WO2023248692A1

WO2023248692A1 - Base station device, terminal device, and method

Info

Publication number: WO2023248692A1
Application number: PCT/JP2023/019257
Authority: WO
Inventors: 樹長野; 秀明 ▲高▼橋
Original assignee: 株式会社デンソー
Priority date: 2022-06-21
Filing date: 2023-05-24
Publication date: 2023-12-28

Abstract

A base station device (20) comprises: a control unit; and a communication unit configured to perform wireless communication under the control of the control unit. The control unit of the base station device (20) is configured to transmit instruction information for changing at least one of one or more discontinuous reception settings set in a terminal device (10) to the terminal device via the communication unit, by using a control message of a lower layer than an RRC message used for the one or more discontinuous reception settings.

Description

Base station device, terminal device, and method

Cross-reference of related applications

This application is based on Japan Application No. 2022-099927 filed on June 21, 2022, and claims the benefit of priority thereto, and all contents of the patent application are referred to as , incorporated herein by reference.

The present disclosure relates to a base station device, a terminal device, and a method that support intermittent reception.

In recent years, technological development regarding extended reality (eXtended Reality, XR) has progressed. XR is a concept that includes multimedia integration technologies such as virtual reality (VR), augmented reality (AR), mixed reality (MR), and substitute reality (SR). In XR, three-dimensional time-series image data in real space and/or virtual space, audio data of multiple channels (stereo, 5.1ch, etc.), data presented to other users, control data, etc. are transmitted and received in parallel. be done. XR requires low latency and high reliability to maintain and improve the quality of user experience.

Non-Patent Document 1 considers implementing XR in 5G NR (Fifth Generation New Radio), which is a wireless specification specified by the Third Generation Partnership Project (3GPP (registered trademark)).

In the above-mentioned XR implementation study, power consumption in the terminal device is mentioned as a consideration item. In XR, it is assumed that traffic having a so-called non-integer cycle (eg, 8.33 ms cycle, 16.67 ms cycle) based on the frame rate is transmitted to a terminal device. It is also assumed that a plurality of traffics having different cycles are transmitted to the terminal device.

As a technique for reducing power consumption, discontinuous reception (DRX) is used to intermittently receive a physical downlink control channel (PDCCH) that indicates information such as scheduling. Transmission and reception of various parameters and control information related to intermittent reception are described in Non-Patent Document 2.

As a result of detailed study by the inventor, the following problems were discovered. That is, in the intermittent reception technique described in Non-Patent Document 2, there is insufficient assumption for traffic having new transmission and reception characteristics, such as XR. Therefore, if the above-mentioned intermittent reception technique is applied as is to traffic having new transmission/reception characteristics, power consumption may increase or an appropriate intermittent reception operation may not be realized.

The present disclosure achieves both power consumption reduction and appropriate intermittent reception operation.

A base station device according to an aspect of the present disclosure is a base station device including a control unit and a communication unit configured to perform wireless communication under the control of the control unit, wherein the control unit The communication unit transmits instruction information for changing at least one of the one or more discontinuous reception settings set to the communication unit using a control message of a layer lower than the RRC message used for the one or more intermittent reception settings. The information is configured to be transmitted to the terminal device via the terminal device.

Further, a terminal device according to an aspect of the present disclosure is a terminal device including a control unit and a communication unit configured to perform wireless communication under the control of the control unit, wherein the control unit is configured to communicate wirelessly with a base station. Instruction information for changing at least one of the one or more discontinuous reception settings set by the device, the base station using a control message of a lower layer than the RRC message used for the one or more discontinuous reception settings. The device is configured to receive the instruction information transmitted from the device via the communication unit.

Further, a method according to an aspect of the present disclosure includes generating, in the base station device, instruction information for changing at least one of the one or more intermittent reception settings set in the terminal device; This method includes transmitting the instruction information to the terminal device using a control message of a lower layer than the RRC message used for configuration.

According to the above configuration, the base station apparatus transmits instruction information for changing the discontinuous reception setting set in the terminal apparatus to the terminal apparatus using a control message of a lower layer than the RRC message used for the discontinuous reception setting. Send to device. Therefore, the intermittent reception settings in the terminal device can be changed more quickly (that is, dynamically) than in a configuration using RRC messages. As a result, it is possible to perform an appropriate intermittent reception operation while suppressing an increase in power consumption. Note that, with the above configuration, other effects may be achieved instead of or in addition to this effect.

The above objects and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing is
FIG. 1 is a diagram showing a communication system S according to an embodiment, FIG. 2 is a diagram showing a U-plane protocol stack according to the embodiment, FIG. 3 is a diagram showing a C-plane protocol stack according to the embodiment, FIG. 4 is a block diagram showing a schematic hardware configuration of the terminal device 10 according to the embodiment, FIG. 5 is a block diagram showing a schematic functional configuration of the terminal device 10 according to the embodiment, FIG. 6 is a block diagram showing a schematic hardware configuration of the base station device 20 according to the embodiment, FIG. 7 is a block diagram showing a schematic functional configuration of the base station device 20 according to the embodiment, FIG. 8 is a diagram showing a radio frame configuration according to the embodiment, FIG. 9 is a diagram showing a radio resource control (RRC) state according to the embodiment, FIG. 10 is a schematic explanatory diagram of discontinuous reception (DRX) in the embodiment, FIG. 11 is an explanatory diagram of multiple types of traffic in the embodiment, FIG. 12 is an explanatory diagram of the relationship between a non-integer period and an integer period in the embodiment, FIG. 13 is a sequence diagram of DRX settings and settings changes in the embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that, in this specification and the drawings, elements that can be explained in the same manner are given the same reference numerals so that duplicate explanation can be omitted.

Each embodiment described below is only an example of a configuration that can realize the present disclosure. Each of the embodiments below can be modified or changed as appropriate depending on the configuration of the device to which the present disclosure is applied and various conditions. Not all of the combinations of elements included in the following embodiments are essential for realizing the present disclosure, and some of the elements can be omitted as appropriate. Therefore, the scope of the present disclosure is not limited by the configurations described in each embodiment below. A configuration that combines a plurality of configurations described in the following embodiments can also be adopted as long as there is no mutual contradiction.

1. Embodiment 1.1. Communication System As shown in FIG. 1, the communication system S of the embodiment includes one or more terminal devices (Terminal Apparatus) 10, one or more base station devices (Base Station Apparatus) 20, and a core network 30. The communication system S is configured according to predetermined technical specifications (TS). For example, the communication system S may comply with technical specifications (eg, 5G, 5G Advanced, 6G, etc.) defined by the Third Generation Partnership Project (3GPP).

In the communication system S, a user plane (User Plane) where user data is sent and received and a control plane (Control Plane) where control data is sent and received are separately configured. That is, the communication system S supports C/U separation. The user plane is abbreviated as U-plane, and the control plane is abbreviated as C-plane.

The base station device 20 manages at least one cell. A cell constitutes the smallest unit of communication area. For example, one cell belongs to one frequency (eg, carrier frequency) and is composed of one component carrier. The term "cell" may represent a wireless communication resource, and may also represent a communication target of the terminal device 10. The base station device 20 wirelessly communicates with the terminal device 10 located in its own cell in the U plane and the C plane. In other words, the base station device 20 terminates the U-plane protocol and the C-plane protocol for the terminal device 10.

The base station device 20 communicates with the core network 30 in the U plane and the C plane. More specifically, the core network 30 includes a plurality of logical nodes including an access and mobility management function (AMF) and a user plane function (UPF). The base station device 20 connects to the AMF on the C plane and to the UPF on the U plane.

The base station device 20 may be, for example, a gNB that provides the terminal device 10 with a U plane and a C plane that comply with 3GPP's 5G NR (New Radio) specifications, and connects to 3GPP's 5GC (5G Core Network). Also, the base station device 20 may be a device that complies with other older or newer 3GPP specifications.

The base station device 20 may be configured by a plurality of unit devices. For example, the base station device 20 may be configured with a centralized unit (CU), a distributed unit (DU), and a radio unit (RU).

A radio access network (RAN) is formed by interconnecting a plurality of base station devices 20. The radio access network formed by the base station device 20, which is a gNB, may be referred to as NG-RAN. The base station device 20, which is a gNB, may be referred to as an NG-RAN node.

The plurality of base station devices 20 are connected to each other by a predetermined interface (for example, an Xn interface). More specifically, for example, the plurality of base station apparatuses 20 are connected to each other by an Xn-U interface in the U plane, and are connected to each other by an Xn-C interface in the C plane. Note that a plurality of base station apparatuses 20 may be connected to each other by other interfaces with different functions and names.

Each base station device 20 is connected to the core network 30 through a predetermined interface (for example, an NG interface). More specifically, for example, each base station device 20 is connected to the UPF of the core network 30 via the NG-U interface on the U plane, and is connected to the AMF of the core network 30 via the NG-C interface on the C plane. Note that each base station device 20 may be connected to the core network 30 by another interface with a different function or name.

The terminal device 10 is a device that wirelessly communicates with the base station device 20 as described above, and may be, for example, a user equipment (UE) that operates according to the 3GPP 5G NR specifications. The terminal device 10 may also be a device that complies with other older or newer 3GPP specifications.

The terminal device 10 may be, for example, a mobile phone terminal such as a smartphone, a tablet terminal, a notebook PC, a communication module, a communication card, or an IoT device such as a surveillance camera or a robot. The terminal device 10 may be a vehicle (for example, a car, a train, etc.) or a device provided therein. The terminal device 10 may be a transport vehicle other than a vehicle (for example, a ship, an airplane, etc.) or a device installed therein. The terminal device 10 may be a sensor or a device provided therein. Note that the terminal device 10 is a terminal, a mobile station, a mobile terminal, a mobile device, a mobile unit, a subscriber station, a subscriber terminal, a subscriber device, a subscriber unit, a wireless station, a wireless terminal, a wireless device, a wireless unit, a remote It may also be referred to by other names, such as a station, remote terminal, remote device, remote unit, etc. The terminal device 10 supports advanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC), and massive machine type communications (mMTC). ) The device may be adapted to one or more of the following.

With reference to FIG. 2, the wireless protocol architecture between the terminal device 10 and the base station device 20 will be described. Furthermore, with reference to FIG. 3, the wireless protocol architecture between the terminal device 10 and the base station device 20 and between the terminal device 10 and the core network 30 will be described.

As shown in Figure 2, in the U-plane protocol stack, from the lowest layer, the physical (Physical, PHY) layer, media access control (MAC) layer, radio link control (Radio Link Control, RLC) layer. , a Packet Data Convergence Protocol (PDCP) layer, and a Service Data Adaptation Protocol (SDAP) layer. Each layer described above is terminated at the base station device 20 on the network side.

As shown in Figure 3, in the C-plane protocol stack, from the lowest layer, the physical (Physical, PHY) layer, media access control (MAC) layer, radio link control (Radio Link Control, RLC) layer. , a Packet Data Convergence Protocol (PDCP) layer, a Radio Resource Control (RRC) layer, and a Non-Access Stratum (NAS). Each layer described above other than the non-access layer is terminated at the base station device 20 on the network side. The non-access layer is terminated at the AMF of the core network 30 on the network side.

As shown in FIG. 4, the terminal device 10 includes a processor 101, a memory 102, an input/output interface 103, a wireless interface 104, and an antenna 105 as hardware elements. The above elements provided in the terminal device 10 are interconnected by an internal bus. Note that the terminal device 10 may include hardware elements other than those shown in FIG. 4.

The processor 101 is an arithmetic element that implements various functions of the terminal device 10. The processor 101 may be an SoC (System-on-a-Chip) including elements such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), and a memory controller.

The memory 102 is composed of at least one storage medium such as RAM (Random Access Memory) and eMMC (embedded Multi Media Card). The memory 102 is an element that temporarily or permanently stores programs and data used to execute various processes in the terminal device 10. The program includes one or more instructions for operation of the terminal device 10. The processor 101 realizes the functions of the terminal device 10 by loading a program stored in the memory 102 into the memory 102 and/or a system memory (not shown) and executing the program.

The input/output interface 103 is an interface that accepts operations on the terminal device 10 and supplies them to the processor 101, as well as presents various information to the user, and is, for example, a touch panel.

The wireless interface 104 is a circuit that performs various signal processing to realize wireless communication, and includes a baseband processor and an RF circuit. The wireless interface 104 transmits and receives wireless signals to and from the base station device 20 via the antenna 105.

As shown in FIG. 5, the terminal device 10 includes a control section 110 and a communication section 120 as functional blocks. The communication unit 120 includes at least one transmitter 121 and at least one receiver 122.

The control unit 110 may include at least one processor 101 and at least one memory 102. In other words, the control unit 110 may be realized by the processor 101 and the memory 102. The control unit 110 executes various control processes in the terminal device 10. For example, the control unit 110 controls wireless communication with the base station device 20 via the communication unit 120.

The communication unit 120 includes a wireless interface 104 and an antenna 105. In other words, the communication unit 120 is realized by the wireless interface 104 and the antenna 105. The communication unit 120 wirelessly communicates with the base station device 20 by transmitting and receiving wireless signals to and from the base station device 20 . The communication unit 120 may include a plurality of wireless interfaces 104 and antennas 105.

By operating the control unit 110, various processes of the terminal device 10 of this embodiment are executed.

As shown in FIG. 6, the base station device 20 includes a processor 201, a memory 202, a network interface 203, a wireless interface 204, and an antenna 205 as hardware elements. The above elements provided in the base station device 20 are interconnected by an internal bus. Note that the base station device 20 may include hardware elements other than those shown in FIG.

The processor 201 is an arithmetic element that implements various functions of the base station device 20. Processor 201 may be a CPU, and may also include other processors such as a GPU.

The memory 202 is configured by at least one storage medium such as ROM (Read Only Memory), RAM, HDD (Hard Disk Drive), and SSD (Solid State Drive). The memory 202 is an element that temporarily or permanently stores programs and data used to execute various processes in the base station device 20. The program includes one or more instructions for the operation of the base station device 20. The processor 201 realizes the functions of the base station device 20 by expanding the program stored in the memory 202 into the memory 202 and/or a system memory (not shown) and executing the program.

The network interface 203 is an interface used to transmit and receive signals with other base station devices 20 and the core network 30.

The wireless interface 204 is a circuit that performs various signal processing to realize wireless communication, and includes a baseband processor and an RF circuit. The wireless interface 204 transmits and receives wireless signals to and from the base station device 20 via the antenna 205.

As shown in FIG. 7, the base station device 20 includes a control section 210, a communication section 220, and a network communication section 230 as functional blocks. The communication unit 220 includes at least one transmitter 221 and at least one receiver 222.

The control unit 210 may include at least one processor 201 and at least one memory 202. In other words, the control unit 210 may be realized by the processor 201 and the memory 202. The control unit 210 executes various control processes in the base station device 20. For example, the control unit 210 controls wireless communication with the terminal device 10 via the communication unit 220. Further, for example, the control unit 210 controls communication with other nodes (for example, other base station devices 20, nodes of the core network 30) via the network communication unit 230.

The communication unit 220 includes a wireless interface 204 and an antenna 205. In other words, the communication unit 220 is realized by the wireless interface 204 and the antenna 205. The communication unit 220 wirelessly communicates with the terminal device 10 by transmitting and receiving wireless signals to and from the terminal device 10 . The communication unit 220 may include a plurality of wireless interfaces 204 and antennas 205.

The network communication unit 230 includes a network interface 203. In other words, the network communication unit 230 is realized by the network interface 203. The network interface 203 transmits and receives signals to and from the network (and by extension, the other nodes mentioned above).

Various processes of the base station device 20 of this embodiment are executed by the operation of the control unit 210.

1.2. Radio Resources The terminal device 10 and the base station device 20 communicate wirelessly with each other using radio resources in the frequency domain and time domain. The wireless resources will be explained below.

The transmission method for downlink communication from the base station device 20 to the terminal device 10 is, for example, orthogonal frequency division multiplexing (OFDM) using a cyclic prefix (CP), that is, CP-OFDM. be. The transmission method for uplink communication from the terminal device 10 to the base station device 20 is, for example, the above-mentioned CP-OFDM or the transform precoding (Transform) that performs Discrete Fourier Transform (DFT) spreading. This is DFTS-OFDM in which CP-OFDM is applied after precoding.

The cyclic prefix is a redundant signal that functions as a guard period to prevent inter-symbol interference and inter-carrier interference, and is inserted at the beginning of an OFDM symbol. There are two types of cyclic prefix: normal cyclic prefix and extended cyclic prefix.

A plurality of mutually orthogonal subcarriers are used as radio resources in the OFDM frequency domain. The plurality of subcarriers are arranged at predetermined sub-carrier spacing (SCS) Δf in the frequency domain. In the communication system S, multiple subcarrier spacings Δf may be applied. The subcarrier interval Δf is expressed, for example, by the following formula.
Δf= ^2μ・15[kHz]

Here, μ is an integer greater than or equal to 0, and can take at least one of the

values

0, 1, 2, 3, 4, 5, and 6. Therefore, the subcarrier interval Δf [kHz] can take at least one of the following values: 15, 30, 60, 120, 240, 480, and 960. Note that μ may take a value of 7 or more.

In the time domain of OFDM, a hierarchical radio frame structure is used as shown in FIG. One radio frame includes 10 subframes. One radio frame is divided into two half frames. The time length of a radio frame is 10 ms, the time length of a half frame is 5 ms, and the time length of a subframe is 1 ms. The above time length does not depend on the subcarrier interval Δf.

One subframe includes one or more slot(s). The number Ns of slots included in one subframe depends on the value of μ described above and, in turn, on the subcarrier interval Δf. The number of slots Ns is expressed, for example, by the following formula.
Ns= ^2μ

One slot includes multiple symbols. The number of symbols included in one slot depends on the type of cyclic prefix. For example, if a normal cyclic prefix is used, one slot includes 14 symbols. For example, if an extended cyclic prefix is used, one slot includes 12 symbols.

As described above, the number of slots and the number of symbols included in each radio frame, half frame, and subframe having a fixed time length are variable. Therefore, the time length of the slot and the time length of the symbol are also variable.

A resource element (RE) is a time-frequency domain radio resource unit composed of one subcarrier and one symbol. A resource block (RB) is a radio resource unit in the time-frequency domain that is composed of 12 subcarriers and a plurality of symbols.

A system frame number (SFN) that counts up by 1 from 0 to 1023 is assigned to the wireless frame. SFN0 is assigned to the next radio frame after the radio frame assigned SFN1023. Since the time length of a radio frame is 10 ms, one cycle of the system frame number is 10240 ms (=10.24 seconds).

Additionally, a Hyper-System Frame Number (H-SFN) may be used. The hyper system frame number is a number that counts up by 1 from 0 to 1023 every cycle of the system frame number. Since one period of the system frame number is 10.24 seconds, one period of the hyper system frame number is 10485.76 seconds (=about 2.91 hours).

Here, the base station device 20 may set one or more serving cells for the terminal device 10. A serving cell may correspond to a component carrier in the downlink and/or a component carrier in the uplink. A technique in which one or more serving cells are set and the base station device 20 and the terminal device 10 perform wireless communication may also be referred to as carrier aggregation.

Furthermore, the base station device 20 may set one or more bandwidth parts (BWP) to the terminal device 10 for each of one or more serving cells. For example, a downlink bandwidth part (DL-BWP) may be configured in the downlink of one serving cell. Further, an uplink bandwidth part (UL-BWP) may be configured in the uplink of one serving cell. Here, the DL-BWP may include an initial DL-BWP and/or a dedicated DL-BWP. Furthermore, the UL-BWP may include an initial UL-BWP and/or a dedicated UL-BWP. Hereinafter, BWP may include DL-BWP and/or UL-BWP.

1.3. Channel and Control Information The terminal device 10 and the base station device 20 transmit and receive user data and control information to and from each other. Transmission and reception of control information in the downlink and uplink will be exemplified below.

The terminal device 10 and the base station device 20 transmit and receive user data and control information using a plurality of hierarchical channels. The physical channel is a channel used for physical communication between the terminal device 10 and the base station device 20. Examples of physical channels include a physical downlink control channel (PDCCH), a physical broadcast channel (PBCH), and a physical uplink control channel (PUCCH).

A transport channel is a channel located above a physical channel, and is mapped to a physical channel in the PHY layer. Multiple transport channels may be mapped to one physical channel. Examples of transport channels include a downlink shared channel (DL-SCH) and an uplink shared channel (UL-SCH). For example, data on the downlink may also be referred to as DL-SCH data. Furthermore, for example, uplink data may also be referred to as UL-SCH data. Here, the DL-SCH data includes downlink user data. Furthermore, the UL-SCH data includes uplink user data.

A logical channel is a channel located above a transport channel, and is mapped to a transport channel in the MAC layer. Multiple logical channels may be mapped to one transport channel, and one logical channel may be mapped to multiple transport channels. Logical channels are classified according to the characteristics of the information they transmit. Examples of logical channels include a broadcast control channel (Broadcast Control CHannel, BCCH), a common control channel (Common Control CHannel, CCCH), and a dedicated control channel (Dedicated Control CHannel, DCCH).

The base station device 20 transmits downlink control information (DCI) to the terminal device 10 using the PDCCH, which is a physical channel. The DCI includes information regarding downlink and uplink resource allocation to the terminal device 10 and other control information for the terminal device 10. DCI is mapped to PDCCH and corresponds to layer 1 signaling.

Here, one or more formats may be defined regarding the transmission of DCI on PDCCH. The format defined for the transmission of DCI on the PDCCH may be referred to as the DCI format. For example, the DCI format is a DCI format used for scheduling of a physical downlink shared channel (PDSCH) (e.g., referred to as DCI format 1_0, DCI format 1_1, and/or DCI format 1_2). format). For example, the DCI format is a DCI format used for scheduling a physical uplink shared channel (Physical Uplink Shared CHannel, PUSCH) (for example, called DCI format 0_0, DCI format 0_1, and/or DCI format 0_2). format). Further, the DCI format may include a DCI format that is not used for PDSCH and/or PUSCH scheduling. The DCI format used for scheduling PDSCH and/or PUSCH may be referred to as a scheduling DCI format. A DCI format that is not used for PDSCH and/or PUSCH scheduling may be referred to as a non-scheduling DCI format. In this embodiment, for ease of explanation, the "DCI format" may be simply expressed as "PDCCH." Further, "DCI generated according to the DCI format" may be simply expressed as "DCI format".

For example, the base station device 20 may configure frequency domain resources and/or time domain resources for the terminal device 10 to monitor (that is, monitor) the PDCCH candidate set. For example, the frequency domain resource on which the terminal device 10 monitors the PDCCH candidate set may be referred to as a control resource set (CONtrol REsource SET, CORESET). Further, a time domain resource by which the terminal device 10 monitors the PDCCH candidate set may be referred to as a search space set (SSS). The terminal device 10 may monitor the PDCCH candidate set with one or more CORESETs in the DL-BWP of the serving cell in which PDCCH monitoring is configured according to the corresponding search space set. Here, monitoring may imply attempting to decode each of the PDCCH candidates according to the monitored DCI format. The above configuration may be referred to as blind decoding.

Here, a CRC (Cyclic Redundancy Check) scrambled by an RNTI (Radio Network Temporary Identifier) may be added to the DCI (or DCI format) transmitted on the PDCCH. CRC may also be referred to as CRC parity bits. Multiple types of RNTI are defined. For example, the base station device 20 includes information indicating C-RNTI (Cell-RNTI), information indicating MCS-C-RNTI (Modulation and Coding Scheme Cell-RNTI), and information indicating CS-RNTI (Configured Scheduling-RNTI). Each RNTI may be configured by sending an RRC message containing at least one of the following information: That is, a CRC scrambled by at least one of the C-RNTI, MCS-C-RNTI, and CS-RNTI may be added to the DCI (or DCI format) transmitted on the PDCCH.

That is, the terminal device 10 may monitor (and/or receive) the PDCCH and detect (and/or receive) the DCI format. Here, as will be described later, the terminal device 10 may perform PDCCH monitoring (and/or reception) during the active time in the DRX operation.

The terminal device 10 transmits uplink control information (UCI) to the base station device 20 using the PUCCH, which is a physical channel. The UCI includes control information such as a scheduling request (SR), a hybrid automatic repeat request (HARQ) Ack/Nack, and channel state information (CSI). UCI is mapped to PUCCH or PUSCH and corresponds to layer 1 signaling.

The base station device 20 transmits a MAC layer control element (CE) to the terminal device 10 using the DL-SCH, which is a transport channel. The downlink MAC CE includes control information such as a DRX (described later) command. The downlink MAC CE is mapped to the PDSCH via the DL-SCH and corresponds to layer 2 signaling.

The terminal device 10 transmits a MAC layer control element (CE) to the base station device 20 using the UL-SCH, which is a transport channel. The uplink MAC CE includes control information such as a buffer status report (BSR). The uplink MAC CE is mapped to the PUSCH via the UL-SCH and corresponds to layer 2 signaling.

The base station device 20 transmits (or broadcasts) system information (SI) to the terminal device 10 using BCCH, which is a logical channel. SI includes minimum system information (Minimum System Information, MSI) and other system information (Other System Information, OSI). The MSI includes a master information block (Master Information Block, MIB) and a system information block 1 (System Information Block 1, SIB1). SIB1 may be referred to as Remaining Minimum System Information (RMSI). The OSI includes system information blocks (SIB2~) other than SIB1. Of the BCCHs, MIB is mapped to PBCH via BCH (Broadcast CHannel), and SIB is mapped to PDSCH via DL-SCH.

The base station device 20 transmits control information in the RRC layer to the terminal device 10 using a signaling radio bearer (SRB) established between the terminal device 10 and the base station device 20 in the RRC layer. . Hereinafter, messages exchanged between the base station device 20 and the terminal device 10 in the RRC layer may be referred to as RRC messages. There are multiple types of SRBs (for example, SRB0, SRB1, SRB2, SRB3, SRB4). The SRB is used for sending and receiving NAS messages including control information in the NAS layer in addition to RRC messages. CCCH or DCCH is used to transmit the RRC message from the base station device 20 to the terminal device 10. CCCH and DCCH are each mapped to PDSCH via DL-SCH. RRC messages correspond to layer 3 signaling.

An RRC reconfiguration message will be described as an example of a downlink RRC message. The RRC reconfiguration message is an RRC message sent from the base station device 20 to the terminal device 10 using SRB1 or SRB3. DCCH is used for sending RRC reconfiguration messages. The RRC reconfiguration message is used to perform reconfiguration or modification regarding the connection between the base station device 20 and the terminal device 10.

The terminal device 10 transmits an RRC message to the base station device 20 using the above-mentioned SRB. CCCH or DCCH is used to transmit the RRC message from the terminal device 10 to the base station device 20. CCCH and DCCH are each mapped to PUSCH via UL-SCH. RRC messages correspond to layer 3 signaling.

A user equipment capability information (UECapability Information) message will be described as an example of an uplink RRC message. The user equipment capability information message is an RRC message sent from the terminal device 10 to the base station device 20 using SRB1. The DCCH is used to transmit user equipment capability information messages. The user equipment capability information message is used to notify the base station device 20 of information regarding the radio access capability of the terminal device 10.

A user equipment auxiliary information (UEAssistanceInformation) message will be described as an example of an uplink RRC message. The user equipment supplementary information message is an RRC message sent from the terminal device 10 to the base station device 20 using SRB1 or SRB3. The DCCH is used for transmitting user equipment supplementary information messages. The user equipment supplementary information message is used to notify the base station device 20 of various information (UE supplementary information) regarding the terminal device 10.

1.4. Radio Resource Control (RRC) State As shown in FIG. 9, the terminal device 10 is in one of three radio resource control (RRC) states: RRC connected (RRC_CONNECTED), RRC inactive (RRC_INACTIVE), and RRC idle (RRC_IDLE). or take.

The RRC connection (RRC_CONNECTED) state is a state in which a connection (RRC context) between the terminal device 10 and the base station device 20 has been established, and the terminal device 10 transmits and receives radio signals to and from the base station device 20. In the RRC inactive state (RRC_INACTIVE), the connection (RRC context) between the terminal device 10 and the base station device 20 is maintained, but the terminal device 10 does not transmit or receive radio signals with the base station device 20. In the RRC idle (RRC_IDLE) state, the connection (RRC context) between the terminal device 10 and the base station device 20 is released.

The power consumption of the terminal device 10 increases in the following order: RRC idle (RRC_IDLE) state, RRC inactive (RRC_INACTIVE) state, and RRC connected (RRC_CONNECTED) state.

1.5. Discontinuous Reception (DRX)
As a technique for reducing power consumption of the terminal device 10, discontinuous reception (DRX) is used. DRX may be applied to the terminal device 10 in an RRC idle state and an RRC connected state. DRX in the RRC connected state is called CDRX (Connected mode Discontinuous Reception).

As schematically shown in FIG. 10, when DRX is configured (or set), the terminal device 10 does not need to continuously monitor the PDCCH, and only monitors the PDCCH for a predetermined on-duration. Monitor. That is, the on-duration may be a period in which the terminal device 10 waits for receiving one or more PDCCHs (ie, PDCCH(s)). For example, after waking up, the terminal device 10 may wait to receive one or more PDCCHs during an on-duration. Furthermore, if the terminal device 10 succeeds in decoding the PDCCH, it may continue monitoring the PDCCH and start a timer (inactivity timer). Here, repetition (for example, periodic repetition) of a period (on-duration) may be set using a predetermined cycle (DRX cycle, DRX period).

In DRX in the RRC idle state, the terminal device 10, for example, intermittently monitors the PDCCH and receives a paging message that calls the terminal device 10. In CDRX, the terminal device 10, for example, intermittently monitors the PDCCH and receives resource allocation information (that is, the DCI format used for PDSCH and/or PUSCH scheduling). In DRX, a configuration may also be adopted in which short DRX (Short DRX) with a shorter cycle is executed first, and then long DRX (Long DRX) with a longer cycle is executed.

The first DRX parameters used to configure (or set) DRX in the terminal device 10 are illustrated below. Note that the first DRX parameter may be referred to as a first DRX parameter set or first DRX-related information. A DRX configuration that is set (in other words defined, determined, or identified) by a first DRX parameter may be referred to as a first DRX configuration. For example, the first DRX configuration may include at least one of an on-duration, an inactivity timer, and/or a cycle (in other words, a DRX cycle or period).

- An on-duration timer (drx-onDurationTimer) that indicates the length of the on-duration of the terminal device 10. This DRX parameter is used to set the on-duration value. For example, drx-onDurationTimer may be used to set the duration at the beginning of the DRX cycle.

- An inactivity timer (drx-InactivityTimer) that indicates the period during which the terminal device 10 maintains the on state after receiving the PDCCH (that is, the period until it becomes off state). This DRX parameter may correspond to the value of an inactivity timer. For example, the drx-InactivityTimer may be used to set a period after receiving a PDCCH (ie, a PDCCH occasion) that indicates a new DL transmission and/or UL transmission.

- Cycle of the on period in short DRX (for example, short cycle) (drx-ShortCycle). This DRX parameter may correspond to a cycle in short DRX (ie, DRX cycle, DRX period).

- Short cycle timer (drx-ShortCycleTimer) that indicates the duration of short DRX. For example, a period according to a short DRX cycle may be set in the terminal device 10 using drx-ShortCycleTimer.

- A start offset (drx-LongCycleStartOffset) indicating the cycle of the on period in long DRX (eg, long cycle) and/or the start position of DRX (eg, subframe and/or slot). This DRX parameter may correspond to a cycle in long DRX (ie, a DRX cycle or a DRX period). For example, drx-LongCycleStartOffset may be used to set a position at which a long DRX cycle and/or a short DRX cycle starts.

- Slot offset (drx-SlotOffset) indicating the delay until the on-period begins. For example, drx-SlotOffset may be used to set a delay before the on-duration timer (drx-onDurationTimer) is started. For example, a slot-level delay may be set using drx-SlotOffset.

- Symbol offset (drx-SymbolOffset) indicating the delay until the on-period begins. For example, drx-SymbolOffset may be used to set a delay before the on-duration timer (drx-onDurationTimer) is started.

Further, the second DRX parameter may be used to configure (or set) DRX in the terminal device 10. Note that the second DRX parameter may be referred to as a second DRX parameter set or second DRX-related information. The DRX settings that are set (in other words defined, determined, or identified) by the second DRX parameters may be referred to as second DRX settings. For example, the second DRX configuration may include at least one of an on-duration, an inactivity timer, and/or a cycle (in other words, a DRX cycle or period). For example, the base station device 20 may further set one or more on periods using a second parameter within the on period set using the first DRX parameter. That is, the second DRX setting may be applied to the on period set by the first DRX parameter. In this embodiment, the on-period set (defined, determined, identified) using the first DRX parameter is referred to as a "first on-period." Furthermore, the on-period set (defined, determined, identified) using the second DRX parameter is referred to as a "second on-period". That is, the first on period is included in the first DRX setting. Further, the second on period is included in the second DRX setting. For example, the base station apparatus 20 may set one or more on periods as a "second on period" in the terminal device 10 with respect to the "first on period". In this embodiment, the on period may include a first on period and/or a second on period.

-second on-duration: On-duration timer indicating the time length of the second on-duration. Used to set the value of the second on period. For example, a second on-duration may be used to set the duration at the beginning of the DRX cycle for the second on-duration.

-second DRX cycle: Second on-period cycle. A repetition (eg, periodic repetition) of the second on-period is set.

-second DRX offset 1: Indicates an offset value X for correcting the start position of the second on-period (for example, indicated using milliseconds, the number of subframes, and/or the number of slots). For example, the offset value X may be expressed as a value from the starting position of the first on period. Also, the offset value X may be expressed as a value from a reference frame (eg, SFN).

-second DRX offset 2: Indicates an offset value Y for correcting the start position of the second on period (for example, indicated using milliseconds, the number of subframes, the number of slots, and/or the number of symbols). For example, the offset value Y may be expressed as a value from the starting position of the first on period. The offset value Y may also be expressed as a value from a reference frame (eg, SFN).

-second drx-InactivityTimer: An inactivity timer that indicates the period during which the terminal device 10 maintains the on state in the second on period after receiving the PDCCH (that is, the period until it becomes the off state). For example, the second drx-InactivityTimer may be used to set a period after receiving a PDCCH (ie, a PDCCH opportunity) indicating a new DL and/or UL transmission.

Here, some of the second DRX parameters described above may not be specified. For example, second drx-InactivityTimer may not be specified. For example, the terminal device 10 may apply the value of a timer (inactivity timer) set based on the first DRX parameter to the second on-period. That is, the first DRX parameter may be applied to determining the second DRX configuration. That is, the first DRX parameter may be defined as a common parameter used to determine the first DRX setting and/or the second DRX setting.

Here, in this embodiment, the DRX parameters may include a first DRX parameter and/or a second DRX parameter. For example, the DRX parameters may be transmitted from the base station device 20 to the terminal device 10 in an RRC message. In particular, the DRX-Config IE, which is an example of an RRC information element (IE), includes parameters related to DRX, and RRCReconfiguration including the DRX-Config IE may be transmitted from the base station device 20 to the terminal device 10. DRX parameters may be included in other IEs. That is, part or all of the second DRX parameter may be included in the first DRX parameter. That is, a DRX-Config IE that includes a first DRX parameter that includes some or all of the second DRX parameter may be transmitted from the base station device 20 to the terminal device 10. Here, part or all of the first DRX parameter and part or all of the second DRX parameter may be transmitted from the base station device 20 to the terminal device 10 as separate IEs. For example, a first DRX-Config IE that includes some or all of the first DRX parameters, and a second DRX-Config IE that includes some or all of the second DRX parameters and is different from the first DRX-Config IE. -config IE may be transmitted from the base station device 20 to the terminal device 10.

For example, some or all of the DRX parameters used to configure DRX in the terminal device 10 may be transmitted from the base station device 20 to the terminal device 10 using an RRC message. Here, in this embodiment, the DRX parameters may include some or all of the first DRX parameters and/or some or all of the second DRX parameters.

That is, the base station device 20 may transmit an RRC message including some or all of the DRX parameters to the terminal device 10. Here, some or all of the DRX parameters may be set for a cell group including one or more serving cells. That is, the base station apparatus 20 may set up a cell group including one or more serving cells, and set some or all of the DRX parameters for the set cell group. For example, the base station device 20 may transmit an RRC message including information for configuring a cell group to the terminal device 10. Here, the cell group may be a cell group for setting MAC parameters. A cell group may also be referred to as a master cell group and/or a secondary cell group. Additionally, a cell group may be referred to as a DRX group.

The terminal device 10 receives an RRC message that includes some or all of the DRX parameters, and controls DRX operations based on some or all of the DRX parameters. That is, the terminal device 10 can control DRX operation for each cell group based on some or all of the DRX parameters. In particular, the DRX-Config IE, which is an example of an RRC information element (IE), includes some or all of the DRX parameters, and the RRCReconfiguration, which is an RRC message including the DRX-Config IE, is sent from the base station device 20 to the terminal device. 10 may be sent. Some or all of the DRX parameters may be included in other IEs.

Here, some of the DRX parameters may be set commonly for the cell group. That is, some of the DRX parameters may not be set for each cell group, but may be set as parameters common to one or more cell groups. Further, some or all of the DRX parameters may be set for each terminal device 10 and/or for each frequency range (FR). Furthermore, different parameter sets may be set as DRX parameters for each frequency range, and the same parameter set may be used for cell groups and/or serving cells that belong to the same frequency range.

Here, some or all of the second DRX parameters may be set for each of one or more serving cells. That is, the base station device 20 may set some or all of the second DRX parameters for each of one or more serving cells. Furthermore, the terminal device 10 may receive some or all of the second DRX parameters configured for each of one or more serving cells, and determine (or identify) the second DRX configuration. good. For example, some or all of the second DRX parameters may be set for each of one or more serving cells included in a certain cell group. Further, some or all of the second DRX parameters may be set for each of one or more DL-BWPs. That is, the base station device 20 may set some or all of the second DRX parameters for each of one or more DL-BWPs. Further, the terminal device 10 may receive some or all of the second DRX parameters set for each of one or more DL-BWPs and determine (identify) the second DRX settings. good. For example, some or all of the second DRX parameters may be set for each of one or more DL-BWPs in each of one or more serving cells included in a certain cell group.

That is, in the present embodiment, the first on-period may be defined for each first cycle (ie, DRX cycle, DRX period) set using the first DRX parameter. For example, the first on period corresponds to the period indicated by the value of drx-onDurationTimer. Further, the first cycle corresponds to the cycle indicated by the value of drx-LongCycleStartOffset.

For example, the first on period starts at a timing based on the value of drx-LongCycleStartOffset and the subframe number in order to start in accordance with the start timing of a subframe. Specifically, the first on-period is started at a timing (starting position) that satisfies the following conditions.
[(SFN × 10) + subframe number] modulo (drx-LongCycle) = drx-SrartOffset

Additionally, the first on period may be started with a delay corresponding to the value of drx-SlotOffset in order to adjust the start position on a slot-by-slot basis. Specifically, the first on period may be started with a delay of the number of slots indicated by drx-SlotOffset.

Here, as described above, the drx-InactivityTimer may be used to set a period after receiving a PDCCH (i.e., a PDCCH opportunity) indicating the transmission of a new DL and/or UL. For example, the terminal device 10 may consider the time during which drx-onDurationTimer or drx-InactivityTimer is operating as the active time. For example, the terminal device 10 may regard the time during which drx-onDurationTimer or drx-InactivityTimer set for a certain cell group is operating as the active time for the serving cell belonging to the certain cell group. Furthermore, the terminal device 10 may monitor the PDCCH during active time. For example, when a certain cell group is in active time, the terminal device 10 may monitor the PDCCH in a serving cell belonging to the certain cell group. In this embodiment, the active time is described as a time (period) during which the terminal device 10 monitors the PDCCH. For example, when the terminal device 10 detects PDCCH within the first on-period, it monitors the PDCCH even after the first on-period has elapsed until the period indicated by drx-InactivityTimer expires. drx-InactivityTimer indicates a period for monitoring PDCCH even after the first on period has elapsed, predicting that the next PDCCH will occur immediately if PDCCH is detected within the first on period. Good too.

Furthermore, in this embodiment, one or more second on-periods may be defined within the first on-period. The second on period may be defined for each second cycle (ie, DRX cycle, DRX period) that is set using a second DRX parameter within the first on period. For example, the second on-duration may be a second on-duration defined for the second DRX configuration. For example, the terminal device 10 for which the second on-period is set using the second parameter monitors the PDCCH only within the second on-period. The second cycle (i.e., DRX cycle, DRX period) configured using the second DRX parameter is the second on-period period (e.g., second DRX cycle) defined for the second DRX configuration. ). That is, the second cycle (DRX cycle, DRX period) set using the second DRX parameter may correspond to repetition (eg, periodic repetition) of the second on-period.

For example, the second on-period may start at a timing when a second cycle has elapsed from the start of the previous second on-period. This timing is determined by starting a timer when the second on period begins and measuring the second cycle.

In addition, in order to start the second on period in accordance with the start timing of a subframe, the second on period may be determined based on an offset value X (e.g., second DRX offset) defined for the second DRX setting and a subframe number. It may be started at a timing based on. This offset value X is defined, for example, in units of milliseconds and/or the number of subframes. Specifically, the second on-period is started at a timing (starting position) that satisfies the following conditions.
[(SFN × 10) + subframe number] modulo (second cycle) = offset value X

Furthermore, the second on period is started with a delay of an offset value Y specified by the second DRX setting, for example, in order to adjust the starting position in a predetermined unit (e.g., in units of slots). Good too. This offset value Y is defined, for example, in units of the number of slots or milliseconds. Specifically, the second on-period starts with a delay of the set offset value Y from the starting position of the first on-period. That is, the starting position of the second on-period may be determined based on the starting position of the first on-period. For example, the starting position of the first on period may be determined based on the SFN, and the starting position of the second on period may be determined based on the starting position of the first on period.

Here, as described above, the second drx-InactivityTimer may be used to set a period after receiving a PDCCH (ie, a PDCCH opportunity) indicating the transmission of a new DL and/or UL. For example, the terminal device 10 may consider the second on-duration or the time during which the second drx-InactivityTimer is operating as the active time. For example, the terminal device 10 may regard the second on-duration set for a certain cell group or the time during which the second drx-InactivityTimer is operating as the active time for the serving cell belonging to the certain cell group. . The terminal device 10 may monitor the PDCCH during active time.

Furthermore, as described above, the terminal device 10 may use the second drx-InactivityTimer if the second drx-InactivityTimer is set. That is, the terminal device 10 may use drx-InactivityTimer if second drx-InactivityTimer is not set. For example, the terminal device 10 may consider the second on-duration or the time during which drx-InactivityTimer is operating as the active time. For example, the terminal device 10 may regard the second on-duration set for a certain cell group or the time during which drx-InactivityTimer is operating as the active time for the serving cell belonging to the certain cell group. The terminal device 10 may monitor the PDCCH during active time. Furthermore, as described above, the second drx-InactivityTimer does not need to be defined. That is, the terminal device 10 may regard the second on-duration or the time during which the drx-InactivityTimer is operating as the active time, and monitor the PDCCH during the active time.

For example, if the second on-period is set, the terminal device 10 may monitor the PDCCH during the second on-period. That is, when the second on-period is set, the terminal device 10 does not need to monitor the PDCCH during the first on-period (that is, the first on-period excluding the second on-period). . That is, when the second on-period is set, the terminal device 10 may monitor the PDCCH in the second on-period, regardless of whether the first on-period is set. Furthermore, if the second on-period is not set and the first on-period is set, the terminal device 10 may monitor the PDCCH during the first on-period. For example, the second on-period may be defined to have a predetermined cycle and/or a predetermined time length (period) within the first on-period.

In normal DRX (including CDRX), the temporal arrangement of the on-period is specified by the system frame number (SFN) and subframe number. As described above, one cycle of the system frame number is 10240 ms (=10.24 seconds). When the above-mentioned one cycle ends, SFN returns to 0.

Extended Discontinuous Reception (eDRX) may be applied to introduce a longer time range into DRX. In eDRX, in addition to the system frame number (SFN) and subframe number, the above-mentioned hypersystem frame number is also used to specify the temporal arrangement of the on period. As described above, one period of the hypersystem frame number is 10485.76 seconds (=approximately 2.91 hours), so eDRX can use a longer time range.

1.6. Extended Reality (eXtended Reality, XR)
The characteristics of traffic generated in XR will be explained. In XR, multiple types of data (video data, audio data, user data, control data, etc.) are transmitted and received in parallel. The multiple data streams corresponding to the data have different traffic characteristics and quality of service (QoS) requirements.

Time shifts, expressed as jitter, variability, and fluctuation, may occur in the timing of transmitting and receiving the above data due to factors such as video and audio encoding, network delays, etc. There is.

Video data is transmitted and received based on a frame rate indicated in frames per second (FPS). For example, in the case of 60 FPS, data for one frame is transmitted and received every 16.67 ms, and in the case of 120 FPS, every 8.33 ms.

1.7. Characteristics of XR traffic and DRX
An XR-compatible terminal device 10 receives multiple data streams with different traffic characteristics. Note that "data stream(s)" is a series of data flows, traffic(s), traffic flows, etc. that are sent and received in chronological order. It can be expressed as word(s) indicating a signal.

As shown in FIG. 11, for example, the terminal device 10 receives multiple types of traffic. The multiple types of traffic include data traffic that arrives at a 10ms period, audio traffic that arrives at a 20ms period, and video traffic that arrives at a 16.67ms period. That is, each traffic has a different traffic period than other traffic.

The multiple types of traffic may include a variety of other traffic. For example, the terminal device 10 may receive intra-coded frames that are key frames that are not based on prediction and predicted frames that are predicted based on the intra-coded frames.

Like the video traffic described above, in XR, there is traffic that arrives at the terminal device 10 at a period having a value below the decimal point in milliseconds, that is, a so-called non-integer period. In the current situation where cellular networks are used for various purposes other than XR, it is preferable to handle traffic that does not conform to the DRX cycle, such as traffic with a non-integer cycle.

In contrast, the periods that can be set in DRX (especially CDRX) specified in the 3GPP 5G NR specifications are limited to so-called integer periods, which are periods that do not have numbers after the decimal point in milliseconds.

In the case where traffic arrives at the terminal device 10 at a non-integer period as described above, it is assumed that the terminal device 10 executes the above-described DRX. For example, assume that when the non-integer cycle of video traffic is 16.67 ms, the DRX cycle, which is an integer cycle, is set to either 16 ms or 17 ms (a value close to the above-mentioned non-integer cycle).

As shown in FIG. 12, as time passes, the difference between the arrival timing of video traffic (non-integer period) and the DRX reception timing (integer period) increases. As a result, there are cases where video traffic cannot be received during the DRX on period, and cases where DRX is reset. That is, even if the terminal device 10 executes DRX with an integer period as described above, it cannot effectively receive traffic with a non-integer period, resulting in a delay in traffic reception at the terminal device 10 and a processing of the terminal device 10. A technical issue arises in that power consumption increases as the load increases.

It is naturally understood that the above technical problem is not limited to XR, but also occurs in other technologies in which traffic with non-integer cycles or traffic with other cycles that do not match the DRX cycle arrives at the terminal device 10. .

1.8. Multiple Discontinuous Reception (DRX) Settings Prior to explaining the measures to solve the above technical problem, multiple DRX settings will be explained. A plurality of DRX settings (a plurality of first DRX settings and/or a plurality of second DRX settings) are configured for the terminal device 10. In order to identify each of the plurality of DRX settings, a setting identifier (hereinafter also simply referred to as an identifier) may be set for each DRX setting. One DRX setting can be configured, for example, in Section 1.5. above. This may correspond to one DRX-Config IE that includes multiple DRX parameters as shown in . Here, as a DRX parameter, an identifier for identifying the DRX settings may be included in the DRX settings.

1.9. The base station device 20 dynamically changes the intermittent reception parameters of the terminal device 10. To solve the above-mentioned technical problem, the base station device 20 of the present embodiment dynamically changes the intermittent reception parameter of the terminal device 10. (DRX) instruction information (hereinafter also referred to as "first information") for changing at least one of the settings using a control message of a lower layer than the RRC message used for one or more discontinuous reception settings. , is configured to be transmitted to the terminal device 10 via the communication unit 220. Here, in the present embodiment, the one or more DRX settings may include one or more first DRX settings and/or one or more second DRX settings. The above operations can be applied to CDRX.

Further, the "control message of a layer lower than the RRC message" is, for example, the above-mentioned DCI or MAC CE, and will hereinafter be referred to as "lower layer control message" or "L1 (Layer 1) and/or It is sometimes expressed as "L2 (Layler 2) signaling". The "first information" is also referred to as setting information. That is, "instruction information," "first information," and "setting information" are expressions that can be replaced with each other, and may be simply expressed as "information." The word "first information" is an expression that means different from other information, and is an expression that assumes the existence of other ordinal information (for example, "second information"). do not have. On the other hand, other information described in the present application that is different from the "first information" may be expressed as "second information."

Throughout this application, the word "send" referred to above refers to the words "notify," "provide," "transmit," and "carry." It encompasses similar concepts such as Additionally, the word "alter" mentioned above is used throughout this application to "adjust," "modify," "add," "suspend," It encompasses similar concepts such as "maintain," "release," and/or "delete."

DRX settings for the terminal device 10 using RRC messages (for example, steps S1312 and S1314 described later) are semi-static configurations. When performing semi-static settings using RRC messages, the entire RRC settings of the terminal device 10 are updated, so the amount of information sent and received in the wireless section is relatively large, and the processing time is relatively long (for example, several hundreds of milliseconds). ), and a relatively large terminal load (and thus power consumption). Therefore, it can be understood that in many cases it is inappropriate to apply quasi-static settings using RRC messages to dynamic settings changes that are shorter than the time length level of several DRX cycles (i.e., several tens of milliseconds). .

In contrast, dynamic configuration using low-layer control messages requires less information to be sent and received, shorter processing time, and lower terminal load (and thus lower power consumption) than the quasi-static configuration described above. ) to perform the setting process. More specifically, regarding the processing time, when using DCI, the setting process can be executed at the symbol duration level, and when using MAC CE, the setting process can be executed at the level of several tens of ms.

Therefore, in this embodiment, as detailed below, the semi-static DRX settings configured in the terminal device 10 using RRC messages are partially changed using low layer control messages. Note that "changing the DRX settings" is a concept that includes "changing some DRX parameters included in the DRX settings" and "adding new DRX parameters to the DRX settings". Good too.

As shown in FIG. 13, in step S1310, the base station apparatus 20 configures the base station apparatus 20 with base station-side DRX settings corresponding to the plurality of DRX settings to be set for the terminal apparatus 10.

In step S1312, the base station device 20 transmits an RRC reconfiguration message including information indicating one or more DRX settings to the terminal device 10. For example, the base station device 20 may transmit an RRC reconfiguration message including information indicating one or more DRX settings for a certain cell group to the terminal device 10. That is, one or more DRX settings may be configured for a certain cell group (ie, each of the cell groups). The terminal device 10 may identify one or more DRX settings for a certain cell group (ie, each of the cell groups). The RRC reconfiguration message is generated by the base station device 20. The one or more DRX settings may be multiple DRX settings. Each DRX setting may be given an identifier that identifies the DRX setting. That is, each of the one or more DRX settings may be identified by an identifier. Priorities may be set for multiple identifiers. Other RRC messages may be used instead of the RRC reconfiguration message.

Here, each of the one or more DRX settings includes one or more DRX parameters. In this embodiment, the one or more DRX parameters may include one or more first DRX parameters and/or one or more first DRX parameters. For example, the one or more DRX parameters include an on-duration timer (drx-onDurationTimer), an inactivity timer (drx-InactivityTimer), which is described as a first DRX parameter for determining (specifying) a first DRX setting. At least any of a short cycle (drx-ShortCycle), a short cycle timer (drx-ShortCycleTimer), a slot offset (drx-SlotOffset), a symbol offset (drx-SymbolOffset), and/or a long cycle and start offset (drx-LongCycleStartOffset). may be included. In addition, the one or more DRX parameters include an on-duration timer (second on-duration), a second on-duration period ( at least one of a second DRX cycle), an offset value (second DRX offset 1, and/or a second DRX offset 2), and/or an inactivity timer (second drx-InactivityTimer). Additionally, the one or more DRX parameters may include an identifier that identifies the DRX settings. Here, the DRX parameters for determining (or specifying) each DRX setting are also referred to as individual DRX parameters.

In place of or in addition to the above-described identifier for each DRX setting, parameter identifiers that respectively identify the DRX parameters included in each DRX setting may be given to the DRX parameters.

The multiple DRX configurations may each correspond to multiple types of traffic as described above. For example, as described above, the plurality of DRX settings include DRX setting 1 that includes parameters for the period of the on period corresponding to data traffic, DRX setting 2 that includes the parameter for the period of the on period that corresponds to voice traffic, and video traffic. A DRX setting 3 may be included that includes a parameter of the period of the on-period corresponding to the on-period period. The above-mentioned on periods may be different from each other.

In step S1314, the terminal device 10 configures one or more DRX settings in the terminal device 10 based on information indicating one or more DRX settings included in the RRC reconfiguration message (or other RRC message). The terminal device 10 also monitors the PDCCH (that is, performs PDCCH monitoring during active time) using one or more configured DRX settings.

In step S1316, the base station apparatus 20 transmits first information for changing one or more DRX parameters included in at least one of the set one or more DRX settings to the RRC replay used in the one or more discontinuous reception settings. It is dynamically transmitted to the terminal device 10 using DCI or MAC CE, which is a control message of a layer lower than the setting. Here, changing one or more DRX parameters includes changing each value of one or more DRX parameters (DRX parameter value).

That is, the first information can be used to change one or more DRX parameters included in at least one of the one or more DRX settings. That is, the first information may be used to change the first DRX parameter and/or the second DRX parameter. Further, the first information may be used to adjust the first DRX parameter and/or the second DRX parameter. For example, the first information may be used to adjust the value of the first DRX parameter and/or the value of the second DRX parameter configured using the RRC message. That is, the first information may be used to indicate the value of the first DRX parameter set using the RRC message and/or the adjustment value for the value of the second DRX parameter. For example, the base station device 20 transmits an RRC message including information for setting the value of the first DRX parameter and/or information for setting the value of the second DRX parameter, and 1, the value of the first DRX parameter and/or the value of the second DRX parameter may be adjusted. For example, the terminal device 10 may determine the active time by applying the adjustment value indicated using the first information to the value of the first DRX parameter set using the RRC message. . For example, the terminal device 10 determines the start of drx-onDurationTimer by applying the adjustment value indicated using the first information to the value of the first DRX parameter set using the RRC message. You can. Furthermore, the terminal device 10 may determine the active time by applying the adjustment value indicated using the first information to the value of the second DRX parameter set using the RRC message. . For example, the terminal device 10 determines the start of the second on-duration by applying the adjustment value indicated using the first information to the value of the second DRX parameter set using the RRC message. You may.

Additionally, the first information (i.e., instruction information) may be used to add a new DRX parameter to at least one of the one or more DRX settings. The new DRX parameters described above are, for example, parameters used to further change the starting position of the DRX on period. Specifically, for example, the start position of the DRX on period determined by at least one of a short cycle (drx-ShortCycle), a slot offset (drx-SlotOffset), and a long cycle and start offset (drx-LongCycleStartOffset) is , is changed by the new DRX parameters described above. Therefore, in the above example, the starting position of the DRX on period is changed based on the first information (ie, instruction information). For example, an offset value indicated in the new DRX parameter may be added to the determined start position of the DRX on period. The offset value may take only a value of 0 or more, or may take a positive or negative value including 0. Note that values (or setting states) determined by other DRX parameters may be changed by new DRX parameters.

Here, a case will be described in which the first information is transmitted using the DCI of the PDCCH. Hereinafter, DCI includes the DCI format. That is, the DCI may include a DCI format used for PDSCH scheduling (ie, a scheduling DCI format used for downlink scheduling). Further, the DCI may include a DCI format used for PUSCH scheduling (that is, a scheduling DCI format used for uplink scheduling). The DCI may also include a non-scheduling DCI format (ie, a DCI format that is not used for PDSCH and/or PUSCH scheduling). For example, the DCI may include a DCI format used for reporting information regarding power saving. Further, the DCI may include a DCI format used to notify the first information.

For example, a CRC parity bit scrambled by at least one of the C-RNTI, MCS-C-RNTI, and CS-RNTI may be added to the DCI used for PDSCH and/or PUSCH scheduling. Furthermore, a CRC parity bit scrambled by PS-RNTI (power saving-RNTI) may be added to the DCI used to notify information regarding power saving. Further, a CRC parity bit scrambled by a certain RNTI (hereinafter also referred to as DRX-RNTI) may be added to the DCI used to notify the first information. Here, the base station device transmits information for configuring C-RNTI, information for configuring MCS-C-RNTI, information for configuring CS-RNTI, information for configuring PS-RNTI, and/or information for configuring DRX-RNTI. An RRC message including information to be set may be transmitted to the terminal device 10. Here, DRX-RNTI may be a fixed value or a value predefined by specifications or the like.

Additionally, as described above, the DCI may include first information used to change one or more DRX parameters (values of one or more DRX parameters). Here, one or more DRX parameters (values of DRX parameters) are DRX included in each of one or more DRX settings (one or more first DRX settings and/or one or more second DRX settings). It may be a parameter (a first DRX parameter and/or a first DRX parameter). That is, the one or more DRX parameters (DRX parameter values) may be DRX parameters included in each of the one or more DRX settings set by the base station device 20.

For example, the base station device 20 may transmit an RRC message (for example, the above-mentioned RRC reconfiguration message) including information indicating one or more DRX settings for a certain cell group. Here, each of the one or more DRX settings may include the value of one or more DRX parameters. Further, the base station device 20 may transmit DCI including first information used to change the value of one or more set DRX parameters on the PDCCH. Here, the base station device 20 may transmit the DCI including the first information in a serving cell belonging to the certain cell group. The terminal device 10 may determine the value of the DRX parameter based on the set value of one or more DRX parameters and the first information (the value set in the first information field). For example, the terminal device 10 may determine the value of one or more DRX parameters set for a certain cell group based on the detection of DCI including first information in a serving cell belonging to the certain cell group. (In other words, a changed value for one or more DRX parameters set for the certain cell group may be determined).

Furthermore, the base station device 20 includes an identifier that identifies each of the one or more DRX settings in the first information, thereby instructing the DRX settings to be changed and/or the value of the DRX parameter to be changed. Good too. For example, the base station device 20 transmits an RRC message including information indicating one or more DRX settings for a certain cell group, and transmits first information including an identifier that identifies each of the one or more DRX settings on the PDCCH. The transmission may indicate the DRX settings to be changed and/or the values of DRX parameters to be changed in the certain cell group. For example, the terminal device 10 detects DCI including first information with an identifier that identifies each of one or more DRX settings in a serving cell belonging to a certain cell group, and based on the identifier, , the DRX settings to be changed and/or the values of the DRX parameters to be changed may be determined (i.e., determining the changed value for one or more DRX parameters configured for the certain cell group). ).

Here, the base station device 20 may set one or more search space sets for a downlink bandwidth part (DL-BWP) set in a certain serving cell. That is, one or more search space sets may be set for each of one or more DL-BWPs. For example, the base station device 20 sends an RRC message to the terminal device 10 by transmitting an RRC message including parameters such as a search space set index, a PDCCH monitoring period (and/or a PDCCH monitoring offset), and an instruction for the search space set. You may also set one or more search space sets. Here, the instruction for the search space set is whether the search space set is a terminal-specific search space set (UE-specific Search Space Set, also referred to as USS) or a common search space set (Common Search Space Set). (also referred to as Set, CSS). That is, the search space set may include a USS and/or a CSS.

Furthermore, when the search space set is USS (that is, when the search space set is set as USS using an instruction for the search space set), the base station apparatus 20 transmits the first information to the terminal apparatus 10. may be set to monitor a PDCCH (also referred to as a PDCCH candidate) for a DCI (DCI format) that includes (hereinafter also referred to as setting monitoring of a PDCCH that includes first information). Furthermore, when the search space set is a CSS (that is, when the search space set is set as a CSS using an instruction for the search space set), the base station device 20 transmits the first information to the terminal device 10. PDCCH monitoring including PDCCH may be configured.

The terminal device 10 may monitor the PDCCH (PDCCH candidate) for the DCI (DCI format) including the first information in the USS and/or CSS based on the parameters that configure the search space set. That is, the terminal device 10 may monitor the PDCCH in the USS and/or CSS and detect the DCI (DCI format) including the first information.

As described above, one or more search space sets may be set for each of one or more DL-BWPs. That is, the terminal device 10 detects the DCI including the first information in the DL-BWP of the serving cell belonging to a certain cell group, and based on the first information (the value of the first information), the terminal device 10 detects the DCI including the first information. The value of one or more DRX parameters set for a cell group may be determined (that is, the value after change for one or more DRX parameters set for a certain cell group may be determined) ). That is, based on the detection of DCI including the first information in a certain serving cell and/or a certain DL-BWP, the terminal device 10 determines whether the certain serving cell and/or the certain DL-BWP belongs to a cell group. The value of one or more DRX parameters may be determined (changed).

Further, the terminal device 10 detects DCI including first information with an identifier that identifies each of one or more DRX settings in the DL-BWP of a serving cell belonging to a certain cell group, and based on the identifier, determines the The DRX settings to be changed and/or the values of the DRX parameters to be changed may be determined in a certain cell group (i.e., the value of one or more DRX parameters configured for the certain cell group after changes). value). That is, the terminal device 10 detects a certain serving cell and/or a DCI including first information with an identifier that identifies each of one or more DRX settings in a certain DL-BWP. Alternatively, the value of one or more DRX parameters set for a cell group to which the certain DL-BWP belongs may be determined (changed).

Furthermore, the terminal device 10 may specify the active time based on the determined DRX settings and/or the determined DRX parameters. For example, the terminal device 10 starts an on-duration timer (drx-onDurationTimer and/or second on-duration) based on the determined DRX settings and/or the determined DRX parameters, and the on-duration timer operates. The time spent doing so may be considered active time. Furthermore, the terminal device 10 starts an inactivity timer (drx-InactivityTimer and/or second drx-InactivityTimer) based on the determined DRX settings and/or the determined DRX parameters, and the inactivity timer operates. The time spent doing so may be considered active time. For example, the terminal device 10 may regard the time during which the on-period timer or inactivity timer is operating as the active time, and may monitor the PDCCH during the active time. That is, the DCI may include one or more fields indicating DRX parameters used to change one or more DRX settings. Here, the DRX parameter may correspond to the first information.

Additionally, the base station device 20 may transmit an RRC message that includes information for setting the number of bits (which may also be referred to as size or payload) of the first information field. That is, the base station device 20 may transmit an RRC message including information for setting the number of bits of the DCI (DCI format) including the first information. The terminal device 10 sets the field of the first information based on the information for setting the number of bits of the field of the first information (and/or the number of bits of the DCI (DCI format) including the first information). The number of bits may be determined. The terminal device 10 includes the first information based on the information for setting the number of bits of the field of the first information (and/or the number of bits of the DCI (DCI format) including the first information). The first information may be obtained by monitoring the PDCCH for the DCI format.

Here, the number of bits of the first information field (which may also be the number of bits of DCI (DCI format) including the first information) is based on the number of one or more DRX settings configured for the terminal device 10. may also be determined. That is, the terminal device 10 may determine the number of bits of the first information field for a certain cell group based on the number of one or more DRX settings set for that cell group. Further, the number of bits of the first information field may be determined based on an identifier given to one or more DRX settings set for the terminal device 10. For example, the terminal device 10 determines the number of bits of the first information field for a certain cell group based on an identifier (for example, the value of the identifier) assigned to one or more DRX settings set for the cell group. may be determined. For example, the terminal device 10 determines the number of bits of the first information field based on the highest value (i.e., the largest value) of the identifier values assigned to one or more DRX settings. Good too.

Further, the number of bits of the first information field (or the number of bits of DCI (DCI format) including the first information) may be determined by the number of one or more cell groups set for the terminal device 10. It may be determined based on That is, the terminal device 10 may determine the number of bits of the first information field based on the number of cell groups in which one or more DRX settings are configured. Furthermore, the number of bits in the first information field may be determined based on one or more cell group identifiers (also referred to as cell group indexes) set for the terminal device 10. For example, the terminal device 10 may determine the number of bits of the first information field based on an identifier (for example, an identifier value) assigned to a cell group in which one or more DRX settings are configured. For example, the terminal device 10 may determine the number of bits of the first information field based on the highest value (that is, the largest value) among the values of the identifiers of one or more cell groups.

That is, the number of bits of the first information field (or the number of bits of the DCI (DCI format) including the first information) may be the number of one or more DRX settings and/or the number of one or more cell groups. may be determined based on the number of . For example, the number of bits of the first information field (which may also be the number of bits of the DCI (DCI format) including the first information) is the number of one or more cell groups, and/or the number of bits of the one or more cell groups. The determination may be made based on the number of one or more DRX settings configured for each.

In addition, the number of fields of the first information (or the number of fields of the first information included in one DCI (DCI format)) may be one or more cell groups configured for the terminal device 10. may be determined based on the number of . That is, the terminal device 10 may determine the number of fields of the first information based on the number of cell groups in which one or more DRX settings are configured. Further, the number of fields of the first information may be determined based on one or more cell group identifiers (also referred to as cell group indexes) set for the terminal device 10. For example, the terminal device 10 may determine the number of fields of the first information based on an identifier (for example, an identifier value) assigned to a cell group in which one or more DRX settings are configured. For example, the terminal device 10 may determine the number of fields of the first information based on the highest value (that is, the largest value) among the values of the identifiers of one or more cell groups. Further, the number of fields of the first information may be determined based on the number of one or more DRX settings set for the terminal device 10. In other words, the number of fields of the first information may be determined based on the number of DRX settings configured for the terminal device 10. For example, the number of fields of the first information may be equal to the number of one or more DRX settings configured for the terminal device 10. For example, the terminal device 10 may determine the number of fields of the first information based on the number of one or more DRX settings configured for one or more cell groups.

That is, the number of fields of the first information (or the number of bits of the DCI (DCI format) including the first information) may be the number of one or more DRX settings and/or the number of one or more cell groups. It may be determined based on the number. For example, the number of fields of the first information (or the number of bits of the DCI (DCI format) including the first information) may be the number of one or more cell groups, and/or the number of the one or more cell groups. may be determined based on the number of one or more DRX settings configured for each of the following.

Here, the base station device 20 provides information for configuring one or more sets of DRX settings to be changed (first DRX settings and/or second DRX settings) and/or DRX parameters to be changed. An RRC message including information for configuring one or more sets of (a first DRX parameter value and/or a second DRX parameter value) may be transmitted. For example, the base station device 20 configures each of a first set of DRX settings to be changed, a second set of DRX settings to be changed, and/or a third set of DRX settings to be changed. An RRC message containing information on the information may be sent. Furthermore, the base station device 20 configures each of the first set of DRX parameters to be changed, the second set of DRX parameters to be changed, and/or the third set of DRX parameters to be changed. An RRC message containing information on the information may be sent.

Furthermore, the base station device 20 may indicate each of the one or more sets of configured DRX settings using the value of the first information (the value set in the field of the first information). Furthermore, the base station device 20 may indicate each of one or more sets of set DRX parameters using the value of the first information (the value set in the field of the first information). For example, if the value set in the first information is "01", the first set of DRX settings to be changed and/or the first set of DRX parameters to be changed may be indicated. good. Furthermore, if the value set in the first information is "10", the second set of DRX settings to be changed and/or the second set of DRX parameters to be changed may be indicated. good. Furthermore, if the value set in the first information is "11", a third set of DRX settings to be changed and/or a third set of DRX parameters to be changed may be indicated. good. That is, for example, the base station apparatus 20 sets one or more sets of corresponding DRX settings and/or by setting a value of "01", "10", or "11" in the first information field. Alternatively, one or more sets of DRX parameters may be indicated. That is, the base station device 20 may set one or more sets of DRX settings and/or one or more sets of DRX parameters corresponding to each value set in the first information field.

Here, the terminal device 10 may identify one or more sets of DRX settings based on the value set in the first information field, and determine (change) one or more DRX settings. Furthermore, the terminal device 10 may identify one or more sets of DRX parameters based on the value set in the first information field, and may determine (change) one or more DRX parameters. For example, when the terminal device 10 receives the first information set to "01", the terminal device 10 selects one or more information based on the first set of DRX settings and/or the first set of DRX parameters. The DRX settings and/or one or more DRX parameters may be determined (changed). Further, when the terminal device 10 receives the first information set to “10”, the terminal device 10 selects one or more information based on the second set of DRX settings and/or the second set of DRX parameters. The DRX settings and/or one or more DRX parameters may be determined (changed). Further, when the terminal device 10 receives the first information set to “11”, the terminal device 10 selects one or more information based on the third set of DRX settings and/or the third set of DRX parameters. The DRX settings and/or one or more DRX parameters may be determined (changed).

Furthermore, the terminal device 10 may specify the active time based on the determined DRX settings and/or the determined DRX parameters. For example, the terminal device 10 starts an on-duration timer (drx-onDurationTimer and/or second on-duration) based on the determined DRX settings and/or the determined DRX parameters, and the on-duration timer operates. The time spent doing so may be considered active time. Furthermore, the terminal device 10 starts an inactivity timer (drx-InactivityTimer and/or second drx-InactivityTimer) based on the determined DRX settings and/or the determined DRX parameters, and the inactivity timer operates. The time spent doing so may be considered active time. For example, the terminal device 10 may regard the time during which the on-period timer or inactivity timer is operating as the active time, and may monitor the PDCCH during the active time.

Here, operations related to DRX may be controlled in the MAC layer (which may also be referred to as a higher layer) in the base station device 20 and/or the terminal device 10. That is, the base station device 20 and/or the terminal device 10 may control the operations related to DRX as described above in the MAC layer. Further, as described above, the PDCCH (that is, the DCI including the first information) is exchanged in the PHY layer between the base station device 20 and the terminal device 10. That is, the first information received at the PHY layer in the terminal device 10 may be supplied to the MAC layer in the terminal device 10. When the MAC layer in the terminal device 10 is supplied with the first information from the PHY layer, it may control the operations related to DRX as described above. That is, the MAC layer in the terminal device 10 may determine (change) one or more DRX settings and/or one or more DRX parameters based on the first information supplied from the PHY layer.

Further, one or more DRX settings and/or one or more DRX parameters are determined (changed) in the RRC layer (which may also be referred to as a higher layer) in the base station device 20 and/or the terminal device 10. You can. That is, the first information received in the PHY layer of the terminal device 10 may be supplied to the RRC layer of the terminal device 10. When the RRC layer in the terminal device 10 is supplied with the first information from the PHY layer, it may determine (change) one or more DRX settings and/or one or more DRX parameters. That is, the RRC layer in the terminal device 10 may determine (change) one or more DRX settings and/or one or more DRX parameters based on the first information supplied from the PHY layer.

A case in which the first information is included in the MAC CE and transmitted will be described. In this embodiment, a logical channel identifier (Logical Channel IDentifier, LCID) may be defined. Here, the LCID field is used to identify the type of the corresponding MAC CE (for example, the content and/or format of the MAC CE). For example, the LCID value for DL-SCH and/or UL-SCH may be used as the LCID. For example, an LCID value for DL-SCH may be defined for a MAC CE used to change one or more DRX settings and/or one or more DRX parameters.

For example, a MAC CE used to change one or more DRX settings and/or one or more DRX parameters includes a cell group identifier, a serving cell identifier, and an identifier for identifying the one or more DRX settings to be changed. , an identifier for identifying one or more DRX parameters to be changed, and/or a value (or adjustment value) of one or more DRX parameters to be changed. That is, the MAC CE may include an identifier indicating the DRX setting to be changed, and one or more DRX parameters used for the setting change. Furthermore, instead of or in addition to the above identifier, the MAC CE may include a cell group identifier and/or a serving cell identifier corresponding to the DRX setting that is the target of the setting change. If an identifier indicating the DRX configuration is not included in the MAC CE, the cell group identifier and/or the serving cell identifier may implicitly indicate the DRX configuration that is the target of configuration change.

The above-described low layer control messages are not limited to DCI and MAC CE. Any control message used in a layer lower than the RRC layer can be used to transmit the first information (ie, instruction information) in step S1316.

In step S1318, based on the first information (i.e., instruction information) dynamically transmitted from the base station apparatus 20, the terminal device 10 determines whether one or more DRX settings are configured on the terminal device 10.

In step S1320, the terminal device 10 monitors the PDCCH (that is, performs DRX) using the changed one or more DRX settings (eg, offset on period).

According to the above configuration, the base station device 20 transmits the first information (i.e., instruction information) for changing the discontinuous reception setting set in the terminal device 10, rather than the RRC message used for the discontinuous reception setting. It is transmitted to the terminal device 10 using a lower layer control message. Therefore, the DRX settings in the terminal device 10 can be changed more quickly (that is, dynamically) than in a configuration using RRC messages. As a result, the DRX settings can be changed appropriately for traffic having new transmission/reception characteristics, thereby achieving both reduction in power consumption and appropriate DRX operation.

Note that in the above embodiment, a configuration is described in which the DRX settings (for example, the starting position of the on period) are changed using a control message of a layer lower than the RRC message. However, other control settings set in the terminal device 10 using control information such as the RRC message are changed using a control message of a layer lower than the RRC message. You can. That is, the technique of the above embodiment can be used not only for changing DRX settings but also for changing various other control settings.

2.1. Modifications Although the present disclosure has been described based on the embodiments described above, it is understood that the present disclosure is not limited to the embodiments or structures. The present disclosure also includes various modifications and equivalent modifications. Other combinations including one or more elements included in the above embodiments also fall within the scope and scope of the present disclosure.

The expressions such as words and collocations used in the above embodiments are merely examples, and may be replaced with substantially the same or similar expressions. In particular, since the technology according to the above embodiment relates to technical specifications, the expressions in the above embodiments may be replaced with substantially the same or similar expressions in the technical specifications (for example, the technical specifications cited in this specification).

The information sent and received in the above embodiments may be sent and received while being included in the same or different messages or the same or different elements already described in the technical specifications, or may be included in newly defined messages or elements. May be sent and received. Information transmitted and received in the above embodiments may be transmitted and received using a different layer and/or a different channel than in the above embodiments.

The means and/or functions provided by the device described in the above embodiments may be provided by software recorded in a tangible memory device and a computer executing it, only software, only hardware, or a combination thereof. Can be done. For example, if any of the above devices is provided by an electronic circuit that is hardware, it may be provided by a digital circuit that includes multiple logic circuits, or an analog circuit.

The apparatus described in the above embodiments executes a program stored in a non-transitory tangible storage medium. When this program is executed, a method corresponding to the program is executed.

2.2. Additional Notes A part or all of the above embodiments and modifications may be described as in the following additional notes, but are not limited to the contents of the following additional notes. In the following, a relationship is expressed in which a note that is subordinate to a plurality of notes is subordinate to a note that is subordinate to a plurality of notes. All of the additional dependent relationships expressed below are included in the above embodiments.

(Additional note 1)
A control unit (210);
A base station device (20) comprising a communication unit (220) configured to perform wireless communication under the control of the control unit,
The control unit transmits instruction information for changing at least one of the one or more discontinuous reception settings set in the terminal device to a control message of a layer lower than the RRC message used for the one or more intermittent reception settings. The base station device is configured to transmit data to the terminal device via the communication unit using the communication unit.

(Additional note 2)
The base station device according to supplementary note 1, wherein the instruction information is information used to change one or more intermittent reception parameters included in at least one of the one or more intermittent reception settings.

(Appendix 3)
The base station device according to supplementary note 2, wherein the one or more intermittent reception parameters changed by the instruction information are parameters used to determine a starting position of an on period of intermittent reception.

(Additional note 4)
The base station apparatus according to supplementary note 1, wherein the instruction information is information used to add a new intermittent reception parameter to at least one of the one or more intermittent reception settings.

(Appendix 5)
The new intermittent reception parameter added according to the instruction information is a parameter used to further change the starting position of the on period of intermittent reception determined by at least one of the one or more intermittent reception settings. The base station device according to appendix 4.

(Appendix 6)
The control message is downlink control information transmitted on a physical downlink control channel,
The base station device according to any one of Supplementary Notes 1 to 5, wherein the downlink control information includes one or more fields indicating intermittent reception parameters used to change the one or more intermittent reception settings.

(Appendix 7)
The base station device according to appendix 6, wherein the number of the one or more fields is configured based on the number of the one or more intermittent reception settings set in the terminal device.

(Appendix 8)
The control message is downlink control information transmitted on a physical downlink control channel,
The downlink control information includes a setting identifier indicating one or more intermittent reception settings that are subject to setting change, and one or more intermittent reception parameters used for the setting change. Base station equipment.

(Appendix 9)
The control message is a MAC CE, which is a control element of a media access control layer,
The MAC CE includes at least one of a configuration identifier, a serving cell identifier, and a cell group identifier indicating the discontinuous reception configuration that is the target of the configuration change, and one or more discontinuous reception parameters used for the configuration change. From Appendix 1 5. The base station device according to any one of 5.

(Appendix 10)
The base station device according to appendix 9, wherein a logical channel identifier is defined for the MAC CE.

(Appendix 11)
a control unit (110);
A terminal device (10) comprising a communication unit (120) configured to perform wireless communication under the control of the control unit,
The control unit is configured to provide instruction information for changing at least one of the one or more discontinuous reception settings set by the base station apparatus, and control of a layer lower than the RRC message used for the one or more discontinuous reception settings. A terminal device configured to receive, via the communication unit, the instruction information transmitted from the base station device using a message.

(Appendix 12)
In the base station device,
generating instruction information for changing at least one of one or more intermittent reception settings set in the terminal device;
A method comprising: transmitting the instruction information to the terminal device using a control message of a lower layer than the RRC message used for the one or more intermittent reception settings.

(Appendix 13)
A communication system (S) comprising a terminal device and a base station device that wirelessly communicate with each other,
The base station device (20) includes:
Instruction information for changing at least one of the one or more discontinuous reception settings set in the terminal device (10) using a control message of a layer lower than the RRC message used for the one or more intermittent reception settings. , transmitting to the terminal device via the wireless interface.

(Appendix 14)
In the base station device (20),
generating instruction information for changing at least one of the one or more intermittent reception settings set in the terminal device (10);
A program that causes the terminal device to transmit the instruction information using a control message of a lower layer than the RRC message used for the one or more intermittent reception settings.

(Appendix 15)
In the base station device (20),
generating instruction information for changing at least one of the one or more intermittent reception settings set in the terminal device (10);
transmitting the instruction information to the terminal device using a control message of a layer lower than the RRC message used for the one or more intermittent reception settings; recoding media.

Claims

A control unit (210);
A base station device (20) comprising a communication unit (220) configured to perform wireless communication under the control of the control unit,
The control unit transmits instruction information for changing at least one of the one or more discontinuous reception settings set in the terminal device to a control message of a layer lower than the RRC message used for the one or more intermittent reception settings. The base station device is configured to transmit data to the terminal device via the communication unit using the communication unit.
The base station apparatus according to claim 1, wherein the instruction information is information used to change one or more discontinuous reception parameters included in at least one of the one or more discontinuous reception settings.
The base station apparatus according to claim 2, wherein the one or more intermittent reception parameters changed by the instruction information are parameters used to determine a starting position of an on period of intermittent reception.
The base station apparatus according to claim 1, wherein the instruction information is information used to add a new intermittent reception parameter to at least one of the one or more intermittent reception settings.
The new intermittent reception parameter added according to the instruction information is a parameter used to further change the starting position of the on period of intermittent reception determined by at least one of the one or more intermittent reception settings. The base station device according to claim 4.
The control message is downlink control information transmitted on a physical downlink control channel,
The base station apparatus according to claim 1, wherein the downlink control information includes one or more fields indicating intermittent reception parameters used to change the one or more intermittent reception settings.
The base station device according to claim 6, wherein the number of the one or more fields is configured based on the number of the one or more intermittent reception settings set in the terminal device.
The control message is downlink control information transmitted on a physical downlink control channel,
The base station apparatus according to claim 1, wherein the downlink control information includes a setting identifier indicating one or more intermittent reception settings that are subject to setting change, and one or more intermittent reception parameters used for the setting change.
The control message is a MAC CE, which is a control element of a media access control layer,
The MAC CE includes at least one of a configuration identifier, a serving cell identifier, and a cell group identifier indicating the discontinuous reception configuration that is the target of the configuration change, and one or more discontinuous reception parameters used for the configuration change. The base station device described in .
The base station apparatus according to claim 9, wherein a logical channel identifier is defined for the MAC CE.
a control unit (110);
A terminal device (10) comprising a communication unit (120) configured to perform wireless communication under the control of the control unit,
The control unit is configured to provide instruction information for changing at least one of the one or more discontinuous reception settings set by the base station apparatus, and control of a layer lower than the RRC message used for the one or more discontinuous reception settings. A terminal device configured to receive, via the communication unit, the instruction information transmitted from the base station device using a message.
In the base station device,
generating instruction information for changing at least one of one or more intermittent reception settings set in the terminal device;
A method comprising: transmitting the instruction information to the terminal device using a control message of a lower layer than the RRC message used for the one or more intermittent reception settings.