KR102156695B1 - Method for switching bandwidth part in new radio and Apparatuses thereof - Google Patents

Abstract

The present embodiments are directed to a method and apparatus for switching a bandwidth part to support a terminal using various bandwidth parts in a next-generation wireless access network. In one embodiment, a bandwidth part for reducing power consumption when a terminal transmits and receives wireless data In the method of switching, the step of transmitting physical layer capability information including bandwidth part switching delay type information, different from the activated bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal A bandwidth part indication field in consideration of the step of receiving downlink control information including scheduling information for a data channel and a bandwidth part indication field indicating any one bandwidth part, and in consideration of a switching time determined according to the bandwidth part switching delay type information Including the step of activating the bandwidth part indicated according to the value of and transmitting and receiving the data channel according to the scheduling information, wherein the bandwidth part indicated according to the value of the bandwidth part indication field is determined by reflecting the traffic load of the terminal. Provides a way to do it.

Description

TECHNICAL FIELD [Method for switching bandwidth part in new radio and Apparatuses thereof]

The present embodiments propose a method and apparatus for switching a bandwidth part to support a terminal using various bandwidth parts in a next-generation radio access network (hereinafter, referred to as “New Radio”).

3GPP recently approved "Study on New Radio Access Technology", a study item for research on next-generation radio access technology (that is, 5G radio access technology), and based on this, RAN WG1 for each NR (New Radio) The design of frame structures, channel coding and modulation, waveforms and multiple access schemes is in progress. In contrast to LTE/LTE-Advanced, NR is required to be designed to satisfy various requirements for each subdivided and detailed usage scenario as well as an improved data rate.

As representative usage scenarios of NR, eMBB (enhancement mobile broadband), mMTC (massive machine type communication), and URLLC (Ultra Reliable and Low Latency Communications) are proposed, and LTE/LTE-Advanced contrasts to satisfy the needs of each usage scenario A flexible frame structure design is required.

In particular, when the terminal of NR uses various bandwidth parts (BWP), the need to set a specific and efficient method for switching to a bandwidth part suitable for the terminal or communication environment when transmitting and receiving a data channel increases. have.

An object of the present embodiments is to provide a specific method of setting and activating a bandwidth part suitable for a terminal or a communication environment for transmission and reception of a data channel between a terminal and a base station in a next-generation wireless network.

An embodiment conceived to solve the above-described problem is in a method for a terminal to switch a bandwidth part to reduce power consumption when transmitting and receiving wireless data, a bandwidth part (BWP) switching delay type information Transmitting physical layer capability information including, a bandwidth part indicating an activated bandwidth part and one other bandwidth part among one or more bandwidth parts included in a bandwidth part set configured in the terminal A bandwidth part indication field in consideration of the step of receiving downlink control information including a bandwidth part indicator field and scheduling information for a data channel, and a transition time determined according to the bandwidth part switching delay type information Including the step of activating the bandwidth part indicated according to the value of and transmitting and receiving the data channel according to the scheduling information, wherein the bandwidth part indicated according to the value of the bandwidth part indication field reflects the traffic load of the terminal. It provides a method characterized in that it is determined.

In addition, in an embodiment, in a method for a base station to switch a bandwidth part to reduce power consumption when transmitting and receiving wireless data, receiving physical layer capability information including information on a bandwidth part switching delay type from a terminal, Determining a bandwidth part indication field indicating an active bandwidth part and one other bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal by reflecting the traffic load, a bandwidth part indication field and data When the bandwidth part indicated according to the value of the bandwidth part indication field is activated in consideration of the step of transmitting downlink control information including scheduling information for the channel to the terminal and the switching time determined according to the bandwidth part switching delay type information, It provides a method for transmitting and receiving a data channel according to scheduling information.

In addition, in an embodiment, in a method for a terminal to switch a bandwidth part, transmitting physical layer capability information including bandwidth part switching delay type information, one or more bandwidth parts included in a bandwidth part set configured in the terminal Receiving downlink control information including scheduling information for a data channel and a bandwidth part indication field indicating one of the other bandwidth parts from the active bandwidth part, and a switching time determined according to bandwidth part switching delay type information In consideration of, a method including activating a bandwidth part indicated according to a value of a bandwidth part indication field, and transmitting and receiving a data channel according to scheduling information is provided.

In addition, in an embodiment, in a method for a base station to switch a bandwidth part, receiving physical layer capability information including bandwidth part switching delay type information from a terminal, one or more bandwidths included in a bandwidth part set configured in the terminal Determining a bandwidth part indication field indicating any one bandwidth part different from the activated bandwidth part among the parts, transmitting downlink control information including the bandwidth part indication field and scheduling information for the data channel to the terminal And when a bandwidth part indicated according to a value of a bandwidth part indication field is activated in consideration of a switching time determined according to bandwidth part switching delay type information, transmitting and receiving a data channel according to scheduling information.

In addition, in an embodiment, in a terminal for switching a bandwidth part, a transmitter for transmitting physical layer capability information including bandwidth part switching delay type information, and activation of one or more bandwidth parts included in a bandwidth part set configured in the terminal Consider the switching time determined according to the bandwidth part indication field indicating one of the other bandwidth parts and the downlink control information including the scheduling information for the data channel and the bandwidth part switching delay type information Accordingly, a terminal including a control unit configured to activate a bandwidth part indicated according to a value of a bandwidth part indication field and transmit/receive a data channel according to scheduling information is provided.

In addition, in an embodiment, in a base station for switching a bandwidth part, a receiving unit for receiving physical layer capability information including bandwidth part switching delay type information from a terminal, one or more bandwidth parts included in a bandwidth part set configured in the terminal A control unit for determining a bandwidth part indication field indicating any one bandwidth part other than the active bandwidth part among the active bandwidth parts, and downlink control information including the bandwidth part indication field and scheduling information for the data channel are transmitted to the terminal, and the bandwidth part When the bandwidth part indicated according to the value of the bandwidth part indication field is activated in consideration of the switching time determined according to the switching delay type information, a base station including a transmitter for transmitting a data channel according to scheduling information is provided.

According to the present embodiments, it is possible to provide a specific method of setting and activating a bandwidth part suitable for a terminal or a communication environment for transmission and reception of a data channel between a terminal and a base station in a next-generation wireless network.

1 is a diagram showing the alignment of OFDM symbols in the case of using different subcarrier spacing according to the present embodiments.
2 is a diagram illustrating a conceptual example of a bandwidth part in this embodiment.
3 is a diagram illustrating a conceptual example of setting a plurality of bandwidth parts in the present embodiment.
FIG. 4 is a diagram illustrating a conceptual example of setting a UE-specific bandwidth part in this embodiment.
5 is a diagram illustrating a procedure for a terminal to switch a bandwidth part by reflecting a traffic load of a terminal in the present embodiment.
6 is a diagram illustrating a procedure for a base station to switch a bandwidth part by reflecting a traffic load of a terminal in this embodiment.
7 is a diagram illustrating a procedure for a terminal to switch a bandwidth part in this embodiment.
8 is a diagram illustrating a procedure for a base station to switch a bandwidth part in this embodiment.
9 and 10 are diagrams for explaining whether a bandwidth part indicator field is included according to a downlink control information format (DCI format) in this embodiment.
11 to 14 are diagrams showing conceptual examples of switching of a bandwidth part in this embodiment.
15 is a diagram showing a configuration of a base station according to the present embodiments.
16 is a diagram showing a configuration of a terminal according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

In the present specification, a wireless communication system refers to a system for providing various communication services such as voice and packet data. The wireless communication system includes a user equipment (UE) and a base station (BS).

A user terminal is a generic concept that refers to a terminal in wireless communication, as well as UE (User Equipment) in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio), as well as MS (Mobile Station) and UT in GSM. It should be interpreted as a concept that includes all of (User Terminal), SS (Subscriber Station), and wireless device.

A base station or cell generally refers to a station that communicates with a user terminal, and Node-B (Node-B), evolved Node-B (eNB), gNB (gNode-B), LPN (Low Power Node) ), Sector, Site, various types of antennas, BTS (Base Transceiver System), Access Point, Points (e.g., Transmit Point, Receiving Point, Transceiver Point), Relay Node ( Relay Node), mega cell, macro cell, micro cell, pico cell, femto cell, RRH (Remote Radio Head), RU (Radio Unit), small cell, etc.

In the various cells listed above, since there is a base station controlling each cell, the base station can be interpreted in two meanings. 1) In relation to the radio area, the device itself may provide a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell, or 2) the radio area itself may be indicated. In 1), all devices that are controlled by the same entity that provide a predetermined wireless area are controlled by the same entity, or all devices that interact to form a wireless area in collaboration are instructed to the base station. Points, transmission/reception points, transmission points, reception points, etc. are an embodiment of the base station according to the configuration method of the wireless area. In 2), it is possible to instruct the base station to the radio region itself that receives or transmits a signal from the viewpoint of the user terminal or the viewpoint of a neighboring base station.

In the present specification, a cell refers to a component carrier having coverage of a signal transmitted from a transmission/reception point or a coverage of a signal transmitted from a transmission/reception point, and the transmission/reception point itself. I can.

In the present specification, the user terminal and the base station are two (Uplink or Downlink) transmission/reception subjects used to implement the technology or technical idea described in the present invention, and are used in a comprehensive sense, and are not limited by a specific term or word. Does not.

Here, the uplink (Uplink, UL, or uplink) refers to a method of transmitting and receiving data to the base station by the user terminal, and the downlink (Downlink, DL, or downlink) is transmitting and receiving data to the user terminal by the base station. It means the way to do it.

For uplink transmission and downlink transmission, a Time Division Duplex (TDD) scheme transmitted using different times may be used, and a frequency division duplex (FDD) scheme transmitted using different frequencies, a TDD scheme and an FDD scheme Mixed use methods can be used.

In addition, in a wireless communication system, a standard is configured by configuring uplink and downlink based on one carrier or carrier pair.

Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Uplink Control CHannel (PUCCH), and the like, and It is configured with the same data channel to transmit data.

Downlink may refer to a communication or communication path from multiple transmission/reception points to a terminal, and uplink may refer to a communication or communication path from a terminal to multiple transmission/reception points. In this case, in the downlink, the transmitter may be a part of the multiple transmission/reception points, and the receiver may be a part of the terminal. In addition, in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of the multiple transmission/reception points.

Hereinafter, a situation in which signals are transmitted/received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH may be expressed in the form of'transmitting and receiving PUCCH, PUSCH, PDCCH and PDSCH'.

Meanwhile, high layer signaling described below includes RRC signaling that transmits RRC information including RRC parameters.

The base station performs downlink transmission to the terminals. The base station is a physical downlink for transmitting downlink control information such as scheduling required for reception of a downlink data channel, which is a main physical channel for unicast transmission, and scheduling approval information for transmission in an uplink data channel. Can transmit a control channel. Hereinafter, transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

There are no restrictions on the multiple access scheme applied in the wireless communication system. Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA), OFDM-TDMA, OFDM-FDMA, Various multiple access techniques such as OFDM-CDMA can be used. Here, NOMA includes Sparse Code Multiple Access (SCMA) and Low Density Spreading (LDS).

An embodiment of the present invention is used in resource allocation in asynchronous wireless communication evolving to LTE/LTE-Advanced, IMT-2020 through GSM, WCDMA, HSPA, and synchronous wireless communication field evolving to CDMA, CDMA-2000 and UMB. Can be applied.

In this specification, a machine type communication (MTC) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, in this specification, the MTC terminal may mean a terminal defined as a specific category for supporting low cost (or low complexity) and/or coverage enhancement.

In other words, in this specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category/type that performs an LTE-based MTC-related operation. Or, in this specification, the MTC terminal supports improved coverage compared to the existing LTE coverage, or the UE category/type defined in the existing 3GPP Release-12 or lower supporting low power consumption, or a newly defined Release-13 low cost (or low complexity) may mean UE category/type. Or, it may mean a further enhanced MTC terminal defined in Release-14.

In the present specification, a NB-IoT (NarrowBand Internet of Things) terminal means a terminal that supports wireless access for cellular IoT. The objectives of the NB-IoT technology include improved indoor coverage, support for large-scale low-speed terminals, low latency sensitivity, ultra-low cost terminals, low power consumption, and an optimized network structure.

As representative usage scenarios in New Radio (NR), which is currently being discussed in 3GPP, eMBB (enhanced mobile broadband), mMTC (massive machine type communication), and URLLC (Ultra Reliable and Low Latency Communication) have been proposed.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR (New Radio) Can be interpreted as a meaning used in the past or present, or in various meanings used in the future.

Meanwhile, in the present specification, a technical idea is described based on two nodes of a terminal and a base station, but this is only for convenience of understanding, and the same technical idea may be applied between the terminal and the terminal. For example, the base station described below is an exemplary disclosure and description of one node performing communication with the terminal, and may be replaced by another terminal or an infrastructure device performing communication with the terminal, if necessary.

That is, the present technical idea may be applied to not only communication between a terminal and a base station, but also communication between terminals (Device to Device), side link communication (Sidelink), vehicle communication (V2X), and the like. In particular, it can be applied to communication between terminals in the next-generation radio access technology, and terms such as signals and channels in the present specification can be variously modified and applied according to the type of communication between terminals.

For example, PSS and SSS may be applied by changing terms to Primary D2D Synchronization Signal (PSSS) and Secondary D2D Synchronization Signal (SSSS) in communication between terminals, respectively. In addition, the channel for transmitting broadcast information such as the above-described PBCH is changed to PSBCH, the channel for transmitting data in the sidelink such as PUSCH and PDSCH is changed to PSSCH, and the channel for transmitting control information such as PDCCH and PUCCH is changed to PSCCH. Can be applied. Meanwhile, in communication between terminals, a discovery signal is required, which is transmitted and received through the PSDCH. However, it is not limited to these terms.

Hereinafter, in the present specification, the technical idea is described on an exemplary basis for communication between a terminal and a base station, but the present technical idea may be applied by replacing a base station node with another terminal as needed.

New Radio (NR)

3GPP recently approved "Study on New Radio Access Technology", a study item for research on next-generation radio access technology (that is, 5G radio access technology), and based on this, a frame structure for each NR (New Radio), Design for channel coding and modulation, waveform and multiple access scheme (frame structure, channel coding & modulation, waveform & multiple access scheme) is in progress.

NR is required to be designed to satisfy various requirements for each detailed and detailed usage scenario, as well as an improved data rate compared to LTE/LTE-Advanced. In particular, eMBB (enhancement Mobile BroadBand), mMTC (massive MTC), and URLLC (Ultra Reliable and Low Latency Communications) were raised as representative usage scenarios of NR, and the requirements for each usage scenario As a method to meet the requirements of LTE/LTE-Advanced, a flexible frame structure design is required.

Specifically, eMBB, mMTC, and URLLC are being considered as representative usage scenarios of NR being discussed in 3GPP. Since each usage scenario has different requirements for data rates, latency, coverage, etc., each usage through a frequency band constituting an arbitrary NR system Radio resource units based on different numerology (eg, subcarrier spacing, subframe, TTI, etc.) are used as a method for efficiently satisfying the requirements for each usage scenario. There is a need for an efficient multiplexing method.

As a method for this, support by multiplexing based on TDM, FDM or TDM/FDM through one NR carrier for numerology having different subcarrier spacing (SCS) values. Discussion has been made on a method and a method of supporting one or more time units in configuring a scheduling unit in a time domain. In this regard, in NR, a subframe has been defined as a type of time domain structure, and a reference numerology for defining a corresponding subframe duration As an example, it was decided to define a single subframe duration consisting of 14 OFDM symbols of normal CP overhead based on 15kHz Sub-Carrier Spacing (SCS) as in LTE. Accordingly, in NR, a subframe has a time duration of 1 ms. However, unlike LTE, a subframe of NR is an absolute reference time duration, and a slot and a mini-slot as a time unit that is the basis of the actual uplink/downlink data scheduling. ) Can be defined. In this case, the number of OFDM symbols constituting the corresponding slot and the y value are determined to have a value of y=14 regardless of the SCS value in the case of normal CP.

Accordingly, a random slot is composed of 14 symbols, and all symbols are used for downlink transmission or all symbols are used for uplink transmission according to the transmission direction of the corresponding slot. ), or may be used in the form of a downlink portion (DL portion) + (gap) + uplink portion (UL portion).

In addition, a mini-slot composed of fewer symbols than the slot is defined in an arbitrary numerology (or SCS), and based on this, a short time domain scheduling interval for uplink/downlink data transmission/reception (time-domain Scheduling interval) may be set or a long time-domain scheduling interval for uplink/downlink data transmission and reception may be configured through slot aggregation.

In particular, in the case of transmission and reception of latency critical data such as URLLC, when scheduling is performed in units of slots based on 1 ms (14 symbols) defined in a newer roller frame structure with a small SCS value such as 15 kHz, Since it may be difficult to meet the latency requirement, for this purpose, a mini-slot composed of fewer OFDM symbols than the corresponding slot is defined, and based on this, a latency critical such as the corresponding URLLC. It can be defined that scheduling for one data is performed.

Alternatively, as described above, by multiplexing and supporting neuron rollers having different SCS values in one NR carrier by a TDM method or an FDM method, based on a slot (or mini-slot) length defined for each neuron roller As a result, a method of scheduling data according to the latency requirement is also being considered. For example, as shown in FIG. 1, when the SCS is 60 kHz, the symbol length is reduced by about 1/4 compared to the SCS 15 kHz, so when one slot is configured with the same 14 OFDM symbols, the 15 kHz-based slot length is While it becomes 1ms, the 60kHz-based slot length is reduced to about 0.25ms.

As described above, in NR, by defining different SCS or different TTI lengths, discussions on how to satisfy the requirements of URLLC and eMBB are in progress.

Wide bandwidth operations

In the case of the existing LTE system, a scalable bandwidth operation for any LTE component carrier (CC) was supported. That is, according to the frequency deployment scenario, in configuring one LTE CC, a random LTE operator could configure a bandwidth of a minimum of 1.4 MHz to a maximum of 20 MHz, and a normal LTE terminal for one LTE CC. Transmitting and receiving capability of 20 MHz bandwidth was supported.

However, in the case of NR, the design is made to enable support for NR terminals having different transmission/reception bandwidth capabilities through one wideband NR CC, and accordingly, as shown in FIG. 2 below. Likewise, by configuring one or more bandwidth parts (BWP) consisting of subdivided bandwidths for arbitrary NR CCs, a wider bandwidth that is flexible by setting and activating different bandwidth parts for each terminal It is required to support wider bandwidth operation.

Specifically, in the NR, one or more bandwidth parts can be configured through one serving cell configured from the viewpoint of the terminal, and the corresponding terminal is one downlink bandwidth part in the corresponding serving cell. It is defined to be used for uplink/downlink data transmission/reception by activating and one UL bandwidth part. In addition, when a plurality of serving cells are configured in the corresponding terminal, that is, for a terminal to which CA is applied, one downlink bandwidth part or an uplink bandwidth part is activated for each serving cell, and the radio resource of the corresponding serving cell is used. It is defined to be used for transmission and reception of uplink/downlink data.

Specifically, an initial bandwidth part for an initial access procedure of a terminal in a serving cell is defined, and at least one terminal-specific (UE-specific) through dedicated RRC signaling for each terminal A bandwidth part is configured, and a default bandwidth part for a fallback operation may be defined for each terminal.

However, in an arbitrary serving cell, it can be defined to activate and use a plurality of uplink/downlink bandwidth parts at the same time according to the configuration of the terminal's capability and bandwidth part, but in NR rel-15, an arbitrary terminal Is defined to be used by activating only one downlink bandwidth part and an uplink bandwidth part at an arbitrary time.

As described above, in the NR, one or more bandwidth parts may be configured through one serving cell configured from a terminal perspective. Specifically, in the case of a serving cell configured with an asymmetric (unpaired, that is, TDD) or symmetrical (that is, FDD) spectrum, according to a transmission direction supported by the corresponding serving cell, at least one or more downlink bandwidths A part and an uplink bandwidth part can be configured respectively, and the base station activates only one downlink bandwidth part and an uplink bandwidth part at a given time for each terminal, and each uplink/downlink radio channel and signal (e.g. For example, it is defined to be used for transmission and reception of PDCCH/PDSCH, PUSCH/PUCCH, etc.). However, in the case of a downlink-only (DL-only) or uplink-only (UL-only) serving cell, only a downlink bandwidth part and an uplink bandwidth part may be configured and activated, respectively.

Accordingly, the UE may independently configure and activate bandwidth parts for Scells configured through CA in addition to Pcells for which initial access has been made.

When one or more bandwidth parts are configured in any serving cell configured for an arbitrary terminal as described above, the terminal may activate and use one bandwidth part at an arbitrary time. Specifically, for downlink transmission and reception, one downlink in any downlink subframe/slot/mini-slot (DL subframe/slot/mini-slot) among one or more downlink bandwidth parts configured for the corresponding terminal in the corresponding serving cell The bandwidth part is activated and used. Likewise, for uplink transmission and reception, one uplink bandwidth in any uplink subframe/slot/mini-slot (UL subframe/slot/mini-slot) among one or more uplink bandwidth parts configured for the corresponding terminal in the corresponding serving cell Activate the part and use it.

Accordingly, the base station sets one or more downlink bandwidth parts having different bandwidths and one or more uplink bandwidth parts having different bandwidths for a certain terminal, and according to the traffic load for the corresponding terminal. You can activate and use the appropriate bandwidth part. In particular, in NR, an NR cell can be configured based on an extended system bandwidth compared to LTE, and transmission and reception of radio signals and radio channels based on the extended system bandwidth can be a big burden in terms of power consumption of the terminal. have.

In this respect, as described above, in a method for a base station to set and operate a bandwidth part for an arbitrary terminal, a bandwidth part having various bandwidths is set and a bandwidth part of an appropriate bandwidth according to the traffic load of the corresponding terminal. By activating and transmitting and receiving wireless data, battery power consumption of the corresponding terminal can be greatly reduced. For example, when the system bandwidth of an arbitrary NR cell is 100 MHz, in setting the bandwidth part for the corresponding terminal, each of a first bandwidth part of 10 MHz, a second bandwidth part based on 20 MHz, and a third bandwidth part based on 40 MHz , 80MHz-based 4th bandwidth part is set, and by activating and using an appropriate bandwidth part according to the traffic load of the corresponding terminal at any time among the 4 bandwidth parts of the 1 to 4, unnecessary broadband By maintaining the base transmission/reception bandwidth (that is, 100MHz corresponding to the system bandwidth), the power consumption of the RF stage can be greatly reduced.

As described above, the configuration and indication of the bandwidth part in the NR system can bring a large gain in terms of battery power consumption of the terminal, and the present invention proposes a specific method of operating the bandwidth part for this. Specifically, a method for configuring a plurality of bandwidth parts for an arbitrary terminal, indicating a bandwidth part for activating and switching a bandwidth part, and a specific method for securing a bandwidth part transition time accordingly is proposed.

An indication of activation/deactivation of a downlink bandwidth part and an uplink bandwidth part for an arbitrary terminal may be made through downlink control information (DCI) transmitted through the PDCCH. Specifically, activation and deactivation of a downlink bandwidth part may be performed through a downlink assignment DCI (DL assignment DCI) including resource allocation information for the PDSCH. In addition, activation and deactivation of an uplink bandwidth part may be performed through an UL grant including resource allocation information for PUSCH.

In this embodiment, the uplink/downlink bandwidth part (DL/UL bandwidth part) activation/deactivation through scheduling DCI, that is, active uplink/downlink bandwidth part switching (active DL/UL bandwidth part switching) A related specific operation scheme and an active DL/UL bandwidth part switching method through DCI that does not include scheduling information are proposed.

However, in the present embodiment, downlink bandwidth part switching for a certain terminal in a certain serving cell deactivates the downlink bandwidth part in the current active state and a new downlink bandwidth part It means a series of processes to activate (activation). Likewise, UL bandwidth part switching for a certain UE in a serving cell deactivates the currently active uplink bandwidth part and activates a new uplink bandwidth part. It means a series of processes.

Any NR component carrier (CC, Component Carrier) may be composed of one or more bandwidth parts. In configuring a bandwidth part in an arbitrary NR CC, the corresponding bandwidth part may be configured to be UE-specific or may be configured to be cell-specific. That is, as shown in FIG. 3, different bandwidth parts may be set for each UE, or the same bandwidth part may be set at all UEs for an arbitrary NR CC. However, FIG. 3 is only an example, and the present embodiment is not limited by the specific bandwidth of the NR CC and the bandwidth for each bandwidth part.

When the bandwidth part is configured for any NR CC, activation of the downlink bandwidth part for PDSCH/PUSCH transmission/reception between the base station and the terminal among the configured bandwidth parts and the uplink bandwidth part for PUCCH/PUSCH transmission/reception Through activation, an uplink/downlink bandwidth part for communication between the terminal and the base station may be set in an arbitrary time instance.

Specifically, one or more bandwidth parts may be configured for any terminal in any NR CC. As an example of a method of configuring a bandwidth part for an arbitrary terminal, independent bandwidth parts may be configured for a downlink bandwidth part and an uplink bandwidth part. Accordingly, an arbitrary terminal may perform reception of a downlink physical signal and a physical channel through one or more downlink bandwidth parts activated by the base station/network among one or more downlink bandwidth parts configured for an arbitrary terminal. Likewise, the terminal transmits an uplink physical signal and a physical channel to the base station through one or more uplink bandwidth parts activated by the base station/network among one or more uplink bandwidth parts configured for an arbitrary terminal.

The embodiments described below may also be applied to a terminal, a base station, and a core network entity (MME) using all mobile communication technologies. For example, the present embodiments may be applied not only to mobile communication terminals to which LTE technology is applied, but also to next-generation mobile communication (5G mobile communication, New-RAT) terminals, base stations, and core network entities (AMF: Access and Mobility Function). For convenience of explanation, the base station may represent an eNB of LTE/E-UTRAN below, and a base station (CU, DU, or CU and DU) in a 5G wireless network in which a central unit (CU) and a distributed unit (DU) are separated An entity implemented as a single logical entity), may also represent a gNB.

In addition, the numerology described in the present specification refers to the numerical characteristics and meaning of values for data transmission and reception, and may be determined by the value of subcarrier spacing (hereinafter, also referred to as SCS or Subcarrier Spacing). . Therefore, that the numerology is different may mean that the subcarrier spacing that determines the numerology is different.

In addition, in this specification, the slot length may be expressed as the number of OFDM symbols constituting the slot, or may be expressed as a time occupied by the slot. For example, when a 15 kHz SCS-based neurology is used, the length of one slot may be represented by 14 OFDM symbols or 1 ms.

And in this specification, the data channel is a concept encompassing a downlink data channel (PDSCH) transmitted by a base station to a terminal or an uplink data channel (PUSCH) transmitted by a terminal to a base station, and transmitting and receiving a data channel between the terminal and the base station This may mean that the terminal receives a downlink data channel from the base station or transmits an uplink data channel to the base station.

Hereinafter, more various embodiments of a specific bandwidth part activation method for supporting bandwidth part-based PDSCH/PUSCH scheduling in an arbitrary NR CC and a method of configuring scheduling control information based thereon will be described in detail. Explain. The embodiments described below may be applied individually or in any combination.

Details on bandwidth part activation

For a downlink bandwidth part configured for an arbitrary terminal, the base station/network can be defined to support activation of a bandwidth part commonly applied to all downlink physical signals and physical channels. have. That is, an arbitrary UE is applied to downlink physical channels such as PDCCH and PDSCH and downlink physical signals such as CSI-RS and DM RS for all downlink bandwidth parts activated by the base station/network. You can expect to receive it. This activated bandwidth part may be referred to as an active bandwidth part.

However, in this case, the UE performs monitoring of at least one control resource set (CORESET, Control Resource Set) set for PDCCH reception for each DL bandwidth part activated by the base station/network. Can be defined.

Additionally, activation of a corresponding DL bandwidth part may be defined to be performed through MAC CE signaling or L1 control signaling. Alternatively, activation of the corresponding DL bandwidth part may be defined to be performed through UE-specific/cell-specific higher layer signaling.

As another method for activation of a DL bandwidth part for an arbitrary terminal, one or more DL bandwidth parts for PDCCH reception including scheduling DCI and one or more DL bandwidth parts for PDSCH reception (Bandwidth part) can be defined to be separately set and activated by the base station/network. That is, a bandwidth part for PDSCH reception separately from activation of a DL bandwidth part for PDCCH reception among a set of DL bandwidth parts configured for a certain terminal. It can be defined that activation is made.

As an embodiment of this, MAC CE signaling of one or more bandwidth parts including CORESET to be monitored for PDCCH reception by the corresponding terminal among the bandwidth parts set for a certain terminal in the base station/network It can be defined to be activated through. That is, among the DL bandwidth parts set for a certain UE, the UE must monitor for PDCCH reception, that is, the DL bandwidth part including at least one CORESET is determined by the base station/network. It can be defined to be activated through signaling or L1 control signaling.

In addition, a DL bandwidth part for transmitting and receiving a PDSCH for a corresponding terminal separately from activation of a DL bandwidth part for receiving the corresponding PDCCH, that is, a DL bandwidth part for receiving the aforementioned PDCCH. A DL bandwidth part for transmitting/receiving a PDSCH in which PDSCH resource allocation can be performed through a downlink assignment DCI may be activated by the base station/network. At this time, the DL bandwidth part for reception of the corresponding PDSCH is activated through a separate information region of the same MAC CE signaling or L1 control signaling as the above-described DL bandwidth part for PDCCH reception, or It can be defined to be activated through separate MAC CE signaling or L1 control signaling (eg, downlink assignment DCI).

As another method of separately setting or activating a bandwidth part for PDCCH reception and setting or activating a bandwidth part for PDSCH reception, a bandwidth part for PDCCH reception is provided. part) is defined to be configured and activated through UE-specific or cell-specific higher layer signaling, and a bandwidth part for PDSCH reception ) May be defined to be activated through downlink assignment DCI or MAC CE signaling or a combination of corresponding MAC CE signaling and downlink assignment DCI.

Specifically, the DL bandwidth part for receiving the PDCCH in an arbitrary terminal is UE-specific higher layer signaling or cell-specific higher layer signaling. signaling), it can be defined to be implicit through the CORESET (Control Resource Set) setting for the corresponding terminal.

That is, when information such as a bandwidth part or frequency resource and a monitoring period to be monitored for PDCCH reception by the corresponding terminal is set through the CORESET setting for PDCCH reception by the corresponding terminal, the corresponding terminal According to this, it may be defined that activation of a bandwidth part in which a corresponding CORESET is set is performed in a corresponding monitoring period. In addition, when the bandwidth part for PDSCH reception is activated, the corresponding PDSCH transmission resource is explicitly or implicitly transmitted through a downlink assignment DCI transmitted through the PDCCH. It can be defined to be indicated for a bandwidth part to which allocation is made, and through this, a DL bandwidth part for receiving a corresponding PDSCH can be defined to be activated.

A concept similar to that of the aforementioned downlink may be applied to activation of an uplink bandwidth part for an arbitrary terminal. That is, it can be defined to support activation of a common UL bandwidth part commonly applied to PUSCH and PUCCH. That is, an arbitrary UE may be defined to enable transmission of PUCCH and PUSCH through all uplink bandwidth parts activated by the base station/network. In this case, activation of a corresponding common UL bandwidth part may be defined to be performed through MAC CE signaling or L1 control signaling. Or, the common UL bandwidth part activation is defined to be performed through UE-specific or cell-specific higher layer signaling. I can.

As another method of activating an uplink bandwidth part for an arbitrary terminal, PUSCH and PUCCH when activating a UL bandwidth part for an arbitrary terminal in a base station/network Each separate UL bandwidth part may be defined to be activated. That is, a bandwidth part for PUCCH transmission and a bandwidth part for PUSCH transmission among a set of UL bandwidth parts configured for an arbitrary terminal are defined to be separately activated. can do.

In this case, similar to the above-described method of configuring a DL bandwidth part for PDCCH reception and a DL bandwidth part for PDSCH reception, a bandwidth part for an arbitrary terminal in an arbitrary base station/network. ) At the time of activation, a UL bandwidth part for PUCCH resource allocation for UCI (Uplink Control Information) transmission and a UL bandwidth part for PUSCH resource allocation for data transmission are separately set And can be defined to be activated. However, when the UCI is piggybacked and transmitted through the PUSCH, the corresponding UCI may be defined to be transmitted through the UL bandwidth part activated for PUSCH transmission.

At this time, the UL bandwidth part for the corresponding PUSCH and the UL bandwidth part for the PUCCH are the same MAC CE signaling or L1 control signaling (e.g., downlink assignment DCI, UL Activated through a separate information area defined in grant, etc.) or separate MAC CE signaling or L1 control signaling (e.g., downlink assignment DCI, UL grant, etc.) ) Can be defined to be activated.

As another method for separately activating the UL bandwidth part for PUCCH transmission and the UL bandwidth part for PUSCH transmission, the UL bandwidth part for PUCCH transmission is the terminal -Activation through UE-specific or cell-specific higher layer signaling or L1 control signaling, or corresponding terminal-specific/cell-specific (UE-specific / It can be defined to be activated through a combination of cell-specific higher layer signaling and L1 control signaling. In addition, the UL bandwidth part for PUSCH transmission is UE-specific/cell-specific (UE-specific/cell) separate from the signaling used for the above-described UL bandwidth part activation for PUCCH. It can be defined to be activated through -specific higher layer signaling, MAC CE signaling, L1 control signaling, or a combination of corresponding signaling.

Specifically, the UL bandwidth part for PUCCH transmission is configured and activated is UE-specific or cell-specific higher layer signaling for an arbitrary UE. ) Through the PUCCH resource configuration (resource configuration) through implicit (that is, the bandwidth part in which the PUCCH resource is set is defined as always or activated (activation) in the corresponding PUCCH transmission period or timing, or ), or defined to be implicitly activated through PUCCH resource indication through L1 control signaling, such as downlink assignment DCI, UL grant, etc. (i.e., L1 control signaling When a PUCCH transmission resource is allocated through, a bandwidth part in which a corresponding PUCCH transmission is performed may be defined as being activated at a corresponding PUCCH transmission time.

In addition, the UL bandwidth part for PUSCH transmission is defined to include implicit or explicit UL bandwidth part allocation information for PUSCH transmission through a UL grant, and the UL grant It can be defined that activation of a UL bandwidth part for PUSCH transmission is performed through bandwidth part allocation information included in (grant).

However, apart from the above-described activation of the common UL bandwidth part for PUCCH/PUSCH transmission, activation of the UL bandwidth part for PRACH and SRS transmission is made. I can.

Specifically, in the case of activation of a UL bandwidth part for SRS transmission, it may be defined to follow all UL bandwidth parts activated for PUCCH transmission or PUSCH transmission of the corresponding terminal. . That is, regardless of the activation method of the PUSCH/PUCCH bandwidth part defined in the NR, through all the UL bandwidth parts activated for PUCCH or PUSCH transmission in an arbitrary terminal It can be defined to enable SRS transmission in the corresponding terminal.

Specifically, a periodic or aperiodic SRS transmission resource configuration is made for all UL bandwidth parts configured for a certain terminal, and a random bandwidth part is At least, when activated for PUCCH or PUSCH transmission, it is possible to transmit a set or indicated periodic or aperiodic SRS through an activated UL bandwidth part. I can.

Or, regardless of the activation of the UL bandwidth part for PUCCH/PUSCH transmission, and without activation of a separate UL bandwidth part for SRS transmission, it is set for any terminal It can be defined to enable SRS transmission through all bandwidth parts.

Alternatively, a bandwidth part for SRS transmission, separate from the UL bandwidth part activated for the corresponding PUSCH/PUCCH transmission, is activated in the base station/network through MAC CE signaling or L1 control signaling. Can be defined to

Alternatively, in addition to the UL bandwidth part activated for PUSCH/PUCCH transmission, it may be defined to additionally set or activate a UL bandwidth part for SRS transmission only in the base station/network. That is, it is defined to support SRS transmission through a UL bandwidth part activated for PUSCH/PUCCH transmission in an arbitrary terminal, and activation for PUCCH/PUSCH transmission of the corresponding terminal in a base station/network In addition to the) UL bandwidth part, it may be defined to set or activate an additional UL bandwidth part capable of additionally transmitting SRS.

Or, regardless of the UL bandwidth part setting and activation for the corresponding PUSCH/PUCCH, the UL bandwidth part capable of transmitting SRS for each terminal or cell-specific in the base station/network ( The bandwidth part) may be defined to be separately configured through UE-specific higher layer signaling or cell-specific higher layer signaling.

In addition, when an aperiodic SRS transmission through a PDCCH is triggered by a certain terminal, the PDCCH includes indication information on a bandwidth part in which the aperiodic SRS transmission is performed. Can be defined.

In addition, in the case of activation of a UL bandwidth part for PRACH transmission, it is defined to follow all UL bandwidth parts activated for PUCCH transmission, PUSCH transmission, or SRS transmission of the corresponding terminal. can do. That is, regardless of the activation method of the PUSCH/PUCCH bandwidth part defined in the NR and the activation method of the bandwidth part for SRS transmission, PUCCH/PUSCH or For SRS transmission, it can be defined to enable PRACH transmission in the corresponding terminal through all UL bandwidth parts activated for SRS transmission.

Or, regardless of the activation of the UL bandwidth part for PUCCH/PUSCH or SRS transmission, it may be defined to enable PRACH transmission through all bandwidth parts configured for an arbitrary terminal. Or UE-specific higher layer signaling or cell of a UL bandwidth part capable of PRACH transmission for each UE or cell-specific in a base station/network -It can be defined to be separately configured through cell-specific higher layer signaling. Additionally, when PRACH transmission for a certain terminal is performed through a PDCCH, the corresponding PDCCH may be defined to include indication information on a bandwidth part in which PRACH transmission is performed.

Cross bandwidth part scheduling and multi-bandwidth parts scheduling

When a plurality of DL bandwidth parts or UL bandwidth parts are configured for each UE, the base station/network is configured for single bandwidth part scheduling or multi-bandwidth part scheduling. scheduling) can be defined.

Single bandwidth part scheduling is a PDSCH within one bandwidth part through one scheduling DCI (eg, downlink assignment DCI, UL grant, etc.) Alternatively, it may be defined as a scheduling method that restricts only PUSCH resource allocation. On the other hand, multi-bandwidth parts scheduling is one or more bandwidth parts through one scheduling DCI (e.g., DL assignment DCI, UL grant, etc.) It can be defined as a scheduling method that supports PDSCH or PUSCH resource allocation through.

In addition, when single bandwidth part scheduling is applied, semi-fixed between a DL bandwidth part in which the same scheduling DCI transmission is performed and a DL or UL bandwidth part in which PDSCH or PUSCH transmission is performed accordingly A linkage-based bandwidth part scheduling method in which a (semi-static) linkage is defined, and a different DL or a different DL through a scheduling DCI transmitted through an arbitrary DL bandwidth part. Cross bandwidth part scheduling that dynamically supports PDSCH or PUSCH transmission resource allocation through the UL bandwidth part can be defined, and this can be defined to be configured in the base station/network. .

The above-described configuration may be configured through higher layer signaling, or may be performed through MAC CE signaling or L1 signaling.

Cross bandwidth part scheduling

When a plurality of DL bandwidth parts are activated for an arbitrary UE, in particular, when a plurality of DL bandwidth parts for PDSCH transmission/reception are activated, PDSCH transmission for the corresponding UE It is necessary to define a linkage between a DL bandwidth part and a DL bandwidth part in which PDCCH transmission including scheduling control information for a corresponding PDSCH is performed.

This embodiment proposes a cross bandwidth part scheduling scheme in which PDSCH transmission for an arbitrary terminal and PDCCH transmission including scheduling control information for the corresponding PDSCH are performed through different bandwidth parts. do.

To this end, when setting a DL bandwidth part for an arbitrary UE in a base station/network, a bandwidth part indication field (BIF, Bandwidth part) for each DL bandwidth part through corresponding higher layer signaling Indication Field) value is set, or at the time of activation for an arbitrary DL bandwidth part, each of the respective activation signaling (eg, MAC CE signaling or L1 control signaling) It can be defined to set a BIF (Bandwidth Part Indication Field) value for each DL bandwidth part.

Likewise, for the UL bandwidth part, higher layer signaling when configuring a UL bandwidth part configured for each UL bandwidth part in the base station/network or for PUSCH or PUCCH transmission. By setting the BIF (Bandwidth Part Indication Field) value for each UL bandwidth part, or when activation of an arbitrary UL bandwidth part, corresponding activation signaling (e.g. For example, it may be defined to set a BIF (Bandwidth Part Indication Field) value for each UL bandwidth part through MAC CE signaling or L1 control signaling).

Accordingly, when cross bandwidth part scheduling is supported, a DL assignment DCI or UL grant for a corresponding terminal includes the aforementioned BIF indication information region. However, the cross bandwidth part scheduling can be defined to be configurable for each terminal by a base station/network through higher layer signaling and MAC CE signaling.In this case, cross bandwidth part scheduling ( Only when cross bandwidth part scheduling) is configured, the DL assignment DCI or UL grant for the corresponding terminal includes the aforementioned BIF indication information region.

If cross bandwidth part scheduling is not applied, a PDCCH including a DL assignment DCI and a PDSCH according thereto are transmitted through the same DL bandwidth part. . In addition, in the case of the UL bandwidth part, activation of the UL bandwidth part through higher layer signaling for setting each UL bandwidth part in the base station/network. ) Through MAC CE signaling or L1 control signaling for PUSCH transmission resource allocation information in a corresponding UL bandwidth part, that is, a DL bandwidth part in which transmission of a PDCCH including a UL grant is performed It can be defined to transmit indication information.

Or, on the contrary, through higher layer signaling for setting each DL bandwidth part (or a DL bandwidth part for PDCCH transmission) in the base station/network, or through a DL bandwidth part ) (Or DL bandwidth part for PDCCH transmission) for PUSCH or PUCCH or PRACH or SRS transmission for each DL bandwidth part through MAC CE signaling or L1 control signaling for activation It can be defined to transmit UL bandwidth part indication information that has been linked (linkage).

Specifically, the linkage indication information of the UL bandwidth part for each DL bandwidth part is PUSCH transmission indicated by a UL grant transmitted through each DL bandwidth part. This may be UL bandwidth part indication information and UL bandwidth part indication information in which transmission of UCI or PRACH or SRS triggered through the corresponding DL bandwidth part is performed.

Multi-bandwidth parts scheduling

Defined to support multi-bandwidth parts scheduling in which PDSCH or PUSCH transmission for an arbitrary terminal is performed through a plurality of DL bandwidth parts or a plurality of bandwidth parts, respectively, in the same time period. can do. The multi-bandwidth parts scheduling may be configured by the base station by UE-specific higher layer signaling or MAC CE signaling or L1 control signaling for each terminal. have.

Alternatively, multi-bandwidth parts scheduling is a plurality of DL bandwidth parts (or DL bandwidth parts for transmitting a plurality of PDSCHs) or a plurality of UL bandwidth parts, respectively, for an arbitrary terminal. When (bandwidth part) (or UL bandwidth part for transmission of a plurality of PUSCHs) is set or activated, it may be defined to be set to be implicit.

Accordingly, when multi-bandwidth parts scheduling is set in a certain UE, a DL assignment DCI or UL grant for the UE is configured or activated for transmission/reception of PDSCH or PUSCH ( It can be defined to include an indication information area based on a bitmap for each activated DL/UL bandwidth part. Bits constituting a bitmap for indicating the corresponding DL or UL bandwidth part are mapped 1:1 to one DL bandwidth part or UL bandwidth part, respectively, and the corresponding DL It is defined to indicate whether to allocate PDSCH or PUSCH resources through a bandwidth part or a UL bandwidth part.

Accordingly, a bitmap information region included in a DL assignment DCI or UL grant for an arbitrary UE in which a DL bandwidth part or UL bandwidth part is When indicated through, the frequency resource (PRB unit or RBG unit) allocation information region and time domain resource allocation information region of the corresponding downlink assignment DCI or UL grant are the indicated DL bandwidth It can be defined to be commonly applied in a part (bandwidth part) or a UL bandwidth part (bandwidth part).

Alternatively, the multi-bandwidth parts scheduling may be applied in the form of a bandwidth parts aggregation. That is, a plurality of DL bandwidth parts or a plurality of UL bandwidth parts among a plurality of DL bandwidth parts or a plurality of UL bandwidth parts configured for an arbitrary terminal Is activated, for a plurality of DL bandwidth parts or a plurality of UL bandwidth parts among the activated DL bandwidth part or UL bandwidth part Bandwidth parts aggregation can be defined to be configured by the base station/network.

In this case, the PRB assignment information area included in the downlink assignment DCI or UL grant for the corresponding UE is all the DL bandwidth parts or UL bandwidths for which the corresponding aggregation is set. It can be defined to be set by the base station and interpreted by the terminal based on the PRBs included in the part (bandwidth part).

At this time, one TB (in the case of single codeword scheduling) or two or more TBs (in the case of multiple codewords scheduling) allocated through one DCI is each assigned to the PRB assignment information. Accordingly, it may be transmitted over a corresponding plurality of DL or UL bandwidth parts. The corresponding bandwidth parts aggregation may be configured by the base station/network by UE-specific higher layer signaling, MAC CE signaling, or L1 control signaling.

In addition, when a bandwidth parts aggregation for a certain terminal is applied, the above-described for scheduling a PDSCH or PUSCH for the aggregated DL bandwidth part or UL bandwidth part A method of cross bandwidth part scheduling may be applied.

That is, a DL bandwidth part linkage in which PDSCH or PUSCH scheduling control information transmission for the aggregated DL bandwidth part or aggregated UL bandwidth part is performed. When information is set in the base station/network or when bandwidth parts aggregation is set, one BIF value for the aggregated bandwidth part is allocated by the base station/network, based on this As a result, the corresponding BIF value can be indicated through DCI.

Embodiment 1. Downlink bandwidth part switching (DL BWP (BandWidth Part) switching)

Specifically, as shown in FIG. 4 below, N downlink bandwidth parts (DL bandwidth part(s)) may be configured in an arbitrary serving cell configured for an arbitrary terminal. However, N is an arbitrary natural number, and the present invention is not limited by a specific N value. In addition, although FIG. 4 is configured not to overlap on the frequency axis between each BWP, the BWP may be configured to partially or entirely overlap on the frequency axis between any BWPs.

As described above, when N DL BWPs are configured for a corresponding terminal in an arbitrary serving cell configured for an arbitrary terminal, the DL BWP switching indication information for the corresponding terminal is scheduling downlink control information (scheduling DCI) as described above. Can be transmitted via

Specifically, DL BWP switching may be indicated through a downlink assignment DCI including resource allocation information for the PDSCH. To this end, the DL assignment DCI format configured to be monitored by an arbitrary terminal is a downlink bandwidth part indication field for DL BWP switching (in this embodiment, this is a DL BWP indication field for convenience of description). It may be referred to as BIF, but the present embodiment is not limited by its name.).

As a configuration method of the DL BIF, the DL BIF consists of a bitmap of N bits according to the number and N value of DL BWPs configured for a corresponding UE in an arbitrary serving cell as shown in FIG. It may be defined to transmit DL BWP activation (or DL BWP switching) indication information through an indication. Alternatively, as another configuration method of the DL BIF, the DL BIF may be defined to indicate an activated BWP index consisting of log ₂ (N) bits. Or, it is composed of log ₂ (N+1) bits to indicate the BWP index that is newly activated when switching BWP, and is non-switching (that is, the current active BWP is Maintenance) can be defined to include an indication (for example, when all log ₂ (N+1) bits are '0'). Or, according to the number of DL BWPs configured for the corresponding terminal, N, when N=<3, the BIF is configured with log ₂ (N+1) bits, and when N=4, it can be defined to consist of log ₂ (N) bits. have.

As another method of configuring the DL BIF, the DL BIF can be defined by an Nmax value, which is the maximum number of DL BWPs that can be set in an arbitrary serving cell, regardless of the actual number of DL BWPs set for each UE. For example, according to the Nmax value, the DL BIF is composed of a bitmap of Nmax bits to transmit DL BWP activation (or DL BWP switching) indication information through a bitmap-based indication. Can be defined. Alternatively, as another configuration method of the DL BIF, the DL BIF may be defined to indicate an activated BWP index consisting of log ₂ (Nmax) bits. Alternatively, the DL BIF consists of log ₂ (Nmax+1) bits, indicating a BWP index that is newly activated when switching BWP, as well as indicating non-switching (i.e., maintaining the current active BWP). It can be defined to include (indication) (for example, when log ₂ (N+1) bits are all '0').

However, whether the DL BIF is included in the DL assignment DCI format configured to be monitored by a certain UE may be implicitly or explicitly set by the base station/network. Specifically, as a (implicit) implicit configuration method, it may be defined to determine whether to include a DL BIF based on the number of DL BWPs configured in an arbitrary serving cell and an N value. For example, when the number of DL BWPs set for a certain terminal, N=1, the DL assignment DCI format set to monitor by the corresponding terminal does not include the DL BIF, and when N=>2, the corresponding terminal The DL assignment DCI format set for monitoring can be defined to include the DL BIF. Alternatively, it may be defined to determine whether to include a DL BIF based on a DL assignment DCI format or a DL assignment DCI size. That is, for a terminal in which one or more bandwidth parts are configured, it can be defined to include DL BIF only for DCI format 1_1 among DCI format 1_0 and DCI format 1_1, which are DCI formats that the corresponding terminal must monitor to receive PDSCH scheduling control information. . Alternatively, it can be defined to determine whether to include a DL BIF for each search space monitored by the corresponding terminal (for example, a common search space vs. a UE-specific search space, or a search space composed of PDCCH candidates of an arbitrary aggregation level or higher). .

Alternatively, as an explicit configuration method, UE-specific RRC signaling by setting whether to include DL BIF for each UE in the base station/network or for each DL assignment DCI format configured to be monitored by each UE. Can be defined to be transmitted via Or set whether to include a DL BIF for each CORESET set for a certain terminal, or a search space (e.g., a common search space vs. a UE-specific search space, or a search space composed of PDCCH candidates of a certain aggregation level or higher) ) Can be defined to be transmitted through UE-specific RRC signaling by setting whether to include a DL BIF for each. Alternatively, whether to include the DL BIF may be set as a combination of the above-described implicit or explicit setting methods.

If the DL BIF is implicitly or explicitly set by the base station/network for any DL assignment DCI format configured to be monitored by a certain UE, the DL does not include the DL BIF. The PDSCH resource allocation information through the assignment DCI format may be interpreted by the UE as PDSCH resource allocation information in the same DL BWP as the DL BWP through which the corresponding DL assignment DCI is transmitted.

Additionally, DL BWP switching through DCI that does not include scheduling information for the PDSCH may be supported. In this case, the corresponding DL BWP switching may be indicated by the base station/network through the DL assignment DCI format including the DL BIF or through the same DCI size transmission as the corresponding DCI format. For example, for a DL assignment DCI format including a DL BIF defined to be monitored by a certain UE, when the DL assignment DCI format is used only for DL BWP switching without PDSCH scheduling, the DL assignment DCI format is configured. DL assignment DCI by setting all or some information areas (eg, MCS field and/or PRB allocation field, etc.) to a specific value (eg, all '0') of the information areas except for the DL BIF May be defined to be interpreted by the UE as only for DL BWP switching that does not include scheduling information for the PDSCH.

Alternatively, in defining the DL assignment DCI format, a separate information area for indicating the use of the DCI may be defined, and it may be defined to be included in the downlink assignment DCI format. The information region for indicating the use of the DCI is an information region for indicating whether to schedule PDSCH (e.g., a 1-bit indication field for indicating with or without PDSCH scheduling information. field)) or an information area for indicating whether to switch DL BWP (for example, a 1-bit indication field for indicating DL BWP switching or non-switching), Alternatively, it may be defined to include both of the above information in a joint encoded or separate encoded manner. For example, it may be an information region for indicating DL BWP switching with PDSCH scheduling or DL BWP switching without PDSCH scheduling with PDSCH scheduling. Alternatively, it may be an information area for indicating one of three states including PDSCH scheduling without DL BWP switching in the above two states.

Hereinafter, a specific time related to downlink bandwidth part switching (DL BWP switching) will be described.

As described above, when DL BWP switching is instructed through DL assignment DCI, the time at which the currently activated DL BWP is deactivated and the DL BWP indicated through the DL assignment DCI is activated. Need to define In particular, in the case of DL BWP switching, it is necessary to minimize the ambiguity of the BWP switching timing between the UE and the base station for transmitting and receiving the PDCCH. In this embodiment, the following three methods are proposed for defining DL BWP switching timing for this purpose.

1.PDCCH reception timing based approach

When downlink bandwidth part switching (DL BWP switching) for a certain terminal is indicated through DCI by the above-described methods, the terminal and the base station are based on a slot in which transmission and reception of the PDCCH including DCI is performed. As a result, the downlink bandwidth part switching time of the terminal (DL BWP switching time) can be derived. That is, when DL BWP switching is instructed through a DL assignment DCI in an n-th slot #n (however, as described above, the corresponding DL assignment DCI may not include PDSCH scheduling control information), from slot #n From slot #(n+k) after the k slot, the existing DL BWP may be deactivated, and a new DL BWP indicated by the DL assignment DCI may be activated.

According to an example, the k value may be set by the base station/network and transmitted through UE-specific higher layer signaling. Alternatively, the k value may be transmitted through L1 control signaling (eg, DCI transmitting corresponding DL BWP switching indication information). Alternatively, the k value may have an arbitrary fixed value, or may be determined by the capability of the terminal. However, when the bandwidth part transition time (BWP transition time) is determined by the capability of the terminal, each terminal may report a corresponding capability value for setting the BWP transition time to the network.

In addition, contrary to the above, the UE may not receive the PDCCH or PDSCH through the existing DL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether the PDCCH or PDSCH can be received through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be set by UE capability. In this case, also, the terminal may report the capability to the network.

In addition, when the BWP switching time is determined by the terminal capability, a timing gap between the DCI reception time indicated by the time domain resource assignment information indicated by the DCI and the PDSCH reception time according thereto If (e.g., the k0 value) does not guarantee the BWP switch time-related capability indicated by the terminal, that is, if the k0 value is less than the BWP switch time related capability indicated by the UE, the UE BWP switching according to the instruction may not be performed.

2. Scheduled PDSCH reception timing based approach

When a downlink bandwidth part switching (DL BWP switching) for an arbitrary terminal is instructed through a downlink assignment DCI according to the above-described methods, the terminal and the base station are indicated through the corresponding DL assignment DCI or The DL BWP switching time of the corresponding terminal may be derived based on the PDSCH transmission time set through RRC signaling. That is, when DL BWP switching is instructed through a DL BIF included in a DL assignment DCI including PDSCH scheduling control information for an arbitrary terminal, a PDSCH transmission/reception slot indicated by the corresponding DL assignment DCI or configured through RRC signaling The DL BWP switching time may be defined based on (slot) (however, when PDSCH resources are allocated for a plurality of slots through the corresponding DL assignment DCI, the first slot in which PDSCH transmission/reception starts accordingly).

Specifically, time domain PDSCH resource allocation information transmitted through DL assignment DCI from any terminal that has received the DL assignment DCI through a random n-th slot #n (for example, timing gap between DL assignment DCI and PDSCH transmission/reception. gap) setting information) or when the PDSCH transmission slot according to the timing relationship setting information between the DL assignment set by RRC signaling and the PDSCH transmission accordingly is slot #(n+k1), the PDSCH transmission slot is slot #( DL BWP switching may be performed in slot # (n+k1-k2) before any k2 slot based on n+k1). For example, when k2 = 0, the existing DL BWP from the PDSCH transmission slot may be deactivated, and a new DL BWP indicated by the DL assignment DCI may be defined to be activated.

However, the k2 value is set by the base station/network and transmitted through UE-specific higher layer signaling, or L1 control signaling (e.g., DCI transmitting the corresponding DL BWP switching indication information). ), or has an arbitrary fixed value, or may be determined by the capability of the terminal. However, when the BWP switch time is determined by the capability of the UE, each UE may report a capability value for setting the BWP switch time to the network.

In addition, contrary to the above, the terminal defines not to receive the PDCCH or PDSCH through the existing DL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time, or the PDCCH through the existing BWP during the BWP switching time. Alternatively, whether the PDSCH can be received is set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or is defined by the terminal capability, and this can also be reported by the terminal to the network.

3. UE's HARQ ACK/NACK feedback timing based approach

When downlink bandwidth part switching (DL BWP switching) for a certain terminal is indicated through DCI by the above-described methods, the corresponding terminal and the base station are the PDSCH of the terminal indicated through DL assignment DCI or set through RRC signaling. A downlink bandwidth part switching time (DL BWP switching time) of the corresponding terminal may be derived based on the HARQ ACK/NACK feedback time for reception. In this case, the HARQ ACK/NACK feedback of the corresponding terminal may also be used for confirmation of the DL BWP switching instruction through the DL assignment DCI of the base station. Specifically, when DL BWP switching is indicated by the DL assignment DCI including PDSCH scheduling control information for an arbitrary UE as described above, a PUCCH transmission slot for HARQ ACK/NACK feedback of the UE indicated by the DL assignment DCI ( However, when a plurality of slot-based PUCCH transmissions are configured or indicated in the corresponding terminal, the DL BWP switching time may be defined based on the last PUCCH transmission slot).

Specifically, time domain PDSCH resource allocation information (e.g., DL assignment DCI and time domain PDSCH resource allocation information set through RRC signaling or indicated through DL assignment DCI in any terminal that has received the DL assignment DCI through an n-th slot #n) The PDSCH transmission slot according to the timing gap setting information between PDSCH transmission and reception is slot #(n+k3), and time domain PUCCH resource allocation information for HARQ ACK/NACK feedback transmission of the terminal (e.g., When the PUCCH transmission slot according to the timing gap setting information between the UE's PDSCH reception and the corresponding UE's HARQ ACK/NACK feedback) is slot #(n+k3+k4), based on slot #(n+k3+k4) As such, DL BWP switching may be performed in slot #(n+k3+k4+k5) after the k5 slot. For example, in the case of k5 = 1, the existing DL BWP is deactivated from the next slot of the slot where the HARQ ACK/NACK feedback of the terminal is made, and the new DL BWP indicated by the DL assignment DCI is activated. I can.

However, the k5 value is set by the base station/network and transmitted through UE-specific higher layer signaling, or L1 control signaling (e.g., DCI transmitting the corresponding DL BWP switching indication information). ), or has an arbitrary fixed value, or may be determined by the capability of the terminal. However, when the BWP switching time is determined by the capability of the terminal, each terminal may report a capability value for setting the BWP switching time to the network.

In addition, contrary to the above, the terminal defines not to receive the PDCCH or PDSCH through the existing DL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time, or the PDCCH through the existing BWP during the BWP switching time. Alternatively, whether or not the PDSCH can be received is set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or is determined by the terminal capability, and this can also be reported by the terminal to the network.

However, if the DL assignment DCI does not include PDSCH scheduling control information, the UE calculates the PUCCH transmission time from the DCI reception time including only the DL BWP switching information (i.e., the PDSCH reception slot set by DCI or RRC signaling. In applying timing gap information between PUCCH/PUSCH transmission slots including HARQ ACK/NACK feedback information corresponding thereto, timing gap information from a DCI reception time including DL BWP switching information rather than a PDSCH transmission time By applying the PUCCH transmission time), HARQ ACK feedback may be performed, and a DL BWP switching slot may be determined based on the HARQ ACK feedback application slot. Likewise, when receiving the BWP activation/deactivation indication information excluding the scheduling control information, that is, the DL DCI including only the active BWP switching indication information, the UE according to the aforementioned HARQ ACK/NACK feedback timing HARQ ACK feedback may be performed, and BWP switching may be performed according to the aforementioned PDCCH reception timing-based approach or a scheduled PDSCH reception timing-based approach.

Additionally, transmission of a DL assignment DCI and a PDSCH corresponding thereto may be restricted to be performed in the same DL BWP. That is, the DL BIF information included in the DL assignment DCI is only interpreted for the DL BWP switching indication in the corresponding terminal, and the PDSCH resource allocation information included in the DL assignment DCI is interpreted as the PDSCH resource allocation in the DL BWP through which the DL assignment DCI was transmitted. Can be defined to

Embodiment 2. Uplink bandwidth part switching (UL BWP (BandWidth Part) switching)

Similar to the above-described DL BWP configuration, similar to FIG. 4, M uplink bandwidth parts (UL bandwidth part(s)) may be configured in an arbitrary serving cell configured for an arbitrary terminal. However, M is an arbitrary natural number, and the present invention is not limited by a specific M value, and N, which is the number of DL BWPs, and M, which is the number of UL BWPs, set in an arbitrary terminal may be the same or different. In addition, although FIG. 4 is configured not to overlap on the frequency axis between each BWP, the BWP may be configured to partially or entirely overlap on the frequency axis between any BWPs.

As described above, when M UL BWPs are configured for a corresponding terminal in a serving cell configured for an arbitrary terminal, UL BWP switching indication information for the corresponding terminal may be transmitted through scheduling DCI as described above.

Specifically, UL BWP switching may be indicated through an UL grant DCI including resource allocation information for PUSCH. To this end, the DL assignment DCI format configured to be monitored by an arbitrary terminal is an UL BWP indication field for UL BWP switching (in this embodiment, this is UL BWP indication field for convenience of description). It may be referred to as BIF, but the present embodiment is not limited by its name.). Alternatively, UL BWP switching may be indicated through DL assignment DCI including resource allocation information for PDSCH. In this case, when configuring PUCCH resource allocation information for HARQ ACK/NACK feedback of the terminal for the PDSCH, it may be defined to include the UL BIF.

As a configuration method of the UL BIF, the UL BIF is composed of a bitmap of M bits according to the number and M value of UL BWPs configured for the corresponding terminal in a serving cell, and is a bitmap-based indication. ) Can be defined to transmit UL BWP activation (or switching) indication information. Alternatively, as another method of configuring the UL BIF, the UL BIF may be defined to indicate an activated UL BWP index consisting of log ₂ (M) bits. Alternatively, it is composed of log ₂ (M+1) bits to indicate the UL BWP index that is newly activated when switching the UL BWP, as well as non-switching (i.e., the current active UL BWP). Maintenance) can be defined to include an indication (for example, when all of the log ₂ (M+1) bits are '0'). Alternatively, according to the number of UL BWPs configured for the corresponding terminal, M may be defined to consist of log ₂ (N+1) bits when M=<3, and log ₂ (N) bits when M=4. .

As another method of configuring the UL BIF, the UL BIF may be defined by an Mmax value, which is the maximum number of UL BIFs that can be set in an arbitrary serving cell, regardless of the actual number of UL BIFs set for each UE. For example, according to the Mmax value, the UL BIF may be defined to transmit UL BWP activation (or UL BWP switching) indication information through a bitmap-based indication, configured as a bitmap of Mmax bits. . Alternatively, as another configuration method of the UL BIF, the UL BIF may be defined to indicate an activated BWP index consisting of log ₂ (Mmax) bits. Or, it is composed of log ₂ (Mmax+1) bits to indicate the BWP index that is newly activated when switching BWP, as well as to non-switching (i.e., maintaining the current active BWP). It can be defined to include an indication for (for example, when all log2(N+1) bits are '0').

However, whether the UL BIF is included in the UL grant DCI format configured to be monitored by an arbitrary terminal may be set implicitly or explicitly by the base station/network. . Specifically, as an implicit setting method, whether to include the UL BIF may be determined based on the number of UL BWPs and M values configured in a serving cell. For example, when the number of UL BWPs configured for an arbitrary terminal, M=1, the UL grant DCI format configured to be monitored by the corresponding terminal does not include the UL BIF, and when N=>2, the corresponding terminal The UL grant DCI format configured to be monitored may include UL BIF.

Alternatively, whether to include the UL BIF may be determined by the type/type of the UL grant DCI format or the UL grant DCI size. That is, for a UE in which one or more bandwidth parts are configured, UL BIF may be included only for DCI format 0_1 among DCI format 0_0 and DCI format 0_1, which are DCI formats that the UE must monitor in order to receive PUSCH scheduling control information. Alternatively, it may be determined whether to include the UL BIF for each search space monitored by the corresponding terminal (eg, a common search space vs. a UE-specific search space, or a search space composed of PDCCH candidates of an arbitrary aggregation level or higher).

Alternatively, as an explicit configuration method, whether to include the UL BIF for each terminal in the base station/network or for each UL grant DCI format configured to be monitored by each terminal may be set and transmitted through UE-specific RRC signaling. Or, set whether to include UL BIF for each CORESET configured for a certain terminal, or a search space (e.g., Common Search Space vs. UE-specific Search Space, or a search space composed of PDCCH candidates of a certain aggregation level or higher, etc. ) It is possible to set whether to include the UL BIF for each and transmit it through UE-specific RRC signaling. Alternatively, whether to include the UL BIF may be set as a combination of the above-described implicit or explicit setting methods.

As such, when the inclusion of UL BIF for any UL grant DCI format configured to be monitored by any terminal is implicitly or explicitly set by the base station/network, UL grant DCI not including UL BIF The PUSCH resource allocation information through the format may be interpreted by the UE as PUSCH resource allocation information through the UL BWP, which is active in the slot in which the UL grant DCI is received. Alternatively, it may be interpreted by the UE as PUSCH resource allocation information through UL BWP, which is an active state in a PUSCH transmission slot through UL grant. Specifically, UL BWP switching may be indicated between a UL grant DCI transmission slot and a PUSCH transmission slot by UL grant DCI. In this case, the UE interprets the PUSCH resource allocation information of the UL grant DCI as a PUSCH transmission resource in the UL BWP that is active at the UL grant DCI reception time/slot, and transmits the PUSCH accordingly, or The PUSCH transmission time/slot according to the UL grant DCI may be reinterpreted as a PUSCH transmission resource in an active UL BWP, and the PUSCH may be transmitted accordingly.

Additionally, UL BWP switching through DCI that does not include scheduling information for PUSCH may be supported. In this case, UL BWP switching may be indicated by the base station/network through the UL grant DCI format including the UL BIF or through the same DCI size transmission as the UL grant DCI format. For example, for any UL grant DCI format including UL BIF defined to be monitored by any terminal, when the UL grant DCI format is used only for UL BWP switching without PUSCH scheduling, configuring the UL grant DCI format By setting all or some of the information areas (eg, MCS field and/or PRB allocation field, etc.) to a specific value (eg, all '0') of the information areas except for the UL BIF, UL The grant DCI is only for UL BWP switching that does not include scheduling information for the PUSCH, and can be defined to be interpreted by the UE.

Alternatively, in defining the UL grant DCI format, a separate information area for indicating the use of the DCI may be defined and defined to include this in the UL grant DCI format. The information area for indicating the use of the DCI is an information area for indicating whether or not to schedule PUSCH (eg, a 1-bit indication field for indicating including or not including PUSCH scheduling information) Or an information area for indicating whether to switch UL BWP (for example, a 1-bit indication field for indicating UL BWP switching or non-switching), or the two pieces of information It can be defined to include both jointly encoded or separate encoded. For example, it may be an information region for indicating one of UL BWP switching with PUSCH scheduling or UL BWP switching without PDSCH scheduling with PUSCH. Alternatively, it may be an information area for indicating one of three states, including PUSCH scheduling without UL BWP switching in the above two states.

Hereinafter, a specific time point related to UL BWP switching will be described.

As described above, when UL BWP switching is instructed through UL grant DCI, it is necessary to define a time point for deactivating the UL BWP that is currently activated and activating the indicated UL BWP. Do.

1.PDCCH reception timing based approach

When UL BWP switching is indicated for an arbitrary UE through the DCI by the above-described methods, the UE and the base station specify a slot in which transmission/reception for the PDCCH including the DCI is performed. Based on this, it can be defined to derive the UL BWP switching time of the UE. That is, when UL BWP switching is indicated through UL grant DCI (however, UL grant DCI may not include PUSCH scheduling control information as described above) in any nth slot #n, j from slot #n From slot #(n+j) after the slot, the existing UL BWP may be deactivated, and a new UL BWP indicated by the UL grant DCI may be activated. Here, the value j may be set by the base station/network and transmitted through UE-specific higher layer signaling. Alternatively, the j value may be transmitted through L1 control signaling (eg, DCI transmitting UL BWP switching indication information). Alternatively, the j value may have a fixed value or may be determined by the capability of the terminal. However, when the bandwidth part transition time (BWP transition time) is determined by the capability of the terminal, each terminal may report a capability value for setting the BWP transition time to the network.

In addition, contrary to the above, the UE may not transmit PUSCH or PUCCH through the existing UL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether PUSCH or PUCCH can be transmitted through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be determined by UE capability. This also allows the UE to report the capability to the network.

In addition, when the BWP switching time is determined by the terminal capability, a timing gap between the DCI reception time indicated by the time domain resource assignment information indicated by the DCI and the PUSCH transmission time accordingly (e.g. For example, if k2 value) does not guarantee the BWP switch time related capability indicated by the terminal, that is, if the k2 value is less than the BWP switch time related capability indicated by the UE, the UE BWP switching according to the instruction may not be performed.

2. Scheduled PUSCH transmission timing based approach

When UL BWP switching is indicated for a UE through an uplink grant DCI according to the above-described methods, the UE and the base station are PUSCH transmission time indicated through UL grant DCI or set through RRC signaling. Based on the UL BWP switching time (switching time) of the terminal can be derived. That is, when UL BWP switching is indicated through the UL BIF of the UL grant DCI including PUSCH scheduling control information for an arbitrary UE, a PUSCH transmission/reception slot indicated by UL grant DCI or configured through RRC signaling (however, When PUSCH resource allocation for a plurality of slots is made through UL grant DCI, the UL BWP switching time may be determined based on (the first slot in which PUSCH transmission/reception starts).

Specifically, time domain PUSCH resource allocation information transmitted through UL grant DCI from any terminal that has received the UL grant DCI through any n-th slot #n (e.g., timing gap between UL grant and PUSCH transmission/reception) ) Configuration information) or a PUSCH transmission slot according to the timing relationship configuration information between the UL grant configured by RRC signaling and the PUSCH transmission accordingly, slot #(n+j1), which is a PUSCH transmission slot, slot #(n On the basis of +j1), the corresponding DL BWP switching may be performed in slot # (n+j1-j2) before any j2 slot. For example, when j2=0, the existing UL BWP may be deactivated from the PUSCH transmission slot, and a new UL BWP indicated by the UL grant DCI may be activated. In this case, the PUSCH resource allocation information according to the UL grant may be interpreted as PUSCH resource allocation information in the newly activated UL BWP.

Alternatively, on the contrary, UL BWP switching may be performed in slot #(n+j1+j2) after an arbitrary j2 slot based on slot #(n+j1) which is a PUSCH transmission slot. For example, when j2=1, UL BWP switching may be performed in a slot next to a slot in which PUSCH transmission is performed. In this case, the PUSCH transmission resource allocation information through the UL grant can be interpreted by the terminal based on the existing UL BWP, and the base station confirms whether the terminal receives the UL BWP switching information through PUSCH reception through the existing UL BWP. )can do. However, in this case, when PUSCH transmission resources are allocated through a plurality of slots through the UL grant, slot #(n+j1) may be defined as the last slot in which PUSCH transmission is performed, contrary to the above.

In addition, the j2 value is set by the base station/network and transmitted through UE-specific higher layer signaling, or through L1 control signaling (eg, DCI transmitting the corresponding DL BWP switching indication information), or It may have a fixed value of or may be determined by the capability of the terminal. However, when the BWP switching time is determined by the capability of the terminal, each terminal may report a capability value for setting the BWP switching time to the network.

In addition, contrary to the above, the UE may not transmit PUSCH or PUCCH through the existing UL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether PUSCH or PUCCH can be transmitted through the existing BWP during the BWP switching time is set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or is determined by the terminal capability, and this is also determined by the UE You can report over the network.

In addition, even when the association between DL BWP and UL BWP is made 1:1, DL BWP or UL BWP switching is respectively indicated through DL assignment DCI or UL grant DCI according to the above-described method, and DL BWP switching accordingly Time and UL BWP switching time may be applied. However, in this case, the associated DL BWP or UL BWP switching may be performed in the same manner. That is, when DL BWP switching is indicated by the DL assignment DCI, the DL BWP switching time is defined by the above-described method, and accordingly, not only DL BWP switching but also UL BWP switching associated with DL BWP is performed. On the contrary, when UL BWP switching is indicated by the UL grant, the UL BWP switching time is defined by the above-described method, and accordingly, not only UL BWP switching but also associated DL BWP switching may be defined.

However, the aforementioned BWP transition time may be referred to as other terms such as BWP switching delay, and the present embodiment is not limited by the name.

In Embodiments 1 and 2 according to the present specification described above, in order to switch the bandwidth part used between the UE and the base station, the UE transmits the capability value of the UE to the base station, and according to the capability value of the UE. It is assumed that a BIF indicating a new bandwidth part to be activated is received from a base station and a data channel is transmitted/received through a bandwidth part activated by the BIF.

In the above-described embodiments 1 and 2, a technical idea is described based on two nodes of a terminal and a base station, but this is only for convenience of understanding, and the same technical idea may be applied between the terminal and the terminal. That is, the present technical idea may be applied to not only communication between a terminal and a base station, but also communication between terminals (Device to Device), side link communication (Sidelink), vehicle communication (V2X), and the like. In particular, it can be applied to communication between terminals in the next-generation radio access technology, and terms such as signals and channels in the present specification can be variously modified and applied according to the type of communication between terminals.

Therefore, the terminal according to the present specification transmits a capacity value of the terminal to another terminal and indicates a bandwidth part to be newly activated according to the capacity value of the terminal in order to switch the bandwidth part used between the terminal and another terminal. By receiving the BIF from another terminal, it is possible to transmit and receive a data channel with another terminal through a bandwidth part activated by the BIF.

5 is a diagram illustrating a procedure for a terminal to switch a bandwidth part by reflecting a traffic load of a terminal in the present embodiment.

Referring to FIG. 5, the terminal may transmit physical layer capability information including bandwidth part (BWP) switching delay type information (S500).

The terminal may receive bandwidth part (BWP) configuration information from the base station. The terminal may receive BWP configuration information from the base station through higher layer signaling (eg, RRC signaling). The BWP configuration information is information on a bandwidth part set including one or more bandwidth parts configured for the terminal. According to an example, the BWP configuration information may include index information indicating each bandwidth part of the bandwidth part set. As another example, the BWP part configuration information may additionally include subcarrier spacing (SCS) information and a cyclic prefix (CP) for each bandwidth part of the aforementioned bandwidth part set.

Each bandwidth part of the bandwidth part set may be configured by common resource block indexing information on a component carrier configured by the base station. Here, the component carrier may be a narrowband (NB) or wideband (WB) component carrier, and may refer to one or more component carriers constituting carrier aggregation (CA).

Specifically, the configuration information for each bandwidth part of the aforementioned bandwidth part may include a starting RB index based on the aforementioned common resource block indexing information, that is, a starting point of the bandwidth part. The starting physical resource block index may be expressed in units of RB indexes based on common resource block indexing. Further, the configuration information for each bandwidth part may additionally include start resource block index information based on the common resource block indexing information and size information of a corresponding bandwidth part.

A downlink data channel or an uplink data channel may be transmitted or received between the terminal and the base station through any one of the bandwidth parts included in the bandwidth part set configured in the terminal according to the received bandwidth part setting information. In this case, if necessary, the bandwidth part being used for transmission or reception of the data channel may be switched to another bandwidth part included in the same bandwidth part set.

Among the DL bandwidth parts configured in the terminal, one initial DL bandwidth part for monitoring CORESET in a common search space of the Type0-PDCCH may be configured. In addition, one initial UL bandwidth part for random access among the UL bandwidth parts configured in the terminal may be configured.

According to an example, the first DL bandwidth part and the first UL bandwidth part may be determined based on frequency information of the detected SS block when the terminal detects an SS block transmitted from the base station. have. In the initial access step, the first DL bandwidth part and UL bandwidth part are activated, and after the DL bandwidth part and UL bandwidth part for the terminal are set, a downlink data channel is received from the base station or uplink data to the base station. The bandwidth part for transmitting the channel can be switched.

According to an example, a bandwidth part switching delay (BWP switching delay), which is a time taken to switch a bandwidth part being used for transmitting and receiving a data channel to another bandwidth part, may be determined by the capability of the terminal. Depending on the capabilities of the terminal, the terminal may be classified as one of a predetermined bandwidth part switching delay type classified into at least two or more types. For effective switching of the bandwidth part, the terminal may transmit physical layer capability information including switching delay type information determined by the capability of the terminal to the base station.

That is, when downlink bandwidth part switching (DL BWP switching) is instructed through DCI, the terminal downlink bandwidth part switching time (DL BWP switching time) of the terminal based on the slot in which the PDCCH including the DCI was received. Can be derived. According to an example, the switching delay type of the terminal may be determined according to the derived bandwidth part switching time.

For example, a PDCCH including a DCI is received in an n-th slot, and in the (n+k)-th slot where k slots have elapsed, the existing active DL BWP is deactivated and the DL assignment DCI It is assumed that a new DL BWP indicated by is activated. In this case, according to an example, the BWP transition time k required to switch the downlink bandwidth part may be determined by the capability of the terminal.

In this way, when the BWP switching time is determined by the capacity of the terminal, the terminal may be configured to transmit a capability value of the terminal for the BWP switching time to the base station.

In the above, it has been described that the capability value of the terminal is transmitted to the base station in order to switch the bandwidth part used for communication between the terminal and the base station, but the present invention is not limited thereto. According to an example, the terminal may transmit a capability value of the terminal to another terminal in order to switch a bandwidth part used for communication with another terminal.

Again, referring to FIG. 5, the terminal may receive downlink control information including a bandwidth part indication field determined by reflecting the traffic load of the terminal and scheduling information for a data channel (S510).

The terminal may receive a downlink data channel from the base station or transmit an uplink data channel to the base station through one bandwidth part indicated by the downlink control information (DCI) received from the base station. According to an example, only one bandwidth part indicated by a bandwidth part indicator field (BIF) may be set at a specific time step. According to an example, the number of DL bandwidth parts and the number of UL bandwidth parts that can be used by the terminal may be set up to N (N is a natural number of 1 or more), respectively. However, this is an example, and the number of DL bandwidth parts and the number of UL bandwidth parts may be differently set.

A BIF indicating a bandwidth part to be used for transmission and reception of a data channel among bandwidth parts included in a bandwidth part set configured in the terminal may be transmitted through scheduling DCI.

According to an example, downlink BWP switching may be indicated through a downlink assignment DCI including resource allocation information for a downlink data channel (PDSCH). In this case, the downlink assignment DCI format configured to be monitored by the terminal may include a downlink bandwidth part indication field (DL BIF) for downlink bandwidth part switching.

Whether to include the DL BIF may be determined by the downlink allocation DCI format. That is, for a terminal in which one or more bandwidth parts are configured, DL BIF may be included only for DCI format 1_1 among DCI format 1_0 and DCI format 1_1, which are DCI formats that the corresponding terminal must monitor to receive PDSCH scheduling control information. Referring to FIG. 9, it is shown that scheduling information for DL BIF and PDSCH is included in DCI format 1_1.

Alternatively, uplink bandwidth part switching may be indicated through an UL grant DCI including resource allocation information for PUSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include an uplink bandwidth part indication field (UL BIF) for uplink bandwidth part switching.

Whether to include the UL BIF may be determined by the UL grant DCI format. In other words, UL BIF only for DCI format 0_1 among DCI format 0_0 and DCI format 0_1, which are DCI formats that the UE must monitor to receive uplink data channel (PUSCH) scheduling control information for a UE configured with one or more bandwidth parts. May be included. Referring to FIG. 10, it is shown that scheduling information for UL BIF and uplink data channels is included in DCI format 0_1.

9 and 10 illustrate a case in which scheduling information is included in downlink control information (DCI), but is not limited thereto. According to an example, DL BWP switching through DCI that does not include scheduling information for the PDSCH may be supported. For example, when the DL assignment DCI format is used only for DL BWP switching without PDSCH scheduling, all or part of the information areas other than the DL BIF among the information areas constituting the DL assignment DCI format (e.g., MCS field and/or PRB allocation field, etc.) may be set to a specific value (eg, '0'). Likewise, when the UL grant DCI format is used only for UL BWP switching without PUSCH scheduling, all or part of the information regions other than UL BIF among the information regions configuring the UL grant DCI format (e.g., MCS field and /or PRB allocation field, etc.) may be set to a specific value (eg, '0').

According to an example, the bandwidth part indication field (BIF) may be determined according to a value of N, which is the number of bandwidth parts included in a bandwidth part set configured for a terminal in a serving cell as shown in FIG. 4. The BIF is composed of log ₂ (N) bits and may indicate the index (index, 00, 01, 10, 11) of the BWP that is activated. Alternatively, the BIF is composed of log ₂ (N+1) bits and indicates not only the BWP index that is newly activated when switching BWP, but also indicates that the current active BWP is maintained. ) (For example, when log ₂ (N+1) bits are all '0').

Or, if the number of bandwidth parts configured for the terminal is less than or equal to 3 (N=<3), the BIF consists of log ₂ (N+1) bits, and the number of bandwidth parts is 4 (N=4) , BIF may be composed of log ₂ (N) bits. That is, when N is 1, it may consist of 1 bit, when N is 2, 2 bits, when N is 3, 2 bits, and when N is 4, it may consist of 2 bits.

According to an embodiment, the bandwidth part indicated according to the value of the BIF may be determined by reflecting the uplink and downlink traffic loads for the terminal during data channel transmission and reception. If the power consumption in the case of using the other bandwidth part in the inactive state is less than the power consumption according to the active bandwidth part between the terminal and the base station, the terminal may receive a DCI indicating switching of the bandwidth part to another bandwidth part from the base station. I can.

According to an example, the load when transmitting and receiving a data channel may be determined based on a state of a terminal or a state of a downlink data channel and an uplink data channel. As shown in FIG. 4, when N bandwidth parts having various bandwidths are configured for the terminal, the terminal or the base station may switch to an appropriate bandwidth part according to the traffic load of the terminal at an arbitrary point in time. At that time, the bandwidth part having the least power consumption may be selectively used, and thus power consumption due to maintaining unnecessary broadband-based bandwidth may be reduced.

For example, when the power consumption according to the currently used bandwidth part is greater than a predetermined reference value, the terminal or the base station may check the power consumption according to other bandwidth parts. If it is determined that the amount of power consumption according to the other bandwidth part is smaller, information indicating the corresponding bandwidth part may be included in the DCI. However, this is an example, and if it is possible to determine the power consumption for each bandwidth part, it will not be limited to a specific method.

In the above, it has been described that the terminal receives the BIF indicating the bandwidth part to be activated newly from the base station in order to switch the bandwidth part, but is not limited thereto. According to an example, the terminal may receive a BIF indicating a bandwidth part to be newly activated from another terminal that has transmitted the capability value of the terminal.

Again, referring to FIG. 5, the terminal activates the bandwidth part indicated according to the BIF value in consideration of the transition time determined according to the bandwidth part switching delay type information (S520), and data according to the scheduling information. Channels can be transmitted and received (S530).

When the DL bandwidth part switching for the UE is instructed through DCI, the UE may derive the DL BWP switching time of the UE based on the slot in which the PDCCH including DCI is received. Referring to FIG. 11, the UE deactivates the existing DL BWP from k slots after the slot in which the PDCCH is received, and activates a new DL BWP indicated by the bandwidth part indication field included in the DL assignment DCI. can do. The BWP switching time, that is, the BWP transition time k, may be determined by the capability of the terminal.

In addition, the terminal may be configured not to receive the PDCCH or PDSCH through the existing DL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether the PDCCH or PDSCH can be received through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be determined by UE capability.

In addition, when the BWP switching time is determined by the terminal capability, a timing gap between the DCI reception time indicated by the time domain resource assignment information, which is scheduling information included in the DCI, and the data channel reception time. gap) (eg, k0 value) does not guarantee the BWP switching time-related capability indicated by the UE, the UE may not perform BWP switching according to the DCI indication. In this case, according to an example, the terminal may transmit and receive a data channel from a point in time when a k0 slot determined as scheduling information has elapsed while maintaining the previous bandwidth part, as shown in FIG. 12.

According to another example, time domain PDSCH resource allocation information transmitted through DL assignment DCI from a terminal receiving a DL assignment DCI through an n-th slot (for example, timing gap between DL assignment DCI and PDSCH transmission/reception) gap) configuration information) or a PDSCH transmission slot according to the timing relationship configuration information between DL assignment set by RRC signaling and PDSCH transmission accordingly, if the PDSCH transmission slot is an n+k1 slot, an arbitrary k2 based on the n+k1 slot DL BWP switching may be performed in the n+k1-k2 slot before the slot. For example, when k2 = 0, the existing DL BWP from the PDSCH transmission slot may be deactivated, and a new DL BWP indicated by the DL assignment DCI may be activated.

In this case, the k2 value may be determined by the capability of the terminal. When the BWP switch time is determined by the capability of the UE, the UE may transmit a capability value for setting the BWP switch time to the base station.

Likewise, when UL BWP switching is indicated for a UE through an UL grant DCI including resource allocation information for PUSCH, the UE is based on the slot in which the PDCCH including the DCI is received. The UL BWP switching time can be derived. From the slot in which the PDCCH is received, after the j slot, the existing UL BWP may be deactivated, and a new UL BWP indicated by the BIF included in the UL grant DCI may be activated. Here, the value j, which is the UL BWP switching time, may be determined by the capability of the terminal.

In addition, the UE may be configured not to transmit PUCCH or PUSCH through the existing UL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether PUCCH or PUSCH can be transmitted through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be determined by terminal capacity.

In addition, when the BWP switching time is determined by the terminal capability, the timing gap between the DCI reception time indicated by the time domain resource assignment information indicated by the DCI and the PUSCH transmission time accordingly gap) (for example, the k2 value) does not guarantee the BWP switching time-related capability indicated by the UE, the UE may not perform BWP switching according to the DCI indication.

According to another example, time domain PDSCH resource allocation information transmitted through UL grant DCI from a terminal receiving a UL grant DCI through an n-th slot (for example, timing gap between UL grant DCI and PUSCH transmission/reception gap) setting information), or if the PUSCH transmission slot according to the timing relationship setting information between the UL grant set by RRC signaling and the PUSCH transmission accordingly is an n+j1 slot, a random j2 based on the n+j1 slot DL BWP switching may be performed in the n+k1-j2 slot before the slot. For example, when j2=0, the existing UL BWP may be deactivated from the PUSCH transmission slot, and a new UL BWP indicated by the UL grant DCI may be activated.

In this case, the j2 value may be determined by the capability of the terminal. When the BWP switch time is determined by the capability of the UE, the UE may transmit a capability value for setting the BWP switch time to the base station.

The terminal may transmit/receive a data channel through a newly activated bandwidth part according to scheduling information included in DCI. In FIG. 11, it is shown that the bandwidth part is switched immediately after the k-slot, which is the BWP switching time, is switched, but this is an example and is not limited thereto. According to another example, switching of the bandwidth part may be performed when transmitting and receiving a data channel after the k0 slot according to scheduling information has elapsed.

The terminal activates a new bandwidth part indicated by a value of the bandwidth part indication field at the above-described switching time, and may transmit and receive a data channel with the base station. According to this, switching to a bandwidth part with low power consumption can be efficiently performed according to the capability of the terminal.

In the above, transmission and reception of a data channel through a newly activated bandwidth part between a terminal and a base station has been described, but the present invention is not limited thereto. According to an example, a terminal may transmit and receive a data channel with another terminal through a newly activated bandwidth part.

6 is a diagram illustrating a procedure for a base station to switch a bandwidth part in this embodiment.

Referring to FIG. 6, the base station may receive physical layer capability information including bandwidth part (BWP) switching delay type information from the terminal (S600).

The base station may transmit bandwidth part configuration information to the terminal. The base station may transmit bandwidth part configuration information to the terminal through higher layer signaling (eg, RRC signaling). The bandwidth part configuration information is information on a bandwidth part set including one or more bandwidth parts configured for the terminal. According to an example, the bandwidth part setting information may include index information indicating each bandwidth part of the bandwidth part set. Bandwidth part setting information for configuring the bandwidth part set has been described in step S500 of FIG. 5, and redundant descriptions will be omitted.

According to an example, a bandwidth part switching delay (BWP switching delay), which is a time taken to switch a bandwidth part being used for transmitting and receiving a data channel to another bandwidth part, may be determined by the capability of the terminal. Depending on the capabilities of the terminal, the terminal may be classified as one of a predetermined bandwidth part switching delay type classified into at least two or more types. For effective switching of the bandwidth part, the base station may receive physical layer capability information including switching delay type information determined by the capability of the terminal from the terminal.

That is, when downlink bandwidth part switching (DL BWP switching) for the terminal is instructed through DCI, the terminal is based on the slot in which the PDCCH including DCI is received, the downlink BWP switching time of the terminal (DL BWP switching). time) can be derived. According to an example, the switching delay type of the terminal may be determined according to the derived BWP switching time.

For example, a PDCCH including a DCI is received in an n-th slot, and in the (n+k)-th slot where k slots have elapsed, the existing active DL BWP is deactivated and the DL assignment DCI It is assumed that a new DL BWP indicated by is activated. In this case, according to an example, k, which is the time it takes to switch the DL BWP, may be determined by the capability of the terminal.

When the BWP switching time is determined by the capacity of the terminal, the base station may receive from the terminal a capability value of the terminal for setting the BWP switching time. When the base station wants to switch the bandwidth part used for transmission/reception of the data channel with the terminal, the base station may adjust the scheduling of the data channel by reflecting the received capacity value of the terminal.

Again, referring to FIG. 6, the base station indicates a bandwidth part indicating an activated bandwidth part and one other bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal by reflecting the traffic load of the terminal. The field may be determined (S610).

According to an example, the bandwidth part indication field (BIF) may be determined according to a value of N, which is the number of bandwidth parts included in a bandwidth part set configured for a terminal in a serving cell as shown in FIG. 4. The BIF is composed of log ₂ (N) bits and may indicate the index (index, 00, 01, 10, 11) of the BWP that is activated. Alternatively, the BIF is composed of log ₂ (N+1) bits and indicates not only the BWP index that is newly activated when switching BWP, but also indicates that the current active BWP is maintained. ) (For example, when log ₂ (N+1) bits are all '0').

Or, if the number of bandwidth parts configured for the terminal is less than or equal to 3 (N=<3), the BIF consists of log ₂ (N+1) bits, and the number of bandwidth parts is 4 (N=4) , BIF may be composed of log ₂ (N) bits. That is, when N is 1, it may consist of 1 bit, when N is 2, 2 bits, when N is 3, 2 bits, and when N is 4, it may consist of 2 bits.

The base station may transmit a downlink data channel to the terminal or receive an uplink data channel from the terminal through one bandwidth part indicated by downlink control information (DCI). According to an example, only one bandwidth part indicated by a bandwidth part indicator field (BIF) may be set at a specific time step. According to an example, the number of DL bandwidth parts and the number of UL bandwidth parts that can be used by the terminal may be set up to N (N is a natural number of 1 or more), respectively.

According to an embodiment, the bandwidth part indicated according to the value of the BIF may be determined by reflecting the uplink and downlink traffic loads for the terminal during data channel transmission and reception. When the power consumption when using a different bandwidth part is less than the power consumption according to the bandwidth part being used to transmit and receive the data channel between the terminal and the base station, the base station transmits a DCI indicating BWP switching to the other bandwidth part to the terminal. I can.

According to an example, the load when transmitting and receiving a data channel may be determined based on a state of a terminal or a state of a downlink data channel and an uplink data channel. As shown in FIG. 4, when N bandwidth parts having various bandwidths are configured for the terminal, the terminal or the base station may switch to an appropriate bandwidth part according to the traffic load of the terminal at an arbitrary point in time. At that time, the bandwidth part having the least power consumption may be selectively used, and thus power consumption due to maintaining unnecessary broadband-based bandwidth may be reduced.

For example, when the power consumption according to the currently used bandwidth part is greater than a predetermined reference value, the terminal or the base station may check the power consumption according to other bandwidth parts. If it is determined that the amount of power consumption according to the other bandwidth part is smaller, information indicating the corresponding bandwidth part may be included in the DCI. However, this is an example, and if it is possible to determine the power consumption for each bandwidth part, it will not be limited to a specific method.

Again, referring to FIG. 6, the base station may transmit downlink control information including the bandwidth part indication field and scheduling information for the data channel to the terminal (S620).

A bandwidth part indication field indicating a bandwidth part to be used for transmission and reception of a data channel among bandwidth parts included in the bandwidth part set configured in the terminal may be transmitted through scheduling DCI.

According to an example, downlink bandwidth part switching may be indicated through a downlink assignment DCI including resource allocation information for a PDSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include a downlink bandwidth part indication field (DL BIF) for downlink bandwidth part switching.

Whether to include the DL BIF may be determined by a DL assignment DCI format. That is, for a terminal in which one or more bandwidth parts are configured, DL BIF may be included only for DCI format 1_1 among DCI format 1_0 and DCI format 1_1, which are DCI formats that the corresponding terminal must monitor to receive PDSCH scheduling control information. Referring to FIG. 9, the base station may include scheduling information for DL BIF and PDSCH in DCI format 1_1 and transmit it to the terminal.

Alternatively, uplink bandwidth part switching may be indicated through an UL grant DCI including resource allocation information for PUSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include an uplink bandwidth part indication field (UL BIF) for uplink bandwidth part switching.

Whether to include the UL BIF may be determined by the UL grant DCI format. That is, for a UE in which one or more bandwidth parts are configured, UL BIF may be included only for DCI format 0_1 among DCI format 0_0 and DCI format 0_1, which are DCI formats that the UE must monitor in order to receive PUSCH scheduling control information. Referring to FIG. 10, the base station may transmit the UL BIF and PUSCH scheduling information to the terminal by including the scheduling information in DCI format 0_1.

9 and 10 illustrate a case in which scheduling information is included in downlink control information (DCI), but is not limited thereto. According to an example, DL BWP switching through DCI that does not include scheduling information for the PDSCH may be supported. For example, when the DL assignment DCI format is used only for DL BWP switching without PDSCH scheduling, all or part of the information areas other than the DL BIF among the information areas constituting the DL assignment DCI format (e.g., MCS field and/or PRB allocation field, etc.) may be set to a specific value (eg, '0'). Likewise, when the UL grant DCI format is used only for UL BWP switching without PUSCH scheduling, all or part of the information regions other than UL BIF among the information regions configuring the UL grant DCI format (e.g., MCS field and /or PRB allocation field, etc.) may be set to a specific value (eg, '0').

Again, referring to FIG. 6, when the bandwidth part indicated according to the value of the bandwidth part indication field is activated in consideration of the switching time determined according to the bandwidth part switching delay type information, the base station transmits and receives a data channel according to the scheduling information. Can be (S630).

When the DL bandwidth part switching for the UE is instructed through DCI, the UE may derive the downlink bandwidth part switching time of the UE based on the slot in which the PDCCH including DCI has been received. Referring to FIG. 9, the existing DL BWP may be deactivated after k slots from the slot in which the PDCCH is received, and a new DL BWP indicated by the DL assignment DCI may be activated. In FIG. 9, N is a decoding time of the PDCCH, and a bandwidth part switching time k including this may be determined by the capacity of the terminal.

According to another example, time domain PDSCH resource allocation information transmitted through DL assignment DCI from a terminal receiving a DL assignment DCI through an n-th slot (for example, timing gap between DL assignment DCI and PDSCH transmission/reception) gap) configuration information) or a PDSCH transmission slot according to the timing relationship configuration information between DL assignment set by RRC signaling and PDSCH transmission accordingly, if the PDSCH transmission slot is an n+k1 slot, an arbitrary k2 based on the n+k1 slot DL BWP switching may be performed in the n+k1-k2 slot before the slot. For example, when k2 = 0, the existing DL BWP from the PDSCH transmission slot may be deactivated, and a new DL BWP indicated by the DL assignment DCI may be activated.

In this case, the k2 value may be determined by the capability of the terminal. When the BWP transition time is determined by the capability of the terminal, the base station may receive a capability value for setting the BWP transition time from the terminal.

Similarly, when the base station instructs the UL bandwidth part switching for the terminal through the UL grant DCI (UL grant DCI) including the resource allocation information for the PUSCH, the terminal is the slot in which the reception of the PDCCH including the DCI was made. Based on the uplink bandwidth part switching time of the terminal can be derived. From the slot in which the PDCCH is received, the existing UL BWP may be deactivated and a new UL BWP indicated by the UL grant DCI may be activated. Here, the value j, which is the bandwidth part switching time, may be determined by the capability of the terminal.

According to another example, time domain PDSCH resource allocation information transmitted through UL grant DCI from a terminal receiving a UL grant DCI through an n-th slot (for example, timing gap between UL grant DCI and PUSCH transmission/reception gap) setting information), or if the PUSCH transmission slot according to the timing relationship setting information between the UL grant set by RRC signaling and the PUSCH transmission accordingly is an n+j1 slot, a random j2 based on the n+j1 slot DL BWP switching may be performed in the n+k1-j2 slot before the slot. For example, when j2=0, the existing UL BWP may be deactivated from the PUSCH transmission slot, and a new UL BWP indicated by the UL grant DCI may be activated.

In this case, the j2 value may be determined by the capability of the terminal. When the BWP transition time is determined by the capability of the terminal, the base station may receive a capability value for setting the BWP transition time from the terminal.

When a new bandwidth part indicated by a value of the bandwidth part indication field is activated according to the above-described switching time, the base station may transmit and receive a data channel with the terminal. Accordingly, it is possible to efficiently switch the bandwidth part according to the capability of the terminal.

As described above, according to the present specification, each operation by the base station may be performed by a specific other terminal. In this case, according to an embodiment, the contents described with respect to FIG. 6 may be substantially equally applied between the terminal and the other terminal.

7 is a diagram illustrating a procedure for a terminal to switch a bandwidth part in this embodiment.

Referring to FIG. 7, the terminal may transmit physical layer capability information including bandwidth part (BWP) switching delay type information (S700).

Since step S700 is substantially the same as step S500 of FIG. 5, detailed information will be omitted to avoid redundant description. Hereinafter, even in the case of the embodiment of FIG. 7, since the content described in FIG. 5 may be applied substantially the same, descriptions of content overlapping with the content described in FIG. 5 will be appropriately omitted.

As described above in FIG. 5, according to an example, the terminal may transmit a capability value of the terminal to the base station in order to switch the bandwidth part used for communication with the base station. In addition, according to another example, the terminal In order to switch the bandwidth part used for communication with another terminal, the capability value of the terminal may be transmitted to another terminal.

Again, referring to FIG. 7, the terminal indicates a bandwidth part indication field indicating an active bandwidth part and one other bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal, and scheduling information for a data channel. It is possible to receive downlink control information including (S710).

The terminal may receive a downlink data channel from the base station or transmit an uplink data channel to the base station through one bandwidth part indicated by the downlink control information (DCI) received from the base station. According to an example, the number of DL bandwidth parts and the number of UL bandwidth parts that can be used by the terminal may be set up to N (N is a natural number of 1 or more), respectively. However, this is an example, and the number of DL bandwidth parts and the number of UL bandwidth parts may be differently set.

A BIF indicating a bandwidth part to be used for transmission and reception of a data channel among bandwidth parts included in a bandwidth part set configured in the terminal may be transmitted through scheduling DCI. The downlink allocation DCI format configured to be monitored by the terminal may include a downlink bandwidth part indication field (DL BIF) for downlink bandwidth part switching.

Whether to include the DL BIF may be determined by the downlink allocation DCI format. That is, for a terminal in which one or more bandwidth parts are configured, DL BIF may be included only for DCI format 1_1 among DCI format 1_0 and DCI format 1_1, which are DCI formats that the corresponding terminal must monitor to receive PDSCH scheduling control information. Referring to FIG. 9, it is shown that scheduling information for DL BIF and PDSCH is included in DCI format 1_1.

Alternatively, uplink bandwidth part switching may be indicated through an UL grant DCI including resource allocation information for PUSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include an uplink bandwidth part indication field (UL BIF) for uplink bandwidth part switching.

Whether to include the UL BIF may be determined by the UL grant DCI format. In other words, UL BIF only for DCI format 0_1 among DCI format 0_0 and DCI format 0_1, which are DCI formats that the UE must monitor to receive uplink data channel (PUSCH) scheduling control information for a UE configured with one or more bandwidth parts. May be included. Referring to FIG. 10, it is shown that scheduling information for UL BIF and uplink data channels is included in DCI format 0_1.

According to an example, the bandwidth part indication field (BIF) may be determined according to a value of N, which is the number of bandwidth parts included in a bandwidth part set configured for a terminal in a serving cell as shown in FIG. 4. The BIF is composed of log ₂ (N) bits and may indicate the index (index, 00, 01, 10, 11) of the BWP that is activated. Alternatively, the BIF is composed of log ₂ (N+1) bits and indicates not only the BWP index that is newly activated when switching BWP, but also indicates that the current active BWP is maintained. ) (For example, when log ₂ (N+1) bits are all '0').

Or, if the number of bandwidth parts configured for the terminal is less than or equal to 3 (N=<3), the BIF consists of log ₂ (N+1) bits, and the number of bandwidth parts is 4 (N=4) , BIF may be composed of log ₂ (N) bits. That is, when N is 1, it may consist of 1 bit, when N is 2, 2 bits, when N is 3, 2 bits, and when N is 4, it may consist of 2 bits.

In the above, it has been described that the terminal receives the BIF indicating the bandwidth part to be activated newly from the base station in order to switch the bandwidth part, but is not limited thereto. According to an example, the terminal may receive a BIF indicating a bandwidth part to be newly activated from another terminal that has transmitted the capability value of the terminal.

Again, referring to FIG. 7, the terminal activates the bandwidth part indicated according to the BIF value in consideration of the transition time determined according to the bandwidth part switching delay type information (S720), and data according to the scheduling information Channels can be transmitted and received (S730).

When the DL bandwidth part switching for the UE is instructed through DCI, the UE may derive the DL BWP switching time of the UE based on the slot in which the PDCCH including DCI is received. Referring to FIG. 11, the UE deactivates the existing DL BWP from k slots after the slot in which the PDCCH is received, and activates a new DL BWP indicated by the bandwidth part indication field included in the DL assignment DCI. can do. The BWP switching time, that is, the BWP transition time k, may be determined by the capability of the terminal.

In addition, the terminal may be configured not to receive the PDCCH or PDSCH through the existing DL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether the PDCCH or PDSCH can be received through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be determined by UE capability.

The terminal may transmit/receive a data channel through a newly activated bandwidth part according to scheduling information included in DCI. In FIG. 11, it is shown that the bandwidth part is switched immediately after the k-slot, which is the BWP switching time, is switched, but this is an example and is not limited thereto. According to another example, switching of the bandwidth part may be performed when transmitting and receiving a data channel after the k0 slot according to scheduling information has elapsed.

According to an embodiment, when the transmission time of the data channel according to the scheduling information is before the BWP switching time elapses based on the reception time of the downlink control information, the terminal may maintain the activation of the currently active bandwidth part.

That is, as shown in FIG. 12, a timing gap (eg, a k0 value) between the DCI reception time point indicated by the scheduling information included in the DCI and the data channel reception time point is indicated by the terminal. If the BWP switching time (k)-related capability is not guaranteed, the terminal may not perform BWP switching according to the DCI instruction. In this case, according to an example, the UE may transmit and receive a data channel from a point in time when k0 slots determined as scheduling information have elapsed while maintaining the previous bandwidth part.

In addition, according to an embodiment, when the transmission time of the data channel according to the scheduling information is before the BWP switching time elapses based on the reception time of the downlink control information, the terminal activates a predetermined default bandwidth part (default BWP). can do. That is, as shown in FIG. 13, when a value k0, which is a timing gap between the DCI reception time indicated by the scheduling information included in the DCI and the data channel reception time, precedes the BWP switching time k indicated by the UE, the UE May not perform BWP switching according to the DCI instruction.

In this case, the terminal may activate a predetermined default bandwidth part and transmit and receive a data channel. The default bandwidth part illustrated in FIG. 13 is an example, and is not limited to the form illustrated in FIG. 13. According to an example, when the default bandwidth part is switched when k slots elapse, the terminal may transmit information indicating that data channel reception is possible to the base station, or may request DCI including new scheduling information for the data channel.

Alternatively, according to another example, the switching time kd to the default bandwidth part as the capability of the terminal may be set to be shorter than the general BWP switching time k. In this case, if kd is faster than k0, the UE may switch to the default bandwidth part when kd elapses after PDCCH reception, different from that shown in FIG. 13.

Further, according to an embodiment, when the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the initial bandwidth part set for initial access (initial BWP) Can be activated. That is, as shown in FIG. 14, when a value k0, which is a timing gap between the DCI reception time indicated by the scheduling information included in the DCI and the data channel reception time, precedes the BWP switching time k indicated by the UE, the UE May not perform BWP switching according to the DCI instruction.

In this case, the terminal may activate an initial bandwidth part and transmit and receive a data channel. The initial bandwidth part illustrated in FIG. 14 is an example, and is not limited to the form illustrated in FIG. 14. According to an example, when the initial bandwidth part is switched when k slots elapse, the terminal may transmit information indicating that data channel reception is possible to the base station, or may request DCI including new scheduling information for the data channel.

Alternatively, according to another example, the switching time ki to the initial bandwidth part as the capability of the terminal may be set to be shorter than the general BWP switching time k. In this case, if ki is faster than k0, the UE may switch to the initial bandwidth part at a point in time when ki has elapsed after PDCCH reception, unlike that shown in FIG. 14.

11 to 14 are shown in connection with transmission of a downlink data channel, but this can be applied substantially equally to transmission of an uplink data channel. That is, when UL BWP switching is indicated for the UE through the UL grant DCI including resource allocation information for the PUSCH, the UE is based on the slot in which the PDCCH including the DCI is received. The UL BWP switching time can be derived. From the slot in which the PDCCH is received, after the j slot, the existing UL BWP may be deactivated, and a new UL BWP indicated by the BIF included in the UL grant DCI may be activated. Here, the value j, which is the UL BWP switching time, may be determined by the capability of the terminal.

In addition, the UE may be configured not to transmit PUCCH or PUSCH through the existing UL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether PUCCH or PUSCH can be transmitted through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be determined by terminal capacity.

In addition, when the BWP switching time is determined by the terminal capability, the timing gap between the DCI reception time indicated by the time domain resource assignment information indicated by the DCI and the PUSCH transmission time accordingly gap) (for example, the k2 value) does not guarantee the BWP switching time-related capability indicated by the UE, the UE may not perform BWP switching according to the DCI indication.

In this case, as described with reference to FIGS. 12 to 14, the existing active bandwidth part may be maintained, a predetermined default bandwidth part may be changed, or an initial bandwidth part may be switched to transmit a data channel for an uplink.

As described above, the terminal may activate a new bandwidth part and transmit and receive a data channel with the base station. According to this, switching to a new bandwidth part can be efficiently performed according to the capability of the terminal.

In the above, transmission and reception of a data channel through a newly activated bandwidth part between a terminal and a base station has been described, but the present invention is not limited thereto. According to an example, a terminal may transmit and receive a data channel with another terminal through a newly activated bandwidth part.

8 is a diagram illustrating a procedure for a base station to switch a bandwidth part in this embodiment.

Referring to FIG. 8, the base station may receive physical layer capability information including bandwidth part (BWP) switching delay type information from the terminal (S800).

Since step S800 is substantially the same as step S600 of FIG. 6, detailed information will be omitted to avoid redundant description. Hereinafter, even in the case of the embodiment of FIG. 8, since the content described in FIG. 6 may be applied substantially the same, descriptions of content overlapping with the content described in FIG. 6 will be appropriately omitted.

Again, referring to FIG. 8, the base station may determine a bandwidth part indication field indicating any one other bandwidth part from the activated bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal (S810). .

According to an example, the bandwidth part indication field (BIF) may be determined according to a value of N, which is the number of bandwidth parts included in a bandwidth part set configured for a terminal in a serving cell as shown in FIG. 4. The BIF is composed of log ₂ (N) bits and may indicate the index (index, 00, 01, 10, 11) of the BWP that is activated. Alternatively, the BIF is composed of log ₂ (N+1) bits and indicates not only the BWP index that is newly activated when switching BWP, but also indicates that the current active BWP is maintained. ) (For example, when log ₂ (N+1) bits are all '0').

Or, if the number of bandwidth parts configured for the terminal is less than or equal to 3 (N=<3), the BIF consists of log ₂ (N+1) bits, and the number of bandwidth parts is 4 (N=4) , BIF may be composed of log ₂ (N) bits. That is, when N is 1, it may consist of 1 bit, when N is 2, 2 bits, when N is 3, 2 bits, and when N is 4, it may consist of 2 bits.

The base station may transmit a downlink data channel to the terminal or receive an uplink data channel from the terminal through one bandwidth part indicated by downlink control information (DCI). According to an example, only one bandwidth part indicated by a bandwidth part indicator field (BIF) may be set at a specific time step. According to an example, the number of DL bandwidth parts and the number of UL bandwidth parts that can be used by the terminal may be set up to N (N is a natural number of 1 or more), respectively.

Again, referring to FIG. 8, the base station may transmit downlink control information including the bandwidth part indication field and scheduling information for the data channel to the terminal (S820).

A bandwidth part indication field indicating a bandwidth part to be used for transmission and reception of a data channel among bandwidth parts included in the bandwidth part set configured in the terminal may be transmitted through scheduling DCI.

According to an example, downlink bandwidth part switching may be indicated through a downlink assignment DCI including resource allocation information for a PDSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include a downlink bandwidth part indication field (DL BIF) for downlink bandwidth part switching.

Whether to include the DL BIF may be determined by a DL assignment DCI format. That is, for a terminal in which one or more bandwidth parts are configured, DL BIF may be included only for DCI format 1_1 among DCI format 1_0 and DCI format 1_1, which are DCI formats that the corresponding terminal must monitor to receive PDSCH scheduling control information. Referring to FIG. 9, the base station may include scheduling information for DL BIF and PDSCH in DCI format 1_1 and transmit it to the terminal.

Alternatively, uplink bandwidth part switching may be indicated through an UL grant DCI including resource allocation information for PUSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include an uplink bandwidth part indication field (UL BIF) for uplink bandwidth part switching.

Whether to include the UL BIF may be determined by the UL grant DCI format. That is, for a UE in which one or more bandwidth parts are configured, UL BIF may be included only for DCI format 0_1 among DCI format 0_0 and DCI format 0_1, which are DCI formats that the UE must monitor in order to receive PUSCH scheduling control information. Referring to FIG. 10, the base station may transmit the UL BIF and PUSCH scheduling information to the terminal by including the scheduling information in DCI format 0_1.

Again, referring to FIG. 8, when the bandwidth part indicated according to the value of the bandwidth part indication field is activated in consideration of the switching time determined according to the bandwidth part switching delay type information, the base station transmits and receives the data channel according to the scheduling information. Can be (S830).

When the DL bandwidth part switching for the UE is instructed through DCI, the UE may derive the downlink bandwidth part switching time of the UE based on the slot in which the PDCCH including DCI has been received. Referring to FIG. 11, the existing DL BWP may be deactivated after k slots from the slot in which the PDCCH is received, and a new DL BWP indicated by the DL assignment DCI may be activated. In FIG. 9, N is a decoding time of the PDCCH, and a bandwidth part switching time k including this may be determined by the capacity of the terminal.

Similarly, when the base station instructs the UL bandwidth part switching for the terminal through the UL grant DCI (UL grant DCI) including the resource allocation information for the PUSCH, the terminal is the slot in which the reception of the PDCCH including the DCI was made. Based on the uplink bandwidth part switching time of the terminal can be derived. From the slot in which the PDCCH is received, the existing UL BWP may be deactivated and a new UL BWP indicated by the UL grant DCI may be activated. Here, the value j, which is the bandwidth part switching time, may be determined by the capability of the terminal.

The base station may transmit and receive a data channel through a newly activated bandwidth part according to scheduling information included in DCI. In FIG. 11, it is shown that the bandwidth part is switched immediately after the k-slot, which is the BWP switching time, is switched, but this is an example and is not limited thereto. According to another example, switching of the bandwidth part may be performed when transmitting and receiving a data channel after the k0 slot according to scheduling information has elapsed.

According to an embodiment, when the transmission time of the data channel according to the scheduling information is before the BWP switching time elapses based on the reception time of the downlink control information, the base station may maintain activation of the currently active bandwidth part.

That is, as shown in FIG. 12, a timing gap (eg, a k0 value) between the DCI reception time point indicated by the scheduling information included in the DCI and the data channel reception time point is indicated by the terminal. If the BWP switching time (k)-related capability is not guaranteed, the terminal may not perform BWP switching according to the DCI instruction. In this case, according to an example, the base station may transmit and receive a data channel from a point in time when k0 slots determined as scheduling information have elapsed while maintaining the previous bandwidth part.

In addition, according to an embodiment, when the transmission time of the data channel according to the scheduling information is before the BWP switching time elapses based on the reception time of the downlink control information, the activated predetermined default bandwidth part (default BWP) Through the data channel can be transmitted and received. That is, as shown in FIG. 13, when a value k0, which is a timing gap between the DCI reception time indicated by the scheduling information included in the DCI and the data channel reception time, precedes the BWP switching time k indicated by the UE, the UE May not perform BWP switching according to the DCI instruction.

In this case, the base station may transmit the data channel through the default bandwidth part activated by the terminal. According to an example, when the default bandwidth part is switched when k slots elapse, the base station receives information from the terminal that the data channel can be received at the base station, or receives a DCI request including new scheduling information for the data channel. I can.

Alternatively, according to another example, the switching time kd to the default bandwidth part as the capability of the terminal may be set to be shorter than the general BWP switching time k. In this case, if kd is faster than k0, the UE may switch to the default bandwidth part when kd elapses after PDCCH reception, different from that shown in FIG. 13. In this case, the base station may transmit the data channel in the default bandwidth part when k0 elapses.

In addition, according to an embodiment, when the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the base station provides data through the activated initial bandwidth part (initial BWP). Channel can be transmitted. That is, as shown in FIG. 14, when a value k0, which is a timing gap between the DCI reception time indicated by the scheduling information included in the DCI and the data channel reception time, precedes the BWP switching time k indicated by the UE, the UE May not perform BWP switching according to the DCI instruction.

In this case, the base station may transmit the data channel through the initial bandwidth part activated by the terminal. According to an example, when the initial bandwidth part is switched when k slots elapse, the base station may receive information indicating that data channel reception is possible from the terminal, or may receive a DCI request including new scheduling information for the data channel. .

Alternatively, according to another example, the switching time ki to the initial bandwidth part as the capability of the terminal may be set to be shorter than the general BWP switching time k. In this case, if ki is faster than k0, the UE may switch to the initial bandwidth part at a point in time when ki has elapsed after PDCCH reception, unlike that shown in FIG. 14. In this case, when k0 elapses, the base station may transmit the data channel in the initial bandwidth part.

11 to 14 are shown in connection with transmission of a downlink data channel, but this can be applied substantially equally to transmission of an uplink data channel. That is, when UL BWP switching is indicated for the UE through the UL grant DCI including resource allocation information for the PUSCH, the UE is based on the slot in which the PDCCH including the DCI is received. The UL BWP switching time can be derived. From the slot in which the PDCCH is received, after the j slot, the existing UL BWP may be deactivated, and a new UL BWP indicated by the BIF included in the UL grant DCI may be activated. Here, the value j, which is the UL BWP switching time, may be determined by the capability of the terminal.

In addition, the UE may be configured not to transmit PUCCH or PUSCH through the existing UL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether PUCCH or PUSCH can be transmitted through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be determined by terminal capacity.

In addition, when the BWP switching time is determined by the terminal capability, the timing gap between the DCI reception time indicated by the time domain resource assignment information indicated by the DCI and the PUSCH transmission time accordingly gap) (for example, the k2 value) does not guarantee the BWP switching time-related capability indicated by the UE, the UE may not perform BWP switching according to the DCI indication.

In this case, as described with reference to FIGS. 12 to 14, the terminal can maintain the existing activated bandwidth part, switch to a predetermined default bandwidth part, or switch to the initial bandwidth part, and the base station can change the activated bandwidth part. Through this, a data channel for uplink can be received.

When a new bandwidth part indicated by a value of the bandwidth part indication field is activated according to the above-described switching time, the base station may transmit and receive a data channel with the terminal. Accordingly, it is possible to efficiently switch the bandwidth part according to the capability of the terminal.

As described above, according to the present specification, each operation by the base station may be performed by a specific other terminal. In this case, according to an embodiment, the contents described with respect to FIG. 6 may be substantially equally applied between the terminal and the other terminal.

15 is a diagram showing a configuration of a base station according to the present embodiments.

Referring to FIG. 15, a base station 1500 includes a control unit 1510, a transmission unit 1520, and a reception unit 1530.

The transmitting unit 1520 and the receiving unit 1530 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention with the terminal.

The receiver 1530 may receive physical layer capability information including bandwidth part switching delay type information from the terminal. According to an example, a bandwidth part switching delay (BWP switching delay), which is a time taken to switch a bandwidth part being used for transmitting and receiving a data channel to another bandwidth part, may be determined by the capability of the terminal. Depending on the capabilities of the terminal, the terminal may be classified as one of a predetermined bandwidth part switching delay type classified into at least two or more types.

That is, when downlink bandwidth part switching (DL BWP switching) for the terminal is instructed through DCI, the terminal is the downlink bandwidth part switching time (DL BWP) of the terminal based on the slot in which the PDCCH including DCI was received. switching time) can be derived. According to an example, the switching delay type of the terminal may be determined according to the derived bandwidth part switching time.

For example, a PDCCH including a DCI is received in an n-th slot, and in the (n+k)-th slot where k slots have elapsed, the existing active DL BWP is deactivated and the DL assignment DCI It is assumed that a new DL BWP indicated by is activated. In this case, according to an example, k, which is a time taken to switch the downlink bandwidth part, may be determined by the capability of the terminal.

In this way, when the BWP switching time is determined by the capacity of the terminal, the reception unit 1530 may receive a capability value of the terminal for setting the bandwidth part switching time from the terminal. Thereafter, when it is desired to switch the bandwidth part used for transmission and reception of the data channel with the terminal, the controller 1510 may adjust the scheduling of the data channel by reflecting the received capability value of the terminal.

The controller 1510 may configure bandwidth part (BWP) setting information for a set of bandwidth parts consisting of one or more bandwidth parts set for the terminal.

In this case, the above-described bandwidth part configuration information may include index information indicating each bandwidth part of the bandwidth part set for a bandwidth part set composed of one or more bandwidth parts configured for the terminal. The base station may transmit bandwidth part configuration information to the terminal through higher layer signaling (eg, RRC signaling).

In addition, the controller 1510 may determine a bandwidth part indication field indicating any one bandwidth part different from the activated bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal.

According to an example, only one bandwidth part indicated by a bandwidth part indicator field (BIF) may be set at a specific time step. According to an example, the number of DL bandwidth parts and the number of UL bandwidth parts that can be used by the terminal may be set up to N (N is a natural number of 1 or more), respectively.

According to an example, the bandwidth part indication field (BIF) may be determined according to a value of N, which is the number of bandwidth parts included in a bandwidth part set configured for a terminal in a serving cell as shown in FIG. 4. The BIF is composed of log ₂ (N) bits and may indicate the index (index, 00, 01, 10, 11) of the BWP that is activated. Alternatively, the BIF is composed of log ₂ (N+1) bits and indicates not only the BWP index that is newly activated when switching BWP, but also indicates that the current active BWP is maintained. ) (For example, when log ₂ (N+1) bits are all '0').

Or, if the number of bandwidth parts configured for the terminal is less than or equal to 3 (N=<3), the BIF consists of log ₂ (N+1) bits, and the number of bandwidth parts is 4 (N=4) , BIF may be composed of log ₂ (N) bits. That is, when N is 1, it may consist of 1 bit, when N is 2, 2 bits, when N is 3, 2 bits, and when N is 4, it may consist of 2 bits.

According to an embodiment, the bandwidth part indicated according to the value of the bandwidth part indication field may be determined by reflecting a load during data channel transmission and reception. When it is determined that power consumption when using a different bandwidth part is less than that according to the bandwidth part being used to transmit and receive a data channel between the terminal and the base station, the controller 1510 instructs the switching of the bandwidth part to the other bandwidth part. DCI can be created.

The transmitter 1520 may transmit downlink control information including a bandwidth part indication field and scheduling information for a data channel to the terminal. In addition, when the bandwidth part indicated according to the value of the bandwidth part indication field is activated in consideration of the switching time determined according to the bandwidth part switching delay type information, the transmitter 1520 may transmit the data channel according to the scheduling information.

The transmitter 1520 may transmit a bandwidth part indication field indicating a bandwidth part to be used for transmission/reception of a data channel among bandwidth parts included in a bandwidth part set configured in the terminal through scheduling DCI.

According to an example, downlink bandwidth part switching may be indicated through a downlink assignment DCI including resource allocation information for a PDSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include a downlink bandwidth part indication field (DL BIF) for downlink bandwidth part switching.

Whether to include the DL BIF may be determined by a DL assignment DCI format. That is, for a terminal in which one or more bandwidth parts are configured, DL BIF may be included only for DCI format 1_1 among DCI format 1_0 and DCI format 1_1, which are DCI formats that the corresponding terminal must monitor to receive PDSCH scheduling control information. Referring to FIG. 9, the transmitter 1520 may include scheduling information for DL BIF and PDSCH in DCI format 1_1 and transmit it to a terminal.

Alternatively, uplink bandwidth part switching may be indicated through an UL grant DCI including resource allocation information for PUSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include an uplink bandwidth part indication field (UL BIF) for uplink bandwidth part switching.

Whether to include the UL BIF may be determined by the UL grant DCI format. That is, for a UE in which one or more bandwidth parts are configured, UL BIF may be included only for DCI format 0_1 among DCI format 0_0 and DCI format 0_1, which are DCI formats that the UE must monitor in order to receive PUSCH scheduling control information. Referring to FIG. 10, the transmitter 1520 may include scheduling information for UL BIF and PUSCH in DCI format 0_1 and transmit it to a terminal.

The controller 1510 may control the transmission unit 1520 and the reception unit 1530 to transmit and receive a data channel when the bandwidth part indicated according to the value of the bandwidth part indication field is activated in the terminal.

When the DL bandwidth part switching for the UE is instructed through DCI, the UE may derive the downlink bandwidth part switching time of the UE based on the slot in which the PDCCH including DCI has been received. Referring to FIG. 9, the existing DL BWP may be deactivated after k slots from the slot in which the PDCCH is received, and a new DL BWP indicated by the DL assignment DCI may be activated. Here, the value k, which is the bandwidth part switching time, may be determined by the capability of the terminal.

According to another example, time domain PDSCH resource allocation information transmitted through DL assignment DCI from a terminal receiving a DL assignment DCI through an n-th slot (for example, timing gap between DL assignment DCI and PDSCH transmission/reception) gap) configuration information) or a PDSCH transmission slot according to the timing relationship configuration information between DL assignment set by RRC signaling and PDSCH transmission accordingly, if the PDSCH transmission slot is an n+k1 slot, an arbitrary k2 based on the n+k1 slot DL BWP switching may be performed in the n+k1-k2 slot before the slot. For example, when k2 = 0, the existing DL BWP from the PDSCH transmission slot may be deactivated, and a new DL BWP indicated by the DL assignment DCI may be activated.

In this case, the k2 value may be determined by the capability of the terminal. When the BWP transition time is determined by the capability of the terminal, the receiver 1010 may receive a capability value for setting the BWP transition time from the terminal.

Similarly, when the base station instructs the UL bandwidth part switching for the terminal through the UL grant DCI (UL grant DCI) including the resource allocation information for the PUSCH, the terminal is the slot in which the reception of the PDCCH including the DCI was made. Based on the uplink bandwidth part switching time of the terminal can be derived. From the slot in which the PDCCH is received, the existing UL BWP may be deactivated and a new UL BWP indicated by the UL grant DCI may be activated. Here, the value j, which is the bandwidth part switching time, may be determined by the capability of the terminal.

According to another example, time domain PDSCH resource allocation information transmitted through UL grant DCI from a terminal receiving a UL grant DCI through an n-th slot (for example, timing gap between UL grant DCI and PUSCH transmission/reception gap) setting information), or if the PUSCH transmission slot according to the timing relationship setting information between the UL grant set by RRC signaling and the PUSCH transmission accordingly is an n+j1 slot, a random j2 based on the n+j1 slot DL BWP switching may be performed in the n+k1-j2 slot before the slot. For example, when j2=0, the existing UL BWP may be deactivated from the PUSCH transmission slot, and a new UL BWP indicated by the UL grant DCI may be activated.

In this case, the j2 value may be determined by the capability of the terminal. When the BWP transition time is determined by the capability of the terminal, the receiver 1010 may receive a capability value for setting the BWP transition time from the terminal.

The transmitter 1520 may transmit a data channel through a newly activated bandwidth part according to scheduling information included in DCI. In FIG. 11, it is shown that the bandwidth part is switched immediately after the k-slot, which is the BWP switching time, is switched, but this is an example and is not limited thereto. According to another example, switching of the bandwidth part may be performed when the data channel is transmitted after the k0 slot according to the scheduling information has elapsed.

According to an embodiment, when the transmission time of the data channel according to the scheduling information is before the BWP switching time elapses based on the reception time of the downlink control information, the transmission unit 1520 may maintain activation of the currently active bandwidth part. have.

That is, as shown in FIG. 12, a timing gap (eg, a k0 value) between the DCI reception time point indicated by the scheduling information included in the DCI and the data channel reception time point is indicated by the terminal. If the BWP switching time (k)-related capability is not guaranteed, the terminal may not perform BWP switching according to the DCI instruction. In this case, according to an example, the transmission unit 1520 may transmit the data channel from a point in time when k0 slots determined as scheduling information have elapsed while maintaining the previous bandwidth part.

In addition, according to an embodiment, when the transmission time of the data channel according to the scheduling information is before the BWP switching time elapses based on the reception time of the downlink control information, the activated predetermined default bandwidth part ( The data channel can be transmitted through the default BWP). That is, as shown in FIG. 13, when a value k0, which is a timing gap between the DCI reception time indicated by the scheduling information included in the DCI and the data channel reception time, precedes the BWP switching time k indicated by the UE, the UE May not perform BWP switching according to the DCI instruction.

In this case, the transmitter 1520 may transmit the data channel through the default bandwidth part activated by the terminal. According to an example, when the default bandwidth part is switched when k slots elapse, the reception unit 1530 receives information indicating that data channel reception is possible at the base station from the terminal, or a DCI request including new scheduling information for the data channel. Can be received.

Alternatively, according to another example, the switching time kd to the default bandwidth part as the capability of the terminal may be set to be shorter than the general BWP switching time k. In this case, if kd is faster than k0, the UE may switch to the default bandwidth part when kd elapses after PDCCH reception, different from that shown in FIG. 13. In this case, the transmitter 1520 may transmit the data channel in the default bandwidth part when k0 elapses.

In addition, according to an embodiment, when the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the activated initial bandwidth part (initial BWP) The data channel can be transmitted through. That is, as shown in FIG. 14, when a value k0, which is a timing gap between the DCI reception time indicated by the scheduling information included in the DCI and the data channel reception time, precedes the BWP switching time k indicated by the UE, the UE May not perform BWP switching according to the DCI instruction.

In this case, the transmitter 1520 may transmit the data channel through the initial bandwidth part activated by the terminal. According to an example, when the initial bandwidth part is switched when k slots elapse, the reception unit 1530 receives information indicating that data channel reception is possible from the terminal, or receives a DCI request including new scheduling information for the data channel. can do.

Alternatively, according to another example, the switching time ki to the initial bandwidth part as the capability of the terminal may be set to be shorter than the general BWP switching time k. In this case, if ki is faster than k0, the UE may switch to the initial bandwidth part at a point in time when ki has elapsed after PDCCH reception, unlike that shown in FIG. 14. In this case, the transmitter 1520 may transmit the data channel in the initial bandwidth part when k0 elapses.

11 to 14 are shown in connection with transmission of a downlink data channel, but this can be applied substantially equally to transmission of an uplink data channel. That is, when UL BWP switching is indicated for the UE through the UL grant DCI including resource allocation information for the PUSCH, the UE is based on the slot in which the PDCCH including the DCI is received. The UL BWP switching time can be derived. From the slot in which the PDCCH is received, after the j slot, the existing UL BWP may be deactivated, and a new UL BWP indicated by the BIF included in the UL grant DCI may be activated. Here, the value j, which is the UL BWP switching time, may be determined by the capability of the terminal.

In addition, the UE may be configured not to transmit PUCCH or PUSCH through the existing UL BWP during the DCI reception time including the BWP switching indication information and the corresponding BWP switching time. Alternatively, whether PUCCH or PUSCH can be transmitted through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be determined by terminal capacity.

In addition, when the BWP switching time is determined by the terminal capability, the timing gap between the DCI reception time indicated by the time domain resource assignment information indicated by the DCI and the PUSCH transmission time accordingly gap) (for example, the k2 value) does not guarantee the BWP switching time-related capability indicated by the UE, the UE may not perform BWP switching according to the DCI indication.

In this case, as described above, the terminal may maintain the existing active bandwidth part, switch to a predetermined default bandwidth part, or switch to the initial bandwidth part, and the receiver 1530 may, through the activated bandwidth part, A data channel for uplink can be received.

When a new bandwidth part indicated by a value of the bandwidth part indication field is activated according to the above-described switching time, the base station may transmit and receive a data channel with the terminal. Accordingly, it is possible to efficiently switch the bandwidth part according to the capability of the terminal.

When the new bandwidth part indicated by the value of the bandwidth part indication field is activated according to the above-described switching time, the transmitter 1520 and the receiver 1530 may transmit and receive a data channel with the terminal. Accordingly, it is possible to efficiently switch the bandwidth part according to the capability of the terminal.

According to the present specification, each operation by the base station may be performed by a specific other terminal. In this case, according to an embodiment, the contents described with respect to FIG. 6 may be substantially equally applied between the terminal and the other terminal.

16 is a diagram showing a configuration of a terminal according to the present embodiments.

Referring to FIG. 16, the terminal 1600 includes a receiving unit 1610, a control unit 1620 and a transmitting unit 1630.

The controller 1620 may control an overall operation for the terminal to transmit and receive a data channel. The transmitting unit 1630 and the receiving unit 1610 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention with the base station.

The receiver 1610 may receive bandwidth part (BWP) configuration information for a set of bandwidth parts consisting of one or more bandwidth parts set for the terminal. In this case, the above-described bandwidth part configuration information may include index information indicating each bandwidth part of the bandwidth part set for a bandwidth part set composed of one or more bandwidth parts configured for the terminal.

The transmitter 1630 may transmit physical layer capability information including bandwidth part switching delay type information to the base station. According to an example, a bandwidth part switching delay (BWP switching delay), which is a time taken to switch a bandwidth part being used for transmitting and receiving a data channel to another bandwidth part, may be determined by the capability of the terminal. Depending on the capabilities of the terminal, the terminal may be classified as one of a predetermined bandwidth part switching delay type classified into at least two or more types.

That is, when downlink bandwidth part switching (DL BWP switching) for the terminal is instructed through DCI, the controller 1620 is the downlink bandwidth part switching time of the terminal based on the slot in which the PDCCH including DCI was received. (DL BWP switching time) can be derived. According to an example, the switching delay type of the terminal may be determined according to the derived bandwidth part switching time.

For example, a PDCCH including a DCI is received in an n-th slot, and in the (n+k)-th slot where k slots have elapsed, the existing active DL BWP is deactivated and the DL assignment DCI It is assumed that a new DL BWP indicated by is activated. In this case, according to an example, k, which is a time taken to switch the downlink bandwidth part, may be determined by the capability of the terminal.

In this way, when the BWP switching time is determined by the capacity of the terminal, the transmission unit 1530 may transmit a capability value of the terminal for setting the bandwidth part switching time to the base station.

In the above, it has been described that the capability value of the terminal is transmitted to the base station in order to switch the bandwidth part used for communication between the terminal and the base station, but the present invention is not limited thereto. According to an example, the transmitter 1630 may transmit a capability value of a terminal to another terminal in order to switch a bandwidth part used for communication with another terminal.

The receiving unit 1610 includes a bandwidth part indication field indicating one or more bandwidth parts other than the activated bandwidth part among one or more bandwidth parts included in a bandwidth part set configured in the terminal, and a downlink including scheduling information for a data channel. Control information can be received from the base station. According to an example, only one bandwidth part indicated by a bandwidth part indicator field (BIF) may be set at a specific time step. According to an example, the number of DL bandwidth parts and the number of UL bandwidth parts that can be used by the terminal may be set up to N (N is a natural number of 1 or more), respectively.

The receiver 1610 may receive a bandwidth part indication field indicating a bandwidth part to be used for transmission and reception of a data channel among bandwidth parts included in a bandwidth part set configured in the terminal through scheduling DCI.

According to an example, downlink bandwidth part switching may be indicated through a downlink assignment DCI including resource allocation information for a PDSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include a downlink bandwidth part indication field (DL BIF) for downlink bandwidth part switching.

Whether to include the DL BIF may be determined by a DL assignment DCI format. That is, for a terminal in which one or more bandwidth parts are configured, DL BIF may be included only for DCI format 1_1 among DCI format 1_0 and DCI format 1_1, which are DCI formats that the corresponding terminal must monitor to receive PDSCH scheduling control information. Referring to FIG. 9, the receiving unit 1610 may receive a DCI format 1_1 including scheduling information for DL BIF and PDSCH from a base station.

Alternatively, uplink bandwidth part switching may be indicated through an UL grant DCI including resource allocation information for PUSCH. In this case, the downlink assignment DCI format configured to be monitored by the terminal may include an uplink bandwidth part indication field (UL BIF) for uplink bandwidth part switching.

Whether to include the UL BIF may be determined by the UL grant DCI format. That is, for a UE in which one or more bandwidth parts are configured, UL BIF may be included only for DCI format 0_1 among DCI format 0_0 and DCI format 0_1, which are DCI formats that the UE must monitor in order to receive PUSCH scheduling control information. Referring to FIG. 10, the receiver 1610 may receive a DCI format 0_1 including scheduling information for UL BIF and PUSCH from a base station.

According to an example, the bandwidth part indication field (BIF) may be determined according to a value of N, which is the number of bandwidth parts included in a bandwidth part set configured for a terminal in a serving cell as shown in FIG. 4. The BIF is composed of log ₂ (N) bits and may indicate the index (index, 00, 01, 10, 11) of the BWP that is activated. Alternatively, the BIF is composed of log ₂ (N+1) bits and indicates not only the BWP index that is newly activated when switching BWP, but also indicates that the current active BWP is maintained. ) (For example, when log ₂ (N+1) bits are all '0').

Or, if the number of bandwidth parts configured for the terminal is less than or equal to 3 (N=<3), the BIF consists of log ₂ (N+1) bits, and the number of bandwidth parts is 4 (N=4) , BIF may be composed of log ₂ (N) bits. That is, when N is 1, it may consist of 1 bit, when N is 2, 2 bits, when N is 3, 2 bits, and when N is 4, it may consist of 2 bits.

In the above, it has been described that the receiving unit 1610 receives a BIF indicating a bandwidth part to be activated newly from the base station in order for the terminal to switch the bandwidth part, but is not limited thereto. According to an example, the reception unit 1610 may receive a BIF indicating a bandwidth part to be newly activated from another terminal that has transmitted the capability value of the terminal.

The controller 1620 may activate the bandwidth part indicated according to the value of the bandwidth part indication field, and control the transmission unit 1630 and the reception unit 1610 to transmit and receive a data channel through the activated bandwidth part.

When the DL bandwidth part switching for the UE is instructed through DCI, the controller 1620 may derive the downlink bandwidth part switching time of the UE based on the slot in which the PDCCH including the DCI has been received. Referring to FIG. 11, the controller 1620 may deactivate an existing DL BWP from k slots after a slot in which a PDCCH is received, and activate a new DL BWP indicated by the DL assignment DCI. The BWP switching time, that is, the BWP transition time k, may be determined by the capability of the terminal.

According to another example, the control unit 1620 is the time domain PDSCH resource allocation information (e.g., DL assignment DCI and PDSCH transmission and reception) transmitted through the DL assignment DCI from the terminal receiving the DL assignment DCI through an n-th slot. When the PDSCH transmission slot according to the timing relationship setting information between the DL assignment and PDSCH transmission set by RRC signaling is n+k1 slot, the n+k1 slot is As a reference, DL BWP switching can be performed in n+k1-k2 slots before any k2 slot. For example, when k2 = 0, the control unit 1620 may deactivate the existing DL BWP from the PDSCH transmission slot and activate a new DL BWP indicated by the DL assignment DCI.

In this case, the k2 value may be determined by the capability of the terminal. When the BWP transition time is determined by the capability of the terminal, the transmitter 1630 may transmit a capability value for setting the BWP transition time to the base station.

Similarly, when the base station instructs the UL bandwidth part switching for the terminal through the UL grant DCI (UL grant DCI) including the resource allocation information for the PUSCH, the control unit 1620 receives the PDCCH including the DCI Based on the made slot, it is possible to derive the uplink bandwidth part switching time of the terminal. The controller 1620 may deactivate the existing UL BWP from the slot j from the slot in which the PDCCH is received, and activate a new UL BWP indicated by the UL grant DCI. Here, the value j, which is the bandwidth part switching time, may be determined by the capability of the terminal.

According to another example, time domain PDSCH resource allocation information transmitted through UL grant DCI from a terminal receiving a UL grant DCI through an n-th slot (for example, timing gap between UL grant DCI and PUSCH transmission/reception gap) setting information), or if the PUSCH transmission slot according to the timing relationship setting information between the UL grant set by RRC signaling and the PUSCH transmission accordingly is an n+j1 slot, a random j2 based on the n+j1 slot DL BWP switching may be performed in the n+k1-j2 slot before the slot. For example, when j2=0, the control unit 1620 may deactivate an existing UL BWP from a PUSCH transmission slot and activate a new UL BWP indicated by the UL grant DCI.

In this case, the j2 value may be determined by the capability of the terminal. When the BWP transition time is determined by the capability of the terminal, the transmitter 1630 may transmit a capability value for setting the BWP transition time to the base station.

According to an embodiment, when the transmission time of the data channel according to the scheduling information is before the BWP switching time elapses based on the reception time of the downlink control information, the controller 1620 may maintain activation of the currently active bandwidth part. have.

That is, as shown in FIG. 12, a timing gap (eg, a k0 value) between the DCI reception time point indicated by the scheduling information included in the DCI and the data channel reception time point is indicated by the terminal. If the BWP switching time k-related capability cannot be guaranteed, the controller 1620 may not perform the BWP switching according to the DCI instruction. In this case, according to an example, the receiving unit 1610 may receive a data channel from a point in time when a k0 slot determined as scheduling information has elapsed while maintaining the previous bandwidth part.

In addition, according to an embodiment, when the transmission time of the data channel according to the scheduling information is before the BWP switching time elapses based on the reception time of the downlink control information, the control unit 1620 ) Can be activated. That is, as shown in FIG. 13, when a value k0, which is a timing gap between the DCI reception time point indicated by the scheduling information included in the DCI and the data channel reception time point, is earlier than the BWP switch time k indicated by the terminal, the controller The 1620 may not perform BWP switching according to the DCI instruction.

In this case, the controller 1620 may activate a preset default bandwidth part. According to an example, when the default bandwidth part is switched when k slots elapse, the transmitter 1630 may transmit information indicating that data channel reception is possible to the base station, or request DCI including new scheduling information for the data channel. have.

Alternatively, according to another example, the switching time kd to the default bandwidth part as the capability of the terminal may be set to be shorter than the general BWP switching time k. In this case, if kd is faster than k0, the controller 1620 may switch to the default bandwidth part when kd elapses after PDCCH reception, different from that illustrated in FIG. 13.

Further, according to an embodiment, when the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the initial bandwidth part set for initial access ( initial BWP) can be activated. That is, as shown in FIG. 14, when a value k0, which is a timing gap between the DCI reception time point indicated by the scheduling information included in the DCI and the data channel reception time point, is earlier than the BWP switch time k indicated by the terminal, the controller The 1620 may not perform BWP switching according to the DCI instruction.

In this case, the controller 1620 may activate the initial bandwidth part. According to an example, when the initial bandwidth part is switched when k slots elapse, the transmitter 1630 may transmit information indicating that data channel reception is possible to the base station, or request DCI including new scheduling information for the data channel. have.

Alternatively, according to another example, the switching time ki to the initial bandwidth part as the capability of the terminal may be set to be shorter than the general BWP switching time k. In this case, if ki is faster than k0, the controller 1620 may switch to the initial bandwidth part at a point in time when ki elapses after PDCCH reception, different from that shown in FIG. 14.

11 to 14 are shown in connection with transmission of a downlink data channel, but this can be applied substantially equally to transmission of an uplink data channel. That is, when UL BWP switching for the terminal is instructed through the UL grant DCI (UL grant DCI) including resource allocation information for the PUSCH, the control unit 1620 determines the slot in which the PDCCH including the DCI is received. Based on the UL BWP switching time of the terminal can be derived. The controller 1620 may deactivate the existing UL BWP from the slot j from the slot in which the PDCCH is received, and activate a new UL BWP indicated by the BIF included in the UL grant DCI. Here, the value j, which is the UL BWP switching time, may be determined by the capability of the terminal.

In addition, the control unit 1620 may be configured not to transmit PUCCH or PUSCH through the existing UL BWP during the DCI reception time including the BWP switching indication information and the BWP switching time according thereto. Alternatively, whether PUCCH or PUSCH can be transmitted through the existing BWP during the BWP switching time may be set by the base station through RRC signaling, MAC CE signaling, or L1 control signaling, or may be determined by terminal capacity.

In addition, when the BWP switching time is determined by the terminal capability, the timing gap between the DCI reception time indicated by the time domain resource assignment information indicated by the DCI and the PUSCH transmission time accordingly gap) (for example, the k2 value) does not guarantee the BWP switching time-related capability indicated by the terminal, the controller 1620 may not perform the BWP switching according to the DCI instruction.

In this case, as described with reference to FIGS. 12 to 14, the controller 1620 may maintain the existing activated bandwidth part, switch to a predetermined default bandwidth part, or switch to the initial bandwidth part. The transmitter 1630 may transmit a data channel for an uplink through an activated bandwidth part.

The controller 1620 may transmit and receive a data channel with the base station by activating a new bandwidth part indicated by a value of the bandwidth part indication field according to the above-described switching time. Accordingly, it is possible to efficiently switch the bandwidth part according to the capability of the terminal.

In the above, it has been described that the controller 1620 activates the newly indicated bandwidth part between the terminal and the base station and controls transmission and reception of the data channel, but the present invention is not limited thereto. According to an example, the controller 1620 may activate a newly indicated bandwidth part with another terminal and control transmission and reception of a data channel.

The standard contents or standard documents mentioned in the above-described embodiments are omitted to simplify the description of the specification and constitute a part of the specification. Accordingly, it should be construed as falling within the scope of the present invention to add the contents of the standard contents and some of the standard documents to the present specification or to describe in the claims.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (24)

In a method for a terminal to switch a bandwidth part to reduce power consumption when transmitting and receiving wireless data,
Transmitting physical layer capability information including bandwidth part (BWP) switching delay type information;
A bandwidth part indicator field indicating an activated bandwidth part and one other bandwidth part among one or more bandwidth parts included in a bandwidth part set configured in the terminal, and scheduling information for a data channel Receiving downlink control information including;
Activating a bandwidth part indicated according to a value of the bandwidth part indication field in consideration of a transition time determined according to the bandwidth part switching delay type information; And
Including the step of transmitting and receiving the data channel according to the scheduling information,
The bandwidth part indicated according to the value of the bandwidth part indication field is determined by reflecting the traffic load of the terminal,
The step of activating the bandwidth part indicated according to the value of the bandwidth part indication field,
When the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the activation of the activated bandwidth part is maintained. The method of claim 1,
The bandwidth part indicated according to the value of the bandwidth part indication field,
The method, characterized in that it is determined based on power consumption due to the traffic load when the terminal transmits and receives data in uplink and downlink. The method of claim 2,
The bandwidth part indicated according to the value of the bandwidth part indication field,
A method, characterized in that, among one or more bandwidth parts included in a bandwidth part set configured in the terminal, the bandwidth part having the least power consumption according to the traffic load is determined. In a method for a base station to switch a bandwidth part to reduce power consumption when transmitting and receiving wireless data,
Receiving physical layer capability information including bandwidth part switching delay type information from the terminal;
Determining a bandwidth part indication field indicating an activated bandwidth part and one other bandwidth part among one or more bandwidth parts included in a bandwidth part set configured in the terminal by reflecting the traffic load of the terminal;
Transmitting downlink control information including the bandwidth part indication field and scheduling information for a data channel to the terminal; And
When the bandwidth part indicated according to the value of the bandwidth part indication field is activated in consideration of the switching time determined according to the bandwidth part switching delay type information, transmitting and receiving the data channel according to the scheduling information,
Transmitting and receiving the data channel,
When the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the method of transmitting and receiving the data channel through a bandwidth part in which the activation is maintained. The method of claim 4,
The bandwidth part indicated according to the value of the bandwidth part indication field,
The method, characterized in that it is determined based on power consumption due to the traffic load when the terminal transmits and receives data in uplink and downlink. The method of claim 5,
The bandwidth part indicated according to the value of the bandwidth part indication field,
A method, characterized in that, among one or more bandwidth parts included in a bandwidth part set configured in the terminal, the bandwidth part having the least power consumption according to the traffic load is determined. In the method for the terminal to switch the bandwidth part,
Transmitting physical layer capability information including bandwidth part switching delay type information;
Receiving downlink control information including scheduling information for a data channel and a bandwidth part indication field indicating an activated bandwidth part and one other bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal step;
Activating a bandwidth part indicated according to a value of the bandwidth part indication field in consideration of a switching time determined according to the bandwidth part switching delay type information; And
Including the step of transmitting and receiving the data channel according to the scheduling information,
The step of activating the bandwidth part indicated according to the value of the bandwidth part indication field,
When the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the activation of the activated bandwidth part is maintained. The method of claim 7,
The bandwidth part indication field,
The method comprising the number of bits determined according to the number of bandwidth parts included in the bandwidth part set configured by bandwidth part setting information received through higher layer signaling. The method of claim 8,
The bandwidth part indication field,
When the number of bandwidth parts is N, log ₂ (N) bits or log ₂ (N+1) bits are determined. The method of claim 8,
The downlink control information,
A method, characterized in that it is determined whether to include the bandwidth part indication field according to a downlink control information format (DCI format). The method of claim 7,
The step of activating the bandwidth part indicated according to the value of the bandwidth part indication field,
When the transmission time of the data channel according to the scheduling information is after the switching time has elapsed based on the reception time of the downlink control information, a bandwidth part indicated according to a value of the bandwidth part indication field is activated. How to do it. delete In the method for the base station to switch the bandwidth part,
Receiving physical layer capability information including bandwidth part switching delay type information from the terminal;
Determining a bandwidth part indication field indicating any one bandwidth part different from the activated bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal;
Transmitting downlink control information including the bandwidth part indication field and scheduling information for a data channel to the terminal; And
When the bandwidth part indicated according to the value of the bandwidth part indication field is activated in consideration of the switching time determined according to the bandwidth part switching delay type information, transmitting and receiving the data channel according to the scheduling information,
Transmitting and receiving the data channel,
When the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the method of transmitting and receiving the data channel through a bandwidth part in which the activation is maintained. The method of claim 13,
The bandwidth part indication field,
A method comprising the number of bits determined according to the number of bandwidth parts included in the bandwidth part set configured by bandwidth part configuration information transmitted from the base station through higher layer signaling. The method of claim 14,
The bandwidth part indication field,
When the number of bandwidth parts is N, log ₂ (N) bits or log ₂ (N+1) bits are determined. The method of claim 13,
The downlink control information,
A method, characterized in that it is determined whether to include the bandwidth part indication field according to a downlink control information format (DCI format). The method of claim 13,
Transmitting and receiving the data channel,
When the transmission time of the data channel according to the scheduling information is after the switching time has elapsed based on the reception time of the downlink control information, when the bandwidth part indicated according to the value of the bandwidth part indication field is activated, the data A method comprising transmitting and receiving a channel. delete In the terminal to switch the bandwidth part,
A transmitter for transmitting physical layer capability information including bandwidth part switching delay type information;
Receiving downlink control information including scheduling information for a data channel and a bandwidth part indication field indicating an activated bandwidth part and one other bandwidth part among one or more bandwidth parts included in the bandwidth part set configured in the terminal Receiver; And
The transmission unit and the reception unit activate the bandwidth part indicated according to the value of the bandwidth part indication field in consideration of the switching time determined according to the bandwidth part switching delay type information, and transmit and receive the data channel according to the scheduling information. Including a control unit to control,
The control unit,
If the transmission time of the data channel according to the scheduling information is before the switching time elapses based on the reception time of the downlink control information, the terminal maintaining the activation of the activated bandwidth part. The method of claim 19,
The bandwidth part indication field,
A terminal comprising a number of bits determined according to the number of bandwidth parts included in the bandwidth part set configured by bandwidth part configuration information received through higher layer signaling. The method of claim 20,
The bandwidth part indication field,
When the number of bandwidth parts is N, the terminal, characterized in that it is determined as log ₂ (N) bits or log ₂ (N+1) bits. The method of claim 19,
The downlink control information,
A terminal, characterized in that it is determined whether to include the bandwidth part indication field according to a downlink control information format (DCI format). The method of claim 19,
The control unit,
When the transmission time of the data channel according to the scheduling information is after the switching time has elapsed based on the reception time of the downlink control information, the bandwidth part indicated according to the value of the bandwidth part indication field is activated. Terminal. delete

Images