects that at least one synchronization signal block includes a specific value, the control unit determines that the synchronization signal block is transmitted from the base station at a cycle longer than the predetermined cycle. It is assumed that the terminal described in

Supplementary Note

1 or 2.
(Additional note 4)
a control unit that assumes that the synchronization signal block is being transmitted from the base station at a cycle longer than a predetermined cycle, based on configuration information received from the base station;
A terminal comprising: a receiving section that receives the synchronization signal block.
(Additional note 5)
a transmitting unit that transmits setting information indicating a period for transmitting synchronization signal blocks to the terminal;
and a control unit that assumes that the synchronization signal block is being received in the terminal based on the setting information.
(Additional note 6)
Assuming that the synchronization signal block is being transmitted from the base station at a cycle longer than a predetermined cycle at the time of initial access,
A communication method performed by a terminal that receives the synchronization signal block.

Any of Items 1 to 6 provides a technique for realizing savings in power consumption of a base station in a wireless communication system. According to Additional Note 2, SSB can be monitored at a longer cycle than the existing cycle of 20 ms. According to Supplementary Note 3, even at the time of initial access, it can be known that SSB is being transmitted at a cycle longer than a predetermined cycle.

<Additional note 2>
(Additional note 1)
a receiving unit that receives a timer value from a base station;
and a control unit that assumes that no synchronization signal block is transmitted from the base station while the timer is in operation after the timer having the timer value starts.
(Additional note 2)
The terminal according to claim 1, wherein the control unit assumes that the synchronization signal block is transmitted from the base station at a period set by the base station after the timer expires.
(Additional note 3)
a receiving unit that receives a timer value from a base station;
A control unit that assumes that synchronization signal blocks are being transmitted from the base station at a cycle longer than a predetermined cycle while the timer is in operation after the timer having the timer value starts.
(Additional note 4)
a receiving unit that receives an idle period value from a base station;
A terminal comprising: a control unit that assumes that no synchronization signal block is transmitted from a base station during the idle period.
(Additional note 5)
a transmitter that transmits the timer value to the terminal;
and a control unit that performs control in the terminal so as not to transmit a synchronization signal block while the timer is in operation after the timer having the timer value starts.
(Additional note 6)
Receive the timer value from the base station,
A communication method performed by a terminal, wherein after a timer having the timer value starts, it is assumed that no synchronization signal block is transmitted from the base station while the timer is operating.

Any of Items 1 to 6 provides a technique for realizing savings in power consumption of a base station in a wireless communication system. According to Additional Note 2, SSB can be appropriately received after the timer expires.

(Hardware configuration)
The block diagrams (FIGS. 12 and 13) used to explain the above embodiments show blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, These include, but are not limited to, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. I can't do it. For example, a functional block (configuration unit) that performs transmission is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the base station 10, terminal 20, etc. in 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 terminal 20 described above are 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. Good too.

Note that in the following description, the word "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 each device shown in the figure, or may be configured not to include some of the devices.

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

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) that includes interfaces with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the above-described control unit 140, control unit 240, etc. may be implemented by the processor 1001.

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 to the storage device 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 12 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001. Further, for example, the control unit 240 of the terminal 20 shown in FIG. 13 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001. Although the various processes described above have been described as being executed by one processor 1001, they may be executed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunications line.

The storage device 1002 is a computer-readable recording medium, such as at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured. The storage device 1002 may be called a register, cache, main memory, or the like. The storage device 1002 can store executable programs (program codes), software modules, and the like to implement a communication method according to an embodiment of the present disclosure.

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

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 a network device, network controller, network card, communication module, etc., for example. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of. For example, a transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission path interface, etc. may be realized by the communication device 1004. The transmitting and receiving unit may be physically or logically separated into a transmitting unit and a receiving unit.

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts 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 have an integrated configuration (for example, a touch panel).

Further, 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 for each device.

The base station 10 and the terminal 20 also include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). A part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.

Additionally, the terminal 20 or the base station 10 may be provided in the vehicle 2001. FIG. 15 shows an example of the configuration of 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, a front wheel 2007, a rear wheel 2008, an axle 2009, an electronic control unit 2010, and various sensors 2021 to 2029. , an information service section 2012 and a communication module 2013. Each aspect/embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, may be applied to communication module 2013. The functions of the terminal 20 may be installed in the communication module 2013.

The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also referred to as a steering wheel), 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.

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

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

The information service department 2012 includes various devices such as car navigation systems, audio systems, speakers, televisions, and radios for providing various information such as driving information, traffic information, and entertainment information, as well as one or more devices that control these devices. It consists of an ECU. The information service unit 2012 provides various multimedia information and multimedia services to the occupants of the vehicle 2001 using information acquired from an external device via the communication module 2013 and the like.

The driving support system unit 2030 includes a millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioning locator (for example, GNSS, etc.), map information (for example, a high-definition (HD) map, an autonomous vehicle (AV) map, etc.) ), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors that prevent accidents and reduce the driver's driving burden. The system is comprised of various devices that provide functions for the purpose and one or more ECUs that control these devices. Further, the driving support system unit 2030 transmits and receives various information via the communication module 2013, and realizes a driving support function or an automatic driving function.

Communication module 2013 can communicate with microprocessor 2031 and components of vehicle 2001 via a communication port. For example, the communication module 2013 communicates with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, electronic Data is transmitted and received between the microprocessor 2031, memory (ROM, RAM) 2032, and sensors 2021 to 29 in the control unit 2010.

The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, various information is transmitted and received with an 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.

The communication module 2013 transmits the current signal from the current sensor input to the electronic control unit 2010 to an external device via wireless communication. In addition, the communication module 2013 also receives the front wheel and rear wheel rotational speed signals inputted to the electronic control unit 2010 and acquired by the rotational speed sensor 2022, the front wheel and rear wheel air pressure signals acquired by the air pressure sensor 2023, and the vehicle speed sensor. 2024, an acceleration signal obtained by acceleration sensor 2025, an accelerator pedal depression amount signal obtained by accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by brake pedal sensor 2026, and a shift lever. A shift lever operation signal acquired by the sensor 2027, a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by the object detection sensor 2028 are also transmitted to the external device via wireless communication.

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

(Supplementary information on 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, modifications, alternatives, replacements, etc. Probably. Although the invention has been explained using specific numerical examples to facilitate understanding of the invention, unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The classification of items in the above explanation is not essential to the present invention, and matters described in two or more items may be used in combination as necessary, and matters described in one item may be used in another item. may be applied to the matters described in (unless inconsistent). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of a plurality of functional sections may be physically performed by one component, or the operations of one functional section may be physically performed by a plurality of components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. Although the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of process description, such devices may be implemented in hardware, software, or a combination thereof. Software operated by the processor included in the base station 10 according to the embodiment of the present invention and software operated by the processor included in the terminal 20 according to the embodiment of the present invention are respectively random access memory (RAM), flash memory, and read-only memory. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

Furthermore, the notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, the notification of information may be physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper 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. Further, RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

Each aspect/embodiment described in this disclosure is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system). 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), and other appropriate systems and systems expanded based on these. It may be applied to at least one next generation system. Furthermore, a combination of a plurality of systems may be applied (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

In this specification, specific operations performed by the base station 10 may be performed by its upper node in some cases. In a network consisting of one or more network nodes including a base station 10, various operations performed for communication with a terminal 20 are performed by the base station 10 and other network nodes other than the base station 10. It is clear that this can be done by at least one of the following: for example, MME or S-GW (possible, but not limited to). Although the case where there is one network node other than the base station 10 is illustrated above, the other network node may be a combination of multiple other network nodes (for example, MME and S-GW). .

The information, signals, etc. described in this disclosure can be output from an upper layer (or lower layer) to a lower layer (or upper layer). It may be input/output via multiple network nodes.

The input/output information may be stored in a specific location (for example, memory) or may be managed using a management table. Information etc. to be input/output may be overwritten, updated, or additionally written. The output information etc. may be deleted. The input information etc. may be transmitted to other devices.

The determination in the present disclosure may be performed based on a value represented by 1 bit (0 or 1), a truth value (Boolean: true or false), or a comparison of numerical values (e.g. , comparison with a predetermined value).

Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create a website, When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.

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., which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

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 the channel and the symbol may be a signal. Also, the signal may be a message. Further, a component carrier (CC) may also be called a carrier frequency, a cell, a frequency carrier, or the like.

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

In addition, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or using other corresponding information. may be expressed. For example, radio resources may be indicated by an index.

The names used for the parameters mentioned above are not restrictive in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (e.g. PUCCH, PDCCH, etc.) and information elements may be identified by any suitable designation, the various names assigned to these various channels and information elements are in no way exclusive designations. isn't it.

In this disclosure, "Base Station (BS)," "wireless base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," and "gNodeB ( gNB)”, “access point”, “transmission point”, “reception point”, “transmission/reception point”, “cell”, “sector”, Terms such as "cell group," "carrier," "component carrier," and the like may be used interchangeably. A base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into multiple subsystems (e.g., small indoor base stations (RRHs)). Communication services can also be provided by Remote Radio Head). The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

A mobile station is defined by a person 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 It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes 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.

Additionally, the base station in the present disclosure may be replaced by a terminal. For example, a configuration in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) Each aspect/embodiment of the present disclosure may be applied. In this case, the terminal 20 may have the functions that the base station 10 described above has. Further, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be replaced with side channels.

Similarly, a terminal in the present disclosure may be replaced by a base station. In this case, a configuration may be adopted in which the base station has the functions that the above-described terminal has.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of operations. "Judgment" and "decision" include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, and inquiry. (e.g., searching in a table, database, or other data structure), and regarding an ascertaining as a "judgment" or "decision." In addition, "judgment" and "decision" refer to receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and access. (accessing) (e.g., accessing data in memory) may include considering something as a "judgment" or "decision." In addition, "judgment" and "decision" refer to resolving, selecting, choosing, establishing, comparing, etc. as "judgment" and "decision". may be included. In other words, "judgment" and "decision" may include regarding some action as having been "judged" or "determined." Further, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

The terms "connected", "coupled", or any variations thereof, refer to any connection or coupling, direct or indirect, between two or more elements and to each other. It may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled." The bonds or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access." As used in this disclosure, two elements may include one or more electrical wires, cables, and/or printed electrical connections, as well as in the radio frequency domain, as some non-limiting and non-inclusive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and non-visible) ranges.

The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applied standard.

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

As used in this disclosure, any reference to elements using the designations "first," "second," etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

"Means" in the configurations of each of the above devices may be replaced with "unit", "circuit", "device", etc.

Where "include", "including" and variations thereof are used in this disclosure, these terms, like the term "comprising," are inclusive. It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

A radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be called a subframe. A subframe may also be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter applied to the transmission and/or reception of a certain signal or channel. Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, and transmitter/receiver. It may also indicate at least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.

A slot may be 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. A slot may be a unit of time based on numerology.

A slot may include multiple mini-slots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol.

For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. It's okay. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe. Furthermore, one slot may be called a unit time. The unit time may be different for each cell depending on the numerology.

Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than the normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that long TTI (for example, normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1 ms, and short TTI (for example, short TTI, etc.) It may also be read as a TTI having the above TTI length.

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

Additionally, the time domain of an RB may include one or more symbols, and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

Note that one or more RBs include physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. May be called.

Additionally, a resource block may be configured by one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A bandwidth part (BWP) (which may also be called a partial bandwidth or the like) may represent a subset of consecutive common resource blocks (RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

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

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 of the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

The structures of radio frames, subframes, slots, minislots, symbols, etc. described above 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 symbols included in an RB, Configurations such as the number of subcarriers, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the present disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted similarly to "different."

Each aspect/embodiment described in this disclosure may be used alone, in combination, or may be switched and used in accordance with execution. In addition, notification of prescribed information (for example, notification of "X") is not limited to being done explicitly, but may also be done implicitly (for example, not notifying the prescribed information). Good too.

Although the present disclosure has been described in detail above, it is clear for those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as determined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and is not intended to have any limiting meaning on the present disclosure.

10 Base station 110 Transmitting section 120 Receiving section 130 Setting section 140 Control section 20 Terminal 210 Transmitting section 220 Receiving section 230 Setting section 240 Control section 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Driving part 2003 Restoration Part 2004 Axel Pedal 2005 Brake Pedal 2006 Shift Lever 2007 Front wheels 2008 Bearing 2009 Axis 2010 Electronic Control Division 2012 Electronic Control Division 20133 Communication Modular 2021 Current sensor 2022 Round Sensor 2023 Air pressure sensor 2024 vehicle speed Sensen Sa 2025 acceleration sensor 2026 brake Pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving support system section 2031 Microprocessor 2032 Memory (ROM, RAM)
2033 Communication port (IO port)

Claims

A control unit that assumes that the synchronization signal block is being transmitted from the base station at a cycle longer than a predetermined cycle at the time of initial access;
A terminal comprising: a receiving section that receives the synchronization signal block.
The terminal according to claim 1, wherein the predetermined period is 20ms.
When the control unit detects that at least one synchronization signal block includes a specific value, the control unit determines that the synchronization signal block is transmitted from the base station at a cycle longer than the predetermined cycle. The terminal according to claim 1.
a control unit that assumes that the synchronization signal block is being transmitted from the base station at a cycle longer than a predetermined cycle, based on configuration information received from the base station;
A terminal comprising: a receiving section that receives the synchronization signal block.
a transmitting unit that transmits setting information indicating a period for transmitting synchronization signal blocks to the terminal;
and a control unit that assumes that the synchronization signal block is being received in the terminal based on the setting information.
Assuming that the synchronization signal block is being transmitted from the base station at a cycle longer than a predetermined cycle at the time of initial access,
A communication method performed by a terminal that receives the synchronization signal block.