WO2024034034A1 - Terminal, base station, and communication method - Google Patents

Abstract

The present invention provides a terminal comprising a transmission unit that transmits a predicted value of a traffic amount to a base station and a reception unit that receives, from the base station, an instruction to deactivate a cell or an instruction to activate the cell, the instruction being determined on the basis of the predicted value.

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).

Additionally, NR Release 18 considers network energy saving techniques from both the base station and terminal perspectives.

In order to save energy in the network, it is being considered to perform highly accurate and adaptive control at the base station by transmitting support information from the terminal to the base station. However, no specific technology for achieving energy savings has been proposed.

Note that "energy saving" may be replaced with "power saving". Furthermore, in this specification, "network energy saving" includes the meanings of "base station energy saving" and "terminal energy saving".

The present invention has been made in view of the above points, and it is an object of the present invention to provide a technology for realizing energy saving in a network.

According to the disclosed technology, a transmitter that transmits a predicted value of traffic volume to a base station;
and a receiving unit that receives from the base station an instruction to disable a cell or an instruction to enable a cell, which is an instruction determined based on the predicted value.

According to the disclosed technology, a technology for realizing energy saving in a network 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. 2 is a diagram for explaining an SSB transmission cycle. It is a figure which shows the example of a setting of SMTC window. FIG. 3 is a diagram illustrating an example of measurement gap settings. FIG. 3 is a diagram for explaining the operation of the first embodiment. FIG. 7 is a diagram for explaining the operation of the second embodiment. FIG. 7 is a diagram for explaining the operation of the second embodiment. 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 technology is 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.

Furthermore, in the embodiments of the present invention described below, terms such as SSB used in existing NR are used. This is for convenience of description, and similar signals etc. may be called by other names.

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 FIG. 1 shows one base station 10 and one terminal 20, 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 notification information or 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.

A cell group provided by the base station 10A, which is a MN, is called an MCG (Master Cell Group), and a 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 network power saving 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, a technology is being considered in which the terminal 20 transmits assistance information to the base station 10, and the base station 10 uses the assistance information to perform operations for power saving. The support information is, for example, preferred SSB settings or traffic information of the terminal 20. However, in the related art, no network power saving technology using specific support information has been proposed in relation to this.

In this embodiment, "preferred SSB settings" and "traffic information of terminal 20" are used as support information to realize power saving of the network. Hereinafter, an embodiment related to "preferred SSB settings" will be described as a first embodiment, and an embodiment related to "traffic information of terminal 20" will be described as a second embodiment. The first embodiment and the second embodiment may be implemented in combination.

(First embodiment)
<Summary>
First, a first embodiment will be described. Although the first embodiment takes up SSB as an example of downlink signals that are periodically transmitted, the technology described in the first embodiment is also applicable to downlink signals other than SSB.

In a wireless communication system, periodic downlink (DL) transmission/reception such as SSB constantly consumes power of the base station 10 and terminal 20.

For the base station 10, the longer the SSB transmission cycle, the more likely it is possible to reduce power consumption and improve throughput, and for the terminal 20, the longer the SSB reception cycle, the more it is possible to reduce power consumption and improve throughput. there is a possibility. However, as the reception cycle becomes longer, the time required for synchronization, channel estimation, etc. in the terminal 20 becomes longer, which becomes a factor in reducing throughput if the propagation situation cannot be followed.

For example, if the terminal 20 hardly moves and the radio wave propagation environment is stable, there is no need to frequently monitor SSB, so power consumption can be reduced by lengthening the SSB reception cycle (or transmission cycle). can.

However, in the conventional technology, the SSB transmission cycle and reception cycle are set from the base station 10 to the terminal 20 regardless of the status of the terminal 20, so power consumption cannot be reduced.

Therefore, in the first embodiment, the terminal 20 notifies the base station 10 of a desired value related to SSB reception, and the base station 10 determines the SSB transmission cycle or reception cycle based on the desired value. changes) can be made. This makes it possible to save power in the network.

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

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 RRM using SSB>
An example of using SSB is radio resource management (RRM). That is, the terminal 20 performs radio resource management (RRM) by measuring the received quality or received power of the own cell or other cells by receiving the SSB. The terminal 20 ensures mobility performance through radio resource control.

Since the first embodiment deals with parameters related to RRM such as measurement gap, first, an example of basic operation related to RRM using SSB will be explained.

NR SSB is basically transmitted periodically within a time resource of the first half or the second half of one frame (10 ms). FIG. 3 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 period of SSB and the number of SSBs per period can be set for each cell.

Note that in this embodiment, it is mainly assumed that SSB is broadcast from the base station 10 regardless of a request from the terminal 20; On the other hand, a mode in which the base station 10 transmits SSB (this is called on-demand SSB) may be used.

By receiving the SSB, the terminal 20 can synchronize with the base station 10 (timing synchronization and frequency synchronization). In addition, beam management can also be performed using SSB.

When the terminal 20 performs a handover to another cell, when adding a new CC during CA, etc., the terminal 20 needs to maintain communication quality while maintaining the communication quality of its own cell or another cell. Measure reception quality (e.g. RSRP, RSRQ). Control related to such measurements is called RRM. Moreover, such a measurement may be called an RRM measurement. RRM measurement is performed using SSB or CSI-RS, and below, measurement using SSB will be explained as an example.

<SMTC window)
The NR is equipped with a function of notifying the terminal 20 from the base station 10 of information indicating the cycle and time window in which the terminal 20 measures (receives) SSB. This window is called the SMTC window (SSB based RRM Measurement Timing Configuration window). When the terminal 20 is notified of the SMTC window from the base station 10, it detects and measures SSB within the window and reports the results to the base station 10.

The time length of the SMTC window is set from the base station 10 to the terminal 20 based on the duration in the SSB-MTC, for example. The value of the time length is, for example, one of {sf1, sf2, sf3, sf4, sf5}. That is, it is any one of 1 ms, 2 ms, 3 ms, 4 ms, and 5 ms. However, in this embodiment, values other than these values (for example, a time length longer than 5 ms) may be used.

The periodicity of the SMTC window is set from the base station 10 to the terminal 20 using, for example, periodicityAndOffset in the SSB-MTC. The value of the period is, for example, one of {sf5, sf10, sf20, sf40, sf80, sf160}. That is, it is any one of 5ms, 10ms, 20ms, 40ms, 80ms, and 160ms. However, in this embodiment, values other than these values (for example, a period longer than 160 ms) may be used.

Furthermore, the frequency range for measurement is set from the base station 10 to the terminal 20 by ssbFrequency in MeasObjectNR. In the frequency range indicated by ssbFrequency, the terminal 20 does not assume SSB transmission in subframes outside the SMTC window.

Figure 4 shows an example of SMTC window settings. In the example of FIG. 4, in cell A, the SMTC window is set according to the SSB transmission cycle and time length (time width).

The SSB transmission cycle and measurement cycle (reception cycle) do not have to be the same. In the example of cell B in FIG. 4, the SMTC window cycle is longer than the SSB transmission cycle.

Note that the SMTC window may also be referred to as smtc. In addition to primary smtc, smtc includes smtc2, smtc2-LP, etc., but the explanation of the SMTC window (primary smtc) described in this embodiment is applicable to both smtc2 and smtc2-LP. .

<Measurement gap in RRM measurement>
For example, when the terminal 20 measures another cell with a frequency different from that of its own cell, or another cell with a RAT different from that of its own cell, the terminal 20 stops transmission and reception in the current cell (its own cell), Start RRM measurement of other cells (different cells). When the RRM measurement is completed, the terminal 20 resumes transmission and reception in its own cell. Note that a measurement gap may be used when measuring frequencies outside the active BWP in the own cell.

The time from when transmission/reception is stopped until transmission/reception is resumed is defined as the measurement gap.

Measurement gap length (MGL) is set by mgl in GapConfig in MeasGapConfig. The value of the MGL is, for example, one of {ms1dot5, ms3, ms3dot5, ms4, ms5dot5, ms6}. That is, it is any one of 1.5ms, 3ms, 3.5ms, 4ms, 5.5ms, and 6ms. However, in this embodiment, values other than these values (for example, a time length longer than 6 ms) may be used.

Measurement gap repetition period (MGRP) is set by mgrp in GapConfig in MeasGapConfig. For example, the value of the MGRP is one of {ms20, ms40, ms80, ms160}. That is, it is any one of 20ms, 40ms, 80ms, and 160ms. However, in this embodiment, values other than these values (for example, a period longer than 160 ms) may be used. Note that the measurement gap repetition period may also be referred to as measurement gap periodicity.

Figure 5 shows an example of measurement gap settings in NR. (3) in FIG. 5 shows a case where MGL=4ms and MGRP=20ms and a case where MGL=6ms and MGRP=160ms. The portion shown by (1) in FIG. 5(3) is shown in (1) in the upper row of FIG. Here, it is shown that measurement using the SMTC window is possible in 3 ms out of 4 ms excluding the time for RF retuning. The same applies to FIG. 5(2).

<Operation example of the first embodiment>
As described above, in the first embodiment, the terminal 20 notifies the base station 10 of the desired value regarding SSB reception, and the base station 10 determines (changes) the SSB transmission cycle based on the desired value. , smtc period is determined (changed), measurement gap period is determined (changed), etc. An example of the operation of the first embodiment will be described with reference to the sequence diagram of FIG. 6.

<S101>
In S101, the terminal 20 acquires information regarding its own operation. The information acquired in S101 is not limited to specific information, but for example, any one, any plurality, or all of the following (1) to (4) is acquired. The information acquired in S101 is information regarding the operation at the time of acquisition.

Note that "transmission and reception" that appears in the first embodiment and the second embodiment means "transmission or reception." That is, "transmission and reception" means "transmission only," "reception only," or "both transmission and reception."

(1) Information indicating the characteristics of the traffic to be sent and received (e.g. QoS information, amount of sent and received data, sent and received packet cycle, information on the application used)
(2) Power saving settings of the terminal 20 by the user (3) Information regarding movement of the terminal 20 (e.g. speed, speed)
(4) Information regarding radio wave propagation in the terminal 20 (e.g. path loss between the base station 10 and the terminal 20, radio wave propagation time (delay time) between the base station 10 and the terminal 20)
<S102>
In S102, the terminal 20 determines a desired value regarding SSB reception based on the information acquired in S101, and transmits terminal support information including the desired value to the base station 10. Although it is assumed that the terminal support information is transmitted using RRC, the terminal support information may be transmitted using signals other than RRC (eg, MAC CE, UCI). Note that the terminal assistance information may be referred to as "UE assistance information" or "UEAsistanceInfo."

The above desired value is, for example, one or more of smtc periodicity, smtc2 periodicity, smtc2-LP periodicity, measurement gap length, and measurement gap repetition period, or all of them. Alternatively, the desired value may be the transmission cycle at which the base station 10 transmits the SSB. The “transmission cycle at which the base station 10 transmits SSB” is also an example of the “desired value regarding SSB reception” for the terminal 20.

For example, when the terminal 20 hardly moves (that is, when the speed is 0 or smaller than a threshold), the terminal 20 determines that it can stably communicate in its own cell (or the current active BWP). , large values are notified to the base station 10 as desired values (eg, smtc periodicity and measurement gap repetition period).

For example, if the terminal 20 determines that the radio wave propagation situation in its own cell has deteriorated, it sets values smaller than the above values to the base station as desired values (e.g. smtc periodicity and measurement gap repetition period). Notify 10.

For example, if the terminal 20 is set to power saving mode by its own OS, the terminal 20 may set desired values (e.g. smtc periodicity and measurement gap) in order to avoid periodic reception of SSB as much as possible. A large value is notified to the base station 10 as a repetition period).

Note that the desired value mentioned above may be, for example, one of a plurality of values predefined in the specifications, etc., or a value other than the value specified in the specifications, etc. good.

<S103, S104>
Based on the desired value received from the terminal 20, the base station 10 determines whether to change the setting value (also referred to as a parameter) regarding SSB reception. The setting value regarding SSB reception is, for example, any one, any plurality, or all of smtc periodicity, smtc2 periodicity, smtc2-LP periodicity, measurement gap length, and measurement gap repetition period. Further, the setting value regarding SSB reception may be a transmission cycle in which the base station 10 transmits the SSB.

When the base station 10 changes the setting value related to SSB reception based on the desired value received from the terminal 20, it notifies the terminal 20 of the changed "setting value related to SSB reception" in S104. The notification in S104 may be performed using any of RRC, MAC, and DCI. Further, the notification in S104 may be a notification of a specific setting value to a specific terminal 20, or may be a broadcast notification to all terminals 20 in the cell of the base station 10.

For example, when the base station 10 receives a desired value for either or both of Measurement gap length and Measurement gap repetition period from the terminal 20, the base station 10 sets the desired value as the changed setting value and sends the desired value to the terminal 20. Notice.

Further, for example, when the base station 10 receives a plurality of different desired values of smtc periodicity (smtc2 periodicity, smtc2 periodicity or smtc2-LP periodicity) from a plurality of terminals 20, the base station 10 selects the minimum value of the plurality of desired values, It is notified within the cell as a setting value that applies to all terminals 20 in the cell of the base station 10.

Furthermore, when changing the smtc periodicity, the base station 10 may change the transmission cycle of SSB that is periodically transmitted within the cell to match the smtc periodicity. For example, if the SSB period before change is 40 ms and the smtc periodicity is changed to 320 ms, the base station 10 may change the SSB period to 320 ms. The base station 10 notifies the terminal 20 within the cell of the changed SSB transmission cycle using, for example, ssb-periodicityServingCell or ssb-periodicityServingCell-r18 in S104. The base station 10 transmits SSB at the changed period.

Further, for example, when the base station 10 receives a plurality of desired values with different SSB transmission cycles from a plurality of terminals 20, the base station 10 assigns the minimum value of the plurality of desired values to all terminals in the cell of the base station 10. It is also possible to notify within the cell as a setting value applied to 20. For example, if the SSB period before the change is 40 ms and the minimum desired value of the SSB transmission period is 160 ms, the base station 10 changes the SSB period to 160 ms, and Notify 20. The base station 10 transmits SSB at the changed period.

Regarding the smtc periodicity or SSB transmission period, in cases where the terminal 20 in the own cell of the base station 10 can satisfy the transmission/reception traffic requirements by SSB from other cells, the minimum value among multiple desired values is set. There may be cases where it does not apply. That is, the base station 10 may notify the terminal 20 of a value larger than the minimum value among the plurality of desired values received from the plurality of terminals 20 as the changed setting value.

<Other examples>
In S102 of FIG. 6, the terminal 20 may include information indicating that it wishes to "not receive periodic SSB" (this is an example of a desired value) in the terminal support information and notify it.

As mentioned above, in this embodiment, it is possible to use on-demand SSB. Therefore, for example, if the terminal 20 determines that it does not need periodic SSB reception because it does not move much, it notifies the base station 10 of information indicating that it wishes not to receive periodic SSB. . Furthermore, since the terminal 20 can perform control such as synchronization based on information from other cells, if the terminal 20 determines that the periodic SSB reception of its own cell is unnecessary, it can request to "not receive periodic SSB". The base station 10 may be notified of information indicating.

The base station 10, which has received the information indicating that it wishes not to receive periodic SSB from the terminal 20, sends a notification indicating that it has confirmed that it does not wish to receive periodic SSB, for example, in step S104. The terminal 20 is notified at the time. The terminal 20 that has received this notification does not receive the SSB periodically transmitted from the base station 10, for example. When the terminal 20 needs to receive SSB (for example, when synchronizing with the base station 10), it requests the base station 10 to transmit the SSB.

Furthermore, the base station 10 receives information indicating that it wishes not to receive periodic SSB from a plurality of terminals 20 in its own cell (for example, a proportion of terminals equal to or higher than a certain threshold among all terminals). If received, periodic SSB transmission may be stopped in the cell.

According to the first embodiment described above, power saving of the terminal 20 and the base station 10 can be realized.

(Second embodiment)
<Summary>
Next, a second embodiment will be described. In the second embodiment, it is assumed that communication (uplink, downlink, or both uplink and downlink) is performed between the base station 10 and the terminal 20 by carrier aggregation (dual connectivity may be possible). . One PCell (or PSCell) and one or more SCells are configured in the terminal 20.

In the conventional technology, the base station 10 can use a timer to perform control to deactivate the SCell when it is determined that the traffic of the terminal 20 does not occur for a predetermined period of time. This allows the base station 10 and the terminal 20 to save power.

On the other hand, if the power saving state continues despite the traffic of the terminal 20, problems such as throughput reduction and delay may occur from the user's perspective. In the conventional technology, it is not possible to quickly activate the SCell from a deactivated state depending on the traffic generation status of the terminal 20. In addition, in the conventional technology, since a timer is used to determine whether to deactivate, deactivation is delayed, and there is a problem that deactivation may not be performed even when there is no traffic.

In order to solve the above problem, in the second embodiment, the terminal 20 transmits information on the predicted value regarding the traffic at the terminal 20 to the base station 10, so that the base station 10 can predict the traffic pattern of the terminal 20. grasp. The base station 10 can quickly control activation/deactivation of the SCell based on the traffic pattern of the terminal 20.

<Operation example 1 of the first embodiment>
Operation example 1 of the second embodiment will be described with reference to the sequence diagram of FIG. 7.

<S201>
In S201, information regarding transmission and reception traffic at the terminal 20 is acquired (calculated). The information acquired in S201 is not limited to specific information, but for example, any one, any two, or all of the following (1) to (3) are acquired.

(1) Statistics of sent and received traffic on the terminal 20 (2) Amount of sent and received traffic expected from applications used by the user on the terminal 20 (3) Amount of sent and received traffic expected from the OS used on the terminal 20 The above The statistical amount of sent/received traffic in (1) may be, for example, the average value from a certain point in the past to the present, or it may be based on the chronological change in the amount of sent/received traffic from a certain point in the past to the present. It can be an estimated amount of future inbound and outbound traffic (e.g., an estimated amount of time-series inbound and outbound traffic from the present to a certain point in the future), or both (an average from past to present and an estimate of future inbound and outbound traffic). estimated value) or other values may be used.

Although the calculation of the future estimated amount in the second embodiment is executed by the control unit of the terminal 20, any method may be used for calculation. For example, regression analysis or DNN (deep learning) may be used.

The amount of sent/received traffic expected from an app in (2) above is, for example, the amount of future sent/received traffic estimated from the characteristics of the app (e.g., estimated time-series sent/received traffic from the present to a certain point in the future). amount) or other information. The same applies to (3) above. Note that the "future estimated amount" may also be referred to as a predicted value.

More specifically, in S201, the terminal 20 determines, for example, any one or more of "average data rate, average packet size, average number of packets, maximum burst size" of the transmission/reception traffic of the terminal 20. Obtain future estimators (e.g., time series estimators from now to some point in the future) for all. The above-mentioned "average" is, for example, an average over a certain period of time. The above-mentioned "maximum" is, for example, the maximum in a certain period of time.

<S202>
In S202, the terminal 20 transmits terminal support information including the information acquired in S201 to the base station 10. Although it is assumed that the terminal support information is transmitted using RRC, the terminal support information may be transmitted using signals other than RRC (eg, MAC CE, UCI). Note that the terminal assistance information may be referred to as "UE assistance information" or "UEAsistanceInfo."

<S203, S204>
In S203, the base station 10 estimates a time when no transmission/reception traffic occurs at the terminal 20 (or a time when the amount of transmission/reception traffic at the terminal 20 is less than a threshold value) based on the information received from the terminal 20 in S202, and determines the time when the transmission/reception traffic at the terminal 20 is less than the threshold. When (or just before that time), an instruction to deactivate the SCell is transmitted to the terminal 20 (S204). As a result, data transmission/reception is no longer performed in that SCell, so it is possible to save power in both the terminal 20 and the base station 10. Furthermore, the SCell can be deactivated more quickly than before.

Note that when the base station 10 determines that the amount of transmitted and received traffic in the entire area will be smaller than a threshold value at a certain time (and a certain length of time after that time) based on information received from multiple terminals 20 in its own area. Additionally, the radio waves used in the SCell may be stopped. In other words, the SCell in all terminals 20 in the own area may be deactivated.

Furthermore, while the SCell of the terminal 20 is disabled, the base station 10 estimates the time when the amount of transmitted and received traffic at the terminal 20 becomes larger than the threshold based on the information received from the terminal 20, and When the time comes (or just before the time), an instruction to enable the SCell is transmitted to the terminal 20. As a result, it is possible to reduce the delay in SCell validation control compared to the conventional technology.

<Operation example 2 of the second embodiment>
Operation example 2 of the second embodiment will be described with reference to the sequence diagram of FIG. 8.

In S301, the terminal 20 may acquire the information described in S201 above, and may notify the base station 10 of the acquired information using Buffer Status Report MAC CE or new MAC CE (S302).

Further, the information regarding the transmission/reception traffic acquired in S301 may be information on the transmission/reception traffic in the LCG (Logical Channel Group) corresponding to the MAC CE used for notification.

The content of the information transmitted in S302 may be the same as that in S202, for example, any one of "average data rate, average packet size, average number of packets, maximum burst size" of the transmission/reception traffic of the terminal 20. Alternatively, it may be a future estimator (for example, a time-series estimator from the present to a certain point in the future) for any plurality or all of them.

Furthermore, in S302, the terminal 20 may notify the current amount of UL buffer retention in the terminal 20 using the Buffer Status Report MAC CE or the new MAC CE. The UL buffer retention amount may be the RLC buffer retention amount, the PDCP buffer retention amount, or the total value of the UL buffer retention amount of the entire terminal 20.

In addition, instead of or in addition to the current UL buffer retention amount, the terminal 20 also calculates an estimated future amount of the UL buffer retention amount (for example, from the present to a certain point in the future). may be notified to the base station 10. The operations in S303 to S304 are the same as the operations in S203 to S204.

According to the second embodiment described above, power saving of the terminal 20 and the base station 10 can be realized.

(Other examples)
Only when the terminal 20 notifies the base station 10 of capability information (UE Capability) indicating that the terminal 20 supports the operation of notifying the desired value described in the first embodiment, the first embodiment The following operations may be performed.

Only when the terminal 20 notifies the base station 10 of capability information (UE Capability) indicating that the terminal 20 supports the operation of notifying information regarding traffic described in the second embodiment, the second embodiment The operation of the form may be performed.

(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. 9 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. As shown in FIG. 9, 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. 9 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 executes the determination at the base station described in the first embodiment and the second embodiment (determination of setting values/instructions based on information received from the terminal 20, etc.). 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. 10 is a diagram illustrating an example of the functional configuration of the terminal 20. As shown in FIG. 10, 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. 10 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. Further, for example, the transmitter 210 transmits a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (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.

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, in the first embodiment, the control unit 240 includes at least one of information indicating the characteristics of transmission and reception traffic in the terminal 20, power saving settings of the terminal 20, information regarding movement of the terminal 20, and information regarding radio wave propagation in the terminal 20. The desired value can be obtained (calculated) based on one of the following. Furthermore, in the second embodiment, the control unit 240 controls the terminal 20 based on at least one of the past traffic volume in the terminal 20, the application used in the terminal 20, and the OS used in the terminal 20. Obtain (calculate) the predicted value of traffic volume. 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 transmitter that transmits a desired value regarding reception of the synchronization signal to a base station that periodically transmits the synchronization signal;
A terminal comprising: a receiving unit that receives a setting value determined based on the desired value from the base station.
(Additional note 2)
The terminal according to supplementary note 1, wherein the desired value includes at least one of a reception period of the synchronization signal, a measurement gap period, and information indicating not to receive a periodic synchronization signal.
(Additional note 3)
The desired value is determined based on at least one of information indicating characteristics of traffic in the terminal, power saving settings of the terminal, information regarding movement of the terminal, and information regarding radio wave propagation in the terminal. The terminal according to Supplementary Note 1 or 2, further comprising: a control unit for acquiring information.
(Additional note 4)
a transmitter that periodically transmits a synchronization signal;
a receiving unit that receives a desired value regarding reception of the synchronization signal from a terminal,
The transmitting unit transmits a setting value determined based on the desired value to the terminal. A base station.
(Additional note 5)
transmitting a desired value regarding reception of the synchronization signal to a base station that periodically transmits the synchronization signal;
A communication method performed by a terminal, comprising: receiving a setting value determined based on the desired value from the base station.

According to any of Supplementary Notes 1 to 5, it is possible to realize power saving of at least one of a terminal and a base station in a wireless communication system. In particular, according to Additional Note 2, an appropriate value can be notified as the desired value. According to Additional Note 3, an appropriate desired value can be obtained.

<Additional note 2>
(Additional note 1)
a transmitting unit that transmits a predicted value of traffic volume to a base station;
a receiving unit that receives from the base station an instruction to disable a cell or an instruction to enable a cell, which is an instruction determined based on the predicted value.
(Additional note 2)
The terminal according to supplementary note 1, wherein the predicted value includes at least one of an average data rate, an average packet size, an average number of packets, and a maximum burst size.
(Additional note 3)
Supplementary note further comprising: a control unit that obtains the predicted value based on at least one of a past traffic amount in the terminal, an application used in the terminal, and an OS used in the terminal. Terminal according to item 1 or 2.
(Additional note 4)
a receiving unit that receives a predicted value of traffic volume from the terminal;
and a transmitting unit that transmits to the terminal an instruction to disable a cell or an instruction to enable a cell, which is an instruction determined based on the predicted value.
(Additional note 5)
transmitting a predicted value of traffic volume to a base station;
A communication method performed by a terminal, comprising: receiving from the base station an instruction to deactivate a cell or an instruction to activate a cell, which is an instruction determined based on the predicted value.

According to any of Supplementary Notes 1 to 5, it is possible to realize power saving of at least one of a terminal and a base station in a wireless communication system. In particular, according to Additional Note 2, an appropriate value can be notified as a predicted value. According to Additional Note 3, an appropriate predicted value can be obtained.

(Hardware configuration)
The block diagrams (FIGS. 9 and 10) 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 of implementing 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. 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. 11 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and 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. 9 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. 10 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. 12 shows an example of the configuration of the vehicle 2001. As shown in FIG. 12, a 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. The terminal 20 or base station 10 according to each aspect/embodiment described in this disclosure may be applied to a communication device mounted on the vehicle 2001, for example, may be applied to 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 signal, vehicle speed signal acquired by vehicle speed sensor 2024, acceleration signal acquired by acceleration sensor 2025, accelerator pedal depression amount signal 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 controls various devices such as car navigation systems, audio systems, speakers, televisions, and radios that provide (output) various information such as driving information, traffic information, and entertainment information, and these devices. It is composed of one or more ECUs. 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 information service department 2012 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, and an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).

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. Communication module 2013 may be base station 10 or terminal 20.

The communication module 2013 receives signals from the various sensors 2021 to 2028 described above that are input to the electronic control unit 2010, information obtained based on the signals, and input from the outside (user) obtained via the information service unit 2012. At least one of the information based on the information may be transmitted to an external device via wireless communication. The electronic control unit 2010, various sensors 2021-2028, information service unit 2012, etc. may be called an input unit that receives input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

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. The information service unit 2012 is an output unit that outputs information (for example, outputs information to devices such as a display and a speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 2013). may be called. 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), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is an integer or decimal number, for example)), FRA (Future Radio Access), NR (new Radio), New radio access ( NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802 Systems that utilize .16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems, and that are extended, modified, created, and defined based on these. The present invention may be applied to at least one of the next generation systems. 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. that 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 the present disclosure, the base station transmitting information to the terminal may be read as the base station instructing the terminal to control/operate based on the information.

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 body refers to a movable object, and the moving speed is arbitrary. Naturally, this also includes cases where the moving object is stopped. The mobile objects include, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, ships and other watercraft. , including, but not limited to, airplanes, rockets, artificial satellites, drones (registered trademarks), multicopters, quadcopters, balloons, and objects mounted thereon. Furthermore, the mobile object may be a mobile object that autonomously travels based on a travel command. It may be a vehicle (e.g. car, airplane, etc.), an unmanned moving object (e.g. drone, self-driving car, etc.), or a robot (manned or unmanned). good. 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" mean that resolving, selecting, choosing, establishing, comparing, etc. are considered to be "judgement" 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 Drive section 2003 Steering section 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Front wheel 2008 Rear wheel 2009 Axle 2010 Electronic control section 2012 Information service section 2013 Communication module 2021 Current sensor 2022 Rotational speed 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 support system section 2031 Microprocessor 2032 Memory (ROM, RAM)
2033 Communication port (IO port)

Claims (5)

1. a transmitting unit that transmits a predicted value of traffic volume to a base station;
   a receiving unit that receives from the base station an instruction to disable a cell or an instruction to enable a cell, which is an instruction determined based on the predicted value.
2. The terminal according to claim 1, wherein the predicted value includes at least one of an average data rate, an average packet size, an average number of packets, and a maximum burst size.
3. Claim further comprising: a control unit that acquires the predicted value based on at least one of a past traffic volume in the terminal, an application used in the terminal, and an OS used in the terminal. Terminal according to item 1.
4. a receiving unit that receives a predicted value of traffic volume from the terminal;
   and a transmitting unit that transmits to the terminal an instruction to disable a cell or an instruction to enable a cell, which is an instruction determined based on the predicted value.
5. transmitting a predicted value of traffic volume to a base station;
   A communication method performed by a terminal, comprising: receiving from the base station an instruction to deactivate a cell or an instruction to activate a cell, which is an instruction determined based on the predicted value.
   
   

Images