KR20200127808A - Method and apparatus for power saving of user equipment in wireless communication system - Google Patents

Abstract

Disclosed is a method for controlling monitoring of a downlink control channel of a terminal. According to the present disclosure, the method comprises the steps of: receiving configuration information for a power saving signal from a base station; monitoring a power saving signal from the base station based on the configuration information for the power saving signal from the base station; detecting the power saving signal based on the monitoring; and controlling a monitoring configuration of a physical downlink control channel (PDCCH) of the terminal based on the power saving signal.

Description

Method and device for power saving of terminal in wireless communication system {METHOD AND APPARATUS FOR POWER SAVING OF USER EQUIPMENT IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a method and apparatus for power saving of a terminal in a wireless communication system.

4G (4 ^th generation) to meet the traffic demand in the radio data communication system increases since the commercialization trend, efforts to develop improved 5G (5 ^th generation) communication system, or pre-5G communication system have been made. For this reason, a 5G communication system or a pre-5G communication system is called a Beyond 4G Network communication system or a Long-Term Evolution (LTE) system and a system after Post LTE. In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra high frequency (mmWave) band (eg, 60 gigabyte (70 GHz) band). To mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, in order to improve the network of the system, in 5G communication system, advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed. In addition, in the 5G system, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

On the other hand, the Internet is evolving from a human-centered network in which humans generate and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies. . The application of a cloud radio access network (cloud RAN) as the big data processing technology described above can be said as an example of the convergence of 3eG technology and IoT technology.

As described above and with the development of a wireless communication system, a variety of services can be provided, and thus a method for smoothly providing these services is required. In particular, there is a need for a communication method that saves power of a terminal in order to provide a service to a user for a longer time.

The disclosed embodiment is to provide a communication method and apparatus for saving power of a terminal in a wireless communication system.

According to an embodiment of the present disclosure, there is provided a method for controlling monitoring of a downlink control channel of a terminal, the method comprising: receiving configuration information for a power saving signal from a base station; Monitoring a power saving signal from the base station based on configuration information for the power saving signal from the base station; Detecting the power saving signal based on the monitoring; And controlling a monitoring setting of a downlink control channel (PDCCH) of the terminal based on the power saving signal.

The detecting of the power saving signal based on the monitoring may include: monitoring a predetermined search space in at least one of an active time of the terminal or an inactive time of the terminal; And detecting the power saving signal based on the monitoring.

The setting information for the power saving signal may include information on a control area through which the power saving signal is transmitted, information on a search space through which the power saving signal is transmitted, information on an occassion period of the power saving signal, information on an offset of the power saving signal, It may include at least one of format information of downlink control information corresponding to the power saving signal.

The power saving signal may include at least one of PDCCH monitoring period information of the terminal, DRX (Discontinuous Reception) related configuration information of the terminal, and state change indication information of the terminal.

The format of the downlink control information corresponding to the power saving signal detected at the active time of the terminal and the format of the downlink control information corresponding to the power saving signal detected at the inactive time of the terminal may be different.

The downlink control information corresponding to the power saving signal detected in the active time of the terminal may be scrambled with a Radio Network Temporary Identifier (RNTI) different from the downlink control information detected in the inactive time of the terminal.

The controlling of the monitoring setting of the downlink control channel of the terminal based on the power saving signal may include changing a monitoring period of the downlink control channel (PDCCH) of the terminal based on a power saving signal at an active time of the terminal. I can.

The controlling of the monitoring setting of the downlink control channel of the terminal based on the power saving signal includes: a downlink control channel of the terminal for a predetermined time from a predetermined time point based on a power saving signal at an inactive time of the terminal. May be to stop monitoring

According to an embodiment of the present disclosure, there is provided a method for a base station to control monitoring of a downlink control channel of a terminal, the method comprising: transmitting configuration information for a power saving signal to the terminal; Transmitting a power saving signal to the terminal based on configuration information for the power saving signal; And transmitting a control signal and data to the terminal based on the monitoring setting of the downlink control channel (PDCCH) of the terminal set based on the power saving signal.

In the transmitting of the power saving signal to the terminal based on the configuration information for the power saving signal, the size of the other downlink control information (DCI) monitored in the search space set in the terminal is the same size. It may be to transmit the DCI corresponding to the power saving signal arranged as possible.

According to an embodiment of the present disclosure, there is provided a terminal for controlling monitoring of a downlink control channel, the terminal comprising: a transceiver; And receiving setting information for a power saving signal from a base station, monitoring a power saving signal from the base station based on the setting information for a power saving signal from the base station, and detecting the power saving signal based on the monitoring. And at least one processor coupled with the transceiver for controlling a monitoring setting of a downlink control channel (PDCCH) of the terminal based on the power saving signal.

The processor may monitor a predetermined search space in at least one of an active time of the terminal or an inactive time of the terminal, and detect the power saving signal based on the monitoring. have.

The setting information for the power saving signal may include information on a control area through which the power saving signal is transmitted, information on a search space through which the power saving signal is transmitted, information on an occassion period of the power saving signal, information on an offset of the power saving signal, It may include at least one of format information of downlink control information corresponding to the power saving signal.

The power saving signal may include at least one of PDCCH monitoring period information of the terminal, DRX (Discontinuous Reception) related configuration information of the terminal, and state change indication information of the terminal.

The format of the downlink control information corresponding to the power saving signal detected at the active time of the terminal and the format of the downlink control information corresponding to the power saving signal detected at the inactive time of the terminal may be different.

The downlink control information corresponding to the power saving signal detected in the active time of the terminal may be scrambled with a Radio Network Temporary Identifier (RNTI) different from the downlink control information detected in the inactive time of the terminal.

The processor may change the monitoring period of the downlink control channel (PDCCH) of the terminal based on a power saving signal in the active time of the terminal.

The processor may stop monitoring the downlink control channel of the terminal for a predetermined time from a predetermined point in time based on a power saving signal in the inActive time of the terminal.

According to an embodiment of the present disclosure, there is provided a base station for controlling monitoring of a downlink control channel of a terminal, the base station comprising: a transceiver; And transmitting configuration information for a power saving signal to the terminal, transmitting a power saving signal to the terminal based on the configuration information for the power saving signal, and downlink control of the terminal configured based on the power saving signal. It may include at least one processor coupled with the transceiver that transmits control signals and data to the terminal based on the monitoring setting of the channel (PDCCH).

The processor may transmit the DCI corresponding to the power saving signal arranged to be the same size as the size of other downlink control information (DCI) monitored in the search space set in the terminal.

The disclosed embodiment can provide a communication method and apparatus capable of effectively saving power of a terminal in a mobile communication system.

1 is a diagram showing a basic structure of a time-frequency domain of a mobile communication system according to an embodiment of the present disclosure.
2 is a diagram illustrating a frame, subframe, and slot structure of a mobile communication system according to an embodiment of the present disclosure.
3 is a diagram for explaining setting of a bandwidth part of a mobile communication system according to an embodiment of the present disclosure.
FIG. 4 is a diagram for describing a control region setting of a downlink control channel in a mobile communication system according to an embodiment of the present disclosure.
5 is a diagram illustrating a structure of a downlink control channel of a mobile communication system according to an embodiment of the present disclosure.
6 is a diagram for describing discontinuous reception (DRX) according to an embodiment of the present disclosure.
7 is a diagram for describing Long DRX and Short DRX according to an embodiment of the present disclosure.
FIG. 8 is a diagram for explaining a wake-up signal (WUS) monitored at an active time and a go-to-sleep signal (GTS) monitored at an inactive time according to an embodiment of the present disclosure.
9 is a diagram illustrating a DCI format and size of WUS and GTS according to an embodiment of the present disclosure.
10 is a diagram illustrating a search space in which WUS and GTS are monitored according to an embodiment of the present disclosure.
11 is a diagram for describing DCI identification information according to an embodiment of the present disclosure.
12 is a diagram for describing a unified-power saving signal (uni-POSS) according to an embodiment of the present disclosure.
13 is a diagram for describing content included in uni-POSS according to an embodiment of the present disclosure.
14 is a diagram for explaining a search space and period of uni-POSS according to an embodiment of the present disclosure.
15 is a diagram illustrating a search space and period of uni-POSS according to an embodiment of the present disclosure.
16 is a diagram for describing a GTS according to an embodiment of the present disclosure.
17 is a diagram for describing a method of scaling a monitoring period based on a GTS according to an embodiment of the present disclosure.
18 is a diagram for explaining a method of transmitting a GTS for each cell group including a plurality of cells according to an embodiment of the present disclosure.
19 is a diagram for describing a method of transmitting a GTS for each cell according to an embodiment of the present disclosure.
20 is a diagram for describing a wake up signal (WUS) according to an embodiment of the present disclosure.
21 is a diagram for explaining a method of checking a WUS occasion area according to an embodiment of the present disclosure.
22 is a diagram for explaining a method of monitoring a physical downlink control channel (PDCCH) for receiving a WUS when a WUS occasion is located at an active time according to an embodiment of the present disclosure.
23 is a diagram for explaining a DCI format and size corresponding to WUS according to an embodiment of the present disclosure.
24 is a diagram for explaining a method of one-to-one mapping between WUS and DRX occasion according to an embodiment of the present disclosure.
25 is a diagram for explaining a method of one-to-N mapping between WUS and DRX occasion according to an embodiment of the present disclosure.
FIG. 26 is a diagram for explaining a method in which a WUS and a DRX occasion are mapped to 1 to N, and a WUS indicates whether a UE wakes up with 1 bit according to an embodiment of the present disclosure.
FIG. 27 is a diagram for explaining a method of indicating information on which time the terminal wakes up during an active time by a WUS according to an embodiment of the present disclosure.
28 is a diagram illustrating a relationship between a WUS operation and a short DRX according to an embodiment of the present disclosure.
29 is a diagram for describing a method of transmitting WUS for each cell group including a plurality of cells according to an embodiment of the present disclosure.
30 is a diagram for describing a method of transmitting WUS for each cell according to an embodiment of the present disclosure.
31 is a diagram illustrating a system for providing power saving signal setting information according to an embodiment of the present disclosure.
32 is a flowchart of an operation of a terminal controlling a PDCCH monitoring configuration according to an embodiment of the present disclosure.
33 is a flowchart of an operation of a base station controlling a PDCCH monitoring configuration according to an embodiment of the present disclosure.
34 illustrates the structure of a terminal according to an embodiment of the present disclosure.
35 shows a structure of a base station according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding components in each drawing.

Advantages and features of the present disclosure, and a method of achieving them will be apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, only the present embodiments make the disclosure of the disclosure complete, and common knowledge in the technical field to which the disclosure belongs. It is provided to completely inform the scope of the disclosure to those who have, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification. In addition, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

In addition, although the description may be made based on LTE (Long Term Evolution), LTE-A (LTE-Advanced), and NR (New Radio) systems, other communication systems having a similar technical background or channel type may also Embodiments can be applied. For example, the NR system may be a 5G mobile communication technology (5G, new radio, NR) developed after LTE-A, and the following 5G is a concept including existing LTE, LTE-A and other similar services. May be. In addition, the present disclosure may be applied to other communication systems (eg, Wi-MAX, Wi-Bro) through some modifications within a range not significantly departing from the scope of the present disclosure as a judgment of a person having skilled technical knowledge.

In this case, it will be appreciated that each block of the flowchart diagrams and combinations of the flowchart diagrams may be executed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer-usable or computer-readable memory, which can be directed to a computer or other programmable data processing equipment to implement a function in a particular way. It is also possible for the stored instructions to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for instructions to perform processing equipment to provide steps for executing the functions described in the flowchart block(s).

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, functions mentioned in blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

In this case, the term'~ unit' used in this embodiment refers to software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and'~ unit' performs certain roles. do. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further divided into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card. Also, in an embodiment, the'~ unit' may include one or more processors.

The wireless communication system deviated from the initial voice-oriented service, for example, 3GPP HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced. (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e. It is developing into a communication system.

As a representative example of a broadband wireless communication system, the LTE system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in downlink (DL), and Single Carrier Frequency Division Multiplexing (SC-FDMA) scheme in uplink (UL). ) Method is adopted. Uplink refers to a path and radio link through which a terminal (UE (User Equipment), MS (Mobile Station) or Terminal) transmits data or control signals to a base station (eNode B, gNode B, Node B or base station (BS)). And downlink refers to a radio link through which a base station transmits data or control signals to a terminal. As described above, the multiple access method is used to assign and operate each user's data or control information so that the time-frequency resources for carrying data or control information for each user do not overlap each other, that is, orthogonality is established. Can be distinguished. Of course, it is not limited to the above example, and in the 5G communication system, the use of the Non-Orthogonal Multiple Access (NOMA) scheme and the use of the OFDM scheme in the uplink are also considered.

As a future communication system after LTE, that is, a 5G communication system must be able to freely reflect various requirements such as users and service providers, services that simultaneously satisfy various requirements must be supported. Services considered for 5G communication systems include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliability low latency communication (URLLC). There is this.

eMBB aims to provide a more improved data rate than the data rate supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a maximum transmission rate of 20 Gbps in downlink and 10 Gbps in uplink from the viewpoint of one base station. In addition, the 5G communication system must provide the maximum transmission rate and at the same time provide the increased user perceived data rate of the terminal. In order to satisfy such requirements, it is required to improve various transmission/reception technologies, including more advanced multi-antenna (Multi Input Multi Output, MIMO) transmission technology. In addition, while transmitting signals using the maximum 20MHz transmission bandwidth in the 2GHz band used by LTE, the 5G communication system transmits data required by the 5G communication system by using a wider frequency bandwidth than 20MHz in the 3~6GHz or 6GHz or higher frequency band. Can satisfy the speed.

In addition, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC is required to support large-scale terminal access within a cell, improve terminal coverage, improved battery time, and reduce terminal cost. The IoT is attached to various sensors and various devices to provide a communication function, so it must be able to support a large number of terminals (for example, 1,000,000 terminals/km2) within a cell. In addition, because the terminal supporting mMTC is highly likely to be located in a shaded area not covered by the cell, such as the basement of a building due to the characteristics of the service, it may require wider coverage than other services provided by the 5G communication system. A terminal supporting mMTC should be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years may be required.

Finally, in the case of URLLC, it is a cellular-based wireless communication service used for a mission-critical purpose. For example, remote control of robots or machinery, industrial automation, unmaned aerial vehicles, remote health care, emergency situations. Services used for emergency alerts, etc. can be considered. Therefore, the communication provided by URLLC may have to provide very low latency (ultra low latency) and very high reliability. For example, a service that supports URLLC must satisfy air interface latency less than 0.5 milliseconds, and at the same time, may require a packet error rate of 10^-5 or less. . Therefore, for a service supporting URLLC, a 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is a design that allocates a wide resource in the frequency band to secure the reliability of the communication link. Requirements may be required.

The three services of 5G, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. In this case, different transmission/reception techniques and transmission/reception parameters may be used between services in order to satisfy different requirements of each service. Of course, 5G is not limited to the three services described above.

The present disclosure below is a method of monitoring a physical downlink control channel (PDCCH) to detect downlink control information (DCI) corresponding to a power saving signal and a DCI corresponding to a power saving signal in a wireless communication system, It provides a method for the terminal to perform power saving based on the detected DCI.

Hereinafter, a frame structure of a next-generation mobile communication system (5G or NR system) will be described in more detail with reference to the drawings.

1 is a diagram showing a basic structure of a time-frequency domain of a next-generation mobile communication system according to an embodiment of the present disclosure.

개의 연속된 RE들(도 1에서는 예시적으로 12로 도시됨)은 하나의 자원 블록(Resource Block, RB, 104)을 구성할 수 있다. 일 실시예에서, 복수 개의 OFDM 심볼들은 하나의 서브프레임(One subframe, 110)을 구성할 수 있다. Referring to FIG. 1, in FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The basic unit of a resource in the time and frequency domain may be a resource element (RE) 101. The resource element 101 may be defined as 1 Orthogonal Frequency Division Multiplexing (OFDM) symbol 102 on the time axis and 1 subcarrier 103 on the frequency axis. In the frequency domain

The consecutive REs (illustrated by 12 in FIG. 1) may constitute one resource block (RB, 104). In one embodiment, a plurality of OFDM symbols may constitute one subframe (110).

FIG. 2 is a diagram illustrating a frame, subframe, and slot structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

FIG. 2 shows an embodiment of a frame (Frame, 200), a subframe (Subframe, 201), and a slot (Slot, 202) structure. One frame 200 may be defined as 10 ms. In addition, one subframe 201 may be defined as 1 ms. That is, one frame 200 may consist of a total of 10 subframes 201.

)=14). 1 서브프레임(201)은 하나 또는 복수 개의 슬롯(202, 203)으로 구성될 수 있으며, 1 서브프레임(201)당 슬롯(202, 203)의 개수는 부반송파 간격에 대한 설정 값 μ(204, 205)에 따라 다를 수 있다. 도 2에서는 예시적으로, 부반송파 간격 설정 값으로 μ=0(204)인 경우와 μ=1(205)인 경우가 도시되어 있다. μ=0(204)일 경우, 1 서브프레임(201)은 1개의 슬롯(202)으로 구성될 수 있고, μ=1(205)일 경우, 1 서브프레임(201)은 2개의 슬롯(203)으로 구성될 수 있다. 즉 부반송파 간격에 대한 설정 값 μ에 따라 1 서브프레임 당 슬롯 수(

)가 달라질 수 있고, 이에 따라 1 프레임 당 슬롯 수(

)가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 아래의 [표 1]과 같이 정의될 수 있다.In one embodiment, one slot 202, 203 may be defined as 14 OFDM symbols (that is, the number of symbols per slot (

)=14). One subframe 201 may be composed of one or a plurality of slots 202, 203, and the number of slots 202, 203 per subframe 201 is a set value μ (204, 205) for the subcarrier interval. ) May vary. In FIG. 2, as examples of subcarrier spacing setting values, a case of μ=0 (204) and a case of μ=1 (205) are illustrated. When μ=0 (204), 1 subframe 201 may consist of 1 slot 202, and when μ=1 (205), 1 subframe 201 is 2 slots 203 It can be composed of. That is, the number of slots per 1 subframe according to the setting value μ for the subcarrier spacing (

) May vary, and the number of slots per frame (

) Can be different. According to each subcarrier spacing setting μ

And

Can be defined as shown in [Table 1] below.

3 is a diagram illustrating an example of setting a bandwidth part in a 5G communication system according to some embodiments of the present disclosure.

Referring to FIG. 3, FIG. 3 shows that the UE bandwidth 300 has two bandwidth parts, namely, bandwidth part #1 (BWP#1) 301 and bandwidth part #2 (BWP#2) 302 ) Shows an embodiment set to. The base station may set one or a plurality of bandwidth parts to the terminal, and may set information as shown in [Table 2] below for each bandwidth part.

Of course, it is not limited to the above-described example, and in addition to the above-described configuration information, various parameters related to the bandwidth part may be set to the terminal. The above-described information may be transmitted from the base station to the terminal through higher layer signaling, for example, RRC signaling, and system information such as MIB (Master Information Block). At least one bandwidth part among the set one or a plurality of bandwidth parts may be activated. Whether or not to activate the configured bandwidth part may be transmitted semi-statically from the base station to the terminal through RRC signaling or may be dynamically transmitted through downlink control information (DCI).

According to an embodiment, the terminal before the radio resource control (RRC) connection may receive an initial bandwidth part (Initial BWP) for initial access from the base station through a master information block (MIB). More specifically, in order to receive the system information (Remaining System Information; RMSI or System Information Block 1; may correspond to SIB1) required for initial access through the MIB in the initial access step, the terminal controls PDCCH to be transmitted Setting information about a region (Control Resource Set, CORESET) and a search space may be received. The control region and the search space set as the MIB may be regarded as identifiers (Identity, ID) 0, respectively.

The base station may notify the terminal of configuration information, such as frequency allocation information, time allocation information, and numerology, for control region #0 through the MIB. In addition, the base station may notify the UE of the setting information for the monitoring period and occasion for the control region #0, that is, the setting information for the search space #0 through the MIB. The UE may consider the frequency domain set to control region #0 obtained from the MIB as an initial bandwidth part for initial access. In this case, the identifier (ID) of the initial bandwidth part may be regarded as 0.

Setting of a bandwidth part supported by the above-described next-generation mobile communication system (5G or NR system) can be used for various purposes.

According to an embodiment of the present disclosure, when the bandwidth supported by the terminal is smaller than the system bandwidth, the base station may support it through the above-described bandwidth part setting. For example, the base station sets the frequency position (configuration information 2) of the bandwidth part to the terminal, so that the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

In addition, according to an embodiment of the present disclosure, in order to support different neurology, the base station may configure a plurality of bandwidth parts to the terminal. For example, in order to support both transmission and reception of data using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz to a specific terminal, the base station may set two bandwidth parts to a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz, respectively. Different bandwidth parts may be frequency division multiplexed. When data is to be transmitted/received at a specific subcarrier interval, a bandwidth part set at a specific subcarrier interval may be activated.

In addition, according to an embodiment of the present disclosure, for the purpose of reducing power consumption of the terminal, the base station may configure bandwidth parts having different bandwidths to the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits and receives data through the corresponding bandwidth, very large power consumption may occur. In particular, monitoring an unnecessary downlink control channel with a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. For the purpose of reducing the power consumption of the terminal, the base station may set a bandwidth part of a relatively small bandwidth to the terminal, for example, a bandwidth part of 20 MHz. In a situation where there is no traffic, the UE may perform a monitoring operation in the 20 MHz bandwidth part, and when data is generated, it may transmit and receive data in the 100 MHz bandwidth part according to the instruction of the base station.

In the above-described method of configuring a bandwidth part, UEs before RRC connection may receive configuration information on an initial bandwidth part through a Master Information Block (MIB) in an initial access step. More specifically, the terminal is a control region (Control Resource Set, CORESET) for a downlink control channel through which Downlink Control Information (DCI) scheduling a System Information Block (SIB) can be transmitted from the MIB of the PBCH (Physical Broadcast Channel). ) Can be set. The bandwidth of the control region set as the MIB may be regarded as the initial bandwidth part, and the UE may receive the PDSCH through which the SIB is transmitted through the set initial bandwidth part. In addition to the purpose of receiving the SIB, the initial bandwidth part may be utilized for other system information (OSI), paging, and random access.

Hereinafter, a Synchronization Signal (SS)/PBCH block of a next-generation mobile communication system (5G or NR system) will be described.

The SS/PBCH block may mean a physical layer channel block composed of a Primary SS (PSS), a Secondary SS (SSS), and a PBCH. More specifically, the SS/PBCH block may be defined as follows.

-PSS: A signal that serves as a reference for downlink time/frequency synchronization and may provide some information of the cell ID.

-SSS: This is a reference for downlink time/frequency synchronization, and the remaining cell ID information not provided by the PSS can be provided. Additionally, it can serve as a reference signal for demodulation of the PBCH.

-PBCH: It is possible to provide essential system information necessary for transmission and reception of the data channel and control channel of the terminal. The essential system information may include search space-related control information indicating radio resource mapping information of the control channel, scheduling control information for a separate data channel for transmitting system information, and the like.

-SS/PBCH block: The SS/PBCH block may be formed of a combination of PSS, SSS and PBCH. One or more SS/PBCH blocks may be transmitted within a 5ms time period, and each transmitted SS/PBCH block may be distinguished by an index.

The UE may detect the PSS and SSS in the initial access phase and may decode the PBCH. The UE can obtain the MIB from the PBCH and can receive the control region #0 set through the MIB. The UE may perform monitoring on the control area #0 assuming that the selected SS/PBCH block and the DMRS (Demodulation RS (Reference Signal)) transmitted in the control area #0 are in Quasi Co Location (QCL). The system information can be received by the downlink control information transmitted in area # 0. The terminal can obtain RACH (Random Access Channel) related configuration information necessary for initial access from the received system information. In consideration of the PBCH index, the PRACH (Physical RACH) can be transmitted to the base station, and the base station receiving the PRACH can obtain information on the SS/PBCH block index selected by the terminal. Among them, it can be seen that a block is selected, and the control region #0 corresponding to (or associated with) the SS/PBCH block selected by the UE is monitored.

Hereinafter, downlink control information (hereinafter referred to as DCI) in a next-generation mobile communication system (5G or NR system) will be described in detail.

Uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink data channel (Physical Downlink Shared Channel, PDSCH)) in a next-generation mobile communication system (5G or NR system) Scheduling information for may be delivered from the base station to the terminal through DCI. The UE may monitor a DCI format for fallback and a DCI format for non-fallback for PUSCH or PDSCH. The fallback DCI format may be composed of a fixed field that is predetermined between the base station and the terminal, and the DCI format for non-fallback may include a configurable field.

DCI may be transmitted through a physical downlink control channel (PDCCH) through a channel coding and modulation process. A Cyclic Redundancy Check (CRC) may be attached to the DCI message payload, and the CRC may be scrambling with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs according to the purpose of the DCI message, for example, UE-specific data transmission, power control command, or random access response, may be used for scrambling of CRC attached to the payload of the DCI message. That is, the RNTI is not explicitly transmitted, but may be included in the CRC calculation process and transmitted. When a DCI message transmitted on the PDCCH is received, the UE can check the CRC using the allocated RNTI. If the CRC check result is correct, the terminal can know that the message has been transmitted to the terminal.

For example, DCI scheduling a PDSCH for system information (SI) may be scrambled with SI-RNTI. The DCI scheduling the PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. The DCI scheduling the PDSCH for the paging message can be scrambled with P-RNTI. The DCI notifying the SFI (Slot Format Indicator) may be scrambled with SFI-RNTI. DCI notifying TPC (Transmit Power Control) can be scrambled with TPC-RNTI. The DCI for scheduling a UE-specific PDSCH or PUSCH may be scrambled with a Cell RNTI (C-RNTI).

DCI format 0_0 may be used as a fallback DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI. In one embodiment, the DCI format 0_0 in which CRC is scrambled with C-RNTI may include information as shown in [Table 3] below.

DCI format 0_1 may be used as a non-fallback DCI for scheduling a PUSCH, and in this case, the CRC may be scrambled with C-RNTI. In one embodiment, the DCI format 0_1 in which CRC is scrambled with C-RNTI may include information as shown in [Table 4] below.

DCI format 1_0 may be used as a fallback DCI for scheduling a PDSCH, and in this case, the CRC may be scrambled with C-RNTI. In an embodiment, the DCI format 1_0 in which CRC is scrambled with C-RNTI may include information as shown in [Table 5] below.

DCI format 1_1 may be used as a non-fallback DCI for scheduling the PDSCH, and in this case, the CRC may be scrambled with C-RNTI. In one embodiment, the DCI format 1_1 in which CRC is scrambled by C-RNTI may include information as shown in [Table 6] below.

FIG. 4 is a diagram for describing a control region setting of a downlink control channel of a next generation mobile communication system according to an embodiment of the present disclosure. That is, FIG. 4 is a diagram illustrating an embodiment of a control region (Control Resource Set, CORESET) through which a downlink control channel is transmitted in a 5G wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 4, FIG. 4 shows two control regions (control region #1 401, control region #2) within one slot 420 as a frequency axis and a UE bandwidth part 410 as a frequency axis. (402)) is shown in an embodiment. The control regions 401 and 402 may be set in a specific frequency resource 403 within the entire terminal bandwidth part 410 on the frequency axis. The control regions 401 and 402 may be set as one or a plurality of OFDM symbols on the time axis, which may be defined as a control region length (Control Resource Set Duration, 404). Referring to FIG. 4, control region #1 401 may be set to a control region length of 2 symbols, and control region #2 402 may be set to a control region length of 1 symbol.

In the control region in the above-described next-generation mobile communication system (5G or NR system), the base station provides higher layer signaling (e.g., system information, master information block (MIB), radio resource control (RRC) signaling) to the terminal. It can be set by doing. Setting a control region to a terminal means providing information such as a control region identifier, a frequency position of the control region, and a symbol length of the control region. For example, the setting of the control region may include information as shown in [Table 7] below.

In [Table 7], the tci-StatesPDCCH (hereinafter referred to as'TCI state') configuration information is one or more SS (Synchronization Signal)/PBCH in a QCL (Quasi Co Located) relationship with the DMRS transmitted from the corresponding control region. Information of a (Physical Broadcast Channel) block index or a CSI-RS (Channel State Information Reference Signal) index may be included.

5 is a diagram illustrating a structure of a downlink control channel of a next generation mobile communication system according to an embodiment of the present disclosure. That is, FIG. 5 is a diagram illustrating an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in 5G according to an embodiment of the present disclosure.

Referring to FIG. 5, a basic unit of time and frequency resources constituting a control channel may be defined as a Resource Element Group (REG) 503. The REG 503 may be defined as 1 OFDM symbol 501 on the time axis and 1 Physical Resource Block (PRB) 502 on the frequency axis, that is, 12 subcarriers. The base station may configure a downlink control channel allocation unit by concatenating the REG 503.

As shown in FIG. 5, when a basic unit to which a downlink control channel is allocated in 5G is a control channel element (CCE) 504, one CCE 504 may be composed of a plurality of REGs 503. For example, the REG 503 shown in FIG. 5 may be composed of 12 REs, and if 1 CCE 504 is composed of 6 REGs 503, 1 CCE 504 will be composed of 72 REs. I can. When a downlink control region is set, the corresponding region may be composed of a plurality of CCEs 504, and a specific downlink control channel is configured with one or more CCEs 504 according to an aggregation level (AL) within the control region. It can be mapped and transmitted. The CCEs 504 in the control area are classified by numbers, and in this case, the numbers of the CCEs 504 may be assigned according to a logical mapping method.

The basic unit of the downlink control channel shown in FIG. 5, that is, the REG 503 may include both REs to which DCI is mapped and a region to which the DMRS 505, which is a reference signal for decoding them, is mapped. As shown in FIG. 5, three DMRSs 505 may be transmitted in 1 REG 503. The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and the number of different CCEs indicates link adaptation of the downlink control channel. Can be used to implement. For example, when AL=L, one downlink control channel may be transmitted through L CCEs.

The UE needs to detect a signal without knowing the information on the downlink control channel, and a search space indicating a set of CCEs may be defined for blind decoding. The search space is a set of downlink control channel candidates (Candidates) consisting of CCEs to which the UE should attempt decoding on a given aggregation level. Since there are various aggregation levels that make one bundle with 1, 2, 4, 8, and 16 CCEs, the terminal may have a plurality of search spaces. The search space set may be defined as a set of search spaces at all set aggregation levels.

The search space may be classified into a common search space and a UE-specific search space. According to an embodiment of the present disclosure, terminals of a certain group or all terminals may examine a common search space of a PDCCH in order to receive cell-common control information such as dynamic scheduling or paging message for system information.

For example, the UE may receive PDSCH scheduling allocation information for transmission of SIB including cell operator information, etc. by examining the common search space of the PDCCH. In the case of a common search space, since a certain group of UEs or all UEs must receive a PDCCH, the common search space may be defined as a predetermined set of CCEs. Meanwhile, the UE may receive scheduling allocation information for UE-specific PDSCH or PUSCH by examining UE-specific search space of the PDCCH. The terminal-specific search space can be defined terminal-specifically as a function of the identity of the terminal and various system parameters.

In 5G, the parameter for the search space for the PDCCH may be set from the base station to the terminal by higher layer signaling (eg, SIB, MIB, RRC signaling). For example, the base station has the number of PDCCH candidates at each aggregation level L, a monitoring period for a search space, a monitoring occasion in a symbol unit in a slot for a search space, a search space type (common search space or a terminal-specific search space), The combination of the DCI format and RNTI to be monitored in the search space, and the control region index to monitor the search space can be set to the terminal. For example, the above-described setting may include information as shown in [Table 8] below.

The base station may set one or a plurality of search space sets to the terminal based on the configuration information. According to an embodiment of the present disclosure, the base station may set search space set 1 and search space set 2 to the terminal, and set to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space. In addition, DCI format B scrambled with Y-RNTI in search space set 2 may be set to be monitored in a UE-specific search space.

According to the setting information, one or a plurality of sets of search spaces may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be set as a common search space, and search space set #3 and search space set #4 may be set as a terminal-specific search space.

In the common search space, the combination of the following DCI format and RNTI can be monitored. Of course, it is not limited to the following examples.

-DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

-DCI format 2_0 with CRC scrambled by SFI-RNTI

-DCI format 2_1 with CRC scrambled by INT-RNTI

-DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

-DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

In the UE-specific search space, the combination of the following DCI format and RNTI may be monitored. Of course, it is not limited to the following examples.

-DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

-DCI format 1_0/1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

The specified RNTIs can follow the definitions and uses as follows.

C-RNTI (Cell RNTI): For UE-specific PDSCH scheduling

TC-RNTI (Temporary Cell RNTI): For UE-specific PDSCH scheduling

CS-RNTI (Configured Scheduling RNTI): For semi-statically configured UE-specific PDSCH scheduling

RA-RNTI (Random Access RNTI): For PDSCH scheduling in the random access phase

P-RNTI (Paging RNTI): PDSCH scheduling for paging transmission

SI-RNTI (System Information RNTI): For PDSCH scheduling in which system information is transmitted

INT-RNTI (Interruption RNTI): Used to inform whether PDSCH is pucturing

TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct the power control command for PUSCH

TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct the power control command for PUCCH

TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct the power control command for SRS

In one embodiment, the DCI formats described above may be defined as shown in [Table 9] below.

In one embodiment, the search space of the control region p in 5G and the aggregation level L in the search space set s may be expressed as [Equation 1] below.

[Equation 1]

값은 공통 탐색공간의 경우 0에 해당할 수 있다. In one embodiment,

The value may correspond to 0 in the case of a common search space.

값은 단말-특정 탐색공간의 경우, 단말의 신원(C-RNTI 또는 기지국이 단말에게 설정해준 ID)과 시간 인덱스에 따라 변하는 값에 해당할 수 있다.In one embodiment,

In the case of a terminal-specific search space, the value may correspond to a value that changes according to the identity of the terminal (C-RNTI or ID set by the base station to the terminal) and time index.

According to an embodiment of the present disclosure, in 5G, a plurality of search space sets may be set with different parameters (eg, parameters in Table 8). Accordingly, the set of search space sets monitored by the terminal may vary at each time point. For example, if search space set #1 is set to X-slot period, search space set #2 is set to Y-slot period, and X and Y are different, the terminal searches for search space set #1 in a specific slot. Both space set #2 can be monitored, and one of search space set #1 and search space set #2 can be monitored in a specific slot.

When a plurality of search space sets are set for the terminal, the following conditions may be considered in order to determine the search space set to be monitored by the terminal.

[Condition 1: Limit the maximum number of PDCCH candidates]

The number of PDCCH candidates that can be monitored per slot may not exceed M ^μ . M ^μ may be defined as the maximum number of PDCCH candidate groups per slot in a cell set to a subcarrier interval of 15·2 ^μ kHz, and may be defined as shown in Table 10 below.

[Condition 2: Limit the maximum number of CCEs]

The number of CCEs constituting the total search space per slot (here, the total search space may mean the entire CCE set corresponding to the union region of a plurality of search space sets) may not exceed C ^μ . C ^μ may be defined as the maximum number of CCEs per slot in a cell set to a subcarrier interval of 15·2 ^μ kHz, and may be defined as shown in [Table 11] below.

For convenience of explanation, a situation in which both conditions 1 and 2 are satisfied at a specific point in time may be exemplarily defined as “condition A”. Therefore, not satisfying the condition A may mean not satisfying at least one of the above-described conditions 1 and 2.

According to the settings of the search space sets of the base station, it may occur that condition A is not satisfied at a specific time point. When condition A is not satisfied at a specific time point, the terminal may select and monitor only a part of search space sets set to satisfy condition A at that time point, and the base station may transmit the PDCCH to the selected search space set.

According to an embodiment of the present disclosure, the following method may be followed as a method of selecting some search spaces from among the entire set of search spaces.

[Method 1]

If the condition A for the PDCCH is not satisfied at a specific point in time (slot),

The terminal (or the base station) may preferentially select a search space set in which a search space type is set as a common search space among search space sets existing at a corresponding time point over a search space set set as a terminal-specific search space.

When all search space sets set as common search spaces are selected (i.e., when condition A is satisfied even after selecting all search spaces set as common search spaces), the terminal (or base station) is a terminal-specific search space You can select the search space sets set to. In this case, when there are a plurality of search space sets set as a terminal-specific search space, a search space set having a low search space set index may have a higher priority. In consideration of the priority, the UE or the base station may select UE-specific search space sets within a range in which condition A is satisfied.

Hereinafter, a method of allocating time domain resources for a data channel in a next-generation mobile communication system (5G or NR system) will be described.

The base station provides a table for time domain resource allocation information for a downlink data channel (Physical Downlink Shared Channel, PDSCH) and an uplink data channel (Physical Uplink Shared Channel, PUSCH) to the UE, and higher layer signaling (e.g. For example, RRC signaling) can be set. For the PDSCH, a table consisting of maxNrofDL-Allocations=16 entries can be set, and for the PUSCH, a table consisting of maxNrofUL-Allocations=16 entries can be set. In one embodiment, the time domain resource allocation information includes PDCCH-to-PDSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, expressed as K0. ), PDCCH-to-PUSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), the PDSCH or PUSCH within the slot Information on the location and length of the scheduled start symbol, the PDSCH or PUSCH mapping type, and the like may be included. For example, information such as [Table 12] or [Table 13] below may be notified from the base station to the terminal.

The base station may notify the terminal of one of the entries in the table for time domain resource allocation information described above to the terminal through L1 signaling (for example, DCI) (for example, to be indicated by the'time domain resource allocation' field in the DCI. Can). The terminal may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

Hereinafter, a method of measuring and reporting a channel state in a next-generation mobile communication system (5G or NR system) will be described in detail.

Channel state information (CSI) includes Channel Quality Information (CQI), Precoding Matric Indicator (PMI), CSI-RS Resource Indicator (CRI), SS/PBCH Block Resource Indicator (SSBRI), Layer Indicator (LI), Rank Indicator (RI), and/or L1-RSRP (Reference Signal Received Power) may be included. The base station may control time and frequency resources for the above-described CSI measurement and reporting of the terminal.

For the above-described CSI measurement and reporting, the UE has N (≥1) CSI reporting settings (Setting) information (CSI-ReportConfig), M (≥1) RS transmission resources setting information (CSI-ResourceConfig) , One or two trigger state (CSI-AperiodicTriggerStateList, CSI-SemiPersistentOnPUSCH-TriggerStateList) list information may be set through higher layer signaling.

6 is a diagram for describing discontinuous reception (DRX) according to an embodiment of the present disclosure.

Discontinuous Reception (DRX) is an operation in which a terminal using a service receives data discontinuously in an RRC connected state in which a radio link is established between the base station and the terminal. When DRX is applied, the UE monitors the control channel by turning on the receiver at a specific point in time, and turns off the receiver when there is no data received for a certain period to reduce power consumption of the UE. DRX operation can be controlled by the MAC layer device based on various parameters and timers.

Referring to FIG. 6, the active time 605 is a time when the UE wakes up every DRX cycle and monitors the PDCCH. Active time 605 may be defined as follows.

-drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or ra-ContentionResolutionTimer is running; or

-a Scheduling Request is sent on PUCCH and is pending; or

-a PDCCH indicating a new transmission addressed to the C-RNTI of the MAC entity has not been received after successful reception of a Random Access Response for the Random Access Preamble not selected by the MAC entity among the contention-based Random Access Preamble

The drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer, etc. are timers whose values are set by the base station. Have.

The drx-onDurationTimer 615 is a parameter for setting the minimum time the terminal is awake in the DRX cycle. The drx-InactivityTimer 620 is a parameter for setting a time when the terminal is additionally awake when receiving 630 a PDCCH indicating new uplink transmission or downlink transmission. drx-RetransmissionTimerDL is a parameter for setting the maximum time the UE is awake in order to receive a downlink retransmission in a downlink HARQ procedure. drx-RetransmissionTimerUL is a parameter for setting the maximum time a UE is awake in order to receive an uplink retransmission grant in an uplink HARQ procedure. The drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, and drx-RetransmissionTimerUL may be set by, for example, time, number of subframes, number of slots, and the like. ra-ContentionResolutionTimer is a parameter for monitoring PDCCH in a random access procedure.

The inActive time 610 is a time set not to monitor the PDCCH during DRX operation or/or a time set not to receive the PDCCH, and the remaining time excluding the active time 605 from the total time during which the DRX operation is performed is inActive time It can be (610). If the UE does not monitor the PDCCH during the active time 605, it may enter a sleep or inActive state to reduce power consumption.

The DRX cycle refers to a period in which the UE wakes up and monitors the PDCCH. That is, after the UE monitors the PDCCH, it means a time interval or an on duration generation period until the next PDCCH is monitored. There are two types of DRX cycle: short DRX cycle and long DRX cycle. Short DRX cycle can be applied as an option.

The Long DRX cycle 625 is a long cycle among two DRX cycles set in the terminal. During the operation of Long DRX, the terminal starts the drx-onDurationTimer 615 again at a point in time when the Long DRX cycle 625 has elapsed from the start point (eg, start symbol) of the drx-onDurationTimer 615. The short DRX cycle will be described with reference to FIG. 7.

When operating in the Long DRX cycle 625, the UE may start the drx-onDurationTimer 615 in a slot after drx-SlotOffset in a subframe that satisfies [Equation 2] below. Here, drx-SlotOffset means a delay before starting the drx-onDurationTimer 615. drx-SlotOffset may be set by, for example, time, number of slots, and the like.

[Equation 2]

[(SFN Х 10) + subframe number] modulo (drx-LongCycle) = drx-StartOffset

At this time, drx-LongCycleStartOffset may be used to define a subframe to start a Long DRX cycle 625 and drx-StartOffset may be used to start a Long DRX cycle 625. drx-LongCycleStartOffset may be set by, for example, time, number of subframes, number of slots, and the like.

7 is a diagram for describing Long DRX and Short DRX according to an embodiment of the present disclosure.

Referring to FIG. 7, a short DRX cycle 705 is a short cycle among two DRX cycles defined in a terminal. When the UE operates in the Long DRX cycle 625 and receives 630 a predetermined event, for example, a PDCCH indicating new uplink transmission or downlink transmission at the active time 605, It starts or restarts the drx-InactivityTimer (620), and operates with a short DRX cycle (705). More specifically, the terminal starts the drx-ShortCycleTimer 710 at the expiration of the previous drx-onDurationTimer 615 or the drx-InactivityTimer 620, and operates in a short DRX cycle until the drx-ShortCycleTimer 710 expires. The drx-ShortCycleTimer can be started or restarted by the MAC CE (control element) indicated by the base station. When the UE receives 630 a PDCCH indicating new uplink transmission or downlink transmission, it extends the Active Time 605 in anticipation of additional uplink transmission or downlink transmission in the future, or the InActive Time 610 It can delay the arrival. While operating in short DRX, the terminal starts the drx-onDurationTimer 615 again when the short DRX cycle has elapsed from the starting point of the previous on duration. Thereafter, when the drx-ShortCycleTimer 710 expires, the terminal operates in a Long DRX cycle 625 again.

When operating in the short DRX cycle 705, the terminal may start the drx-onDurationTimer 615 after drx-SlotOffset in a subframe satisfying [Equation 3] below. Here, drx-SlotOffset means a delay before starting the drx-onDurationTimer 615. drx-SlotOffset may be set by, for example, time, number of slots, and the like.

[Equation 3]

[(SFN Х 10) + subframe number] modulo (drx-ShortCycle) = (drx-StartOffset) modulo (drx-ShortCycle)

Here, drx-ShortCycle and drx-StartOffset may be used to define a subframe to start the Short DRX cycle (705). The drx-ShortCycle and drx-StartOffset may be set by, for example, time and the number of subframes.

In a next-generation mobile communication system (5G or NR system), in order to reduce the power consumption of the terminal, various transmission/reception related parameters may be adjusted by L1 (Layer 1) signaling. For example, the L1 signaling for the purpose of reducing power consumption of the UE described above may control at least one or a combination of one or more of the parameters shown in Table 14 below.

Of course, it is not limited to the above example, and in the following disclosure, various parameters and information that may be included in the transmitted L1 signal for the purpose of reducing power consumption will be further described.

According to an embodiment of the present disclosure, the L1 signal transmitted for the purpose of reducing power consumption of the terminal described above may be referred to as a power saving signal (POSS). Of course, it is not limited to the above example, and the power saving signal may be expressed by various names such as a power control signal and a power setting signal.

In addition, according to an embodiment of the present disclosure, the power saving signal (POSS) is a power saving signal (eg, Wake Up Signal or uni-POSS) monitored by the terminal at the inActive time and a power saving signal monitored at the active time ( For example, it may mean including all of Go To Sleep Signal or uni-POSS).

The present disclosure below proposes a method of setting a power saving signal and operating a base station and a terminal according thereto. For example, in the following disclosure, the types of power saving signals, DCI structures corresponding to the power saving signals, DCI contents (information, parameters) corresponding to the power saving signals, a method of monitoring the power saving signals, and the power saving signals. According to a method for monitoring a PDCCH of a terminal according to, a change of a monitoring setting of a PDCCH of a terminal according to a power saving signal, an operation when a power saving signal is not received, and the like are proposed. Power consumption of the terminal according to PDCCH monitoring may be minimized through the power saving signal proposed in the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with the accompanying drawings. Hereinafter, an embodiment of the present disclosure will be described as an example of a 5G system, but the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, other communication systems having a similar technical background or channel type may include LTE or LTE-A mobile communication and mobile communication technology developed after 5G. Accordingly, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure, as determined by a person having skilled technical knowledge.

In addition, in describing the present disclosure, when it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

<First Example>

As described above, the configuration information of the power saving signal may be provided by the base station to the terminal through higher layer signaling (RRC signaling, MIB, SIB). The terminal may detect a DCI corresponding to the power saving signal by monitoring the PDCCH based on the configuration information of the power saving signal provided by the base station.

In the following first embodiment, a case in which the power saving signal provided in the active time and the power saving signal provided in the inActive time are different from each other will be described. More specifically, according to an embodiment of the present disclosure, the base station may be configured to detect a DCI corresponding to a different power saving signal, respectively, in an active time and an inactive time of the terminal.

Referring to FIG. 8, the terminal may detect a first (1st) type of DCI 810 at an inActive time, and a second (2nd) type of DCI 820 at an active time 870. That is, the UE can detect the first (1st) type of DCI 810 by monitoring the PDCCH at the inActive time, and the second (2nd) type of DCI 820 by monitoring the PDCCH at the active time 870. I can. According to an embodiment of the present disclosure, the meaning that the types are different may mean at least one of a case where a format of a DCI is different or a Radio Network Temporary Identifier (RNTI) used for scrambling of a DCI is different.

According to an embodiment of the present disclosure, a time period in which the terminal wakes up and monitors the PDCCH may be referred to as an active time 870, and a time other than the active time 870 is referred to as an inActive time.

According to an embodiment of the present disclosure, a first type of DCI 810 may be set to have a first period 830 and a second type of DCI 820 may be set to have a second period 840 have. The terminal may perform monitoring based on the set period. The first period 830 and the second period 840 may be the same or different. Also, the first period 830 and the second period 840 may be set to be related to each other. For example, the first period 830 may be set to a predetermined multiple of the second period 840 or an equation, and vice versa. Of course, it is not limited to the above example, and the first period 830 and the second period 840 may be set independently.

According to an embodiment of the present disclosure, a specific time period in which the DCI corresponding to the power saving signal can be received is referred to as an occasion, and the period of the DCI corresponding to the power saving signal is referred to as the period of the occasion or the power saving signal. It may include all the monitoring cycles to detect the DCI. The setting of the period of the first type of DCI 810 and the second type of DCI 820 will be described in more detail with reference to the third and fourth embodiments.

In addition, the first type of DCI 810 may be set to have a first offset 850, and the second type of DCI 820 may be set to have a second offset 860. The terminal may perform monitoring based on the set offset. Also, the first offset 850 and the second offset 860 may be set to be related to each other. For example, the first offset 850 may be set to a predetermined multiple of the second offset 860 or an equation, and vice versa. Of course, it is not limited to the above example, and the first offset 850 and the second offset 860 may be set independently. The offset may mean a position or time difference from a reference point or a reference point to a predetermined point or point of time. The setting of the offset of the DCI 810 of the first type and the DCI 820 of the second type will be described in more detail through the third and fourth embodiments. According to an embodiment of the present disclosure, the offset may be referred to as a start offset, and hereinafter, it is referred to as an offset for convenience of description.

According to an embodiment of the present disclosure, the first type of DCI 810 may be referred to as GTS (Go to Sleep). Of course, it is not limited to the above example, and the DCI corresponding to the power saving signal detected by the UE through monitoring of the PDCCH at the active time may be referred to as a PDCCH adaptation signal, or as a power saving signal (POSS). It may be called, it may be called a power saving command, it may be called a power control signal (Power Control Signal), it may be called an onduration timer deactivation signal (OndurationTimer Deactivation Signal). That is, there is no restriction on the name of the DCI corresponding to the power saving signal detected by the terminal through monitoring in the active time. Hereinafter, for convenience of description, the DCI corresponding to the power saving signal detected by the terminal through monitoring at the active time is referred to as GTS.

According to an embodiment of the present disclosure, the second type of DCI 820 may be referred to as a Wake Up Signal (WUS). Of course, it is not limited to the above example, and the DCI corresponding to the power saving signal detected by the terminal through monitoring at the inActive time is a power control signal, a DRX activation signal, and an on-duration activation signal ( On Duration Activation Signal) or on Duration Timer Activation Signal. That is, there is no restriction on the name of the DCI corresponding to the power saving signal detected by the terminal through monitoring at the inActive time. Hereinafter, for convenience of description, the DCI corresponding to the power saving signal detected by the terminal through monitoring at the active time is referred to as WUS.

According to an embodiment of the present disclosure, the GTS and the WUS may be different DCIs, and the content (or information, parameters) included in each DCI may be different.

<Example 1-1>

According to an embodiment of the present disclosure, WUS and GTS may have different DCI formats. For example, WUS may be DCI format A, and GTS may be DCI format B. In one embodiment, DCI formats A and B may be newly defined DCI formats different from existing DCI formats (eg, DCI formats 0_0, 0_1, 1_0, 1_1, 2_0, 2_1, 2_2, 2_3), It may be an existing DCI format.

<Example 1-2>

According to an embodiment of the present disclosure, WUS and GTS may be scrambled with different RNTIs, respectively. Specifically, WUS may be scrambling with WUS-RNTI, and GTS may be scrambled with GTS-RNTI. Of course, the name of the RNTI scrambling WUS and GTS is not limited to the above example, and may be referred to as POSS-RNTI or PS-RNTI. The RNTI scrambling the WUS and GTS may be a newly defined RNTI, or an existing RNTI may be used.

The UE may receive WUS assuming that it is scrambled with WUS-RNTI and GTS is scrambled with GTS-RNTI. That is, WUS can be de-scrambling with WUS-RNTI, and GTS can be de-scrambling with GTS-RNTI. The RNTI scrambling the WUS and the GTS will be described in more detail through the third and fourth embodiments.

In addition, according to an embodiment of the present disclosure, when DRX is configured in the terminal, the PDCCH monitoring operation for the WUS-RNTI and the GTS-RNTI of the terminal may be different from each other. For example, the UE can always perform the PDCCH monitoring operation for the DCI format scrambled with WUS-RNTI, regardless of the DRX active time or the DRX inactive time. According to an embodiment of the present disclosure, the PDCCH monitoring operation for WUS-RNTI may be performed based on a search space setting (or setting for a monitoring occasion for WUS) set in the terminal.

In addition, according to an embodiment of the present disclosure, the terminal may perform the PDCCH monitoring operation for the DCI format scrambled with WUS-RNTI only at the DRX inactive time. At this time, the PDCCH monitoring operation for WUS-RNTI is performed for monitoring occasions existing in the DRX inactive time area among WUS monitoring occasions based on the search space setting (or setting for the monitoring occasion for WUS) set in the terminal. Can be.

The UE may perform the PDCCH monitoring operation for the DCI format scrambled with GTS-RNTI only at DRX Active time. At this time, the PDCCH monitoring operation for GTS-RNTI is performed for monitoring occasions existing in the DRX Active time area among GTS monitoring occasions based on the search space setting (or setting for the monitoring occasion for GTS) set in the terminal. Can be. Alternatively, the same operation can be expressed as follows.

-The MAC entity may be configured by RRC with a DRX functionality that controls the UE's PDCCH monitoring activity for the MAC entity's GTS-RNTI, C-RNTI, CS-RNTI, INT-RNTI, SFI-RNTI, SP-CSI-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, and TPC-SRS-RNTI. When using DRX operation, the MAC entity shall also monitor PDCCH according to requirements found in other subclauses of this specification. When in RRC_CONNECTED, if DRX is configured, for all the activated Serving Cells, the MAC entity may monitor the PDCCH discontinuously using the DRX operation specified in this subclause; otherwise the MAC entity shall monitor the PDCCH continuously.

<Example 1-3>

The next-generation mobile communication system (5G or NR system) may limit the number of DCIs having different sizes monitored by the terminal to a specific number or less in order to reduce the complexity of the DCI decoding of the terminal. For example, a next-generation mobile communication system (5G or NR system) can always satisfy both of the following two conditions. Of course, it is not limited to the above example.

[Condition 1]

-The UE can monitor up to X DCIs of different sizes per slot (eg, X=4).

[Condition 2]

-The UE can monitor a maximum of Y DCIs having different sizes per slot for a specific RNTI. For example, a specific RNTI may mean C-RNTI, CS-RNTI, MCS-C-RNTI, or other terminal-specific RNTI (eg, Y=3).

According to an embodiment of the present disclosure, the base station may appropriately adjust the DCI size to satisfy [Condition 1] and [Condition 2] described above. The UE may not expect to set a DCI size that does not satisfy [Condition 1] and [Condition 2] described above. The size of the frequency axis resource allocation field of the DCI format 0_0/1_0 monitored in the UE-specific search space may be determined as the size of the currently active bandwidth portion. However, if the size of the DCI format 0_0/1_0 monitored in the terminal-specific search space is determined as the size of the currently active bandwidth portion, and the above-described DCI size limitation condition is not satisfied, the DCI format 0_0/1_0 The size of the frequency axis resource allocation field may be determined by the size of the initial bandwidth portion. That is, the size of the DCI format 0_0/1_0 monitored in the common search space and the size of the DCI format 0_0/1_0 monitored in the UE-specific search space become the same, so that the number of DCIs having different sizes can be reduced.

According to an embodiment of the present disclosure, WUS and GTS may have different DCI sizes. Specifically, the sizes of the frequency axis resource allocation fields of the WUS 810 and the GTS 820 may be different from each other. Referring to FIG. 9, the WUS 810 may be set to be smaller than the GTS 820. Of course, it is not limited to the above example, and the WUS 810 may be set to be larger than the GTS 820.

In addition, referring to FIG. 9, the GTS 820 may have a size corresponding to an existing DCI format (eg, DCI format 0_0/1_0), and the WUS 810 may have a conventional DCI format (eg, DCI format 0_0/1_0) may have a different size. The size of the frequency axis resource allocation field of DCI format 0_0/1_0 may be determined by the size of the currently active bandwidth part, but is not limited to the above example.

According to an embodiment of the present disclosure, since the GTS 820 is transmitted at an active time, it may be set to have the same size as other DCI 930 formats (eg, DCI format 0_0/1_0, etc.) I can. In order to align the size of the transmitted DCI, 0 can be inserted (Zero-padding) when the GTS 820 is smaller in size than other DCI 930 formats, and the GTS 820 is more than the other DCI 930 formats. When the size is large, bits corresponding to some fields may be removed (Truncation). Alternatively, when the above-described condition 1 or condition 2 is not satisfied, the size of the GTS 820 may be arranged to have the same size as other DCI 930 formats (eg, DCI format 0_0/1_0, etc.). .

In addition, according to an embodiment, since the WUS 810 is transmitted at the inActive time, it may be set to have the same size as other DCI 930 formats. Even if the above-described condition 1 or condition 2 is not satisfied, the size of the WUS 810 may not be aligned to have the same size as other DCI 930 formats (eg, DCI format 0_0/1_0, etc.).

Alternatively, when the WUS 810 does not satisfy the above-described condition 1 or 2, the size of the WUS 810 has the same size as other DCI 930 formats (eg, DCI format 0_0/1_0, etc.). Can be arranged to The WUS 810 may also align the size by inserting 0 or removing bits corresponding to some fields. By aligning the sizes of the WUS 810 and the GTS 820, power of the terminal can be saved by reducing the number of blind decoding for the search space of the terminal.

<Example 1-4>

As described above, the base station may transmit the WUS 810 and the GTS 820 to the terminal. In addition, the base station may set a control region and a search space for transmitting WUS and GTS to the terminal to the terminal.

Referring to FIG. 10, the control area 1000 for transmitting the WUS 810 and the GTS 820 set by the base station to the terminal is a control area set by MIB (control area with a control area ID of 0 or control area # 0), or may be a control region set by higher layer signaling (eg, MIB, SIB, RRC signaling, etc.).

Also, according to an embodiment of the present disclosure, the control region 1000 for transmitting the WUS 810 and the GTS 820 set by the base station to the terminal may exist only in a specific bandwidth part. The specific bandwidth part may be an initial bandwidth part set as SIB, a default bandwidth part or a bandwidth part set by a base station among bandwidth parts set as higher layer signaling, and may exist in each bandwidth part. . Further, according to an embodiment of the present disclosure, the control region 1000 for transmitting the WUS 810 and the GTS 820 may be the same or different.

Also, the base station may set a search space 602 for transmitting the WUS 810 and the GTS 820 to the terminal through higher layer signaling. For example, the base station has parameters for the search space described in [Table 8] (ie, the monitoring period and offset per slot, monitoring occasion per symbol, the number of PDCCH candidates for each AL, search space type, DCI format) Etc.) can be set to the terminal.

For example, the base station may set a search space for transmitting the WUS 810 and the GTS 820 as a common search space (CSS), or a group common search space (GCSS). It may be set, it may be set to a UE-specific search space (USS), and may be set to at least one of CSS, GCSS, and USS. The terminal may monitor the WUS 810 and the GTS 820 in the set search space.

When the base station sets the search space for transmitting the WUS 810 and the GTS 820 to CSS, Y_(p,n ^μ _s,f ) among the parameters determining the search space may be 0, and CSS or GCSS When set to, Y_(p,n ^μ _s,f ) may be a value corresponding to a group common RNTI (eg, GC-RNTI), and when set to USS, Y_(p,n ^μ _s,f ) The value may be a value that changes according to the identity of the terminal (C-RNTI or an ID set by the base station to the terminal) and a time index.

Referring to FIG. 10, a search space 1002 for transmitting a WUS 810 and a GTS 820 may be different. Of course, it is not limited to the above example, and the search space 1002 for transmitting the WUS 810 and the GTS 820 may be the same. The terminal may monitor the WUS 810 and the GTS 820 based on the search space 1002 set by the base station.

<Example 1-5>

According to an embodiment of the present disclosure, when different DCI formats have the same size and/or RNTI, the base station may transmit a DCI including identification information in order to facilitate the identification of the DCI format by the terminal.

Referring to FIG. 11, identification information 1110 for distinguishing DCI formats may be included in the WUS 810 and the GTS 820. Identification information 1110 for distinguishing the DCI format of FIG. 10 may be information for identifying whether it is the WUS 810 or the GTS 820, or for identifying the DCI format of each of the WUS 810 and the GTS 820 It could be information. Of course, it is not limited to the above example.

In addition, the identification information 1110 for distinguishing the DCI format may be 1 bit or a plurality of bits, and is not limited to the above example.

The above-described embodiments of the WUS 810 and the GTS 820 are all independent, and each of the embodiments may be combined. For example, the DCI size of the WUS 810 and the GTS 820 may be the same or different, the formats of the WUS 810 and the GTS 820 may be the same or different, and the WUS 810 ) And the RNTI scrambling the GTS 820 may be the same or different, and the control regions in which the WUS 810 and the GTS 820 are set to be monitored may be the same or different, and the search space may also be the same. It may be different, and identification information 1110 for distinguishing the DCI format may or may not be included in the WUS 810 and the GTS 820, respectively.

A method of controlling the respective settings of the GTS 820 and WUS 810 and the PDCCH monitoring setting will be described in more detail through the following third and fourth embodiments.

<Second Example>

As described above, the configuration information on the power saving signal may be provided by the base station to the terminal through higher layer signaling (RRC signaling, MIB, SIB). The terminal may detect a DCI corresponding to the power saving signal by monitoring the PDCCH based on configuration information about the power saving signal provided by the base station.

In the following second embodiment, a method for a terminal to monitor the same power saving signal at an active time and an inactive time is proposed. More specifically, according to an embodiment of the present disclosure, the base station may be configured to detect a DCI corresponding to the same type of power saving signal at an active time and an inactive time of the terminal.

Referring to FIG. 12, a terminal may detect a DCI 1210 corresponding to a power saving signal of the same type at an inActive time and an active time 1270. The DCI 1210 corresponding to the power saving signal detected by the UE monitoring the PDCCH at the inactive time and the active time 1270 may be referred to as a uni-POSS (Unified Power Saving Signal) 1210. According to an embodiment of the present disclosure, the meaning of the same type may mean at least one of a case in which the format of the DCI is the same or the Radio Network Temporary Identifier (RNTI) used for scrambling of the DCI is the same.

Of course, the name of the DCI 1210 corresponding to the power saving signal that the terminal monitors and detects in the inActive time and the active time 1270 is not limited to the above example, and may be called a PDCCH Adaptation Signal or POSS. , It can be called Power Saving Command, Power Control Signal, or WUS or GTS. That is, there is no limitation on the name of the DCI 1210 corresponding to the power saving signal monitored and detected by the inActive time and the active time 1270. Hereinafter, for convenience of description, the DCI corresponding to the power saving signal monitored and detected by the terminal at the inActive time and the Active time 1270 is referred to as uni-POSS 1210.

<Example 2-1>

According to an embodiment of the present disclosure, the uni-POSS 1210 may be set to have a predetermined period 1230. In other words, the uni-POSS 1210 may be transmitted at a predetermined occasion period. Occasion may mean a specific time interval in which DCI is transmitted.

The terminal may perform monitoring based on the set period. In addition, according to an embodiment, the period of the uni-POSS 1210 at the active time 1270 and the period at the inActive time may be the same or different. In addition, the period of the uni-POSS 1210 may be set to one period regardless of the period in the active time 1270 and the inActive time.

In addition, the period in the active time 1270 and the period in the inActive time of the uni-POSS 1210 may be set to be related to each other. The period at the active time 1270 of the uni-POSS 1210 may be set to a predetermined multiple or an equation of the period at the inActive time, and vice versa.

Also, according to an embodiment of the present disclosure, the uni-POSS 1210 may be set to have a predetermined offset 1250. The terminal may perform monitoring based on the set offset 1250. The offset 1250 at the active time 1270 of the uni-POSS 1210 and the offset 1250 at the inActive time may be the same or different. Also, the offset 1250 of the uni-POSS 1210 may be set as one offset 1250 regardless of the active time 1270 and the inActive time.

In addition, the offset 1250 at the active time 1270 of the uni-POSS 1210 and the offset 1250 at the inActive time may be set to be related to each other. The offset 1250 at the active time 1270 of the uni-POSS 1210 may be set to a predetermined multiple or an expression of the offset 1250 at the inActive time, and vice versa. Of course, it is not limited to the above example.

In addition, according to an embodiment of the present disclosure, the period and offset at the inActive time of the uni-POSS 1210 may be set in the same manner as the WUS, and the inActive time of the uni-POSS 1210 is the same as the active time. It can also be set. This will be described in more detail in the third and fourth embodiments.

In addition, according to an embodiment of the present disclosure, it may be set to have the same period and offset in the inActive time and the active time of the uni-POSS 1210.

<Example 2-2>

According to an embodiment of the present disclosure, uni-POSS may be a newly defined DCI format different from existing DCI formats (eg, DCI formats 0_0, 0_1, 1_0, 1_1, 2_0, 2_1, 2_2, 2_3) have. Further, according to an embodiment of the present disclosure, uni-POSS may be a conventional DCI format. The UE may be configured to detect uni-POSS having a single DCI format at inActive time and Active time by the base station.

<Example 2-3>

According to an embodiment of the present disclosure, uni-POSS may be scrambled with Power Saving (PS)-RNTI. Of course, the name of the RNTI scrambling uni-POSS is not limited to the above example, and may be referred to as POSS-RNTI. In addition, the RNTI scrambling the uni-POSS may be a newly defined RNTI, or an existing RNTI may be used. The UE may receive the assumption that uni-POSS is scrambled with PS-RNTI. That is, uni-POSS can be descrambled with PS-RNTI.

<Example 2-4>

The next-generation mobile communication system (5G or NR system) may limit the number of DCIs having different sizes monitored by the terminal to a specific number or less in order to reduce the complexity of the DCI decoding of the terminal. For example, a next-generation mobile communication system (5G or NR system) can always satisfy both of the following two conditions.

[Condition 1]

-The UE can monitor up to X DCIs of different sizes per slot (eg, X=4).

[Condition 2]

-The UE can monitor a maximum of Y DCIs having different sizes per slot for a specific RNTI. For example, a specific RNTI may mean C-RNTI, CS-RNTI, MCS-C-RNTI, or other terminal-specific RNTI (eg, Y=3).

The base station may appropriately adjust the DCI size to satisfy [Condition 1] and [Condition 2] described above. The UE may not expect to set a DCI size that does not satisfy [Condition 1] and [Condition 2] described above. The size of the frequency axis resource allocation field of the DCI format 0_0/1_0 monitored in the UE-specific search space may be determined as the size of the currently active bandwidth portion. However, if the size of the DCI format 0_0/1_0 monitored in the terminal-specific search space is determined as the size of the currently active bandwidth portion, and the above-described DCI size limitation condition is not satisfied, the DCI format 0_0/1_0 The size of the frequency axis resource allocation field may be determined by the size of the initial bandwidth portion. That is, the size of the DCI format 0_0/1_0 monitored in the common search space and the size of the DCI format 0_0/1_0 monitored in the UE-specific search space become the same, so that the number of DCIs having different sizes can be reduced.

According to an embodiment of the present disclosure, uni-POSS may have a size corresponding to an existing DCI format (eg, DCI format 0_0/1_0). For example, since uni-POSS is transmitted at an active time, it may be set to have the same size as other DCI formats (eg, DCI format 0_0/1_0, etc.) transmitted together. In order to align the size of the transmitted DCI, 0 can be inserted (Zero-padding) when the size of uni-POSS is smaller than that of other DCI formats. When the size of uni-POSS is larger than that of other DCI formats, some fields and The corresponding bit can be removed (Truncation). According to an embodiment of the present disclosure, by aligning the sizes of the uni-POSS 1210, the number of blind decoding for the search space of the terminal can be reduced, thereby saving power of the terminal.

In addition, according to an embodiment of the present disclosure, when the above-described condition 1 or condition 2 is not satisfied, the size of the uni-POSS may have the same size as other DCI formats (eg, DCI format 0_0/1_0, etc.). Can be aligned.

In addition, according to an embodiment of the present disclosure, when the above-described condition 1 or condition 2 is not satisfied, the size of uni-POSS is the same as other DCI formats (eg, DCI format 0_0/1_0, etc.) only at the active time. They are aligned to have a size, and may not be aligned with other DCI formats at the inactive time.

Of course, it is not limited to the above example, and the uni-POSS 1210 may have the same size as the existing DCI format (e.g., DCI format 0_0/1_0) regardless of whether conditions are satisfied or whether active time/inActive time And may have different sizes.

<Example 2-5>

According to an embodiment, uni-POSS may include various contents (information, parameters). In addition, as described above, uni-POSS may be transmitted using a new DCI format or may be transmitted using an existing DCI format. Hereinafter, contents included in uni-POSS will be described. As described above, uni-POSS may include at least one or a combination of one or more of the parameters as shown in [Table 15] below, and may be used to instruct the terminal to content based on the included parameters and to control the terminal. .

According to an embodiment of the present disclosure, uni-POSS may instruct to perform PDCCH monitoring. More specifically, the base station may transmit uni-POSS to the terminal, and the terminal may perform monitoring on the PDCCH from a point in time after detecting the uni-POSS. For example, the UE in the inActive state may switch to the Active state in order to monitor the PDCCH from a predetermined point after detecting uni-POSS. According to an embodiment of the present disclosure, information indicating a state change of a terminal may be included in the uni-POSS.

According to an embodiment of the present disclosure, uni-POSS may indicate that PDCCH monitoring is not performed. More specifically, the base station may transmit uni-POSS to the terminal, and the terminal may not perform monitoring on the PDCCH for a specific time from a point in time after detecting the uni-POSS. For example, a terminal in an active state may switch to an inActive state (eg, a power saving mode or a sleep mode) without performing monitoring on the PDCCH from a predetermined point after detecting uni-POSS.

In addition, the uni-POSS 1210 may instruct to change configuration information for PDCCH monitoring. Here, the configuration information for the PDCCH may include at least one of the parameters for the control region of [Table 7] and/or at least one of the parameters for the search space of [Table 8]. The base station can transmit uni-POSS to the terminal, and the terminal can monitor the PDCCH by applying the PDCCH configuration information indicated by the uni-POSS from the time point after detecting the uni-POSS 1210.

In addition, the information included in the uni-POSS 1210 is not limited to [Table 15], and may include at least one of various parameters as described in [Table 14], and content based on the included parameters is And can be used to control the terminal. In addition, the terminal receiving the uni-POSS may control the transmission/reception parameter based on the configuration information indicated by the uni-POSS from the point after detecting the uni-POSS.

According to an embodiment of the present disclosure, the content of the uni-POSS 1210 transmitted at the active time 1270 may correspond to the content of the GTS, and the content of the uni-POSS 1210 transmitted at the inActive time is WUS. It may correspond to the content.

Referring to FIG. 13, a first table 1310 may be content (information, parameter) corresponding to GTS, and a second table 1320 may be content (information, parameter) corresponding to WUS. The base station determines whether the uni-POSS 1210 is transmitted to be monitored and detected at the active time 1270 or transmitted to be monitored and detected at the inActive time, and then the first table 1310 or the second table 1320 The contents of can be transmitted to the terminal using the integrated DCI format.

Of course, it is not limited to the above example, and the contents of the uni-POSS 1210 may always include all contents included in the GTS and WUS. Details of the content that may be included in the uni-POSS 1210 will be described in more detail in the GTS content and the WUS embodiment.

<Example 2-6>

According to an embodiment, the base station may transmit uni-POSS to the terminal. In addition, the base station may set a control region and a search space for transmitting uni-POSS to the terminal to the terminal. The terminal may detect uni-POSS by performing monitoring according to the set control area and search space and the set uni-POSS occasion.

The control region for transmitting the uni-POSS set by the base station to the terminal may be a control region set with MIB (control region with a control region ID of 0 or control region #0), and higher layer signaling (e.g. MIB, SIB, It may also be a control region set by RRC signaling, etc.).

Also, the control region for transmitting the uni-POSS 1210 set by the base station to the terminal may exist only in a specific bandwidth part. The specific bandwidth part may be an initial bandwidth part set as SIB, a default bandwidth part or a bandwidth part set by a base station among bandwidth parts set as higher layer signaling, and may exist in each bandwidth part. .

In addition, the base station may set a search space for transmitting the uni-POSS 1210 to the terminal through higher layer signaling. For example, the base station has parameters for the search space described in [Table 8] (ie, the monitoring period and offset per slot, monitoring occasion per symbol, the number of PDCCH candidates for each AL, search space type, DCI format) Etc.) can be set to the terminal.

<Example 2-6-1>

According to an embodiment, the base station may set up one search space for transmitting the uni-POSS 1210 to the terminal.

Referring to FIG. 14, the terminal may monitor one search space 1420 set either at an active time 1270 or an inactive time. In addition, the base station can set the duration 1430 for the terminal to search for uni-POSS in the search space, and the terminal can monitor one set of search spaces for a set duration 1430, either at the active time (1270) or at the inActive time. .

According to an embodiment of the present disclosure, the terminal may perform monitoring at inActive time by monitoring one search space 1420 set based on the set duration 1430.

In addition, referring to FIG. 14, the base station may set a first period 1440, which is a period in which the duration 1430 to monitor the uni-POSS is repeated to the terminal. In addition, the base station may set a second period 1450 which is a period of the occasion 1410 of uni-POSS within the duration 1430 set to the terminal. For example, the terminal may monitor one search space 1420 set every second period 1450 for a duration 1430 set every set first period 1440.

According to an embodiment of the present disclosure, the second period 1450 in the inActive time and the second period 1450 in the active time 1270 may be the same or different.

The UE may monitor the occasion 1410 of one or more uni-POSSs within the configured duration 1430 at inActive time. At this time, the uni-POSS occasion 1410 that can be monitored at the inactive time may be set by the base station or may be determined as an occasion 1410 existing in a time domain corresponding to a specific offset in the DRX Active time.

<Example 2-6-2>

According to an embodiment, the base station may set one or more search spaces for transmitting uni-POSS to the terminal.

Referring to FIG. 15, the terminal may monitor search space #1 (1520) at an active time (1270), and monitor search space #2 (1530) at an inActive time. In addition, the setting information of the search space may include a parameter for setting whether the search space is a search space corresponding to an active time 1270 or a search space corresponding to an inActive time.

In addition, referring to FIG. 15, the base station may set a first period 1540, which is a period of a uni-POSS occasion 1410 in search space #1 1520, to the UE. The terminal may detect uni-POSS by monitoring the search space #1 1520 every first period 1540 set in the active time 1270.

In addition, referring to FIG. 15, the base station may set a second period 1550, which is a period of a uni-POSS occasion 1410 in search space #2 1530 to the UE. The terminal may detect uni-POSS by monitoring the search space #2 1530 every second period 1550 set in the inActive time.

According to an embodiment of the present disclosure, the period may be the same or different for each search space.

The above-described embodiments of uni-POSS are all independent, and each of the embodiments may be combined. For example, the DCI format of uni-POSS may be an existing format or a newly defined format, and the DCI size may or may not be aligned, and the contents of uni-POSS transmitted at inactive time and Contents of uni-POSS transmitted in active time may be the same or different, and there may be one or a plurality of search spaces in which uni-POSS is transmitted.

In addition, according to an embodiment of the present disclosure, settings (e.g., offset, period, when uni-POSS is not received, uni-POSS indication unit, mapping), etc. are set to the following WUS or GTS. It may correspond to that described in. Specifically, in the uni-POSS 1210, the period of the occasion may be set and detected in a manner corresponding to the WUS at the inActive time, and the UE may control the PDCCH monitoring method in the same manner as when WUS is received. have. In addition, in the active time, the period of the occasion may be set in a manner corresponding to the GTS, and may be set to be detected, and the UE may control the PDCCH monitoring method in the same manner as when the GTS is received.

Of course, it is not limited to the above example, and uni-POSS may be set to be monitored and detected in a manner corresponding to one of WUS or GTS regardless of inActive time and Active time, and some settings of WUS and some settings of GTS are It can also be set by combining. That is, uni-POSS can follow the settings of WUS or GTS except for the setting that DCI of the same format is used in inActive time and Active time, and thus detailed description thereof will be omitted.

Hereinafter, the GTS and WUS will be described in more detail through the third and fourth embodiments.

<Third Example>

As described above, the GTS may be a power saving signal monitored by the terminal at the active time 1670. The GTS may be a predetermined DCI provided through the PDCCH. The terminal may receive the GTS and perform various power saving operations based on the received GTS. Hereinafter, the contents (information, parameters) in the GTS, a period, an offset, an operation method for a case where the GTS is not received, a unit group in which the GTS is transmitted, and a method for controlling PDCCH monitoring of a terminal using the GTS will be described in detail.

<Example 3-1>

According to an embodiment, the GTS may include various contents (information, parameters). Also, as described above, the GTS may be transmitted using a new DCI format or may be transmitted using an existing DCI format. Hereinafter, contents included in the GTS will be described. As described above, the GTS may include at least one or a combination of one or more of the parameters as shown in Table 16 below, and may be used to indicate content based on the included parameters and to control the terminal.

For example, the GTS may indicate not to perform PDCCH monitoring. More specifically, the base station may transmit the GTS to the terminal, and the terminal may not perform monitoring on the PDCCH for a specific time from a point after detecting the GTS.

In addition, the GTS may instruct to change configuration information for PDCCH monitoring. Here, the configuration information for the PDCCH may include at least one of the parameters for the control region of [Table 7] and/or at least one of the parameters for the search space of [Table 8]. The base station can transmit the GTS to the terminal, and the terminal can monitor the PDCCH by applying the PDCCH configuration information indicated by the GTS from the time point after detecting the GTS.

In addition, the information included in the GTS is not limited to Table 15, and may include at least one of various parameters as described in [Table 14], and may be used to indicate content based on the included parameters and control the terminal. I can. In addition, the terminal receiving the GTS may control the transmission/reception parameter based on the setting information indicated by the GTS from a time point after the GTS is detected. Also, according to an embodiment of the present disclosure, parameters included in the WUS may or may not be included in the GTS.

In addition, according to an embodiment of the present disclosure, the GTS may instruct a state change of the terminal. Specifically, the terminal receiving the GTS may terminate the On duration. That is, the terminal may switch from the active state to the inactive state by terminating the on duration. The active state may correspond to an active time, which is a time when the terminal is active, and the inactive state, may correspond to an inactive time, which is a time when the terminal was inactive. In addition, on-duration may mean a period of an active state of a terminal corresponding to an active time.

According to an embodiment of the present disclosure, a terminal receiving the GTS may stop (or disable) the drx-On duration timer and terminate the on duration. Alternatively, the GTS may stop (or disable) the drx-inactivity timer and end the on duration. Of course, it is not limited to the above example, and ending the on-duration may include switching to an inactive time or operating in a sleep mode.

According to an embodiment of the present disclosure, the information for terminating the on-duration or the information for instructing to switch to the inactive state of the terminal may correspond to the information for instructing the above-described state change, and an indicator for whether to monitor the PDCCH and May correspond. Of course, it is not limited to the above example. In addition, information on the end period of the on-duration (terminal inactive state maintenance period) may be included in the GTS.

According to an embodiment of the present disclosure, a terminal having finished on-duration may not monitor a predetermined search space, a predetermined control space, or a predetermined PDCCH for a predetermined period.

<Example 3-1-1>

According to an embodiment, the GTS may be used in a new format or an existing format. The DCI format used as the GTS may consist of the following fields. Of course, it is not limited to the above example.

-Carrier indicator

-Bandwidth part indicator

-CSI request indicator

-PDCCH monitoring related setting indicator (PDCCH monitoring period 603 or related setting, blind decoding number or related setting, aggregation level (AL), monitoring occasion, PDCCH monitoring status indicator, etc.)

-In addition, at least one or a combination of one or more of the transmission/reception related parameters in [Table 15]

-Information related to the timing of applying the setting changes indicated by GTS (T _gap )

-Information related to the time period to which the setting changes indicated by GTS are applied (T _duration )

When receiving the GTS, the UE may apply a PDCCH monitoring related setting indicated by the GTS (or other transmission related parameter related setting) to a carrier indicated by a carrier indicator in the DCI format of the GTS.

In addition, when receiving the GTS, the UE may apply the PDCCH monitoring related setting indicated by the GTS (or other transmission related parameter related setting) to the bandwidth part indicated by the bandwidth part indicator in the DCI format of the GTS.

When receiving the GTS, the UE may apply the PDCCH monitoring related setting indicated by the GTS (or other transmission related parameter related setting) from the point indicated by the T _gap in the DCI format of the GTS. For example, if the PDCCH in which the DCI format of the GTS is transmitted is received in slot n, the terminal can apply the configuration change from slot n + T _gap , and perform PDCCH monitoring (or related transmission/reception operation) according to the changed configuration. can do. That is, the GTS may include information on when to apply the PDCCH monitoring-related configuration in the GTS.

When receiving the GTS, the UE may apply the PDCCH monitoring related setting indicated by the GTS (or other transmission related parameter related setting) from the time indicated by the T _duration in the DCI format of the GTS. For example, if the receiving the DCI format of the PDCCH sent by the GTS slots n, n + T terminal slot _gap from slot n + T + T _{gap duration} for the time intervals -1 to be applied to change the setting information I can. In addition, the terminal may perform PDCCH monitoring (or related transmission/reception operation) according to the changed configuration. That is, the GTS may include information on how long to apply the PDCCH monitoring-related setting in the GTS.

<Example 3-1-2>

According to an embodiment, the GTS may be used in an existing format. For example, the GTS may be transmitted using DCI format 0_1 or DCI format 1_1. In addition, as described above, the GTS may be scrambled with a corresponding RNTI (eg, GTS-RNTI, PS-RNTI, or POSS-RNTI). The base station may configure the terminal to monitor DCI format 0_1 or DCI format 1_1 scrambled with an RNTI (eg, GTS-RNTI, PS-RNTI, or POSS-RNTI) corresponding to the GTS.

In the GTS, DCI format 0_1 or DCI format 1_1 scrambled with the corresponding RNTI may include [Field 1] below.

- [Field 1]: PDCCH monitoring related setting indicator (PDCCH monitoring period, blind decoding number, aggregation level (Aggregation Level, AL), monitoring occasion, PDCCH monitoring indicator, etc.) or a transmission/reception related parameter indicator present in [Table 15] At least one or a combination of one or more of them

According to an embodiment, when DCI format 0_1 or DCI format 1_1 is scrambled with WUS-RNTI, existing in DCI format 0_1 or 1_1 scrambled with C-RNTI described in [Table 4] and [Table 6] Some of the fields may be replaced by the aforementioned [Field 1]. Alternatively, some bits of the existing fields in the scrambled DCI format 0_1 or 1_1 may be reinterpreted as the contents of [Field 1] described above.

For example, when the GTS is transmitted using DCI format 0_1 or DCI format 1_1, the bandwidth part indicator field in DCI format 0_1 or DCI format 1_1 may be replaced with [Field 1] described above. In addition, when the GTS is transmitted using DCI format 0_1 or DCI format 1_1, N bits of MSB (Most Significant Bit) or LSB (Least Significant Bit) in the frequency domain allocation information field in DCI format 0_1 or DCI format 1_1, It can be reinterpreted as the instruction in [Field 1] above.

The content indicated by the above-described indicator of [Field 1] may be set by the base station to the terminal using higher layer signaling (eg, MIB, SIB, RRC, MAC CE, etc.). For example, the base station transmits a PDCCH monitoring-related configuration parameter (or a transmission/reception related parameter present in [Table 15]) to 2 ^N to the terminal through higher layer signaling (eg, MIB, SIB, RRC, MAC CE, etc.) -One entry can be set, and the terminal can be notified with N bits of [Field 1] described above.

In addition, according to an embodiment, the base station may set 2 ^N -1 entries composed of a higher set of search spaces including one or a plurality of search space settings to the terminal. In addition, one entry may be selected and indicated from among the search space upper sets set using the N-bit indicator. [Table 17] below describes an example of indicating setting information for a search space using a 2-bit indicator in an embodiment of the present disclosure. Search space #X may mean a search space in which a search space identifier is set to X among search spaces set in [Table 8].

The terminal may perform monitoring on search spaces indicated by [field 1] received from the base station. In an embodiment, when the terminal receives a value indicated as '01' based on [Table 17], the terminal may perform monitoring for search space #1 and search space #2. That is, the terminal may set a search space to be monitored by the terminal through the GTS through [Field 1].

Of course, it is not limited to the above example, and the base station may set a search space to the terminal by using a 1-bit or multi-bit indicator, and a combination of search spaces is also not limited to the example.

In addition, according to an embodiment, the base station may configure a 2 ^N -1 entry composed of a higher set including combinations of transmission/reception related parameters present in [Table 16] to the terminal. In addition, the base station may select and indicate one of the set entries using an N-bit indicator. [Table 18] below is an example of using a 2-bit indicator, and a total of four parameter combinations (PowerSavingMode#1, PowerSavingMode#2, PowerSavingMode#3, PowerSavingMode#4) may be set as higher layer signaling.

In an embodiment, PowerSavingMode#X (X=1, 2, 3, 4) may mean setting information for various transmission/reception related parameters (one or a combination of one or more of the parameters in [Table 16]). That is, PowerSavingMode#X may be set as follows.

PowerSavingMode#X = {PDCCH related setting #X, BWP related setting #X, CA related setting #X, DRX related setting #X, antenna related setting #X, time domain resource allocation related setting #X, HARQ timing related setting #X , CSI-RS setting #X, uplink power control setting #X, other transmission/reception related setting information #X}

The terminal can control or change the related transmission/reception operation by applying the transmission/reception related parameter indicated by [field 1] received from the base station. For example, if the terminal receives a value indicated as '01' based on [Table 18], the terminal may perform transmission/reception based on a transmission/reception parameter corresponding to PowerSavingMode#2. That is, the base station may set parameters for controlling the transmission/reception-related operation of the terminal through the GTS to the terminal through [field 1].

Of course, it is not limited to the above example, and the base station may set a combination of parameters to the terminal by using a 1-bit or multiple-bit indicator, and the transmission/reception related parameters included in PowerSavingMode are also not limited to the above example. It may include some or all, or may further include information not described in the above example.

In addition, in embodiment 3-1-2, it is described that the GTS can be transmitted using DCI format 0_1 or DCI format 1_1, but is not limited to the above example, and GTS is DCI format 0_0, 0_1, 2_0, 2_1, 2_2, It may be transmitted using 2_3, etc., and one field among DCI formats 0_0, 0_1, 2_0, 2_1, 2_2, 2_3 may be replaced with the aforementioned [Field 1] or reinterpreted as the content of [Field 1], The above contents may be included.

<Example 3-2>

According to an embodiment of the present disclosure, the Occasion period and the offset of the GTS may be determined based on setting information on the power saving signal. As described above, the configuration information on the power saving signal may be provided by the base station to the terminal through higher layer signaling (RRC signaling, MIB, SIB).

Referring to FIG. 16, the Occasion 1610 of GTS may mean a specific time interval for receiving the GTS. Since the GTS is a signal monitored at the active time, the Occasion 1610 of the GTS may be located at the active time 1670. The period (or cycle) 1630 of the GTS may include both a period in which the GTS is monitored in the active time 1670 or a period in which the Occasion of the GTS is repeated (or repeatedly transmitted). In addition, the offset (or start offset) 1650 of the GTS means the difference in position or time with respect to how far the GTS is from a reference point or a reference point (e.g., the start of a predetermined slot or active time). can do.

According to an embodiment of the present disclosure, the GTS period 1630 may be set by time, the number of subframes, the number of slots, and the like. In addition, the GTS offset 1650 may also be set by time, the number of subframes, the number of slots, and the like. Furthermore, the GTS offset 1650 may have a negative value.

[Equation 4]

[(SFN Х 10) + subframe number] modulo (GTS-Cycle) = GTS-Offset

Of course, the period 1630 of the GTS is not limited to the above example and may be determined by other equations.

<Example 3-2-1>

According to an embodiment of the present disclosure, since the GTS is monitored at an active time, a period 1630 and an offset 1650 of the GTS may be set in association with the active time. For example, the period 1630 of the GTS may be set in units of slot intervals in the active time of the terminal.

According to an embodiment of the present disclosure, the terminal may determine the active time based on the DRX operation, and monitor the GTS according to a set period 1630. For example, when the onDuration Timer is ON, the terminal may monitor the GTS at each set slot interval. Of course, the terminal may determine the active time based on a timer other than the onDuration Timer (e.g., drx-inactivity timer, drx-Retransmission timer, drxShortCycleTimer), and the terminal is not limited to the above example, and the terminal GTS can be monitored at every set slot interval by determining

Also, according to an embodiment of the present disclosure, the offset 1650 of the GTS may be set to have a relative value from the start of the active time. For example, when the onDuration Timer is turned on, the UE may monitor the GTS at each set slot interval after a set offset slot.

<Example 3-2-2>

According to an embodiment of the present disclosure, the period 1630 and the offset 1650 of the GTS may be set independently from the active time. For example, the period 1630 of the GTS may be set based on a subframe, a system frame, or a slot, and the terminal may monitor the GTS at intervals set based on the subframe number, system frame number, or slot number. .

Further, according to an embodiment of the present disclosure, the offset 1650 of the GTS may be set to have an absolute value based on a subframe, a system frame, and a slot, and the terminal After that, you can monitor the GTS at every set interval.

<Example 3-3>

As described above, the base station can transmit the GTS to the terminal. In addition, the base station may set a control region for transmitting the GTS to the terminal, a search space, and a DCI format to be monitored to the terminal.

<Example 3-3-1>

According to an embodiment of the present disclosure, the control region for transmitting the GTS set by the base station to the terminal may be a control region set by MIB (control region with a control region ID of 0 or control region #0), and the upper layer It may also be a control region set by signaling (eg, MIB, SIB, RRC signaling, etc.).

In addition, the control region for transmitting the GTS set by the base station to the terminal may exist only in a specific bandwidth part. The specific bandwidth part may be an initial bandwidth part set as SIB, a default bandwidth part or a bandwidth part set by a base station among bandwidth parts set as higher layer signaling, and may exist in each bandwidth part. .

<Example 3-3-2>

In addition, according to an embodiment of the present disclosure, the base station may set a search space for transmitting the GTS to the terminal through higher layer signaling. For example, the base station has parameters for the search space described in [Table 8] (ie, the monitoring period and offset per slot, monitoring occasion per symbol, the number of PDCCH candidates for each AL, search space type, DCI format) Etc.) can be set to the terminal.

For example, the base station may set a search space for transmitting GTS as a common search space (CSS), a group common search space (GCSS), or a terminal specific search space. It may be set to (UE-specific Search Space, USS), and may be set to at least one of CSS, GCSS, and USS. The terminal can monitor the GTS in the set search space. This corresponds to the above description.

As described above, when the base station sets the search space for transmitting the GTS to CSS, Y_(p,n ^μ _s,f ) among the parameters for determining the search space may be 0, and if it is set to CSS or GCSS , Y_(p,n ^μ _s,f ) value may be a value corresponding to a group common RNTI (eg GC-RNTI), and when set to USS, Y_(p,n ^μ _s,f ) value is It may be a value that changes according to an identity (C-RNTI or an ID set by the base station to the terminal) and a time index.

<Example 3-4>

According to an embodiment of the present disclosure, the base station may set the DCI format to be monitored in the search space.

According to an embodiment of the present disclosure, the base station may be configured to monitor a specific DCI format (eg, DCI format 0-2 or 1-2 or DCI format 3, etc.) defined to transmit the GTS to the terminal. As described above, the DCI format corresponding to the GTS may be scrambled with an RNTI corresponding to the GTS such as GTS-RNTI, PS-RNTI, or POSS-RNTI. The terminal may receive a DCI format corresponding to the GTS on the assumption that it is scrambled with an RNTI (GTS-RNTI, PS-RNTI or POSS-RNTI) corresponding to the GTS. That is, the format corresponding to the GTS may be descrambled into an RNTI (GTS-RNTI, PS-RNTI, or POSS-RNTI) corresponding to the GTS. That is, the GTS may be transmitted using a dedicated DCI format and a dedicated RNTI.

In addition, the base station may be configured to monitor the DCI format 0-0 or 1-0 scrambled with an RNTI (GTS-RNTI, PS-RNTI or POSS-RNTI) corresponding to the GTS to the terminal. When the terminal has set an RNTI (GTS-RNTI, PS-RNTI or POSS-RNTI) corresponding to the GTS, the RNTI corresponding to the GTS (GTS-RNTI, PS-RNTI or POSS-RNTI) can monitor scrambled DCI.

Of course, the DCI format corresponding to the GTS is not limited to the DCI formats 0-0 and 1-0, and the base station gives the terminal a DCI scrambled with an RNTI (GTS-RNTI, PS-RNTI or POSS-RNTI) corresponding to the GTS. It can also be set to monitor Format 0-1 or 1-1. When the terminal has set the RNTI (GTS-RNTI, PS-RNTI or POSS-RNTI) corresponding to the GTS, it can monitor the DCI scrambled with POSS-RNTI for DCI format 0-1 or 1-1. That is, the GTS may be transmitted using an existing DCI format and a dedicated RNTI.

In other words, the GTS may use an existing or newly defined format, and may be scrambled with a dedicated RNTI.

<Example 3-5>

As described above, the base station can transmit the GTS to the terminal, and the terminal can monitor the PDCCH by applying the PDCCH configuration information indicated by the GTS from a time point after detecting the GTS. In addition, the terminal may receive one or a plurality of search spaces from the base station. In addition, the period or monitoring occasion of each search space may be controlled by the GTS. As described above, the GTS may include configuration information related to PDCCH monitoring, and for example, the following information may be included in a DCI format or field corresponding to the GTS.

-Scaling factor α for PDCCH monitoring period

When the terminal receives the scaling factor α for the monitoring period from the base station through the GTS, the terminal changes or adjusts the monitoring period for the set search spaces or monitors the search spaces in consideration of the received α value. Can be determined. Hereinafter, a method of changing the PDCCH monitoring period based on the above-described scaling factor is proposed.

<Example 3-5-1>

According to an embodiment of the present disclosure, the UE may change the slot unit monitoring period of the search space based on PDCCH monitoring-related configuration information (eg, scaling factor a for the PDCCH monitoring period). That is, the terminal may apply scaling for a preset period based on the received α value.

For example, if the monitoring period of a specific search space is set to T slot and is received as α = A, the terminal may change and apply the monitoring period per slot of the search space to A x T. For example, the monitoring setting may be changed as shown in FIG. 17.

FIG. 17 is a diagram for explaining a method of changing a physical downlink control channel (PDCCH) monitoring setting according to GTS according to an embodiment of the present disclosure. Referring to FIG. 17, the monitoring period per slot of search space #1 (SS#1, 1701) and search space #2 (SS#2, 1702) is set to 1 slot and 2 slots, respectively, and the terminal uses GTS. When receiving and receiving and setting that the scaling factor for the monitoring period is α=2, the terminal sets the monitoring period per slot of search space #1 (1701) to 2 slots, and the monitoring period by slot of search space #2 (1702) is It can be applied by changing to 4 slots. That is, the terminal may change the existing monitoring period setting by multiplying the existing period by a scaling factor. The terminal may monitor the search spaces based on the changed monitoring period.

When α=1, the UE can maintain the previously set slot unit monitoring period without changing the monitoring period of the search space.

When α=0, the terminal may skip without performing monitoring on the set search space.

When 0<α<1, the UE may apply by converting the monitoring period of the search space into a monitoring period in units of symbols. In one embodiment, when the monitoring period per slot of the search space in which the terminal is set is T slot and the terminal receives α = A, the symbol-unit monitoring period T _sym is calculated according to the following <Equation 5> Can be.

[Equation 5]

는 X보다 작으면서 가장 큰 정수를 출력하는 함수이며,

는 X보다 크면서 가장 작은 정수를 출력하는 함수를 의미할 수 있다.In [Equation 5]

Is a function that outputs the largest integer less than X,

May mean a function that outputs the smallest integer greater than X.

Of course, it is not limited to the above example, and when 0<α<1, the UE may determine that the scaling factor (indicator) for the received PDCCH monitoring period is an error. That is, the terminal may expect to be indicated only with a value of α=0 or α>1.

<Example 3-5-2>

According to an embodiment of the present disclosure, the UE may change the monitoring period per symbol unit of the search space based on the PDCCH monitoring-related configuration information (eg, scaling factor a for the PDCCH monitoring period).

The UE may monitor the search space based on monitoring occasion information (monitoringSymbolsWithinSlot) in units of symbols in the slot among the configuration parameters for the search space configured with higher layer signaling (eg, RRC) (see [Table 8]). . For example, bitmap information on a symbol to be monitored among 14 symbols in a slot may be set in the terminal. When a monitoring occasion in units of symbols of a specific search space is set, a monitoring pattern within a set slot may be repeated every set period of a slot unit.

For the search space A in which a symbol-based monitoring occasion and a slot-based monitoring period are set among the search spaces set in the terminal, PDCCH monitoring-related configuration information received by the terminal through the GTS (e.g., PDCCH monitoring The monitoring period can be changed based on the scaling factor a) for the period.

According to an embodiment of the present disclosure, when receiving the GTS, the terminal may not perform monitoring on the search space A. Alternatively, when α>1 or α=0 received by the terminal through POSS, the terminal may not perform monitoring on the search space A.

In addition, according to an embodiment of the present disclosure, the terminal may maintain the monitoring setting for the search space A as it is, regardless of the α value indicated by the GTS. That is, the UE may apply the PDCCH monitoring period change operation based on the value of α indicated by the GTS to only search spaces other than the search space corresponding to search space A.

In addition, according to an embodiment of the present disclosure, when the terminal receives the α value in the GTS, the terminal maintains the symbol unit monitoring occasion pattern in the slot of the search space A and based on the α value received by the slot unit monitoring period. Can be changed. In this case, the above-described embodiment 3-4-1 may be applied to a method of changing the monitoring period in units of slots for the search space A.

Referring to FIG. 17, a symbol unit monitoring occasion is set in search space A 1703 (search space 3 in FIG. 17 has two monitoring occasions set per slot), and a slot unit monitoring period is set to 2 slots. Has been. Based on α = 2 received from the GTS, the UE may change the slot unit monitoring period of the search space A 1703 from the existing 2 slots to 4 slots, and the monitoring occasion pattern in units of symbols in the slot may be maintained as it is.

In addition, according to an embodiment of the present disclosure, the method of changing the monitoring period setting may be applied only when α>1 received by the terminal through the GTS.

<Example 3-5-3>

According to an embodiment of the present disclosure, the UE transmits PDCCH monitoring-related configuration information (e.g., scaling factor a for the PDCCH monitoring period) received through the GTS, regardless of the time when the GTS is received, for higher layer signaling (e.g. MIB, SIB, RRC) can be applied to the parameter value of the search space to change the settings related to PDCCH monitoring.

For example, if the value of a specific parameter of the search space set for higher layer signaling is set to A, and the scaling factor value indicated by GTS is α, the terminal sets the parameter value of the search space to α x A. It can be changed and applied. The PDCCH-related parameter value A that can be adjusted by the scaling factor indicated by the GTS may include, for example, setting values of the following parameters, but is not limited to the following example.

-Slot unit monitoring cycle

-Symbol unit monitoring occasion in slot

-Number of PDCCH candidates per aggregation level (or total number of PDCCH candidates)

-Monitoring length (corresponds to parameter duration in [Table 8])

Similarly, the scaling factor α indicated by the above-described GTS may correspond to a scaling factor that adjusts the following PDCCH related parameters.

-Scaling factor for slot unit monitoring period

-Scaling factor for symbol unit monitoring occasion in slot

-Scaling factor for the number of PDCCH candidates per aggregation level (or the total number of PDCCH candidates)

-Scaling factor for monitoring length (corresponding to parameter duration in [Table 8])

Specifically, if the monitoring period per slot unit of the search space is set to T slot through higher layer signaling, and the terminal receives α = A through the first GTS, the terminal AT It can be changed to and applied. In addition, when the terminal receives α = B through the GTS afterwards, the terminal can apply by changing the slot unit monitoring period of the search space to B x T.

That is, when the terminal changes the setting of the search space based on the above-described embodiments 3-1 and 3-2, the monitoring period or symbol unit of the corresponding search space set to higher layer signaling (RRC) The received α value may be applied based on the monitoring occasion value.

<Example 3-5-4>

According to an embodiment of the present disclosure, the terminal may not always apply a change in configuration content received through the GTS to a value set as higher layer signaling (RRC). The terminal may change the received configuration content using an accumulative method.

According to an embodiment of the present disclosure, the terminal applies the configuration change content (for example, α value) received through the GTS to the PDCCH parameter (or transmission/reception parameter) value that the terminal assumed and operated at a previous time point to change the setting. Can be done.

For example, if the terminal is operating as A for a specific parameter value of the search space at a specific time point, e.g., slot n, and the scaling factor value indicated by GTS is α1, the terminal sets the parameter value of the search space. It can be applied by changing A1 = α x 1A. At a later point in time, if the scaling factor value indicated by the terminal to the GTS is α2, the terminal may change and apply the parameter value of the corresponding search space to A2 = α2 x A1 = α2 xα1 x A. That is, the terminal may change the PDCCH monitoring configuration by sequentially applying the configuration changes received through the GTS in a time order.

Since the PDCCH-related parameter values that can be adjusted by the scaling factor correspond to the above-described embodiment 3-4-3, detailed descriptions are omitted.

Specifically, if the terminal receives the value α = A from slot n to the GTS and the monitoring period of the search space before receiving the GTS is T slot, the terminal receives the GTS and sets the monitoring period of the search space to T' It can be applied by changing it to =A x T. Again, when the terminal receives the value α = B from the GTS in slot m (>n), the terminal can apply by changing the monitoring period of the search space to B x T'= B x A x T.

In the above-described embodiments, the change of configuration information related to PDCCH monitoring has been described based on the change of the period of PDCCH monitoring, but is not limited to the above example. The above-described embodiments can be equally applied even when the GTS indicates a scaling factor β for the number of PDCCH candidate groups per aggregation level (or equally, the number of blind decoding). In addition, the above-described embodiments can be equally applied even when the GTS indicates the scaling factor γ for the number of search space blind decoding.

That is, the terminal may be configured to change the PDCCH monitoring-related configuration information through the GTS from the base station, and the terminal may receive at least one PDCCH monitoring configuration-related parameter (e.g., slot unit monitoring period, intra-slot The monitoring occasion per symbol, the number of PDCCH candidates per aggregation level (or the total number of PDCCH candidates), and the monitoring length) may be changed (a scaling factor is applied to each parameter).

<Example 3-6>

According to an embodiment of the present disclosure, the GTS may always be transmitted according to a predetermined period. That is, the GTS may include information indicating to maintain the existing PDCCH monitoring configuration (e.g., a scaling factor in which parameters related to PDCCH monitoring are not changed), and information indicating to change the PDCCH monitoring configuration (for example, A scaling factor for changing parameters related to PDCCH monitoring) may be included.

In addition, according to an embodiment of the present disclosure, the GTS may be transmitted only when the base station attempts to change the PDCCH monitoring configuration to the terminal. That is, information instructing the GTS to change the PDCCH monitoring setting (e.g., a scaling factor for changing PDCCH monitoring related parameters)

<Example 3-7>

Based on the above-described embodiments, the terminal may be configured to monitor the GTS from the base station, and the terminal may perform monitoring on the GTS according to the configuration. In this case, the UE may or may not receive the GTS on an occasion set to monitor the GTS. That is, the UE monitors the PDCCH according to the period set to monitor the GTS, but may or may not detect the GTS.

If the terminal has successfully received the GTS, the terminal can change or adjust the settings for the PDCCH (or other various parameters related to transmission/reception) according to the contents indicated by the GTS based on the above-described embodiments, and will be changed later. PDCCH can be monitored based on the configuration.

If the terminal has not successfully received the GTS, different understandings of the PDCCH configuration (or other various transmission/reception related parameters) may arise between the base station and the terminal. For example, if the terminal is currently performing a monitoring operation for the PDCCH based on PDCCH configuration #1, and the base station transmits the GTS to change to PDCCH configuration #2 to the terminal, the terminal does not successfully receive the GTS. , The UE may still perform a monitoring operation on the PDCCH based on PDCCH configuration #1. On the other hand, the base station can transmit the PDCCH based on PDCCH configuration #2. In this case, transmission and reception of the PDCCH between the base station and the terminal may not be performed smoothly. Accordingly, when the terminal has not successfully received the GTS, it can operate as follows.

The terminal may be configured with one or a plurality of search space sets from the base station, and one or part of the set search space sets may be defined as a "first search space". The "first search space" may be defined as a search space whose settings are not changed by the GTS. Of course, it is not limited to the above example, and the first search space may be referred to as a default search space or a default search space.

For example, if two sets of search spaces, search space #1 and search space #2, are set in the terminal, and search space #1 of which is "first search space", the terminal receives the GTS, the corresponding Changes in the setting of the PDCCH indicated by the GTS may not be applied to search space #1 corresponding to "first search space", and may be applied only to search space #2, not "first search space".

That is, only the setting of search space #2 can be changed based on the GTS. Therefore, even if the terminal does not successfully receive the GTS, the same understanding between the base station and the terminal can still be maintained for the search space sets corresponding to the "first search space", and accordingly, the "first search space" The PDCCH may be received from the base station by using a search space set corresponding to ".

The aforementioned "first search space" may correspond to a set of search spaces having characteristics of at least one or a combination of one or more of the following characteristics, for example.

-Search space set with search space type set to common search space

-The set of search spaces set to the lowest (or highest) index

-Search space set with index set to 0

-A set of search spaces associated with the control region set to the lowest (or highest) index (that is, set to be monitored in that control region)

-A set of search spaces monitored in the control area where the index is set to 0

-A set of search spaces associated with the portion of the bandwidth set to the lowest (or highest) endex (that is, set to be monitored in that portion of the bandwidth)

-A set of search spaces monitored in the bandwidth part set as the default bandwidth part (for example, the bandwidth part set as defaultDownlinkBWP or defaultDownlinkBWP-Id) with higher layer signaling (for example, RRC) (defaultDownlinkBWP is defined as If it is not received during a specific time period, it may correspond to the bandwidth for fallback that performs the change.)

-A set of search spaces monitored in the bandwidth portion set to firstActiveDownlinkBWP with higher layer signaling (e.g. RRC) (firstActiveDownlinkBWP may correspond to the bandwidth portion initially activated by the base station by higher layer signaling)

-A set of search spaces set up to monitor POSS

-A set of search spaces set or designated by the base station as "first search space"

In addition, according to an embodiment of the present disclosure, when the terminal does not successfully receive the GTS, the terminal may maintain the existing PDCCH configuration as it is. If the base station determines that the terminal has not received the GTS, the base station may transmit control information and data or retransmit the GTS according to the existing PDCCH configuration of the terminal.

<Example 3-8>

Based on the above-described embodiments, the terminal may be configured to monitor the GTS from the base station, and the terminal may perform monitoring on the GTS according to the configuration. In particular, as described above, the GTS may include information (T _gap ) related to the time point of applying the configuration change indicated by the GTS and information (T _duration ) related to the time period to which the configuration change indicated by the GTS is applied.

The terminal monitors the search space set and other search space sets set to monitor the GTS based on information related to the time of application (T _gap ) and information related to the time interval to which the setting change is applied (T _duration ). A method of performing the may be as follows.

<Example 3-8-1>

According to an embodiment of the present disclosure, the terminal includes a set of search spaces configured to monitor the GTS based on information related to the time of application (T _gap ) and information related to a time interval to which the setting change is applied (T _duration ) Other sets of search spaces can be monitored.

According to an embodiment of the present disclosure, the terminal may perform monitoring only on a set of search spaces set to monitor the GTS at a specific point in time, and when the GTS is successfully received, a specific time (T _gap After ≥ 0), during a specific time period (T _duration ), a configuration change for the PDCCH may be applied based on the content indicated by the detected GTS to perform monitoring of other search space sets.

According to an embodiment of the present disclosure, the terminal may monitor not only the set of search spaces set to monitor the GTS at a specific point in time, but also other sets of search spaces, and when successfully receiving the GTS, the terminal detects the GTS. From after a specific time (T _gap ) at the time point, during a specific time period (T _duration ), it is possible to monitor other search space sets by applying a configuration change for the PDCCH based on the content indicated by the detected GTS. .

<Example 3-8-2>

According to an embodiment of the present disclosure, the terminal may or may not monitor the GTS during information (T _duration ) related to the time period to which the configuration change is applied, and may always perform monitoring.

According to an embodiment of the present disclosure, the terminal may not perform monitoring on the search space set for the GTS during the T _duration .

According to an embodiment of the present disclosure, the terminal may continuously perform GTS monitoring for T _duration . The UE may perform monitoring for the GTS during the T _duration , and if the GTS is detected, the UE may control a monitoring operation for the PDCCH based on configuration information included in the newly detected GTS. In more detail, the UE may detect the first GTS, and monitor the PDCCH and the GTS during the T _duration period after the T _gap time. When the terminal detects the second GTS during the T _duration time period, the terminal detects the second setting information-1 (eg, various configuration information that can be indicated by the above-described POSS) indicated by the first detected POSS It can be newly applied by changing to the designated POSS indicated setting information-2. There is an advantage in that the monitoring operation for the PDCCH of the terminal can be more dynamically controlled through the above-described method.

According to an embodiment of the present disclosure, the base station sets whether or not to perform monitoring for the GTS within the T _duration through higher layer signaling (eg, MAC CE signaling) or L1 signaling (DCI, POSS) to the terminal. Or you can direct. The UE may set or receive an indication of whether to perform or not to monitor the GTS within the T _duration through higher layer signaling (eg, MAC CE signaling) or L1 signaling (DCI, WUS) from the base station. You can decide whether to monitor the GTS according to the notification.

According to an embodiment of the present disclosure, the terminal may implicitly determine whether to perform or not monitor the GTS within the T _duration based on configuration information for the GTS (POSS monitoring period, T _duration, etc.). . For example, when the POSS monitoring period is greater than a predetermined or set specific threshold, the terminal may not perform monitoring on the GTS within the T _duration . As another example, when the monitoring period for the GTS is less than a predetermined or set specific threshold, the terminal may not perform monitoring for the GTS within the T _duration . As another example, when the T _duration time is less than a predetermined predetermined threshold value, the terminal may not perform monitoring on the GTS within the T _duration . As another example, when the T _duration time is greater than a predetermined predetermined threshold value, the terminal may not perform monitoring on the GTS within the T _duration .

According to an embodiment of the present disclosure, the monitoring occasion of the GTS may be aligned with a time consisting of a T _gap and a T _duration . For example, the GTS monitoring period and the T _duration may be the same. That is, the UE may not expect that there is an additional monitoring occasion for the GTS in a time period (eg, T _duration ) in which the configuration change indicated by the GTS is applied. That is, if the terminal detects the GTS in a specific monitoring occaison, the terminal performs monitoring on other search space sets by applying the configuration changes for the PDCCH indicated by the POSS during the time interval corresponding to the next monitoring occasion for the GTS. can do.

In addition, according to an embodiment of the present disclosure, the terminal may always monitor search space sets set as a common search space regardless of whether or not to monitor the GTS.

According to an embodiment of the present disclosure, the terminal may perform monitoring by maintaining the settings set by conventional higher layer signaling for search space sets set as common search spaces regardless of the indicated contents of the received GTS. have.

<Example 3-9>

According to an embodiment of the present disclosure, the GTS may be transmitted for each cell, for each cell group, or for each bandwidth part. Hereinafter, a unit group in which the GTS is transmitted will be described.

<Example 3-9-1>

According to an embodiment of the present disclosure, the GTS may be transmitted for each cell group including a plurality of cells. That is, one GTS corresponding to a plurality of cells may be transmitted, and a terminal may receive a GTS corresponding to a plurality of cells by monitoring one control region or a search region.

Referring to FIG. 18, one GTS 1810 may be transmitted in a Primary cell (PCell) or a Primary SCell (PSCell) (Serving Cell #0) 1800. One GTS 1810 may control PDCCH monitoring settings in Serving Cell #0 (1800), Serving Cell #1 (1801), and Serving Cell #2 (1802).

According to an embodiment of the present disclosure, a cross-carrier indicator may be included in one GTS 1810, and a cell to control PDCCH monitoring configuration may be indicated through a cross-carrier indicator in the GTS 1810. Alternatively, the cell to control the PDCCH monitoring configuration may be indicated through a cross-carrier indication field (CIF). In addition, the PDCCH monitoring configuration in one GTS 1810 may be commonly applied to all cells.

Also, according to an embodiment of the present disclosure, all PDCCH monitoring configuration information for a plurality of cells may be included in one GTS 1810. For example, PDCCH monitoring configuration information for a CA configured cell or a CA activated cell may be all included in the order of a cell index. In addition, a scaling factor for a PDCCH monitoring period may be included in the order of one GTS 1810 cell index. According to an embodiment of the present disclosure, when PDCCH monitoring configuration information for a plurality of cells is included in one GTS 1810, a cell to which PDCCH monitoring configuration information is mapped may be identified according to a bit position in the GTS 1810. have.

Also, a bandwidth part in which one GTS for a plurality of cells is transmitted may be set by the base station. The base station may configure a bandwidth part for receiving one GTS for a plurality of cells by using an identifier for the bandwidth part.

<Example 3-9-2>

According to an embodiment of the present disclosure, the GTS may be transmitted in each cell. That is, a GTS corresponding to each cell may be transmitted, and the terminal may receive a GTS corresponding to each cell by monitoring a control region or a search region corresponding to each cell.

Referring to FIG. 19, a first GTS 1910 may be a GTS transmitted from a PCell (Primary cell) or a PSCell (Primary SCell) (Serving Cell #0) 1900, and the first GTS 1910 is a PCell ( Primary cell) or PSCell (Primary SCell) PDCCH monitoring configuration can be controlled. In addition, the second GTS 1920 may be a GTS transmitted from the Serving Cell #2 1902, and the second GTS 1920 may control a PDCCH monitoring setting in the Serving Cell #2 1902.

If cross-carrier scheduling is configured, the base station may control the PDCCH monitoring configuration of another cell using the cross-carrier indicator. Referring to FIG. 18, when cross-carrier scheduling is configured, the UE controls the PDCCH monitoring configuration in Serving Cell #1 (1901) based on a carrier indicator or a cross-carrier indication field (CIF) and a first GTS 1910. May be.

In addition, when the GTS is transmitted in each cell, the offset of the GTS in each cell may be different. That is, the base station may separately set the GTS offset for each cell or may set an additional offset for each cell. In addition, the period of the GTS in each cell may also be different.

In addition, the bandwidth parts through which the GTS is transmitted in each cell may be the same or different. According to an embodiment of the present disclosure, the base station may be configured by using an identifier for a bandwidth part in which the GTS for each cell is transmitted.

<Example 3-9-3>

In addition, according to an embodiment of the present disclosure, when a plurality of bandwidth parts are configured, the GTS may be transmitted in units of activated bandwidth parts. That is, a GTS corresponding to each bandwidth part may be transmitted, and the terminal may receive a GTS corresponding to each bandwidth part by monitoring a control area or a search area corresponding to each bandwidth part.

According to an embodiment of the present disclosure, when a plurality of bandwidth parts are configured, the GTS may be transmitted through a specific bandwidth part for transmission of the GTS. The bandwidth part for GTS transmission may be distinguished from other bandwidth parts, and the GTS It may have a suitable configuration for transmission of a PDCCH corresponding to the GTS, such as setting a control region for transmission and a search space for transmission of the GTS.

According to an embodiment of the present disclosure, the bandwidth part switching indicator (BWP switching indicator) or the bandwidth part switching information (BWP switching information) may operate as a trigger of a GTS monitoring operation. For example, when the terminal monitors the bandwidth part in which the GTS is not transmitted and then switches the bandwidth part to the bandwidth part in which the GTS is transmitted based on the bandwidth part switching indicator or the bandwidth part switching information, the GTS monitoring operation may be started.

In addition, according to an embodiment of the present disclosure, when the terminal is operating in a bandwidth part in which the GTS is not transmitted, the base station may transmit an explicit indication to the terminal to monitor the GTS.

According to an embodiment of the present disclosure, PDCCH monitoring configuration information for a plurality of bandwidth parts may be included in one GTS. When PDCCH monitoring configuration information for a plurality of bandwidth parts is included in one GTS, a cell to which the PDCCH monitoring configuration information is mapped may be identified according to a bit position in the GTS.

<Example 3-9-4>

According to an embodiment of the present disclosure, the GTS may include PDCCH monitoring configuration information for a plurality of UEs. That is, the GTS may be transmitted in units of a plurality of UEs. As described above, the base station may transmit the GTS through CSS, and PDCCH monitoring configuration information for a plurality of UEs may be included in one GTS. For example, one GTS 1810 may include a scaling factor for a PDCCH monitoring period for each UE.

According to an embodiment of the present disclosure, when the PDCCH monitoring configuration information for a plurality of UEs is included in one GTS 1810, the terminal determines the terminal to which the PDCCH monitoring configuration information is mapped according to the bit position in the GTS 1810. You can also identify.

The detailed embodiments described above may be operated in combination with each other. For example, the period and offset of the GTS may be set in association with the active time or may be set independently, and the control region through which the GTS is transmitted may be set as MIB or higher layer signaling, The search space in which the GTS is transmitted may be one or two, and the method of controlling the monitoring period for the PDCCH of the UE through the GTS may be based on a value set through higher layer signaling or may be determined cumulatively. , It is not limited to the above example, and a combination of respective embodiments is possible.

In addition, the GTS setting may correspond to at least some WUS settings. For example, settings related to the DCI format, RNTI, period, and offset of the GTS may correspond to settings related to the DCI format, RNTI, period, and offset of the WUS. In addition, as described above, all of the embodiments related to WUS may be applicable to uni-POSS.

<Fourth Example>

As described above, the WUS may be a power saving signal monitored by the terminal at the inActive time. WUS may be a predetermined DCI provided through the PDCCH. Hereinafter, the WUS will be described in more detail.

20 is a diagram for describing a wake up signal (WUS) according to an embodiment of the present disclosure.

As described above, the wake up signal (WUS) is a signal transmitted for the purpose of reducing power consumption of the terminal. In an embodiment of the present disclosure, the WUS may indicate whether to wake up so that the UE monitors the PDCCH. More specifically, the WUS may indicate whether the UE wakes up on a DRX occasion and monitors the PDCCH. In addition, the WUS may be transmitted on the PDCCH, and the UE may monitor the PDCCH to detect downlink control information (DCI) corresponding to the WUS. In the present disclosure, the terminal may WUS the DCI corresponding to the power saving signal detected through PDCCH monitoring. In this case, the DCI may be scrambling with a specific Radio Network Temporary Identifier (RNTI). The specific RNTI may be a newly defined RNTI or an existing RNTI may be used. The terminal may receive the WUS assuming that it is scrambled with a specific RNTI. In this case, the terminal may de-scrambling the WUS using a specific RNTI. In one embodiment, the DCI may be a UE-specific DCI (UE-specific DCI) or a group-common DCI (Group-common DCI). Hereinafter, for convenience of description, an operation of receiving a DCI corresponding to WUS through PDCCH monitoring is referred to as a WUS monitoring operation. In addition, receiving WUS may have the same meaning as receiving DCI corresponding to WUS.

Referring to FIG. 20, when the WUS monitoring operation is set, the UE wakes up on every DRX occasion and can receive WUS through the PDCCH in a specific time period before the active time (4605) in a time period set to monitor the PDCCH. have. In this way, a specific time interval in which WUS can be received is referred to as a WUS occasion 4810. In one embodiment, the WUS occasion (4810) is a DRX occasion, a DRX on duration, an on duration timer activation (drx-onDurationTimer), which is a time interval in which the UE can receive the PDCCH during DRX operation or monitors the PDCCH. Or, it may be located at least before a set offset from the start time of the active time 4605. Here, the offset may be set by time, the number of slots, the number of subframes, and the like.

In FIG. 20, the WUS occasion 4810 is shown to be located at an InActive time 4610, which is a time set so that the UE does not need to monitor the PDCCH during DRX operation, that is, a time set not to receive the PDCCH, but is limited thereto. Otherwise, the WUS occasion 4810 may be located at the active time 4605. This will be described in detail again below.

When the UE detects the WUS by monitoring the PDCCH at the WUS occasion 4810, the UE may or may not monitor the PDCCH in the time period set as the active time 4605 as indicated by the WUS. More specifically, the UE may wake up from the DRX occasion according to the instructions of the WUS and monitor the PDCCH at the set active time (4605), and even if the DRX occasion arrives, it does not wake up and skips the set active time (4605). It is possible to keep the sleep or InActive state at the InActive time (4610).

In one embodiment, the WUS instructs the terminal to wake up on a DRX occasion related to WUS, or does not skip a DRX occasion related to WUS (do not skip), or on a DRX occasion related to WUS The PDCCH can be monitored or instructed to start drx-onDurationTimer on a DRX occasion related to WUS. In addition, the WUS does not indicate that the terminal will wake up on a DRX occasion related to WUS, or does not indicate that the terminal will not wake on a DRX occasion related to WUS (do not wake-up), or In the DRX occasion, the PDCCH is not monitored, the drx-onDurationTimer is not started in the WUS-related DRX occasion, or the related DRX occasion may be instructed to skip.

In one embodiment, the WUS occasion 4810 is shorter in length compared to the active time 4605. Therefore, the time when the receiver is turned on to receive to monitor the PDCCH at the WUS occasion (4810) is less than the time when the receiver is turned on to receive to monitor the PDCCH at the active time (4605). short. Therefore, the UE monitors the PDCCH only when there is a PDCCH to be received based on the WUS, thereby reducing power consumption of the UE.

21 is a diagram for explaining a method of checking a WUS occasion area according to an embodiment of the present disclosure.

Referring to FIG. 21, a base station may indicate a WUS occasion area to a terminal. More specifically, the base station may provide WUS configuration information to the terminal through higher layer signaling (RRC signaling, MIB, SIB). In an embodiment, the WUS setting information may include a WUS offset or a WUS start offset (WUS-Offset or WUS-StartOffset, 4910) and a WUS cycle (WUS cycle, 4920). The base station can configure the WUS monitoring operation by transmitting WUS configuration information to the terminal. The UE may detect a DCI corresponding to WUS by monitoring the PDCCH based on the WUS configuration information provided by the base station.

<Example 4-1-1>

Hereinafter, in the embodiment 4-1-1, a method for the base station to independently configure the WUS monitoring operation to the terminal regardless of the DRX operation will be described.

In an embodiment of the present disclosure, the base station may set the WUS offset 4910 and the WUS period 4920 to the terminal regardless of the DRX occasion in which the terminal can receive the PDCCH or the time interval during which the terminal monitors the PDCCH. have. However, this means that WUS can be configured irrespective of the DRX operation, and WUS configuration information can be expressed using a parameter of the DRX configuration information. In one embodiment, the WUS may operate independently without considering the DRX operation or without considering the DRX operation, but in any case, the base station may independently set the WUS occasion to the UE regardless of the DRX operation.

In an embodiment of the present disclosure, the base station may set a WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) and a WUS cycle (WUS cycle, 4920) to a terminal to arbitrary values. In this case, the WUS cycle (4920) may be set by time, the number of subframes, the number of slots, and the like. In addition, WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may also be set by time, number of subframes, number of slots, and the like. Furthermore, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may have a negative value. Additionally, the WUS offset may be an absolute value, that is, based on subframe 0, or may be a relative value with drx-startoffset.

In an embodiment of the present disclosure, the base station sets a WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) and a WUS cycle (WUS cycle, 4920) to the terminal, and the following [Equation 6], [ A subframe or slot satisfying Equation 6A] or [Equation 6B] may be set as the location of the WUS occasion. Furthermore, the base station sets the WUS-SlotOffset to the terminal, and the WUS occasion can be located in a slot after the WUS-SlotOffset in a subframe satisfying [Equation 6], [Equation 6A] or [Equation 6B] below. have. Here, WUS-SlotOffset means a delay before starting the WUS-onDurationTimer. drx-SlotOffset may be set by, for example, time, number of slots, and the like.

[Equation 6]

[(SFN Х 10) + subframe number] modulo (WUS-Cycle) = WUS-Offset(WUS-StartOffset)

[Equation 6A]

[(SFN Х 10) + subframe number] modulo (WUS-Cycle) = (drx-StartOffset-WUS-Offset) modulo (WUS-Cycle)

[Equation 6B]

[(SFN Х 10) + subframe number] modulo (WUS-Cycle) = (drx-StartOffset-WUS-Offset) modulo (drx-ShortCycle)

In this case, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) and the WUS cycle (WUS cycle, 4920) may be set as WUS-CycleStartOffset (or WUS-CycleOffset). In addition, WUS-CycleStartOffset (or WUS-CycleOffset) may be set by, for example, time, number of subframes, number of slots, and the like.

In an embodiment of the present disclosure, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) is a DRX occasion, which is a time period during which the UE can receive the PDCCH or the UE monitors the PDCCH, DRX on duration. It may be set based on (on duration), on-duration timer activation (drx-onDurationTimer), or active time (4605). For example, a WUS offset or a WUS start offset (WUS) from the start point (eg, start symbol) of the DRX occasion, DRX on duration, on duration timer activation (drx-onDurationTimer), or active time 605 -Offset or WUS-StartOffset, 4910) can be set to start the WUS occasion at the previous time. At this time, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may also be set by time, the number of subframes, the number of slots, and the like, and may have a negative value.

In an embodiment of the present disclosure, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may be set based on the DRX cycle. At this time, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may satisfy the following [Equation 7].

[Equation 7]

WUS-Offset< DRX cycle(or drx-LongCycle)

As described above, the WUS occasion 4810 is a DRX occasion that is a time interval in which the UE can receive the PDCCH or the UE monitors the PDCCH, DRX on duration, and on duration timer activation (drx-onDurationTimer Activation). , Or at least before the set offset from the start time of the active time 4605. Therefore, when WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) is set based on the DRX cycle, WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) The absolute value of the WUS start offset (WUS-Offset or WUS-StartOffset, 4910) must be smaller than the DRX cyle (or DRX-LongCycle).

In addition, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 910) may satisfy the following [Equation 8].

[Equation 8]

WUS-Offset(or WUS-StartOffset) = c * DRX cycle(or drx-LongCycle)

(-1 <c <1, c is a rational number)

Here, c may be a newly set parameter or may be generated by combining existing parameters.

Even in this case, the WUS occasion (4810) is a DRX occasion, which is a time interval in which the UE can receive the PDCCH or the UE monitors the PDCCH, DRX on duration, on duration timer activation (drx-onDurationTimerActivation), or It may be located at least before the set offset from the start time of the active time 4605. Therefore, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) should be smaller than the positive DRX cycle (or drx-LongCycle) and larger than the negative DRX cycle (or drx-LongCycle). At this time, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 910) may also be set by time, the number of subframes, the number of slots, etc., and may have a negative value.

In one embodiment, the WUS cycle (WUS cycle, 4920) may be set to N times (N is a natural number) of the DRX cycle. More specifically, the WUS cycle (WUS cycle, 4920) may be set to N times (N is a natural number) of the Long DRX cycle.

<Example 4-1-2>

In the following embodiment 4-1-2, in consideration of DRX configuration information, a method for the base station to indicate a WUS occasion to the terminal will be described. More specifically, in consideration of the DRX occasion in which the UE can receive the PDCCH or the time period during which the UE monitors the PDCCH, the base station may set the WUS offset 4910 and the WUS cycle 4920 to the UE. In addition, WUS configuration information may be expressed using a parameter of DRX configuration information. In an embodiment, the WUS may operate in consideration of the DRX operation. In this case, the WUS cycle (4920) may be set by time, the number of subframes, the number of slots, and the like. In addition, WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may also be set by time, number of subframes, number of slots, and the like.

In one embodiment, the WUS cycle (WUS cycle, 4920) may vary according to the length of the DRX cycle (or DRX-LongCycle). More specifically, the length of the DRX cycle (or DRX-LongCycle) may be compared with a preset value or a value set by the base station, and a WUS cycle (WUS cycle, 4920) may be differently set according to the result. For example, if the preset value or the value set by the base station is X, if the DRX cycle (or DRX-LongCycle) <X, then the WUS cycle (WUS cycle, 4920) = N * DRX cycle (or DRX-LongCycle) (N is a natural number). In this case, one WUS and a plurality of DRX occasions may be mapped 1-to-N according to the value of N (one-to-N mapping). In addition, when the preset value or the value set by the base station is X, when the DRX cycle (or DRX-LongCycle) ≥ X, the WUS cycle (WUS cycle, 920) = DRX cycle (or DRX-LongCycle) may be . In this case, one WUS and one DRX occasion may be mapped on a one-to-one basis (one-to-one mapping). Alternatively, when the DRX cycle (or DRX-LongCycle) ≥ X, WUS cycle = K * DRX cycle (or DRX-LongCycle) (K is a natural number). In this case, N and K may be different values and may be respectively indicated by the base station. In this case, the WUS cycle (WUS cycle, 4920) and/or the DRX cycle (or DRX-LongCycle) may be set by time, the number of subframes, the number of slots, and the like.

In addition, in an embodiment, a WUS cycle (WUS cycle, 4920) may be preset or defined according to the length of the DRX cycle (or DRX-LongCycle). In this case, the length of at least one DRX cycle (or DRX-LongCycle) and at least one WUS cycle (WUS cycle, 4920) may be mapped and stored in a table format. At this time, the length of the DRX cycle (or DRX-LongCycle) and the WUS cycle (WUS cycle, 4920) do not necessarily need to be corresponded one-to-one, and one or more WUS cycles per the length of one DRX cycle (or DRX-LongCycle). (WUS cycle, 4920) may be mapped, and conversely, one WUS cycle (WUS cycle, 4920) may be mapped to the length of one or more DRX cycles (or DRX-LongCycle). In one embodiment, when the DRX cycle (or DRX-LongCycle) is determined, the WUS cycle (WUS cycle, 4920) is also determined by the table. In this case, the WUS cycle (WUS cycle, 4920) and/or the DRX cycle (or DRX-LongCycle) may be set by time, the number of subframes, the number of slots, and the like.

In one embodiment, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) is a DRX occasion, which is a time interval during which the UE can receive the PDCCH or the UE monitors the PDCCH, and the DRX on duration ), on-duration timer activation (drx-onDurationTimerActivation), or active time 4605. For example, a WUS offset or WUS start offset from the start point (eg, start symbol) of DRX occasion, DRX on duration, on duration timer activation (drx-onDurationTimerActivation), or active time 605 (WUS -Offset or WUS-StartOffset, 4910) can be set to start the WUS occasion at the previous time. At this time, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may also be set by time, the number of subframes, the number of slots, and the like, and may have a negative value.

In one embodiment, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may be set based on the DRX cycle. In this case, the offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may satisfy the following [Equation 9].

[Equation 9]

WUS-Offset< DRX cycle(or drx-LongCycle)

As described above, the WUS occasion 4810 is a DRX occasion, which is a time interval in which the UE can receive the PDCCH or the UE monitors the PDCCH, DRX on duration, on duration timer activation (drx-onDurationTimerActivation), Alternatively, it may be located at least before a set offset from the start time of the active time 4605. Therefore, when WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) is set based on the DRX cycle, WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) The absolute value of the WUS start offset (WUS-Offset or WUS-StartOffset, 4910) must be smaller than the DRX cyle (or DRX-LongCycle).

In addition, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 910) may satisfy the following [Equation 10].

[Equation 10]

WUS-Offset(or WUS-StartOffset) = c * DRX cycle(or drx-LongCycle)

(-1 <c <1, c is a rational number)

Here, c may be a newly set parameter or may be generated by combining existing parameters.

Even in this case, the WUS occasion (4810) is a DRX occasion, which is a time interval in which the UE can receive the PDCCH or the UE monitors the PDCCH, DRX on duration, on duration timer activation (drx-onDurationTimerActivation), or It may be located at least before the set offset from the start time of the active time 4605. Therefore, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) should be smaller than the positive DRX cycle (or drx-LongCycle) and larger than the negative DRX cycle (or drx-LongCycle). At this time, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may also be set by time, the number of subframes, the number of slots, and the like, and may have a negative value.

In one embodiment, the WUS may include a bandwidth part switching indicator (BWP switching indicator) or bandwidth part switching information (BWP switching information) indicating switching to a specific bandwidth. At this time, physical time is required to switch the bandwidth part. The time taken to switch the bandwidth part may be _referred to as a bandwidth switching delay ( _{BWP_delay} ). The WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may be set to be larger than the bandwidth switching delay value in consideration of such a bandwidth switching delay. More specifically, the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) may be set to be greater than the maximum bandwidth switching delay value.

As described above, in the next-generation mobile communication system (5G or NR system), the base station may set one or a plurality of bandwidth parts (BandWidth Part, BWP) to the terminal. At least one bandwidth part among the set one or a plurality of bandwidth parts may be activated. For example, the base station may transmit a WUS indicating whether to wake up to monitor the PDCCH in the CORESET of the inactive bandwidth part through the activated bandwidth part. In this case, hardware and/or software processing may be required to activate an unactivated bandwidth part, and a delay may occur in this processing. Accordingly, in an embodiment, the base station may set the WUS offset or WUS start offset (WUS-Offset or WUS-StartOffset, 4910) to be greater than the bandwidth switching delay value in consideration of the bandwidth switching delay.

22 is a diagram for explaining a method of monitoring a physical downlink control channel (PDCCH) for receiving a WUS when a WUS occasion is located at an active time according to an embodiment of the present disclosure.

Referring to FIG. 22, when the UE operates in a Long DRX cycle and receives (4630) a predetermined event at an active time 605, for example, a PDCCH indicating a new uplink transmission or a downlink transmission. If it occurs, start or restart drx-InactivityTimer. Although not shown in FIG. 10, in this case, the terminal may operate in a short DRX cycle. When the UE receives (4630) a PDCCH indicating new uplink transmission or downlink transmission, it extends the active time (4605) in anticipation of additional uplink transmission or downlink transmission in the future and/or the arrival of the InActive time. Is to delay.

At this time, when a PDCCH indicating new uplink transmission or downlink transmission is continuously received and the drx-InactivityTimer is continuously restarted, the active time (4605) is repeatedly extended or and/or the arrival of the InActive time is delayed. There may be a case where the WUS occasion 4010 is located within the active time 4605 for various reasons. According to an embodiment, in order to reduce power consumption of the terminal, the terminal receives WUS by waking up from a sleep or InActive state during a DRX operation in order to check whether there is a PDCCH to be received. However, when the WUS occasion is located within the active time (4605), since the terminal is already awake and in an active state, the base station needs to determine whether to transmit the WUS. In addition, the terminal needs to determine whether to monitor the PDCCH in order to detect downlink control information (DCI) corresponding to the WUS.

<Example 4-2-1>

In the following 4-2-1 embodiment, when the WUS occasion is located within the active time 4605, a method of not monitoring the WUS will be described.

In one embodiment, when the WUS occasion 4010 is located within the active time 4605 for various reasons such as the active time 4605 is repeatedly extended or and/or the arrival of the InActive time is delayed, the base station uses the WUS. May not be transmitted. In addition, the terminal may not monitor the PDCCH in order to detect the DCI corresponding to the WUS. WUS is a signal for waking the terminal in the sleep or InActive state, but in this case, since the terminal is already awake, there is no need to monitor the PDCCH to detect the DCI corresponding to the WUS.

In one embodiment, a DRX occasion related to a WUS occasion that does not monitor the PDCCH may perform a specific operation. Here, the specific operation may include an operation that is assumed to always wake up on the DRX occasion, or may include a default operation. The default operation may be predefined or may be preset by the base station. The default behavior may include always waking up. For example, in FIG. 22, in the DRX occasion (4605-101) related to the WUS occasion (4010) located within the active time (4605), the terminal may perform an operation assuming awakening, and a default operation, for example Listen, you can also perform a wake-up action. Further, in FIG. 10, the WUS occasion 4010 is shown to be related to one DRX occasion (4605-101), but is not limited thereto, and may be related to a plurality of DRX occasions (4605-101, 4605-102). have. In this case, in all of the DRX occasions (4605-101, 4605-102), the UE may perform an operation assuming awakening, or may perform a default operation, for example, a wake-up operation.

<Example 4-2-2>

Hereinafter, in Embodiment 2-2, when the WUS occasion is located within the active time 4605, a method of monitoring WUS will be described.

In one embodiment, even when the WUS occasion 4010 is located within the active time 4605 for various reasons, such as the active time 4605 is repeatedly extended or and/or the arrival of the InActive time is delayed, the base station is Can be transmitted. In addition, the terminal may monitor the PDCCH to detect the DCI corresponding to the WUS.

In one embodiment, when the WUS occasion 4010 is located within the active time 4605, as a result of detecting the DCI corresponding to the WUS by monitoring the PDCCH, the terminal will wake-up in the DRX occasion related to the WUS Does not indicate, or does not indicate that the terminal does not wake on a DRX occasion related to WUS (do not wake-up), does not monitor the PDCCH on a DRX occasion related to WUS, or indicates not to start the drx-onDurationTimer (615), or In the case of instructing to skip the related DRX occasion, the terminal may stop the active time 4605. More specifically, the terminal may stop drx-onDurationTimer and/or stop drx-InactivityTimer. In addition, the terminal may enter a sleep or InActive state.

In addition, in an embodiment, when the WUS occasion 4010 is located within the active time 4605, the size of the DCI corresponding to the WUS is the same size as the existing DCI formats (eg, DCI format 0_0/1_0) Can be arranged to have This will be described with reference to FIG. 23.

23 is a diagram for explaining a DCI format and size corresponding to WUS according to an embodiment of the present disclosure.

According to an embodiment of the present disclosure, a DCI corresponding to WUS may have a size different from that of existing DCI formats (eg, DCI format 0_0/1_0). The next-generation mobile communication system (5G or NR system) may limit the number of DCIs having different sizes monitored by the terminal to a specific number or less in order to reduce the complexity of the DCI decoding of the terminal. For example, a next-generation mobile communication system (5G or NR system) can always satisfy both of the following two conditions.

[Condition 1]

-The terminal can monitor a maximum of X DCIs having different sizes per slot (eg, X=4).

[Condition 2]

-The UE can monitor a maximum of Y DCIs having different sizes per slot for a specific RNTI. For example, a specific RNTI may mean C-RNTI, CS-RNTI, MCS-C-RNTI, or other terminal-specific RNTI (eg, Y=3).

The base station may appropriately adjust the DCI size to satisfy [Condition 1] and [Condition 2] described above. The UE may not expect to set a DCI size that does not satisfy [Condition 1] and [Condition 2] described above. The size of the frequency axis resource allocation field of the DCI format 0_0/1_0 monitored in the UE-specific search space may be determined as the size of the currently active bandwidth part. However, if the size of the DCI format 0_0/1_0 monitored in the terminal-specific search space is determined as the size of the currently active bandwidth part, and the condition of the above-described DCI size limitation is not satisfied, the DCI format 0_0/1_0 The size of the frequency axis resource allocation field may be determined by the size of the initial bandwidth part. That is, the size of the DCI format 0_0/1_0 monitored in the common search space and the size of the DCI format 0_0/1_0 monitored in the UE-specific search space become the same, so that the number of DCIs having different sizes can be reduced.

In general, since the WUS is transmitted at the InActive time, there are no other DCIs 4110 transmitted together. Accordingly, the DCI corresponding to the WUS 810 transmitted at the InActive time 610 may be set to have the same size as other DCI 4110 formats, and other DCI 4110 may not be considered. However, as shown in FIG. 22, when the WUS occasion 4010 is located within the active time 4605, the WUS is transmitted at the active time, so other DCI 4110 formats (e.g., DCI Format 0_0/1_0, etc.) can be set to have the same size. Even if the above-described [Condition 1] or [Condition 2] is not satisfied, the size of the WUS may not be aligned to have the same size as other DCI 1100 formats (eg, DCI format 0_0/1_0, etc.) .

Alternatively, if the WUS does not satisfy the above-described [Condition 1] or [Condition 2], the size of the WUS 810 is the same size as other DCI 1100 formats (eg, DCI format 0_0/1_0, etc.) Can be arranged to have In order to align the size of the transmitted DCI, if the DCI corresponding to the WUS 810 is smaller in size than the other DCI 4110 formats, 0 can be inserted (Zero-padding), and the DCI corresponding to the WUS 810 When is larger in size than other DCI 4110 formats, bits corresponding to some fields may be removed (Truncation).

According to an embodiment, by aligning the size of the DCI corresponding to the WUS 4810, the number of blind decoding for the search space of the terminal can be reduced to save power of the terminal.

Additionally, in an embodiment, when the WUS occasion is located within the active time (4605), when the WUS indicates that the terminal wakes up on the DRX occasion, the terminal starts drx-ShortCycletimer and may operate in a short DRX cycle. . When the WUS indicates that the terminal wakes up on the DRX occasion, it means that there is data to be transmitted on the corresponding DRX occasion, so the terminal can immediately operate in a short DRX cycle.

According to an embodiment, the WUS may indicate the operation of the terminal on a DRX occasion related to WUS. In order for the WUS to indicate the operation of the terminal in the DRX occasion related to the WUS, a method for mapping the WUS and the DRX occasion is required.

<Example 4-3-1>

Hereinafter, in the embodiment 3-1, a method of one-to-one mapping between WUS and DRX occasions will be described.

24 is a diagram for explaining a method of one-to-one mapping between WUS and DRX occasion according to an embodiment of the present disclosure.

Referring to FIG. 24, in an embodiment, one WUS 4811, 4812, 4813 and one DRX occasion 4605 may be mapped in a one-to-one mapping (one-to-one mapping). More specifically, one WUS instructs the UE to wake-up on one DRX occasion related to the WUS, or instructs not to skip one DRX occasion related to the WUS (do not skip), or , It may be instructed to monitor the PDCCH on one DRX occasion related to the corresponding WUS, or start the drx-onDurationTimer on one DRX occasion related to the corresponding WUS.

In addition, one WUS indicates that the terminal does not wake up on one DRX occasion related to the corresponding WUS, or does not indicate that the terminal does not wake on one DRX occasion related to the corresponding WUS (do not wake-up). ), or not to monitor the PDCCH on one DRX occasion related to the WUS, instructing not to start the drx-onDurationTimer on one DRX occasion related to the WUS, or to skip one DRX occasion related to the WUS (skip ).

In one embodiment, when one WUS (4811, 4812, 4813) and one DRX occasion are mapped on a one-to-one basis, the WUS cycle and the DRX cycle (or DRX-LongCycle) may be the same.

<Example 4-3-2>

Hereinafter, in the 4-3-2 embodiment, a method of one-to-one mapping between WUS and DRX occasions will be described.

25 is a diagram for explaining a method of one-to-N mapping between WUS and DRX occasion according to an embodiment of the present disclosure.

Referring to FIG. 25, in one embodiment, one WUS 4810 and a plurality of DRX occasions 4605-1, 4605-2, and 4605-3 may be mapped in a 1-to-N manner (one-to-N mapping) (N is a natural number). More specifically, one WUS instructs the UE to wake-up in one or more DRX occasions related to the corresponding WUS, or to do not skip a plurality of DRX occasions related to the corresponding WUS. Alternatively, it may be instructed to monitor the PDCCH on a plurality of DRX occasions related to the corresponding WUS, or to start the drx-onDurationTimer on a plurality of DRX occasions related to the corresponding WUS.

In addition, one WUS does not indicate that the terminal will wake up on a plurality of DRX occasions related to the corresponding WUS or that the terminal does not wake on a plurality of DRX occasions related to the corresponding WUS (do not wake-up) ) Or, do not monitor the PDCCH on multiple DRX occasions related to the WUS, or instruct not to start drx-onDurationTimer on multiple DRX occasions related to the WUS, or skip multiple DRX occasions related to the WUS (skip ).

In one embodiment, when one WUS (4810) and a plurality of DRX occasions (4605) are mapped to 1 to N, the same contents are indicated in a plurality of DRX occasions (4605-1, 4605-2, 4605-3) It can be done, and the contents of the instruction can be changed for each DRX occasion (4605-1, 4605-2, 4605-3). For example, in FIG. 13, one WUS 4810 may indicate that the terminal will wake-up for all of the DRX occasions 4605-1, 4605-2, and 4605-3. In addition, one WUS (4810) wakes up the terminal on the DRX occasion (4605-1), skips the DRX occasion on the DRX occasion (4605-2), and wakes the terminal on the DRX occasion (4605-3). You can also instruct.

In an embodiment, N may be a preset value. For example, N may be a fixed value in relation to the WUS monitoring operation in the communication system, and when the base station provides WUS configuration information to the terminal through higher layer signaling (RRC signaling, MIB, SIB), the WUS configuration information It can also be an included value.

In addition, in an embodiment, N may be a value indicated by WUS. In this case, N may be indicated as a natural number or may be indicated in the form of a bitmap. For example, after the WUS occasion, when three DRX occasions exist, the base station may indicate that N is indicated in the form of a bitmap such as 101 to indicate that the WUS indicates operation in the first and third DRX occasions. Alternatively, the base station may indicate that N is indicated in the form of a bitmap such as 111 to indicate that the WUS indicates operation in the first, second, and third DRX occasions.

Furthermore, in one embodiment, N may be implicitly indicated by the WUS occasion and the DRX occasion. For example, the UE may monitor the PDCCH assuming that all DRX occasions located between two adjacent WUS occasions are temporally associated with the WUS located in front of them. That is, the WUS received on one WUS occasion may be mapped to all DRX occasions before the next WUS occasion after this WUS occasion. More specifically, the WUS located in front of time instructs to wake up at all DRX occasions located in the next WUS occasion and monitor the PDCCH, or instruct not to wake up at all DRX occasions located between two adjacent WUS occasions, or set DRX occasions. It can also be instructed to wake up only and monitor the PDCCH. For example, if there are 7 DRX occasions between a first WUS occasion located in front of the time and a second WUS occasion adjacent to or immediately following the first WUS occasion, N=7 may be. In this case, the WUS received on the first WUS occasion may be implicitly mapped to the 7th DRX occasion. In addition, the WUS received on the first WUS occasion is instructed to wake up on all DRX occasions and monitor the PDCCH for 7 DRX occasions between the second WUS occasion, or not to wake up on all DRX occasions, or a set DRX occasion It can also be instructed to wake up only and monitor the PDCCH. However, this is only an example, and is not limited thereto, and N may be implicitly indicated by various methods.

Additionally, according to an embodiment of the present disclosure, it is possible to indicate N based on the time interval between adjacent WUS occasions. For example, when the time interval between adjacent WUS occasions is larger or smaller than a specific value, N may be implicitly or explicitly set.

In one embodiment, the WUS may indicate the operation of the terminal on a DRX occasion related to WUS. At this time, the WUS may indicate whether or not all of the terminals are awakened in a DRX occasion related to 1 bit, or may indicate whether to awaken in each DRX occasion related to an N bit. Alternatively, it is possible to provide additional information, for example, information on when to wake up, as well as whether or not the terminal wakes up with K bit.

<Example 4-4-1>

Hereinafter, in the 4-4-1 embodiment, a method of indicating whether or not the terminal wakes up with 1 bit will be described.

In one embodiment, the WUS may indicate whether or not the terminal wakes up with 1 bit when indicating the operation of the terminal in a DRX occasion related to WUS. According to an embodiment, overhead can be reduced by transmitting only a minimum amount of data.

In addition, in one embodiment, indicating whether or not the terminal wakes up indicates that the terminal wakes up at a DRX occasion related to the WUS, or does not skip a DRX occasion related to the corresponding WUS (do not skip ), monitoring the PDCCH on a DRX occasion related to the WUS, or instructing to start the drx-onDurationTimer on a DRX occasion related to the WUS. Or, do not indicate that the UE will wake up on a DRX occasion related to the WUS, or do not wake-up from a DRX occasion related to the WUS, or DRX related to the WUS It may include not monitoring the PDCCH on the occasion, instructing not to start the drx-onDurationTimer on the DRX occasion related to the WUS, or instructing to skip the DRX occasion related to the WUS.

FIG. 26 is a diagram for explaining a method in which a WUS and a DRX occasion are mapped to 1 to N, and a WUS indicates whether a UE wakes up with 1 bit according to an embodiment of the present disclosure.

In one embodiment, when the WUS indicates whether the terminal wakes up with 1 bit, and the WUS and the DRX occasion are mapped 1 to N, the WUS may be indicated in the form of a bitmap 4401. Referring to FIG. 14, a bitmap is composed of N bits and indicates whether to wake up from a DRX occasion in which a UE is mapped to 0 or 1 in a field (4410, 4420, 4430, ....N) corresponding to each bit. can do.

<Example 4-4-2>

In the following embodiment 4-4-2, the WUS includes information on whether the terminal wakes up with K bits and additional information, e.g., information on at which point the terminal wakes up during the active time 4605 (time to wake up). Let's explain how to provide the back.

In one embodiment, the size of a field indicating additional information, that is, a K value may be indicated by the base station. The K value may be provided to the UE through higher layer signaling (RRC signaling, MIB, SIB) of the base station. In addition, additional information includes information indicating at which point the terminal will wake up during the active time (4605), information indicating at which point it will not wake up, information related to WUS setting change (e.g., instruction to perform a default operation), etc. It may include. In addition, in one embodiment, indicating whether or not the terminal wakes up indicates that the terminal wakes up at a DRX occasion related to the WUS, or does not skip a DRX occasion related to the corresponding WUS (do not skip ), monitoring the PDCCH on a DRX occasion related to the WUS, or instructing to start the drx-onDurationTimer on a DRX occasion related to the WUS. Or, do not indicate that the UE will wake up on a DRX occasion related to the WUS, or do not wake-up from a DRX occasion related to the WUS, or DRX related to the WUS It may include not monitoring the PDCCH on the occasion, instructing not to start the drx-onDurationTimer on the DRX occasion related to the WUS, or instructing to skip the DRX occasion related to the WUS.

In the following, for convenience of description, additional information will be described as an example of information on which time the terminal will wake up during the active time 4605. However, the present invention is not limited thereto, and additional information may include various types of information.

In an embodiment, information on whether the terminal will wake up and information on when the terminal wakes up during an active time 4605 may be included in one field composed of K bits. With reference to FIG. 27, information on which time the terminal will wake up during the active time 4605 will be described.

FIG. 27 is a diagram for explaining a method of indicating information on at which point a terminal wakes up during an active time by a WUS according to an embodiment of the present disclosure.

Referring to FIG. 27, the active time 4605 is divided into four time intervals, and each time interval may be indicated by two bits. More specifically, each time period may be indicated by code points of 00, 01, 10, and 11. In one embodiment, the WUS 810 may include information on whether or not the terminal will wake up and information on a time interval in which the terminal will wake up. Taking the situation of FIG. 15 as an example, the WUS may be configured as a total of 3 bits by indicating information on whether or not the terminal will wake up in 1 bit and information on the time interval in which the terminal will wake up in 2 bits. That is, it can be K = 3. In this case, the time interval may be each of the N DRX occasions mapped to the WUS occasion.

Returning to the description of embodiment 4-4-2 again, in one embodiment, in the WUS, information on whether the terminal wakes up and information on at which point the terminal wakes up during the active time (4605) are separated from each other. Can be included in the field. In this case, as in the 3-2 embodiment, each field may indicate an operation for a plurality of DRX occasions corresponding to WUS. Further, in an embodiment, each field may be represented as a bitmap. For example, when the WUS is mapped to 5 DRX occasions (N=5), whether the UE wakes up at each DRX occasion may be indicated by a 5-bit bitmap. In addition, additional information, for example, information on at which point the terminal will wake up during the active time 4605 may be indicated as a K bit bitmap.

In an embodiment, the interpretation of the region indicated by the bitmap may vary according to a relationship between an N value indicating how many DRX occasions WUS is mapped to and a K value indicating the size of additional information. For example, when N=5 and K=3, some of the K bits indicate information on two DRX occasions according to ceil(N/K) = 2, and the rest are Floor(N/K) According to =1, information on one DRX occasion can be indicated.

In one embodiment, WUS may be transmitted for one terminal or for a plurality of terminals. More specifically, WUS may include PDCCH monitoring configuration information for one terminal or PDCCH monitoring configuration information for a plurality of terminals. That is, WUS may be transmitted in units of a plurality of terminals.

In one embodiment, the base station may transmit WUS through Common Search Space (CSS), and PDCCH monitoring configuration information for a plurality of terminals may be included in one WUS. For example, one WUS may include a scaling factor for a PDCCH monitoring period for each terminal. In addition, a cell to which PDCCH monitoring configuration information is mapped may be identified according to a bit position in the WUS.

When the WUS only indicates whether or not the terminal wakes up with 1 bit, overhead can be reduced, but it is difficult to deliver a large amount of information. According to an embodiment, the size of data transmitted to the WUS is increased to K bits, and additional information is transmitted together, thereby controlling the WUS operation in more detail.

28 is a diagram illustrating a relationship between a WUS monitoring operation and a short DRX according to an embodiment of the present disclosure.

Referring to FIG. 28, when a UE operates in a Long DRX cycle and receives a predetermined event, for example, a PDCCH indicating new uplink transmission or downlink transmission at an active time 605, It can be operated with short DRX cycle. This short DRX cycle can be applied as an option. More specifically, the terminal starts drx-ShortCycleTimer at the expiration time of the previous drx-onDurationTimer or drx-InactivityTimer, and operates in a short DRX cycle until the drx-ShortCycleTimer expires. Thereafter, when the drx-ShortCycleTimer expires, the terminal operates in a Long DRX cycle again.

It is necessary to determine the relationship between such short DRX cycle operation and WUS monitoring operation.

<Example 4-5-1>

In the following embodiment 4-5-1, when both the short DRX cycle operation and the WUS monitoring operation are set, a method of performing only one of the short DRX cycle operation and the WUS monitoring operation will be described.

In an embodiment, a short DRX cycle operation and a WUS monitoring operation may not be configured in the terminal at the same time. If any one operation is set first, the terminal cannot set another operation or may ignore configuration information even if it receives configuration information from the base station.

Alternatively, in an embodiment, when the short DRX cycle operation and the WUS monitoring operation are simultaneously set in the terminal, the terminal may determine that one of the two operations is released. That is, when the short DRX cycle operation and the WUS monitoring operation are simultaneously configured in the terminal, only the short DRX cycle operation or only the WUS monitoring operation may be performed. In this case, one of the operations may be canceled according to the time sequence in which the short DRX cycle operation and the WUS monitoring operation are set. For example, a previously set operation may be canceled and the terminal may perform only a later set operation, or a later set operation may be canceled and the terminal may perform only the previously set operation.

In an embodiment, the WUS monitoring operation operates only in relation to the long DRX cycle, and when the short DRX cycle operation is set, the WUS monitoring operation may not be performed. More specifically, when drx-ShortCycleTimer is running, the terminal may not perform a monitoring operation for WUS.

<Example 4-5-2>

In the following embodiment 4-5-2, when both the short DRX cycle operation and the WUS operation are set, a method of not performing the WUS monitoring operation will be described.

In an embodiment, when the terminal operates in a short DRX cycle, the terminal may not perform the WUS monitoring operation. That is, while the drx-ShortCycleTimer is running, it may not wake up on the WUS occasion. More specifically, the UE may not monitor the PDCCH in order to detect the DCI corresponding to the WUS in the corresponding WUS occasion. Thereafter, when the drx-ShortCycleTimer is stopped, or when the drx-ShortCycleTimer expires, the terminal may resume the WUS monitoring operation again. In addition, in an embodiment, when the terminal operates in a Long DRX cycle again, the terminal may resume the WUS monitoring operation again. When the UE resumes the WUS monitoring operation again, it wakes up from the WUS occasion and monitors the PDCCH to detect the DCI corresponding to the WUS.

In one embodiment, when the terminal operates in a short DRX cycle, the terminal can always wake up on a DRX occasion and monitor the PDCCH. As described above, when the terminal operates in a short DRX cycle, if the WUS monitoring operation is not performed, it is not possible to know whether data is scheduled to be transmitted on the DRX occasion corresponding to the corresponding WUS occasion. You can always wake up on the DRX occasion and monitor the PDCCH. Furthermore, even if the UE operates in the short DRX cycle and then operates in the Long DRX cycle again, in order to detect the DCI corresponding to WUS, the UE always wakes up in the DRX occasion corresponding to the WUS occasion that does not monitor the PDCCH, and can monitor the PDCCH.

<Example 4-5-3>

In the following embodiment 4-5-3, when both the short DRX cycle operation and the WUS monitoring operation are set, a method of performing both the WUS short DRX cycle operation and the WUS monitoring operation will be described.

In an embodiment, in order to apply the WUS monitoring operation during the short DRX cycle operation, new WUS configuration information may be applied. In this case, the WUS monitoring operation performed in the long DRX cyle may be referred to as Long-WUS, and the WUS monitoring operation performed in the short DRX cyle may be referred to as short-WUS. Long-WUS and short-WUS may have different WUS offset and WUS period. In one embodiment, the base station may start a short-on duration timer to the terminal, like Long-WUS. More specifically, the base station may provide short-WUS configuration information to the terminal through higher layer signaling (RRC signaling, MIB, SIB). Furthermore, when operating in short-WUS, the DCI corresponding to short-WUS may have a DCI format different from the DCI corresponding to Long-WUS. In this case, the DCI corresponding to the short-WUS may be scrambled with an RNTI different from the DCI corresponding to the Long-WUS. In addition, DCI corresponding to short-WUS may be transmitted in a control region in which DCI corresponding to Long-WUS is transmitted, that is, in a control region different from CORSET. In addition, the DCI corresponding to the short-WUS may be transmitted through a search space different from the search space in which the DCI corresponding to the Long-WUS is transmitted.

In one embodiment, the short-WUS cycle may vary according to the length of the short DRX cycle. More specifically, by comparing a preset value or a value set by the base station with a drx-ShortCycletimer value, the short-WUS period may be differently set according to the result. Here, drx-ShortCycletimer value = M * drx-ShortCycle (M = natural number). For example, when a preset value or a value set by the base station is X, if drx-ShortCycletimer value <X, short-WUS period = N * drx-ShortCycle (N is a natural number). In this case, one WUS and a plurality of DRX occasions may be mapped 1-to-N according to the value of N (one-to-N mapping). In this case, the short-WUS period and/or drx-ShortCycle may be set by time, number of subframes, number of slots, and the like.

In an embodiment, N may be a preset value. For example, N may be a fixed value in relation to the short-WUS monitoring operation in the communication system, and when the base station provides short-WUS configuration information to the terminal through higher layer signaling (RRC signaling, MIB, SIB), It may be a value included in the short-WUS configuration information.

Also, in an embodiment, N may be a value indicated by short-WUS. In this case, N may be indicated as a natural number or may be indicated in the form of a bitmap. For example, after the short-WUS occasion, if there are three DRX occasions, the base station indicates that N is indicated in the form of a bitmap such as 101 to indicate that the short-WUS indicates operation in the first and third DRX occasions. Can be indicated. Alternatively, the base station may indicate that N is indicated in the form of a bitmap such as 111 to indicate that the short-WUS indicates operation in the first, second, and third DRX occasions.

Furthermore, in one embodiment, N may be implicitly indicated by the short-WUS occasion and the DRX occasion. For example, the UE may wake up for all DRX occasions located between two adjacent short-WUS occasions and monitor the PDCCH.

In addition, in an embodiment, when a preset value or a value set by the base station is X, when drx-ShortCycle ≥ X, short-WUS period = drx-ShortCycle. In this case, one WUS and one DRX occasion may be mapped on a one-to-one basis (one-to-one mapping). In this case, the short-WUS period and/or drx-ShortCycle may be set by time, number of subframes, number of slots, and the like.

In an embodiment, the terminal may apply the WUS monitoring operation as it is using the existing WUS configuration information even during the short DRX cycle operation. In this case, when the WUS indicates that the UE wakes up on a DRX occasion or if WUS is not received, the UE maintains a short DRX cycle and may perform a short DRX cycle operation. In addition, when the WUS does not indicate that the terminal wakes up on the DRX occasion, the terminal may no longer start an on duration timer (drx-onDurationTimer) afterwards. Furthermore, the terminal may stop the drx-ShortCycletimer and then operate in a Long DRX cycle. When the WUS indicates that the UE wakes up on the DRX occasion, it means that there is no data to be transmitted on the DRX occasion, so the UE can immediately operate in a Long DRX cycle.

In an embodiment of the present disclosure, the WUS period means a period of occurrence of a WUS occasion. Therefore, the terminal should wake up every time in the WUS period and monitor the PDCCH based on the WUS configuration information provided by the base station. In comparison, the base station does not always have to transmit WUS in the WUS period. The base station may transmit WUS only when there is information to be transmitted, or may transmit WUS every WUS period. Therefore, it is necessary to determine how to transmit WUS using the WUS cycle.

<Example 4-6-1>

In the following embodiment 4-6-1, a method of transmitting the WUS only when the terminal needs to wake up or when there is a change will be described.

In one embodiment, the terminal wakes up every time in the WUS period and monitors the PDCCH based on the WUS configuration information provided by the base station, but the base station can transmit the WUS only when there is information to be transmitted. For example, the base station can transmit the WUS only when the terminal needs to wake up or when there is a change. If there is a change, it means, for example, that the UE receives the WUS mapped to a plurality of DRX occasions, is operating according to the received WUS instruction, and another operation is set on the DRX occasion mapped to the WUS. can do. More specifically, it may mean a case in which the WUS instructs the UE not to wake up on the DRX occasion of a specific time, but the UE needs to wake up because data to be transmitted is generated at the specific time before the feature time arrives.

In one embodiment, at the time when WUS should be received, if the PDCCH is monitored but DCI corresponding to the WUS is not detected, the terminal may operate according to an instruction of the previously received WUS or perform a default operation. The default operation may be predefined or may be preset by the base station. The default behavior may include always waking up. In addition, in an embodiment, the terminal may perform a default operation when WUS is not received for a predetermined period or longer. Here, the predetermined period may be predefined or may be set in advance by the base station.

<Example 4-6-2>

Hereinafter, in embodiment 4-6-2, a method in which WUS is always transmitted in a WUS period will be described.

In one embodiment, the base station may wake up every time in the WUS period and transmit WUS to the terminal. In this case, the WUS may indicate whether or not the terminal will wake up with 1 bit, or may provide additional information, for example, information on when to wake up, along with whether or not the terminal will wake up with K bit.

In one embodiment, when the WUS is to be received, that is, in the WUS period, if the PDCCH is monitored, but the DCI corresponding to the WUS is not detected, the terminal operates according to the previously received WUS instruction or performs a default operation. I can. The default operation may be predefined or may be preset by the base station. The default behavior may include always waking up. In addition, in an embodiment, the UE may skip a DRX occasion related to an unreceived WUS.

According to an embodiment of the present disclosure, the WUS monitoring operation may be applied even when a carrier aggregation (CA) is set or a bandwidth part (BWP) is set. More specifically, WUS may be transmitted for each cell, for each cell group, and for each bandwidth part or a specific bandwidth part. When CA or BWP is set, a unit group through which WUS is transmitted will be described.

<Example 4-7-1>

Hereinafter, in Embodiment 7-1, a method of transmitting WUS for each cell group including a plurality of cells will be described.

According to an embodiment of the present disclosure, WUS may be transmitted for each cell group including a plurality of cells. That is, one WUS corresponding to a plurality of cells may be transmitted, and a terminal may receive a WUS corresponding to a plurality of cells by monitoring one control region or a search region.

29 is a diagram for describing a method of transmitting WUS for each cell group including a plurality of cells according to an embodiment of the present disclosure.

As an example, WUS may be transmitted from two cell groups MCG (Master Cell Gruop) and SCG (Sencondary Cell Group) PCell (Priamry Cell) and PSCell (Primary SCell) respectively, and WUS transmitted from each cell group is the corresponding cell It is possible to control the PDCCH monitoring operation of cells existing in the group.

Referring to FIG. 29, one WUS 810 may be transmitted in a Primary cell (PCell) or a Primary SCell (PSCell) (Serving Cell #0) 4710. One WUS 810 may control PDCCH monitoring settings in Serving Cell #0 (4710), Serving Cell #1 (4720), and Serving Cell #2 (1730). Serving Cell #0(1710), Serving Cell #1(1720) and Serving Cell # using WUS(810) transmitted from PCell(Primary cell) or PSCell(Primary SCell)(Serving Cell #0)(1710) In the DRX occasion related to the WUS 810 of 2 (1730), the UE instructs to wake-up, or does not skip the DRX occasion related to the WUS 810 (do not skip), or WUS ( 810) can be instructed to monitor the PDCCH at the DRX occasion related to the WUS 810 or to start the drx-onDurationTimer 615 at the DRX occasion related to the WUS 810. Or, in the DRX occasion related to the WUS 810 does not indicate that the terminal will wake up (wake-up), or in the DRX occasion related to the WUS 810 indicates that the UE does not wake up (do not wake-up), or WUS Do not monitor the PDCCH on the DRX occasion related to (810), or instruct not to start the drx-onDurationTimer (615) on the DRX occasion related to WUS (810), or to skip the DRX occasion related to WUS (810). You may be instructed to do it.

According to an embodiment of the present disclosure, a cross-carrier indicator may be included in one WUS 4810, and a cell to control PDCCH monitoring configuration may be indicated through a cross-carrier indicator in the WUS 4810. I can. Alternatively, the cell to control the PDCCH monitoring configuration may be indicated through a cross-carrier indication field (CIF). In addition, PDCCH monitoring configuration in one WUS 4810 may be applied in common to all cells. In an embodiment of the present disclosure, when a cross-carrier indicator or CIF is configured, WUS may be transmitted from a cell that controls the PDCCH monitoring configuration of another cell using the cross-carrier indicator or CIF. That is, when the P(S)Cell(Primary SCell)(Serving Cell #0)(1710) uses a cross-carrier indicator or CIF to control the PDCCH monitoring setting of the Serving Cell #1(1720), WUS is P( It may be transmitted in the S) Cell (Primary SCell) (Serving Cell #0) 1710.

According to an embodiment of the present disclosure, all of the PDCCH monitoring configuration information or WUS configuration information for a plurality of cells may be included in one WUS 4810. For example, WUS(4810)dpsms PDCCH monitoring setting information for a CA configured cell or a CA activated cell or WUS setting information indicating a cell index Can be provided as More specifically, the WUS 810 may include a parameter indicating or determining the index of cells to which the PDCCH monitoring configuration information or the WUS configuration information is to be applied. The PDCCH monitoring configuration information or the WUS configuration information may be applied to cells having a cell index indicated or determined by a parameter included in the WUS 4810. According to an embodiment, when PDCCH monitoring configuration information or WUS configuration information for a plurality of cells is included in one WUS 4810, PDCCH monitoring configuration information or WUS configuration information is mapped according to the bit position in the WUS 4810 It is also possible to identify the cell to be used. To this end, the base station may set the position of the bit controlling each cell in the WUS 810 to the terminal by higher layer signaling (eg, RRC signaling). The UE can know which cell each bit in the received WUS 810 controls based on the PDCCH monitoring configuration information or WUS configuration information received from the base station, and accordingly controls the PDCCH monitoring based on WUS for multiple cells ( For example, refer to the WUS-related functions described above, such as whether to monitor the PDCCH on a DRX occasion related to WUS). In addition, one WUS 810 may include a scaling factor for a PDCCH monitoring period in order of cell index.

In addition, a bandwidth part in which one WUS for a plurality of cells is transmitted may be set by the base station. The base station may configure a bandwidth part for receiving one WUS for a plurality of cells by using an identifier for the bandwidth part.

<Example 4-7-2>

Hereinafter, in the embodiment 4-7-2, a method of transmitting WUS for each cell will be described.

According to an embodiment of the present disclosure, WUS may be transmitted in each cell. That is, a WUS corresponding to each cell may be transmitted, and the terminal may receive a WUS corresponding to each cell by monitoring a control region or a search region corresponding to each cell.

30 is a diagram for describing a method of transmitting WUS for each cell according to an embodiment of the present disclosure.

Referring to FIG. 30, the first WUS 811 may be a WUS 4811 transmitted from a PCell (Primary cell) or PSCell (Primary SCell) (Serving Cell #0) 4711, and the first WUS 4811 May control the PDCCH monitoring configuration in a Primary cell (PCell) or a Primary SCell (PSCell) 4711. In addition, the second WUS 4812 may be the WUS 4812 transmitted from the Serving Cell #2 4771, and the second WUS 4812 may control the PDCCH monitoring setting in the Serving Cell #2 4771. have. That is, by using each WUS (4811, 4812) transmitted from each cell (4711, 4731), the terminal will wake on the DRX occasion related to the WUS (4811, 4812) of each cell (4711, 4731). -up), instructing not to skip DRX occasions related to WUS (4811, 4812), monitoring PDCCH in DRX occasions related to WUS (4811, 4812), 4812) can be instructed to start drx-onDurationTimer on a related DRX occasion. Or, does not indicate that the terminal will wake up on a DRX occasion related to WUS (4811, 4812), or indicate that the terminal will not wake on a DRX occasion related to WUS (4811, 4812) (do not wake-up) ), or not to monitor PDCCH on DRX occasions related to WUS (4811, 4812), or instructing not to start drx-onDurationTimer on DRX occasions related to WUS (4811, 4812), or DRX occasions related to WUS (4811, 4812) You can also tell it to skip.

If cross-carrier scheduling is configured, the base station may control the PDCCH monitoring configuration of another cell using the cross-carrier indicator. Referring to FIG. 18, when cross-carrier scheduling is configured, the UE is Serving Cell #1 based on a cross-carrier indicator or a cross-carrier indication field (CIF) transmitted from Serving Cell #0 (4711) and a first WUS (4811). It is also possible to control the PDCCH monitoring configuration at (4821). In other words, when the cross-carrier indicator or CIF is configured, the WUS may be transmitted from a cell that controls the PDCCH monitoring configuration of another cell by using the cross-carrier indicator or CIF. This may be transmitted from the cell (this is referred to as the first cell) in which the WUS, which controls the cell configured for cross-carrier scheduling (this is referred to as the second cell), schedules the second cell. For example, when the P(S)Cell (Primary SCell)(Serving Cell #0)(4711) uses a cross-carrier indicator or CIF to control the PDCCH monitoring setting of Serving Cell #1(4721), WUS( 4811) may be transmitted in the PSCell (Primary SCell) (Serving Cell #0) 47110.

When cross-carrier scheduling is set, control by the WUS 4811 in the WUS 4811, as described above, when all of the PDCCH monitoring configuration information or WUS configuration information for a plurality of cells are included in one WUS 4811 PDCCH monitoring configuration information or WUS configuration information for a plurality of cells may be included. For example, the WUS 4811 may be provided with PDCCH monitoring configuration information or WUS configuration information for a plurality of cells in a form indicating a cell index. More specifically, the WUS 4811 may include a parameter indicating or determining the index of cells to which the PDCCH monitoring configuration information or the WUS configuration information is to be applied. The PDCCH monitoring configuration information or the WUS configuration information may be applied to cells having a cell index indicated or determined by a parameter included in the WUS 4811. According to an embodiment, when PDCCH monitoring configuration information or WUS configuration information for a plurality of cells is included in one WUS 4811, PDCCH monitoring configuration information or WUS configuration information is mapped according to the bit position in the WUS 4811 It is also possible to identify the cell to be used. To this end, the base station may set the position of the bit controlling each cell in the WUS 4810 to the UE by higher layer signaling (eg, RRC signaling). The terminal can know which cell each bit in the received WUS 4810 controls based on the configuration information received from the base station, and thus controls the PDCCH monitoring based on WUS for multiple cells (e.g., WUS-related (Refer to the WUS-related functions described above, such as whether to monitor the PDCCH on the DRX occasion). In addition, one WUS 4811 may include a scaling factor for a PDCCH monitoring period in order of cell index.

In addition, when the WUS is transmitted in each cell, the WUS offset in each cell may be different. That is, the base station may separately set the WUS offset for each cell or may set an additional offset for each cell. In addition, the period of WUS in each cell may also be different.

In addition, the bandwidth parts through which WUS is transmitted in each cell may be the same or different. According to an embodiment of the present disclosure, the base station may be configured by using an identifier for a bandwidth part in which WUS for each cell is transmitted.

<Example 4-7-3>

Hereinafter, in embodiment 4-7-3, a method of transmitting WUS in units of bandwidth parts will be described.

According to an embodiment of the present disclosure, when a plurality of bandwidth parts are configured, WUS may be transmitted in units of activated bandwidth parts. That is, a WUS corresponding to each bandwidth part may be transmitted, and the terminal may receive a WUS corresponding to each bandwidth part by monitoring a control area or a search area corresponding to each bandwidth part.

According to an embodiment of the present disclosure, when a plurality of bandwidth parts are configured, WUS may be transmitted through a specific bandwidth part for transmission of WUS, for example, a wake up bandwidth part. Wake up bandwidth part is another bandwidth part. It may be distinguished from and may have a configuration suitable for wake up PDCCH, such as including wake up CORESET and wake up discovery space setting. In one embodiment, the bandwidth part switching indicator (BWP switching indicator) or the bandwidth part switching information (BWP switching information) may operate as a trigger of the WUS monitoring operation. For example, if the terminal switches the bandwidth part based on the bandwidth part switching indicator or bandwidth part switching information while monitoring the bandwidth part for which WUS is not set, WUS monitoring operation if WUS is set in the switched bandwidth part Can begin. In addition, in an embodiment, when the terminal is operating in a bandwidth part in which WUS is not transmitted, the base station may transmit an explicit indication to the terminal to confirm WUS. Furthermore, in an embodiment, when the terminal is operating in a bandwidth part in which WUS is not transmitted, when the DRX is applied and the inactive time arrives due to the expiration of the on-duration timer, the terminal is Can switch to the part of the bandwidth that is transmitted.

According to an embodiment of the present disclosure, PDCCH monitoring configuration information for a plurality of bandwidth parts may be included in one WUS 4810. For example, the WUS 4810 may be provided with PDCCH monitoring configuration information or WUS configuration information for a number of bandwidth parts in a form indicating a bandwidth part index (BWP Index). More specifically, the WUS 4810 may include a parameter indicating or determining the index of bandwidth parts to which the PDCCH monitoring configuration information or the WUS configuration information is to be applied. The PDCCH monitoring configuration information or the WUS configuration information may be applied to cells having a bandwidth part index indicated or determined by a parameter included in the WUS 4810. According to an embodiment, when PDCCH monitoring configuration information or WUS configuration information for a plurality of cells is included in one WUS 4810, PDCCH monitoring configuration information or WUS configuration information is mapped according to the bit position in the WUS 4810 It is also possible to identify the part of the bandwidth to be used. In addition, one WUS 4810 may include a scaling factor for a PDCCH monitoring period in the order of a bandwidth part index.

The detailed embodiments described above may be operated in combination with each other. For example, the period and offset of the WUS may be set in association with the DRX, or may be set independently, and if the WUS Occasion is located within the active time, WUS may or may not be monitored, and WUS and DRX occasions This one-to-one mapping may be performed or one-to-one mapping may be performed, and WUS may be indicated by 1-bit or K-bit, and both short DRX and WUS may be used, or only one of them may be used. , WUS may be transmitted only when the terminal wakes up, or may be always transmitted, and WUS may be transmitted for each cell or bandwidth part, or may be transmitted in a cell group unit, that is, not limited to the above example and a combination of each of the embodiments This is possible.

Also, the setting of WUS may correspond to the setting of at least some of the GTS. For example, settings regarding the DCI format, RNTI, period, and offset of the WUS may correspond to settings related to the DCI format, RNTI, period, and offset of the GTS. In addition, as described above, all of the embodiments related to WUS may be applicable to uni-POSS.

31 is a diagram illustrating a system for providing power saving signal setting information according to an embodiment of the present disclosure.

As described above, the base station may notify the terminal of the configuration information for the power saving signal by using higher layer signaling (MIB, SIB, RRC, etc.) (step 3110).

According to an embodiment of the present disclosure, the setting information for the power saving signal includes control region information, search space information, occassion period information, offset information, DRX period information, and DCI format corresponding to the power saving signal. It may include at least one of information, DCI size information, RNTI information, power saving signal mapping setting information, and an operation when the power saving signal is missed. Of course, it is not limited to the above example, and the setting information for the power saving signal may include all information for detecting the power saving signal or analyzing the power saving signal. Since the setting information for the power saving signal corresponds to that described above, a detailed description will be omitted.

Further, according to an embodiment of the present disclosure, the base station may transmit a power saving signal to the terminal based on configuration information for the power saving signal notified to the terminal. The terminal may acquire a power saving signal by monitoring the PDCCH based on the configuration information for the received power saving signal (step 3120).

According to an embodiment of the present disclosure, the power saving signal may include at least one of downlink control channel monitoring period information of the terminal, DRX-related configuration information, and state change instruction information of the terminal. As described above, the state change instruction information of the terminal may be information to terminate the on-duration or information to indicate to switch to the inactive state of the terminal. Contents included in the power saving signal correspond to those described above, so detailed descriptions are omitted.

According to an embodiment of the present disclosure, the terminal may control the PDCCH monitoring setting based on the received power saving signal (step 3130).

For example, the terminal may instruct to perform PDCCH monitoring based on the received power saving signal. More specifically, the terminal may perform monitoring on the PDCCH from a time point after detecting the power saving signal. For example, the terminal in the inActive state may switch to the Active state in order to monitor the PDCCH from a predetermined time after detecting the power saving signal.

As another example, the UE may not perform monitoring on the PDCCH for a specific time based on the received power saving signal. For example, a terminal in an active state may switch to an inActive state (eg, a power saving mode or a sleep mode) without performing monitoring on the PDCCH from a predetermined point after detecting the power saving signal.

As another example, the terminal may change configuration information for PDCCH monitoring based on the received power saving signal. As described above, the configuration information for the PDCCH may include at least one of parameters for the control region of [Table 7] and/or at least one of parameters for the search space of [Table 8]. The UE may monitor the PDCCH from a predetermined point in time based on the changed configuration information for PDCCH monitoring.

32 is a flowchart of an operation of a terminal controlling a PDCCH monitoring configuration according to an embodiment of the present disclosure.

In step 3220, configuration information for a power saving signal may be received from the base station.

According to an embodiment of the present disclosure, the setting information for the power saving signal includes control region information, search space information, occassion period information, offset information, DRX period information, and DCI format corresponding to the power saving signal. It may include at least one of information, DCI size information, RNTI information, power saving signal mapping setting information, and an operation when the power saving signal is missed. Of course, it is not limited to the above example, and the setting information for the power saving signal may include all information for detecting the power saving signal or analyzing the power saving signal. Since the setting information for the power saving signal corresponds to that described above, a detailed description will be omitted.

In addition, according to an embodiment of the present disclosure, the power saving signal may include all of the power saving signal and corresponding downlink control information, that is, the power saving signal may include all of the aforementioned WUS, GTS, and uni-POSS. I can.

In operation 3240, the power saving signal from the base station may be monitored based on the configuration information for the power saving signal.

According to an embodiment of the present disclosure, the power saving signal may include at least one of downlink control channel monitoring period information of the terminal, DRX-related configuration information, and state change instruction information of the terminal. Contents included in the power saving signal correspond to those described above, so detailed descriptions are omitted.

According to an embodiment of the present disclosure, the state change instruction information of the terminal may be information instructing to switch the terminal from the active state to the inActive state or information instructing to switch from the inActive state to the active state, and the state transition time And information on the state transition period. Of course, it is not limited to the above example.

In operation 3260, a power saving signal may be detected.

According to an embodiment of the present disclosure, the terminal may monitor a predetermined search space in at least one of an active time and an inactive time, and detect a power saving signal based on the monitoring. As described above, the terminal may detect GTS at an active time and WUS at an inactive time.

Of course, it is not limited to the above example. For example, the terminal may detect uni-POSS at Active time and inActive time. That is, as described above, the terminal may detect the same type of power saving signal at an active time and an inactive time.

As another example, GTS may be detected at an active time and a power saving signal may not be detected at an inactive time, or a WUS may be detected at an inactive time and a power saving signal may not be detected at an active time. That is, the base station may configure the terminal to use only one of WUS or GTS.

In addition, according to an embodiment of the present disclosure, a format of downlink control information corresponding to the power saving signal detected at an active time of the terminal and downlink control information corresponding to the power saving signal detected at an inactive time of the terminal The format of may be different, which corresponds to the above description, and thus a detailed description thereof will be omitted.

In addition, according to an embodiment of the present disclosure, the downlink control information corresponding to the power saving signal detected at the active time of the terminal is scrambled with a Radio Network Temporary Identifier (RNTI) different from the downlink control information detected at the inActive time of the terminal. Can be. Of course, it is not limited to the above example.

In operation 3280, based on the power saving signal detected through monitoring, the monitoring configuration of the downlink control channel (PDCCH) of the terminal may be controlled.

According to an embodiment of the present disclosure, the terminal may change the monitoring period of the downlink control channel (PDCCH) of the terminal based on the power saving signal detected at the active time, or based on the power saving signal detected at the inActive time. Monitoring of the downlink control channel of the terminal may be stopped for a predetermined time from a predetermined point in time. A method for the UE to change the PDCCH monitoring configuration based on the power saving signal corresponds to that described above, and thus a detailed description thereof will be omitted.

The method of controlling the PDCCH monitoring configuration by the terminal shown in FIG. 32 is only one embodiment, and the terminal can perform the operations described in the first to fourth embodiments described above, and the first to fourth embodiments. All of the settings described in the example can be applied.

33 is a flowchart of an operation of a base station controlling a PDCCH monitoring configuration according to an embodiment of the present disclosure.

In operation 3320, setting information for a power saving signal may be transmitted. Since the setting information for the power saving signal corresponds to that described with reference to FIG. 32, detailed descriptions will be omitted.

In operation 3340, a power saving signal may be transmitted based on setting information on the power saving signal.

According to an embodiment of the present disclosure, the base station transmits the DCI corresponding to the power saving signal arranged to be the same size as the size of other downlink control information (DCI) monitored in the search space set in the terminal. can do. This corresponds to the above-described embodiments of the DCI size, and thus a detailed description thereof will be omitted.

In operation 3360, a control signal and data may be transmitted to the terminal based on the monitoring setting of the downlink control channel of the terminal set based on the power saving signal. That is, the base station may transmit the control signal and data to the terminal based on the PDCCH monitoring configuration changed by the terminal based on the power saving signal.

The method for the base station to control the PDCCH monitoring configuration of the terminal as shown in FIG. 33 is only one embodiment, and the base station can perform the operations described in the first to fourth embodiments described above, and the first to fourth embodiments. All the settings described in the 4 embodiment can be applied.

<Fifth embodiment>

In the following fifth embodiment, a method of allocating time domain resources for a data channel in a next-generation mobile communication system (5G or NR system) will be described.

The base station may set a table for time domain resource allocation information for PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel) to the UE as higher layer signaling (e.g., SIB, RRC signaling). For the PDSCH, a table consisting of maxNrofDL-Allocations = 16 entries can be set, and for the PUSCH, a table consisting of maxNrofUL-Allocations = 16 entries can be set. The time domain resource allocation information includes, for example, PDCCH-to-PDSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH (Physical Downlink Control CHannel) is transmitted, K0) or PDCCH-to-PUSCH slot timing (corresponds to the time interval in units of slots between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, expressed as K2), within the slot Information on the location and length of a start symbol in which the PDSCH or PUSCH is scheduled, and the mapping type of the PDSCH or PUSCH may be included. For example, information such as the following table may be notified from the base station to the terminal (see [Table 11] and [Table 12] described above).

According to an embodiment of the present disclosure, the base station may notify the terminal of one of the entries of the table for time domain resource allocation information to the terminal through L1 signaling (eg, DCI) (for example,'time in DCI It can be indicated by the'domain resource allocation' field). The terminal may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

If an entry with a K0/K2 value of 0 is indicated, this may mean that the PDCCH and the data channel are scheduled in the same slot. This is called “Self-Slot Scheduling”.

If an entry having a value of K0/K2 greater than 0 is indicated, this may mean that the PDCCH and the data channel are scheduled in different slots. This is called “Cross-Slot Scheduling”.

In a next-generation mobile communication system (5G or NR system), cross-slot scheduling may be used for the purpose of reducing power consumption of a terminal. When cross-slot scheduling is supported, the UE can operate in a sleep mode between a time when a PDCCH is received and a time when transmission and reception of a data channel occurs, thereby reducing power consumption. In addition, when cross-slot scheduling is supported by the terminal, the terminal can take a long processing time for the PDCCH, and accordingly, the power consumption can be reduced by increasing the computation speed. In addition, time domain scheduling information for the PDSCH can be finally obtained when decoding is completed after receiving the PDCCH. Therefore, during the time period in which the PDCCH is received and decoded, since the UE cannot know whether to schedule the PDSCH, it may be necessary to perform buffering of OFDM symbols that can be scheduled for the PDSCH, which consumes power of the UE. Can be greatly increased. If the terminal knows the time domain resource allocation information for the PDSCH before decoding the PDCCH, that is, it can know in advance that cross-slot scheduling is performed, and the terminal can minimize unnecessary PDSCH buffering, so power consumption Can be reduced.

In order to reduce the power consumption of the terminal, the base station may indicate to the terminal the minimum value of K0/K2 to be used in scheduling for the data channel through higher layer signaling or L1 signaling. The UE can expect that scheduling is always performed with a K0/K2 value corresponding to a value greater than or equal to the minimum value of K0/K2 received from the base station.

For convenience of explanation, the minimum value for K0/K2 indicated by the base station to the terminal is referred to as “minimum offset”.

The UE schedules the PDSCH or PUSCH from the base station (eg, DCI format 1_1 or DCI format 0_1) or non-scheduling DCI (eg, a new DCI format defined for power reduction purposes (eg, WUS or GTS ) Or DCI format 2_0 or DCI format 2_1, etc.), the minimum offset value may be indicated.

The terminal receives the minimum offset value for K0 (K0 _min ) and the minimum offset value for K2 (K2 _min ) separately from the base station as different values, or the minimum offset values for K0 and K2 (K _min ). Can receive one value. In the present disclosure, a case where one minimum offset value, K _min is indicated, is described, but the contents of the present disclosure may be equally applied even when K0 _min and K2 _min are indicated separately.

The terminal may receive the minimum offset value through DCI transmitted from the base station at a specific time point, and the contents of the received minimum offset value can be applied from a time point after the specific time point. For example, the UE can receive the DCI from the base station through the PDCCH transmitted in slot n to receive the minimum offset value, and apply the obtained minimum offset value from the time slot n+k (k≥0). have. Here, k (this is referred to as “application delay time”) is a predefined fixed value, or a value set by the base station to the terminal, or the minimum K0 (or K2) value in the set time domain resource allocation table, or the terminal It may be a value assumed at a time point before slot n (ie, a minimum offset value received at a time point before slot n).

In an embodiment of the present disclosure, when the minimum offset value received in slot n is applied in slot m, the slot m (=slot n+k) to which the minimum offset value is applied may be defined as a function of various system parameters. For example, m may be defined as follows. Of course, it is not limited to the following examples.

[Equation 11]

Alternatively, the time point at which the minimum offset value is applied may be expressed as an offset k, and k=m-n, or k may be defined as follows.

[Equation 12]

k may be expressed later as K _app .

The above-described application delay time is defined as separate parameters for the minimum offset value for K0 (K0 _min ) and the minimum offset value for K2 (K2 _min ), or is based on one minimum offset value for K0 and K2 (K _min ). Can be defined as one parameter. For example, in Equation 11 or Equation 12, the Y value may correspond to K0 _min or K2 _min , and accordingly, the application delay time K _app,0 may be defined for K0, and the application delay time K for K2 _app,2 can be defined respectively. Alternatively, in Equation 11 or 12, the Y value may correspond to one minimum offset value K _min for K0 and K2, and accordingly, one application delay time K _app for K0 and K2 may be defined. In the present disclosure, it is assumed that one K _app is assumed, but even when K _app is defined for K0 and K2, the contents of the present disclosure may be equally applied.

In addition, the meaning of applying the received minimum offset value can be understood as differently applying the interpretation of the time domain resource allocation table based on the received minimum offset value. The contents will be described in the following <Example 5-1>.

Also, for convenience of description, the following time domain resource allocation table for the PDSCH is used as an example.

<Example 5-1>

In the following, a method of interpreting a time domain resource allocation table is proposed when the terminal receives a minimum offset value from the base station. A method corresponding to at least one or a combination of one or more of the following methods may be applied.

[Method 1]

According to an embodiment of the present disclosure, based on the minimum offset received from the base station, the terminal expects scheduling to be performed only with entries in which the K0/K2 value is greater than or equal to the minimum offset among preset time domain resource allocation table values. I can. For example, if the time domain resource allocation table of [Table 19] is set in the terminal, and the minimum offset value is indicated as 3, the terminal has entries whose K0 value is less than 3, that is, entry indexes 1, 2, 3, 4, 5, 6 can be expected not to be scheduled, except for the remaining entries, that is, entry index 7, 8, ... , Can only be expected to be scheduled with 16.

[Method 2]

According to an embodiment of the present disclosure, based on the minimum offset received from the base station, the terminal changes values in which the K0/K2 value is less than the minimum offset among preset time domain resource allocation table values to the received minimum offset value. I can. For example, if the time domain resource allocation table of [Table 19] is set in the terminal, and the minimum offset value is indicated as 3, the terminal has entries whose K0 value is less than 3, that is, entry indexes 1, 2, 3, 4, For 5 and 6, K0 can be assumed to be 3. Excluding this, the remaining entries, that is, entry index 7, 8, ... And 16 can be used as it is without changing the K0 value.

[Method 3]

According to an embodiment of the present disclosure, based on the minimum offset received from the base station, the terminal determines the minimum offset value received for values whose K0/K2 values are smaller than the minimum offset among preset time domain resource allocation table values. In addition, you can change it. That is, the terminal may assume that the preset K0 or K2 value is updated to K0+minimum offset or K2+minimum offset. For example, if the time domain resource allocation table of [Table 19] is set in the terminal, and the minimum offset value is indicated as 3, the terminal has entries whose K0 value is less than 3, that is, entry indexes 1, 2, 3, 4, It can be updated by adding the minimum offset value 3 to the K0 value set for 5 and 6. For example, the table in [Table 19] can be changed as follows.

[Method 4]

According to an embodiment of the present disclosure, the terminal may change by adding the received minimum offset value to all K0/K2 values in a preset time domain resource allocation table based on the minimum offset received from the base station. That is, the UE may assume that all preset K0 or K2 values are updated to K0+minimum offset or K2+minimum offset. For example, if the time domain resource allocation table of [Table 19] is set in the terminal and the minimum offset value is indicated as 3, the terminal may update all K0 values by adding the indicated minimum offset value 3. That is, it can be changed as follows.

Through the above-described method, the terminal expects to be scheduled with only some entries of the preset time domain resource allocation table based on the received minimum offset value, or schedules based on the updated time domain resource allocation table in consideration of the minimum offset value. You can expect to be.

[Method 5]

According to an embodiment of the present disclosure, based on the minimum offset received from the base station, the terminal expects scheduling to be performed only with entries in which the K0/K2 value is greater than or equal to the minimum offset among preset time domain resource allocation table values. I can. For example, if the time domain resource allocation table of [Table 19] is set in the terminal, and the minimum offset value is indicated as 3, the terminal has entries whose K0 value is less than 3, that is, entry indexes 1, 2, 3, 4, 5, 6 can be expected not to be scheduled, except for the remaining entries, that is, entry index 7, 8, ... , Can only be expected to be scheduled with 16. For convenience of description, the following terms will be defined.

-Valid entry: An entry whose K0/K2 value is greater than or equal to the received minimum offset among the preset time domain resource allocation table values and can be used for scheduling.

-Invalid entry: An entry whose K0/K2 value is greater than or equal to the received minimum offset among preset time domain resource allocation table values and cannot be used for scheduling.

In performing the above-described method, if the minimum offset value received by the terminal from the base station is greater than all K0/K2 values in the set time domain resource allocation table (or the same minimum offset value received by the terminal from the base station) This may correspond to a case that is greater than the maximum value of K0/K2 in the set time domain resource allocation table), and any entry in the time domain resource allocation table set in the terminal may not correspond to a valid entry. Therefore, additional terminal operations need to be defined.

In addition, according to an embodiment of the present disclosure, if the terminal is greater than all K0 (or K2) values in the time domain resource allocation table in which the minimum offset value indicated by the base station is set, the terminal is in the configured time domain resource allocation table. It can be assumed that all K0 (or K2) values are received minimum offset values.

In addition, according to an embodiment of the present disclosure, if the terminal is greater than all K0 (or K2) values in the time domain resource allocation table in which the minimum offset value indicated by the base station is set, the terminal uses the indicated content as an error. I can judge. That is, the terminal may not expect to be indicated by a value greater than all K0 (or K2) values in the time domain resource allocation table in which the minimum offset value is set from the base station.

<Example 5-1-1>

According to an embodiment of the present disclosure, the terminal may receive a time domain resource allocation table for each configured bandwidth part. For example, if two bandwidth parts, bandwidth part #1, and bandwidth part #2 are set in the terminal, time domain resource allocation table #1 and time domain resource allocation table #2 are set as configuration information in each bandwidth part. It can be set for each terminal. The terminal may use the time domain resource allocation table corresponding to the bandwidth part index indicated by the bandwidth part indicator in the DCI. For example, if the bandwidth part indicator in the DCI indicates the bandwidth part #N, the terminal assumes the time domain resource allocation table #N set as the setting information of the bandwidth part #N when interpreting the time domain resource allocation table field in the DCI. Can be interpreted.

The terminal can receive the minimum offset value from the base station through the DCI transmitted in the currently active bandwidth part, and based on the received minimum offset value, valid or non-effective for the time domain resource allocation table set in each bandwidth part. Valid entries can be determined.

According to an embodiment of the present disclosure, the terminal may equally apply the minimum offset value received from the base station to the time domain resource allocation table of each bandwidth part. More specifically, the terminal may receive the minimum offset value from the base station through the PDCCH transmitted in the currently active bandwidth part, and the terminal received in all time domain resource allocation tables #N of all configured bandwidth parts #N. It can be analyzed by applying the minimum offset value. (For example, for the time domain resource allocation table #N of the bandwidth part #N, a valid entry may be determined based on the received minimum offset value.)

In this case, according to the time domain resource allocation table setting information of each bandwidth part and the indicated minimum offset value, a valid entry in the time domain resource allocation table of a specific bandwidth part may not exist. Therefore, additional terminal operations need to be defined.

[Method 1]

According to an embodiment of the present disclosure, after applying the received minimum offset value to time domain resource allocation tables of all configured bandwidth parts, the terminal may not expect that no valid entry exists. That is, the terminal may not expect that the minimum offset value indicated by the base station is indicated as a value greater than all K0 (or K2) values in the time domain resource allocation tables of all bandwidth parts in which the set. If the minimum offset value received by the terminal from the base station is greater than all K0 (or K2) values in the time domain resource allocation table of at least one configured bandwidth part, the terminal may determine the indicated content as an error. . Alternatively, it may be set to the largest value or a preset specific value among all K0 (or K2) in the time domain resource allocation table of at least one set bandwidth part.

[Method 2]

According to an embodiment of the present disclosure, after applying the received minimum offset value to the time domain resource allocation table of the currently active bandwidth part, the terminal may not expect that there is no valid entry. That is, the terminal may not expect that the minimum offset value indicated by the base station is indicated as a value greater than all K0 (or K2) values in the time domain resource allocation tables of the currently active bandwidth part. If the minimum offset value received by the terminal from the base station is greater than all K0 (or K2) values in the time domain resource allocation table of the currently active bandwidth part, the terminal may determine the indicated content as an error.

After applying the received minimum offset value to the time domain resource allocation table of a specific bandwidth part that is not currently active, a valid entry may not exist. If the terminal does not have a valid entry in the time domain resource allocation table of the corresponding bandwidth part after applying the minimum offset value received from the base station, the terminal does not expect to receive a DCI indicating a bandwidth part change to the corresponding bandwidth part. May not. That is, when the minimum offset value indicated by the base station is greater than all K0 (or K2) values in the time domain resource allocation tables of a specific bandwidth part that is not currently active, the terminal DCI instructing to change the bandwidth part to the corresponding bandwidth part. You may not expect to receive If the terminal receives a DCI indicating change to the corresponding bandwidth part, the terminal may determine the DCI as an error.

[Method 3]

According to an embodiment of the present disclosure, after applying the received minimum offset value to the time domain resource allocation table of the currently active bandwidth part, the terminal may not expect that there is no valid entry. That is, the terminal may not expect that the minimum offset value indicated by the base station is indicated as a value greater than all K0 (or K2) values in the time domain resource allocation tables of the currently active bandwidth part. If the minimum offset value received by the terminal from the base station is greater than all K0 (or K2) values in the time domain resource allocation table of the currently active bandwidth part, the terminal may determine the indicated content as an error. The currently active bandwidth part may be a predetermined time point. For example, it may be when the minimum offset is applied to the resource allocation table, when the resource allocation table is set, when scheduling information is received, and the like, and is not limited to the above example.

After applying the received minimum offset value to the time domain resource allocation table of a specific bandwidth part that is not currently active, the terminal may determine that there is no valid entry. If the terminal applies the minimum offset value received from the base station and then determines that there is no valid entry in the time domain resource allocation table of the corresponding bandwidth part, the terminal uses all K0 (or K2) in the time domain resource allocation table of the corresponding bandwidth part. ) Can be assumed (or determined) as the received minimum offset value. That is, if the minimum offset value indicated by the base station is greater than all K0 (or K2) values in the time domain resource allocation tables of a specific bandwidth part that is not currently active, the terminal It can be assumed that the K0 (or K2) value is the received minimum offset value.

<Example 5-1-2>

When more than one bandwidth part is configured for the terminal, the base station may instruct the terminal to change the bandwidth part by using a bandwidth part indicator field in the DCI. As an example, if the currently active bandwidth part of the terminal in FIG. 3 is bandwidth part #1 301, the base station may instruct the terminal with bandwidth part #2 302 as a bandwidth part indicator in the DCI, and the terminal receives The bandwidth part can be changed to the bandwidth part #2 302 indicated by the bandwidth part indicator in the DCI.

As described above, since the DCI-based bandwidth part change can be indicated by the DCI scheduling the PDSCH or PUSCH, when the UE receives the bandwidth part change request, the PDSCH or PUSCH scheduled by the corresponding DCI is unreasonable in the changed bandwidth part. It should be able to perform reception or transmission without it. To this end, the standard stipulates a requirement for a delay time (T _BWP ) required when changing a bandwidth part, and can be defined as follows, for example.

The requirement for the bandwidth part change delay time may support type 1 or type 2 according to the capability of the terminal. The terminal may report a bandwidth part delay time type that can be supported to the base station.

According to the above-described requirements for the bandwidth part change delay time, when the terminal receives the DCI including the bandwidth part change indicator in slot n, the terminal changes to the new bandwidth part indicated by the bandwidth part change indicator in slot n+ It can be completed at a time not later than the T _BWP , and transmission/reception for the data channel scheduled by the corresponding DCI can be performed in the changed new bandwidth part. When scheduling a data channel with a new bandwidth part, the base station may determine the time domain resource allocation for the data channel in consideration of the bandwidth part change delay time (T _BWP ) of the terminal. That is, in a method of determining time domain resource allocation for a data channel when scheduling a data channel with a new bandwidth part, the base station may schedule the corresponding data channel after the bandwidth part change delay time. Accordingly, the UE may not expect that the DCI indicating the bandwidth part change indicates a slot offset (K0 or K2) value smaller than the bandwidth part change delay time (T _BWP ).

If the terminal receives a DCI indicating a bandwidth part change (for example, DCI format 1_1 or 0_1), the terminal starts from the third symbol of the slot in which the PDCCH including the DCI is received, the time domain resource allocation indicator field in the DCI No transmission or reception may be performed during a time period corresponding to the start point of the slot indicated by the slot offset (K0 or K2) indicated by. For example, if the terminal receives a DCI indicating a bandwidth part change in slot n, and the slot offset value indicated by the corresponding DCI is K, the terminal starts from the third symbol of slot n to the previous symbol of slot n+K (i.e., slot The last symbol of n+K-1) may not perform any transmission or reception.

If the terminal receives the minimum offset value from the base station, the terminal can reduce power consumption by lowering the processing operation speed for the PDCCH in consideration of the received minimum offset value. Accordingly, the time of decoding the PDCCH of the UE may be delayed, and the time of determining whether the transmitted DCI has instructed to change the bandwidth part may be relatively delayed compared to the case where self-slot scheduling is assumed. Therefore, when the terminal receives information on the minimum offset value from the base station, in order to more effectively support the reduction of power consumption of the terminal, it is necessary to further extend the period in which the terminal does not expect transmission/reception considering the bandwidth part change. For example, at least one or a combination of one or more of the following methods may be applied.

[Method 1]

According to an embodiment of the present disclosure, if the minimum offset value assumed by the terminal in slot n is K _min , a DCI indicating a bandwidth part change is received in slot n, and a slot offset value indicated by the corresponding DCI is K If the called terminal can not do anything to transmit or receive (or the last symbol of the slot _{n + K min + K-1} ) from the third symbol of the slot, slots n + K n _min + K starting point.

[Method 2]

According to an embodiment of the present disclosure, if the minimum offset value assumed by the terminal in slot n is K _min , a DCI indicating a bandwidth part change is received in slot n, and a slot offset value indicated by the corresponding DCI is K If the called terminal is not perform any transmit or receive up to a starting point from the third symbol of the slot, slots n _{n + min (K min, K} ) ( or slot _{n + min (K min, K} ) the last symbol of -1) Here, min(A,B) may correspond to a function that outputs the smaller value of A and B.

[Method 3]

Prior to the description of Method 3, the following parameters are defined. The parameters defined below may be utilized throughout the present disclosure.

-T _BWP : Delay time required when changing the bandwidth part

-K _min : The minimum offset value assumed by the terminal in slot n according to the minimum offset value set or indicated by the base station

- K: A slot offset value for a PDSCH or PUSCH received through a DCI (for example, DCI format 1_1 or DCI format 0_1) indicating a bandwidth part change in slot n

-K _app : Delay time for when the terminal applies the contents of the minimum offset value received by DCI (corresponds to the previously defined “application delay time”). Can be defined in units of slots. It may be defined as a different value according to the subcarrier spacing of the PDCCH and the capability of the terminal.

- N0: The number of symbols corresponding to the PDCCH processing time of the terminal. It may be defined as a different value according to the subcarrier spacing of the PDCCH and the capability of the terminal.

- N0': The number of symbols corresponding to a longer PDCCH processing time compared to N0 of the terminal, and may correspond to a processing time used when the terminal receives or assumes a minimum offset value. It may be defined as a different value according to the subcarrier spacing of the PDCCH and the capability of the terminal.

- N1: Number of symbols corresponding to PDSCH processing time of the terminal. It may be defined as a different value according to the subcarrier spacing of the PDCCH and the capability of the terminal.

- N2: Number of symbols corresponding to the PUSCH processing time of the terminal. It may be defined as a different value according to the subcarrier spacing of the PDCCH and the capability of the terminal.

The number of symbols (N0, N0', N1, or N2) corresponding to the processing time for the control channel or the data channel of the terminal may be differently defined according to the capability of the terminal and the subcarrier interval (μ).

For example, the number of symbols for processing time for the PDSCH may be defined as follows.

Also, based on the aforementioned N1 value, the processing time for the PDSCH may be derived as follows.

[Equation 13]

Each parameter of Equation 13 may be defined as follows.

Also, according to an embodiment, the number of symbols for processing time for PUSCH may be defined as follows.

Also, based on the aforementioned N2 value, the processing time for the PUSCH may be derived as follows.

[Equation 14]

Each parameter of Equation 14 may be defined as follows.

According to an embodiment of the present disclosure, the terminal may determine a time period during which transmission or reception is not performed according to a bandwidth part change in consideration of a minimum offset value or an application delay time for the minimum offset value. If the terminal receives a DCI indicating a bandwidth part change (for example, DCI format 1_1 or 0_1), the terminal starts from the third symbol of the slot in which the PDCCH containing the DCI is received, the minimum offset value assumed by the terminal or No transmission or reception may be performed during a time period corresponding to the starting point of the slot considering the application delay time for the minimum offset value and the bandwidth part change delay time T _BWP . Of course, it is not limited to the above example, and the terminal may be configured to transmit or receive some control signals if necessary.

More specifically, if the terminal assumes a minimum offset value in slot n is K _min, and receives a DCI (for example, DCI format 1_1 or DCI format 0_1) indicating a bandwidth part change in slot n, When the slot offset value indicated by DCI is K, the terminal starts at the start point of slot n+K' (or the last symbol of slot n+K'-1) from the third symbol of slot n on which the PDCCH including the corresponding DCI is received. May not perform any transmission or reception until. Here, n may be defined as at least one or a combination of one or more of the following values.

-K'= T _BWP + K _min

-K'= max(T _BWP + K _min ,K)

-K'= T _BWP + K _app

-K'= max(T _BWP + K _app ,K)

In addition, according to an embodiment of the present disclosure, the terminal may determine a time period during which transmission or reception is not performed according to a bandwidth part change in consideration of processing time for a control channel or a data channel. If the terminal receives a DCI indicating a bandwidth part change (for example, DCI format 1_1 or 0_1), the terminal processes the control channel or data channel from the third symbol of the slot in which the PDCCH including the corresponding DCI is received. No transmission or reception may be performed during a time period corresponding to the start point of the slot considering the over-bandwidth part change delay time T _BWP .

More specifically, if the terminal assumes the minimum offset value in slot n is K _min , and in slot n, a DCI indicating a bandwidth part change (for example, DCI format 1_1 or DCI format 0_1) is received, and the corresponding If the slot offset value indicated by DCI is K, the terminal starts at the start point of slot n+K' (or the last symbol of slot n+K'-1) from the third symbol of slot n receiving the PDCCH including the DCI. May not perform any transmission or reception until. Here, K'may be defined as at least one or a combination of one or more of the following values.

-K'= T _BWP +K _delay

-K'= max(T _BWP +K _delay ,K)

-K'= K _delay + K

Here, K _delay may be expressed as a function of N _delay (that is, K _delay = f(N _delay )), and N _delay may correspond to at least one of N0, N0', and N2. y=f(x) may correspond to a function that changes the symbol unit parameter x into a slot unit parameter y. For example, it may be defined as K _delay = f(N _delay ) = ceil(N _delay /N _sym ). Here, N _delay may correspond to a parameter in a symbol unit or a parameter reconverted in a time unit (T _proc ). For example, the parameter T _proc,2 re-converted to the time unit of N2 may be given by Equation 14.

Through the above-described method, the UE can operate to have a sufficiently long time required for PDCCH processing, thereby reducing power consumption.

<Example 5-1-3>

The symbols in the slot may be composed of a downlink (DL) symbol, an uplink (UL) symbol, or a combination of flexible (F) symbols. For example, one slot may consist of M DL symbols, N F symbols, and L UL symbols, and a total of N _sym =M+N+L (where N _sym may be defined as the number of symbols in one slot. .) can be satisfied. As described above, the format of symbols in one slot and the pattern of formats are referred to as "slot format". That is, a pattern consisting of a specific DL symbol, F symbol, and UL symbol in one slot is defined as a “slot format”.

The UE may receive information on a slot format (ie, information on a combination of a DL symbol, an F symbol, and a UL symbol constituting a specific slot) through higher layer signaling (eg, SIB, RRC signaling) or DCI. . For example, the UE may receive slot format information for a specific slot through higher layer parameters TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigurationDedicated. For example, the terminal may obtain a slot format indicator through DCI (eg, DCI format 2_0), and may obtain information on a slot format of a specific slot from the slot format indicator.

The UE may not expect DCI to indicate UL symbols or F symbols for symbols set as DL symbols by higher layer signaling. The UE may not expect DCI to indicate a DL symbol or an F symbol for symbols set as UL symbols by higher layer signaling. The UE may obtain information indicated by the DCI as a DL symbol, a UL symbol, or an F symbol for symbols set as F symbols by higher layer signaling.

If the UE is configured to perform downlink reception (e.g., CSI-RS (Channel State Information Reference Signal) or PDSCH (Physical Downlink Shared CHannel)) with higher layer signaling for certain symbols, among the symbols For at least one symbol, if the slot format indicator received through DCI is indicated by UL symbol or F symbol or uplink transmission (PUSCH, PUCCH, SRS or PRACH, etc.) is indicated by DCI, the UE corresponds to The reception operation for the CSI-RS or PDSCH in the slot can be canceled.

If the UE is configured to perform uplink transmission (e.g., Sounding Reference Signal (SRS), Physical Uplink Control CHannel (PUCCH)), PUSCH, or Physical Random Access CHannel (PRACH)) with higher layer signaling for certain symbols, For at least one of the symbols, if the slot format indicator received through DCI is indicated as a DL symbol or an F symbol, or downlink reception (CSI-RS or PDSCH reception) is indicated by DCI,

-The UE does not expect to cancel uplink transmission in symbols during a time period from the last symbol of the control region in which DCI is detected to the PUSCH processing time (T _proc,2 ).

-The UE can cancel uplink transmission in symbols after the PUSCH processing time (T _proc,2 ).

As described above, the UE performs uplink transmission for symbols after PUSCH processing time when a slot format indicator received by DCI or downlink reception is instructed by DCI for symbols configured for uplink transmission. Can be canceled. In this case, the UE can still perform corresponding uplink transmission on symbols before the PUSCH processing time, which takes into account the decoding time for the PDCCH. That is, since the UE can determine whether or not the symbols set for uplink transmission are indicated as F symbols or DL symbols through DCI, after the time when decoding for the corresponding PDCCH is completed, the preset uplink transmission In order to cancel transmission, a certain margin of time may be required (in the above, this is assumed to be a PUSCH processing time).

When the terminal receives the minimum offset value from the base station, the terminal can see the effect of reducing power consumption by extending the processing time for the PDCCH. Accordingly, the processing time for the DCI including the slot format indicator may also be extended, and the time taken for the UE to determine whether to cancel the uplink transmission previously set may be increased. Therefore, when the terminal receives the minimum offset value from the base station, a different operation may be required.

According to some embodiments of the present disclosure, if the terminal receives the minimum offset value from the base station (DCI or higher layer signaling or a value based on a predetermined default value), if the terminal is uplinked to higher layer signaling for certain symbols It is configured to perform link transmission (eg, SRS, PUCCH, PUSCH, or PRACH), and for at least one symbol among the corresponding symbols, the slot format indicator received through DCI is indicated as a DL symbol or an F symbol, or If downlink reception (CSI-RS or PDSCH reception) is instructed by DCI,

- The UE does not expect to cancel uplink transmission in symbols during a time period from after the last symbol of the control region in which DCI is detected to a specific time (T).

- The terminal may cancel uplink transmission in symbols after a specific time (T).

In the above, the specific time T may correspond to at least one of K _min, K _app , N0, N0', and N2. Of course, the values of K _min, K _app , N0, N0', and N2 may be used as they are, or may be re-converted to another unit and applied, and may be converted into other parameters and used.

For example, since K _{min and} K _app may correspond to parameters having a slot unit, they may be re-converted to parameters having a time unit. For example, it can be expressed as T = f(K _min ) or T = f(K _app ), where f(·) is a function that receives a parameter having a slot unit and outputs it as a parameter value having a time unit. May be applicable. For example, it may be defined as f(x) = x · T _sf · 2 ^-μ , where T _sf =1ms, μ may be defined as a parameter corresponding to the subcarrier spacing for the PDCCH.

As another example, since N0, N0', and N2 may correspond to parameters having a symbol unit, they may be re-converted to parameters having a time unit. For example, it can be expressed as T = g(N0) or T = g(N0') or T = g(N2), where g(·) is a parameter having a time unit by receiving a parameter having a symbol unit. It can correspond to a function that prints by value. For example, in the case of N2, it may be defined as a function as shown in Equation 14, and N0 or N0' may also be defined as a similar function.

According to some embodiments of the present disclosure, when a terminal receives a minimum offset value from a base station (a value based on DCI or higher layer signaling or a predetermined default value), the terminal is in a DCI format corresponding to the slot format indicator (for example, For example, for PDCCH monitoring for DCI format 2_0), extension of the PDCCH processing time may not be performed as an exception.

<Example 5-1-4>

The base station provides time and frequency for PDSCH and PUSCH for the purpose of supporting non-approval-based transmission and reception for a downlink data channel (Physical Downlink Shared Channel; PDSCH) or an uplink data channel (PUSCH) to the terminal. Transmission resources and various transmission/reception parameters can be set as semi-static.

More specifically, for the purpose of supporting a downlink (DL) Semi-Persistent Scheduling (SPS) to a terminal, the base station may set the following information by higher layer signaling (e.g., RRC signaling).

The DL SPS may be configured in a primary cell or a secondary cell, and a DL SPS may be configured in one cell within one cell group.

In 5G, two types of non-approval-based transmission methods for uplink (UL), non-approval-based UL transmission type-1 (which may be referred to as UL grant Type 1), and non-approval-based UL transmission It can support Type-2 (which may be named UL grant Type 2).

According to an embodiment, in the non-approval-based UL transmission type-1, the base station provides information and period information on the time and frequency resources for allowing transmission of the non-approval-based PUSCH to the terminal, and the terminal receives from the base station when necessary The non-approval-based PUSCH can be transmitted based on the obtained information, and in the non-approval-based UL transmission type-2, the base station transmits some of the information on the time and frequency resources to allow transmission of the non-approval-based PUSCH and period information After providing to, the base station activates non-approval-based PUSCH transmission to the terminal through DCI, and provides some of the remaining information (some of information and period information on the time and frequency resources allowing transmission of the PUSCH). I can. Of course, it is not limited to the above example.

For the purpose of supporting UL grant Type 2 for uplink to the UE, the base station may set the following information by higher layer signaling (eg, RRC signaling).

The base station may transmit a DCI configured with a specific DCI field value for the purpose of scheduling activation or scheduling release for DL SPS and UL grant Type 2 to the terminal.

More specifically, the base station may configure a CS-RNTI (Configured Scheduling-RNTI) to the UE, and the UE may monitor the DCI format in which CRC is scrambled with CS-RNTI. When the CRC of the DCI format received by the terminal is scrambled with CS-RNTI, a new data indicator (NDI) is set to '0', and the DCI field satisfies the table below, the terminal determines the DCI. It may be regarded as a command for activating transmission/reception for DL SPS or UL grant Type 2.

The base station can configure a CS-RNTI (Configured Scheduling-RNTI) to the terminal, and the terminal can monitor the DCI format in which CRC is scrambled with CS-RNTI. When the CRC of the DCI format received by the terminal is scrambled with CS-RNTI, a new data indicator (NDI) is set to '0', and the DCI field satisfies the table below, the terminal determines the DCI. It may be regarded as a command for releasing transmission and reception for DL SPS or UL grant Type 2.

When the terminal receives the DCI corresponding to the DL SPS release from the base station, the terminal can transmit HARQ-ACK information in response to the DL SPS release from the last symbol of the PDCCH corresponding to the DL SPS release to the base station after N symbols. . N may be different according to the UE's capability and the subcarrier spacing (μ) of the PDCCH. For example, for terminal processing performance 1 (which may correspond to a relatively long processing time capacity), N=10 at μ=0 (15 kHz), N=12 at μ=1 (30 kHz), μ= It can be defined as N=22 at 2 (60kHz) and N=25 at μ=3 (120kHz), and for terminal processing performance 2 (which may correspond to a relatively short processing time capacity), μ=0 It can be defined as N=5 at (15kHz), N=5.5 at μ=1 (30kHz), and N=11 at μ=2 (60kHz).

As described above, when the UE receives the DCI corresponding to the DL SPS release, the UE may transmit the HARQ-ACK in response to the PDCCH after N symbols, which takes into account the decoding time for the PDCCH. That is, the UE can determine whether or not to obtain DCI for DL SPS release through the PDCCH, after the time when decoding for the PDCCH is completed, and accordingly, the UE can determine the DCI after a specific time (N symbols in the above situation). HARQ-ACK for can be transmitted.

When the terminal receives the minimum offset value from the base station, the terminal can see the effect of reducing power consumption by extending the processing time for the PDCCH. Accordingly, the processing time for the DCI including the DL SPS release may also be extended, and the time required for transmitting the HARQ-ACK for the DCI received by the UE may be longer. Therefore, when the terminal receives the minimum offset value from the base station, a different operation may be required.

According to an embodiment of the present disclosure, if the terminal receives the minimum offset value from the base station (DCI or higher layer signaling or a value based on a predetermined default value), the terminal receives the DCI corresponding to the DL SPS release from the base station. When received, the UE may transmit HARQ-ACK information to the base station after N symbols from the last symbol of the PDCCH corresponding to the DL SPS release in response thereto. N may correspond to at least one of K _min, K _app , N0, N0', and N2. The values of K _min, K _app , N0, N0', and N2 may be used as they are, or may be re-converted into other units and applied, and may be converted into other parameters and used.

For example, since K _{min and} K _app may correspond to parameters having a slot unit, they may be re-converted into parameters having a symbol unit. For example, it can be expressed as N = f(K _min ) or N = f(K _app ), where f(·) is a function that receives a parameter having a slot unit and outputs it as a parameter value having a symbol unit. May be applicable. For example, f(x) = x · N _sym may be defined, where N _sym may be defined as the number of symbols per slot.

According to an embodiment of the present disclosure, when a terminal receives a minimum offset value (a value based on DCI or higher layer signaling or a predetermined default value) from a base station, the terminal is in a DCI format corresponding to the DL SPS release (for example, For example, for PDCCH monitoring for DCI format 1_0), extension of the PDCCH processing time may not be performed as an exception.

<Example 5-2>

When the terminal receives a value for the minimum offset from the base station, in some cases, scheduling based on the minimum offset value may not be considered. In other words, even if the minimum offset value is indicated, the terminal can expect to be scheduled based on a preset time domain table.

For example, in the following cases, the minimum offset value may not be applied when monitoring.

-When DCI format 1_0 scrambled with SI-RNTI is monitored in a type-0 common search space

-When DCI format 1_0 scrambled with SI-RNTI is monitored in a type-0 common search space

-When DCI format 1_0 scrambled with RA-RNTI and TC-RNTI is monitored in the type-0 common search space

-When DCI format 1_0 scrambled with P-RNTI is monitored in a type-0 common search space (in the case of PUSCH scheduled as RAR (Random Access Response), the terminal preamble, PRACH (Physical Random Access)) in the random access process Cahnnel)) may be transmitted, and then the RAR for the transmitted preamble may be received, in this case, the UE may receive a PDSCH corresponding to the RAR in DCI format 1_0 scrambled with RA-RNTI in the common search space. The RAR message may include UL grant information for the PUSCH for transmitting message 3. The UL grant for scheduling the PUSCH transmitted through the RAR may include time domain resource allocation information, in this case, the terminal The above-described minimum offset value may not be applied.)

-When the DCI format 1_0 scrambled with C-RNTI or MCS-C-RNTI or CS-RNTI is monitored in searchSpaceZero, searchSpaceSIB1, searchSpaceOtherSystemInformation, pagingSearchSpace, ra-SearchSpace #0 (searchSpaceZero), a search space for receiving SIB1 (searchSpaceSIB1), a search space for receiving other system information (searchSpaceOtherSystemInformation), a search space for receiving paging (pagingSearchSpace), a search space for receiving RAR (ra -SearchSpace) More specific search space setting information that can be notified through PDCCH-ConfigCommon is summarized in Tables 22 and 23. If the terminal is one or one of the aforementioned search spaces from the base station If the above is set and at least one of C-RNTI, MCS-C-RNTI, or CS-RNTI is set, the terminal is a DCI format 1_0 scrambled with C-RNTI or MCS-C-RNTI or CS-RNTI or DCI format 0_0 can be monitored together when monitoring the PDCCH candidate group for DCI format 0_0 or 1_0 scrambled with SI-RNTI, RA-RNTI or P-RNTI in the set search spaces, in this case, the UE can monitor the aforementioned minimum offset value. May not be applied.)

<Sixth Example>

According to an embodiment of the present disclosure, the base station may set the control region to the terminal, and may set the transmission configuration indicator (TCI) state for the control region. Based on the TCI state set in the control region, the UE can determine which RS (e.g., SS/PBCH block or CSI-RS) has a Quasi co-Located (QCL) relationship with the DMRS transmitted in the control region. have. For example, the following information may be provided as a TCI state setting for the control region.

The base station may set one or a plurality of TCI states for a specific control region to the terminal, and may activate one of the configured TCI states through a MAC CE activation command. For example, {TCI state#0, TCI state#1, TCI state#2} is set as TCI state in control area #1, and the base station is TCI state as TCI state for control area #1 through MAC CE. A command for activating to assume #0 can be transmitted to the terminal. The UE may correctly receive the DMRS of the corresponding control region based on the QCL information in the activated TCI state based on the activation command for the TCI state received by the MAC CE.

For the control region (control region #0) whose index is set to 0, if the terminal does not receive the MAC CE activation command for the TCI state of control region #0, the terminal responds to the DMRS transmitted from the control region #0. It may be assumed that the SS/PBCH block and QCL identified in the initial access process or the non-contention-based random access process that are not triggered by the PDCCH command have been identified.

For a control region (control region #X) whose index is set to a value other than 0, if the terminal has not set the TCI state for the control region #X, or if more than one TCI state has been set, one of them is activated. If the MAC CE activation command is not received, the UE may assume that the DMRS transmitted in the control region #X is QCL with the SS/PBCH block identified in the initial access process.

In order to increase the reception performance for the PDCCH, the base station may perform repetitive transmission of the PDCCH to the terminal. In this case, additionally, different beams may be applied to each PDCCH transmission and transmitted. Here, the use of different beams may be regarded as applying different TCI states to each PDCCH transmission or assuming different QCLs (especially, which may correspond to QCL type D) in the UE and receiving them. The terminal may receive the PDCCH repeatedly transmitted by the base station assuming different QCLs, and accordingly, the reception performance of the PDCCH of the terminal may be improved.

The above-described repetitive transmission for the PDCCH and transmission in different beams may be applied to transmission in WUS or GTS. This is because WUS and GTS require high reliability. In particular, in the case of WUS, it can be monitored at the DRX inactive time, and can be monitored at very long intervals according to the DRX configuration. In this case, there is a problem that reception performance may be poor because precoding used for WUS transmission or a channel estimate for determining a beam may not be accurate. To solve this problem, the above-described repetitive transmission of the PDCCH and a transmission method using multiple beams may be considered.

The sixth embodiment of the present disclosure proposes various embodiments of a method of repeatedly transmitting a PDCCH and transmitting using different beams. The following embodiment can be applied to the aforementioned WUS or GTS transmission.

<Example 6-1>

In Embodiment 6-1 of the present disclosure, a method of performing repetitive transmission on a PDCCH is proposed.

According to an embodiment of the present disclosure, the terminal may receive configuration information on the number of repetitive transmissions for the PDCCH from the base station. For example, the base station may notify the UE of configuration information that the PDCCH will be repeated N times through higher layer signaling (eg, RRC signaling). In this case, the base station may additionally set information on a first PDCCH monitoring occasion among PDCCHs repeated N times. The UE may perform monitoring and reception for the PDCCH assuming that PDCCH N is repeated from the set first PDCCH monitoring occasion.

According to an embodiment of the present disclosure, the terminal may implicitly determine the number of repetitive transmissions for the PDCCH. For example, the base station may set the duration among parameters for the search space to the terminal, and the terminal may assume that the PDCCHs transmitted in the PDCCH monitoring occasion existing in the duration set to the duration are repeatedly transmitted. For example, when the duration is set to N slots, when PDCCHs can be monitored in each slot within the duration, it may be assumed that PDCCHs transmitted in each occasion are repeatedly transmitted.

According to an embodiment of the present disclosure, the UE may assume that repetitive transmission of the PDCCH is applied in transmission of a specific DCI format. For example, for a DCI format corresponding to WUS or GTS, it may be assumed that the terminal is repeatedly transmitted N times. At this time, the number of repetitive transmissions N may be determined implicitly from a predetermined or set from the base station, or from other system parameters (for example, the number of actually transmitted SSBs or the number of TCI states set in the control region in which the corresponding PDCCH is transmitted) I can.

According to an embodiment of the present disclosure, the terminal may be configured to whether or not the PDCCH is repeatedly transmitted from the base station. That is, depending on the settings of the base station, the PDCCH may be repeatedly transmitted or may not be repeatedly transmitted.

<Example 6-2>

In the 6-2 embodiment of the present disclosure, transmission/reception by applying different beams to each of the repeatedly transmitted PDCCHs (i.e., applying different TCI states to each PDCCH transmission or different QCLs in the terminal (especially QCL It is possible to perform reception on the assumption that it may correspond to type D).

According to an embodiment of the present disclosure, the terminal may receive a MAC CE command for activating one of one or a plurality of TCI states set in the control region from the base station. For example, the UE has M TSI states, {TCI#0, TCI#1,… for the control region. , TCI#(M-1)} can be set, and among them, a MAC CE command that activates a specific TCI#m can be received. For PDCCH monitoring occasions set to be repeatedly transmitted N times, the UE sequentially starts from the first PDCCH monitoring occasion of the repeated transmission, starting with TCI#m, in the order of increasing (or decreasing) the index of the TCI state, different TCIs Assuming the state, the PDCCH can be monitored. For example, PDCCH occasions that are repeatedly transmitted N times {#0, #1, #2,… , #(N-1)}, #0 assumes TCI#m, #1 assumes TCI#(m+1), #2 assumes TCI#(m+2), #3 TCI#(m+3),… , #(N-1) may perform monitoring for each PDCCH occasion assuming a QCL corresponding to TCI#(m+N-1).

According to an embodiment of the present disclosure, the terminal may receive a MAC CE command for activating one or more TCI states from among one or a plurality of TCI states set in the control region from the base station. For example, the UE has M TSI states, {TCI#0, TCI#1,… for the control region. , TCI#(M-1)} can be set, among which N specific TCI states {TCI#m, TCI#(m+1),… , TCI#(m+N-1)} can receive a MAC CE command. The activated N TCI states may be mapped one-to-one to each of the PDCCH occasions that are repeatedly transmitted N times. That is, for example, PDCCH occasions that are repeatedly transmitted N times are {#0, #1, #2, ... , #(N-1)}, #0 assumes TCI#m, #1 assumes TCI#(m+1), #2 assumes TCI#(m+2), #3 TCI#(m+3),… , #(N-1) may perform monitoring for each PDCCH occasion assuming a QCL corresponding to TCI#(m+N-1).

According to an embodiment of the present disclosure, the UE may not set the TCI state for the control region from the base station, or may not receive a MAC CE command for activating the TCI state when one or more TCI states have been set. In this case, the UE It can be assumed that the SS/PBCH block identified in the random access process and the DMRS of the control region are QCL. If the identified SS/PBCH block is SS/PBCH#m, the UE for PDCCH monitoring occasions set to be repeatedly transmitted N times, sequentially from the first PDCCH monitoring occasion of repeated transmission, starting with SS/PBCH#m In the order of increasing (or decreasing) the index of the SS/PBCH, it is possible to perform monitoring on the corresponding PDCCH assuming different QCLs. In this case, the SS/PBCH index may correspond to an index for the actually transmitted SS/PBCH. For example, if the total number of SS/PBCHs actually transmitted is S, the SS/PBCH index will be determined as {SS/PBCH#0, SS/PBCH#1, .., SS/PBCH#(S-1)}. I can. Information on the actually transmitted SS/PBCH may be received from the base station through higher layer signaling (eg, SIB or RRC). For example, PDCCH occasions that are repeatedly transmitted N times {#0, #1, #2,… , #(N-1)}, #0 assumes SS/PBCH#m, #1 assumes SS/PBCH #(m+1), #2 assumes SS/PBCH #(m+2) ), in #3, SS/PBCH #(m+3),… , #(N-1) may perform monitoring for each PDCCH occasion assuming a QCL corresponding to SS/PBCH #(m+N-1).

Alternatively, the same method may be applied starting with the first SS/PBCH index regardless of the identified SS/PBCH index. For example, PDCCH occasions that are repeatedly transmitted N times {#0, #1, #2,… , #(N-1)}, #0 assumes SS/PBCH#0, #1 assumes SS/PBCH#1, #2 assumes SS/PBCH #2, #3 assumes SS /PBCH#3,… , #(N-1) may perform monitoring for each PDCCH occasion assuming a QCL corresponding to SS/PBCH#(N-1).

In performing the above-described embodiment, the TCI state index or the SS/PBCH index may be modulated so as not to exceed a set maximum index value. For example, the PDCCH monitoring occasion #n may be monitored by assuming TCI#(mod(m+n-1,N)) or SS/PBCH(mod(m+n-1,S)). Here, mod(A,B) is an operator that outputs the remainder obtained by dividing A by B, and the number of set TCI states and S may be respectively defined as an overview of the actually transmitted SS/PBCH.

In order to perform the above-described embodiments of the present disclosure, a transceiver, a memory, and a processor of a terminal and a base station are shown in FIGS. 34 and 35, respectively. In the above-described embodiments, a method of notifying configuration information on a power saving signal, a method of transmitting and receiving a power saving signal, a method of controlling a PDCCH monitoring according to the method, and a method of transmitting and receiving a base station and a terminal to apply a data transmission/reception operation accordingly . In order to do this, the transmission/reception unit, memory, and processor of the base station and the terminal must each operate according to the embodiment.

34 illustrates the structure of a terminal according to an embodiment of the present disclosure.

Referring to FIG. 34, the terminal may include a transceiver 3401, a memory 3402, and a processor 3403. However, the components of the terminal are not limited to the above-described example. For example, the terminal may include more or fewer components than the above-described components. In addition, the transmission/reception unit 3401, the memory 3402, and the processor 3403 may be implemented in the form of a single chip.

According to an embodiment of the present disclosure, the transceiver 3401 may transmit and receive signals with a base station. The above-described signal may include control information and data. To this end, the transceiver 3401 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. In addition, the transceiver 3401 may receive a signal through a wireless channel, output it to the processor 3403, and transmit a signal output from the processor 3403 through a wireless channel.

According to an embodiment of the present disclosure, the memory 3402 may store programs and data required for operation of a terminal. In addition, the memory 3402 may store control information or data included in signals transmitted and received by the terminal. The memory 3502 may be composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media. Also, the memory 3402 may be formed of a plurality of memories. According to an embodiment of the present disclosure, the memory 3402 may control PDCCH monitoring of a terminal and store a program for setting a power saving signal and receiving a power saving signal.

According to an embodiment of the present disclosure, the processor 3403 may control a series of processes in which the terminal may operate according to the above-described embodiments of the present disclosure. For example, the processor 3403 may control monitoring of a downlink control channel according to embodiments of the present disclosure.

Specifically, the processor 3403 receives setting information on the power saving signal from the base station, monitors the power saving signal from the base station based on the setting information on the power saving signal from the base station, and based on the monitoring, the power saving signal And control each configuration of the terminal to control the monitoring setting of the downlink control channel of the terminal based on the power saving signal.

Further, the processor 3403 may include a plurality of processors, and by executing a program stored in the memory 3402, a method of controlling monitoring of a downlink control channel according to embodiments of the present disclosure, a power saving signal Regarding the setting and the method of receiving a power saving signal can be performed.

35 shows a structure of a base station according to an embodiment of the present disclosure.

Referring to FIG. 35, a base station may include a transceiver 3501, a memory 3502, and a processor 3503. However, the components of the base station are not limited to the above-described example. For example, the terminal may include more or fewer components than the above-described components. In addition, the transmission/reception unit 3501, the memory 3502, and the processor 3503 may be implemented in the form of a single chip.

According to an embodiment of the present disclosure, the transmission/reception unit 3501 may transmit and receive signals with a terminal. The above-described signal may include control information and data. To this end, the transceiving unit 3501 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. In addition, the transceiver 3501 may receive a signal through a wireless channel, output it to the processor 3503, and transmit a signal output from the processor 3503 through a wireless channel.

According to an embodiment of the present disclosure, the memory 3502 may store programs and data required for operation of a base station. In addition, the memory 3502 may store control information or data included in signals transmitted and received by the base station. The memory 3502 may be composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media. Also, the memory 3502 may be formed of a plurality of memories. According to an embodiment of the present disclosure, the memory 3502 may store a method for controlling monitoring of a downlink control channel of a terminal of a base station, settings for a power saving signal, and a program for generating and transmitting a power saving signal. .

According to an embodiment of the present disclosure, the processor 3503 may control a series of processes so that the base station may operate according to the embodiment of the present disclosure described above. For example, the processor 3503 may control a method of controlling monitoring of a downlink control channel of a terminal, a power saving signal, and each configuration of a base station to generate and transmit a power saving signal.

In addition, the processor 3503 may include a plurality of processors, and a method of controlling monitoring of a downlink control channel of a terminal according to embodiments of the present disclosure by executing a program stored in the memory 3502, power saving It is possible to perform a method of setting a signal and generating and transmitting a power saving signal.

The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium or computer program product storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium or a computer program product are configured to be executable by one or more processors in an electronic device (device). The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other types of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all of them. In addition, a plurality of configuration memories may be included.

In addition, the program is accessed through a communication network such as the Internet, Intranet, LAN (Local Area Network), WLAN (Wide LAN), or SAN (Storage Area Network), or a communication network composed of a combination thereof. It may be stored in an (access) attachable storage device. Such a storage device may access a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, constituent elements included in the present disclosure are expressed in the singular or plural according to the presented specific embodiments. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are merely provided with specific examples to easily describe the technical content of the present disclosure and to aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those of ordinary skill in the art to which the present disclosure belongs that other modified examples based on the technical idea of the present disclosure may be implemented. In addition, each of the above embodiments can be operated in combination with each other as needed. For example, portions of an embodiment of the present disclosure and another embodiment may be combined with each other to operate a base station and a terminal. Further, the embodiments of the present disclosure may be applied to other communication systems, and other modifications based on the technical idea of the embodiments may also be implemented. For example, embodiments may be applied to an LTE system, a 5G or NR system, and the like.

Claims (20)

In a method for controlling monitoring of a downlink control channel of a terminal,
Receiving configuration information for a power saving signal from a base station;
Monitoring a power saving signal from the base station based on configuration information for the power saving signal from the base station;
Detecting the power saving signal based on the monitoring; And
And controlling a monitoring configuration of a downlink control channel (PDCCH) of the terminal based on the power saving signal. The method of claim 1,
Detecting the power saving signal based on the monitoring,
Monitoring a predetermined search space at at least one of an active time of the terminal or an inactive time of the terminal; And
And detecting the power saving signal based on the monitoring. The method of claim 1,
Setting information for the power saving signal,
Control region information through which the power saving signal is transmitted, search space information through which the power saving signal is transmitted, information on the Occasion period of the power saving signal, offset information of the power saving signal, downlink control information corresponding to the power saving signal The method comprising at least one of the format information of. The method of claim 1,
The power saving signal,
The method comprising at least one of PDCCH monitoring period information of the terminal, DRX (discontinuous reception) related configuration information of the terminal, and state change indication information of the terminal. The method of claim 1,
The format of the downlink control information corresponding to the power saving signal detected in the active time of the terminal and the format of the downlink control information corresponding to the power saving signal detected in the inactive time of the terminal are different. The method of claim 1,
The downlink control information corresponding to the power saving signal detected in the active time of the terminal is scrambled with a Radio Network Temporary Identifier (RNTI) different from the downlink control information detected in the inactive time of the terminal. The method of claim 1,
Controlling the monitoring setting of the downlink control channel of the terminal based on the power saving signal,
The method of changing the monitoring period of the downlink control channel (PDCCH) of the terminal based on a power saving signal in the active time of the terminal. The method of claim 1,
Controlling the monitoring setting of the downlink control channel of the terminal based on the power saving signal,
The method of stopping the monitoring of the downlink control channel of the terminal for a predetermined time from a predetermined point in time based on a power saving signal at the inactive time of the terminal. In a method for a base station to control monitoring of a downlink control channel of a terminal,
Transmitting configuration information for a power saving signal to a terminal;
Transmitting a power saving signal to the terminal based on configuration information for the power saving signal; And
And transmitting control information to the terminal based on the monitoring setting of a downlink control channel (PDCCH) of the terminal that is set based on the power saving signal. The method of claim 9,
Transmitting a power saving signal to the terminal based on the setting information for the power saving signal,
The method of transmitting a DCI corresponding to the power saving signal arranged to be the same size as the size of other downlink control information (DCI) monitored in the search space set in the terminal. In the terminal that controls the monitoring of the downlink control channel, the terminal
Transceiver; And
Receiving setting information for a power saving signal from a base station, monitoring a power saving signal from the base station based on the setting information for a power saving signal from the base station, detecting the power saving signal based on the monitoring, A terminal comprising at least one processor coupled to the transceiver for controlling a monitoring configuration of a downlink control channel (PDCCH) of the terminal based on the power saving signal. The method of claim 11,
The processor,
The terminal is configured to monitor a predetermined search space at at least one of an active time of the terminal or an inactive time of the terminal, and to detect the power saving signal based on the monitoring. The method of claim 11,
Setting information for the power saving signal,
Control region information through which the power saving signal is transmitted, search space information through which the power saving signal is transmitted, information on the Occasion period of the power saving signal, offset information of the power saving signal, downlink control information corresponding to the power saving signal The terminal that includes at least one of the format information of. The method of claim 11,
The power saving signal,
The terminal comprising at least one of PDCCH monitoring period information of the terminal, DRX (Discontinuous Reception) related configuration information of the terminal, and state change indication information of the terminal. The method of claim 11,
The terminal in which the format of the downlink control information corresponding to the power saving signal detected in the active time of the terminal and the format of the downlink control information corresponding to the power saving signal detected in the inactive time of the terminal are different. The method of claim 11,
The downlink control information corresponding to the power saving signal detected in the active time of the terminal is scrambled with a Radio Network Temporary Identifier (RNTI) different from the downlink control information detected in the inactive time of the terminal. The method of claim 11,
The processor,
The terminal to change the monitoring period of the downlink control channel (PDCCH) of the terminal based on a power saving signal in the active time of the terminal. The method of claim 11,
The processor,
The terminal to stop monitoring of the downlink control channel of the terminal for a predetermined time from a predetermined point in time based on a power saving signal in the inActive time of the terminal. In the base station for controlling the monitoring of the downlink control channel of the terminal, the base station,
Transceiver; And
A downlink control channel of the terminal that transmits configuration information on a power saving signal to the terminal, transmits a power saving signal to the terminal based on the configuration information on the power saving signal, and is set based on the power saving signal A base station comprising at least one processor coupled with the transceiver for transmitting control information to the terminal based on a monitoring setting of (PDCCH). The method of claim 19,
The processor,
The base station to transmit a DCI corresponding to the power saving signal arranged to have the same size as the size of other downlink control information (DCI) monitored in the search space set in the terminal.

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